#!/bin/sh
# usage: define the variables below and add a cron job to run it every hour

roomid=''
mods_roomid=''  # for notifications
bot_user_token='syt_...'
morg_user_token='mct_...'
user_ids_to_tag='["@user:domain.tld","@other_user.domain.tld"]'

curl -s \
  -X GET "https://xmr.mx/_matrix/client/r0/rooms/$roomid/members" \
  -H "Authorization: Bearer $bot_user_token" \
  > /tmp/members.xmrmx.json

curl -s \
  -X GET "https://matrix.org/_matrix/client/r0/rooms/$roomid/members" \
  -H "Authorization: Bearer $morg_user_token" \
  > /tmp/members.matrixorg.json

jq '.chunk.[] | {membership: .content.membership, user_id: .state_key}' /tmp/members.matrixorg.json  \
  | grep -A 1 'membership": "join' \
  | grep user_id \
  | perl -lpe 's/  "user_id": "([^"]+)"/$1/' \
  | sort -u  > /tmp/members.matrixorg.csv

jq '.chunk.[] | {membership: .content.membership, user_id: .state_key}' /tmp/members.xmrmx.json \
  | grep -A 1 'membership": "join' \
  | grep user_id \
  | perl -lpe 's/  "user_id": "([^"]+)"/$1/' \
  | sort -u > /tmp/members.xmrmx.csv

diff /tmp/members.xmrmx.csv /tmp/members.matrixorg.csv | grep '@' > /tmp/discrepancies.txt
is_positive=$?

header="Membership discrepancies between xmr.mx and matrix.org detected:"
body="$header\n$(cat /tmp/discrepancies.txt | sed 's/$/\\n/' | tr -d '\n')"
formatted_body="<strong>$header</strong><pre>$(cat /tmp/discrepancies.txt | sed 's/$/\<br\>/' | tr -d '\n')</pre>"
json_data=$(cat <<EOF
  {
    "msgtype": "m.text",
    "format":"org.matrix.custom.html",
    "body": "$body",
    "formatted_body": "$formatted_body",
    "m.mentions": {
      "user_ids": $user_ids_to_tag
    }
  }
EOF
)

if [ $is_positive -eq 0 ]; then
  echo Discrepancies found.
  txnId=$(date +%s%N | cut -b1-13)$(shuf -i 1000-9999 -n 1)
  curl -s -X PUT \
    "https://xmr.mx/_matrix/client/v3/rooms/$mods_roomid/send/m.room.message/m$txnId.00" \
    -H "Authorization: Bearer $bot_user_token" \
    -H "Content-Type: application/json" \
    -d "$json_data" \
    -o /dev/null \
    -w "%{http_code}"
  echo ""
else
  echo No discrepancies found.
fi