Updated authorization helpers and main class name

YouTubeScraper/YouTube.API.Test/ClosedCaptionsTest.cs

@@ -9,7 +9,7 @@ namespace YouTube.API.Test
         [Test]
         public void ValidCaptionsTest()
         {
-            YouTubeService service = new YouTubeService();
+            ExtendedYouTubeService service = new ExtendedYouTubeService();
             ClosedCaptionInfo info = service.VideoPlayback.List("VC5-YkjMHuw").Execute().ClosedCaptions.FirstOrDefault();
             ClosedCaptionTrack track = service.Captions.Load(info).Execute();
             Assert.IsNotNull(track);

YouTubeScraper/YouTube.API.Test/DashManifestTest.cs

@@ -16,7 +16,7 @@ namespace YouTube.API.Test
         [Test]
         public void ValidManifestTest()
         {
-            YouTubeService service = new YouTubeService();
+            ExtendedYouTubeService service = new ExtendedYouTubeService();
             IReadOnlyList<DashManifest> manifests = service.DashManifests.List("NkGbcQwWxqk").Execute();
             foreach (var i in manifests)
                 Console.WriteLine(i.Label);

YouTubeScraper/YouTube.API.Test/VideoPlaybackTest.cs

@@ -11,7 +11,7 @@ namespace YouTube.API.Test
         [Test]
         public void ValidVideoPlaybackTest()
         {
-            YouTubeService service = new YouTubeService();
+            ExtendedYouTubeService service = new ExtendedYouTubeService();
             VideoPlayback info = service.VideoPlayback.List("VC5-YkjMHuw").Execute();
             Assert.NotNull(info);
         }

YouTubeScraper/YouTube.API.Test/WatchLaterTest.cs

@@ -14,7 +14,7 @@ namespace YouTube.API.Test
     public class WatchLaterTest
     {
         const string testVideoId = "NkGbcQwWxqk";
-        YouTubeService service;
+        ExtendedYouTubeService service;
 
         [SetUp]
         public void Setup()
@@ -27,7 +27,7 @@ namespace YouTube.API.Test
             task.Wait();
 
             UserCredential credential = task.Result;
-            service = new YouTubeService(new BaseClientService.Initializer
+            service = new ExtendedYouTubeService(new BaseClientService.Initializer
             {
                 HttpClientInitializer = credential,
                 ApplicationName = "FoxTube"

YouTubeScraper/YouTubeScraper/Authorization/AuthorizationHelpers.cs

@@ -16,17 +16,15 @@ namespace YouTube.Authorization
     public static class AuthorizationHelpers
     {
         public static Uri Endpoint => "https://accounts.google.com/o/oauth2/approval".ToUri();
-        public static string RedirectUrl => Uri.EscapeDataString(redirectUrl);
-
+        const string refreshEndpoint = "https://oauth2.googleapis.com/token";
         const string tokenEndpoint = "https://www.googleapis.com/oauth2/v4/token";
-        const string redirectUrl = "urn:ietf:wg:oauth:2.0:oob";
 
-        public static Uri FormQueryString(ClientSecrets clientSecrets, params string[] scopes)
+        public static Uri FormQueryString(ClientSecrets clientSecrets, Uri redirectUri, params string[] scopes)
         {
             string clientId = Uri.EscapeDataString(clientSecrets.ClientId);
             string scopeStr = string.Join(' ', scopes);
 
-            return $"https://accounts.google.com/o/oauth2/auth?client_id={clientId}&redirect_uri={RedirectUrl}&response_type=code&scope={scopeStr}".ToUri();
+            return $"https://accounts.google.com/o/oauth2/auth?client_id={clientId}&redirect_uri={redirectUri.AbsoluteUri}&response_type=code&scope={scopeStr}".ToUri();
         }
 
         public static async Task<UserCredential> ExchangeToken(ClientSecrets clientSecrets, string responseToken)
@@ -36,7 +34,7 @@ namespace YouTube.Authorization
             Dictionary<string, string> requestBody = new Dictionary<string, string>
             {
                 { "code", responseToken },
-                { "redirect_uri", redirectUrl },
+                //{ "redirect_uri", redirectUrl },
                 { "grant_type", "authorization_code" },
                 { "client_id", clientSecrets.ClientId },
                 { "client_secret", clientSecrets.ClientSecret }
@@ -59,13 +57,53 @@ namespace YouTube.Authorization
                 TokenType = responseData.token_type
             };
 
-            AuthorizationCodeFlow authorizationCodeFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer()
+            AuthorizationCodeFlow authorizationCodeFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer
             {
                 ClientSecrets = clientSecrets,
                 Scopes = responseData.scope.ToString().Split(' ')
             });
 
-            return new UserCredential(authorizationCodeFlow, "user", tokenResponse);
+            UserCredential credential = new UserCredential(authorizationCodeFlow, "user", tokenResponse);
+
+            return credential;
+        }
+
+        public static async Task<UserCredential> RestoreUser(ClientSecrets clientSecrets, string refreshToken)
+        {
+            using HttpClient client = new HttpClient();
+
+            Dictionary<string, string> requestBody = new Dictionary<string, string>
+            {
+                { "client_id", clientSecrets.ClientId },
+                { "client_secret", clientSecrets.ClientSecret },
+                { "refresh_token", refreshToken },
+                { "grant_type", "refresh_token" }
+            };
+
+            HttpResponseMessage response = await client.PostAsync(refreshEndpoint, new FormUrlEncodedContent(requestBody));
+
+            if (!response.IsSuccessStatusCode)
+                return null;
+
+            string responseString = await response.Content.ReadAsStringAsync();
+            dynamic responseData = JsonConvert.DeserializeObject(responseString);
+
+            TokenResponse tokenResponse = new TokenResponse
+            {
+                AccessToken = responseData.access_token,
+                ExpiresInSeconds = responseData.expires_in,
+                RefreshToken = refreshToken,
+                TokenType = responseData.token_type
+            };
+
+            AuthorizationCodeFlow authorizationCodeFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer
+            {
+                ClientSecrets = clientSecrets
+            });
+
+            UserCredential credential = new UserCredential(authorizationCodeFlow, "user", tokenResponse);
+
+            return credential;
         }
     }
 }

YouTubeScraper/YouTubeScraper/YouTubeService.cs

@@ -2,7 +2,7 @@
 
 namespace YouTube
 {
-    public partial class YouTubeService : Google.Apis.YouTube.v3.YouTubeService
+    public partial class ExtendedYouTubeService : Google.Apis.YouTube.v3.YouTubeService
     {
         public DashManifestsResource DashManifests => new DashManifestsResource(this);
         public VideoPlaybackResource VideoPlayback => new VideoPlaybackResource(this);
@@ -11,8 +11,8 @@ namespace YouTube
         public WatchLaterResource WatchLater => new WatchLaterResource(this);
         // TODO: Add Activities override for recomendations and subscriptions
         
-        public YouTubeService() : base() { }
+        public ExtendedYouTubeService() : base() { }
 
-        public YouTubeService(Initializer initializer) : base(initializer) { }
+        public ExtendedYouTubeService(Initializer initializer) : base(initializer) { }
     }
 }