multiple runtime bugfixes for 1.5.5+65

lib/utils/url_opener.dart

@@ -1,12 +1,35 @@
-import 'package:flutter_linkify/flutter_linkify.dart';
-import 'package:url_launcher/url_launcher_string.dart';
+import 'dart:developer';
 
+import 'package:flutter_linkify/flutter_linkify.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+/// Single entry point for opening links that come from outside the app (chat
+/// messages, ticker content, emergency notices).
 class UrlOpener {
+  /// Schemes we hand to the platform. Message content is user supplied, so
+  /// anything that could address another app directly stays out.
+  static const _allowedSchemes = {'http', 'https', 'mailto', 'tel'};
+
   static Future<void> onOpen(LinkableElement link) => openUrl(link.url);
 
   static Future<void> openUrl(String url) async {
-    if (await canLaunchUrlString(url)) {
-      await launchUrlString(url);
+    final uri = Uri.tryParse(url);
+    if (uri == null || !_allowedSchemes.contains(uri.scheme.toLowerCase())) {
+      return;
+    }
+
+    // externalApplication first: it hands the link to the app that owns it
+    // (YouTube, Maps, the mail client) instead of iOS' in-app Safari sheet,
+    // which throws a PlatformException whenever its load fails.
+    for (final mode in const [
+      LaunchMode.externalApplication,
+      LaunchMode.platformDefault,
+    ]) {
+      try {
+        if (await launchUrl(uri, mode: mode)) return;
+      } catch (e) {
+        log('launching $uri as $mode failed: $e');
+      }
     }
   }
 }