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Added a first cut for a 'how to' on the client-server API.
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Kegan Dougal
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docs/client-server/howto.rst
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docs/client-server/howto.rst
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How to use the client-server API
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================================
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If you haven't already, get a home server up and running on localhost:8080.
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Accounts
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========
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Before you can send and receive messages, you must register for an account. If
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you already have an account, you must login into it.
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Registration
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------------
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The aim of registration is to get a user ID and access token which you will need
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when accessing other APIs.
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curl -XPOST -d '{"user_id":"example", "password":"wordpass"}' "http://localhost:8080/matrix/client/api/v1/register"
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{
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"access_token": "QGV4YW1wbGU6bG9jYWxob3N0.AqdSzFmFYrLrTmteXc",
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"home_server": "localhost",
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"user_id": "@example:localhost"
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}
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NB: If a user ID is not specified, one will be randomly generated for you. If
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you do not specify a password, you will be unable to login to the account if you
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forget the access token.
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Login
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-----
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The aim of login is to get an access token for your existing user ID.
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curl -XGET "http://localhost:8080/matrix/client/api/v1/login"
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{
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"type": "m.login.password"
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}
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curl -XPOST -d '{"type":"m.login.password", "user":"example", "password":"wordpass"}' "http://localhost:8080/matrix/client/api/v1/login"
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{
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"access_token": "QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd",
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"home_server": "localhost",
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"user_id": "@example:localhost"
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}
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NB: Different home servers may implement different methods for logging in to an
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existing account. In order to check that you know how to login to this home
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server, you must perform a GET first and make sure you recognise the type. If
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you do not know how to login, you can GET /login/fallback which will return a
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basic webpage which you can use to login.
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Making rooms and sending messages
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=================================
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Creating a room
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---------------
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If you want to send a message to someone, you have to be in a room with them. To
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create a room:
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curl -XPOST -d '{"room_alias_name":"tutorial"}' "http://localhost:8080/matrix/client/api/v1/rooms?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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{
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"room_alias": "#tutorial:localhost",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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The "room alias" is a human-readable string which can be shared with other users
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so they can join a room, rather than the room ID which is a randomly generated
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string. You can have multiple room aliases per room.
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TODO(kegan): How to add/remove aliases from an existing room.
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Sending messages
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----------------
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You can now send messages to this room:
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curl -XPUT -d '{"msgtype":"m.text", "body":"hello"}' "http://localhost:8080/matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/messages/%40example%3Alocalhost/msgid1?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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NB: There are no limitations to the types of messages which can be exchanged.
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The only requirement is that 'msgtype' is specified.
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Inviting and joining rooms
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==========================
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Inviting a user to a room
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-------------------------
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You can directly invite a user to a room like so:
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curl -XPUT -d '{"membership":"invite"}' "http://localhost:8080/matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/members/%40myfriend%3Alocalhost/state?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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This informs @myfriend:localhost of the room ID !CvcvRuDYDzTOzfKKgh:localhost
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and allows them to join the room.
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Joining a room via an invite
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----------------------------
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If you receive an invite, you can join the room by changing the membership to
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join:
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curl -XPUT -d '{"membership":"join"}' "http://localhost:8080/matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/members/%40myfriend%3Alocalhost/state?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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NB: Only the person invited (@myfriend:localhost) can change the membership
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state to 'join'.
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Joining a room via an alias
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---------------------------
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Alternatively, if you know the room alias for this room and the room config
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allows it, you can directly join a room via the alias:
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curl -XPUT -d '{}' "http://localhost:8080/matrix/client/api/v1/join/%23tutorial%3Alocalhost?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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{
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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You will need to use the room ID when sending messages, not the room alias.
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Getting events
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==============
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An event is some interesting piece of data that a client may be interested in.
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It can be a message in a room, a room invite, etc. There are many different ways
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of getting events, depending on what state the client is in.
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Getting all state
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-----------------
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If the client doesn't know any information on the rooms the user is
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invited/joined on, you can get all your state for all your rooms like so:
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curl -XGET "http://localhost:8080/matrix/client/api/v1/im/sync?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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[
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{
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"membership": "join",
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"messages": {
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"chunk": [
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{
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"content": {
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"body": "@example:localhost joined the room.",
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"hsob_ts": 1408444664249,
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"membership": "join",
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"membership_source": "@example:localhost",
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"membership_target": "@example:localhost",
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"msgtype": "m.text"
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},
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"event_id": "lZjmmlrEvo",
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"msg_id": "m1408444664249",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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},
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{
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"content": {
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"body": "hello",
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"hsob_ts": 1408445405672,
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"msgtype": "m.text"
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},
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"event_id": "BiBJqamISg",
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"msg_id": "msgid1",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "@example:localhost"
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},
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[...]
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{
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"content": {
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"body": "@myfriend:localhost joined the room.",
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"hsob_ts": 1408446501661,
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"membership": "join",
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"membership_source": "@myfriend:localhost",
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"membership_target": "@myfriend:localhost",
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"msgtype": "m.text"
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},
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"event_id": "IMmXbOzFAa",
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"msg_id": "m1408446501661",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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}
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],
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"end": "20",
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"start": "0"
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},
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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]
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This returns all the room IDs of rooms you are invited/joined on, as well as all
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of the messages and feedback for these rooms. This can be a LOT of data. You may
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just want the most recent message for each room. This can be done by applying
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pagination stream parameters to this request:
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curl -XGET "http://localhost:8080/matrix/client/api/v1/im/sync?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK&from=END&to=START&limit=1"
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[
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{
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"membership": "join",
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"messages": {
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"chunk": [
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{
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"content": {
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"body": "@myfriend:localhost joined the room.",
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"hsob_ts": 1408446501661,
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"membership": "join",
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"membership_source": "@myfriend:localhost",
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"membership_target": "@myfriend:localhost",
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"msgtype": "m.text"
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},
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"event_id": "IMmXbOzFAa",
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"msg_id": "m1408446501661",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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}
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],
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"end": "20",
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"start": "21"
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},
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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]
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Getting live state
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------------------
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Once you know which rooms the client has previously interacted with, you need to
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listen for incoming events. This can be done like so:
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curl -XGET "http://localhost:8080/matrix/client/api/v1/events?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK&from=END"
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{
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"chunk": [],
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"end": "215",
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"start": "215"
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}
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This will block waiting for an incoming event, timing out after several seconds.
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A client should repeatedly make requests with the "from" query parameter with
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the value of "end" (in this case "215").
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NB: The timeout can be changed by adding a "timeout" query parameter, which is
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in milliseconds. A timeout of 0 will not block.
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