Added generic error pages

10 files changed, 272 insertions, 8 deletions

diff --git a/config/app.php b/config/app.php
index ea394b8e..19118f1d 100644
--- a/config/app.php
+++ b/config/app.php
@@ -26,6 +26,7 @@ return [
         \Engelsystem\Middleware\SendResponseHandler::class,
         \Engelsystem\Middleware\ExceptionHandler::class,
         \Engelsystem\Middleware\SetLocale::class,
+        \Engelsystem\Middleware\ErrorHandler::class,
         \Engelsystem\Middleware\RouteDispatcher::class,
         \Engelsystem\Middleware\RequestHandler::class,
     ],
diff --git a/src/Http/Response.php b/src/Http/Response.php
index 9db6fa83..d79ab98b 100644
--- a/src/Http/Response.php
+++ b/src/Http/Response.php
@@ -2,6 +2,7 @@
 
 namespace Engelsystem\Http;
 
+use Engelsystem\Renderer\Renderer;
 use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
 
@@ -9,6 +10,25 @@ class Response extends SymfonyResponse implements ResponseInterface
 {
     use MessageTrait;
 
+    /** @var Renderer */
+    protected $view;
+
+    /**
+     * @param string   $content
+     * @param int      $status
+     * @param array    $headers
+     * @param Renderer $view
+     */
+    public function __construct(
+        $content = '',
+        int $status = 200,
+        array $headers = array(),
+        Renderer $view = null
+    ) {
+        $this->view = $view;
+        parent::__construct($content, $status, $headers);
+    }
+
     /**
      * Return an instance with the specified status code and, optionally, reason phrase.
      *
@@ -72,4 +92,25 @@ class Response extends SymfonyResponse implements ResponseInterface
 
         return $new;
     }
+
+    /**
+     * Return an instance with the rendered content.
+     *
+     * THis method retains the immutability of the message and returns
+     * an instance with the updated status and headers
+     *
+     * @param string              $view
+     * @param array               $data
+     * @param int                 $status
+     * @param string[]|string[][] $headers
+     * @return Response
+     */
+    public function withView($view, $data = [], $status = 200, $headers = [])
+    {
+        if (!$this->view instanceof Renderer) {
+            throw new \InvalidArgumentException('Renderer not defined');
+        }
+
+        return $this->create($this->view->render($view, $data), $status, $headers);
+    }
 }
diff --git a/src/Middleware/ErrorHandler.php b/src/Middleware/ErrorHandler.php
new file mode 100644
index 00000000..a7c4cfe6
--- /dev/null
+++ b/src/Middleware/ErrorHandler.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Engelsystem\Middleware;
+
+use Engelsystem\Http\Response;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Twig_LoaderInterface as TwigLoader;
+
+class ErrorHandler implements MiddlewareInterface
+{
+    /** @var TwigLoader */
+    protected $loader;
+
+    /** @var string */
+    protected $viewPrefix = 'errors/';
+
+    /**
+     * @param TwigLoader $loader
+     */
+    public function __construct(TwigLoader $loader)
+    {
+        $this->loader = $loader;
+    }
+
+    /**
+     * Handles any error messages
+     *
+     * Should be added at the beginning
+     *
+     * @param ServerRequestInterface  $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(
+        ServerRequestInterface $request,
+        RequestHandlerInterface $handler
+    ): ResponseInterface {
+        $response = $handler->handle($request);
+
+        $statusCode = $response->getStatusCode();
+        if ($statusCode < 400 || !$response instanceof Response) {
+            return $response;
+        }
+
+        $view = $this->selectView($statusCode);
+
+        return $response->withView(
+            $this->viewPrefix . $view,
+            [
+                'status'  => $statusCode,
+                'content' => $response->getContent(),
+            ],
+            $statusCode,
+            $response->getHeaders()
+        );
+    }
+
+    /**
+     * Select a view based on the given status code
+     *
+     * @param int $statusCode
+     * @return string
+     */
+    protected function selectView(int $statusCode): string
+    {
+        $hundreds = intdiv($statusCode, 100);
+
+        $viewsList = [$statusCode, $hundreds, $hundreds * 100];
+        foreach ($viewsList as $view) {
+            if ($this->loader->exists($this->viewPrefix . $view)) {
+                return $view;
+            }
+        }
+
+        return 'default';
+    }
+}
diff --git a/src/Middleware/LegacyMiddleware.php b/src/Middleware/LegacyMiddleware.php
index bf849611..78132815 100644
--- a/src/Middleware/LegacyMiddleware.php
+++ b/src/Middleware/LegacyMiddleware.php
@@ -83,7 +83,7 @@ class LegacyMiddleware implements MiddlewareInterface
         }
 
         if (empty($title) and empty($content)) {
-            $page = '404';
+            $page = 404;
             $title = _('Page not found');
             $content = _('This page could not be found or you don\'t have permission to view it. You probably have to sign in or register in order to gain access!');
         }
@@ -277,10 +277,8 @@ class LegacyMiddleware implements MiddlewareInterface
             $parameters['meetings'] = 1;
         }
 
-        $status = 200;
-        if ($page == '404') {
-            $status = 404;
-            $content = info($content, true);
+        if (!empty($page) && is_int($page)) {
+            return response($content, (int)$page);
         }
 
         return response(view('layouts/app', [
@@ -290,6 +288,6 @@ class LegacyMiddleware implements MiddlewareInterface
             'content'        => msg() . $content,
             'header_toolbar' => header_toolbar(),
             'event_info'     => EventConfig_info($event_config) . ' <br />'
-        ]), $status);
+        ]), 200);
     }
 }
diff --git a/src/Renderer/RendererServiceProvider.php b/src/Renderer/RendererServiceProvider.php
index 3e8d69bc..2e41837b 100644
--- a/src/Renderer/RendererServiceProvider.php
+++ b/src/Renderer/RendererServiceProvider.php
@@ -24,12 +24,14 @@ class RendererServiceProvider extends ServiceProvider
     protected function registerRenderer()
     {
         $renderer = $this->app->make(Renderer::class);
+        $this->app->instance(Renderer::class, $renderer);
         $this->app->instance('renderer', $renderer);
     }
 
     protected function registerHtmlEngine()
     {
         $htmlEngine = $this->app->make(HtmlEngine::class);
+        $this->app->instance(HtmlEngine::class, $htmlEngine);
         $this->app->instance('renderer.htmlEngine', $htmlEngine);
         $this->app->tag('renderer.htmlEngine', ['renderer.engine']);
     }
diff --git a/templates/errors/default.twig b/templates/errors/default.twig
new file mode 100644
index 00000000..a04afc4e
--- /dev/null
+++ b/templates/errors/default.twig
@@ -0,0 +1,7 @@
+{% extends "layouts/app.twig" %}
+
+{% block title %}Error {{ status }}{% endblock %}
+
+{% block content %}
+    <div class="alert alert-info">{{ content }}</div>
+{% endblock %}
diff --git a/tests/Unit/Http/ResponseTest.php b/tests/Unit/Http/ResponseTest.php
index f6c24767..d7dc37c0 100644
--- a/tests/Unit/Http/ResponseTest.php
+++ b/tests/Unit/Http/ResponseTest.php
@@ -3,6 +3,8 @@
 namespace Engelsystem\Test\Unit\Http;
 
 use Engelsystem\Http\Response;
+use Engelsystem\Renderer\Renderer;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
@@ -46,4 +48,37 @@ class ResponseTest extends TestCase
         $this->assertNotEquals($response, $newResponse);
         $this->assertEquals('Lorem Ipsum?', $newResponse->getContent());
     }
-}
+
+    /**
+     * @covers \Engelsystem\Http\Response::withView
+     */
+    public function testWithView()
+    {
+        /** @var REnderer|MockObject $renderer */
+        $renderer = $this->createMock(Renderer::class);
+
+        $renderer->expects($this->once())
+            ->method('render')
+            ->with('foo', ['lorem' => 'ipsum'])
+            ->willReturn('Foo ipsum!');
+
+        $response = new Response('', 200, [], $renderer);
+        $newResponse = $response->withView('foo', ['lorem' => 'ipsum'], 505, ['test' => 'er']);
+
+        $this->assertNotEquals($response, $newResponse);
+        $this->assertEquals('Foo ipsum!', $newResponse->getContent());
+        $this->assertEquals(505, $newResponse->getStatusCode());
+        $this->assertArraySubset(['test' => ['er']], $newResponse->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Response::withView
+     */
+    public function testWithViewNoRenderer()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        $response = new Response();
+        $response->withView('foo');
+    }
+}
\ No newline at end of file
diff --git a/tests/Unit/Middleware/ErrorHandlerTest.php b/tests/Unit/Middleware/ErrorHandlerTest.php
new file mode 100644
index 00000000..abf9c52f
--- /dev/null
+++ b/tests/Unit/Middleware/ErrorHandlerTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Http\Response;
+use Engelsystem\Middleware\ErrorHandler;
+use Engelsystem\Test\Unit\Middleware\Stub\ReturnResponseMiddlewareHandler;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Twig_LoaderInterface as TwigLoader;
+
+class ErrorHandlerTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\ErrorHandler::__construct
+     * @covers \Engelsystem\Middleware\ErrorHandler::process
+     * @covers \Engelsystem\Middleware\ErrorHandler::selectView
+     */
+    public function testProcess()
+    {
+        /** @var TwigLoader|MockObject $twigLoader */
+        $twigLoader = $this->createMock(TwigLoader::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $psrResponse */
+        $psrResponse = $this->getMockForAbstractClass(ResponseInterface::class);
+        $returnResponseHandler = new ReturnResponseMiddlewareHandler($psrResponse);
+
+        $psrResponse->expects($this->once())
+            ->method('getStatusCode')
+            ->willReturn(505);
+
+        $errorHandler = new ErrorHandler($twigLoader);
+
+        $return = $errorHandler->process($request, $returnResponseHandler);
+        $this->assertEquals($psrResponse, $return, 'Plain PSR-7 Response should be passed directly');
+
+        /** @var Response|MockObject $response */
+        $response = $this->createMock(Response::class);
+
+        $response->expects($this->exactly(3))
+            ->method('getStatusCode')
+            ->willReturnOnConsecutiveCalls(
+                200,
+                418,
+                505
+            );
+
+        $returnResponseHandler->setResponse($response);
+        $return = $errorHandler->process($request, $returnResponseHandler);
+        $this->assertEquals($response, $return, 'Only Responses >= 400 should be processed');
+
+        $twigLoader->expects($this->exactly(4))
+            ->method('exists')
+            ->withConsecutive(
+                ['errors/418'],
+                ['errors/4'],
+                ['errors/400'],
+                ['errors/505']
+            )
+            ->willReturnOnConsecutiveCalls(
+                false,
+                false,
+                false,
+                true
+            );
+
+        $response->expects($this->exactly(2))
+            ->method('getContent')
+            ->willReturnOnConsecutiveCalls(
+                'Teapot',
+                'Internal Error!'
+            );
+
+        $response->expects($this->exactly(2))
+            ->method('withView')
+            ->withConsecutive(
+                ['errors/default', ['status' => 418, 'content' => 'Teapot'], 418],
+                ['errors/505', ['status' => 505, 'content' => 'Internal Error!'], 505]
+            )
+            ->willReturn($response);
+
+        $errorHandler->process($request, $returnResponseHandler);
+        $errorHandler->process($request, $returnResponseHandler);
+    }
+}
diff --git a/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
index 323e07b4..370187dd 100644
--- a/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
+++ b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
@@ -27,4 +27,14 @@ class ReturnResponseMiddlewareHandler implements RequestHandlerInterface
     {
         return $this->response;
     }
+
+    /**
+     * Set the response
+     *
+     * @param ResponseInterface $response
+     */
+    public function setResponse(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
 }
diff --git a/tests/Unit/Renderer/RendererServiceProviderTest.php b/tests/Unit/Renderer/RendererServiceProviderTest.php
index 3826da7e..6cdf4363 100644
--- a/tests/Unit/Renderer/RendererServiceProviderTest.php
+++ b/tests/Unit/Renderer/RendererServiceProviderTest.php
@@ -37,10 +37,12 @@ class RendererServiceProviderTest extends ServiceProviderTest
                 $htmlEngine
             );
 
-        $app->expects($this->exactly(2))
+        $app->expects($this->exactly(4))
             ->method('instance')
             ->withConsecutive(
+                [Renderer::class, $renderer],
                 ['renderer', $renderer],
+                [HtmlEngine::class, $htmlEngine],
                 ['renderer.htmlEngine', $htmlEngine]
             );