feed finder

app/lib/data/models/web_page_info.dart

@@ -1,16 +1,24 @@
 import 'package:copy_with_extension/copy_with_extension.dart';
+import 'package:fast_equatable/fast_equatable.dart';
 import 'package:lensai/features/geckoview/domain/entities/browser_icon.dart';
 
 part 'web_page_info.g.dart';
 
 @CopyWith()
-class WebPageInfo {
+class WebPageInfo with FastEquatable {
   final Uri url;
   final String? title;
   final BrowserIcon? favicon;
+  final Set<String>? feeds;
 
   bool get isPageInfoComplete =>
       (title?.isNotEmpty ?? false) && favicon != null;
 
-  WebPageInfo({required this.url, this.title, this.favicon});
+  WebPageInfo({required this.url, this.title, this.favicon, this.feeds});
+
+  @override
+  bool get cacheHash => true;
+
+  @override
+  List<Object?> get hashParameters => [url, title, favicon, feeds];
 }

app/lib/data/models/web_page_info.g.dart

@@ -13,6 +13,8 @@ abstract class _$WebPageInfoCWProxy {
 
   WebPageInfo favicon(BrowserIcon? favicon);
 
+  WebPageInfo feeds(Set<String>? feeds);
+
   /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `WebPageInfo(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
   ///
   /// Usage
@@ -23,6 +25,7 @@ abstract class _$WebPageInfoCWProxy {
     Uri url,
     String? title,
     BrowserIcon? favicon,
+    Set<String>? feeds,
   });
 }
 
@@ -41,6 +44,9 @@ class _$WebPageInfoCWProxyImpl implements _$WebPageInfoCWProxy {
   @override
   WebPageInfo favicon(BrowserIcon? favicon) => this(favicon: favicon);
 
+  @override
+  WebPageInfo feeds(Set<String>? feeds) => this(feeds: feeds);
+
   @override
 
   /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `WebPageInfo(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
@@ -53,6 +59,7 @@ class _$WebPageInfoCWProxyImpl implements _$WebPageInfoCWProxy {
     Object? url = const $CopyWithPlaceholder(),
     Object? title = const $CopyWithPlaceholder(),
     Object? favicon = const $CopyWithPlaceholder(),
+    Object? feeds = const $CopyWithPlaceholder(),
   }) {
     return WebPageInfo(
       url: url == const $CopyWithPlaceholder()
@@ -67,6 +74,10 @@ class _$WebPageInfoCWProxyImpl implements _$WebPageInfoCWProxy {
           ? _value.favicon
           // ignore: cast_nullable_to_non_nullable
           : favicon as BrowserIcon?,
+      feeds: feeds == const $CopyWithPlaceholder()
+          ? _value.feeds
+          // ignore: cast_nullable_to_non_nullable
+          : feeds as Set<String>?,
     );
   }
 }

app/lib/domain/services/generic_website.dart

@@ -13,6 +13,8 @@ import 'package:lensai/data/models/web_page_info.dart';
 import 'package:lensai/extensions/nullable.dart';
 import 'package:lensai/features/geckoview/domain/entities/browser_icon.dart';
 import 'package:lensai/features/user/domain/repositories/cache.dart';
+import 'package:lensai/presentation/controllers/website_title.dart';
+import 'package:lensai/utils/feed_finder.dart';
 import 'package:lensai/utils/lru_cache.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
@@ -198,10 +200,15 @@ class GenericWebsiteService extends _$GenericWebsiteService {
 
           final title = document.querySelector('title')?.text;
           final resources = _extractIcons(baseUri, document);
+          final feeds = await FeedFinder(
+            url: baseUri,
+            document: document,
+          ).parse(verifyCandidates: false);
 
           return {
             'title': title,
             'resources': resources.map(_serializeResource).toList(),
+            'feeds': feeds,
           };
         } finally {
           client.close();
@@ -221,6 +228,7 @@ class GenericWebsiteService extends _$GenericWebsiteService {
         url: url,
         title: result['title'] as String?,
         favicon: favicon,
+        feeds: result['feeds'] as Set<String>?,
       );
     }, exceptionHandler: handleHttpError);
   }
@@ -278,9 +286,10 @@ class GenericWebsiteService extends _$GenericWebsiteService {
       return cachedIcon;
     }
 
-    return fetchPageInfo(
+    final result = await ref.read(pageInfoProvider(url).future);
-      url,
+    final favicon = result.favicon!;
-    ).then((result) => result.flatMap((pageInfo) => pageInfo.favicon!).value);
+
+    return favicon;
   }
 
   // Future<Uri?> tryUpgradeToHttps(Uri httpUri) async {

app/lib/domain/services/generic_website.g.dart

@@ -7,7 +7,7 @@ part of 'generic_website.dart';
 // **************************************************************************
 
 String _$genericWebsiteServiceHash() =>
-    r'663759beb3ae7448f4d60339557ba11c1a3a687d';
+    r'12396df7370ebc31b0a53b786e5a3e27c6d05177';
 
 /// See also [GenericWebsiteService].
 @ProviderFor(GenericWebsiteService)

app/lib/features/geckoview/domain/entities/states/tab.dart

@@ -1,5 +1,4 @@
 import 'package:copy_with_extension/copy_with_extension.dart';
-import 'package:fast_equatable/fast_equatable.dart';
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:lensai/data/models/web_page_info.dart';
 import 'package:lensai/domain/entities/equatable_image.dart';
@@ -13,7 +12,7 @@ import 'package:lensai/features/geckoview/domain/entities/states/security.dart';
 part 'tab.g.dart';
 
 @CopyWith()
-class TabState extends WebPageInfo with FastEquatable {
+class TabState extends WebPageInfo {
   @CopyWithField(immutable: true)
   final String id;
 
@@ -85,10 +84,9 @@ class TabState extends WebPageInfo with FastEquatable {
 
   @override
   List<Object?> get hashParameters => [
+    ...super.hashParameters,
     id,
     contextId,
-    url,
-    title,
     icon,
     thumbnail,
     progress,

app/lib/utils/feed_finder.dart

@@ -0,0 +1,96 @@
+import 'package:html/dom.dart';
+import 'package:http/http.dart' as http;
+
+class FeedFinder {
+  final Uri url;
+  final Document document;
+
+  late final String _base;
+
+  FeedFinder({required this.url, required this.document}) {
+    final uri = url.removeFragment();
+    _base = '${uri.scheme}://${uri.authority}';
+  }
+
+  Future<Set<String>> _verifyCandidates(Set<String> candidates) async {
+    final results = <String>{};
+
+    final client = http.Client();
+    try {
+      for (final candidate in candidates) {
+        try {
+          await client.get(Uri.parse(candidate));
+        } catch (e) {
+          continue;
+        }
+
+        results.add(candidate);
+      }
+    } finally {
+      client.close();
+    }
+
+    return results;
+  }
+
+  void _parseBody(Set<String> candidates) {
+    for (final a in document.querySelectorAll('a')) {
+      var href = a.attributes['href'];
+      if (href != null) {
+        if (href.contains('rss') ||
+            href.contains('xml') ||
+            href.contains('feed')) {
+          // Fix relative URLs
+          href = href.startsWith('/') ? _base + href : href;
+          href = href.endsWith('/') ? href.substring(0, href.length - 2) : href;
+
+          // Fix naked URLs
+          href = !href.startsWith('http') ? '$_base/$href' : href;
+
+          candidates.add(href);
+        }
+      }
+    }
+  }
+
+  void _parseHead(Set<String> candidates) {
+    for (final link in document.querySelectorAll("link[rel='alternate']")) {
+      final type = link.attributes['type'];
+      if (type != null) {
+        if (type.contains('rss') || type.contains('xml')) {
+          var href = link.attributes['href'];
+          if (href != null) {
+            // Fix relative URLs
+            href = href.startsWith('/') ? _base + href : href;
+            candidates.add(href);
+          }
+        }
+      }
+    }
+  }
+
+  Future<Set<String>> parse({
+    bool parseHead = true,
+    bool parseBody = true,
+    bool verifyCandidates = true,
+  }) async {
+    final candidates = <String>{};
+
+    // Look for feed candidates in head
+    if (parseHead) {
+      _parseHead(candidates);
+    }
+
+    // Look for feed candidates in body
+    if (parseBody) {
+      _parseBody(candidates);
+    }
+
+    // Verify candidates
+    if (verifyCandidates) {
+      return _verifyCandidates(candidates);
+    }
+
+    return candidates;
+  }
+}