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SC2089: Quotes/backslashes will be treated literally. Use an array. https://github.com/koalaman/shellcheck/wiki/SC2089 SC2090: Quotes/backslashes in this variable will not be respected. https://github.com/koalaman/shellcheck/wiki/SC2090 Putting literal JSON in a variable mistakenly triggers these warnings. Instead of adding ignore directives, this can be avoided by inlining the JSON data into the curl invocation. Since the variable is only used in this one location, inlining is fine. Signed-off-by: Dan Callahan <danc@element.io>
143 lines
6.5 KiB
Bash
143 lines
6.5 KiB
Bash
#!/usr/bin/env bash
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# this script will use the api:
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# https://matrix-org.github.io/synapse/latest/admin_api/purge_history_api.html
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#
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# It will purge all messages in a list of rooms up to a cetrain event
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###################################################################################################
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# define your domain and admin user
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###################################################################################################
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# add this user as admin in your home server:
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DOMAIN=yourserver.tld
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# add this user as admin in your home server:
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ADMIN="@you_admin_username:$DOMAIN"
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API_URL="$DOMAIN:8008/_matrix/client/r0"
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###################################################################################################
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#choose the rooms to prune old messages from (add a free comment at the end)
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###################################################################################################
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# the room_id's you can get e.g. from your Riot clients "View Source" button on each message
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ROOMS_ARRAY=(
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'!DgvjtOljKujDBrxyHk:matrix.org#riot:matrix.org'
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'!QtykxKocfZaZOUrTwp:matrix.org#Matrix HQ'
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)
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# ALTERNATIVELY:
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# you can select all the rooms that are not encrypted and loop over the result:
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# SELECT room_id FROM rooms WHERE room_id NOT IN (SELECT DISTINCT room_id FROM events WHERE type ='m.room.encrypted')
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# or
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# select all rooms with at least 100 members:
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# SELECT q.room_id FROM (select count(*) as numberofusers, room_id FROM current_state_events WHERE type ='m.room.member'
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# GROUP BY room_id) AS q LEFT JOIN room_aliases a ON q.room_id=a.room_id WHERE q.numberofusers > 100 ORDER BY numberofusers desc
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###################################################################################################
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# evaluate the EVENT_ID before which should be pruned
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###################################################################################################
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# choose a time before which the messages should be pruned:
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TIME='12 months ago'
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# ALTERNATIVELY:
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# a certain time:
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# TIME='2016-08-31 23:59:59'
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# creates a timestamp from the given time string:
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UNIX_TIMESTAMP=$(date +%s%3N --date='TZ="UTC+2" '"$TIME")
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# ALTERNATIVELY:
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# prune all messages that are older than 1000 messages ago:
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# LAST_MESSAGES=1000
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# SQL_GET_EVENT="SELECT event_id from events WHERE type='m.room.message' AND room_id ='$ROOM' ORDER BY received_ts DESC LIMIT 1 offset $(($LAST_MESSAGES - 1))"
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# ALTERNATIVELY:
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# select the EVENT_ID manually:
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#EVENT_ID='$1471814088343495zpPNI:matrix.org' # an example event from 21st of Aug 2016 by Matthew
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###################################################################################################
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# make the admin user a server admin in the database with
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###################################################################################################
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# psql -A -t --dbname=synapse -c "UPDATE users SET admin=1 WHERE name LIKE '$ADMIN'"
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###################################################################################################
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# database function
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###################################################################################################
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sql (){
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# for sqlite3:
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#sqlite3 homeserver.db "pragma busy_timeout=20000;$1" | awk '{print $2}'
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# for postgres:
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psql -A -t --dbname=synapse -c "$1" | grep -v 'Pager'
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}
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###################################################################################################
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# get an access token
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###################################################################################################
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# for example externally by watching Riot in your browser's network inspector
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# or internally on the server locally, use this:
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TOKEN=$(sql "SELECT token FROM access_tokens WHERE user_id='$ADMIN' ORDER BY id DESC LIMIT 1")
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AUTH="Authorization: Bearer $TOKEN"
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###################################################################################################
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# check, if your TOKEN works. For example this works:
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###################################################################################################
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# $ curl --header "$AUTH" "$API_URL/rooms/$ROOM/state/m.room.power_levels"
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###################################################################################################
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# finally start pruning the room:
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###################################################################################################
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# this will really delete local events, so the messages in the room really
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# disappear unless they are restored by remote federation. This is because
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# we pass {"delete_local_events":true} to the curl invocation below.
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for ROOM in "${ROOMS_ARRAY[@]}"; do
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echo "########################################### $(date) ################# "
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echo "pruning room: $ROOM ..."
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ROOM=${ROOM%#*}
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#set -x
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echo "check for alias in db..."
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# for postgres:
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sql "SELECT * FROM room_aliases WHERE room_id='$ROOM'"
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echo "get event..."
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# for postgres:
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EVENT_ID=$(sql "SELECT event_id FROM events WHERE type='m.room.message' AND received_ts<'$UNIX_TIMESTAMP' AND room_id='$ROOM' ORDER BY received_ts DESC LIMIT 1;")
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if [ "$EVENT_ID" == "" ]; then
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echo "no event $TIME"
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else
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echo "event: $EVENT_ID"
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SLEEP=2
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set -x
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# call purge
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OUT=$(curl --header "$AUTH" -s -d '{"delete_local_events":true}' POST "$API_URL/admin/purge_history/$ROOM/$EVENT_ID")
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PURGE_ID=$(echo "$OUT" |grep purge_id|cut -d'"' -f4 )
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if [ "$PURGE_ID" == "" ]; then
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# probably the history purge is already in progress for $ROOM
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: "continuing with next room"
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else
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while : ; do
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# get status of purge and sleep longer each time if still active
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sleep $SLEEP
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STATUS=$(curl --header "$AUTH" -s GET "$API_URL/admin/purge_history_status/$PURGE_ID" |grep status|cut -d'"' -f4)
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: "$ROOM --> Status: $STATUS"
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[[ "$STATUS" == "active" ]] || break
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SLEEP=$((SLEEP + 1))
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done
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fi
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set +x
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sleep 1
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fi
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done
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###################################################################################################
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# additionally
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###################################################################################################
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# to benefit from pruning large amounts of data, you need to call VACUUM to free the unused space.
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# This can take a very long time (hours) and the client have to be stopped while you do so:
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# $ synctl stop
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# $ sqlite3 -line homeserver.db "vacuum;"
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# $ synctl start
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# This could be set, so you don't need to prune every time after deleting some rows:
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# $ sqlite3 homeserver.db "PRAGMA auto_vacuum = FULL;"
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# be cautious, it could make the database somewhat slow if there are a lot of deletions
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exit
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