Client: add call for resendCode request

TLSharp.Core/TelegramClient.cs

@@ -207,6 +207,21 @@ public bool IsUserAuthorized()
             return request.Response.PhoneCodeHash;
         }
 
+        public async Task<string> ResendCodeRequestAsync(string phoneNumber, string phoneCodeHash, CancellationToken token = default(CancellationToken))
+        {
+            if (String.IsNullOrWhiteSpace(phoneNumber))
+                throw new ArgumentNullException(nameof(phoneNumber));
+
+            if(String.IsNullOrWhiteSpace(phoneCodeHash))
+                throw new ArgumentNullException(nameof(phoneCodeHash));
+
+            var request = new TLRequestResendCode() { PhoneNumber = phoneNumber, PhoneCodeHash = phoneCodeHash };
+
+            await RequestWithDcMigration(request, token).ConfigureAwait(false);
+
+            return request.Response.PhoneCodeHash;
+        }
+
         public async Task<TLUser> MakeAuthAsync(string phoneNumber, string phoneCodeHash, string code, CancellationToken token = default(CancellationToken))
         {
             if (String.IsNullOrWhiteSpace(phoneNumber))

TLSharp.Tests.NUnit/Test.cs

@@ -21,6 +21,12 @@ public async override Task AuthUser()
             await base.AuthUser();
         }
 
+        [Test]
+        public async override Task AuthUserByResendCode()
+        {
+            await base.AuthUserByResendCode();
+        }
+
         [Test]
         public override async Task SendMessageTest()
         {

TLSharp.Tests.VS/TLSharpTestsVs.cs

@@ -20,6 +20,12 @@ public override async Task AuthUser()
             await base.AuthUser();
         }
 
+        [TestMethod]
+        public override async Task AuthUserByResendCode()
+        {
+            await base.AuthUserByResendCode();
+        }
+
         [TestMethod]
         public override async Task SendMessageTest()
         {

TLSharp.Tests/TLSharpTests.cs

@@ -155,6 +155,44 @@ public virtual async Task AuthUser()
             Assert.IsTrue(client.IsUserAuthorized());
         }
 
+        public virtual async Task AuthUserByResendCode()
+        {
+            var client = NewClient();
+
+            await client.ConnectAsync();
+
+            var hash = await client.SendCodeRequestAsync(NumberToAuthenticate);
+
+            var resendHash = await client.ResendCodeRequestAsync(NumberToAuthenticate, hash);
+
+            var code = CodeToAuthenticate; // you can change code in debugger too
+
+            if (String.IsNullOrWhiteSpace(code))
+            {
+                throw new Exception("CodeToAuthenticate is empty in the app.config file, fill it with the code you just got now by SMS/Telegram");
+            }
+
+            TLUser user = null;
+            try
+            {
+                user = await client.MakeAuthAsync(NumberToAuthenticate, resendHash, code);
+            }
+            catch (CloudPasswordNeededException ex)
+            {
+                var passwordSetting = await client.GetPasswordSetting();
+                var password = PasswordToAuthenticate;
+
+                user = await client.MakeAuthWithPasswordAsync(passwordSetting, password);
+            }
+            catch (InvalidPhoneCodeException ex)
+            {
+                throw new Exception("CodeToAuthenticate is wrong in the app.config file, fill it with the code you just got now by SMS/Telegram",
+                    ex);
+            }
+            Assert.IsNotNull(user);
+            Assert.IsTrue(client.IsUserAuthorized());
+        }
+
         public virtual async Task SendMessageTest()
         {
             NumberToSendMessage = ConfigurationManager.AppSettings[nameof(NumberToSendMessage)];