Prototype resizable server icons

.phpenv

@@ -7,6 +7,9 @@
 	$LANGUAGES_ROOT="$PROJECT_ROOT/languages";
 	$QR_CODES="$DOCUMENT_ROOT/qr-codes";
 	$QR_CODES_RELATIVE="qr-codes";
+	$ROOM_ICONS_CACHE="$CACHE_ROOT/icons";
+	$ROOM_ICONS="$DOCUMENT_ROOT/icons";
+	$ROOM_ICONS_RELATIVE="icons";
 
 	include_once "$PROJECT_ROOT/php/utils/logging.php";
 

php/fetch-servers.php

@@ -24,7 +24,7 @@
 	function main() {
 		global $CACHE_ROOT, $ROOMS_FILE, $KNOWN_SERVERS, $KNOWN_PUBKEYS;
 
-		// Create default directories with conservative permissions.
+		// Create default directories..
 		file_exists($CACHE_ROOT) or mkdir($CACHE_ROOT, 0700);
 
 		// Query our sources and store the resulting HTML.

php/servers/known-servers.php

@@ -54,4 +54,9 @@
 		"session.hwreload.it"         => "4b3e75eedd2116b4dab0bcb6443b0e9fbfce7bcf1d35970bdad8a57a0113fb20",
 		"sogs.k9net.org"              => "fdcb047eb78520e925fda512a45ae74c6e2de9e0df206b3c0471bf1509919559",
 	);
+
+	/** These hostnames are considered to have safe room icons. */
+	$ICON_ALLOWLIST = [
+		"open.getsession.org"
+	];
 ?>

php/utils/room-icons.php

@@ -0,0 +1,84 @@
+<?php
+    require_once "$PROJECT_ROOT/php/servers/known-servers.php";
+
+    /**
+     * Return local path to room icon.
+     * @param string $room_id Id of room to locate icon for.
+     */
+    function room_icon_path(string $room_id): string {
+        global $ROOM_ICONS_CACHE;
+        return "$ROOM_ICONS_CACHE/$room_id";
+    }
+
+    /**
+     * Return local path to resized room icon.
+     * @param string $room_id Id of room to locate icon for.
+     * @param string $size Image dimensions.
+     */
+    function room_icon_path_resized(string $room_id, string $size): string {
+        global $ROOM_ICONS_CACHE;
+        return "$ROOM_ICONS_CACHE/$room_id-$size";
+    }
+
+    /**
+     * Return server path to room icon.
+     * @param string $room_id Id of room to locate icon for.
+     * @param string $size Image dimensions.
+     */
+    function room_icon_path_relative(string $room_id, string $size): string {
+        global $ROOM_ICONS_RELATIVE;
+        return "$ROOM_ICONS_RELATIVE/$room_id-$size";
+    }
+
+    /**
+     * Fetch the icon of the given room and return its relative path.
+     * @param \CommunityRoom $room
+     * @param string $size Image dimensions.
+     * @return string Relative path or null if icon is absent.
+     */
+    function room_icon(\CommunityRoom $room, string $size): ?string {
+        global $ICON_ALLOWLIST;
+        list($width, $height) = explode("x", $size);
+        $width = intval($width);
+        $height = intval($height);
+        assert(!empty($width) && !empty($height));
+        if (!in_array($room->server->get_hostname(), $ICON_ALLOWLIST)) {
+            return null;
+        }
+        if ($room->has_nsfw_keywords()) {
+            return null;
+        }
+        $room_id = $room->get_room_identifier();
+        $icon_cached = room_icon_path($room_id);
+        $icon_resized = room_icon_path_resized($room_id, $size);
+        if (file_exists($icon_resized)) {
+            return room_icon_path_relative($room_id, $size);
+        }
+        if (!file_exists($icon_cached)) {
+            $icon_url = $room->get_icon_url();
+            if (empty($icon_url)) {
+                return null;
+            }
+            log_debug("Fetching icon for $room_id.");
+            $icon = file_get_contents($icon_url);
+            if (empty($icon)) {
+                log_info("$room_id returned empty icon.");
+            }
+            // Cache result, no matter if empty
+            file_put_contents($icon_cached, $icon);
+        }
+        $icon_cached_contents = file_get_contents($icon_cached);
+        if (empty($icon_cached_contents)) {
+            file_put_contents($icon_resized, "");
+            return "";
+        }
+        // Resize image
+        $gd_image = imagecreatefromstring($icon_cached_contents);
+        $gd_resized = imagescale($gd_image, $width, $height);
+        imagewebp($gd_resized, to: $icon_resized);
+        return room_icon_path_relative($room_id, $size);
+    }
+
+    file_exists($ROOM_ICONS_CACHE) or mkdir($ROOM_ICONS_CACHE, 0755, true);
+    file_exists($ROOM_ICONS) or mkdir($ROOM_ICONS, 0755, true);
+?>

php/utils/room-invites.php

@@ -9,7 +9,7 @@
 	}
 
     /**
-     * Return remote path to room invite code.
+     * Return server-relative path to room invite code.
 	 * @param string $room_id Id of room to locate QR code for.
 	 */
 	function room_qr_code_path_relative(string $room_id): string {
@@ -19,7 +19,7 @@
 
     
 	/**
-	 * Fetch QR invite of the given room and return its local path.
+	 * Fetch QR invite of the given room and return its relative path.
 	 * @param \CommunityRoom $room
      * @return string
 	 */
@@ -31,6 +31,9 @@
 		}
 		log_debug("Fetching QR code for $room_id.");
 		$png = file_get_contents($room->get_invite_url());
+		if (empty($png)) {
+			log_warning("$room_id returned empty QR code.");
+		}
 		file_put_contents($png_cached, $png);
 		return room_qr_code_path_relative($room_id);
 	}

php/utils/servers-rooms.php

@@ -273,7 +273,7 @@
 			$this->tags = [...$this->tags, ...$tags];
 		}
 
-		private function has_nsfw_keywords(): bool {
+		public function has_nsfw_keywords(): bool {
 			// Description not included due to false positives.
 			$blob = 
 				strtolower($this->name) . " " .

sites/+components/tbl_communities.php

@@ -2,6 +2,7 @@
 	require_once "$PROJECT_ROOT/php/utils/utils.php";
 	require_once "$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";
 
 	/**
 	 * @var CommunityRoom[] $rooms
@@ -75,6 +76,7 @@
 		data-hostname="<?=$hostname?>"
 		data-staff='<?=$staff_json?>'
 		data-tags='<?=$tags_json?>'
+		<?php /* data-icon='<?=room_icon($room)?>'  Can pass absence of icon */ ?>
 	>
 		<td class="td_identifier" itemprop="identifier"><?=$id?></td>
 		<td class="td_language" title="Language flag for '<?=$name?>'"><?=$language?></td>
@@ -101,6 +103,7 @@
 				?></span>
 <?php endif; endforeach; ?>
 			</span>
+			<img src="<?=room_icon($room, "64x64")?>"></img>
 		</td>
 		<td
 			class="td_description"