1.0-dev15 (Core code cleaning)

VDownload.Core/Services/Sources/Twitch/Helpers/Auth.cs

@@ -0,0 +1,123 @@
+using Newtonsoft.Json.Linq;
+using System;
+using System.IO;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+using Windows.Storage;
+
+namespace VDownload.Core.Services.Sources.Twitch.Helpers
+{
+    public class Auth
+    {
+        #region CONSTANTS
+
+        // CLIENT ID
+        public readonly static string ClientID = "yukkqkwp61wsv3u1pya17crpyaa98y";
+
+        // GQL API CLIENT ID
+        public readonly static string GQLApiClientID = "kimne78kx3ncx6brgo4mv6wki5h1ko";
+
+        // REDIRECT URL
+        public readonly static Uri RedirectUrl = new Uri("https://www.vd.com");
+
+        // AUTHORIZATION URL
+        private readonly static string ResponseType = "token";
+        private readonly static string[] Scopes = new[]
+        { 
+            "user:read:subscriptions",
+        };
+        public readonly static Uri AuthorizationUrl = new Uri($"https://id.twitch.tv/oauth2/authorize?client_id={ClientID}&redirect_uri={RedirectUrl.OriginalString}&response_type={ResponseType}&scope={string.Join(" ", Scopes)}");
+        
+        #endregion
+
+
+
+        #region METHODS
+
+        // READ ACCESS TOKEN
+        public static async Task<string> ReadAccessTokenAsync()
+        {
+            try
+            {
+                // Get file
+                StorageFolder authDataFolder = await ApplicationData.Current.LocalCacheFolder.GetFolderAsync("AuthData");
+                StorageFile authDataFile = await authDataFolder.GetFileAsync("Twitch.auth");
+
+                // Return data
+                return await FileIO.ReadTextAsync(authDataFile);
+            }
+            catch (FileNotFoundException) 
+            {
+                return null;
+            }
+        }
+
+        // SAVE ACCESS TOKEN
+        public static async Task SaveAccessTokenAsync(string accessToken)
+        {
+            // Get file
+            StorageFolder authDataFolder = await ApplicationData.Current.LocalCacheFolder.CreateFolderAsync("AuthData", CreationCollisionOption.OpenIfExists);
+            StorageFile authDataFile = await authDataFolder.CreateFileAsync("Twitch.auth", CreationCollisionOption.ReplaceExisting);
+
+            // Save data
+            await FileIO.WriteTextAsync(authDataFile, accessToken);
+        }
+
+        // DELETE ACCESS TOKEN
+        public static async Task DeleteAccessTokenAsync()
+        {
+            try
+            {
+                // Get file
+                StorageFolder authDataFolder = await ApplicationData.Current.LocalCacheFolder.GetFolderAsync("AuthData");
+                StorageFile authDataFile = await authDataFolder.GetFileAsync("Twitch.auth");
+
+                // Delete file
+                await authDataFile.DeleteAsync();
+            }
+            catch (FileNotFoundException) { }
+        } 
+
+        // VALIDATE ACCESS TOKEN
+        public static async Task<(bool IsValid, string Login, DateTime? ExpirationDate)> ValidateAccessTokenAsync(string accessToken)
+        {
+            // Create client
+            WebClient client = new WebClient { Encoding = Encoding.UTF8 };
+            client.Headers.Add("Authorization", $"Bearer {accessToken}");
+
+            try
+            {
+                // Check access token
+                JObject response = JObject.Parse(await client.DownloadStringTaskAsync("https://id.twitch.tv/oauth2/validate"));
+
+                string login = response["login"].ToString();
+                DateTime? expirationDate = DateTime.Now.AddSeconds(long.Parse(response["expires_in"].ToString()));
+
+                return (true, login, expirationDate);
+            }
+            catch (WebException wex)
+            {
+                if (wex.Response != null)
+                {
+                    JObject wexInfo = JObject.Parse(new StreamReader(wex.Response.GetResponseStream()).ReadToEnd());
+                    if ((int)wexInfo["status"] == 401) return (false, null, null);
+                    else throw;
+                }
+                else throw;
+            }
+        }
+
+        // REVOKE ACCESS TOKEN
+        public static async Task RevokeAccessTokenAsync(string accessToken)
+        {
+            // Create client
+            WebClient client = new WebClient { Encoding = Encoding.UTF8 };
+
+            // Revoke access token
+            await client.UploadStringTaskAsync(new Uri("https://id.twitch.tv/oauth2/revoke"), $"client_id={ClientID}&token={accessToken}");
+        }
+
+        #endregion
+    }
+}