add ExceptionMiddleware

Author: dominikzogg

README.md

@@ -20,13 +20,14 @@ A simple http handler implementation for API.
  * psr/http-factory: ^1.0.1
  * psr/http-message: ^1.0.1
  * psr/http-server-middleware: ^1.0.1
+ * psr/log: ^1.1.2
 
 ## Installation
 
 Through [Composer](http://getcomposer.org) as [chubbyphp/chubbyphp-api-http][1].
 
 ```sh
-composer require chubbyphp/chubbyphp-api-http "^3.3"
+composer require chubbyphp/chubbyphp-api-http "^3.4"
 ```
 
 ## Usage
@@ -35,9 +36,10 @@ composer require chubbyphp/chubbyphp-api-http "^3.3"
  * [RequestManager][3]
  * [ResponseManager][4]
  * [AcceptAndContentTypeMiddleware][5]
- * [ApiHttpServiceFactory][6]
- * [ApiHttpServiceProvider][7]
- * [ApiProblemMapping (example)][8]
+ * [ApiExceptionMiddleware][6]
+ * [ApiHttpServiceFactory][7]
+ * [ApiHttpServiceProvider][8]
+ * [ApiProblemMapping (example)][9]
 
 ## Copyright
 
@@ -48,6 +50,7 @@ Dominik Zogg 2020
 [3]: doc/Manager/RequestManager.md
 [4]: doc/Manager/ResponseManager.md
 [5]: doc/Middleware/AcceptAndContentTypeMiddleware.md
-[6]: doc/ServiceFactory/ApiHttpServiceFactory.md
-[7]: doc/ServiceProvider/ApiHttpServiceProvider.md
-[8]: doc/Serialization/ApiProblemMapping.md
+[6]: doc/ServiceFactory/ApiExceptionMiddleware.md
+[7]: doc/ServiceFactory/ApiHttpServiceFactory.md
+[8]: doc/ServiceProvider/ApiHttpServiceProvider.md
+[9]: doc/Serialization/ApiProblemMapping.md

composer.json

@@ -16,7 +16,8 @@
         "chubbyphp/chubbyphp-serialization": "^2.12.2",
         "psr/http-factory": "^1.0.1",
         "psr/http-message": "^1.0.1",
-        "psr/http-server-middleware": "^1.0.1"
+        "psr/http-server-middleware": "^1.0.1",
+        "psr/log": "^1.1.2"
     },
     "require-dev": {
         "chubbyphp/chubbyphp-container": "^1.0",
@@ -42,7 +43,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "3.3-dev"
+            "dev-master": "3.4-dev"
         }
     },
     "scripts": {

doc/Middleware/ApiExceptionMiddleware.md

@@ -0,0 +1,33 @@
+# ApiExceptionMiddleware
+
+```php
+<?php
+
+use Chubbyphp\ApiHttp\Manager\ResponseManagerInterface;
+use Chubbyphp\ApiHttp\Middleware\ApiExceptionMiddleware;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Log\LoggerInterface;
+
+/** @var ServerRequestInterface $request */
+$request = ...;
+
+/** @var RequestHandlerInterface $handler */
+$handler = ...;
+
+/** @var ResponseManagerInterface $responseManager */
+$responseManager = ...;
+
+/** @var LoggerInterface $logger */
+$logger = ...;
+
+$middleware = new ApiExceptionMiddleware(
+    $responseManager,
+    true,
+    $logger
+);
+
+/** @var ResponseInterface $response */
+$response = $middleware->process($request, $handler);
+```

src/ApiProblem/ServerError/InternalServerError.php

@@ -8,6 +8,11 @@
 
 final class InternalServerError extends AbstractApiProblem
 {
+    /**
+     * @var array<int, array<mixed>>|null
+     */
+    private $backtrace;
+
     public function __construct(?string $detail = null, ?string $instance = null)
     {
         parent::__construct(
@@ -18,4 +23,20 @@ public function __construct(?string $detail = null, ?string $instance = null)
             $instance
         );
     }
+
+    /**
+     * @param array<int, array<mixed>>|null $backtrace
+     */
+    public function setBacktrace(?array $backtrace): void
+    {
+        $this->backtrace = $backtrace;
+    }
+
+    /**
+     * @return array<int, array<mixed>>|null
+     */
+    public function getBacktrace(): ?array
+    {
+        return $this->backtrace;
+    }
 }

src/Middleware/ApiExceptionMiddleware.php

@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chubbyphp\ApiHttp\Middleware;
+
+use Chubbyphp\ApiHttp\ApiProblem\ServerError\InternalServerError;
+use Chubbyphp\ApiHttp\Manager\ResponseManagerInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+final class ApiExceptionMiddleware implements MiddlewareInterface
+{
+    /**
+     * @var ResponseManagerInterface
+     */
+    private $responseManager;
+
+    /**
+     * @var bool
+     */
+    private $debug;
+
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    public function __construct(
+        ResponseManagerInterface $responseManager,
+        bool $debug = false,
+        ?LoggerInterface $logger = null
+    ) {
+        $this->responseManager = $responseManager;
+        $this->debug = $debug;
+        $this->logger = $logger ?? new NullLogger();
+    }
+
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        try {
+            return $handler->handle($request);
+        } catch (\Throwable $exception) {
+            return $this->handleException($request, $exception);
+        }
+    }
+
+    private function handleException(ServerRequestInterface $request, \Throwable $exception): ResponseInterface
+    {
+        $backtrace = $this->backtrace($exception);
+
+        $this->logger->error('Exception', ['backtrace' => $backtrace]);
+
+        if (null === $accept = $request->getAttribute('accept')) {
+            throw $exception;
+        }
+
+        if ($this->debug) {
+            $internalServerError = new InternalServerError($exception->getMessage());
+            $internalServerError->setBacktrace($backtrace);
+        } else {
+            $internalServerError = new InternalServerError();
+        }
+
+        return $this->responseManager->createFromApiProblem($internalServerError, $accept);
+    }
+
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    private function backtrace(\Throwable $exception): array
+    {
+        $exceptions = [];
+        do {
+            $exceptions[] = [
+                'class' => get_class($exception),
+                'message' => $exception->getMessage(),
+                'code' => $exception->getCode(),
+                'file' => $exception->getFile(),
+                'line' => $exception->getLine(),
+                'trace' => $exception->getTraceAsString(),
+            ];
+        } while ($exception = $exception->getPrevious());
+
+        return $exceptions;
+    }
+}

src/Serialization/ApiProblem/ServerError/InternalServerErrorMapping.php

@@ -6,11 +6,25 @@
 
 use Chubbyphp\ApiHttp\ApiProblem\ServerError\InternalServerError;
 use Chubbyphp\ApiHttp\Serialization\ApiProblem\AbstractApiProblemMapping;
+use Chubbyphp\Serialization\Mapping\NormalizationFieldMappingBuilder;
+use Chubbyphp\Serialization\Mapping\NormalizationFieldMappingInterface;
 
 final class InternalServerErrorMapping extends AbstractApiProblemMapping
 {
     public function getClass(): string
     {
         return InternalServerError::class;
     }
+
+    /**
+     * @return array<int, NormalizationFieldMappingInterface>
+     */
+    public function getNormalizationFieldMappings(string $path): array
+    {
+        $fieldMappings = parent::getNormalizationFieldMappings($path);
+
+        $fieldMappings[] = NormalizationFieldMappingBuilder::create('backtrace')->getMapping();
+
+        return $fieldMappings;
+    }
 }

tests/Unit/ApiProblem/ServerError/InternalServerErrorTest.php

@@ -24,17 +24,28 @@ public function testMinimal(): void
         self::assertSame('Internal Server Error', $apiProblem->getTitle());
         self::assertNull($apiProblem->getDetail());
         self::assertNull($apiProblem->getInstance());
+        self::assertNull($apiProblem->getBacktrace());
     }
 
     public function testMaximal(): void
     {
+        $backtrace = [
+            [
+                'class' => 'RuntimeException',
+                'message' => 'runtime exception',
+                'code' => 5000,
+            ],
+        ];
+
         $apiProblem = new InternalServerError('detail', '/cccdfd0f-0da3-4070-8e55-61bd832b47c0');
+        $apiProblem->setBacktrace($backtrace);
 
         self::assertSame(500, $apiProblem->getStatus());
         self::assertSame([], $apiProblem->getHeaders());
         self::assertSame('https://tools.ietf.org/html/rfc2616#section-10.5.1', $apiProblem->getType());
         self::assertSame('Internal Server Error', $apiProblem->getTitle());
         self::assertSame('detail', $apiProblem->getDetail());
         self::assertSame('/cccdfd0f-0da3-4070-8e55-61bd832b47c0', $apiProblem->getInstance());
+        self::assertSame($backtrace, $apiProblem->getBacktrace());
     }
 }