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#!/bin/bash
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# this script will use the api:
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# https://github.com/matrix-org/synapse/blob/master/docs/admin_api/purge_history_api.rst
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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/$ROOM/state/m.room.power_levels"
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###################################################################################################
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# finally start pruning the room:
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###################################################################################################
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POSTDATA='{"delete_local_events":"true"}' # this will really delete local events, so the messages in the room really disappear unless they are restored by remote federation
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for ROOM in "${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 $POSTDATA POST "$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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Richard van der Hoff