Updated

library/includes/functions.php

@@ -2236,3 +2236,40 @@ function infoByIP(string $ipAddress, int $port = 0): array
 
     return $data;
 }
+
+/**
+ * Generates canonical url
+ *
+ * @return string
+ */
+function getCanonicalUrl(): string
+{
+    $fullUrl = rtrim(FULL_URL, '/');
+    $script = $_SERVER['SCRIPT_NAME'];
+
+    $allowedParams = [
+        POST_CAT_URL,
+        POST_FORUM_URL,
+        POST_GROUPS_URL,
+        POST_POST_URL,
+        POST_TOPIC_URL,
+        POST_USERS_URL,
+    ];
+
+    $params = [];
+    foreach ($allowedParams as $key) {
+        if (isset($_GET[$key])) {
+            $params[$key] = $_GET[$key];
+        }
+    }
+
+    if (!empty($params)) {
+        ksort($params);
+        $queryString = http_build_query($params, '', '&', PHP_QUERY_RFC3986);
+        $url = $fullUrl . $script . "?$queryString";
+    } else {
+        $url = $fullUrl . $script;
+    }
+
+    return htmlCHR($url);
+}

library/includes/page_header.php

@@ -123,7 +123,7 @@ $template->assign_vars([
 
     'USE_TABLESORTER' => !empty($page_cfg['use_tablesorter']),
     'ALLOW_ROBOTS' => !$bb_cfg['board_disable'] && (!isset($page_cfg['allow_robots']) || $page_cfg['allow_robots'] === true),
-    'META_CANONICAL' => $page_cfg['canonical_link'] ?? '',
+    'META_CANONICAL' => $page_cfg['canonical_link'] ?? getCanonicalUrl(),
     'META_DESCRIPTION' => $page_cfg['meta_description'] ?? '',
 
     'SITENAME' => $bb_cfg['sitename'],

profile.php

@@ -15,6 +15,9 @@ require __DIR__ . '/common.php';
 // Start session management
 $user->session_start();
 
+// Disable canonical for this page
+$page_cfg['canonical_link'] = false;
+
 set_die_append_msg();
 $mode = request_var('mode', 'viewprofile');