Added web-middleware based theme events

app/Http/Kernel.php

@@ -28,6 +28,7 @@ class Kernel extends HttpKernel
             \Illuminate\Session\Middleware\StartSession::class,
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \BookStack\Http\Middleware\VerifyCsrfToken::class,
+            \BookStack\Http\Middleware\RunThemeActions::class,
             \BookStack\Http\Middleware\Localization::class,
         ],
         'api' => [

app/Http/Middleware/RunThemeActions.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace BookStack\Http\Middleware;
+
+use BookStack\Facades\Theme;
+use BookStack\Theming\ThemeEvents;
+use Closure;
+
+class RunThemeActions
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        $earlyResponse = Theme::dispatch(ThemeEvents::WEB_MIDDLEWARE_BEFORE, $request);
+        if (!is_null($earlyResponse)) {
+            return $earlyResponse;
+        }
+
+        $response = $next($request);
+        $response = Theme::dispatch(ThemeEvents::WEB_MIDDLEWARE_AFTER, $request, $response) ?? $response;
+        return $response;
+    }
+}

app/Theming/ThemeEvents.php

@@ -20,6 +20,27 @@ class ThemeEvents
      */
     const APP_BOOT = 'app_boot';
 
+    /**
+     * Web before middleware action.
+     * Runs before the request is handled but after all other middleware apart from those
+     * that depend on the current session user (Localization for example).
+     * Provides the original request to use.
+     * Return values, if provided, will be used as a new response to use.
+     * @param \Illuminate\Http\Request $request
+     * @returns \Illuminate\Http\Response|null
+     */
+    const WEB_MIDDLEWARE_BEFORE = 'web_middleware_before';
+
+    /**
+     * Web after middleware action.
+     * Runs after the request is handled but before the response is sent.
+     * Provides both the original request and the currently resolved response.
+     * Return values, if provided, will be used as a new response to use.
+     * @param \Illuminate\Http\Request $request
+     * @returns \Illuminate\Http\Response|null
+     */
+    const WEB_MIDDLEWARE_AFTER = 'web_middleware_after';
+
     /**
      * Commonmark environment configure.
      * Provides the commonmark library environment for customization

tests/ThemeTest.php

@@ -5,6 +5,8 @@ use BookStack\Entities\Tools\PageContent;
 use BookStack\Facades\Theme;
 use BookStack\Theming\ThemeEvents;
 use File;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
 use League\CommonMark\ConfigurableEnvironmentInterface;
 
 class ThemeTest extends TestCase
@@ -14,7 +16,7 @@ class ThemeTest extends TestCase
 
     public function test_translation_text_can_be_overridden_via_theme()
     {
-        $this->usingThemeFolder(function() {
+        $this->usingThemeFolder(function () {
             $translationPath = theme_path('/lang/en');
             File::makeDirectory($translationPath, 0777, true);
 
@@ -30,11 +32,11 @@ class ThemeTest extends TestCase
 
     public function test_theme_functions_file_used_and_app_boot_event_runs()
     {
-        $this->usingThemeFolder(function($themeFolder) {
+        $this->usingThemeFolder(function ($themeFolder) {
             $functionsFile = theme_path('functions.php');
             app()->alias('cat', 'dog');
             file_put_contents($functionsFile, "<?php\nTheme::listen(\BookStack\Theming\ThemeEvents::APP_BOOT, function(\$app) { \$app->alias('cat', 'dog');});");
-            $this->runWithEnv('APP_THEME', $themeFolder, function() {
+            $this->runWithEnv('APP_THEME', $themeFolder, function () {
                 $this->assertEquals('cat', $this->app->getAlias('dog'));
             });
         });
@@ -43,7 +45,7 @@ class ThemeTest extends TestCase
     public function test_event_commonmark_environment_configure()
     {
         $callbackCalled = false;
-        $callback = function($environment) use (&$callbackCalled) {
+        $callback = function ($environment) use (&$callbackCalled) {
             $this->assertInstanceOf(ConfigurableEnvironmentInterface::class, $environment);
             $callbackCalled = true;
             return $environment;
@@ -57,6 +59,69 @@ class ThemeTest extends TestCase
         $this->assertTrue($callbackCalled);
     }
 
+    public function test_event_web_middleware_before()
+    {
+        $callbackCalled = false;
+        $requestParam = null;
+        $callback = function ($request) use (&$callbackCalled, &$requestParam) {
+            $requestParam = $request;
+            $callbackCalled = true;
+        };
+
+        Theme::listen(ThemeEvents::WEB_MIDDLEWARE_BEFORE, $callback);
+        $this->get('/login', ['Donkey' => 'cat']);
+
+        $this->assertTrue($callbackCalled);
+        $this->assertInstanceOf(Request::class, $requestParam);
+        $this->assertEquals('cat', $requestParam->header('donkey'));
+    }
+
+    public function test_event_web_middleware_before_return_val_used_as_response()
+    {
+        $callback = function (Request $request) {
+            return response('cat', 412);
+        };
+
+        Theme::listen(ThemeEvents::WEB_MIDDLEWARE_BEFORE, $callback);
+        $resp = $this->get('/login', ['Donkey' => 'cat']);
+        $resp->assertSee('cat');
+        $resp->assertStatus(412);
+    }
+
+    public function test_event_web_middleware_after()
+    {
+        $callbackCalled = false;
+        $requestParam = null;
+        $responseParam = null;
+        $callback = function ($request, Response $response) use (&$callbackCalled, &$requestParam, &$responseParam) {
+            $requestParam = $request;
+            $responseParam = $response;
+            $callbackCalled = true;
+            $response->header('donkey', 'cat123');
+        };
+
+        Theme::listen(ThemeEvents::WEB_MIDDLEWARE_AFTER, $callback);
+
+        $resp = $this->get('/login', ['Donkey' => 'cat']);
+        $this->assertTrue($callbackCalled);
+        $this->assertInstanceOf(Request::class, $requestParam);
+        $this->assertInstanceOf(Response::class, $responseParam);
+        $resp->assertHeader('donkey', 'cat123');
+    }
+
+    public function test_event_web_middleware_after_return_val_used_as_response()
+    {
+        $callback = function () {
+            return response('cat456', 443);
+        };
+
+        Theme::listen(ThemeEvents::WEB_MIDDLEWARE_AFTER, $callback);
+
+        $resp = $this->get('/login', ['Donkey' => 'cat']);
+        $resp->assertSee('cat456');
+        $resp->assertStatus(443);
+    }
+
     protected function usingThemeFolder(callable $callback)
     {
         // Create a folder and configure a theme