use gomuks for URL previews

lib/controllers/url_preview.dart

@@ -1,50 +1,22 @@
-import "dart:convert";
 import "package:flutter_riverpod/flutter_riverpod.dart";
-import "package:http/http.dart";
-import "package:nexus/controllers/client_state.dart";
-import "package:nexus/controllers/header.dart";
+import "package:nexus/controllers/client.dart";
 import "package:nexus/models/open_graph_data.dart";
 
 class UrlPreviewController extends AsyncNotifier<OpenGraphData?> {
-  final String link;
-  UrlPreviewController(this.link);
+  final Uri url;
+  UrlPreviewController(this.url);
 
   @override
   Future<OpenGraphData?> build() async {
-    try {
-      final homeserver = ref.watch(
-        ClientStateController.provider.select((value) => value?.homeserverUrl),
-      );
+    if (url.host == "matrix.to") return null;
 
-      if (homeserver != null && !link.contains("matrix.to")) {
-        {
-          final response = await get(
-            .parse(homeserver)
-                .resolve("/_matrix/client/v1/media/preview_url")
-                .replace(queryParameters: {"url": link}),
-            headers: await ref.watch(HeaderController.provider.future),
-          );
-
-          if (response.statusCode == 200) {
-            final decodedValue = json.decode(response.body);
-            if (decodedValue is! Map<String, dynamic>) return null;
-
-            return .fromJson(
-              decodedValue,
-            ).copyWith(imageUrl: decodedValue["og:image"]);
-          }
-        }
-      }
-    } catch (_) {
-      return null;
-    }
-    return null;
+    return await ref
+        .watch(ClientController.provider.notifier)
+        .getUrlPreview(url);
   }
 
   static final provider =
-      AsyncNotifierProvider.family<
-        UrlPreviewController,
-        OpenGraphData?,
-        String
-      >(UrlPreviewController.new);
+      AsyncNotifierProvider.family<UrlPreviewController, OpenGraphData?, Uri>(
+        UrlPreviewController.new,
+      );
 }