Adds attemptWith() with tests.

src/Illuminate/Auth/SessionGuard.php

@@ -17,6 +17,7 @@
 use Illuminate\Contracts\Cookie\QueueingFactory as CookieJar;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Contracts\Session\Session;
+use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Str;
 use Illuminate\Support\Traits\Macroable;
@@ -374,6 +375,34 @@ public function attempt(array $credentials = [], $remember = false)
         return false;
     }
 
+    /**
+     * Attempt to authenticate a user with credentials and additional callbacks.
+     *
+     * @param  array  $credentials
+     * @param  false  $remember
+     * @param  array|callable  $callbacks
+     * @return bool
+     */
+    public function attemptWith(array $credentials = [], $remember = false, $callbacks = null)
+    {
+        $this->fireAttemptEvent($credentials, $remember);
+
+        $this->lastAttempted = $user = $this->provider->retrieveByCredentials($credentials);
+
+        // This method does the exact same thing as Attempt, but also executes callbacks after
+        // the user is retrieved and validated. If one of the callbacks returns falsy, we
+        // won't login this user. Instead, we will fail this authentication attempt.
+        if ($this->hasValidCredentials($user, $credentials) && $this->shouldLogin($callbacks, $user)) {
+            $this->login($user, $remember);
+
+            return true;
+        }
+
+        $this->fireFailedEvent($user, $credentials);
+
+        return false;
+    }
+
     /**
      * Determine if the user matches the credentials.
      *
@@ -392,6 +421,24 @@ protected function hasValidCredentials($user, $credentials)
         return $validated;
     }
 
+    /**
+     * Checks if the user should login by executing the given callbacks.
+     *
+     * @param  array|callable|null  $callbacks
+     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
+     * @return bool
+     */
+    protected function shouldLogin($callbacks, AuthenticatableContract $user)
+    {
+        foreach (Arr::wrap($callbacks) as $callback) {
+            if (! $callback($user, $this)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     /**
      * Log the given user ID into the application.
      *

tests/Auth/AuthGuardTest.php

@@ -126,6 +126,48 @@ public function testAttemptReturnsFalseIfUserNotGiven()
         $this->assertFalse($mock->attempt(['foo']));
     }
 
+    public function testAttemptAndWithCallbacks()
+    {
+        [$session, $provider, $request, $cookie] = $this->getMocks();
+        $mock = $this->getMockBuilder(SessionGuard::class)->onlyMethods(['getName'])->setConstructorArgs(['default', $provider, $session, $request])->getMock();
+        $mock->setDispatcher($events = m::mock(Dispatcher::class));
+        $user = m::mock(Authenticatable::class);
+        $events->shouldReceive('dispatch')->times(3)->with(m::type(Attempting::class));
+        $events->shouldReceive('dispatch')->once()->with(m::type(Login::class));
+        $events->shouldReceive('dispatch')->once()->with(m::type(Authenticated::class));
+        $events->shouldReceive('dispatch')->twice()->with(m::type(Validated::class));
+        $events->shouldReceive('dispatch')->twice()->with(m::type(Failed::class));
+        $mock->expects($this->once())->method('getName')->willReturn('foo');
+        $user->shouldReceive('getAuthIdentifier')->once()->andReturn('bar');
+        $mock->getSession()->shouldReceive('put')->with('foo', 'bar')->once();
+        $session->shouldReceive('migrate')->once();
+        $mock->getProvider()->shouldReceive('retrieveByCredentials')->times(3)->with(['foo'])->andReturn($user);
+        $mock->getProvider()->shouldReceive('validateCredentials')->twice()->andReturnTrue();
+        $mock->getProvider()->shouldReceive('validateCredentials')->once()->andReturnFalse();
+
+        $this->assertTrue($mock->attemptWith(['foo'], false, function ($user, $guard) {
+            static::assertInstanceOf(Authenticatable::class, $user);
+            static::assertInstanceOf(SessionGuard::class, $guard);
+
+            return true;
+        }));
+
+        $this->assertFalse($mock->attemptWith(['foo'], false, function ($user, $guard) {
+            static::assertInstanceOf(Authenticatable::class, $user);
+            static::assertInstanceOf(SessionGuard::class, $guard);
+
+            return false;
+        }));
+
+        $executed = false;
+
+        $this->assertFalse($mock->attemptWith(['foo'], false, function () use (&$executed) {
+            return $executed = true;
+        }));
+
+        $this->assertFalse($executed);
+    }
+
     public function testLoginStoresIdentifierInSession()
     {
         [$session, $provider, $request, $cookie] = $this->getMocks();