Merge branch 'release-v1.52'

.ci/scripts/test_old_deps.sh

@@ -1,12 +1,14 @@
 #!/usr/bin/env bash
-
+# this script is run by GitHub Actions in a plain `focal` container; it installs the
-# this script is run by GitHub Actions in a plain `bionic` container; it installs the
 # minimal requirements for tox and hands over to the py3-old tox environment.
 
+# Prevent tzdata from asking for user input
+export DEBIAN_FRONTEND=noninteractive
+
 set -ex
 
 apt-get update
-apt-get install -y python3 python3-dev python3-pip libxml2-dev libxslt-dev xmlsec1 zlib1g-dev tox
+apt-get install -y python3 python3-dev python3-pip libxml2-dev libxslt-dev xmlsec1 zlib1g-dev tox libjpeg-dev libwebp-dev
 
 export LANG="C.UTF-8"
 

.github/workflows/docker.yml

@@ -34,6 +34,8 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+      # TODO: consider using https://github.com/docker/metadata-action instead of this
+      # custom magic
       - name: Calculate docker image tag
         id: set-tag
         run: |
@@ -53,18 +55,6 @@ jobs:
           esac
           echo "::set-output name=tag::$tag"
 
-        # for release builds, we want to get the amd64 image out asap, so first
-        # we do an amd64-only build, before following up with a multiarch build.
-      - name: Build and push amd64
-        uses: docker/build-push-action@v2
-        if: "${{ startsWith(github.ref, 'refs/tags/v') }}"
-        with:
-          push: true
-          labels: "gitsha1=${{ github.sha }}"
-          tags: "matrixdotorg/synapse:${{ steps.set-tag.outputs.tag }}"
-          file: "docker/Dockerfile"
-          platforms: linux/amd64
-
       - name: Build and push all platforms
         uses: docker/build-push-action@v2
         with:

.github/workflows/tests.yml

@@ -141,7 +141,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Test with old deps
-        uses: docker://ubuntu:bionic # For old python and sqlite
+        uses: docker://ubuntu:focal # For old python and sqlite
         with:
           workdir: /github/workspace
           entrypoint: .ci/scripts/test_old_deps.sh
@@ -213,15 +213,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - sytest-tag: bionic
+          - sytest-tag: focal
 
-          - sytest-tag: bionic
+          - sytest-tag: focal
             postgres: postgres
 
           - sytest-tag: testing
             postgres: postgres
 
-          - sytest-tag: bionic
+          - sytest-tag: focal
             postgres: multi-postgres
             workers: workers
 
@@ -323,17 +323,22 @@ jobs:
     if: ${{ !failure() && !cancelled() }}
     needs: linting-done
     runs-on: ubuntu-latest
-    container:
-      # https://github.com/matrix-org/complement/blob/master/dockerfiles/ComplementCIBuildkite.Dockerfile
-      image: matrixdotorg/complement:latest
-      env:
-        CI: true
-      ports:
-        - 8448:8448
-      volumes:
-        - /var/run/docker.sock:/var/run/docker.sock
 
     steps:
+      # The path is set via a file given by $GITHUB_PATH. We need both Go 1.17 and GOPATH on the path to run Complement.
+      # See https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path
+      - name: "Set Go Version"
+        run: |
+          # Add Go 1.17 to the PATH: see https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-Readme.md#environment-variables-2
+          echo "$GOROOT_1_17_X64/bin" >> $GITHUB_PATH
+          # Add the Go path to the PATH: We need this so we can call gotestfmt
+          echo "~/go/bin" >> $GITHUB_PATH
+
+      - name: "Install Complement Dependencies"
+        run: |
+          sudo apt-get update && sudo apt-get install -y libolm3 libolm-dev
+          go get -v github.com/haveyoudebuggedit/gotestfmt/v2/cmd/gotestfmt@latest
+
       - name: Run actions/checkout@v2 for synapse
         uses: actions/checkout@v2
         with:
@@ -376,8 +381,11 @@ jobs:
         working-directory: complement/dockerfiles
 
       # Run Complement
-      - run: set -o pipefail && go test -v -json -tags synapse_blacklist,msc2403 ./tests/... 2>&1 | gotestfmt
+      - run: |
+          set -o pipefail
+          go test -v -json -tags synapse_blacklist,msc2403 ./tests/... 2>&1 | gotestfmt
         shell: bash
+        name: Run Complement Tests
         env:
           COMPLEMENT_BASE_IMAGE: complement-synapse:latest
         working-directory: complement

.github/workflows/twisted_trunk.yml

@@ -25,7 +25,7 @@ jobs:
       - run: sudo apt-get -qq install xmlsec1
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.6
+          python-version: 3.7
       - run: .ci/patch_for_twisted_trunk.sh
       - run: pip install tox
       - run: tox -e py

CHANGES.md

@@ -1,3 +1,77 @@
+Synapse 1.52.0 (2022-02-08)
+===========================
+
+No significant changes since 1.52.0rc1.
+
+Note that [Twisted 22.1.0](https://github.com/twisted/twisted/releases/tag/twisted-22.1.0)
+has recently been released, which fixes a [security issue](https://github.com/twisted/twisted/security/advisories/GHSA-92x2-jw7w-xvvx)
+within the Twisted library. We do not believe Synapse is affected by this vulnerability,
+though we advise server administrators who installed Synapse via pip to upgrade Twisted
+with `pip install --upgrade Twisted` as a matter of good practice. The Docker image
+`matrixdotorg/synapse` and the Debian packages from `packages.matrix.org` are using the
+updated library.
+
+
+Synapse 1.52.0rc1 (2022-02-01)
+==============================
+
+Features
+--------
+
+- Remove account data (including client config, push rules and ignored users) upon user deactivation. ([\#11621](https://github.com/matrix-org/synapse/issues/11621), [\#11788](https://github.com/matrix-org/synapse/issues/11788), [\#11789](https://github.com/matrix-org/synapse/issues/11789))
+- Add an admin API to reset connection timeouts for remote server. ([\#11639](https://github.com/matrix-org/synapse/issues/11639))
+- Add an admin API to get a list of rooms that federate with a given remote homeserver. ([\#11658](https://github.com/matrix-org/synapse/issues/11658))
+- Add a config flag to inhibit `M_USER_IN_USE` during registration. ([\#11743](https://github.com/matrix-org/synapse/issues/11743))
+- Add a module callback to set username at registration. ([\#11790](https://github.com/matrix-org/synapse/issues/11790))
+- Allow configuring a maximum file size as well as a list of allowed content types for avatars. ([\#11846](https://github.com/matrix-org/synapse/issues/11846))
+
+
+Bugfixes
+--------
+
+- Include the bundled aggregations in the `/sync` response, per [MSC2675](https://github.com/matrix-org/matrix-doc/pull/2675). ([\#11612](https://github.com/matrix-org/synapse/issues/11612))
+- Fix a long-standing bug when previewing Reddit URLs which do not contain an image. ([\#11767](https://github.com/matrix-org/synapse/issues/11767))
+- Fix a long-standing bug that media streams could cause long-lived connections when generating URL previews. ([\#11784](https://github.com/matrix-org/synapse/issues/11784))
+- Include a `prev_content` field in state events sent to Application Services. Contributed by @totallynotvaishnav. ([\#11798](https://github.com/matrix-org/synapse/issues/11798))
+- Fix a bug introduced in Synapse 0.33.3 causing requests to sometimes log strings such as `HTTPStatus.OK` instead of integer status codes. ([\#11827](https://github.com/matrix-org/synapse/issues/11827))
+
+
+Improved Documentation
+----------------------
+
+- Update pypi installation docs to indicate that we now support Python 3.10. ([\#11820](https://github.com/matrix-org/synapse/issues/11820))
+- Add missing steps to the contribution submission process in the documentation.  Contributed by @sequentialread. ([\#11821](https://github.com/matrix-org/synapse/issues/11821))
+- Remove not needed old table of contents in documentation. ([\#11860](https://github.com/matrix-org/synapse/issues/11860))
+- Consolidate the `access_token` information at the top of each relevant page in the Admin API documentation. ([\#11861](https://github.com/matrix-org/synapse/issues/11861))
+
+
+Deprecations and Removals
+-------------------------
+
+- Drop support for Python 3.6, which is EOL. ([\#11683](https://github.com/matrix-org/synapse/issues/11683))
+- Remove the `experimental_msc1849_support_enabled` flag as the features are now stable. ([\#11843](https://github.com/matrix-org/synapse/issues/11843))
+
+
+Internal Changes
+----------------
+
+- Preparation for database schema simplifications: add `state_key` and `rejection_reason` columns to `events` table. ([\#11792](https://github.com/matrix-org/synapse/issues/11792))
+- Add `FrozenEvent.get_state_key` and use it in a couple of places. ([\#11793](https://github.com/matrix-org/synapse/issues/11793))
+- Preparation for database schema simplifications: stop reading from `event_reference_hashes`. ([\#11794](https://github.com/matrix-org/synapse/issues/11794))
+- Drop unused table `public_room_list_stream`. ([\#11795](https://github.com/matrix-org/synapse/issues/11795))
+- Preparation for reducing Postgres serialization errors: allow setting transaction isolation level. Contributed by Nick @ Beeper. ([\#11799](https://github.com/matrix-org/synapse/issues/11799), [\#11847](https://github.com/matrix-org/synapse/issues/11847))
+- Docker: skip the initial amd64-only build and go straight to multiarch. ([\#11810](https://github.com/matrix-org/synapse/issues/11810))
+- Run Complement on the Github Actions VM and not inside a Docker container. ([\#11811](https://github.com/matrix-org/synapse/issues/11811))
+- Log module names at startup. ([\#11813](https://github.com/matrix-org/synapse/issues/11813))
+- Improve type safety of bundled aggregations code. ([\#11815](https://github.com/matrix-org/synapse/issues/11815))
+- Correct a type annotation in the event validation logic. ([\#11817](https://github.com/matrix-org/synapse/issues/11817), [\#11830](https://github.com/matrix-org/synapse/issues/11830))
+- Minor updates and documentation for database schema delta files. ([\#11823](https://github.com/matrix-org/synapse/issues/11823))
+- Workaround a type annotation problem in `prometheus_client` 0.13.0. ([\#11834](https://github.com/matrix-org/synapse/issues/11834))
+- Minor performance improvement in room state lookup. ([\#11836](https://github.com/matrix-org/synapse/issues/11836))
+- Fix some indentation inconsistencies in the sample config. ([\#11838](https://github.com/matrix-org/synapse/issues/11838))
+- Add type hints to `tests/rest/admin`. ([\#11851](https://github.com/matrix-org/synapse/issues/11851))
+
+
 Synapse 1.51.0 (2022-01-25)
 ===========================
 

debian/changelog

@@ -1,3 +1,15 @@
+matrix-synapse-py3 (1.52.0) stable; urgency=medium
+
+  * New synapse release 1.52.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 08 Feb 2022 11:34:54 +0000
+
+matrix-synapse-py3 (1.52.0~rc1) stable; urgency=medium
+
+  * New synapse release 1.52.0~rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 01 Feb 2022 11:04:09 +0000
+
 matrix-synapse-py3 (1.51.0) stable; urgency=medium
 
   * New synapse release 1.51.0.

docker/Dockerfile-pgtests

@@ -1,6 +1,6 @@
 # Use the Sytest image that comes with a lot of the build dependencies
 # pre-installed
-FROM matrixdotorg/sytest:bionic
+FROM matrixdotorg/sytest:focal
 
 # The Sytest image doesn't come with python, so install that
 RUN apt-get update && apt-get -qq install -y python3 python3-dev python3-pip

docker/run_pg_tests.sh

@@ -16,4 +16,4 @@ sudo -u postgres /usr/lib/postgresql/10/bin/pg_ctl -w -D /var/lib/postgresql/dat
 # Run the tests
 cd /src
 export TRIAL_FLAGS="-j 4"
-tox --workdir=./.tox-pg-container -e py36-postgres "$@"
+tox --workdir=./.tox-pg-container -e py37-postgres "$@"

docs/MSC1711_certificates_FAQ.md

@@ -44,27 +44,6 @@ For more details and context on the release of the r0.1 Server/Server API and
 imminent Matrix 1.0 release, you can also see our
 [main talk from FOSDEM 2019](https://matrix.org/blog/2019/02/04/matrix-at-fosdem-2019/).
 
-## Contents
-* Timeline
-* Configuring certificates for compatibility with Synapse 1.0
-* FAQ
-  * Synapse 0.99.0 has just been released, what do I need to do right now?
-  * How do I upgrade?
-  * What will happen if I do not set up a valid federation certificate
-    immediately?
-  * What will happen if I do nothing at all?
-  * When do I need a SRV record or .well-known URI?
-  * Can I still use an SRV record?
-  * I have created a .well-known URI. Do I still need an SRV record?
-  * It used to work just fine, why are you breaking everything?
-  * Can I manage my own certificates rather than having Synapse renew
-    certificates itself?
-  * Do you still recommend against using a reverse proxy on the federation port?
-  * Do I still need to give my TLS certificates to Synapse if I am using a
-    reverse proxy?
-  * Do I need the same certificate for the client and federation port?
-  * How do I tell Synapse to reload my keys/certificates after I replace them?
-
 ## Timeline
 
 **5th Feb 2019  - Synapse 0.99.0 is released.**

docs/admin_api/account_validity.md

@@ -4,6 +4,9 @@ This API allows a server administrator to manage the validity of an account. To
 use it, you must enable the account validity feature (under
 `account_validity`) in Synapse's configuration.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 ## Renew account
 
 This API extends the validity of an account by as much time as configured in the

docs/admin_api/delete_group.md

@@ -4,11 +4,11 @@ This API lets a server admin delete a local group. Doing so will kick all
 users out of the group so that their clients will correctly handle the group
 being deleted.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 The API is:
 
 ```
 POST /_synapse/admin/v1/delete_group/<group_id>
 ```
-
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).

docs/admin_api/event_reports.md

@@ -2,12 +2,13 @@
 
 This API returns information about reported events.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 The api is:
 ```
 GET /_synapse/admin/v1/event_reports?from=0&limit=10
 ```
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).
 
 It returns a JSON body like the following:
 
@@ -94,8 +95,6 @@ The api is:
 ```
 GET /_synapse/admin/v1/event_reports/<report_id>
 ```
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).
 
 It returns a JSON body like the following:
 

docs/admin_api/media_admin_api.md

@@ -1,24 +1,10 @@
-# Contents
-- [Querying media](#querying-media)
-  * [List all media in a room](#list-all-media-in-a-room)
-  * [List all media uploaded by a user](#list-all-media-uploaded-by-a-user)
-- [Quarantine media](#quarantine-media)
-  * [Quarantining media by ID](#quarantining-media-by-id)
-  * [Remove media from quarantine by ID](#remove-media-from-quarantine-by-id)
-  * [Quarantining media in a room](#quarantining-media-in-a-room)
-  * [Quarantining all media of a user](#quarantining-all-media-of-a-user)
-  * [Protecting media from being quarantined](#protecting-media-from-being-quarantined)
-  * [Unprotecting media from being quarantined](#unprotecting-media-from-being-quarantined)
-- [Delete local media](#delete-local-media)
-  * [Delete a specific local media](#delete-a-specific-local-media)
-  * [Delete local media by date or size](#delete-local-media-by-date-or-size)
-  * [Delete media uploaded by a user](#delete-media-uploaded-by-a-user)
-- [Purge Remote Media API](#purge-remote-media-api)
-
 # Querying media
 
 These APIs allow extracting media information from the homeserver.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 ## List all media in a room
 
 This API gets a list of known media in a room.
@@ -28,8 +14,6 @@ The API is:
 ```
 GET /_synapse/admin/v1/room/<room_id>/media
 ```
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).
 
 The API returns a JSON body like the following:
 ```json
@@ -317,8 +301,5 @@ The following fields are returned in the JSON response body:
 
 * `deleted`: integer - The number of media items successfully deleted
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).
-
 If the user re-requests purged remote media, synapse will re-request the media
 from the originating server.

docs/admin_api/purge_history_api.md

@@ -10,15 +10,15 @@ paginate further back in the room from the point being purged from.
 Note that Synapse requires at least one message in each room, so it will never
 delete the last message in a room.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 The API is:
 
 ```
 POST /_synapse/admin/v1/purge_history/<room_id>[/<event_id>]
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 By default, events sent by local users are not deleted, as they may represent
 the only copies of this content in existence. (Events sent by remote users are
 deleted.)
@@ -57,9 +57,6 @@ It is possible to poll for updates on recent purges with a second API;
 GET /_synapse/admin/v1/purge_history_status/<purge_id>
 ```
 
-Again, you will need to authenticate by providing an `access_token` for a
-server admin.
-
 This API returns a JSON body like the following:
 
 ```json

docs/admin_api/room_membership.md

@@ -5,6 +5,9 @@ to a room with a given `room_id_or_alias`. You can only modify the membership of
 local users. The server administrator must be in the room and have permission to
 invite users.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 ## Parameters
 
 The following parameters are available:
@@ -23,9 +26,6 @@ POST /_synapse/admin/v1/join/<room_id_or_alias>
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: see [Admin API](../usage/administration/admin_api).
-
 Response:
 
 ```json

docs/admin_api/rooms.md

@@ -1,24 +1,12 @@
-# Contents
-- [List Room API](#list-room-api)
-- [Room Details API](#room-details-api)
-- [Room Members API](#room-members-api)
-- [Room State API](#room-state-api)
-- [Block Room API](#block-room-api)
-- [Delete Room API](#delete-room-api)
-  * [Version 1 (old version)](#version-1-old-version)
-  * [Version 2 (new version)](#version-2-new-version)
-  * [Status of deleting rooms](#status-of-deleting-rooms)
-  * [Undoing room shutdowns](#undoing-room-shutdowns)
-- [Make Room Admin API](#make-room-admin-api)
-- [Forward Extremities Admin API](#forward-extremities-admin-api)
-- [Event Context API](#event-context-api)
-
 # List Room API
 
 The List Room admin API allows server admins to get a list of rooms on their
 server. There are various parameters available that allow for filtering and
 sorting the returned list. This API supports pagination.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 **Parameters**
 
 The following query parameters are available:
@@ -493,9 +481,6 @@ several minutes or longer.
 The local server will only have the power to move local user and room aliases to
 the new room. Users on other servers will be unaffected.
 
-To use it, you will need to authenticate by providing an ``access_token`` for a
-server admin: see [Admin API](../usage/administration/admin_api).
-
 ## Version 1 (old version)
 
 This version works synchronously. That means you only get the response once the server has

docs/admin_api/statistics.md

@@ -3,15 +3,15 @@
 Returns information about all local media usage of users. Gives the
 possibility to filter them by time and user.
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 The API is:
 
 ```
 GET /_synapse/admin/v1/statistics/users/media
 ```
 
-To use it, you will need to authenticate by providing an `access_token`
-for a server admin: see [Admin API](../usage/administration/admin_api).
-
 A response body like the following is returned:
 
 ```json

docs/admin_api/user_admin_api.md

@@ -1,5 +1,8 @@
 # User Admin API
 
+To use it, you will need to authenticate by providing an `access_token`
+for a server admin: see [Admin API](../usage/administration/admin_api).
+
 ## Query User Account
 
 This API returns information about a specific user account.
@@ -10,9 +13,6 @@ The api is:
 GET /_synapse/admin/v2/users/<user_id>
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 It returns a JSON body like the following:
 
 ```jsonc
@@ -104,9 +104,6 @@ with a body of:
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 Returns HTTP status code:
 - `201` - When a new user object was created.
 - `200` - When a user was modified.
@@ -156,9 +153,6 @@ By default, the response is ordered by ascending user ID.
 GET /_synapse/admin/v2/users?from=0&limit=10&guests=false
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -278,9 +272,6 @@ GET /_matrix/client/r0/admin/whois/<userId>
 See also: [Client Server
 API Whois](https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-admin-whois-userid).
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 It returns a JSON body like the following:
 
 ```json
@@ -335,9 +326,6 @@ with a body of:
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 The erase parameter is optional and defaults to `false`.
 An empty body may be passed for backwards compatibility.
 
@@ -353,6 +341,11 @@ The following actions are performed when deactivating an user:
 - Remove the user from the user directory
 - Reject all pending invites
 - Remove all account validity information related to the user
+- Remove the arbitrary data store known as *account data*. For example, this includes:
+    - list of ignored users;
+    - push rules;
+    - secret storage keys; and
+    - cross-signing keys.
 
 The following additional actions are performed during deactivation if `erase`
 is set to `true`:
@@ -366,7 +359,6 @@ The following actions are **NOT** performed. The list may be incomplete.
 - Remove mappings of SSO IDs
 - [Delete media uploaded](#delete-media-uploaded-by-a-user) by user (included avatar images)
 - Delete sent and received messages
-- Delete E2E cross-signing keys
 - Remove the user's creation (registration) timestamp
 - [Remove rate limit overrides](#override-ratelimiting-for-users)
 - Remove from monthly active users
@@ -390,9 +382,6 @@ with a body of:
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 The parameter `new_password` is required.
 The parameter `logout_devices` is optional and defaults to `true`.
 
@@ -405,9 +394,6 @@ The api is:
 GET /_synapse/admin/v1/users/<user_id>/admin
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -435,10 +421,6 @@ with a body of:
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
-
 ## List room memberships of a user
 
 Gets a list of all `room_id` that a specific `user_id` is member.
@@ -449,9 +431,6 @@ The API is:
 GET /_synapse/admin/v1/users/<user_id>/joined_rooms
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -570,9 +549,6 @@ The API is:
 GET /_synapse/admin/v1/users/<user_id>/media
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -687,9 +663,6 @@ The API is:
 DELETE /_synapse/admin/v1/users/<user_id>/media
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -762,9 +735,6 @@ The API is:
 GET /_synapse/admin/v2/users/<user_id>/devices
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -830,9 +800,6 @@ POST /_synapse/admin/v2/users/<user_id>/delete_devices
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 An empty JSON dict is returned.
 
 **Parameters**
@@ -854,9 +821,6 @@ The API is:
 GET /_synapse/admin/v2/users/<user_id>/devices/<device_id>
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -902,9 +866,6 @@ PUT /_synapse/admin/v2/users/<user_id>/devices/<device_id>
 }
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 An empty JSON dict is returned.
 
 **Parameters**
@@ -931,9 +892,6 @@ DELETE /_synapse/admin/v2/users/<user_id>/devices/<device_id>
 {}
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 An empty JSON dict is returned.
 
 **Parameters**
@@ -952,9 +910,6 @@ The API is:
 GET /_synapse/admin/v1/users/<user_id>/pushers
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -1049,9 +1004,6 @@ To un-shadow-ban a user the API is:
 DELETE /_synapse/admin/v1/users/<user_id>/shadow_ban
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 An empty JSON dict is returned in both cases.
 
 **Parameters**
@@ -1074,9 +1026,6 @@ The API is:
 GET /_synapse/admin/v1/users/<user_id>/override_ratelimit
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -1116,9 +1065,6 @@ The API is:
 POST /_synapse/admin/v1/users/<user_id>/override_ratelimit
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 A response body like the following is returned:
 
 ```json
@@ -1161,9 +1107,6 @@ The API is:
 DELETE /_synapse/admin/v1/users/<user_id>/override_ratelimit
 ```
 
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)
-
 An empty JSON dict is returned.
 
 ```json
@@ -1192,7 +1135,5 @@ The API is:
 GET /_synapse/admin/v1/username_available?username=$localpart
 ```
 
-The request and response format is the same as the [/_matrix/client/r0/register/available](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-register-available) API.
+The request and response format is the same as the
-
+[/_matrix/client/r0/register/available](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-register-available) API.
-To use it, you will need to authenticate by providing an `access_token` for a
-server admin: [Admin API](../usage/administration/admin_api)

docs/admin_api/version_api.md

@@ -16,6 +16,6 @@ It returns a JSON body like the following:
 ```json
 {
     "server_version": "0.99.2rc1 (b=develop, abcdef123)",
-    "python_version": "3.6.8"
+    "python_version": "3.7.8"
 }
 ```

docs/development/contributing_guide.md

@@ -55,6 +55,7 @@ setup a *virtualenv*, as follows:
 cd path/where/you/have/cloned/the/repository
 python3 -m venv ./env
 source ./env/bin/activate
+pip install wheel
 pip install -e ".[all,dev]"
 pip install tox
 ```
@@ -116,7 +117,7 @@ The linters look at your code and do two things:
 - ensure that your code follows the coding style adopted by the project;
 - catch a number of errors in your code.
 
-They're pretty fast, don't hesitate!
+The linter takes no time at all to run as soon as you've [downloaded the dependencies into your python virtual environment](#4-install-the-dependencies).
 
 ```sh
 source ./env/bin/activate

docs/development/database_schema.md

@@ -96,6 +96,60 @@ Ensure postgres is installed, then run:
 NB at the time of writing, this script predates the split into separate `state`/`main`
 databases so will require updates to handle that correctly.
 
+## Delta files
+
+Delta files define the steps required to upgrade the database from an earlier version.
+They can be written as either a file containing a series of SQL statements, or a Python
+module.
+
+Synapse remembers which delta files it has applied to a database (they are stored in the
+`applied_schema_deltas` table) and will not re-apply them (even if a given file is
+subsequently updated).
+
+Delta files should be placed in a directory named `synapse/storage/schema/<database>/delta/<version>/`.
+They are applied in alphanumeric order, so  by convention the first two characters
+of the filename should be an integer such as `01`, to put the file in the right order.
+
+### SQL delta files
+
+These should be named `*.sql`, or —  for changes which should only be applied for a
+given database engine — `*.sql.posgres` or `*.sql.sqlite`. For example, a delta which
+adds a new column to the `foo` table might be called `01add_bar_to_foo.sql`.
+
+Note that our SQL parser is a bit simple - it understands comments (`--` and `/*...*/`),
+but complex statements which require a `;` in the middle of them (such as `CREATE
+TRIGGER`) are beyond it and you'll have to use a Python delta file.
+
+### Python delta files
+
+For more flexibility, a delta file can take the form of a python module. These should
+be named `*.py`. Note that database-engine-specific modules are not supported here –
+instead you can write `if isinstance(database_engine, PostgresEngine)` or similar.
+
+A Python delta module should define either or both of the following functions:
+
+```python
+import synapse.config.homeserver
+import synapse.storage.engines
+import synapse.storage.types
+
+
+def run_create(
+    cur: synapse.storage.types.Cursor,
+    database_engine: synapse.storage.engines.BaseDatabaseEngine,
+) -> None:
+    """Called whenever an existing or new database is to be upgraded"""
+    ...
+
+def run_upgrade(
+    cur: synapse.storage.types.Cursor,
+    database_engine: synapse.storage.engines.BaseDatabaseEngine,
+    config: synapse.config.homeserver.HomeServerConfig,
+) -> None:
+    """Called whenever an existing database is to be upgraded."""
+    ...
+```
+
 ## Boolean columns
 
 Boolean columns require special treatment, since SQLite treats booleans the

docs/modules/password_auth_provider_callbacks.md

@@ -105,6 +105,68 @@ device ID), and the (now deactivated) access token.
 
 If multiple modules implement this callback, Synapse runs them all in order.
 
+### `get_username_for_registration`
+
+_First introduced in Synapse v1.52.0_
+
+```python
+async def get_username_for_registration(
+    uia_results: Dict[str, Any],
+    params: Dict[str, Any],
+) -> Optional[str]
+```
+
+Called when registering a new user. The module can return a username to set for the user
+being registered by returning it as a string, or `None` if it doesn't wish to force a
+username for this user. If a username is returned, it will be used as the local part of a
+user's full Matrix ID (e.g. it's `alice` in `@alice:example.com`).
+
+This callback is called once [User-Interactive Authentication](https://spec.matrix.org/latest/client-server-api/#user-interactive-authentication-api)
+has been completed by the user. It is not called when registering a user via SSO. It is
+passed two dictionaries, which include the information that the user has provided during
+the registration process.
+
+The first dictionary contains the results of the [User-Interactive Authentication](https://spec.matrix.org/latest/client-server-api/#user-interactive-authentication-api)
+flow followed by the user. Its keys are the identifiers of every step involved in the flow,
+associated with either a boolean value indicating whether the step was correctly completed,
+or additional information (e.g. email address, phone number...). A list of most existing
+identifiers can be found in the [Matrix specification](https://spec.matrix.org/v1.1/client-server-api/#authentication-types).
+Here's an example featuring all currently supported keys:
+
+```python
+{
+    "m.login.dummy": True,  # Dummy authentication
+    "m.login.terms": True,  # User has accepted the terms of service for the homeserver
+    "m.login.recaptcha": True,  # User has completed the recaptcha challenge
+    "m.login.email.identity": {  # User has provided and verified an email address
+        "medium": "email",
+        "address": "alice@example.com",
+        "validated_at": 1642701357084,
+    },
+    "m.login.msisdn": {  # User has provided and verified a phone number
+        "medium": "msisdn",
+        "address": "33123456789",
+        "validated_at": 1642701357084,
+    },
+    "org.matrix.msc3231.login.registration_token": "sometoken",  # User has registered through the flow described in MSC3231
+}
+```
+
+The second dictionary contains the parameters provided by the user's client in the request
+to `/_matrix/client/v3/register`. See the [Matrix specification](https://spec.matrix.org/latest/client-server-api/#post_matrixclientv3register)
+for a complete list of these parameters.
+
+If the module cannot, or does not wish to, generate a username for this user, it must
+return `None`.
+
+If multiple modules implement this callback, they will be considered in order. If a
+callback returns `None`, Synapse falls through to the next one. The value of the first
+callback that does not return `None` will be used. If this happens, Synapse will not call
+any of the subsequent implementations of this callback. If every callback return `None`,
+the username provided by the user is used, if any (otherwise one is automatically
+generated).
+
+
 ## Example
 
 The example module below implements authentication checkers for two different login types: 

docs/sample_config.yaml

@@ -41,11 +41,11 @@
 # documentation on how to configure or create custom modules for Synapse.
 #
 modules:
-    # - module: my_super_module.MySuperClass
+  #- module: my_super_module.MySuperClass
-    #   config:
+  #  config:
-    #       do_thing: true
+  #    do_thing: true
-    # - module: my_other_super_module.SomeClass
+  #- module: my_other_super_module.SomeClass
-    #   config: {}
+  #  config: {}
 
 
 ## Server ##
@@ -471,6 +471,20 @@ limit_remote_rooms:
 #
 #allow_per_room_profiles: false
 
+# The largest allowed file size for a user avatar. Defaults to no restriction.
+#
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
+#
+#max_avatar_size: 10M
+
+# The MIME types allowed for user avatars. Defaults to no restriction.
+#
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
+#
+#allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
+
 # How long to keep redacted events in unredacted form in the database. After
 # this period redacted events get replaced with their redacted form in the DB.
 #
@@ -1428,6 +1442,16 @@ account_threepid_delegates:
 #
 #auto_join_rooms_for_guests: false
 
+# Whether to inhibit errors raised when registering a new account if the user ID
+# already exists. If turned on, that requests to /register/available will always
+# show a user ID as available, and Synapse won't raise an error when starting
+# a registration with a user ID that already exists. However, Synapse will still
+# raise an error if the registration completes and the username conflicts.
+#
+# Defaults to false.
+#
+#inhibit_user_in_use_error: true
+
 
 ## Metrics ###
 

docs/setup/installation.md

@@ -194,7 +194,7 @@ When following this route please make sure that the [Platform-specific prerequis
 System requirements:
 
 - POSIX-compliant system (tested on Linux & OS X)
-- Python 3.7 or later, up to Python 3.9.
+- Python 3.7 or later, up to Python 3.10.
 - At least 1GB of free RAM if you want to join large public rooms like #matrix:matrix.org
 
 To install the Synapse homeserver run:

docs/upgrade.md

@@ -85,6 +85,18 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.52.0
+
+## Twisted security release
+
+Note that [Twisted 22.1.0](https://github.com/twisted/twisted/releases/tag/twisted-22.1.0)
+has recently been released, which fixes a [security issue](https://github.com/twisted/twisted/security/advisories/GHSA-92x2-jw7w-xvvx)
+within the Twisted library. We do not believe Synapse is affected by this vulnerability,
+though we advise server administrators who installed Synapse via pip to upgrade Twisted
+with `pip install --upgrade Twisted` as a matter of good practice. The Docker image
+`matrixdotorg/synapse` and the Debian packages from `packages.matrix.org` are using the
+updated library.
+
 # Upgrading to v1.51.0
 
 ## Deprecation of `webclient` listeners and non-HTTP(S) `web_client_location`

docs/usage/administration/admin_api/federation.md

@@ -86,7 +86,7 @@ The following fields are returned in the JSON response body:
 - `next_token`: string representing a positive integer - Indication for pagination. See above.
 - `total` - integer - Total number of destinations.
 
-# Destination Details API
+## Destination Details API
 
 This API gets the retry timing info for a specific remote server.
 
@@ -108,7 +108,105 @@ A response body like the following is returned:
 }
 ```
 
+**Parameters**
+
+The following parameters should be set in the URL:
+
+- `destination` - Name of the remote server.
+
 **Response**
 
 The response fields are the same like in the `destinations` array in
 [List of destinations](#list-of-destinations) response.
+
+## Destination rooms
+
+This API gets the rooms that federate with a specific remote server.
+
+The API is:
+
+```
+GET /_synapse/admin/v1/federation/destinations/<destination>/rooms
+```
+
+A response body like the following is returned:
+
+```json
+{
+   "rooms":[
+      {
+         "room_id": "!OGEhHVWSdvArJzumhm:matrix.org",
+         "stream_ordering": 8326
+      },
+      {
+         "room_id": "!xYvNcQPhnkrdUmYczI:matrix.org",
+         "stream_ordering": 93534
+      }
+   ],
+   "total": 2
+}
+```
+
+To paginate, check for `next_token` and if present, call the endpoint again
+with `from` set to the value of `next_token`. This will return a new page.
+
+If the endpoint does not return a `next_token` then there are no more destinations
+to paginate through.
+
+**Parameters**
+
+The following parameters should be set in the URL:
+
+- `destination` - Name of the remote server.
+
+The following query parameters are available:
+
+- `from` - Offset in the returned list. Defaults to `0`.
+- `limit` - Maximum amount of destinations to return. Defaults to `100`.
+- `dir` - Direction of room order by `room_id`. Either `f` for forwards or `b` for
+  backwards. Defaults to `f`.
+
+**Response**
+
+The following fields are returned in the JSON response body:
+
+- `rooms` - An array of objects, each containing information about a room.
+  Room objects contain the following fields:
+  - `room_id` - string - The ID of the room.
+  - `stream_ordering` - integer -  The stream ordering of the most recent
+    successfully-sent [PDU](understanding_synapse_through_grafana_graphs.md#federation)
+    to this destination in this room.
+- `next_token`: string representing a positive integer - Indication for pagination. See above.
+- `total` - integer - Total number of destinations.
+
+## Reset connection timeout
+
+Synapse makes federation requests to other homeservers. If a federation request fails,
+Synapse will mark the destination homeserver as offline, preventing any future requests
+to that server for a "cooldown" period. This period grows over time if the server
+continues to fail its responses
+([exponential backoff](https://en.wikipedia.org/wiki/Exponential_backoff)).
+
+Admins can cancel the cooldown period with this API.
+
+This API resets the retry timing for a specific remote server and tries to connect to
+the remote server again. It does not wait for the next `retry_interval`.
+The connection must have previously run into an error and `retry_last_ts`
+([Destination Details API](#destination-details-api)) must not be equal to `0`.
+
+The connection attempt is carried out in the background and can take a while
+even if the API already returns the http status 200.
+
+The API is:
+
+```
+POST /_synapse/admin/v1/federation/destinations/<destination>/reset_connection
+
+{}
+```
+
+**Parameters**
+
+The following parameters should be set in the URL:
+
+- `destination` - Name of the remote server.

mypy.ini

@@ -77,9 +77,6 @@ exclude = (?x)
    |tests/push/test_http.py
    |tests/push/test_presentable_names.py
    |tests/push/test_push_rule_evaluator.py
-   |tests/rest/admin/test_admin.py
-   |tests/rest/admin/test_user.py
-   |tests/rest/admin/test_username_available.py
    |tests/rest/client/test_account.py
    |tests/rest/client/test_events.py
    |tests/rest/client/test_filter.py

setup.py

@@ -150,7 +150,7 @@ setup(
     zip_safe=False,
     long_description=long_description,
     long_description_content_type="text/x-rst",
-    python_requires="~=3.6",
+    python_requires="~=3.7",
     entry_points={
         "console_scripts": [
             "synapse_homeserver = synapse.app.homeserver:main",

synapse/__init__.py

@@ -21,8 +21,8 @@ import os
 import sys
 
 # Check that we're not running on an unsupported Python version.
-if sys.version_info < (3, 6):
+if sys.version_info < (3, 7):
-    print("Synapse requires Python 3.6 or above.")
+    print("Synapse requires Python 3.7 or above.")
     sys.exit(1)
 
 # Twisted and canonicaljson will fail to import when this file is executed to
@@ -47,7 +47,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.51.0"
+__version__ = "1.52.0"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when

synapse/app/_base.py

@@ -16,7 +16,6 @@ import atexit
 import gc
 import logging
 import os
-import platform
 import signal
 import socket
 import sys
@@ -436,7 +435,8 @@ async def start(hs: "HomeServer") -> None:
     # before we start the listeners.
     module_api = hs.get_module_api()
     for module, config in hs.config.modules.loaded_modules:
-        module(config=config, api=module_api)
+        m = module(config=config, api=module_api)
+        logger.info("Loaded module %s", m)
 
     load_legacy_spam_checkers(hs)
     load_legacy_third_party_event_rules(hs)
@@ -468,15 +468,13 @@ async def start(hs: "HomeServer") -> None:
     # everything currently allocated are things that will be used for the
     # rest of time. Doing so means less work each GC (hopefully).
     #
-    # This only works on Python 3.7
+    # PyPy does not (yet?) implement gc.freeze()
-    if platform.python_implementation() == "CPython" and sys.version_info >= (3, 7):
+    if hasattr(gc, "freeze"):
         gc.collect()
         gc.freeze()
 
-    # Speed up shutdowns by freezing all allocated objects. This moves everything
+        # Speed up shutdowns by freezing all allocated objects. This moves everything
-    # into the permanent generation and excludes them from the final GC.
+        # into the permanent generation and excludes them from the final GC.
-    # Unfortunately only works on Python 3.7
-    if platform.python_implementation() == "CPython" and sys.version_info >= (3, 7):
         atexit.register(gc.freeze)
 
 

synapse/config/experimental.py

@@ -24,8 +24,6 @@ class ExperimentalConfig(Config):
     def read_config(self, config: JsonDict, **kwargs):
         experimental = config.get("experimental_features") or {}
 
-        # Whether to enable experimental MSC1849 (aka relations) support
-        self.msc1849_enabled = config.get("experimental_msc1849_support_enabled", True)
         # MSC3440 (thread relation)
         self.msc3440_enabled: bool = experimental.get("msc3440_enabled", False)
 

synapse/config/modules.py

@@ -41,9 +41,9 @@ class ModulesConfig(Config):
             # documentation on how to configure or create custom modules for Synapse.
             #
             modules:
-                # - module: my_super_module.MySuperClass
+              #- module: my_super_module.MySuperClass
-                #   config:
+              #  config:
-                #       do_thing: true
+              #    do_thing: true
-                # - module: my_other_super_module.SomeClass
+              #- module: my_other_super_module.SomeClass
-                #   config: {}
+              #  config: {}
             """

synapse/config/registration.py

@@ -190,6 +190,8 @@ class RegistrationConfig(Config):
         # The success template used during fallback auth.
         self.fallback_success_template = self.read_template("auth_success.html")
 
+        self.inhibit_user_in_use_error = config.get("inhibit_user_in_use_error", False)
+
     def generate_config_section(self, generate_secrets=False, **kwargs):
         if generate_secrets:
             registration_shared_secret = 'registration_shared_secret: "%s"' % (
@@ -446,6 +448,16 @@ class RegistrationConfig(Config):
         # Defaults to true.
         #
         #auto_join_rooms_for_guests: false
+
+        # Whether to inhibit errors raised when registering a new account if the user ID
+        # already exists. If turned on, that requests to /register/available will always
+        # show a user ID as available, and Synapse won't raise an error when starting
+        # a registration with a user ID that already exists. However, Synapse will still
+        # raise an error if the registration completes and the username conflicts.
+        #
+        # Defaults to false.
+        #
+        #inhibit_user_in_use_error: true
         """
             % locals()
         )

synapse/config/server.py

@@ -489,6 +489,19 @@ class ServerConfig(Config):
         # events with profile information that differ from the target's global profile.
         self.allow_per_room_profiles = config.get("allow_per_room_profiles", True)
 
+        # The maximum size an avatar can have, in bytes.
+        self.max_avatar_size = config.get("max_avatar_size")
+        if self.max_avatar_size is not None:
+            self.max_avatar_size = self.parse_size(self.max_avatar_size)
+
+        # The MIME types allowed for an avatar.
+        self.allowed_avatar_mimetypes = config.get("allowed_avatar_mimetypes")
+        if self.allowed_avatar_mimetypes and not isinstance(
+            self.allowed_avatar_mimetypes,
+            list,
+        ):
+            raise ConfigError("allowed_avatar_mimetypes must be a list")
+
         self.listeners = [parse_listener_def(x) for x in config.get("listeners", [])]
 
         # no_tls is not really supported any more, but let's grandfather it in
@@ -1168,6 +1181,20 @@ class ServerConfig(Config):
         #
         #allow_per_room_profiles: false
 
+        # The largest allowed file size for a user avatar. Defaults to no restriction.
+        #
+        # Note that user avatar changes will not work if this is set without
+        # using Synapse's media repository.
+        #
+        #max_avatar_size: 10M
+
+        # The MIME types allowed for user avatars. Defaults to no restriction.
+        #
+        # Note that user avatar changes will not work if this is set without
+        # using Synapse's media repository.
+        #
+        #allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
+
         # How long to keep redacted events in unredacted form in the database. After
         # this period redacted events get replaced with their redacted form in the DB.
         #

synapse/events/__init__.py

@@ -315,10 +315,11 @@ class EventBase(metaclass=abc.ABCMeta):
     redacts: DefaultDictProperty[Optional[str]] = DefaultDictProperty("redacts", None)
     room_id: DictProperty[str] = DictProperty("room_id")
     sender: DictProperty[str] = DictProperty("sender")
-    # TODO state_key should be Optional[str], this is generally asserted in Synapse
+    # TODO state_key should be Optional[str]. This is generally asserted in Synapse
-    # by calling is_state() first (which ensures this), but it is hard (not possible?)
+    # by calling is_state() first (which ensures it is not None), but it is hard (not possible?)
     # to properly annotate that calling is_state() asserts that state_key exists
-    # and is non-None.
+    # and is non-None. It would be better to replace such direct references with
+    # get_state_key() (and a check for None).
     state_key: DictProperty[str] = DictProperty("state_key")
     type: DictProperty[str] = DictProperty("type")
     user_id: DictProperty[str] = DictProperty("sender")
@@ -332,7 +333,11 @@ class EventBase(metaclass=abc.ABCMeta):
         return self.content["membership"]
 
     def is_state(self) -> bool:
-        return hasattr(self, "state_key") and self.state_key is not None
+        return self.get_state_key() is not None
+
+    def get_state_key(self) -> Optional[str]:
+        """Get the state key of this event, or None if it's not a state event"""
+        return self._dict.get("state_key")
 
     def get_dict(self) -> JsonDict:
         d = dict(self._dict)

synapse/events/snapshot.py

@@ -163,7 +163,7 @@ class EventContext:
         return {
             "prev_state_id": prev_state_id,
             "event_type": event.type,
-            "event_state_key": event.state_key if event.is_state() else None,
+            "event_state_key": event.get_state_key(),
             "state_group": self._state_group,
             "state_group_before_event": self.state_group_before_event,
             "rejected": self.rejected,

synapse/events/utils.py

@@ -14,7 +14,17 @@
 # limitations under the License.
 import collections.abc
 import re
-from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Union
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Dict,
+    Iterable,
+    List,
+    Mapping,
+    Optional,
+    Union,
+)
 
 from frozendict import frozendict
 
@@ -26,6 +36,10 @@ from synapse.util.frozenutils import unfreeze
 
 from . import EventBase
 
+if TYPE_CHECKING:
+    from synapse.storage.databases.main.relations import BundledAggregations
+
+
 # Split strings on "." but not "\." This uses a negative lookbehind assertion for '\'
 # (?<!stuff) matches if the current position in the string is not preceded
 # by a match for 'stuff'.
@@ -376,7 +390,7 @@ class EventClientSerializer:
         event: Union[JsonDict, EventBase],
         time_now: int,
         *,
-        bundle_aggregations: Optional[Dict[str, JsonDict]] = None,
+        bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
         **kwargs: Any,
     ) -> JsonDict:
         """Serializes a single event.
@@ -415,7 +429,7 @@ class EventClientSerializer:
         self,
         event: EventBase,
         time_now: int,
-        aggregations: JsonDict,
+        aggregations: "BundledAggregations",
         serialized_event: JsonDict,
     ) -> None:
         """Potentially injects bundled aggregations into the unsigned portion of the serialized event.
@@ -427,13 +441,18 @@ class EventClientSerializer:
             serialized_event: The serialized event which may be modified.
 
         """
-        # Make a copy in-case the object is cached.
+        serialized_aggregations = {}
-        aggregations = aggregations.copy()
 
-        if RelationTypes.REPLACE in aggregations:
+        if aggregations.annotations:
+            serialized_aggregations[RelationTypes.ANNOTATION] = aggregations.annotations
+
+        if aggregations.references:
+            serialized_aggregations[RelationTypes.REFERENCE] = aggregations.references
+
+        if aggregations.replace:
             # If there is an edit replace the content, preserving existing
             # relations.
-            edit = aggregations[RelationTypes.REPLACE]
+            edit = aggregations.replace
 
             # Ensure we take copies of the edit content, otherwise we risk modifying
             # the original event.
@@ -451,24 +470,28 @@ class EventClientSerializer:
             else:
                 serialized_event["content"].pop("m.relates_to", None)
 
-            aggregations[RelationTypes.REPLACE] = {
+            serialized_aggregations[RelationTypes.REPLACE] = {
                 "event_id": edit.event_id,
                 "origin_server_ts": edit.origin_server_ts,
                 "sender": edit.sender,
             }
 
         # If this event is the start of a thread, include a summary of the replies.
-        if RelationTypes.THREAD in aggregations:
+        if aggregations.thread:
-            # Serialize the latest thread event.
+            serialized_aggregations[RelationTypes.THREAD] = {
-            latest_thread_event = aggregations[RelationTypes.THREAD]["latest_event"]
+                # Don't bundle aggregations as this could recurse forever.
-
+                "latest_event": self.serialize_event(
-            # Don't bundle aggregations as this could recurse forever.
+                    aggregations.thread.latest_event, time_now, bundle_aggregations=None
-            aggregations[RelationTypes.THREAD]["latest_event"] = self.serialize_event(
+                ),
-                latest_thread_event, time_now, bundle_aggregations=None
+                "count": aggregations.thread.count,
-            )
+                "current_user_participated": aggregations.thread.current_user_participated,
+            }
 
         # Include the bundled aggregations in the event.
-        serialized_event["unsigned"].setdefault("m.relations", {}).update(aggregations)
+        if serialized_aggregations:
+            serialized_event["unsigned"].setdefault("m.relations", {}).update(
+                serialized_aggregations
+            )
 
     def serialize_events(
         self, events: Iterable[Union[JsonDict, EventBase]], time_now: int, **kwargs: Any

synapse/events/validator.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import collections.abc
-from typing import Iterable, Union
+from typing import Iterable, Type, Union
 
 import jsonschema
 
@@ -246,7 +246,7 @@ POWER_LEVELS_SCHEMA = {
 
 # This could return something newer than Draft 7, but that's the current "latest"
 # validator.
-def _create_power_level_validator() -> jsonschema.Draft7Validator:
+def _create_power_level_validator() -> Type[jsonschema.Draft7Validator]:
     validator = jsonschema.validators.validator_for(POWER_LEVELS_SCHEMA)
 
     # by default jsonschema does not consider a frozendict to be an object so

synapse/federation/transport/server/__init__.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-from typing import Dict, Iterable, List, Optional, Tuple, Type
+from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Type
 
 from typing_extensions import Literal
 
@@ -36,17 +36,19 @@ from synapse.http.servlet import (
     parse_integer_from_args,
     parse_string_from_args,
 )
-from synapse.server import HomeServer
 from synapse.types import JsonDict, ThirdPartyInstanceID
 from synapse.util.ratelimitutils import FederationRateLimiter
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 logger = logging.getLogger(__name__)
 
 
 class TransportLayerServer(JsonResource):
     """Handles incoming federation HTTP requests"""
 
-    def __init__(self, hs: HomeServer, servlet_groups: Optional[List[str]] = None):
+    def __init__(self, hs: "HomeServer", servlet_groups: Optional[List[str]] = None):
         """Initialize the TransportLayerServer
 
         Will by default register all servlets. For custom behaviour, pass in
@@ -113,7 +115,7 @@ class PublicRoomList(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -203,7 +205,7 @@ class FederationGroupsRenewAttestaionServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -251,7 +253,7 @@ class OpenIdUserInfo(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -297,7 +299,7 @@ DEFAULT_SERVLET_GROUPS: Dict[str, Iterable[Type[BaseFederationServlet]]] = {
 
 
 def register_servlets(
-    hs: HomeServer,
+    hs: "HomeServer",
     resource: HttpServer,
     authenticator: Authenticator,
     ratelimiter: FederationRateLimiter,

synapse/federation/transport/server/_base.py

@@ -15,7 +15,7 @@
 import functools
 import logging
 import re
-from typing import Any, Awaitable, Callable, Optional, Tuple, cast
+from typing import TYPE_CHECKING, Any, Awaitable, Callable, Optional, Tuple, cast
 
 from synapse.api.errors import Codes, FederationDeniedError, SynapseError
 from synapse.api.urls import FEDERATION_V1_PREFIX
@@ -29,11 +29,13 @@ from synapse.logging.opentracing import (
     start_active_span_follows_from,
     whitelisted_homeserver,
 )
-from synapse.server import HomeServer
 from synapse.types import JsonDict
 from synapse.util.ratelimitutils import FederationRateLimiter
 from synapse.util.stringutils import parse_and_validate_server_name
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 logger = logging.getLogger(__name__)
 
 
@@ -46,7 +48,7 @@ class NoAuthenticationError(AuthenticationError):
 
 
 class Authenticator:
-    def __init__(self, hs: HomeServer):
+    def __init__(self, hs: "HomeServer"):
         self._clock = hs.get_clock()
         self.keyring = hs.get_keyring()
         self.server_name = hs.hostname
@@ -114,11 +116,11 @@ class Authenticator:
         # alive
         retry_timings = await self.store.get_destination_retry_timings(origin)
         if retry_timings and retry_timings.retry_last_ts:
-            run_in_background(self._reset_retry_timings, origin)
+            run_in_background(self.reset_retry_timings, origin)
 
         return origin
 
-    async def _reset_retry_timings(self, origin: str) -> None:
+    async def reset_retry_timings(self, origin: str) -> None:
         try:
             logger.info("Marking origin %r as up", origin)
             await self.store.set_destination_retry_timings(origin, None, 0, 0)
@@ -227,7 +229,7 @@ class BaseFederationServlet:
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,

synapse/federation/transport/server/federation.py

@@ -12,7 +12,17 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 import logging
-from typing import Dict, List, Mapping, Optional, Sequence, Tuple, Type, Union
+from typing import (
+    TYPE_CHECKING,
+    Dict,
+    List,
+    Mapping,
+    Optional,
+    Sequence,
+    Tuple,
+    Type,
+    Union,
+)
 
 from typing_extensions import Literal
 
@@ -30,11 +40,13 @@ from synapse.http.servlet import (
     parse_string_from_args,
     parse_strings_from_args,
 )
-from synapse.server import HomeServer
 from synapse.types import JsonDict
 from synapse.util.ratelimitutils import FederationRateLimiter
 from synapse.util.versionstring import get_version_string
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 logger = logging.getLogger(__name__)
 issue_8631_logger = logging.getLogger("synapse.8631_debug")
 
@@ -47,7 +59,7 @@ class BaseFederationServerServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -596,7 +608,7 @@ class FederationSpaceSummaryServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -670,7 +682,7 @@ class FederationRoomHierarchyServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,
@@ -706,7 +718,7 @@ class RoomComplexityServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,

synapse/federation/transport/server/groups_local.py

@@ -11,7 +11,7 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-from typing import Dict, List, Tuple, Type
+from typing import TYPE_CHECKING, Dict, List, Tuple, Type
 
 from synapse.api.errors import SynapseError
 from synapse.federation.transport.server._base import (
@@ -19,10 +19,12 @@ from synapse.federation.transport.server._base import (
     BaseFederationServlet,
 )
 from synapse.handlers.groups_local import GroupsLocalHandler
-from synapse.server import HomeServer
 from synapse.types import JsonDict, get_domain_from_id
 from synapse.util.ratelimitutils import FederationRateLimiter
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 
 class BaseGroupsLocalServlet(BaseFederationServlet):
     """Abstract base class for federation servlet classes which provides a groups local handler.
@@ -32,7 +34,7 @@ class BaseGroupsLocalServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,

synapse/federation/transport/server/groups_server.py

@@ -11,7 +11,7 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-from typing import Dict, List, Tuple, Type
+from typing import TYPE_CHECKING, Dict, List, Tuple, Type
 
 from typing_extensions import Literal
 
@@ -22,10 +22,12 @@ from synapse.federation.transport.server._base import (
     BaseFederationServlet,
 )
 from synapse.http.servlet import parse_string_from_args
-from synapse.server import HomeServer
 from synapse.types import JsonDict, get_domain_from_id
 from synapse.util.ratelimitutils import FederationRateLimiter
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 
 class BaseGroupsServerServlet(BaseFederationServlet):
     """Abstract base class for federation servlet classes which provides a groups server handler.
@@ -35,7 +37,7 @@ class BaseGroupsServerServlet(BaseFederationServlet):
 
     def __init__(
         self,
-        hs: HomeServer,
+        hs: "HomeServer",
         authenticator: Authenticator,
         ratelimiter: FederationRateLimiter,
         server_name: str,

synapse/handlers/auth.py

@@ -2060,6 +2060,10 @@ CHECK_AUTH_CALLBACK = Callable[
         Optional[Tuple[str, Optional[Callable[["LoginResponse"], Awaitable[None]]]]]
     ],
 ]
+GET_USERNAME_FOR_REGISTRATION_CALLBACK = Callable[
+    [JsonDict, JsonDict],
+    Awaitable[Optional[str]],
+]
 
 
 class PasswordAuthProvider:
@@ -2072,6 +2076,9 @@ class PasswordAuthProvider:
         # lists of callbacks
         self.check_3pid_auth_callbacks: List[CHECK_3PID_AUTH_CALLBACK] = []
         self.on_logged_out_callbacks: List[ON_LOGGED_OUT_CALLBACK] = []
+        self.get_username_for_registration_callbacks: List[
+            GET_USERNAME_FOR_REGISTRATION_CALLBACK
+        ] = []
 
         # Mapping from login type to login parameters
         self._supported_login_types: Dict[str, Iterable[str]] = {}
@@ -2086,6 +2093,9 @@ class PasswordAuthProvider:
         auth_checkers: Optional[
             Dict[Tuple[str, Tuple[str, ...]], CHECK_AUTH_CALLBACK]
         ] = None,
+        get_username_for_registration: Optional[
+            GET_USERNAME_FOR_REGISTRATION_CALLBACK
+        ] = None,
     ) -> None:
         # Register check_3pid_auth callback
         if check_3pid_auth is not None:
@@ -2130,6 +2140,11 @@ class PasswordAuthProvider:
                 # Add the new method to the list of auth_checker_callbacks for this login type
                 self.auth_checker_callbacks.setdefault(login_type, []).append(callback)
 
+        if get_username_for_registration is not None:
+            self.get_username_for_registration_callbacks.append(
+                get_username_for_registration,
+            )
+
     def get_supported_login_types(self) -> Mapping[str, Iterable[str]]:
         """Get the login types supported by this password provider
 
@@ -2285,3 +2300,46 @@ class PasswordAuthProvider:
             except Exception as e:
                 logger.warning("Failed to run module API callback %s: %s", callback, e)
                 continue
+
+    async def get_username_for_registration(
+        self,
+        uia_results: JsonDict,
+        params: JsonDict,
+    ) -> Optional[str]:
+        """Defines the username to use when registering the user, using the credentials
+        and parameters provided during the UIA flow.
+
+        Stops at the first callback that returns a string.
+
+        Args:
+            uia_results: The credentials provided during the UIA flow.
+            params: The parameters provided by the registration request.
+
+        Returns:
+            The localpart to use when registering this user, or None if no module
+            returned a localpart.
+        """
+        for callback in self.get_username_for_registration_callbacks:
+            try:
+                res = await callback(uia_results, params)
+
+                if isinstance(res, str):
+                    return res
+                elif res is not None:
+                    # mypy complains that this line is unreachable because it assumes the
+                    # data returned by the module fits the expected type. We just want
+                    # to make sure this is the case.
+                    logger.warning(  # type: ignore[unreachable]
+                        "Ignoring non-string value returned by"
+                        " get_username_for_registration callback %s: %s",
+                        callback,
+                        res,
+                    )
+            except Exception as e:
+                logger.error(
+                    "Module raised an exception in get_username_for_registration: %s",
+                    e,
+                )
+                raise SynapseError(code=500, msg="Internal Server Error")
+
+        return None

synapse/handlers/deactivate_account.py

@@ -157,6 +157,9 @@ class DeactivateAccountHandler:
         # Mark the user as deactivated.
         await self.store.set_user_deactivated_status(user_id, True)
 
+        # Remove account data (including ignored users and push rules).
+        await self.store.purge_account_data_for_user(user_id)
+
         return identity_server_supports_unbinding
 
     async def _reject_pending_invites_for_user(self, user_id: str) -> None:

synapse/handlers/profile.py

@@ -31,6 +31,8 @@ from synapse.types import (
     create_requester,
     get_domain_from_id,
 )
+from synapse.util.caches.descriptors import cached
+from synapse.util.stringutils import parse_and_validate_mxc_uri
 
 if TYPE_CHECKING:
     from synapse.server import HomeServer
@@ -64,6 +66,11 @@ class ProfileHandler:
         self.user_directory_handler = hs.get_user_directory_handler()
         self.request_ratelimiter = hs.get_request_ratelimiter()
 
+        self.max_avatar_size = hs.config.server.max_avatar_size
+        self.allowed_avatar_mimetypes = hs.config.server.allowed_avatar_mimetypes
+
+        self.server_name = hs.config.server.server_name
+
         if hs.config.worker.run_background_tasks:
             self.clock.looping_call(
                 self._update_remote_profile_cache, self.PROFILE_UPDATE_MS
@@ -286,6 +293,9 @@ class ProfileHandler:
                 400, "Avatar URL is too long (max %i)" % (MAX_AVATAR_URL_LEN,)
             )
 
+        if not await self.check_avatar_size_and_mime_type(new_avatar_url):
+            raise SynapseError(403, "This avatar is not allowed", Codes.FORBIDDEN)
+
         avatar_url_to_set: Optional[str] = new_avatar_url
         if new_avatar_url == "":
             avatar_url_to_set = None
@@ -307,6 +317,63 @@ class ProfileHandler:
 
         await self._update_join_states(requester, target_user)
 
+    @cached()
+    async def check_avatar_size_and_mime_type(self, mxc: str) -> bool:
+        """Check that the size and content type of the avatar at the given MXC URI are
+        within the configured limits.
+
+        Args:
+            mxc: The MXC URI at which the avatar can be found.
+
+        Returns:
+             A boolean indicating whether the file can be allowed to be set as an avatar.
+        """
+        if not self.max_avatar_size and not self.allowed_avatar_mimetypes:
+            return True
+
+        server_name, _, media_id = parse_and_validate_mxc_uri(mxc)
+
+        if server_name == self.server_name:
+            media_info = await self.store.get_local_media(media_id)
+        else:
+            media_info = await self.store.get_cached_remote_media(server_name, media_id)
+
+        if media_info is None:
+            # Both configuration options need to access the file's metadata, and
+            # retrieving remote avatars just for this becomes a bit of a faff, especially
+            # if e.g. the file is too big. It's also generally safe to assume most files
+            # used as avatar are uploaded locally, or if the upload didn't happen as part
+            # of a PUT request on /avatar_url that the file was at least previewed by the
+            # user locally (and therefore downloaded to the remote media cache).
+            logger.warning("Forbidding avatar change to %s: avatar not on server", mxc)
+            return False
+
+        if self.max_avatar_size:
+            # Ensure avatar does not exceed max allowed avatar size
+            if media_info["media_length"] > self.max_avatar_size:
+                logger.warning(
+                    "Forbidding avatar change to %s: %d bytes is above the allowed size "
+                    "limit",
+                    mxc,
+                    media_info["media_length"],
+                )
+                return False
+
+        if self.allowed_avatar_mimetypes:
+            # Ensure the avatar's file type is allowed
+            if (
+                self.allowed_avatar_mimetypes
+                and media_info["media_type"] not in self.allowed_avatar_mimetypes
+            ):
+                logger.warning(
+                    "Forbidding avatar change to %s: mimetype %s not allowed",
+                    mxc,
+                    media_info["media_type"],
+                )
+                return False
+
+        return True
+
     async def on_profile_query(self, args: JsonDict) -> JsonDict:
         """Handles federation profile query requests."""
 

synapse/handlers/register.py

@@ -132,6 +132,7 @@ class RegistrationHandler:
         localpart: str,
         guest_access_token: Optional[str] = None,
         assigned_user_id: Optional[str] = None,
+        inhibit_user_in_use_error: bool = False,
     ) -> None:
         if types.contains_invalid_mxid_characters(localpart):
             raise SynapseError(
@@ -171,21 +172,22 @@ class RegistrationHandler:
 
         users = await self.store.get_users_by_id_case_insensitive(user_id)
         if users:
-            if not guest_access_token:
+            if not inhibit_user_in_use_error and not guest_access_token:
                 raise SynapseError(
                     400, "User ID already taken.", errcode=Codes.USER_IN_USE
                 )
-            user_data = await self.auth.get_user_by_access_token(guest_access_token)
+            if guest_access_token:
-            if (
+                user_data = await self.auth.get_user_by_access_token(guest_access_token)
-                not user_data.is_guest
+                if (
-                or UserID.from_string(user_data.user_id).localpart != localpart
+                    not user_data.is_guest
-            ):
+                    or UserID.from_string(user_data.user_id).localpart != localpart
-                raise AuthError(
+                ):
-                    403,
+                    raise AuthError(
-                    "Cannot register taken user ID without valid guest "
+                        403,
-                    "credentials for that user.",
+                        "Cannot register taken user ID without valid guest "
-                    errcode=Codes.FORBIDDEN,
+                        "credentials for that user.",
-                )
+                        errcode=Codes.FORBIDDEN,
+                    )
 
         if guest_access_token is None:
             try:

synapse/handlers/room.py

@@ -30,6 +30,7 @@ from typing import (
     Tuple,
 )
 
+import attr
 from typing_extensions import TypedDict
 
 from synapse.api.constants import (
@@ -60,6 +61,7 @@ from synapse.events.utils import copy_power_levels_contents
 from synapse.federation.federation_client import InvalidResponseError
 from synapse.handlers.federation import get_domains_from_state
 from synapse.rest.admin._base import assert_user_is_admin
+from synapse.storage.databases.main.relations import BundledAggregations
 from synapse.storage.state import StateFilter
 from synapse.streams import EventSource
 from synapse.types import (
@@ -90,6 +92,17 @@ id_server_scheme = "https://"
 FIVE_MINUTES_IN_MS = 5 * 60 * 1000
 
 
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class EventContext:
+    events_before: List[EventBase]
+    event: EventBase
+    events_after: List[EventBase]
+    state: List[EventBase]
+    aggregations: Dict[str, BundledAggregations]
+    start: str
+    end: str
+
+
 class RoomCreationHandler:
     def __init__(self, hs: "HomeServer"):
         self.store = hs.get_datastore()
@@ -1119,7 +1132,7 @@ class RoomContextHandler:
         limit: int,
         event_filter: Optional[Filter],
         use_admin_priviledge: bool = False,
-    ) -> Optional[JsonDict]:
+    ) -> Optional[EventContext]:
         """Retrieves events, pagination tokens and state around a given event
         in a room.
 
@@ -1167,38 +1180,28 @@ class RoomContextHandler:
         results = await self.store.get_events_around(
             room_id, event_id, before_limit, after_limit, event_filter
         )
+        events_before = results.events_before
+        events_after = results.events_after
 
         if event_filter:
-            results["events_before"] = await event_filter.filter(
+            events_before = await event_filter.filter(events_before)
-                results["events_before"]
+            events_after = await event_filter.filter(events_after)
-            )
-            results["events_after"] = await event_filter.filter(results["events_after"])
 
-        results["events_before"] = await filter_evts(results["events_before"])
+        events_before = await filter_evts(events_before)
-        results["events_after"] = await filter_evts(results["events_after"])
+        events_after = await filter_evts(events_after)
         # filter_evts can return a pruned event in case the user is allowed to see that
         # there's something there but not see the content, so use the event that's in
         # `filtered` rather than the event we retrieved from the datastore.
-        results["event"] = filtered[0]
+        event = filtered[0]
 
         # Fetch the aggregations.
         aggregations = await self.store.get_bundled_aggregations(
-            [results["event"]], user.to_string()
+            itertools.chain(events_before, (event,), events_after),
+            user.to_string(),
         )
-        aggregations.update(
-            await self.store.get_bundled_aggregations(
-                results["events_before"], user.to_string()
-            )
-        )
-        aggregations.update(
-            await self.store.get_bundled_aggregations(
-                results["events_after"], user.to_string()
-            )
-        )
-        results["aggregations"] = aggregations
 
-        if results["events_after"]:
+        if events_after:
-            last_event_id = results["events_after"][-1].event_id
+            last_event_id = events_after[-1].event_id
         else:
             last_event_id = event_id
 
@@ -1206,9 +1209,9 @@ class RoomContextHandler:
             state_filter = StateFilter.from_lazy_load_member_list(
                 ev.sender
                 for ev in itertools.chain(
-                    results["events_before"],
+                    events_before,
-                    (results["event"],),
+                    (event,),
-                    results["events_after"],
+                    events_after,
                 )
             )
         else:
@@ -1226,21 +1229,23 @@ class RoomContextHandler:
         if event_filter:
             state_events = await event_filter.filter(state_events)
 
-        results["state"] = await filter_evts(state_events)
-
         # We use a dummy token here as we only care about the room portion of
         # the token, which we replace.
         token = StreamToken.START
 
-        results["start"] = await token.copy_and_replace(
+        return EventContext(
-            "room_key", results["start"]
+            events_before=events_before,
-        ).to_string(self.store)
+            event=event,
-
+            events_after=events_after,
-        results["end"] = await token.copy_and_replace(
+            state=await filter_evts(state_events),
-            "room_key", results["end"]
+            aggregations=aggregations,
-        ).to_string(self.store)
+            start=await token.copy_and_replace("room_key", results.start).to_string(
-
+                self.store
-        return results
+            ),
+            end=await token.copy_and_replace("room_key", results.end).to_string(
+                self.store
+            ),
+        )
 
 
 class TimestampLookupHandler:

synapse/handlers/room_member.py

@@ -590,6 +590,12 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
                 errcode=Codes.BAD_JSON,
             )
 
+        if "avatar_url" in content:
+            if not await self.profile_handler.check_avatar_size_and_mime_type(
+                content["avatar_url"],
+            ):
+                raise SynapseError(403, "This avatar is not allowed", Codes.FORBIDDEN)
+
         # The event content should *not* include the authorising user as
         # it won't be properly signed. Strip it out since it might come
         # back from a client updating a display name / avatar.

synapse/handlers/search.py

@@ -361,36 +361,37 @@ class SearchHandler:
 
                 logger.info(
                     "Context for search returned %d and %d events",
-                    len(res["events_before"]),
+                    len(res.events_before),
-                    len(res["events_after"]),
+                    len(res.events_after),
                 )
 
-                res["events_before"] = await filter_events_for_client(
+                events_before = await filter_events_for_client(
-                    self.storage, user.to_string(), res["events_before"]
+                    self.storage, user.to_string(), res.events_before
                 )
 
-                res["events_after"] = await filter_events_for_client(
+                events_after = await filter_events_for_client(
-                    self.storage, user.to_string(), res["events_after"]
+                    self.storage, user.to_string(), res.events_after
                 )
 
-                res["start"] = await now_token.copy_and_replace(
+                context = {
-                    "room_key", res["start"]
+                    "events_before": events_before,
-                ).to_string(self.store)
+                    "events_after": events_after,
-
+                    "start": await now_token.copy_and_replace(
-                res["end"] = await now_token.copy_and_replace(
+                        "room_key", res.start
-                    "room_key", res["end"]
+                    ).to_string(self.store),
-                ).to_string(self.store)
+                    "end": await now_token.copy_and_replace(
+                        "room_key", res.end
+                    ).to_string(self.store),
+                }
 
                 if include_profile:
                     senders = {
                         ev.sender
-                        for ev in itertools.chain(
+                        for ev in itertools.chain(events_before, [event], events_after)
-                            res["events_before"], [event], res["events_after"]
-                        )
                     }
 
-                    if res["events_after"]:
+                    if events_after:
-                        last_event_id = res["events_after"][-1].event_id
+                        last_event_id = events_after[-1].event_id
                     else:
                         last_event_id = event.event_id
 
@@ -402,7 +403,7 @@ class SearchHandler:
                         last_event_id, state_filter
                     )
 
-                    res["profile_info"] = {
+                    context["profile_info"] = {
                         s.state_key: {
                             "displayname": s.content.get("displayname", None),
                             "avatar_url": s.content.get("avatar_url", None),
@@ -411,7 +412,7 @@ class SearchHandler:
                         if s.type == EventTypes.Member and s.state_key in senders
                     }
 
-                contexts[event.event_id] = res
+                contexts[event.event_id] = context
         else:
             contexts = {}
 
@@ -421,10 +422,10 @@ class SearchHandler:
 
         for context in contexts.values():
             context["events_before"] = self._event_serializer.serialize_events(
-                context["events_before"], time_now
+                context["events_before"], time_now  # type: ignore[arg-type]
             )
             context["events_after"] = self._event_serializer.serialize_events(
-                context["events_after"], time_now
+                context["events_after"], time_now  # type: ignore[arg-type]
             )
 
         state_results = {}

synapse/handlers/sync.py

@@ -37,6 +37,7 @@ from synapse.logging.context import current_context
 from synapse.logging.opentracing import SynapseTags, log_kv, set_tag, start_active_span
 from synapse.push.clientformat import format_push_rules_for_user
 from synapse.storage.databases.main.event_push_actions import NotifCounts
+from synapse.storage.databases.main.relations import BundledAggregations
 from synapse.storage.roommember import MemberSummary
 from synapse.storage.state import StateFilter
 from synapse.types import (
@@ -100,7 +101,7 @@ class TimelineBatch:
     limited: bool
     # A mapping of event ID to the bundled aggregations for the above events.
     # This is only calculated if limited is true.
-    bundled_aggregations: Optional[Dict[str, Dict[str, Any]]] = None
+    bundled_aggregations: Optional[Dict[str, BundledAggregations]] = None
 
     def __bool__(self) -> bool:
         """Make the result appear empty if there are no updates. This is used
@@ -1619,7 +1620,7 @@ class SyncHandler:
         # TODO: Can we `SELECT ignored_user_id FROM ignored_users WHERE ignorer_user_id=?;` instead?
         ignored_account_data = (
             await self.store.get_global_account_data_by_type_for_user(
-                AccountDataTypes.IGNORED_USER_LIST, user_id=user_id
+                user_id=user_id, data_type=AccountDataTypes.IGNORED_USER_LIST
             )
         )
 

synapse/http/client.py

@@ -731,15 +731,24 @@ class SimpleHttpClient:
         # straight back in again
 
         try:
-            length = await make_deferred_yieldable(
+            d = read_body_with_max_size(response, output_stream, max_size)
-                read_body_with_max_size(response, output_stream, max_size)
+
-            )
+            # Ensure that the body is not read forever.
+            d = timeout_deferred(d, 30, self.hs.get_reactor())
+
+            length = await make_deferred_yieldable(d)
         except BodyExceededMaxSize:
             raise SynapseError(
                 HTTPStatus.BAD_GATEWAY,
                 "Requested file is too large > %r bytes" % (max_size,),
                 Codes.TOO_LARGE,
             )
+        except defer.TimeoutError:
+            raise SynapseError(
+                HTTPStatus.BAD_GATEWAY,
+                "Requested file took too long to download",
+                Codes.TOO_LARGE,
+            )
         except Exception as e:
             raise SynapseError(
                 HTTPStatus.BAD_GATEWAY, ("Failed to download remote body: %s" % e)

synapse/http/site.py

@@ -407,7 +407,10 @@ class SynapseRequest(Request):
 
         user_agent = get_request_user_agent(self, "-")
 
-        code = str(self.code)
+        # int(self.code) looks redundant, because self.code is already an int.
+        # But self.code might be an HTTPStatus (which inherits from int)---which has
+        # a different string representation. So ensure we really have an integer.
+        code = str(int(self.code))
         if not self.finished:
             # we didn't send the full response before we gave up (presumably because
             # the connection dropped)

synapse/module_api/__init__.py

@@ -71,6 +71,7 @@ from synapse.handlers.account_validity import (
 from synapse.handlers.auth import (
     CHECK_3PID_AUTH_CALLBACK,
     CHECK_AUTH_CALLBACK,
+    GET_USERNAME_FOR_REGISTRATION_CALLBACK,
     ON_LOGGED_OUT_CALLBACK,
     AuthHandler,
 )
@@ -177,6 +178,7 @@ class ModuleApi:
         self._presence_stream = hs.get_event_sources().sources.presence
         self._state = hs.get_state_handler()
         self._clock: Clock = hs.get_clock()
+        self._registration_handler = hs.get_registration_handler()
         self._send_email_handler = hs.get_send_email_handler()
         self.custom_template_dir = hs.config.server.custom_template_directory
 
@@ -310,6 +312,9 @@ class ModuleApi:
         auth_checkers: Optional[
             Dict[Tuple[str, Tuple[str, ...]], CHECK_AUTH_CALLBACK]
         ] = None,
+        get_username_for_registration: Optional[
+            GET_USERNAME_FOR_REGISTRATION_CALLBACK
+        ] = None,
     ) -> None:
         """Registers callbacks for password auth provider capabilities.
 
@@ -319,6 +324,7 @@ class ModuleApi:
             check_3pid_auth=check_3pid_auth,
             on_logged_out=on_logged_out,
             auth_checkers=auth_checkers,
+            get_username_for_registration=get_username_for_registration,
         )
 
     def register_background_update_controller_callbacks(
@@ -1202,6 +1208,22 @@ class ModuleApi:
         """
         return await defer_to_thread(self._hs.get_reactor(), f, *args, **kwargs)
 
+    async def check_username(self, username: str) -> None:
+        """Checks if the provided username uses the grammar defined in the Matrix
+        specification, and is already being used by an existing user.
+
+        Added in Synapse v1.52.0.
+
+        Args:
+            username: The username to check. This is the local part of the user's full
+                Matrix user ID, i.e. it's "alice" if the full user ID is "@alice:foo.com".
+
+        Raises:
+            SynapseError with the errcode "M_USER_IN_USE" if the username is already in
+            use.
+        """
+        await self._registration_handler.check_username(username)
+
 
 class PublicRoomListManager:
     """Contains methods for adding to, removing from and querying whether a room

synapse/push/mailer.py

@@ -455,7 +455,7 @@ class Mailer:
         }
 
         the_events = await filter_events_for_client(
-            self.storage, user_id, results["events_before"]
+            self.storage, user_id, results.events_before
         )
         the_events.append(notif_event)
 

synapse/python_dependencies.py

@@ -70,13 +70,14 @@ REQUIREMENTS = [
     "pyasn1>=0.1.9",
     "pyasn1-modules>=0.0.7",
     "bcrypt>=3.1.0",
-    "pillow>=4.3.0",
+    "pillow>=5.4.0",
     "sortedcontainers>=1.4.4",
     "pymacaroons>=0.13.0",
     "msgpack>=0.5.2",
     "phonenumbers>=8.2.0",
     # we use GaugeHistogramMetric, which was added in prom-client 0.4.0.
-    "prometheus_client>=0.4.0",
+    # 0.13.0 has an incorrect type annotation, see #11832.
+    "prometheus_client>=0.4.0,<0.13.0",
     # we use `order`, which arrived in attrs 19.2.0.
     # Note: 21.1.0 broke `/sync`, see #9936
     "attrs>=19.2.0,!=21.1.0",
@@ -107,7 +108,7 @@ CONDITIONAL_REQUIREMENTS = {
     # `systemd.journal.JournalHandler`, as is documented in
     # `contrib/systemd/log_config.yaml`.
     "systemd": ["systemd-python>=231"],
-    "url_preview": ["lxml>=3.5.0"],
+    "url_preview": ["lxml>=4.2.0"],
     "sentry": ["sentry-sdk>=0.7.2"],
     "opentracing": ["jaeger-client>=4.0.0", "opentracing>=2.2.0"],
     "jwt": ["pyjwt>=1.6.4"],

synapse/replication/slave/storage/events.py

@@ -52,8 +52,8 @@ class SlavedEventStore(
     EventPushActionsWorkerStore,
     StreamWorkerStore,
     StateGroupWorkerStore,
-    EventsWorkerStore,
     SignatureWorkerStore,
+    EventsWorkerStore,
     UserErasureWorkerStore,
     RelationsWorkerStore,
     BaseSlavedStore,

synapse/rest/admin/__init__.py

@@ -41,7 +41,9 @@ from synapse.rest.admin.event_reports import (
     EventReportsRestServlet,
 )
 from synapse.rest.admin.federation import (
-    DestinationsRestServlet,
+    DestinationMembershipRestServlet,
+    DestinationResetConnectionRestServlet,
+    DestinationRestServlet,
     ListDestinationsRestServlet,
 )
 from synapse.rest.admin.groups import DeleteGroupAdminRestServlet
@@ -267,7 +269,9 @@ def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
     ListRegistrationTokensRestServlet(hs).register(http_server)
     NewRegistrationTokenRestServlet(hs).register(http_server)
     RegistrationTokenRestServlet(hs).register(http_server)
-    DestinationsRestServlet(hs).register(http_server)
+    DestinationMembershipRestServlet(hs).register(http_server)
+    DestinationResetConnectionRestServlet(hs).register(http_server)
+    DestinationRestServlet(hs).register(http_server)
     ListDestinationsRestServlet(hs).register(http_server)
 
     # Some servlets only get registered for the main process.

synapse/rest/admin/federation.py

@@ -16,6 +16,7 @@ from http import HTTPStatus
 from typing import TYPE_CHECKING, Tuple
 
 from synapse.api.errors import Codes, NotFoundError, SynapseError
+from synapse.federation.transport.server import Authenticator
 from synapse.http.servlet import RestServlet, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
 from synapse.rest.admin._base import admin_patterns, assert_requester_is_admin
@@ -90,7 +91,7 @@ class ListDestinationsRestServlet(RestServlet):
         return HTTPStatus.OK, response
 
 
-class DestinationsRestServlet(RestServlet):
+class DestinationRestServlet(RestServlet):
     """Get details of a destination.
     This needs user to have administrator access in Synapse.
 
@@ -145,3 +146,100 @@ class DestinationsRestServlet(RestServlet):
             }
 
         return HTTPStatus.OK, response
+
+
+class DestinationMembershipRestServlet(RestServlet):
+    """Get list of rooms of a destination.
+    This needs user to have administrator access in Synapse.
+
+    GET /_synapse/admin/v1/federation/destinations/<destination>/rooms?from=0&limit=10
+
+    returns:
+        200 OK with a list of rooms if success otherwise an error.
+
+    The parameters `from` and `limit` are required only for pagination.
+    By default, a `limit` of 100 is used.
+    """
+
+    PATTERNS = admin_patterns("/federation/destinations/(?P<destination>[^/]*)/rooms$")
+
+    def __init__(self, hs: "HomeServer"):
+        self._auth = hs.get_auth()
+        self._store = hs.get_datastore()
+
+    async def on_GET(
+        self, request: SynapseRequest, destination: str
+    ) -> Tuple[int, JsonDict]:
+        await assert_requester_is_admin(self._auth, request)
+
+        if not await self._store.is_destination_known(destination):
+            raise NotFoundError("Unknown destination")
+
+        start = parse_integer(request, "from", default=0)
+        limit = parse_integer(request, "limit", default=100)
+
+        if start < 0:
+            raise SynapseError(
+                HTTPStatus.BAD_REQUEST,
+                "Query parameter from must be a string representing a positive integer.",
+                errcode=Codes.INVALID_PARAM,
+            )
+
+        if limit < 0:
+            raise SynapseError(
+                HTTPStatus.BAD_REQUEST,
+                "Query parameter limit must be a string representing a positive integer.",
+                errcode=Codes.INVALID_PARAM,
+            )
+
+        direction = parse_string(request, "dir", default="f", allowed_values=("f", "b"))
+
+        rooms, total = await self._store.get_destination_rooms_paginate(
+            destination, start, limit, direction
+        )
+        response = {"rooms": rooms, "total": total}
+        if (start + limit) < total:
+            response["next_token"] = str(start + len(rooms))
+
+        return HTTPStatus.OK, response
+
+
+class DestinationResetConnectionRestServlet(RestServlet):
+    """Reset destinations' connection timeouts and wake it up.
+    This needs user to have administrator access in Synapse.
+
+    POST /_synapse/admin/v1/federation/destinations/<destination>/reset_connection
+    {}
+
+    returns:
+        200 OK otherwise an error.
+    """
+
+    PATTERNS = admin_patterns(
+        "/federation/destinations/(?P<destination>[^/]+)/reset_connection$"
+    )
+
+    def __init__(self, hs: "HomeServer"):
+        self._auth = hs.get_auth()
+        self._store = hs.get_datastore()
+        self._authenticator = Authenticator(hs)
+
+    async def on_POST(
+        self, request: SynapseRequest, destination: str
+    ) -> Tuple[int, JsonDict]:
+        await assert_requester_is_admin(self._auth, request)
+
+        if not await self._store.is_destination_known(destination):
+            raise NotFoundError("Unknown destination")
+
+        retry_timings = await self._store.get_destination_retry_timings(destination)
+        if not (retry_timings and retry_timings.retry_last_ts):
+            raise SynapseError(
+                HTTPStatus.BAD_REQUEST,
+                "The retry timing does not need to be reset for this destination.",
+            )
+
+        # reset timings and wake up
+        await self._authenticator.reset_retry_timings(destination)
+
+        return HTTPStatus.OK, {}

synapse/rest/admin/rooms.py

@@ -729,7 +729,7 @@ class RoomEventContextServlet(RestServlet):
         else:
             event_filter = None
 
-        results = await self.room_context_handler.get_event_context(
+        event_context = await self.room_context_handler.get_event_context(
             requester,
             room_id,
             event_id,
@@ -738,25 +738,34 @@ class RoomEventContextServlet(RestServlet):
             use_admin_priviledge=True,
         )
 
-        if not results:
+        if not event_context:
             raise SynapseError(
                 HTTPStatus.NOT_FOUND, "Event not found.", errcode=Codes.NOT_FOUND
             )
 
         time_now = self.clock.time_msec()
-        aggregations = results.pop("aggregations", None)
+        results = {
-        results["events_before"] = self._event_serializer.serialize_events(
+            "events_before": self._event_serializer.serialize_events(
-            results["events_before"], time_now, bundle_aggregations=aggregations
+                event_context.events_before,
-        )
+                time_now,
-        results["event"] = self._event_serializer.serialize_event(
+                bundle_aggregations=event_context.aggregations,
-            results["event"], time_now, bundle_aggregations=aggregations
+            ),
-        )
+            "event": self._event_serializer.serialize_event(
-        results["events_after"] = self._event_serializer.serialize_events(
+                event_context.event,
-            results["events_after"], time_now, bundle_aggregations=aggregations
+                time_now,
-        )
+                bundle_aggregations=event_context.aggregations,
-        results["state"] = self._event_serializer.serialize_events(
+            ),
-            results["state"], time_now
+            "events_after": self._event_serializer.serialize_events(
-        )
+                event_context.events_after,
+                time_now,
+                bundle_aggregations=event_context.aggregations,
+            ),
+            "state": self._event_serializer.serialize_events(
+                event_context.state, time_now
+            ),
+            "start": event_context.start,
+            "end": event_context.end,
+        }
 
         return HTTPStatus.OK, results
 

synapse/rest/client/account_data.py

@@ -66,7 +66,7 @@ class AccountDataServlet(RestServlet):
             raise AuthError(403, "Cannot get account data for other users.")
 
         event = await self.store.get_global_account_data_by_type_for_user(
-            account_data_type, user_id
+            user_id, account_data_type
         )
 
         if event is None:

synapse/rest/client/register.py

@@ -339,12 +339,19 @@ class UsernameAvailabilityRestServlet(RestServlet):
             ),
         )
 
+        self.inhibit_user_in_use_error = (
+            hs.config.registration.inhibit_user_in_use_error
+        )
+
     async def on_GET(self, request: Request) -> Tuple[int, JsonDict]:
         if not self.hs.config.registration.enable_registration:
             raise SynapseError(
                 403, "Registration has been disabled", errcode=Codes.FORBIDDEN
             )
 
+        if self.inhibit_user_in_use_error:
+            return 200, {"available": True}
+
         ip = request.getClientIP()
         with self.ratelimiter.ratelimit(ip) as wait_deferred:
             await wait_deferred
@@ -418,10 +425,14 @@ class RegisterRestServlet(RestServlet):
         self.ratelimiter = hs.get_registration_ratelimiter()
         self.password_policy_handler = hs.get_password_policy_handler()
         self.clock = hs.get_clock()
+        self.password_auth_provider = hs.get_password_auth_provider()
         self._registration_enabled = self.hs.config.registration.enable_registration
         self._refresh_tokens_enabled = (
             hs.config.registration.refreshable_access_token_lifetime is not None
         )
+        self._inhibit_user_in_use_error = (
+            hs.config.registration.inhibit_user_in_use_error
+        )
 
         self._registration_flows = _calculate_registration_flows(
             hs.config, self.auth_handler
@@ -564,6 +575,7 @@ class RegisterRestServlet(RestServlet):
                 desired_username,
                 guest_access_token=guest_access_token,
                 assigned_user_id=registered_user_id,
+                inhibit_user_in_use_error=self._inhibit_user_in_use_error,
             )
 
         # Check if the user-interactive authentication flows are complete, if
@@ -627,7 +639,16 @@ class RegisterRestServlet(RestServlet):
             if not password_hash:
                 raise SynapseError(400, "Missing params: password", Codes.MISSING_PARAM)
 
-            desired_username = params.get("username", None)
+            desired_username = await (
+                self.password_auth_provider.get_username_for_registration(
+                    auth_result,
+                    params,
+                )
+            )
+
+            if desired_username is None:
+                desired_username = params.get("username", None)
+
             guest_access_token = params.get("guest_access_token", None)
 
             if desired_username is not None:

synapse/rest/client/room.py

@@ -706,27 +706,36 @@ class RoomEventContextServlet(RestServlet):
         else:
             event_filter = None
 
-        results = await self.room_context_handler.get_event_context(
+        event_context = await self.room_context_handler.get_event_context(
             requester, room_id, event_id, limit, event_filter
         )
 
-        if not results:
+        if not event_context:
             raise SynapseError(404, "Event not found.", errcode=Codes.NOT_FOUND)
 
         time_now = self.clock.time_msec()
-        aggregations = results.pop("aggregations", None)
+        results = {
-        results["events_before"] = self._event_serializer.serialize_events(
+            "events_before": self._event_serializer.serialize_events(
-            results["events_before"], time_now, bundle_aggregations=aggregations
+                event_context.events_before,
-        )
+                time_now,
-        results["event"] = self._event_serializer.serialize_event(
+                bundle_aggregations=event_context.aggregations,
-            results["event"], time_now, bundle_aggregations=aggregations
+            ),
-        )
+            "event": self._event_serializer.serialize_event(
-        results["events_after"] = self._event_serializer.serialize_events(
+                event_context.event,
-            results["events_after"], time_now, bundle_aggregations=aggregations
+                time_now,
-        )
+                bundle_aggregations=event_context.aggregations,
-        results["state"] = self._event_serializer.serialize_events(
+            ),
-            results["state"], time_now
+            "events_after": self._event_serializer.serialize_events(
-        )
+                event_context.events_after,
+                time_now,
+                bundle_aggregations=event_context.aggregations,
+            ),
+            "state": self._event_serializer.serialize_events(
+                event_context.state, time_now
+            ),
+            "start": event_context.start,
+            "end": event_context.end,
+        }
 
         return 200, results
 

synapse/rest/client/sync.py

@@ -48,6 +48,7 @@ from synapse.http.server import HttpServer
 from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
 from synapse.logging.opentracing import trace
+from synapse.storage.databases.main.relations import BundledAggregations
 from synapse.types import JsonDict, StreamToken
 from synapse.util import json_decoder
 
@@ -526,7 +527,7 @@ class SyncRestServlet(RestServlet):
 
         def serialize(
             events: Iterable[EventBase],
-            aggregations: Optional[Dict[str, Dict[str, Any]]] = None,
+            aggregations: Optional[Dict[str, BundledAggregations]] = None,
         ) -> List[JsonDict]:
             return self._event_serializer.serialize_events(
                 events,

synapse/rest/media/v1/preview_html.py

@@ -321,14 +321,33 @@ def _iterate_over_text(
 
 
 def rebase_url(url: str, base: str) -> str:
-    base_parts = list(urlparse.urlparse(base))
+    """
+    Resolves a potentially relative `url` against an absolute `base` URL.
+
+    For example:
+
+        >>> rebase_url("subpage", "https://example.com/foo/")
+        'https://example.com/foo/subpage'
+        >>> rebase_url("sibling", "https://example.com/foo")
+        'https://example.com/sibling'
+        >>> rebase_url("/bar", "https://example.com/foo/")
+        'https://example.com/bar'
+        >>> rebase_url("https://alice.com/a/", "https://example.com/foo/")
+        'https://alice.com/a'
+    """
+    base_parts = urlparse.urlparse(base)
+    # Convert the parsed URL to a list for (potential) modification.
     url_parts = list(urlparse.urlparse(url))
-    if not url_parts[0]:  # fix up schema
+    # Add a scheme, if one does not exist.
-        url_parts[0] = base_parts[0] or "http"
+    if not url_parts[0]:
-    if not url_parts[1]:  # fix up hostname
+        url_parts[0] = base_parts.scheme or "http"
-        url_parts[1] = base_parts[1]
+    # Fix up the hostname, if this is not a data URL.
+    if url_parts[0] != "data" and not url_parts[1]:
+        url_parts[1] = base_parts.netloc
+        # If the path does not start with a /, nest it under the base path's last
+        # directory.
         if not url_parts[2].startswith("/"):
-            url_parts[2] = re.sub(r"/[^/]+$", "/", base_parts[2]) + url_parts[2]
+            url_parts[2] = re.sub(r"/[^/]+$", "/", base_parts.path) + url_parts[2]
     return urlparse.urlunparse(url_parts)
 
 

synapse/rest/media/v1/preview_url_resource.py

@@ -21,8 +21,9 @@ import re
 import shutil
 import sys
 import traceback
-from typing import TYPE_CHECKING, Iterable, Optional, Tuple
+from typing import TYPE_CHECKING, BinaryIO, Iterable, Optional, Tuple
 from urllib import parse as urlparse
+from urllib.request import urlopen
 
 import attr
 
@@ -70,6 +71,17 @@ ONE_DAY = 24 * ONE_HOUR
 IMAGE_CACHE_EXPIRY_MS = 2 * ONE_DAY
 
 
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class DownloadResult:
+    length: int
+    uri: str
+    response_code: int
+    media_type: str
+    download_name: Optional[str]
+    expires: int
+    etag: Optional[str]
+
+
 @attr.s(slots=True, frozen=True, auto_attribs=True)
 class MediaInfo:
     """
@@ -256,7 +268,7 @@ class PreviewUrlResource(DirectServeJsonResource):
         if oembed_url:
             url_to_download = oembed_url
 
-        media_info = await self._download_url(url_to_download, user)
+        media_info = await self._handle_url(url_to_download, user)
 
         logger.debug("got media_info of '%s'", media_info)
 
@@ -297,7 +309,9 @@ class PreviewUrlResource(DirectServeJsonResource):
                 oembed_url = self._oembed.autodiscover_from_html(tree)
                 og_from_oembed: JsonDict = {}
                 if oembed_url:
-                    oembed_info = await self._download_url(oembed_url, user)
+                    oembed_info = await self._handle_url(
+                        oembed_url, user, allow_data_urls=True
+                    )
                     (
                         og_from_oembed,
                         author_name,
@@ -367,7 +381,135 @@ class PreviewUrlResource(DirectServeJsonResource):
 
         return jsonog.encode("utf8")
 
-    async def _download_url(self, url: str, user: UserID) -> MediaInfo:
+    async def _download_url(self, url: str, output_stream: BinaryIO) -> DownloadResult:
+        """
+        Fetches a remote URL and parses the headers.
+
+        Args:
+             url: The URL to fetch.
+             output_stream: The stream to write the content to.
+
+        Returns:
+            A tuple of:
+                Media length, URL downloaded, the HTTP response code,
+                the media type, the downloaded file name, the number of
+                milliseconds the result is valid for, the etag header.
+        """
+
+        try:
+            logger.debug("Trying to get preview for url '%s'", url)
+            length, headers, uri, code = await self.client.get_file(
+                url,
+                output_stream=output_stream,
+                max_size=self.max_spider_size,
+                headers={"Accept-Language": self.url_preview_accept_language},
+            )
+        except SynapseError:
+            # Pass SynapseErrors through directly, so that the servlet
+            # handler will return a SynapseError to the client instead of
+            # blank data or a 500.
+            raise
+        except DNSLookupError:
+            # DNS lookup returned no results
+            # Note: This will also be the case if one of the resolved IP
+            # addresses is blacklisted
+            raise SynapseError(
+                502,
+                "DNS resolution failure during URL preview generation",
+                Codes.UNKNOWN,
+            )
+        except Exception as e:
+            # FIXME: pass through 404s and other error messages nicely
+            logger.warning("Error downloading %s: %r", url, e)
+
+            raise SynapseError(
+                500,
+                "Failed to download content: %s"
+                % (traceback.format_exception_only(sys.exc_info()[0], e),),
+                Codes.UNKNOWN,
+            )
+
+        if b"Content-Type" in headers:
+            media_type = headers[b"Content-Type"][0].decode("ascii")
+        else:
+            media_type = "application/octet-stream"
+
+        download_name = get_filename_from_headers(headers)
+
+        # FIXME: we should calculate a proper expiration based on the
+        # Cache-Control and Expire headers.  But for now, assume 1 hour.
+        expires = ONE_HOUR
+        etag = headers[b"ETag"][0].decode("ascii") if b"ETag" in headers else None
+
+        return DownloadResult(
+            length, uri, code, media_type, download_name, expires, etag
+        )
+
+    async def _parse_data_url(
+        self, url: str, output_stream: BinaryIO
+    ) -> DownloadResult:
+        """
+        Parses a data: URL.
+
+        Args:
+             url: The URL to parse.
+             output_stream: The stream to write the content to.
+
+        Returns:
+            A tuple of:
+                Media length, URL downloaded, the HTTP response code,
+                the media type, the downloaded file name, the number of
+                milliseconds the result is valid for, the etag header.
+        """
+
+        try:
+            logger.debug("Trying to parse data url '%s'", url)
+            with urlopen(url) as url_info:
+                # TODO Can this be more efficient.
+                output_stream.write(url_info.read())
+        except Exception as e:
+            logger.warning("Error parsing data: URL %s: %r", url, e)
+
+            raise SynapseError(
+                500,
+                "Failed to parse data URL: %s"
+                % (traceback.format_exception_only(sys.exc_info()[0], e),),
+                Codes.UNKNOWN,
+            )
+
+        return DownloadResult(
+            # Read back the length that has been written.
+            length=output_stream.tell(),
+            uri=url,
+            # If it was parsed, consider this a 200 OK.
+            response_code=200,
+            # urlopen shoves the media-type from the data URL into the content type
+            # header object.
+            media_type=url_info.headers.get_content_type(),
+            # Some features are not supported by data: URLs.
+            download_name=None,
+            expires=ONE_HOUR,
+            etag=None,
+        )
+
+    async def _handle_url(
+        self, url: str, user: UserID, allow_data_urls: bool = False
+    ) -> MediaInfo:
+        """
+        Fetches content from a URL and parses the result to generate a MediaInfo.
+
+        It uses the media storage provider to persist the fetched content and
+        stores the mapping into the database.
+
+        Args:
+             url: The URL to fetch.
+             user: The user who ahs requested this URL.
+             allow_data_urls: True if data URLs should be allowed.
+
+        Returns:
+            A MediaInfo object describing the fetched content.
+        """
+
         # TODO: we should probably honour robots.txt... except in practice
         # we're most likely being explicitly triggered by a human rather than a
         # bot, so are we really a robot?
@@ -377,61 +519,27 @@ class PreviewUrlResource(DirectServeJsonResource):
         file_info = FileInfo(server_name=None, file_id=file_id, url_cache=True)
 
         with self.media_storage.store_into_file(file_info) as (f, fname, finish):
-            try:
+            if url.startswith("data:"):
-                logger.debug("Trying to get preview for url '%s'", url)
+                if not allow_data_urls:
-                length, headers, uri, code = await self.client.get_file(
+                    raise SynapseError(
-                    url,
+                        500, "Previewing of data: URLs is forbidden", Codes.UNKNOWN
-                    output_stream=f,
+                    )
-                    max_size=self.max_spider_size,
-                    headers={"Accept-Language": self.url_preview_accept_language},
-                )
-            except SynapseError:
-                # Pass SynapseErrors through directly, so that the servlet
-                # handler will return a SynapseError to the client instead of
-                # blank data or a 500.
-                raise
-            except DNSLookupError:
-                # DNS lookup returned no results
-                # Note: This will also be the case if one of the resolved IP
-                # addresses is blacklisted
-                raise SynapseError(
-                    502,
-                    "DNS resolution failure during URL preview generation",
-                    Codes.UNKNOWN,
-                )
-            except Exception as e:
-                # FIXME: pass through 404s and other error messages nicely
-                logger.warning("Error downloading %s: %r", url, e)
 
-                raise SynapseError(
+                download_result = await self._parse_data_url(url, f)
-                    500,
-                    "Failed to download content: %s"
-                    % (traceback.format_exception_only(sys.exc_info()[0], e),),
-                    Codes.UNKNOWN,
-                )
-            await finish()
-
-            if b"Content-Type" in headers:
-                media_type = headers[b"Content-Type"][0].decode("ascii")
             else:
-                media_type = "application/octet-stream"
+                download_result = await self._download_url(url, f)
 
-            download_name = get_filename_from_headers(headers)
+            await finish()
-
-            # FIXME: we should calculate a proper expiration based on the
-            # Cache-Control and Expire headers.  But for now, assume 1 hour.
-            expires = ONE_HOUR
-            etag = headers[b"ETag"][0].decode("ascii") if b"ETag" in headers else None
 
         try:
             time_now_ms = self.clock.time_msec()
 
             await self.store.store_local_media(
                 media_id=file_id,
-                media_type=media_type,
+                media_type=download_result.media_type,
                 time_now_ms=time_now_ms,
-                upload_name=download_name,
+                upload_name=download_result.download_name,
-                media_length=length,
+                media_length=download_result.length,
                 user_id=user,
                 url_cache=url,
             )
@@ -444,16 +552,16 @@ class PreviewUrlResource(DirectServeJsonResource):
             raise
 
         return MediaInfo(
-            media_type=media_type,
+            media_type=download_result.media_type,
-            media_length=length,
+            media_length=download_result.length,
-            download_name=download_name,
+            download_name=download_result.download_name,
             created_ts_ms=time_now_ms,
             filesystem_id=file_id,
             filename=fname,
-            uri=uri,
+            uri=download_result.uri,
-            response_code=code,
+            response_code=download_result.response_code,
-            expires=expires,
+            expires=download_result.expires,
-            etag=etag,
+            etag=download_result.etag,
         )
 
     async def _precache_image_url(
@@ -474,8 +582,8 @@ class PreviewUrlResource(DirectServeJsonResource):
         # FIXME: it might be cleaner to use the same flow as the main /preview_url
         # request itself and benefit from the same caching etc.  But for now we
         # just rely on the caching on the master request to speed things up.
-        image_info = await self._download_url(
+        image_info = await self._handle_url(
-            rebase_url(og["og:image"], media_info.uri), user
+            rebase_url(og["og:image"], media_info.uri), user, allow_data_urls=True
         )
 
         if _is_media(image_info.media_type):

synapse/storage/database.py

@@ -702,6 +702,7 @@ class DatabasePool:
         func: Callable[..., R],
         *args: Any,
         db_autocommit: bool = False,
+        isolation_level: Optional[int] = None,
         **kwargs: Any,
     ) -> R:
         """Starts a transaction on the database and runs a given function
@@ -724,6 +725,7 @@ class DatabasePool:
                 called multiple times if the transaction is retried, so must
                 correctly handle that case.
 
+            isolation_level: Set the server isolation level for this transaction.
             args: positional args to pass to `func`
             kwargs: named args to pass to `func`
 
@@ -746,6 +748,7 @@ class DatabasePool:
                     func,
                     *args,
                     db_autocommit=db_autocommit,
+                    isolation_level=isolation_level,
                     **kwargs,
                 )
 
@@ -763,6 +766,7 @@ class DatabasePool:
         func: Callable[..., R],
         *args: Any,
         db_autocommit: bool = False,
+        isolation_level: Optional[int] = None,
         **kwargs: Any,
     ) -> R:
         """Wraps the .runWithConnection() method on the underlying db_pool.
@@ -775,6 +779,7 @@ class DatabasePool:
             db_autocommit: Whether to run the function in "autocommit" mode,
                 i.e. outside of a transaction. This is useful for transaction
                 that are only a single query. Currently only affects postgres.
+            isolation_level: Set the server isolation level for this transaction.
             kwargs: named args to pass to `func`
 
         Returns:
@@ -834,6 +839,10 @@ class DatabasePool:
                     try:
                         if db_autocommit:
                             self.engine.attempt_to_set_autocommit(conn, True)
+                        if isolation_level is not None:
+                            self.engine.attempt_to_set_isolation_level(
+                                conn, isolation_level
+                            )
 
                         db_conn = LoggingDatabaseConnection(
                             conn, self.engine, "runWithConnection"
@@ -842,6 +851,8 @@ class DatabasePool:
                     finally:
                         if db_autocommit:
                             self.engine.attempt_to_set_autocommit(conn, False)
+                        if isolation_level:
+                            self.engine.attempt_to_set_isolation_level(conn, None)
 
         return await make_deferred_yieldable(
             self._db_pool.runWithConnection(inner_func, *args, **kwargs)

synapse/storage/databases/main/account_data.py

@@ -26,6 +26,7 @@ from synapse.storage.database import (
     LoggingTransaction,
 )
 from synapse.storage.databases.main.cache import CacheInvalidationWorkerStore
+from synapse.storage.databases.main.push_rule import PushRulesWorkerStore
 from synapse.storage.engines import PostgresEngine
 from synapse.storage.util.id_generators import (
     AbstractStreamIdGenerator,
@@ -44,7 +45,7 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
-class AccountDataWorkerStore(CacheInvalidationWorkerStore):
+class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore):
     def __init__(
         self,
         database: DatabasePool,
@@ -158,9 +159,9 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
             "get_account_data_for_user", get_account_data_for_user_txn
         )
 
-    @cached(num_args=2, max_entries=5000)
+    @cached(num_args=2, max_entries=5000, tree=True)
     async def get_global_account_data_by_type_for_user(
-        self, data_type: str, user_id: str
+        self, user_id: str, data_type: str
     ) -> Optional[JsonDict]:
         """
         Returns:
@@ -179,7 +180,7 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
         else:
             return None
 
-    @cached(num_args=2)
+    @cached(num_args=2, tree=True)
     async def get_account_data_for_room(
         self, user_id: str, room_id: str
     ) -> Dict[str, JsonDict]:
@@ -210,7 +211,7 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
             "get_account_data_for_room", get_account_data_for_room_txn
         )
 
-    @cached(num_args=3, max_entries=5000)
+    @cached(num_args=3, max_entries=5000, tree=True)
     async def get_account_data_for_room_and_type(
         self, user_id: str, room_id: str, account_data_type: str
     ) -> Optional[JsonDict]:
@@ -392,7 +393,7 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
             for row in rows:
                 if not row.room_id:
                     self.get_global_account_data_by_type_for_user.invalidate(
-                        (row.data_type, row.user_id)
+                        (row.user_id, row.data_type)
                     )
                 self.get_account_data_for_user.invalidate((row.user_id,))
                 self.get_account_data_for_room.invalidate((row.user_id, row.room_id))
@@ -476,7 +477,7 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
             self._account_data_stream_cache.entity_has_changed(user_id, next_id)
             self.get_account_data_for_user.invalidate((user_id,))
             self.get_global_account_data_by_type_for_user.invalidate(
-                (account_data_type, user_id)
+                (user_id, account_data_type)
             )
 
         return self._account_data_id_gen.get_current_token()
@@ -546,6 +547,74 @@ class AccountDataWorkerStore(CacheInvalidationWorkerStore):
         for ignored_user_id in previously_ignored_users ^ currently_ignored_users:
             self._invalidate_cache_and_stream(txn, self.ignored_by, (ignored_user_id,))
 
+    async def purge_account_data_for_user(self, user_id: str) -> None:
+        """
+        Removes the account data for a user.
+
+        This is intended to be used upon user deactivation and also removes any
+        derived information from account data (e.g. push rules and ignored users).
+
+        Args:
+            user_id: The user ID to remove data for.
+        """
+
+        def purge_account_data_for_user_txn(txn: LoggingTransaction) -> None:
+            # Purge from the primary account_data tables.
+            self.db_pool.simple_delete_txn(
+                txn, table="account_data", keyvalues={"user_id": user_id}
+            )
+
+            self.db_pool.simple_delete_txn(
+                txn, table="room_account_data", keyvalues={"user_id": user_id}
+            )
+
+            # Purge from ignored_users where this user is the ignorer.
+            # N.B. We don't purge where this user is the ignoree, because that
+            #      interferes with other users' account data.
+            #      It's also not this user's data to delete!
+            self.db_pool.simple_delete_txn(
+                txn, table="ignored_users", keyvalues={"ignorer_user_id": user_id}
+            )
+
+            # Remove the push rules
+            self.db_pool.simple_delete_txn(
+                txn, table="push_rules", keyvalues={"user_name": user_id}
+            )
+            self.db_pool.simple_delete_txn(
+                txn, table="push_rules_enable", keyvalues={"user_name": user_id}
+            )
+            self.db_pool.simple_delete_txn(
+                txn, table="push_rules_stream", keyvalues={"user_id": user_id}
+            )
+
+            # Invalidate caches as appropriate
+            self._invalidate_cache_and_stream(
+                txn, self.get_account_data_for_room_and_type, (user_id,)
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_account_data_for_user, (user_id,)
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_global_account_data_by_type_for_user, (user_id,)
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_account_data_for_room, (user_id,)
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_push_rules_for_user, (user_id,)
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_push_rules_enabled_for_user, (user_id,)
+            )
+            # This user might be contained in the ignored_by cache for other users,
+            # so we have to invalidate it all.
+            self._invalidate_all_cache_and_stream(txn, self.ignored_by)
+
+        await self.db_pool.runInteraction(
+            "purge_account_data_for_user_txn",
+            purge_account_data_for_user_txn,
+        )
+
 
 class AccountDataStore(AccountDataWorkerStore):
     pass

synapse/storage/databases/main/appservice.py

@@ -384,7 +384,7 @@ class ApplicationServiceTransactionWorkerStore(
             "get_new_events_for_appservice", get_new_events_for_appservice_txn
         )
 
-        events = await self.get_events_as_list(event_ids)
+        events = await self.get_events_as_list(event_ids, get_prev_content=True)
 
         return upper_bound, events
 

synapse/storage/databases/main/event_federation.py

@@ -65,7 +65,7 @@ class _NoChainCoverIndex(Exception):
         super().__init__("Unexpectedly no chain cover for events in %s" % (room_id,))
 
 
-class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBaseStore):
+class EventFederationWorkerStore(SignatureWorkerStore, EventsWorkerStore, SQLBaseStore):
     def __init__(
         self,
         database: DatabasePool,

synapse/storage/databases/main/events.py

@@ -1389,6 +1389,8 @@ class PersistEventsStore:
                 "received_ts",
                 "sender",
                 "contains_url",
+                "state_key",
+                "rejection_reason",
             ),
             values=(
                 (
@@ -1405,8 +1407,10 @@ class PersistEventsStore:
                     self._clock.time_msec(),
                     event.sender,
                     "url" in event.content and isinstance(event.content["url"], str),
+                    event.get_state_key(),
+                    context.rejected or None,
                 )
-                for event, _ in events_and_contexts
+                for event, context in events_and_contexts
             ),
         )
 
@@ -1456,6 +1460,7 @@ class PersistEventsStore:
         for event, context in events_and_contexts:
             if context.rejected:
                 # Insert the event_id into the rejections table
+                # (events.rejection_reason has already been done)
                 self._store_rejections_txn(txn, event.event_id, context.rejected)
                 to_remove.add(event)
 

synapse/storage/databases/main/purge_events.py

@@ -390,7 +390,6 @@ class PurgeEventsStore(StateGroupWorkerStore, CacheInvalidationWorkerStore):
             "event_search",
             "events",
             "group_rooms",
-            "public_room_list_stream",
             "receipts_graph",
             "receipts_linearized",
             "room_aliases",

synapse/storage/databases/main/relations.py

@@ -13,17 +13,7 @@
 # limitations under the License.
 
 import logging
-from typing import (
+from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union, cast
-    TYPE_CHECKING,
-    Any,
-    Dict,
-    Iterable,
-    List,
-    Optional,
-    Tuple,
-    Union,
-    cast,
-)
 
 import attr
 from frozendict import frozendict
@@ -43,6 +33,7 @@ from synapse.storage.relations import (
     PaginationChunk,
     RelationPaginationToken,
 )
+from synapse.types import JsonDict
 from synapse.util.caches.descriptors import cached
 
 if TYPE_CHECKING:
@@ -51,6 +42,30 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class _ThreadAggregation:
+    latest_event: EventBase
+    count: int
+    current_user_participated: bool
+
+
+@attr.s(slots=True, auto_attribs=True)
+class BundledAggregations:
+    """
+    The bundled aggregations for an event.
+
+    Some values require additional processing during serialization.
+    """
+
+    annotations: Optional[JsonDict] = None
+    references: Optional[JsonDict] = None
+    replace: Optional[EventBase] = None
+    thread: Optional[_ThreadAggregation] = None
+
+    def __bool__(self) -> bool:
+        return bool(self.annotations or self.references or self.replace or self.thread)
+
+
 class RelationsWorkerStore(SQLBaseStore):
     def __init__(
         self,
@@ -60,7 +75,6 @@ class RelationsWorkerStore(SQLBaseStore):
     ):
         super().__init__(database, db_conn, hs)
 
-        self._msc1849_enabled = hs.config.experimental.msc1849_enabled
         self._msc3440_enabled = hs.config.experimental.msc3440_enabled
 
     @cached(tree=True)
@@ -585,7 +599,7 @@ class RelationsWorkerStore(SQLBaseStore):
 
     async def _get_bundled_aggregation_for_event(
         self, event: EventBase, user_id: str
-    ) -> Optional[Dict[str, Any]]:
+    ) -> Optional[BundledAggregations]:
         """Generate bundled aggregations for an event.
 
         Note that this does not use a cache, but depends on cached methods.
@@ -616,24 +630,24 @@ class RelationsWorkerStore(SQLBaseStore):
         # The bundled aggregations to include, a mapping of relation type to a
         # type-specific value. Some types include the direct return type here
         # while others need more processing during serialization.
-        aggregations: Dict[str, Any] = {}
+        aggregations = BundledAggregations()
 
         annotations = await self.get_aggregation_groups_for_event(event_id, room_id)
         if annotations.chunk:
-            aggregations[RelationTypes.ANNOTATION] = annotations.to_dict()
+            aggregations.annotations = annotations.to_dict()
 
         references = await self.get_relations_for_event(
             event_id, room_id, RelationTypes.REFERENCE, direction="f"
         )
         if references.chunk:
-            aggregations[RelationTypes.REFERENCE] = references.to_dict()
+            aggregations.references = references.to_dict()
 
         edit = None
         if event.type == EventTypes.Message:
             edit = await self.get_applicable_edit(event_id, room_id)
 
         if edit:
-            aggregations[RelationTypes.REPLACE] = edit
+            aggregations.replace = edit
 
         # If this event is the start of a thread, include a summary of the replies.
         if self._msc3440_enabled:
@@ -644,11 +658,11 @@ class RelationsWorkerStore(SQLBaseStore):
                 event_id, room_id, user_id
             )
             if latest_thread_event:
-                aggregations[RelationTypes.THREAD] = {
+                aggregations.thread = _ThreadAggregation(
-                    "latest_event": latest_thread_event,
+                    latest_event=latest_thread_event,
-                    "count": thread_count,
+                    count=thread_count,
-                    "current_user_participated": participated,
+                    current_user_participated=participated,
-                }
+                )
 
         # Store the bundled aggregations in the event metadata for later use.
         return aggregations
@@ -657,7 +671,7 @@ class RelationsWorkerStore(SQLBaseStore):
         self,
         events: Iterable[EventBase],
         user_id: str,
-    ) -> Dict[str, Dict[str, Any]]:
+    ) -> Dict[str, BundledAggregations]:
         """Generate bundled aggregations for events.
 
         Args:
@@ -668,15 +682,12 @@ class RelationsWorkerStore(SQLBaseStore):
             A map of event ID to the bundled aggregation for the event. Not all
             events may have bundled aggregations in the results.
         """
-        # If bundled aggregations are disabled, nothing to do.
-        if not self._msc1849_enabled:
-            return {}
 
         # TODO Parallelize.
         results = {}
         for event in events:
             event_result = await self._get_bundled_aggregation_for_event(event, user_id)
-            if event_result is not None:
+            if event_result:
                 results[event.event_id] = event_result
 
         return results

synapse/storage/databases/main/signatures.py

@@ -12,16 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import Dict, Iterable, List, Tuple
+from typing import Collection, Dict, List, Tuple
 
 from unpaddedbase64 import encode_base64
 
-from synapse.storage._base import SQLBaseStore
+from synapse.crypto.event_signing import compute_event_reference_hash
-from synapse.storage.types import Cursor
+from synapse.storage.databases.main.events_worker import (
+    EventRedactBehaviour,
+    EventsWorkerStore,
+)
 from synapse.util.caches.descriptors import cached, cachedList
 
 
-class SignatureWorkerStore(SQLBaseStore):
+class SignatureWorkerStore(EventsWorkerStore):
     @cached()
     def get_event_reference_hash(self, event_id):
         # This is a dummy function to allow get_event_reference_hashes
@@ -32,7 +35,7 @@ class SignatureWorkerStore(SQLBaseStore):
         cached_method_name="get_event_reference_hash", list_name="event_ids", num_args=1
     )
     async def get_event_reference_hashes(
-        self, event_ids: Iterable[str]
+        self, event_ids: Collection[str]
     ) -> Dict[str, Dict[str, bytes]]:
         """Get all hashes for given events.
 
@@ -41,18 +44,27 @@ class SignatureWorkerStore(SQLBaseStore):
 
         Returns:
              A mapping of event ID to a mapping of algorithm to hash.
+             Returns an empty dict for a given event id if that event is unknown.
         """
+        events = await self.get_events(
+            event_ids,
+            redact_behaviour=EventRedactBehaviour.AS_IS,
+            allow_rejected=True,
+        )
 
-        def f(txn):
+        hashes: Dict[str, Dict[str, bytes]] = {}
-            return {
+        for event_id in event_ids:
-                event_id: self._get_event_reference_hashes_txn(txn, event_id)
+            event = events.get(event_id)
-                for event_id in event_ids
+            if event is None:
-            }
+                hashes[event_id] = {}
+            else:
+                ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
+                hashes[event_id] = {ref_alg: ref_hash_bytes}
 
-        return await self.db_pool.runInteraction("get_event_reference_hashes", f)
+        return hashes
 
     async def add_event_hashes(
-        self, event_ids: Iterable[str]
+        self, event_ids: Collection[str]
     ) -> List[Tuple[str, Dict[str, str]]]:
         """
 
@@ -70,24 +82,6 @@ class SignatureWorkerStore(SQLBaseStore):
 
         return list(encoded_hashes.items())
 
-    def _get_event_reference_hashes_txn(
-        self, txn: Cursor, event_id: str
-    ) -> Dict[str, bytes]:
-        """Get all the hashes for a given PDU.
-        Args:
-            txn:
-            event_id: Id for the Event.
-        Returns:
-            A mapping of algorithm -> hash.
-        """
-        query = (
-            "SELECT algorithm, hash"
-            " FROM event_reference_hashes"
-            " WHERE event_id = ?"
-        )
-        txn.execute(query, (event_id,))
-        return {k: v for k, v in txn}
-
 
 class SignatureStore(SignatureWorkerStore):
     """Persistence for event signatures and hashes"""

synapse/storage/databases/main/stream.py

@@ -81,6 +81,14 @@ class _EventDictReturn:
     stream_ordering: int
 
 
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class _EventsAround:
+    events_before: List[EventBase]
+    events_after: List[EventBase]
+    start: RoomStreamToken
+    end: RoomStreamToken
+
+
 def generate_pagination_where_clause(
     direction: str,
     column_names: Tuple[str, str],
@@ -846,7 +854,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
         before_limit: int,
         after_limit: int,
         event_filter: Optional[Filter] = None,
-    ) -> dict:
+    ) -> _EventsAround:
         """Retrieve events and pagination tokens around a given event in a
         room.
         """
@@ -869,12 +877,12 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
             list(results["after"]["event_ids"]), get_prev_content=True
         )
 
-        return {
+        return _EventsAround(
-            "events_before": events_before,
+            events_before=events_before,
-            "events_after": events_after,
+            events_after=events_after,
-            "start": results["before"]["token"],
+            start=results["before"]["token"],
-            "end": results["after"]["token"],
+            end=results["after"]["token"],
-        }
+        )
 
     def _get_events_around_txn(
         self,

synapse/storage/databases/main/transactions.py

@@ -561,6 +561,54 @@ class TransactionWorkerStore(CacheInvalidationWorkerStore):
             "get_destinations_paginate_txn", get_destinations_paginate_txn
         )
 
+    async def get_destination_rooms_paginate(
+        self, destination: str, start: int, limit: int, direction: str = "f"
+    ) -> Tuple[List[JsonDict], int]:
+        """Function to retrieve a paginated list of destination's rooms.
+        This will return a json list of rooms and the
+        total number of rooms.
+
+        Args:
+            destination: the destination to query
+            start: start number to begin the query from
+            limit: number of rows to retrieve
+            direction: sort ascending or descending by room_id
+        Returns:
+            A tuple of a dict of rooms and a count of total rooms.
+        """
+
+        def get_destination_rooms_paginate_txn(
+            txn: LoggingTransaction,
+        ) -> Tuple[List[JsonDict], int]:
+
+            if direction == "b":
+                order = "DESC"
+            else:
+                order = "ASC"
+
+            sql = """
+                SELECT COUNT(*) as total_rooms
+                FROM destination_rooms
+                WHERE destination = ?
+                """
+            txn.execute(sql, [destination])
+            count = cast(Tuple[int], txn.fetchone())[0]
+
+            rooms = self.db_pool.simple_select_list_paginate_txn(
+                txn=txn,
+                table="destination_rooms",
+                orderby="room_id",
+                start=start,
+                limit=limit,
+                retcols=("room_id", "stream_ordering"),
+                order_direction=order,
+            )
+            return rooms, count
+
+        return await self.db_pool.runInteraction(
+            "get_destination_rooms_paginate_txn", get_destination_rooms_paginate_txn
+        )
+
     async def is_destination_known(self, destination: str) -> bool:
         """Check if a destination is known to the server."""
         result = await self.db_pool.simple_select_one_onecol(

synapse/storage/engines/_base.py

@@ -12,11 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import abc
-from typing import Generic, TypeVar
+from enum import IntEnum
+from typing import Generic, Optional, TypeVar
 
 from synapse.storage.types import Connection
 
 
+class IsolationLevel(IntEnum):
+    READ_COMMITTED: int = 1
+    REPEATABLE_READ: int = 2
+    SERIALIZABLE: int = 3
+
+
 class IncorrectDatabaseSetup(RuntimeError):
     pass
 
@@ -109,3 +116,13 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
         commit/rollback the connections.
         """
         ...
+
+    @abc.abstractmethod
+    def attempt_to_set_isolation_level(
+        self, conn: Connection, isolation_level: Optional[int]
+    ):
+        """Attempt to set the connections isolation level.
+
+        Note: This has no effect on SQLite3, as transactions are SERIALIZABLE by default.
+        """
+        ...

synapse/storage/engines/postgres.py

@@ -13,8 +13,13 @@
 # limitations under the License.
 
 import logging
+from typing import Mapping, Optional
 
-from synapse.storage.engines._base import BaseDatabaseEngine, IncorrectDatabaseSetup
+from synapse.storage.engines._base import (
+    BaseDatabaseEngine,
+    IncorrectDatabaseSetup,
+    IsolationLevel,
+)
 from synapse.storage.types import Connection
 
 logger = logging.getLogger(__name__)
@@ -34,6 +39,15 @@ class PostgresEngine(BaseDatabaseEngine):
         self.synchronous_commit = database_config.get("synchronous_commit", True)
         self._version = None  # unknown as yet
 
+        self.isolation_level_map: Mapping[int, int] = {
+            IsolationLevel.READ_COMMITTED: self.module.extensions.ISOLATION_LEVEL_READ_COMMITTED,
+            IsolationLevel.REPEATABLE_READ: self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ,
+            IsolationLevel.SERIALIZABLE: self.module.extensions.ISOLATION_LEVEL_SERIALIZABLE,
+        }
+        self.default_isolation_level = (
+            self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
+        )
+
     @property
     def single_threaded(self) -> bool:
         return False
@@ -46,8 +60,8 @@ class PostgresEngine(BaseDatabaseEngine):
         self._version = db_conn.server_version
 
         # Are we on a supported PostgreSQL version?
-        if not allow_outdated_version and self._version < 90600:
+        if not allow_outdated_version and self._version < 100000:
-            raise RuntimeError("Synapse requires PostgreSQL 9.6 or above.")
+            raise RuntimeError("Synapse requires PostgreSQL 10 or above.")
 
         with db_conn.cursor() as txn:
             txn.execute("SHOW SERVER_ENCODING")
@@ -104,9 +118,7 @@ class PostgresEngine(BaseDatabaseEngine):
         return sql.replace("?", "%s")
 
     def on_new_connection(self, db_conn):
-        db_conn.set_isolation_level(
+        db_conn.set_isolation_level(self.default_isolation_level)
-            self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
-        )
 
         # Set the bytea output to escape, vs the default of hex
         cursor = db_conn.cursor()
@@ -175,3 +187,12 @@ class PostgresEngine(BaseDatabaseEngine):
 
     def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
         return conn.set_session(autocommit=autocommit)  # type: ignore
+
+    def attempt_to_set_isolation_level(
+        self, conn: Connection, isolation_level: Optional[int]
+    ):
+        if isolation_level is None:
+            isolation_level = self.default_isolation_level
+        else:
+            isolation_level = self.isolation_level_map[isolation_level]
+        return conn.set_isolation_level(isolation_level)  # type: ignore

synapse/storage/engines/sqlite.py

@@ -15,6 +15,7 @@ import platform
 import struct
 import threading
 import typing
+from typing import Optional
 
 from synapse.storage.engines import BaseDatabaseEngine
 from synapse.storage.types import Connection
@@ -122,6 +123,12 @@ class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
         # set the connection to autocommit mode.
         pass
 
+    def attempt_to_set_isolation_level(
+        self, conn: Connection, isolation_level: Optional[int]
+    ):
+        # All transactions are SERIALIZABLE by default in sqllite
+        pass
+
 
 # Following functions taken from: https://github.com/coleifer/peewee
 

synapse/storage/prepare_database.py

@@ -499,9 +499,12 @@ def _upgrade_existing_database(
                 module = importlib.util.module_from_spec(spec)
                 spec.loader.exec_module(module)  # type: ignore
 
-                logger.info("Running script %s", relative_path)
+                if hasattr(module, "run_create"):
-                module.run_create(cur, database_engine)  # type: ignore
+                    logger.info("Running %s:run_create", relative_path)
-                if not is_empty:
+                    module.run_create(cur, database_engine)  # type: ignore
+
+                if not is_empty and hasattr(module, "run_upgrade"):
+                    logger.info("Running %s:run_upgrade", relative_path)
                     module.run_upgrade(cur, database_engine, config=config)  # type: ignore
             elif ext == ".pyc" or file_name == "__pycache__":
                 # Sometimes .pyc files turn up anyway even though we've

synapse/storage/schema/__init__.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-SCHEMA_VERSION = 67  # remember to update the list below when updating
+SCHEMA_VERSION = 68  # remember to update the list below when updating
 """Represents the expectations made by the codebase about the database schema
 
 This should be incremented whenever the codebase changes its requirements on the
@@ -53,11 +53,18 @@ Changes in SCHEMA_VERSION = 66:
 
 Changes in SCHEMA_VERSION = 67:
     - state_events.prev_state is no longer written to.
+
+Changes in SCHEMA_VERSION = 68:
+    - event_reference_hashes is no longer read.
+    - `events` has `state_key` and `rejection_reason` columns, which are populated for
+      new events.
 """
 
 
 SCHEMA_COMPAT_VERSION = (
-    61  # 61: Remove unused tables `user_stats_historical` and `room_stats_historical`
+    # we now have `state_key` columns in both `events` and `state_events`, so
+    # now incompatible with synapses wth SCHEMA_VERSION < 66.
+    66
 )
 """Limit on how far the synapse codebase can be rolled back without breaking db compat
 

synapse/storage/schema/main/delta/67/01drop_public_room_list_stream.sql

@@ -0,0 +1,18 @@
+/* Copyright 2022 The Matrix.org Foundation C.I.C
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- this table is unused as of Synapse 1.41
+DROP TABLE public_room_list_stream;
+

synapse/storage/schema/main/delta/68/01event_columns.sql

@@ -0,0 +1,26 @@
+/* Copyright 2022 The Matrix.org Foundation C.I.C
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- Add new colums to the `events` table which will (one day) make the `state_events`
+-- and `rejections` tables redundant.
+
+ALTER TABLE events
+  -- if this event is a state event, its state key
+  ADD COLUMN state_key TEXT DEFAULT NULL;
+
+
+ALTER TABLE events
+  -- if this event was rejected, the reason it was rejected.
+  ADD COLUMN rejection_reason TEXT DEFAULT NULL;

synapse/storage/state.py

@@ -74,21 +74,21 @@ class StateFilter:
 
     @staticmethod
     def all() -> "StateFilter":
-        """Creates a filter that fetches everything.
+        """Returns a filter that fetches everything.
 
         Returns:
-            The new state filter.
+            The state filter.
         """
-        return StateFilter(types=frozendict(), include_others=True)
+        return _ALL_STATE_FILTER
 
     @staticmethod
     def none() -> "StateFilter":
-        """Creates a filter that fetches nothing.
+        """Returns a filter that fetches nothing.
 
         Returns:
             The new state filter.
         """
-        return StateFilter(types=frozendict(), include_others=False)
+        return _NONE_STATE_FILTER
 
     @staticmethod
     def from_types(types: Iterable[Tuple[str, Optional[str]]]) -> "StateFilter":
@@ -527,6 +527,10 @@ class StateFilter:
         )
 
 
+_ALL_STATE_FILTER = StateFilter(types=frozendict(), include_others=True)
+_NONE_STATE_FILTER = StateFilter(types=frozendict(), include_others=False)
+
+
 class StateGroupStorage:
     """High level interface to fetching state for event."""
 

synapse/visibility.py

@@ -87,7 +87,7 @@ async def filter_events_for_client(
     )
 
     ignore_dict_content = await storage.main.get_global_account_data_by_type_for_user(
-        AccountDataTypes.IGNORED_USER_LIST, user_id
+        user_id, AccountDataTypes.IGNORED_USER_LIST
     )
 
     ignore_list: FrozenSet[str] = frozenset()

tests/handlers/test_deactivate_account.py

@@ -0,0 +1,219 @@
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from http import HTTPStatus
+from typing import Any, Dict
+
+from twisted.test.proto_helpers import MemoryReactor
+
+from synapse.api.constants import AccountDataTypes
+from synapse.push.rulekinds import PRIORITY_CLASS_MAP
+from synapse.rest import admin
+from synapse.rest.client import account, login
+from synapse.server import HomeServer
+from synapse.util import Clock
+
+from tests.unittest import HomeserverTestCase
+
+
+class DeactivateAccountTestCase(HomeserverTestCase):
+    servlets = [
+        login.register_servlets,
+        admin.register_servlets,
+        account.register_servlets,
+    ]
+
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+        self._store = hs.get_datastore()
+
+        self.user = self.register_user("user", "pass")
+        self.token = self.login("user", "pass")
+
+    def _deactivate_my_account(self):
+        """
+        Deactivates the account `self.user` using `self.token` and asserts
+        that it returns a 200 success code.
+        """
+        req = self.get_success(
+            self.make_request(
+                "POST",
+                "account/deactivate",
+                {
+                    "auth": {
+                        "type": "m.login.password",
+                        "user": self.user,
+                        "password": "pass",
+                    },
+                    "erase": True,
+                },
+                access_token=self.token,
+            )
+        )
+        self.assertEqual(req.code, HTTPStatus.OK, req)
+
+    def test_global_account_data_deleted_upon_deactivation(self) -> None:
+        """
+        Tests that global account data is removed upon deactivation.
+        """
+        # Add some account data
+        self.get_success(
+            self._store.add_account_data_for_user(
+                self.user,
+                AccountDataTypes.DIRECT,
+                {"@someone:remote": ["!somewhere:remote"]},
+            )
+        )
+
+        # Check that we actually added some.
+        self.assertIsNotNone(
+            self.get_success(
+                self._store.get_global_account_data_by_type_for_user(
+                    self.user, AccountDataTypes.DIRECT
+                )
+            ),
+        )
+
+        # Request the deactivation of our account
+        self._deactivate_my_account()
+
+        # Check that the account data does not persist.
+        self.assertIsNone(
+            self.get_success(
+                self._store.get_global_account_data_by_type_for_user(
+                    self.user, AccountDataTypes.DIRECT
+                )
+            ),
+        )
+
+    def test_room_account_data_deleted_upon_deactivation(self) -> None:
+        """
+        Tests that room account data is removed upon deactivation.
+        """
+        room_id = "!room:test"
+
+        # Add some room account data
+        self.get_success(
+            self._store.add_account_data_to_room(
+                self.user,
+                room_id,
+                "m.fully_read",
+                {"event_id": "$aaaa:test"},
+            )
+        )
+
+        # Check that we actually added some.
+        self.assertIsNotNone(
+            self.get_success(
+                self._store.get_account_data_for_room_and_type(
+                    self.user, room_id, "m.fully_read"
+                )
+            ),
+        )
+
+        # Request the deactivation of our account
+        self._deactivate_my_account()
+
+        # Check that the account data does not persist.
+        self.assertIsNone(
+            self.get_success(
+                self._store.get_account_data_for_room_and_type(
+                    self.user, room_id, "m.fully_read"
+                )
+            ),
+        )
+
+    def _is_custom_rule(self, push_rule: Dict[str, Any]) -> bool:
+        """
+        Default rules start with a dot: such as .m.rule and .im.vector.
+        This function returns true iff a rule is custom (not default).
+        """
+        return "/." not in push_rule["rule_id"]
+
+    def test_push_rules_deleted_upon_account_deactivation(self) -> None:
+        """
+        Push rules are a special case of account data.
+        They are stored separately but get sent to the client as account data in /sync.
+        This tests that deactivating a user deletes push rules along with the rest
+        of their account data.
+        """
+
+        # Add a push rule
+        self.get_success(
+            self._store.add_push_rule(
+                self.user,
+                "personal.override.rule1",
+                PRIORITY_CLASS_MAP["override"],
+                [],
+                [],
+            )
+        )
+
+        # Test the rule exists
+        push_rules = self.get_success(self._store.get_push_rules_for_user(self.user))
+        # Filter out default rules; we don't care
+        push_rules = list(filter(self._is_custom_rule, push_rules))
+        # Check our rule made it
+        self.assertEqual(
+            push_rules,
+            [
+                {
+                    "user_name": "@user:test",
+                    "rule_id": "personal.override.rule1",
+                    "priority_class": 5,
+                    "priority": 0,
+                    "conditions": [],
+                    "actions": [],
+                    "default": False,
+                }
+            ],
+            push_rules,
+        )
+
+        # Request the deactivation of our account
+        self._deactivate_my_account()
+
+        push_rules = self.get_success(self._store.get_push_rules_for_user(self.user))
+        # Filter out default rules; we don't care
+        push_rules = list(filter(self._is_custom_rule, push_rules))
+        # Check our rule no longer exists
+        self.assertEqual(push_rules, [], push_rules)
+
+    def test_ignored_users_deleted_upon_deactivation(self) -> None:
+        """
+        Ignored users are a special case of account data.
+        They get denormalised into the `ignored_users` table upon being stored as
+        account data.
+        Test that a user's list of ignored users is deleted upon deactivation.
+        """
+
+        # Add an ignored user
+        self.get_success(
+            self._store.add_account_data_for_user(
+                self.user,
+                AccountDataTypes.IGNORED_USER_LIST,
+                {"ignored_users": {"@sheltie:test": {}}},
+            )
+        )
+
+        # Test the user is ignored
+        self.assertEqual(
+            self.get_success(self._store.ignored_by("@sheltie:test")), {self.user}
+        )
+
+        # Request the deactivation of our account
+        self._deactivate_my_account()
+
+        # Test the user is no longer ignored by the user that was deactivated
+        self.assertEqual(
+            self.get_success(self._store.ignored_by("@sheltie:test")), set()
+        )

tests/handlers/test_password_providers.py

@@ -20,10 +20,11 @@ from unittest.mock import Mock
 from twisted.internet import defer
 
 import synapse
+from synapse.api.constants import LoginType
 from synapse.handlers.auth import load_legacy_password_auth_providers
 from synapse.module_api import ModuleApi
-from synapse.rest.client import devices, login, logout
+from synapse.rest.client import devices, login, logout, register
-from synapse.types import JsonDict
+from synapse.types import JsonDict, UserID
 
 from tests import unittest
 from tests.server import FakeChannel
@@ -156,6 +157,7 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         login.register_servlets,
         devices.register_servlets,
         logout.register_servlets,
+        register.register_servlets,
     ]
 
     def setUp(self):
@@ -745,6 +747,79 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         on_logged_out.assert_called_once()
         self.assertTrue(self.called)
 
+    def test_username(self):
+        """Tests that the get_username_for_registration callback can define the username
+        of a user when registering.
+        """
+        self._setup_get_username_for_registration()
+
+        username = "rin"
+        channel = self.make_request(
+            "POST",
+            "/register",
+            {
+                "username": username,
+                "password": "bar",
+                "auth": {"type": LoginType.DUMMY},
+            },
+        )
+        self.assertEqual(channel.code, 200)
+
+        # Our callback takes the username and appends "-foo" to it, check that's what we
+        # have.
+        mxid = channel.json_body["user_id"]
+        self.assertEqual(UserID.from_string(mxid).localpart, username + "-foo")
+
+    def test_username_uia(self):
+        """Tests that the get_username_for_registration callback is only called at the
+        end of the UIA flow.
+        """
+        m = self._setup_get_username_for_registration()
+
+        # Initiate the UIA flow.
+        username = "rin"
+        channel = self.make_request(
+            "POST",
+            "register",
+            {"username": username, "type": "m.login.password", "password": "bar"},
+        )
+        self.assertEqual(channel.code, 401)
+        self.assertIn("session", channel.json_body)
+
+        # Check that the callback hasn't been called yet.
+        m.assert_not_called()
+
+        # Finish the UIA flow.
+        session = channel.json_body["session"]
+        channel = self.make_request(
+            "POST",
+            "register",
+            {"auth": {"session": session, "type": LoginType.DUMMY}},
+        )
+        self.assertEqual(channel.code, 200, channel.json_body)
+        mxid = channel.json_body["user_id"]
+        self.assertEqual(UserID.from_string(mxid).localpart, username + "-foo")
+
+        # Check that the callback has been called.
+        m.assert_called_once()
+
+    def _setup_get_username_for_registration(self) -> Mock:
+        """Registers a get_username_for_registration callback that appends "-foo" to the
+        username the client is trying to register.
+        """
+
+        async def get_username_for_registration(uia_results, params):
+            self.assertIn(LoginType.DUMMY, uia_results)
+            username = params["username"]
+            return username + "-foo"
+
+        m = Mock(side_effect=get_username_for_registration)
+
+        password_auth_provider = self.hs.get_password_auth_provider()
+        password_auth_provider.get_username_for_registration_callbacks.append(m)
+
+        return m
+
     def _get_login_flows(self) -> JsonDict:
         channel = self.make_request("GET", "/_matrix/client/r0/login")
         self.assertEqual(channel.code, 200, channel.result)

tests/handlers/test_profile.py

@@ -11,12 +11,13 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+from typing import Any, Dict
 from unittest.mock import Mock
 
 import synapse.types
 from synapse.api.errors import AuthError, SynapseError
 from synapse.rest import admin
+from synapse.server import HomeServer
 from synapse.types import UserID
 
 from tests import unittest
@@ -46,7 +47,7 @@ class ProfileTestCase(unittest.HomeserverTestCase):
         )
         return hs
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor, clock, hs: HomeServer):
         self.store = hs.get_datastore()
 
         self.frank = UserID.from_string("@1234abcd:test")
@@ -248,3 +249,92 @@ class ProfileTestCase(unittest.HomeserverTestCase):
             ),
             SynapseError,
         )
+
+    def test_avatar_constraints_no_config(self):
+        """Tests that the method to check an avatar against configured constraints skips
+        all of its check if no constraint is configured.
+        """
+        # The first check that's done by this method is whether the file exists; if we
+        # don't get an error on a non-existing file then it means all of the checks were
+        # successfully skipped.
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/unknown_file")
+        )
+        self.assertTrue(res)
+
+    @unittest.override_config({"max_avatar_size": 50})
+    def test_avatar_constraints_missing(self):
+        """Tests that an avatar isn't allowed if the file at the given MXC URI couldn't
+        be found.
+        """
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/unknown_file")
+        )
+        self.assertFalse(res)
+
+    @unittest.override_config({"max_avatar_size": 50})
+    def test_avatar_constraints_file_size(self):
+        """Tests that a file that's above the allowed file size is forbidden but one
+        that's below it is allowed.
+        """
+        self._setup_local_files(
+            {
+                "small": {"size": 40},
+                "big": {"size": 60},
+            }
+        )
+
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/small")
+        )
+        self.assertTrue(res)
+
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/big")
+        )
+        self.assertFalse(res)
+
+    @unittest.override_config({"allowed_avatar_mimetypes": ["image/png"]})
+    def test_avatar_constraint_mime_type(self):
+        """Tests that a file with an unauthorised MIME type is forbidden but one with
+        an authorised content type is allowed.
+        """
+        self._setup_local_files(
+            {
+                "good": {"mimetype": "image/png"},
+                "bad": {"mimetype": "application/octet-stream"},
+            }
+        )
+
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/good")
+        )
+        self.assertTrue(res)
+
+        res = self.get_success(
+            self.handler.check_avatar_size_and_mime_type("mxc://test/bad")
+        )
+        self.assertFalse(res)
+
+    def _setup_local_files(self, names_and_props: Dict[str, Dict[str, Any]]):
+        """Stores metadata about files in the database.
+
+        Args:
+            names_and_props: A dictionary with one entry per file, with the key being the
+                file's name, and the value being a dictionary of properties. Supported
+                properties are "mimetype" (for the file's type) and "size" (for the
+                file's size).
+        """
+        store = self.hs.get_datastore()
+
+        for name, props in names_and_props.items():
+            self.get_success(
+                store.store_local_media(
+                    media_id=name,
+                    media_type=props.get("mimetype", "image/png"),
+                    time_now_ms=self.clock.time_msec(),
+                    upload_name=None,
+                    media_length=props.get("size", 50),
+                    user_id=UserID.from_string("@rin:test"),
+                )
+            )

tests/replication/slave/storage/test_account_data.py

@@ -30,7 +30,7 @@ class SlavedAccountDataStoreTestCase(BaseSlavedStoreTestCase):
         )
         self.replicate()
         self.check(
-            "get_global_account_data_by_type_for_user", [TYPE, USER_ID], {"a": 1}
+            "get_global_account_data_by_type_for_user", [USER_ID, TYPE], {"a": 1}
         )
 
         self.get_success(
@@ -38,5 +38,5 @@ class SlavedAccountDataStoreTestCase(BaseSlavedStoreTestCase):
         )
         self.replicate()
         self.check(
-            "get_global_account_data_by_type_for_user", [TYPE, USER_ID], {"a": 2}
+            "get_global_account_data_by_type_for_user", [USER_ID, TYPE], {"a": 2}
         )

tests/rest/admin/test_admin.py

@@ -12,18 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import urllib.parse
 from http import HTTPStatus
-from unittest.mock import Mock
+from typing import List
 
-from twisted.internet.defer import Deferred
+from parameterized import parameterized
+
+from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 from synapse.http.server import JsonResource
-from synapse.logging.context import make_deferred_yieldable
 from synapse.rest.admin import VersionServlet
 from synapse.rest.client import groups, login, room
+from synapse.server import HomeServer
+from synapse.util import Clock
 
 from tests import unittest
 from tests.server import FakeSite, make_request
@@ -33,12 +35,12 @@ from tests.test_utils import SMALL_PNG
 class VersionTestCase(unittest.HomeserverTestCase):
     url = "/_synapse/admin/v1/server_version"
 
-    def create_test_resource(self):
+    def create_test_resource(self) -> JsonResource:
         resource = JsonResource(self.hs)
         VersionServlet(self.hs).register(resource)
         return resource
 
-    def test_version_string(self):
+    def test_version_string(self) -> None:
         channel = self.make_request("GET", self.url, shorthand=False)
 
         self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
@@ -54,14 +56,14 @@ class DeleteGroupTestCase(unittest.HomeserverTestCase):
         groups.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.admin_user = self.register_user("admin", "pass", admin=True)
         self.admin_user_tok = self.login("admin", "pass")
 
         self.other_user = self.register_user("user", "pass")
         self.other_user_token = self.login("user", "pass")
 
-    def test_delete_group(self):
+    def test_delete_group(self) -> None:
         # Create a new group
         channel = self.make_request(
             "POST",
@@ -112,7 +114,7 @@ class DeleteGroupTestCase(unittest.HomeserverTestCase):
         self.assertNotIn(group_id, self._get_groups_user_is_in(self.admin_user_tok))
         self.assertNotIn(group_id, self._get_groups_user_is_in(self.other_user_token))
 
-    def _check_group(self, group_id, expect_code):
+    def _check_group(self, group_id: str, expect_code: int) -> None:
         """Assert that trying to fetch the given group results in the given
         HTTP status code
         """
@@ -124,7 +126,7 @@ class DeleteGroupTestCase(unittest.HomeserverTestCase):
 
         self.assertEqual(expect_code, channel.code, msg=channel.json_body)
 
-    def _get_groups_user_is_in(self, access_token):
+    def _get_groups_user_is_in(self, access_token: str) -> List[str]:
         """Returns the list of groups the user is in (given their access token)"""
         channel = self.make_request("GET", b"/joined_groups", access_token=access_token)
 
@@ -143,59 +145,15 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         # Allow for uploading and downloading to/from the media repo
         self.media_repo = hs.get_media_repository_resource()
         self.download_resource = self.media_repo.children[b"download"]
         self.upload_resource = self.media_repo.children[b"upload"]
 
-    def make_homeserver(self, reactor, clock):
+    def _ensure_quarantined(
-
+        self, admin_user_tok: str, server_and_media_id: str
-        self.fetches = []
+    ) -> None:
-
-        async def get_file(destination, path, output_stream, args=None, max_size=None):
-            """
-            Returns tuple[int,dict,str,int] of file length, response headers,
-            absolute URI, and response code.
-            """
-
-            def write_to(r):
-                data, response = r
-                output_stream.write(data)
-                return response
-
-            d = Deferred()
-            d.addCallback(write_to)
-            self.fetches.append((d, destination, path, args))
-            return await make_deferred_yieldable(d)
-
-        client = Mock()
-        client.get_file = get_file
-
-        self.storage_path = self.mktemp()
-        self.media_store_path = self.mktemp()
-        os.mkdir(self.storage_path)
-        os.mkdir(self.media_store_path)
-
-        config = self.default_config()
-        config["media_store_path"] = self.media_store_path
-        config["thumbnail_requirements"] = {}
-        config["max_image_pixels"] = 2000000
-
-        provider_config = {
-            "module": "synapse.rest.media.v1.storage_provider.FileStorageProviderBackend",
-            "store_local": True,
-            "store_synchronous": False,
-            "store_remote": True,
-            "config": {"directory": self.storage_path},
-        }
-        config["media_storage_providers"] = [provider_config]
-
-        hs = self.setup_test_homeserver(config=config, federation_http_client=client)
-
-        return hs
-
-    def _ensure_quarantined(self, admin_user_tok, server_and_media_id):
         """Ensure a piece of media is quarantined when trying to access it."""
         channel = make_request(
             self.reactor,
@@ -216,12 +174,18 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
             ),
         )
 
-    def test_quarantine_media_requires_admin(self):
+    @parameterized.expand(
+        [
+            # Attempt quarantine media APIs as non-admin
+            "/_synapse/admin/v1/media/quarantine/example.org/abcde12345",
+            # And the roomID/userID endpoint
+            "/_synapse/admin/v1/room/!room%3Aexample.com/media/quarantine",
+        ]
+    )
+    def test_quarantine_media_requires_admin(self, url: str) -> None:
         self.register_user("nonadmin", "pass", admin=False)
         non_admin_user_tok = self.login("nonadmin", "pass")
 
-        # Attempt quarantine media APIs as non-admin
-        url = "/_synapse/admin/v1/media/quarantine/example.org/abcde12345"
         channel = self.make_request(
             "POST",
             url.encode("ascii"),
@@ -235,22 +199,7 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
             msg="Expected forbidden on quarantining media as a non-admin",
         )
 
-        # And the roomID/userID endpoint
+    def test_quarantine_media_by_id(self) -> None:
-        url = "/_synapse/admin/v1/room/!room%3Aexample.com/media/quarantine"
-        channel = self.make_request(
-            "POST",
-            url.encode("ascii"),
-            access_token=non_admin_user_tok,
-        )
-
-        # Expect a forbidden error
-        self.assertEqual(
-            HTTPStatus.FORBIDDEN,
-            channel.code,
-            msg="Expected forbidden on quarantining media as a non-admin",
-        )
-
-    def test_quarantine_media_by_id(self):
         self.register_user("id_admin", "pass", admin=True)
         admin_user_tok = self.login("id_admin", "pass")
 
@@ -295,7 +244,15 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
         # Attempt to access the media
         self._ensure_quarantined(admin_user_tok, server_name_and_media_id)
 
-    def test_quarantine_all_media_in_room(self, override_url_template=None):
+    @parameterized.expand(
+        [
+            # regular API path
+            "/_synapse/admin/v1/room/%s/media/quarantine",
+            # deprecated API path
+            "/_synapse/admin/v1/quarantine_media/%s",
+        ]
+    )
+    def test_quarantine_all_media_in_room(self, url: str) -> None:
         self.register_user("room_admin", "pass", admin=True)
         admin_user_tok = self.login("room_admin", "pass")
 
@@ -333,16 +290,9 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
             tok=non_admin_user_tok,
         )
 
-        # Quarantine all media in the room
-        if override_url_template:
-            url = override_url_template % urllib.parse.quote(room_id)
-        else:
-            url = "/_synapse/admin/v1/room/%s/media/quarantine" % urllib.parse.quote(
-                room_id
-            )
         channel = self.make_request(
             "POST",
-            url,
+            url % urllib.parse.quote(room_id),
             access_token=admin_user_tok,
         )
         self.pump(1.0)
@@ -359,11 +309,7 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
         self._ensure_quarantined(admin_user_tok, server_and_media_id_1)
         self._ensure_quarantined(admin_user_tok, server_and_media_id_2)
 
-    def test_quarantine_all_media_in_room_deprecated_api_path(self):
+    def test_quarantine_all_media_by_user(self) -> None:
-        # Perform the above test with the deprecated API path
-        self.test_quarantine_all_media_in_room("/_synapse/admin/v1/quarantine_media/%s")
-
-    def test_quarantine_all_media_by_user(self):
         self.register_user("user_admin", "pass", admin=True)
         admin_user_tok = self.login("user_admin", "pass")
 
@@ -401,7 +347,7 @@ class QuarantineMediaTestCase(unittest.HomeserverTestCase):
         self._ensure_quarantined(admin_user_tok, server_and_media_id_1)
         self._ensure_quarantined(admin_user_tok, server_and_media_id_2)
 
-    def test_cannot_quarantine_safe_media(self):
+    def test_cannot_quarantine_safe_media(self) -> None:
         self.register_user("user_admin", "pass", admin=True)
         admin_user_tok = self.login("user_admin", "pass")
 
@@ -475,7 +421,7 @@ class PurgeHistoryTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.admin_user = self.register_user("admin", "pass", admin=True)
         self.admin_user_tok = self.login("admin", "pass")
 
@@ -488,7 +434,7 @@ class PurgeHistoryTestCase(unittest.HomeserverTestCase):
         self.url = f"/_synapse/admin/v1/purge_history/{self.room_id}"
         self.url_status = "/_synapse/admin/v1/purge_history_status/"
 
-    def test_purge_history(self):
+    def test_purge_history(self) -> None:
         """
         Simple test of purge history API.
         Test only that is is possible to call, get status HTTPStatus.OK and purge_id.

tests/rest/admin/test_federation.py

@@ -20,7 +20,7 @@ from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 from synapse.api.errors import Codes
-from synapse.rest.client import login
+from synapse.rest.client import login, room
 from synapse.server import HomeServer
 from synapse.types import JsonDict
 from synapse.util import Clock
@@ -43,20 +43,22 @@ class FederationTestCase(unittest.HomeserverTestCase):
 
     @parameterized.expand(
         [
-            ("/_synapse/admin/v1/federation/destinations",),
+            ("GET", "/_synapse/admin/v1/federation/destinations"),
-            ("/_synapse/admin/v1/federation/destinations/dummy",),
+            ("GET", "/_synapse/admin/v1/federation/destinations/dummy"),
+            (
+                "POST",
+                "/_synapse/admin/v1/federation/destinations/dummy/reset_connection",
+            ),
         ]
     )
-    def test_requester_is_no_admin(self, url: str) -> None:
+    def test_requester_is_no_admin(self, method: str, url: str) -> None:
-        """
+        """If the user is not a server admin, an error 403 is returned."""
-        If the user is not a server admin, an error 403 is returned.
-        """
 
         self.register_user("user", "pass", admin=False)
         other_user_tok = self.login("user", "pass")
 
         channel = self.make_request(
-            "GET",
+            method,
             url,
             content={},
             access_token=other_user_tok,
@@ -66,9 +68,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])
 
     def test_invalid_parameter(self) -> None:
-        """
+        """If parameters are invalid, an error is returned."""
-        If parameters are invalid, an error is returned.
-        """
 
         # negative limit
         channel = self.make_request(
@@ -120,10 +120,18 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self.assertEqual(HTTPStatus.NOT_FOUND, channel.code, msg=channel.json_body)
         self.assertEqual(Codes.NOT_FOUND, channel.json_body["errcode"])
 
+        # invalid destination
+        channel = self.make_request(
+            "POST",
+            self.url + "/dummy/reset_connection",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.NOT_FOUND, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.NOT_FOUND, channel.json_body["errcode"])
+
     def test_limit(self) -> None:
-        """
+        """Testing list of destinations with limit"""
-        Testing list of destinations with limit
-        """
 
         number_destinations = 20
         self._create_destinations(number_destinations)
@@ -141,9 +149,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self._check_fields(channel.json_body["destinations"])
 
     def test_from(self) -> None:
-        """
+        """Testing list of destinations with a defined starting point (from)"""
-        Testing list of destinations with a defined starting point (from)
-        """
 
         number_destinations = 20
         self._create_destinations(number_destinations)
@@ -161,9 +167,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self._check_fields(channel.json_body["destinations"])
 
     def test_limit_and_from(self) -> None:
-        """
+        """Testing list of destinations with a defined starting point and limit"""
-        Testing list of destinations with a defined starting point and limit
-        """
 
         number_destinations = 20
         self._create_destinations(number_destinations)
@@ -181,9 +185,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self._check_fields(channel.json_body["destinations"])
 
     def test_next_token(self) -> None:
-        """
+        """Testing that `next_token` appears at the right place"""
-        Testing that `next_token` appears at the right place
-        """
 
         number_destinations = 20
         self._create_destinations(number_destinations)
@@ -242,9 +244,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self.assertNotIn("next_token", channel.json_body)
 
     def test_list_all_destinations(self) -> None:
-        """
+        """List all destinations."""
-        List all destinations.
-        """
         number_destinations = 5
         self._create_destinations(number_destinations)
 
@@ -263,9 +263,7 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self._check_fields(channel.json_body["destinations"])
 
     def test_order_by(self) -> None:
-        """
+        """Testing order list with parameter `order_by`"""
-        Testing order list with parameter `order_by`
-        """
 
         def _order_test(
             expected_destination_list: List[str],
@@ -444,6 +442,39 @@ class FederationTestCase(unittest.HomeserverTestCase):
         self.assertIsNone(channel.json_body["failure_ts"])
         self.assertIsNone(channel.json_body["last_successful_stream_ordering"])
 
+    def test_destination_reset_connection(self) -> None:
+        """Reset timeouts and wake up destination."""
+        self._create_destination("sub0.example.com", 100, 100, 100)
+
+        channel = self.make_request(
+            "POST",
+            self.url + "/sub0.example.com/reset_connection",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+
+        retry_timings = self.get_success(
+            self.store.get_destination_retry_timings("sub0.example.com")
+        )
+        self.assertIsNone(retry_timings)
+
+    def test_destination_reset_connection_not_required(self) -> None:
+        """Try to reset timeouts of a destination with no timeouts and get an error."""
+        self._create_destination("sub0.example.com", None, 0, 0)
+
+        channel = self.make_request(
+            "POST",
+            self.url + "/sub0.example.com/reset_connection",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.BAD_REQUEST, channel.code, msg=channel.json_body)
+        self.assertEqual(
+            "The retry timing does not need to be reset for this destination.",
+            channel.json_body["error"],
+        )
+
     def _create_destination(
         self,
         destination: str,
@@ -496,3 +527,271 @@ class FederationTestCase(unittest.HomeserverTestCase):
             self.assertIn("retry_interval", c)
             self.assertIn("failure_ts", c)
             self.assertIn("last_successful_stream_ordering", c)
+
+
+class DestinationMembershipTestCase(unittest.HomeserverTestCase):
+    servlets = [
+        synapse.rest.admin.register_servlets,
+        login.register_servlets,
+        room.register_servlets,
+    ]
+
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+        self.store = hs.get_datastore()
+        self.admin_user = self.register_user("admin", "pass", admin=True)
+        self.admin_user_tok = self.login("admin", "pass")
+
+        self.dest = "sub0.example.com"
+        self.url = f"/_synapse/admin/v1/federation/destinations/{self.dest}/rooms"
+
+        # Record that we successfully contacted a destination in the DB.
+        self.get_success(
+            self.store.set_destination_retry_timings(self.dest, None, 0, 0)
+        )
+
+    def test_requester_is_no_admin(self) -> None:
+        """If the user is not a server admin, an error 403 is returned."""
+
+        self.register_user("user", "pass", admin=False)
+        other_user_tok = self.login("user", "pass")
+
+        channel = self.make_request(
+            "GET",
+            self.url,
+            access_token=other_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.FORBIDDEN, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])
+
+    def test_invalid_parameter(self) -> None:
+        """If parameters are invalid, an error is returned."""
+
+        # negative limit
+        channel = self.make_request(
+            "GET",
+            self.url + "?limit=-5",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.BAD_REQUEST, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])
+
+        # negative from
+        channel = self.make_request(
+            "GET",
+            self.url + "?from=-5",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.BAD_REQUEST, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])
+
+        # invalid search order
+        channel = self.make_request(
+            "GET",
+            self.url + "?dir=bar",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.BAD_REQUEST, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])
+
+        # invalid destination
+        channel = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/federation/destinations/%s/rooms" % ("invalid",),
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.NOT_FOUND, channel.code, msg=channel.json_body)
+        self.assertEqual(Codes.NOT_FOUND, channel.json_body["errcode"])
+
+    def test_limit(self) -> None:
+        """Testing list of destinations with limit"""
+
+        number_rooms = 5
+        self._create_destination_rooms(number_rooms)
+
+        channel = self.make_request(
+            "GET",
+            self.url + "?limit=3",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), 3)
+        self.assertEqual(channel.json_body["next_token"], "3")
+        self._check_fields(channel.json_body["rooms"])
+
+    def test_from(self) -> None:
+        """Testing list of rooms with a defined starting point (from)"""
+
+        number_rooms = 10
+        self._create_destination_rooms(number_rooms)
+
+        channel = self.make_request(
+            "GET",
+            self.url + "?from=5",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), 5)
+        self.assertNotIn("next_token", channel.json_body)
+        self._check_fields(channel.json_body["rooms"])
+
+    def test_limit_and_from(self) -> None:
+        """Testing list of rooms with a defined starting point and limit"""
+
+        number_rooms = 10
+        self._create_destination_rooms(number_rooms)
+
+        channel = self.make_request(
+            "GET",
+            self.url + "?from=3&limit=5",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(channel.json_body["next_token"], "8")
+        self.assertEqual(len(channel.json_body["rooms"]), 5)
+        self._check_fields(channel.json_body["rooms"])
+
+    def test_order_direction(self) -> None:
+        """Testing order list with parameter `dir`"""
+        number_rooms = 4
+        self._create_destination_rooms(number_rooms)
+
+        # get list in forward direction
+        channel_asc = self.make_request(
+            "GET",
+            self.url + "?dir=f",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel_asc.code, msg=channel_asc.json_body)
+        self.assertEqual(channel_asc.json_body["total"], number_rooms)
+        self.assertEqual(number_rooms, len(channel_asc.json_body["rooms"]))
+        self._check_fields(channel_asc.json_body["rooms"])
+
+        # get list in backward direction
+        channel_desc = self.make_request(
+            "GET",
+            self.url + "?dir=b",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel_desc.code, msg=channel_desc.json_body)
+        self.assertEqual(channel_desc.json_body["total"], number_rooms)
+        self.assertEqual(number_rooms, len(channel_desc.json_body["rooms"]))
+        self._check_fields(channel_desc.json_body["rooms"])
+
+        # test that both lists have different directions
+        for i in range(0, number_rooms):
+            self.assertEqual(
+                channel_asc.json_body["rooms"][i]["room_id"],
+                channel_desc.json_body["rooms"][number_rooms - 1 - i]["room_id"],
+            )
+
+    def test_next_token(self) -> None:
+        """Testing that `next_token` appears at the right place"""
+
+        number_rooms = 5
+        self._create_destination_rooms(number_rooms)
+
+        #  `next_token` does not appear
+        # Number of results is the number of entries
+        channel = self.make_request(
+            "GET",
+            self.url + "?limit=5",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), number_rooms)
+        self.assertNotIn("next_token", channel.json_body)
+
+        #  `next_token` does not appear
+        # Number of max results is larger than the number of entries
+        channel = self.make_request(
+            "GET",
+            self.url + "?limit=6",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), number_rooms)
+        self.assertNotIn("next_token", channel.json_body)
+
+        #  `next_token` does appear
+        # Number of max results is smaller than the number of entries
+        channel = self.make_request(
+            "GET",
+            self.url + "?limit=4",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), 4)
+        self.assertEqual(channel.json_body["next_token"], "4")
+
+        # Check
+        # Set `from` to value of `next_token` for request remaining entries
+        #  `next_token` does not appear
+        channel = self.make_request(
+            "GET",
+            self.url + "?from=4",
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(len(channel.json_body["rooms"]), 1)
+        self.assertNotIn("next_token", channel.json_body)
+
+    def test_destination_rooms(self) -> None:
+        """Testing that request the list of rooms is successfully."""
+        number_rooms = 3
+        self._create_destination_rooms(number_rooms)
+
+        channel = self.make_request(
+            "GET",
+            self.url,
+            access_token=self.admin_user_tok,
+        )
+
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self.assertEqual(channel.json_body["total"], number_rooms)
+        self.assertEqual(number_rooms, len(channel.json_body["rooms"]))
+        self._check_fields(channel.json_body["rooms"])
+
+    def _create_destination_rooms(self, number_rooms: int) -> None:
+        """Create a number rooms for destination
+
+        Args:
+            number_rooms: Number of rooms to be created
+        """
+        for _ in range(0, number_rooms):
+            room_id = self.helper.create_room_as(
+                self.admin_user, tok=self.admin_user_tok
+            )
+            self.get_success(
+                self.store.store_destination_rooms_entries((self.dest,), room_id, 1234)
+            )
+
+    def _check_fields(self, content: List[JsonDict]) -> None:
+        """Checks that the expected room attributes are present in content
+
+        Args:
+            content: List that is checked for content
+        """
+        for c in content:
+            self.assertIn("room_id", c)
+            self.assertIn("stream_ordering", c)

tests/rest/admin/test_room.py

@@ -2468,7 +2468,6 @@ PURGE_TABLES = [
     "event_search",
     "events",
     "group_rooms",
-    "public_room_list_stream",
     "receipts_graph",
     "receipts_linearized",
     "room_aliases",

tests/rest/admin/test_username_available.py

@@ -14,9 +14,13 @@
 
 from http import HTTPStatus
 
+from twisted.test.proto_helpers import MemoryReactor
+
 import synapse.rest.admin
 from synapse.api.errors import Codes, SynapseError
 from synapse.rest.client import login
+from synapse.server import HomeServer
+from synapse.util import Clock
 
 from tests import unittest
 
@@ -28,11 +32,11 @@ class UsernameAvailableTestCase(unittest.HomeserverTestCase):
     ]
     url = "/_synapse/admin/v1/username_available"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.register_user("admin", "pass", admin=True)
         self.admin_user_tok = self.login("admin", "pass")
 
-        async def check_username(username):
+        async def check_username(username: str) -> bool:
             if username == "allowed":
                 return True
             raise SynapseError(
@@ -44,24 +48,24 @@ class UsernameAvailableTestCase(unittest.HomeserverTestCase):
         handler = self.hs.get_registration_handler()
         handler.check_username = check_username
 
-    def test_username_available(self):
+    def test_username_available(self) -> None:
         """
         The endpoint should return a HTTPStatus.OK response if the username does not exist
         """
 
         url = "%s?username=%s" % (self.url, "allowed")
-        channel = self.make_request("GET", url, None, self.admin_user_tok)
+        channel = self.make_request("GET", url, access_token=self.admin_user_tok)
 
         self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
         self.assertTrue(channel.json_body["available"])
 
-    def test_username_unavailable(self):
+    def test_username_unavailable(self) -> None:
         """
         The endpoint should return a HTTPStatus.OK response if the username does not exist
         """
 
         url = "%s?username=%s" % (self.url, "disallowed")
-        channel = self.make_request("GET", url, None, self.admin_user_tok)
+        channel = self.make_request("GET", url, access_token=self.admin_user_tok)
 
         self.assertEqual(
             HTTPStatus.BAD_REQUEST,

tests/rest/client/test_profile.py

@@ -13,8 +13,12 @@
 # limitations under the License.
 
 """Tests REST events for /profile paths."""
+from typing import Any, Dict
+
+from synapse.api.errors import Codes
 from synapse.rest import admin
 from synapse.rest.client import login, profile, room
+from synapse.types import UserID
 
 from tests import unittest
 
@@ -25,6 +29,7 @@ class ProfileTestCase(unittest.HomeserverTestCase):
         admin.register_servlets_for_client_rest_resource,
         login.register_servlets,
         profile.register_servlets,
+        room.register_servlets,
     ]
 
     def make_homeserver(self, reactor, clock):
@@ -150,6 +155,157 @@ class ProfileTestCase(unittest.HomeserverTestCase):
         self.assertEqual(channel.code, 200, channel.result)
         return channel.json_body.get("avatar_url")
 
+    @unittest.override_config({"max_avatar_size": 50})
+    def test_avatar_size_limit_global(self):
+        """Tests that the maximum size limit for avatars is enforced when updating a
+        global profile.
+        """
+        self._setup_local_files(
+            {
+                "small": {"size": 40},
+                "big": {"size": 60},
+            }
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/profile/{self.owner}/avatar_url",
+            content={"avatar_url": "mxc://test/big"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 403, channel.result)
+        self.assertEqual(
+            channel.json_body["errcode"], Codes.FORBIDDEN, channel.json_body
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/profile/{self.owner}/avatar_url",
+            content={"avatar_url": "mxc://test/small"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 200, channel.result)
+
+    @unittest.override_config({"max_avatar_size": 50})
+    def test_avatar_size_limit_per_room(self):
+        """Tests that the maximum size limit for avatars is enforced when updating a
+        per-room profile.
+        """
+        self._setup_local_files(
+            {
+                "small": {"size": 40},
+                "big": {"size": 60},
+            }
+        )
+
+        room_id = self.helper.create_room_as(tok=self.owner_tok)
+
+        channel = self.make_request(
+            "PUT",
+            f"/rooms/{room_id}/state/m.room.member/{self.owner}",
+            content={"membership": "join", "avatar_url": "mxc://test/big"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 403, channel.result)
+        self.assertEqual(
+            channel.json_body["errcode"], Codes.FORBIDDEN, channel.json_body
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/rooms/{room_id}/state/m.room.member/{self.owner}",
+            content={"membership": "join", "avatar_url": "mxc://test/small"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 200, channel.result)
+
+    @unittest.override_config({"allowed_avatar_mimetypes": ["image/png"]})
+    def test_avatar_allowed_mime_type_global(self):
+        """Tests that the MIME type whitelist for avatars is enforced when updating a
+        global profile.
+        """
+        self._setup_local_files(
+            {
+                "good": {"mimetype": "image/png"},
+                "bad": {"mimetype": "application/octet-stream"},
+            }
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/profile/{self.owner}/avatar_url",
+            content={"avatar_url": "mxc://test/bad"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 403, channel.result)
+        self.assertEqual(
+            channel.json_body["errcode"], Codes.FORBIDDEN, channel.json_body
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/profile/{self.owner}/avatar_url",
+            content={"avatar_url": "mxc://test/good"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 200, channel.result)
+
+    @unittest.override_config({"allowed_avatar_mimetypes": ["image/png"]})
+    def test_avatar_allowed_mime_type_per_room(self):
+        """Tests that the MIME type whitelist for avatars is enforced when updating a
+        per-room profile.
+        """
+        self._setup_local_files(
+            {
+                "good": {"mimetype": "image/png"},
+                "bad": {"mimetype": "application/octet-stream"},
+            }
+        )
+
+        room_id = self.helper.create_room_as(tok=self.owner_tok)
+
+        channel = self.make_request(
+            "PUT",
+            f"/rooms/{room_id}/state/m.room.member/{self.owner}",
+            content={"membership": "join", "avatar_url": "mxc://test/bad"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 403, channel.result)
+        self.assertEqual(
+            channel.json_body["errcode"], Codes.FORBIDDEN, channel.json_body
+        )
+
+        channel = self.make_request(
+            "PUT",
+            f"/rooms/{room_id}/state/m.room.member/{self.owner}",
+            content={"membership": "join", "avatar_url": "mxc://test/good"},
+            access_token=self.owner_tok,
+        )
+        self.assertEqual(channel.code, 200, channel.result)
+
+    def _setup_local_files(self, names_and_props: Dict[str, Dict[str, Any]]):
+        """Stores metadata about files in the database.
+
+        Args:
+            names_and_props: A dictionary with one entry per file, with the key being the
+                file's name, and the value being a dictionary of properties. Supported
+                properties are "mimetype" (for the file's type) and "size" (for the
+                file's size).
+        """
+        store = self.hs.get_datastore()
+
+        for name, props in names_and_props.items():
+            self.get_success(
+                store.store_local_media(
+                    media_id=name,
+                    media_type=props.get("mimetype", "image/png"),
+                    time_now_ms=self.clock.time_msec(),
+                    upload_name=None,
+                    media_length=props.get("size", 50),
+                    user_id=UserID.from_string("@rin:test"),
+                )
+            )
+
 
 class ProfilesRestrictedTestCase(unittest.HomeserverTestCase):
 

tests/rest/client/test_register.py

@@ -726,6 +726,47 @@ class RegisterRestServletTestCase(unittest.HomeserverTestCase):
             {"errcode": "M_UNKNOWN", "error": "Unable to parse email address"},
         )
 
+    @override_config(
+        {
+            "inhibit_user_in_use_error": True,
+        }
+    )
+    def test_inhibit_user_in_use_error(self):
+        """Tests that the 'inhibit_user_in_use_error' configuration flag behaves
+        correctly.
+        """
+        username = "arthur"
+
+        # Manually register the user, so we know the test isn't passing because of a lack
+        # of clashing.
+        reg_handler = self.hs.get_registration_handler()
+        self.get_success(reg_handler.register_user(username))
+
+        # Check that /available correctly ignores the username provided despite the
+        # username being already registered.
+        channel = self.make_request("GET", "register/available?username=" + username)
+        self.assertEquals(200, channel.code, channel.result)
+
+        # Test that when starting a UIA registration flow the request doesn't fail because
+        # of a conflicting username
+        channel = self.make_request(
+            "POST",
+            "register",
+            {"username": username, "type": "m.login.password", "password": "foo"},
+        )
+        self.assertEqual(channel.code, 401)
+        self.assertIn("session", channel.json_body)
+
+        # Test that finishing the registration fails because of a conflicting username.
+        session = channel.json_body["session"]
+        channel = self.make_request(
+            "POST",
+            "register",
+            {"auth": {"session": session, "type": LoginType.DUMMY}},
+        )
+        self.assertEqual(channel.code, 400, channel.json_body)
+        self.assertEqual(channel.json_body["errcode"], Codes.USER_IN_USE)
+
 
 class AccountValidityTestCase(unittest.HomeserverTestCase):
 

tests/rest/client/test_relations.py

@@ -577,7 +577,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         self.assertEquals(200, channel.code, channel.json_body)
         room_timeline = channel.json_body["rooms"]["join"][self.room]["timeline"]
         self.assertTrue(room_timeline["limited"])
-        self._find_event_in_chunk(room_timeline["events"])
+        assert_bundle(self._find_event_in_chunk(room_timeline["events"]))
 
     def test_aggregation_get_event_for_annotation(self):
         """Test that annotations do not get bundled aggregations included

tests/rest/media/v1/test_html_preview.py

@@ -16,10 +16,11 @@ from synapse.rest.media.v1.preview_html import (
     _get_html_media_encodings,
     decode_body,
     parse_html_to_open_graph,
+    rebase_url,
     summarize_paragraphs,
 )
 
-from . import unittest
+from tests import unittest
 
 try:
     import lxml
@@ -447,3 +448,34 @@ class MediaEncodingTestCase(unittest.TestCase):
             'text/html; charset="invalid"',
         )
         self.assertEqual(list(encodings), ["utf-8", "cp1252"])
+
+
+class RebaseUrlTestCase(unittest.TestCase):
+    def test_relative(self):
+        """Relative URLs should be resolved based on the context of the base URL."""
+        self.assertEqual(
+            rebase_url("subpage", "https://example.com/foo/"),
+            "https://example.com/foo/subpage",
+        )
+        self.assertEqual(
+            rebase_url("sibling", "https://example.com/foo"),
+            "https://example.com/sibling",
+        )
+        self.assertEqual(
+            rebase_url("/bar", "https://example.com/foo/"),
+            "https://example.com/bar",
+        )
+
+    def test_absolute(self):
+        """Absolute URLs should not be modified."""
+        self.assertEqual(
+            rebase_url("https://alice.com/a/", "https://example.com/foo/"),
+            "https://alice.com/a/",
+        )
+
+    def test_data(self):
+        """Data URLs should not be modified."""
+        self.assertEqual(
+            rebase_url("data:,Hello%2C%20World%21", "https://example.com/foo/"),
+            "data:,Hello%2C%20World%21",
+        )

tests/rest/media/v1/test_url_preview.py

@@ -12,9 +12,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import base64
 import json
 import os
 import re
+from urllib.parse import urlencode
 
 from twisted.internet._resolver import HostResolution
 from twisted.internet.address import IPv4Address, IPv6Address
@@ -23,6 +25,7 @@ from twisted.test.proto_helpers import AccumulatingProtocol
 
 from synapse.config.oembed import OEmbedEndpointConfig
 from synapse.rest.media.v1.preview_url_resource import IMAGE_CACHE_EXPIRY_MS
+from synapse.types import JsonDict
 from synapse.util.stringutils import parse_and_validate_mxc_uri
 
 from tests import unittest
@@ -142,6 +145,14 @@ class URLPreviewTests(unittest.HomeserverTestCase):
     def create_test_resource(self):
         return self.hs.get_media_repository_resource()
 
+    def _assert_small_png(self, json_body: JsonDict) -> None:
+        """Assert properties from the SMALL_PNG test image."""
+        self.assertTrue(json_body["og:image"].startswith("mxc://"))
+        self.assertEqual(json_body["og:image:height"], 1)
+        self.assertEqual(json_body["og:image:width"], 1)
+        self.assertEqual(json_body["og:image:type"], "image/png")
+        self.assertEqual(json_body["matrix:image:size"], 67)
+
     def test_cache_returns_correct_type(self):
         self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
 
@@ -569,6 +580,66 @@ class URLPreviewTests(unittest.HomeserverTestCase):
             server.data,
         )
 
+    def test_data_url(self):
+        """
+        Requesting to preview a data URL is not supported.
+        """
+        self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
+
+        data = base64.b64encode(SMALL_PNG).decode()
+
+        query_params = urlencode(
+            {
+                "url": f'<html><head><img src="data:image/png;base64,{data}" /></head></html>'
+            }
+        )
+
+        channel = self.make_request(
+            "GET",
+            f"preview_url?{query_params}",
+            shorthand=False,
+        )
+        self.pump()
+
+        self.assertEqual(channel.code, 500)
+
+    def test_inline_data_url(self):
+        """
+        An inline image (as a data URL) should be parsed properly.
+        """
+        self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
+
+        data = base64.b64encode(SMALL_PNG)
+
+        end_content = (
+            b"<html><head>" b'<img src="data:image/png;base64,%s" />' b"</head></html>"
+        ) % (data,)
+
+        channel = self.make_request(
+            "GET",
+            "preview_url?url=http://matrix.org",
+            shorthand=False,
+            await_result=False,
+        )
+        self.pump()
+
+        client = self.reactor.tcpClients[0][2].buildProtocol(None)
+        server = AccumulatingProtocol()
+        server.makeConnection(FakeTransport(client, self.reactor))
+        client.makeConnection(FakeTransport(server, self.reactor))
+        client.dataReceived(
+            (
+                b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
+                b'Content-Type: text/html; charset="utf8"\r\n\r\n'
+            )
+            % (len(end_content),)
+            + end_content
+        )
+
+        self.pump()
+        self.assertEqual(channel.code, 200)
+        self._assert_small_png(channel.json_body)
+
     def test_oembed_photo(self):
         """Test an oEmbed endpoint which returns a 'photo' type which redirects the preview to a new URL."""
         self.lookups["publish.twitter.com"] = [(IPv4Address, "10.1.2.3")]
@@ -626,10 +697,7 @@ class URLPreviewTests(unittest.HomeserverTestCase):
         self.assertEqual(channel.code, 200)
         body = channel.json_body
         self.assertEqual(body["og:url"], "http://twitter.com/matrixdotorg/status/12345")
-        self.assertTrue(body["og:image"].startswith("mxc://"))
+        self._assert_small_png(body)
-        self.assertEqual(body["og:image:height"], 1)
-        self.assertEqual(body["og:image:width"], 1)
-        self.assertEqual(body["og:image:type"], "image/png")
 
     def test_oembed_rich(self):
         """Test an oEmbed endpoint which returns HTML content via the 'rich' type."""
@@ -820,10 +888,7 @@ class URLPreviewTests(unittest.HomeserverTestCase):
         self.assertEqual(
             body["og:url"], "http://www.twitter.com/matrixdotorg/status/12345"
         )
-        self.assertTrue(body["og:image"].startswith("mxc://"))
+        self._assert_small_png(body)
-        self.assertEqual(body["og:image:height"], 1)
-        self.assertEqual(body["og:image:width"], 1)
-        self.assertEqual(body["og:image:type"], "image/png")
 
     def _download_image(self):
         """Downloads an image into the URL cache.

tests/server.py

@@ -313,7 +313,7 @@ def make_request(
     req = request(channel, site)
     req.content = BytesIO(content)
     # Twisted expects to be at the end of the content when parsing the request.
-    req.content.seek(SEEK_END)
+    req.content.seek(0, SEEK_END)
 
     if access_token:
         req.requestHeaders.addRawHeader(