From a252a4b0199bb7797915caea142ea0887c5ac7d3 Mon Sep 17 00:00:00 2001
From: Vladimir Panteleev <git@thecybershadow.net>
Date: Thu, 19 Jan 2017 19:11:28 +0000
Subject: [PATCH] Allow removing the existing authenticator using a revocation
 code

---
 Program.cs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/Program.cs b/Program.cs
index 535a67b..9fb3114 100644
--- a/Program.cs
+++ b/Program.cs
@@ -377,8 +377,22 @@ namespace SteamGuard
 						Console.WriteLine("error: Unable to add your phone number. Steam returned GeneralFailure");
 						return;
 					case AuthenticatorLinker.LinkResult.AuthenticatorPresent:
-						Console.WriteLine("error: Can't link authenticator, remove the previous authenticator.");
-						return;
+						Console.WriteLine("An authenticator is already present.");
+						Console.WriteLine("If you have the revocation code (Rxxxxx), this program can remove it for you.");
+						Console.Write("Would you like to remove the current authenticator using your revocation code? (y/n) ");
+						var answer = Console.ReadLine();
+						if (answer != "y")
+							continue;
+						Console.Write("Revocation code (Rxxxxx): ");
+						var revocationCode = Console.ReadLine();
+						var account = new SteamGuardAccount();
+						account.Session = login.Session;
+						account.RevocationCode = revocationCode;
+						if (account.DeactivateAuthenticator())
+							Console.WriteLine("Successfully deactivated the current authenticator.");
+						else
+							Console.WriteLine("Deactivating the current authenticator was unsuccessful.");
+						continue;
 					default:
 						Console.WriteLine($"error: Unexpected linker result: {linkResult}");
 						return;