Support the request to resend the verification_code through alternate methods.

.github/dev.yml

@@ -2,7 +2,7 @@ pr: none
 trigger:
 - master
 
-name: 1.7.7-dev.$(Rev:r)
+name: 1.8.1-dev.$(Rev:r)
 
 pool:
   vmImage: ubuntu-latest

.github/release.yml

@@ -1,7 +1,7 @@
 pr: none
 trigger: none
 
-name: 1.7.$(Rev:r)
+name: 1.8.$(Rev:r)
 
 pool:
   vmImage: ubuntu-latest

README.md

@@ -60,6 +60,7 @@ using var client = new WTelegram.Client(Config);
 There are other configuration items that are queried to your method but returning `null` let WTelegramClient choose a default adequate value.
 Those shown above are the only ones that have no default values and should be provided by your method.
 Returning `null` for verification_code or password will show a prompt for console apps, or an error otherwise.
+Returning an empty string for verification_code requests resending the code through another method (SMS or Call).
 
 Another simple approach is to pass `Environment.GetEnvironmentVariable` as the config callback and define the configuration items as environment variables.
 Undefined variables get the default `null` behavior.

src/Client.cs

@@ -1020,13 +1020,26 @@ namespace WTelegram
 			{
 				sentCode = await this.Auth_SendCode(phone_number, _apiId, _apiHash, settings ??= new());
 			}
+		resent:
+			var timeout = DateTime.UtcNow + TimeSpan.FromSeconds(sentCode.timeout);
+			OnUpdate(sentCode);
 			Helpers.Log(3, $"A verification code has been sent via {sentCode.type.GetType().Name[17..]}");
 			Auth_AuthorizationBase authorization = null;
-			//TODO: implement auth.resendCode logic
 			for (int retry = 1; authorization == null; retry++)
 				try
 				{
 					var verification_code = await ConfigAsync("verification_code");
+					if (verification_code == "" && sentCode.next_type != 0)
+					{
+						var mustWait = timeout - DateTime.UtcNow;
+						if (mustWait.Ticks > 0)
+						{
+							Helpers.Log(3, $"You must wait {(int)(mustWait.TotalSeconds + 0.5)} more seconds before requesting the code to be sent via {sentCode.next_type}");
+							continue;
+						}
+						sentCode = await this.Auth_ResendCode(phone_number, sentCode.phone_code_hash);
+						goto resent;
+					}
 					authorization = await this.Auth_SignIn(phone_number, sentCode.phone_code_hash, verification_code);
 				}
 				catch (RpcException e) when (e.Code == 401 && e.Message == "SESSION_PASSWORD_NEEDED")