Added theme add social driver redirect configuration callback

Allows someone using the theme system to configure the social driver
before a redirect action occurs, by passing a callback as an additional
param to the theme 'addSocialDriver' method.

app/Auth/Access/SocialAuthService.php

@@ -19,10 +19,37 @@ use Symfony\Component\HttpFoundation\RedirectResponse;
 
 class SocialAuthService
 {
+    /**
+     * The core socialite library used.
+     * @var Socialite
+     */
     protected $socialite;
-    protected $socialAccount;
 
-    protected $validSocialDrivers = ['google', 'github', 'facebook', 'slack', 'twitter', 'azure', 'okta', 'gitlab', 'twitch', 'discord'];
+    /**
+     * The default built-in social drivers we support.
+     * @var string[]
+     */
+    protected $validSocialDrivers = [
+        'google',
+        'github',
+        'facebook',
+        'slack',
+        'twitter',
+        'azure',
+        'okta',
+        'gitlab',
+        'twitch',
+        'discord'
+    ];
+
+    /**
+     * Callbacks to run when configuring a social driver
+     * for an initial redirect action.
+     * Array is keyed by social driver name.
+     * Callbacks are passed an instance of the driver.
+     * @var array<string, callable>
+     */
+    protected $configureForRedirectCallbacks = [];
 
     /**
      * SocialAuthService constructor.
@@ -39,7 +66,7 @@ class SocialAuthService
     public function startLogIn(string $socialDriver): RedirectResponse
     {
         $driver = $this->validateDriver($socialDriver);
-        return $this->getSocialDriver($driver)->redirect();
+        return $this->getDriverForRedirect($driver)->redirect();
     }
 
     /**
@@ -49,7 +76,7 @@ class SocialAuthService
     public function startRegister(string $socialDriver): RedirectResponse
     {
         $driver = $this->validateDriver($socialDriver);
-        return $this->getSocialDriver($driver)->redirect();
+        return $this->getDriverForRedirect($driver)->redirect();
     }
 
     /**
@@ -227,7 +254,7 @@ class SocialAuthService
     /**
      * Provide redirect options per service for the Laravel Socialite driver
      */
-    public function getSocialDriver(string $driverName): Provider
+    protected function getDriverForRedirect(string $driverName): Provider
     {
         $driver = $this->socialite->driver($driverName);
 
@@ -238,6 +265,10 @@ class SocialAuthService
             $driver->with(['resource' => 'https://graph.windows.net']);
         }
 
+        if (isset($this->configureForRedirectCallbacks[$driverName])) {
+            $this->configureForRedirectCallbacks[$driverName]($driver);
+        }
+
         return $driver;
     }
 
@@ -248,12 +279,19 @@ class SocialAuthService
      * within the `Config/services.php` file.
      * Handler should be a Class@method handler to the SocialiteWasCalled event.
      */
-    public function addSocialDriver(string $driverName, array $config, string $socialiteHandler)
+    public function addSocialDriver(
-    {
+        string $driverName,
+        array $config,
+        string $socialiteHandler,
+        callable $configureForRedirect = null
+    ) {
         $this->validSocialDrivers[] = $driverName;
         config()->set('services.' . $driverName, $config);
         config()->set('services.' . $driverName . '.redirect', url('/login/service/' . $driverName . '/callback'));
         config()->set('services.' . $driverName . '.name', $config['name'] ?? $driverName);
         Event::listen(SocialiteWasCalled::class, $socialiteHandler);
+        if (!is_null($configureForRedirect)) {
+            $this->configureForRedirectCallbacks[$driverName] = $configureForRedirect;
+        }
     }
 }

app/Theming/ThemeService.php

@@ -53,9 +53,9 @@ class ThemeService
     /**
      * @see SocialAuthService::addSocialDriver
      */
-    public function addSocialDriver(string $driverName, array $config, string $socialiteHandler)
+    public function addSocialDriver(string $driverName, array $config, string $socialiteHandler, callable $configureForRedirect = null)
     {
         $socialAuthService = app()->make(SocialAuthService::class);
-        $socialAuthService->addSocialDriver($driverName, $config, $socialiteHandler);
+        $socialAuthService->addSocialDriver($driverName, $config, $socialiteHandler, $configureForRedirect);
     }
 }

dev/docs/logical-theme-system.md

@@ -96,3 +96,17 @@ Theme::listen(ThemeEvents::APP_BOOT, function($app) {
     ], '\SocialiteProviders\Reddit\RedditExtendSocialite@handle');
 });
 ```
+
+In some cases you may need to customize the driver before it performs a redirect. 
+This can be done by providing a callback as a fourth parameter like so:
+
+```php
+Theme::addSocialDriver('reddit', [
+    'client_id' => 'abc123',
+    'client_secret' => 'def456789',
+    'name' => 'Reddit',
+], '\SocialiteProviders\Reddit\RedditExtendSocialite@handle', function($driver) {
+    $driver->with(['prompt' => 'select_account']);
+    $driver->scopes(['open_id']);
+});
+```

tests/ThemeTest.php

@@ -1,6 +1,5 @@
 <?php namespace Tests;
 
-use BookStack\Auth\Access\SocialAuthService;
 use BookStack\Auth\User;
 use BookStack\Entities\Models\Page;
 use BookStack\Entities\Tools\PageContent;
@@ -149,7 +148,7 @@ class ThemeTest extends TestCase
         $this->setSettings(['registration-enabled' => 'true']);
 
         $user = factory(User::class)->make();
-        $this->post('/register', ['email' => $user->email, 'name' => $user->name,  'password' => 'password']);
+        $this->post('/register', ['email' => $user->email, 'name' => $user->name, 'password' => 'password']);
 
         $this->assertCount(2, $args);
         $this->assertEquals('standard', $args[0]);
@@ -184,6 +183,28 @@ class ThemeTest extends TestCase
         $loginResp->assertSee('Super Cat Name');
     }
 
+
+    public function test_add_social_driver_allows_a_configure_for_redirect_callback_to_be_passed()
+    {
+        Theme::addSocialDriver(
+            'discord',
+            [
+                'client_id' => 'abc123',
+                'client_secret' => 'def456',
+                'name' => 'Super Cat Name',
+            ],
+            'SocialiteProviders\Discord\DiscordExtendSocialite@handle',
+            function ($driver) {
+                $driver->with(['donkey' => 'donut']);
+            }
+        );
+
+        $loginResp = $this->get('/login/service/discord');
+        $redirect = $loginResp->headers->get('location');
+        $this->assertStringContainsString('donkey=donut', $redirect);
+    }
+
+
     protected function usingThemeFolder(callable $callback)
     {
         // Create a folder and configure a theme