Agregar archivos de proyecto.

GmailTokenManager.cs

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+using Google.Apis.Auth.OAuth2;
+using Google.Apis.Util.Store;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+public static class GmailTokenManager
+{
+    public static async Task<string> ObtenerAccessTokenAsync(GmailConfig config)
+    {
+        //var stream = new FileStream(config.ClientSecretPath, FileMode.Open, FileAccess.Read);
+        var stream = new MemoryStream(config.ClientSecret);
+
+        //var credencial = await GoogleWebAuthorizationBroker.AuthorizeAsync(
+        //    GoogleClientSecrets.FromStream(stream).Secrets,
+        //    new[] { "https://www.googleapis.com/auth/gmail.send" },
+        //    config.Usuario,
+        //    CancellationToken.None,
+        //    new FileDataStore(config.TokenFolder, true)
+        //);
+        var credencial = await GoogleWebAuthorizationBroker.AuthorizeAsync(
+          GoogleClientSecrets.FromStream(stream).Secrets,
+          new[] { "https://mail.google.com/" },
+          config.Usuario,
+          CancellationToken.None,
+          new FileDataStore(config.TokenFolder, true)
+      );
+
+        return await credencial.GetAccessTokenForRequestAsync();
+    }
+}