check_homeservers_versions_in_room.sh

#!/bin/bash

# Init.
if [ "$1" == "--silent-fail" ]; then
	SILENT_FAIL=true
else
	SILENT_FAIL=false
fi

ACCESS_TOKEN="[REDACTED]"
HS_FQDN="chat.abolivier.bzh"
ROOM_ID="!someroom:example.com"

declare -A versions
success_count=0

# Get the initial list of servers in the room.
res=`curl --silent https://$HS_FQDN/_matrix/client/r0/rooms/$ROOM_ID/joined_members?access_token=$ACCESS_TOKEN`
srvs=`echo $res | jq ".joined | keys[]" | sed 's/"//g' | cut -d':' -f2 | sort -u`

function resolve_srv() {
  fed=`dig +short -t SRV _matrix._tcp.$1 | grep -oE "[^ ]+ [^ ]+$" | sed 's/\.$//'`
	dom=`echo $fed | cut -d' ' -f2`
	port=`echo $fed | cut -d' ' -f1`

	echo "$dom:$port"
}

function resolve_well_known() {
	code=`curl --connect-timeout 10 -L --silent --write-out %{http_code} https://$1/.well-known/matrix/server | tail -n1`
	if [ "$code" != "200" ]; then echo ""; return; fi
	echo `curl --connect-timeout 10 -L --silent https://$1/.well-known/matrix/server | jq '."m.server"' | sed -E 's/["]//g' | sed -E "s/[']//g"`
}

# Check and display version for each server.
for s in $srvs; do
	# Try to resolve the host of the server using a well-known file
	srv=0
	fed=`resolve_well_known $s`
	# If that failed, try to resolve using a SRV record
	if [ -z "$fed" ]; then
		srv=1
		fed=`resolve_srv $s`
	fi
	if [ -z `echo $fed | grep ":"` ]; then
		dom=$fed
		port="8448"
	else
		dom=`echo $fed | cut -d':' -f1`
		port=`echo $fed | cut -d':' -f2`
	fi
	# Get server version.
	if [ "$srv" == "1" ]; then
	  ver=`curl --connect-to "$s:443:$dom:$port" --connect-timeout 10 --silent https://$s/_matrix/federation/v1/version | jq -r '.server | .version' 2> /dev/null`
	else
	  ver=`curl --connect-timeout 10 --silent https://$dom:$port/_matrix/federation/v1/version | jq -r '.server | .version' 2> /dev/null`
	fi
	# If the request was successful, print the result and increment the counters. Otherwise print that it couldn't be reached (if not in silent failure mode).
	if [ ! -z "$ver" ]; then
		echo "$s: $ver"
		shortver=`echo $ver | cut -d" " -f1`
		# Update the counters.
		count=${versions[$shortver]}
		versions["$shortver"]=$(($count+1))
		success_count=$(($success_count+1))
	else
		if [ $SILENT_FAIL == false ]; then
			echo "Can't get version of homeserver $s"
		fi
	fi
done

# Display stats on the version of online servers in the room.
echo -e "\n\n----- STATS -----\n"
echo "Online servers in the room: $success_count"

# Iterate over the per-version counters.
vers=`echo "${!versions[@]}" | sed 's/ /\n/g' | sort -r`
for ver in $vers; do
	echo "$ver: ${versions[$ver]}"
done