AlexArchive · March 11, 2015 08:58 · Mar 11, 2015
diff --git a/AccountController.cs b/AccountController.cs
@@ -0,0 +1,63 @@
+public class AccountController : Controller
+{
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public ActionResult Login()
+    {
+        var redirectUri = Url.Action(
+            "ExternalLoginCallback",
+            "Account");
+        return new ChallengeResult(redirectUri);
+    }
+
+    public ActionResult ExternalLoginCallback()
+    {
+        var context = new ApplicationContext();
+        var userStore = new UserStore<IdentityUser>(context);
+        var userManager = new UserManager<IdentityUser>(userStore);
+        var authentication = HttpContext.GetOwinContext().Authentication;
+        var signInManager = new SignInManager<IdentityUser, string>(userManager, authentication);
+        var account = authentication.GetExternalLoginInfo();
+        var status = signInManager.ExternalSignIn(account, false);
+        switch (status)
+        {
+            case SignInStatus.Success:
+            {
+                return RedirectToAction("Index", "Home");
+            }
+            case SignInStatus.Failure:
+            {
+                var user = new IdentityUser
+                {
+                    UserName = account.DefaultUserName,
+                    Email = account.Email
+                };
+                var operation = userManager.Create(user);
+                if (operation.Succeeded)
+                {
+                    operation = userManager.AddLogin(user.Id, account.Login);
+
+                    if (operation.Succeeded)
+                    {
+                        signInManager.SignIn(
+                            user: user,
+                            isPersistent: false,
+                            rememberBrowser: false);
+                        return RedirectToAction("Index", "Home");
+                    }
+                }
+            }
+                break;
+        }
+        throw new HttpException(500, "This should not be happening.");
+    }
+
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public ActionResult Logout()
+    {
+        var authentication = HttpContext.GetOwinContext().Authentication;
+        authentication.SignOut();
+        return RedirectToAction("Index", "Home");
+    }
+}
diff --git a/ChallengeResult.cs b/ChallengeResult.cs
@@ -0,0 +1,18 @@
+public class ChallengeResult : HttpUnauthorizedResult
+{
+    public string RedirectUri { get; set; }
+
+    public ChallengeResult(string redirectUri)
+    {
+        RedirectUri = redirectUri;
+    }
+
+    public override void ExecuteResult(ControllerContext context)
+    {
+        var properties = new AuthenticationProperties {RedirectUri = RedirectUri};
+        context.HttpContext
+            .GetOwinContext()
+            .Authentication
+            .Challenge(properties, "GitHub");
+    }
+}
diff --git a/Startup.cs b/Startup.cs
@@ -0,0 +1,19 @@
+public class Startup
+{
+    public void Configuration(IAppBuilder app)
+    {
+        app.UseCookieAuthentication(new CookieAuthenticationOptions
+        {
+            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
+        });
+
+        app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
+
+        app.UseGitHubAuthentication(new GitHubAuthenticationOptions
+        {
+            ClientId = "dc2119b9f611c6fec9c6",
+            ClientSecret = "d028ee0e40ed333e53efa5dd2aba3e0e56bbfbee",
+            Scope = { "" }
+        });
+    }
+}