Add server icons from rooms

output/index.css

@@ -349,6 +349,7 @@ a[href^="https:"] .protocol-indicator::after {
 	color: white;
 	text-shadow: 0 0 0.25em #000a;
 	box-shadow: 0 0 0.05em #777;
+	background-size: cover;
 }
 
 .td_server_icon-circle span {

php/servers/known-servers.php

@@ -72,4 +72,9 @@
 	$ICON_BLOCKLIST = [
 		"gaohuangse.work"
 	];
+
+	$SERVER_ICON_MAPPING = [
+		"open.getsession.org" => "session",
+		"sog.caliban.org" => "privacy"
+	]
 ?>

php/utils/server-icons.php

@@ -0,0 +1,25 @@
+<?php
+    require_once "$PROJECT_ROOT/php/servers/known-servers.php";
+    require_once "$PROJECT_ROOT/php/utils/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 = $server->get_hostname();
+        if (!isset($SERVER_ICON_MAPPING[$hostname])) {
+            return "";
+        }
+        $room_token = $SERVER_ICON_MAPPING[$hostname];
+        $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);
+    }
+?>

php/utils/servers-rooms.php

@@ -776,6 +776,22 @@
 			return $this->pubkey != "";
 		}
 
+		/**
+		 * Returns the room of the given token, or null if one does not exist.
+		 */
+		function get_room_by_token(string $token): \CommunityRoom | null {
+			$candidates = array_filter($this->rooms, function(\CommunityRoom $room) use ($token) {
+				return $room->token == $token;
+			});
+			
+			/** Filter doesn't reindex */
+			foreach ($candidates as $candidate) {
+				return $candidate;
+			}
+
+			return null;
+		}
+
 		/**
 		 * Attempts to fetch the current server's room listing.
 		 * Downgrades the server's scheme to HTTP if necessary.

sites/+components/tbl_communities.php

@@ -3,6 +3,7 @@
 	require_once "$PROJECT_ROOT/php/utils/servers-rooms.php";
 	require_once "$PROJECT_ROOT/php/utils/room-invites.php";
 	require_once "$PROJECT_ROOT/php/utils/room-icons.php";
+	require_once "$PROJECT_ROOT/php/utils/server-icons.php";
 
 	/**
 	 * @var CommunityRoom[] $rooms
@@ -52,6 +53,7 @@
 		$pubkey = $room->server->get_pubkey();
 		$icon_hue = hexdec($pubkey[2] . $pubkey[2]);
 		$icon_color = "hsl($icon_hue, 80%, 50%)";
+		$server_icon = server_icon($room->server, '64x64');
 
 		$hostname = $room->server->get_base_url();
 
@@ -145,9 +147,13 @@
 			title="Host: <?=$hostname?> (<?=$pubkey?>)"
 			item="image"
 		>
+<?php if (empty($server_icon)): ?>
 			<div class="td_server_icon-circle" style="background-color: <?=$icon_color?>">
 				<span><?=strtoupper($pubkey[0] . $pubkey[1])?></span>
 			</div>
+<?php else: ?>
+			<div class="td_server_icon-circle" style="background-image: url('<?=$server_icon?>')"></div>
+<?php endif; ?>
 		</td>
 		<td class="td_join_url">
 			<div class="join_url_container" data-url="<?=$join_link?>">