Fully implement channel_about_page

lib/src/channels/channel_client.dart

@@ -1,3 +1,6 @@
+import 'package:youtube_explode_dart/src/channels/channels.dart';
+import 'package:youtube_explode_dart/src/reverse_engineering/responses/channel_about_page.dart';
+
 import '../extensions/helpers_extension.dart';
 import '../playlists/playlists.dart';
 import '../reverse_engineering/responses/channel_upload_page.dart';
@@ -40,6 +43,48 @@ class ChannelClient {
         channelPage.channelLogoUrl);
   }
 
+  /// Gets the info found on a YouTube Channel About page.
+  /// [id] must be either a [ChannelId] or a string
+  /// which is parsed to a [ChannelId]
+  Future<ChannelAbout> getAboutPage(dynamic id) async {
+    id = ChannelId.fromString(id);
+
+    var channelAboutPage = await ChannelAboutPage.get(_httpClient, id.value);
+    var iData = channelAboutPage.initialData;
+    assert(iData != null);
+    return ChannelAbout(
+        id.description,
+        id.viewCount,
+        id.joinDate,
+        id.title,
+        id.avatar
+            .map((e) => ChannelThumbnail(Uri.parse(e.url), e.height, e.width)),
+        id.country,
+        id.channelLinks);
+  }
+
+  /// Gets the info found on a YouTube Channel About page.
+  /// [username] must be either a [Username] or a string
+  /// which is parsed to a [Username]
+  Future<ChannelAbout> getAboutPageByUsername(dynamic username) async {
+    username = Username.fromString(username);
+
+    var channelAboutPage =
+        await ChannelAboutPage.getByUsername(_httpClient, username.value);
+    var id = channelAboutPage.initialData;
+    assert(id != null);
+    return ChannelAbout(
+        id.description,
+        id.viewCount,
+        id.joinDate,
+        id.title,
+        id.avatar
+            .map((e) => ChannelThumbnail(Uri.parse(e.url), e.height, e.width))
+            .toList(),
+        id.country,
+        id.channelLinks);
+  }
+
   /// Gets the metadata associated with the channel
   /// that uploaded the specified video.
   Future<Channel> getByVideo(dynamic videoId) async {

lib/src/channels/channel_link.dart

@@ -17,4 +17,7 @@ class ChannelLink with EquatableMixin {
 
   @override
   List<Object> get props => [title, url, icon];
+
+  @override
+  String toString() => 'Link: $title ($url): $icon';
 }

lib/src/reverse_engineering/responses/channel_about_page.dart

@@ -124,10 +124,14 @@ class _InitialData {
   String get description => content.description.simpleText;
 
   List<ChannelLink> get channelLinks {
-    return content.primaryLinks.map((e) => ChannelLink(
-        e.title.simpleText,
-        extractUrl(e.navigationEndpoint.urlEndpoint.url),
-        Uri.parse(e.icon.thumbnails.first.url)));
+    return content.primaryLinks
+        .map((e) => ChannelLink(
+            e.title.simpleText,
+            extractUrl(e.navigationEndpoint?.commandMetadata?.webCommandMetadata
+                    ?.url ??
+                e.navigationEndpoint.urlEndpoint.url),
+            Uri.parse(e.icon.thumbnails.first.url)))
+        .toList();
   }
 
   int get viewCount =>
@@ -137,12 +141,13 @@ class _InitialData {
 
   String get title => content.title.simpleText;
 
-  dynamic get avatar => content.avatar.thumbnails;
+  List<AvatarThumbnail> get avatar => content.avatar.thumbnails;
+
+  String get country => content.country.simpleText;
 
-  /// todo: continue from here with more data!
   String parseRuns(List<dynamic> runs) =>
       runs?.map((e) => e.text)?.join() ?? '';
 
   Uri extractUrl(String text) =>
-      Uri.parse(Uri.decodeFull(_urlExp.firstMatch(text).group(1)));
+      Uri.parse(Uri.decodeFull(_urlExp.firstMatch(text)?.group(1) ?? ''));
 }

lib/src/reverse_engineering/responses/generated/channel_about_page_id.g.dart

@@ -1921,6 +1921,9 @@ class AvatarThumbnail {
         "width": width == null ? null : width,
         "height": height == null ? null : height,
       };
+
+  @override
+  String toString() => '${toJson()}';
 }
 
 class DismissButtonClass {

test/channel_about_test.dart

@@ -0,0 +1,29 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Channel About', () {
+    YoutubeExplode yt;
+    setUp(() {
+      yt = YoutubeExplode();
+    });
+
+    tearDown(() {
+      yt.close();
+    });
+
+    test('GetAboutPageOfChannel', () async {
+      var channelUrl =
+          'https://www.youtube.com/user/FavijTV';
+      var channel = await yt.channels.getAboutPageByUsername(channelUrl);
+      expect(channel.country, 'Italy');
+      expect(channel.thumbnails, isNotEmpty);
+      expect(channel.channelLinks, isNotEmpty);
+      expect(channel.description, isNotEmpty);
+      expect(channel.joinDate, isNotEmpty);
+      expect(channel.title, 'FavijTV');
+      expect(channel.viewCount, greaterThanOrEqualTo(3631224938));
+
+    });
+  });
+}