sessioncommunities.online/php/assets/server-icons.php

<?php
	/**
	 * \file
	 * Implement the fetching of Community server icons.
	 */

	require_once 'servers/known-servers.php';
	require_once 'assets/room-icons.php';

	/**
	 * Fetch the icon of the given Community server and return its relative path.
	 * @param CommunityServer $server
	 * @param string $size Image dimensions.
	 * @return string Relative path or null if icon is absent.
	 */
	function server_icon(CommunityServer $server, string $size): ?string {
		global $SERVER_ICON_MAPPING;
		$hostname = $server->get_hostname();
		$pubkey = $server->get_pubkey();
		if (isset($SERVER_ICON_MAPPING[$hostname])) {
			$room_token = $SERVER_ICON_MAPPING[$hostname];
		} else if (isset($SERVER_ICON_MAPPING[$pubkey])) {
			$room_token = $SERVER_ICON_MAPPING[$pubkey];
		} else {
			return "";
		}
		$room = $server->get_room_by_token($room_token);
		if (!$room) {
			log_warning("Room $room_token on $hostname does not exist, cannot be used as icon.");
			return "";
		}
		return room_icon($room, $size);
	}
?>