Merge branch 'develop' of github.com:shlinkio/shlink into develop

CHANGELOG.md

@@ -1,5 +1,11 @@
 ## CHANGELOG
 
+### 1.4.0
+
+**Enhancements:**
+
+* [89: Update to expressive 2](https://github.com/shlinkio/shlink/issues/89)
+
 ### 1.3.1
 
 **Tasks**

composer.json

@@ -1,29 +1,29 @@
 {
     "name": "shlinkio/shlink",
     "type": "project",
-    "homepage": "http://shlink.io",
+    "homepage": "https://shlink.io",
     "description": "A self-hosted and PHP-based URL shortener application with CLI and REST interfaces",
     "license": "MIT",
     "authors": [
         {
             "name": "Alejandro Celaya Alastrué",
-            "homepage": "http://www.alejandrocelaya.com",
+            "homepage": "https://www.alejandrocelaya.com",
             "email": "alejandro@alejandrocelaya.com"
         }
     ],
     "require": {
         "php": "^5.6 || ^7.0",
-        "zendframework/zend-expressive": "^1.0",
+        "zendframework/zend-expressive": "^2.0",
-        "zendframework/zend-expressive-fastroute": "^1.3",
+        "zendframework/zend-expressive-fastroute": "^2.0",
-        "zendframework/zend-expressive-twigrenderer": "^1.0",
+        "zendframework/zend-expressive-twigrenderer": "^1.4",
-        "zendframework/zend-stdlib": "^2.7",
+        "zendframework/zend-stdlib": "^3.0",
         "zendframework/zend-servicemanager": "^3.0",
         "zendframework/zend-paginator": "^2.6",
-        "zendframework/zend-config": "^2.6",
+        "zendframework/zend-config": "^3.0",
         "zendframework/zend-i18n": "^2.7",
-        "mtymek/expressive-config-manager": "^0.4",
+        "zendframework/zend-config-aggregator": "^0.1",
-        "acelaya/zsm-annotated-services": "^0.2.0",
+        "acelaya/zsm-annotated-services": "^1.0",
-        "acelaya/ze-content-based-error-handler": "^1.0",
+        "acelaya/ze-content-based-error-handler": "^2.0",
         "doctrine/orm": "^2.5",
         "guzzlehttp/guzzle": "^6.2",
         "symfony/console": "^3.0",
@@ -37,13 +37,12 @@
         "doctrine/migrations": "^1.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.0",
+        "phpunit/phpunit": "^5.7 || ^6.0",
         "squizlabs/php_codesniffer": "^2.3",
         "roave/security-advisories": "dev-master",
         "filp/whoops": "^2.0",
         "symfony/var-dumper": "^3.0",
-        "vlucas/phpdotenv": "^2.2",
+        "vlucas/phpdotenv": "^2.2"
-        "phly/changelog-generator": "^2.1"
     },
     "autoload": {
         "psr-4": {

config/autoload/dependencies.global.php

@@ -4,6 +4,7 @@ use Zend\Expressive\Container;
 use Zend\Expressive\Router;
 use Zend\Expressive\Template;
 use Zend\Expressive\Twig;
+use Zend\Stratigility\Middleware\ErrorHandler;
 
 return [
 
@@ -13,6 +14,7 @@ return [
             Template\TemplateRendererInterface::class => Twig\TwigRendererFactory::class,
             \Twig_Environment::class => Twig\TwigEnvironmentFactory::class,
             Router\RouterInterface::class => Router\FastRouteRouterFactory::class,
+            ErrorHandler::class => Container\ErrorHandlerFactory::class,
         ],
     ],
 

config/autoload/errorhandler.local.php.dist

@@ -1,6 +1,5 @@
 <?php
-use Acelaya\ExpressiveErrorHandler\ErrorHandler\ContentBasedErrorHandler;
+use Zend\Expressive\Container\WhoopsErrorResponseGeneratorFactory;
-use Zend\Expressive\Container\WhoopsErrorHandlerFactory;
 
 return [
     'dependencies' => [
@@ -21,7 +20,7 @@ return [
     'error_handler' => [
         'plugins' => [
             'factories' => [
-                ContentBasedErrorHandler::DEFAULT_CONTENT => WhoopsErrorHandlerFactory::class,
+                'text/html' => WhoopsErrorResponseGeneratorFactory::class,
             ],
         ],
     ],

config/autoload/middleware-pipeline.global.php

@@ -1,9 +1,30 @@
 <?php
+use Shlinkio\Shlink\Common\Middleware\LocaleMiddleware;
+use Shlinkio\Shlink\Rest\Middleware\BodyParserMiddleware;
+use Shlinkio\Shlink\Rest\Middleware\CheckAuthenticationMiddleware;
+use Shlinkio\Shlink\Rest\Middleware\CrossDomainMiddleware;
+use Shlinkio\Shlink\Rest\Middleware\PathVersionMiddleware;
 use Zend\Expressive\Container\ApplicationFactory;
+use Zend\Stratigility\Middleware\ErrorHandler;
 
 return [
 
     'middleware_pipeline' => [
+        'pre-routing' => [
+            'middleware' => [
+                ErrorHandler::class,
+                LocaleMiddleware::class,
+            ],
+            'priority' => 11,
+        ],
+        'pre-routing-rest' => [
+            'path' => '/rest',
+            'middleware' => [
+                PathVersionMiddleware::class,
+            ],
+            'priority' => 11,
+        ],
+
         'routing' => [
             'middleware' => [
                 ApplicationFactory::ROUTING_MIDDLEWARE,
@@ -11,6 +32,16 @@ return [
             'priority' => 10,
         ],
 
+        'rest' => [
+            'path' => '/rest',
+            'middleware' => [
+                CrossDomainMiddleware::class,
+                BodyParserMiddleware::class,
+                CheckAuthenticationMiddleware::class,
+            ],
+            'priority' => 5,
+        ],
+
         'post-routing' => [
             'middleware' => [
                 ApplicationFactory::DISPATCH_MIDDLEWARE,

config/config.php

@@ -4,7 +4,7 @@ use Shlinkio\Shlink\CLI;
 use Shlinkio\Shlink\Common;
 use Shlinkio\Shlink\Core;
 use Shlinkio\Shlink\Rest;
-use Zend\Expressive\ConfigManager;
+use Zend\ConfigAggregator;
 
 /**
  * Configuration files are loaded in a specific order. First ``global.php``, then ``*.global.php``.
@@ -15,11 +15,11 @@ use Zend\Expressive\ConfigManager;
  * Obviously, if you use closures in your config you can't cache it.
  */
 
-return (new ConfigManager\ConfigManager([
+return (new ConfigAggregator\ConfigAggregator([
     ExpressiveErrorHandler\ConfigProvider::class,
     Common\ConfigProvider::class,
     Core\ConfigProvider::class,
     CLI\ConfigProvider::class,
     Rest\ConfigProvider::class,
-    new ConfigManager\ZendConfigProvider('config/{autoload/{{,*.}global,{,*.}local},params/generated_config}.php'),
+    new ConfigAggregator\ZendConfigProvider('config/{autoload/{{,*.}global,{,*.}local},params/generated_config}.php'),
 ], 'data/cache/app_config.php'))->getMergedConfig();

module/CLI/test/Command/Api/DisableKeyCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Api;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Api\DisableKeyCommand;
 use Shlinkio\Shlink\Common\Exception\InvalidArgumentException;

module/CLI/test/Command/Api/GenerateKeyCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Api;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Api\GenerateKeyCommand;

module/CLI/test/Command/Api/ListKeysCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Api;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Api\ListKeysCommand;
 use Shlinkio\Shlink\Rest\Entity\ApiKey;

module/CLI/test/Command/Config/GenerateCharsetCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Config;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\CLI\Command\Config\GenerateCharsetCommand;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Symfony\Component\Console\Application;

module/CLI/test/Command/Install/InstallCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Install;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Install\InstallCommand;

module/CLI/test/Command/Shortcode/GeneratePreviewCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Shortcode;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Shortcode\GeneratePreviewCommand;

module/CLI/test/Command/Shortcode/GenerateShortcodeCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Shortcode;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Shortcode\GenerateShortcodeCommand;

module/CLI/test/Command/Shortcode/GetVisitsCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Shortcode;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Shortcode\GetVisitsCommand;

module/CLI/test/Command/Shortcode/ListShortcodesCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Shortcode;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Shortcode\ListShortcodesCommand;

module/CLI/test/Command/Shortcode/ResolveUrlCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Shortcode;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Shortcode\ResolveUrlCommand;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;

module/CLI/test/Command/Visit/ProcessVisitsCommandTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Command\Visit;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\CLI\Command\Visit\ProcessVisitsCommand;

module/CLI/test/ConfigProviderTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\CLI\ConfigProvider;
 
 class ConfigProviderTest extends TestCase

module/CLI/test/Factory/ApplicationFactoryTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\CLI\Factory;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\CLI\Factory\ApplicationFactory;
 use Shlinkio\Shlink\Core\Options\AppOptions;
 use Symfony\Component\Console\Application;

module/Common/config/middleware-pipeline.config.php

@@ -1,15 +0,0 @@
-<?php
-use Shlinkio\Shlink\Common\Middleware;
-
-return [
-
-    'middleware_pipeline' => [
-        'pre-routing' => [
-            'middleware' => [
-                Middleware\LocaleMiddleware::class,
-            ],
-            'priority' => 5,
-        ],
-    ],
-
-];

module/Common/src/Middleware/LocaleMiddleware.php

@@ -2,10 +2,11 @@
 namespace Shlinkio\Shlink\Common\Middleware;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Zend\I18n\Translator\Translator;
-use Zend\Stratigility\MiddlewareInterface;
 
 class LocaleMiddleware implements MiddlewareInterface
 {
@@ -25,40 +26,26 @@ class LocaleMiddleware implements MiddlewareInterface
         $this->translator = $translator;
     }
 
+
+
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         if (! $request->hasHeader('Accept-Language')) {
-            return $out($request, $response);
+            return $delegate->process($request);
         }
 
         $locale = $request->getHeaderLine('Accept-Language');
         $this->translator->setLocale($this->normalizeLocale($locale));
-        return $out($request, $response);
+        return $delegate->process($request);
     }
 
     /**

module/Common/test/ConfigProviderTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\ConfigProvider;
 
 class ConfigProviderTest extends TestCase
@@ -23,7 +23,6 @@ class ConfigProviderTest extends TestCase
     {
         $config = $this->configProvider->__invoke();
 
-        $this->assertArrayHasKey('middleware_pipeline', $config);
         $this->assertArrayHasKey('dependencies', $config);
         $this->assertArrayHasKey('twig', $config);
     }

module/Common/test/Factory/CacheFactoryTest.php

@@ -6,7 +6,7 @@ use Doctrine\Common\Cache\ArrayCache;
 use Doctrine\Common\Cache\FilesystemCache;
 use Doctrine\Common\Cache\MemcachedCache;
 use Doctrine\Common\Cache\RedisCache;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Factory\CacheFactory;
 use Shlinkio\Shlink\Core\Options\AppOptions;
 use Zend\ServiceManager\ServiceManager;

module/Common/test/Factory/EntityManagerFactoryTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Common\Factory;
 
 use Doctrine\ORM\EntityManager;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Factory\EntityManagerFactory;
 use Zend\ServiceManager\ServiceManager;
 

module/Common/test/Factory/LoggerFactoryTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Common\Factory;
 
 use Monolog\Logger;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
 use Shlinkio\Shlink\Common\Factory\LoggerFactory;
 use Zend\ServiceManager\ServiceManager;

module/Common/test/Factory/TranslatorFactoryTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Factory;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Factory\TranslatorFactory;
 use Zend\I18n\Translator\Translator;
 use Zend\ServiceManager\ServiceManager;

module/Common/test/Image/ImageBuilderFactoryTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Image;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Image\ImageBuilder;
 use Shlinkio\Shlink\Common\Image\ImageBuilderFactory;
 use Zend\ServiceManager\ServiceManager;

module/Common/test/Image/ImageFactoryTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Common\Image;
 
 use mikehaertl\wkhtmlto\Image;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Image\ImageFactory;
 use Zend\ServiceManager\ServiceManager;
 

module/Common/test/Middleware/LocaleMiddlewareTest.php

@@ -1,9 +1,9 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Middleware;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Middleware\LocaleMiddleware;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 
@@ -30,9 +30,7 @@ class LocaleMiddlewareTest extends TestCase
     public function whenNoHeaderIsPresentLocaleIsNotChanged()
     {
         $this->assertEquals('ru', $this->translator->getLocale());
-        $this->middleware->__invoke(ServerRequestFactory::fromGlobals(), new Response(), function ($req, $resp) {
+        $this->middleware->process(ServerRequestFactory::fromGlobals(), TestUtils::createDelegateMock()->reveal());
-            return $resp;
-        });
         $this->assertEquals('ru', $this->translator->getLocale());
     }
 
@@ -43,9 +41,7 @@ class LocaleMiddlewareTest extends TestCase
     {
         $this->assertEquals('ru', $this->translator->getLocale());
         $request = ServerRequestFactory::fromGlobals()->withHeader('Accept-Language', 'es');
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) {
+        $this->middleware->process($request, TestUtils::createDelegateMock()->reveal());
-            return $resp;
-        });
         $this->assertEquals('es', $this->translator->getLocale());
     }
 
@@ -54,18 +50,16 @@ class LocaleMiddlewareTest extends TestCase
      */
     public function localeGetsNormalized()
     {
+        $delegate = TestUtils::createDelegateMock();
+
         $this->assertEquals('ru', $this->translator->getLocale());
 
         $request = ServerRequestFactory::fromGlobals()->withHeader('Accept-Language', 'es_ES');
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) {
+        $this->middleware->process($request, $delegate->reveal());
-            return $resp;
-        });
         $this->assertEquals('es', $this->translator->getLocale());
 
         $request = ServerRequestFactory::fromGlobals()->withHeader('Accept-Language', 'en-US');
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) {
+        $this->middleware->process($request, $delegate->reveal());
-            return $resp;
-        });
         $this->assertEquals('en', $this->translator->getLocale());
     }
 }

module/Common/test/Paginator/PaginableRepositoryAdapterTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Paginator;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Paginator\Adapter\PaginableRepositoryAdapter;
 use Shlinkio\Shlink\Common\Repository\PaginableRepositoryInterface;

module/Common/test/Service/IpLocationResolverTest.php

@@ -4,7 +4,7 @@ namespace ShlinkioTest\Shlink\Common\Service;
 use GuzzleHttp\Client;
 use GuzzleHttp\Exception\TransferException;
 use GuzzleHttp\Psr7\Response;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Service\IpLocationResolver;
 

module/Common/test/Service/PreviewGeneratorTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Common\Service;
 
 use mikehaertl\wkhtmlto\Image;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Image\ImageBuilder;

module/Common/test/Twig/Extension/TranslatorExtensionTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Twig\Extension;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Twig\Extension\TranslatorExtension;

module/Common/test/Util/DateRangeTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Common\Util;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Util\DateRange;
 
 class DateRangeTest extends TestCase

module/Common/test/Util/TestUtils.php

@@ -0,0 +1,35 @@
+<?php
+namespace ShlinkioTest\Shlink\Common\Util;
+
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Prophecy\Argument;
+use Prophecy\Prophet;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Zend\Diactoros\Response;
+
+class TestUtils
+{
+    private static $prophet;
+
+    public static function createDelegateMock(ResponseInterface $response = null, RequestInterface $request = null)
+    {
+        $argument = $request ?: Argument::any();
+        $delegate = static::getProphet()->prophesize(DelegateInterface::class);
+        $delegate->process($argument)->willReturn($response ?: new Response());
+
+        return $delegate;
+    }
+
+    /**
+     * @return Prophet
+     */
+    private static function getProphet()
+    {
+        if (static::$prophet === null) {
+            static::$prophet = new Prophet();
+        }
+
+        return static::$prophet;
+    }
+}

module/Core/src/Action/PreviewAction.php

@@ -2,16 +2,16 @@
 namespace Shlinkio\Shlink\Core\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
-use Shlinkio\Shlink\Common\Exception\PreviewGenerationException;
 use Shlinkio\Shlink\Common\Service\PreviewGenerator;
 use Shlinkio\Shlink\Common\Service\PreviewGeneratorInterface;
 use Shlinkio\Shlink\Common\Util\ResponseUtilsTrait;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Shlinkio\Shlink\Core\Service\UrlShortenerInterface;
-use Zend\Stratigility\MiddlewareInterface;
 
 class PreviewAction implements MiddlewareInterface
 {
@@ -40,46 +40,28 @@ class PreviewAction implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         $shortCode = $request->getAttribute('shortCode');
 
         try {
             $url = $this->urlShortener->shortCodeToUrl($shortCode);
             if (! isset($url)) {
-                return $out($request, $response->withStatus(404), 'Not found');
+                return $delegate->process($request);
             }
 
             $imagePath = $this->previewGenerator->generatePreview($url);
             return $this->generateImageResponse($imagePath);
         } catch (InvalidShortCodeException $e) {
-            return $out($request, $response->withStatus(404), 'Not found');
+            return $delegate->process($request);
-        } catch (PreviewGenerationException $e) {
-            return $out($request, $response->withStatus(500), 'Preview generation error');
         }
     }
 }

module/Core/src/Action/QrCodeAction.php

@@ -3,6 +3,8 @@ namespace Shlinkio\Shlink\Core\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
 use Endroid\QrCode\QrCode;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -12,7 +14,6 @@ use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Shlinkio\Shlink\Core\Service\UrlShortenerInterface;
 use Zend\Expressive\Router\RouterInterface;
-use Zend\Stratigility\MiddlewareInterface;
 
 class QrCodeAction implements MiddlewareInterface
 {
@@ -48,42 +49,26 @@ class QrCodeAction implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         // Make sure the short URL exists for this short code
         $shortCode = $request->getAttribute('shortCode');
         try {
             $shortUrl = $this->urlShortener->shortCodeToUrl($shortCode);
-            if (! isset($shortUrl)) {
+            if ($shortUrl === null) {
-                return $out($request, $response->withStatus(404), 'Not Found');
+                return $delegate->process($request);
             }
         } catch (InvalidShortCodeException $e) {
             $this->logger->warning('Tried to create a QR code with an invalid short code' . PHP_EOL . $e);
-            return $out($request, $response->withStatus(404), 'Not Found');
+            return $delegate->process($request);
         }
 
         $path = $this->router->generateUri('long-url-redirect', ['shortCode' => $shortCode]);
@@ -101,13 +86,11 @@ class QrCodeAction implements MiddlewareInterface
      */
     protected function getSizeParam(Request $request)
     {
-        $size = intval($request->getAttribute('size', 300));
+        $size = (int) $request->getAttribute('size', 300);
         if ($size < 50) {
             return 50;
-        } elseif ($size > 1000) {
-            return 1000;
         }
 
-        return $size;
+        return $size > 1000 ? 1000 : $size;
     }
 }

module/Core/src/Action/RedirectAction.php

@@ -2,6 +2,8 @@
 namespace Shlinkio\Shlink\Core\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -11,7 +13,6 @@ use Shlinkio\Shlink\Core\Service\UrlShortenerInterface;
 use Shlinkio\Shlink\Core\Service\VisitsTracker;
 use Shlinkio\Shlink\Core\Service\VisitsTrackerInterface;
 use Zend\Diactoros\Response\RedirectResponse;
-use Zend\Stratigility\MiddlewareInterface;
 
 class RedirectAction implements MiddlewareInterface
 {
@@ -47,31 +48,15 @@ class RedirectAction implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         $shortCode = $request->getAttribute('shortCode', '');
 
@@ -80,8 +65,8 @@ class RedirectAction implements MiddlewareInterface
 
             // If provided shortCode does not belong to a valid long URL, dispatch next middleware, which will trigger
             // a not-found error
-            if (! isset($longUrl)) {
+            if ($longUrl === null) {
-                return $this->notFoundResponse($request, $response, $out);
+                return $delegate->process($request);
             }
 
             // Track visit to this short code
@@ -93,18 +78,7 @@ class RedirectAction implements MiddlewareInterface
         } catch (\Exception $e) {
             // In case of error, dispatch 404 error
             $this->logger->error('Error redirecting to long URL.' . PHP_EOL . $e);
-            return $this->notFoundResponse($request, $response, $out);
+            return $delegate->process($request);
         }
     }
-
-    /**
-     * @param Request $request
-     * @param Response $response
-     * @param callable $out
-     * @return Response
-     */
-    protected function notFoundResponse(Request $request, Response $response, callable $out)
-    {
-        return $out($request, $response->withStatus(404), 'Not Found');
-    }
 }

module/Core/src/Middleware/QrCodeCacheMiddleware.php

@@ -3,9 +3,11 @@ namespace Shlinkio\Shlink\Core\Middleware;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
 use Doctrine\Common\Cache\Cache;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
-use Zend\Stratigility\MiddlewareInterface;
+use Zend\Diactoros\Response as DiactResp;
 
 class QrCodeCacheMiddleware implements MiddlewareInterface
 {
@@ -26,44 +28,29 @@ class QrCodeCacheMiddleware implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         $cacheKey = $request->getUri()->getPath();
 
         // If this QR code is already cached, just return it
         if ($this->cache->contains($cacheKey)) {
             $qrData = $this->cache->fetch($cacheKey);
+            $response = new DiactResp();
             $response->getBody()->write($qrData['body']);
             return $response->withHeader('Content-Type', $qrData['content-type']);
         }
 
         // If not, call the next middleware and cache it
         /** @var Response $resp */
-        $resp = $out($request, $response);
+        $resp = $delegate->process($request);
         $this->cache->save($cacheKey, [
             'body' => $resp->getBody()->__toString(),
             'content-type' => $resp->getHeaderLine('Content-Type'),

module/Core/test/Action/PreviewActionTest.php

@@ -1,14 +1,15 @@
 <?php
 namespace ShlinkioTest\Shlink\Core\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
-use Shlinkio\Shlink\Common\Exception\PreviewGenerationException;
 use Shlinkio\Shlink\Common\Service\PreviewGenerator;
 use Shlinkio\Shlink\Core\Action\PreviewAction;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 
 class PreviewActionTest extends TestCase
@@ -36,20 +37,17 @@ class PreviewActionTest extends TestCase
     /**
      * @test
      */
-    public function invalidShortCodeFallbacksToNextMiddlewareWithStatusNotFound()
+    public function invalidShortCodeFallsBackToNextMiddleware()
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willReturn(null)->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
+        $delegate->process(Argument::cetera())->shouldBeCalledTimes(1);
 
-        $resp = $this->action->__invoke(
+        $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
-
-        $this->assertEquals(404, $resp->getStatusCode());
     }
 
     /**
@@ -63,9 +61,9 @@ class PreviewActionTest extends TestCase
         $this->urlShortener->shortCodeToUrl($shortCode)->willReturn($url)->shouldBeCalledTimes(1);
         $this->previewGenerator->generatePreview($url)->willReturn($path)->shouldBeCalledTimes(1);
 
-        $resp = $this->action->__invoke(
+        $resp = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
 
         $this->assertEquals(filesize($path), $resp->getHeaderLine('Content-length'));
@@ -75,40 +73,18 @@ class PreviewActionTest extends TestCase
     /**
      * @test
      */
-    public function invalidShortcodeExceptionReturnsNotFound()
+    public function invalidShortCodeExceptionFallsBackToNextMiddleware()
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willThrow(InvalidShortCodeException::class)
                                                        ->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
-        $resp = $this->action->__invoke(
+        $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
 
-        $this->assertEquals(404, $resp->getStatusCode());
+        $delegate->process(Argument::any())->shouldHaveBeenCalledTimes(1);
-    }
-
-    /**
-     * @test
-     */
-    public function previewExceptionReturnsNotFound()
-    {
-        $shortCode = 'abc123';
-        $this->urlShortener->shortCodeToUrl($shortCode)->willThrow(PreviewGenerationException::class)
-                                                       ->shouldBeCalledTimes(1);
-
-        $resp = $this->action->__invoke(
-            ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
-            function ($req, $resp) {
-                return $resp;
-            }
-        );
-
-        $this->assertEquals(500, $resp->getStatusCode());
     }
 }

module/Core/test/Action/QrCodeActionTest.php

@@ -1,7 +1,8 @@
 <?php
 namespace ShlinkioTest\Shlink\Core\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Response\QrCodeResponse;
@@ -9,7 +10,6 @@ use Shlinkio\Shlink\Core\Action\QrCodeAction;
 use Shlinkio\Shlink\Core\Entity\ShortUrl;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
-use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\Expressive\Router\RouterInterface;
 
@@ -37,19 +37,18 @@ class QrCodeActionTest extends TestCase
     /**
      * @test
      */
-    public function aNonexistentShortCodeWillReturnNotFoundResponse()
+    public function aNotFoundShortCodeWillDelegateIntoNextMiddleware()
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willReturn(null)->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
-        $resp = $this->action->__invoke(
+        $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
-        $this->assertEquals(404, $resp->getStatusCode());
+
+        $delegate->process(Argument::any())->shouldHaveBeenCalledTimes(1);
     }
 
     /**
@@ -60,15 +59,14 @@ class QrCodeActionTest extends TestCase
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willThrow(InvalidShortCodeException::class)
                                                        ->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
-        $resp = $this->action->__invoke(
+        $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
-        $this->assertEquals(404, $resp->getStatusCode());
+
+        $delegate->process(Argument::any())->shouldHaveBeenCalledTimes(1);
     }
 
     /**
@@ -78,16 +76,15 @@ class QrCodeActionTest extends TestCase
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willReturn(new ShortUrl())->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
-        $resp = $this->action->__invoke(
+        $resp = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
 
         $this->assertInstanceOf(QrCodeResponse::class, $resp);
         $this->assertEquals(200, $resp->getStatusCode());
+        $delegate->process(Argument::any())->shouldHaveBeenCalledTimes(0);
     }
 }

module/Core/test/Action/RedirectActionTest.php

@@ -1,14 +1,14 @@
 <?php
 namespace ShlinkioTest\Shlink\Core\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
 use Shlinkio\Shlink\Core\Action\RedirectAction;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Shlinkio\Shlink\Core\Service\VisitsTracker;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
 
@@ -42,7 +42,7 @@ class RedirectActionTest extends TestCase
                                                        ->shouldBeCalledTimes(1);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
 
         $this->assertInstanceOf(Response\RedirectResponse::class, $response);
         $this->assertEquals(302, $response->getStatusCode());
@@ -53,52 +53,32 @@ class RedirectActionTest extends TestCase
     /**
      * @test
      */
-    public function nextErrorMiddlewareIsInvokedIfLongUrlIsNotFound()
+    public function nextMiddlewareIsInvokedIfLongUrlIsNotFound()
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willReturn(null)
                            ->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $originalResponse = new Response();
+        $this->action->process($request, $delegate->reveal());
-        $test = $this;
+
-        $this->action->__invoke($request, $originalResponse, function (
+        $delegate->process($request)->shouldHaveBeenCalledTimes(1);
-            ServerRequestInterface $req,
-            ResponseInterface $resp,
-            $error
-        ) use (
-            $test,
-            $request
-        ) {
-            $test->assertSame($request, $req);
-            $test->assertEquals(404, $resp->getStatusCode());
-            $test->assertEquals('Not Found', $error);
-        });
     }
 
     /**
      * @test
      */
-    public function nextErrorMiddlewareIsInvokedIfAnExceptionIsThrown()
+    public function nextMiddlewareIsInvokedIfAnExceptionIsThrown()
     {
         $shortCode = 'abc123';
         $this->urlShortener->shortCodeToUrl($shortCode)->willThrow(\Exception::class)
                                                        ->shouldBeCalledTimes(1);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $originalResponse = new Response();
+        $this->action->process($request, $delegate->reveal());
-        $test = $this;
+
-        $this->action->__invoke($request, $originalResponse, function (
+        $delegate->process($request)->shouldHaveBeenCalledTimes(1);
-            ServerRequestInterface $req,
-            ResponseInterface $resp,
-            $error
-        ) use (
-            $test,
-            $request
-        ) {
-            $test->assertSame($request, $req);
-            $test->assertEquals(404, $resp->getStatusCode());
-            $test->assertEquals('Not Found', $error);
-        });
     }
 }

module/Core/test/ConfigProviderTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Core;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Core\ConfigProvider;
 
 class ConfigProviderTest extends TestCase

module/Core/test/Entity/TagTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Core\Entity;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Core\Entity\Tag;
 
 class TagTest extends TestCase

module/Core/test/Middleware/QrCodeCacheMiddlewareTest.php

@@ -3,7 +3,9 @@ namespace ShlinkioTest\Shlink\Core\Middleware;
 
 use Doctrine\Common\Cache\ArrayCache;
 use Doctrine\Common\Cache\Cache;
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Argument;
 use Shlinkio\Shlink\Core\Middleware\QrCodeCacheMiddleware;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
@@ -29,18 +31,16 @@ class QrCodeCacheMiddlewareTest extends TestCase
     /**
      * @test
      */
-    public function noCachedPathFallbacksToNextMiddleware()
+    public function noCachedPathFallsBackToNextMiddleware()
     {
-        $isCalled = false;
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $this->middleware->__invoke(
+        $delegate->process(Argument::any())->willReturn(new Response())->shouldBeCalledTimes(1);
-            ServerRequestFactory::fromGlobals(),
+
-            new Response(),
+        $this->middleware->process(ServerRequestFactory::fromGlobals()->withUri(
-            function ($req, $resp) use (&$isCalled) {
+            new Uri('/foo/bar')
-                $isCalled = true;
+        ), $delegate->reveal());
-                return $resp;
+
-            }
+        $this->assertTrue($this->cache->contains('/foo/bar'));
-        );
-        $this->assertTrue($isCalled);
     }
 
     /**
@@ -51,19 +51,17 @@ class QrCodeCacheMiddlewareTest extends TestCase
         $isCalled = false;
         $uri = (new Uri())->withPath('/foo');
         $this->cache->save('/foo', ['body' => 'the body', 'content-type' => 'image/png']);
+        $delegate = $this->prophesize(DelegateInterface::class);
 
-        $resp = $this->middleware->__invoke(
+        $resp = $this->middleware->process(
             ServerRequestFactory::fromGlobals()->withUri($uri),
-            new Response(),
+            $delegate->reveal()
-            function ($req, $resp) use (&$isCalled) {
-                $isCalled = true;
-                return $resp;
-            }
         );
 
         $this->assertFalse($isCalled);
         $resp->getBody()->rewind();
         $this->assertEquals('the body', $resp->getBody()->getContents());
         $this->assertEquals('image/png', $resp->getHeaderLine('Content-Type'));
+        $delegate->process(Argument::any())->shouldHaveBeenCalledTimes(0);
     }
 }

module/Core/test/Options/AppOptionsFactoryTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Core\Options;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Core\Options\AppOptions;
 use Shlinkio\Shlink\Core\Options\AppOptionsFactory;
 use Zend\ServiceManager\ServiceManager;

module/Core/test/Service/ShortUrlServiceTest.php

@@ -3,7 +3,7 @@ namespace ShlinkioTest\Shlink\Core\Service;
 
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityRepository;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Entity\ShortUrl;

module/Core/test/Service/UrlShortenerTest.php

@@ -10,7 +10,7 @@ use Doctrine\ORM\ORMException;
 use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Psr7\Request;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Entity\ShortUrl;

module/Core/test/Service/VisitServiceTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Core\Service;
 
 use Doctrine\ORM\EntityManager;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Entity\Visit;
 use Shlinkio\Shlink\Core\Repository\VisitRepository;

module/Core/test/Service/VisitsTrackerTest.php

@@ -3,7 +3,7 @@ namespace ShlinkioTest\Shlink\Core\Service;
 
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityRepository;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Entity\ShortUrl;

module/Rest/config/error-handler.config.php

@@ -1,12 +1,12 @@
 <?php
-use Shlinkio\Shlink\Rest\ErrorHandler\JsonErrorHandler;
+use Shlinkio\Shlink\Rest\ErrorHandler\JsonErrorResponseGenerator;
 
 return [
 
     'error_handler' => [
         'plugins' => [
             'invokables' => [
-                'application/json' => JsonErrorHandler::class,
+                'application/json' => JsonErrorResponseGenerator::class,
             ],
             'aliases' => [
                 'application/x-json' => 'application/json',

module/Rest/config/middleware-pipeline.config.php

@@ -1,25 +0,0 @@
-<?php
-use Shlinkio\Shlink\Rest\Middleware;
-
-return [
-
-    'middleware_pipeline' => [
-        'pre-routing' => [
-            'path' => '/rest',
-            'middleware' => [
-                Middleware\PathVersionMiddleware::class,
-            ],
-            'priority' => 11,
-        ],
-
-        'rest' => [
-            'path' => '/rest',
-            'middleware' => [
-                Middleware\CrossDomainMiddleware::class,
-                Middleware\BodyParserMiddleware::class,
-                Middleware\CheckAuthenticationMiddleware::class,
-            ],
-            'priority' => 5,
-        ],
-    ],
-];

module/Rest/src/Action/AbstractRestAction.php

@@ -1,13 +1,17 @@
 <?php
 namespace Shlinkio\Shlink\Rest\Action;
 
+use Fig\Http\Message\RequestMethodInterface;
+use Fig\Http\Message\StatusCodeInterface;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
-use Zend\Stratigility\MiddlewareInterface;
+use Zend\Diactoros\Response\EmptyResponse;
 
-abstract class AbstractRestAction implements MiddlewareInterface
+abstract class AbstractRestAction implements MiddlewareInterface, RequestMethodInterface, StatusCodeInterface
 {
     /**
      * @var LoggerInterface
@@ -20,44 +24,27 @@ abstract class AbstractRestAction implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
-        if ($request->getMethod() === 'OPTIONS') {
+        if ($request->getMethod() === self::METHOD_OPTIONS) {
-            return $response;
+            return new EmptyResponse();
         }
 
-        return $this->dispatch($request, $response, $out);
+        return $this->dispatch($request, $delegate);
     }
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    abstract protected function dispatch(Request $request, Response $response, callable $out = null);
+    abstract protected function dispatch(Request $request, DelegateInterface $delegate);
 }

module/Rest/src/Action/AuthenticateAction.php

@@ -2,9 +2,10 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
-use Firebase\JWT\JWT;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
+use Psr\Log\LoggerInterface;
 use Shlinkio\Shlink\Rest\Authentication\JWTService;
 use Shlinkio\Shlink\Rest\Authentication\JWTServiceInterface;
 use Shlinkio\Shlink\Rest\Service\ApiKeyService;
@@ -33,14 +34,17 @@ class AuthenticateAction extends AbstractRestAction
      * @param ApiKeyServiceInterface|ApiKeyService $apiKeyService
      * @param JWTServiceInterface|JWTService $jwtService
      * @param TranslatorInterface $translator
+     * @param LoggerInterface|null $logger
      *
-     * @Inject({ApiKeyService::class, JWTService::class, "translator"})
+     * @Inject({ApiKeyService::class, JWTService::class, "translator", "Logger_Shlink"})
      */
     public function __construct(
         ApiKeyServiceInterface $apiKeyService,
         JWTServiceInterface $jwtService,
-        TranslatorInterface $translator
+        TranslatorInterface $translator,
+        LoggerInterface $logger = null
     ) {
+        parent::__construct($logger);
         $this->translator = $translator;
         $this->apiKeyService = $apiKeyService;
         $this->jwtService = $jwtService;
@@ -48,11 +52,10 @@ class AuthenticateAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    public function dispatch(Request $request, Response $response, callable $out = null)
+    public function dispatch(Request $request, DelegateInterface $delegate)
     {
         $authData = $request->getParsedBody();
         if (! isset($authData['apiKey'])) {
@@ -61,7 +64,7 @@ class AuthenticateAction extends AbstractRestAction
                 'message' => $this->translator->translate(
                     'You have to provide a valid API key under the "apiKey" param name.'
                 ),
-            ], 400);
+            ], self::STATUS_BAD_REQUEST);
         }
 
         // Authenticate using provided API key
@@ -70,7 +73,7 @@ class AuthenticateAction extends AbstractRestAction
             return new JsonResponse([
                 'error' => RestUtils::INVALID_API_KEY_ERROR,
                 'message' => $this->translator->translate('Provided API key does not exist or is invalid.'),
-            ], 401);
+            ], self::STATUS_UNAUTHORIZED);
         }
 
         // Generate a JSON Web Token that will be used for authorization in next requests

module/Rest/src/Action/CreateShortcodeAction.php

@@ -2,6 +2,7 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -52,18 +53,17 @@ class CreateShortcodeAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    public function dispatch(Request $request, Response $response, callable $out = null)
+    public function dispatch(Request $request, DelegateInterface $delegate)
     {
         $postData = $request->getParsedBody();
         if (! isset($postData['longUrl'])) {
             return new JsonResponse([
                 'error' => RestUtils::INVALID_ARGUMENT_ERROR,
                 'message' => $this->translator->translate('A URL was not provided'),
-            ], 400);
+            ], self::STATUS_BAD_REQUEST);
         }
         $longUrl = $postData['longUrl'];
         $tags = isset($postData['tags']) && is_array($postData['tags']) ? $postData['tags'] : [];
@@ -87,13 +87,13 @@ class CreateShortcodeAction extends AbstractRestAction
                     $this->translator->translate('Provided URL %s is invalid. Try with a different one.'),
                     $longUrl
                 ),
-            ], 400);
+            ], self::STATUS_BAD_REQUEST);
         } catch (\Exception $e) {
             $this->logger->error('Unexpected error creating shortcode.' . PHP_EOL . $e);
             return new JsonResponse([
                 'error' => RestUtils::UNKNOWN_ERROR,
                 'message' => $this->translator->translate('Unexpected error occurred'),
-            ], 500);
+            ], self::STATUS_INTERNAL_SERVER_ERROR);
         }
     }
 }

module/Rest/src/Action/EditTagsAction.php

@@ -2,6 +2,7 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -43,11 +44,10 @@ class EditTagsAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    protected function dispatch(Request $request, Response $response, callable $out = null)
+    protected function dispatch(Request $request, DelegateInterface $delegate)
     {
         $shortCode = $request->getAttribute('shortCode');
         $bodyParams = $request->getParsedBody();
@@ -56,7 +56,7 @@ class EditTagsAction extends AbstractRestAction
             return new JsonResponse([
                 'error' => RestUtils::INVALID_ARGUMENT_ERROR,
                 'message' => $this->translator->translate('A list of tags was not provided'),
-            ], 400);
+            ], self::STATUS_BAD_REQUEST);
         }
         $tags = $bodyParams['tags'];
 
@@ -67,7 +67,7 @@ class EditTagsAction extends AbstractRestAction
             return new JsonResponse([
                 'error' => RestUtils::getRestErrorCodeFromException($e),
                 'message' => sprintf($this->translator->translate('No URL found for short code "%s"'), $shortCode),
-            ], 404);
+            ], self::STATUS_NOT_FOUND);
         }
     }
 }

module/Rest/src/Action/GetVisitsAction.php

@@ -2,6 +2,7 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -44,11 +45,10 @@ class GetVisitsAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    public function dispatch(Request $request, Response $response, callable $out = null)
+    public function dispatch(Request $request, DelegateInterface $delegate)
     {
         $shortCode = $request->getAttribute('shortCode');
         $startDate = $this->getDateQueryParam($request, 'startDate');
@@ -70,13 +70,13 @@ class GetVisitsAction extends AbstractRestAction
                     $this->translator->translate('Provided short code %s does not exist'),
                     $shortCode
                 ),
-            ], 404);
+            ], self::STATUS_NOT_FOUND);
         } catch (\Exception $e) {
             $this->logger->error('Unexpected error while parsing short code'. PHP_EOL . $e);
             return new JsonResponse([
                 'error' => RestUtils::UNKNOWN_ERROR,
                 'message' => $this->translator->translate('Unexpected error occurred'),
-            ], 500);
+            ], self::STATUS_INTERNAL_SERVER_ERROR);
         }
     }
 

module/Rest/src/Action/ListShortcodesAction.php

@@ -2,6 +2,7 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -46,11 +47,10 @@ class ListShortcodesAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    public function dispatch(Request $request, Response $response, callable $out = null)
+    public function dispatch(Request $request, DelegateInterface $delegate)
     {
         try {
             $params = $this->queryToListParams($request->getQueryParams());
@@ -61,7 +61,7 @@ class ListShortcodesAction extends AbstractRestAction
             return new JsonResponse([
                 'error' => RestUtils::UNKNOWN_ERROR,
                 'message' => $this->translator->translate('Unexpected error occurred'),
-            ], 500);
+            ], self::STATUS_INTERNAL_SERVER_ERROR);
         }
     }
 

module/Rest/src/Action/ResolveUrlAction.php

@@ -2,6 +2,7 @@
 namespace Shlinkio\Shlink\Rest\Action;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Interop\Http\ServerMiddleware\DelegateInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -43,11 +44,10 @@ class ResolveUrlAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param callable|null $out
      * @return null|Response
      */
-    public function dispatch(Request $request, Response $response, callable $out = null)
+    public function dispatch(Request $request, DelegateInterface $delegate)
     {
         $shortCode = $request->getAttribute('shortCode');
 
@@ -57,7 +57,7 @@ class ResolveUrlAction extends AbstractRestAction
                 return new JsonResponse([
                     'error' => RestUtils::INVALID_ARGUMENT_ERROR,
                     'message' => sprintf($this->translator->translate('No URL found for short code "%s"'), $shortCode),
-                ], 404);
+                ], self::STATUS_NOT_FOUND);
             }
 
             return new JsonResponse([
@@ -71,13 +71,13 @@ class ResolveUrlAction extends AbstractRestAction
                     $this->translator->translate('Provided short code "%s" has an invalid format'),
                     $shortCode
                 ),
-            ], 400);
+            ], self::STATUS_BAD_REQUEST);
         } catch (\Exception $e) {
             $this->logger->error('Unexpected error while resolving the URL behind a short code.' . PHP_EOL . $e);
             return new JsonResponse([
                 'error' => RestUtils::UNKNOWN_ERROR,
                 'message' => $this->translator->translate('Unexpected error occurred'),
-            ], 500);
+            ], self::STATUS_INTERNAL_SERVER_ERROR);
         }
     }
 }

module/Rest/src/ErrorHandler/JsonErrorResponseGenerator.php

@@ -1,34 +1,28 @@
 <?php
 namespace Shlinkio\Shlink\Rest\ErrorHandler;
 
-use Acelaya\ExpressiveErrorHandler\ErrorHandler\ErrorHandlerInterface;
+use Acelaya\ExpressiveErrorHandler\ErrorHandler\ErrorResponseGeneratorInterface;
+use Fig\Http\Message\StatusCodeInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Zend\Diactoros\Response\JsonResponse;
 use Zend\Expressive\Router\RouteResult;
 
-class JsonErrorHandler implements ErrorHandlerInterface
+class JsonErrorResponseGenerator implements ErrorResponseGeneratorInterface, StatusCodeInterface
 {
     /**
      * Final handler for an application.
      *
+     * @param \Throwable|\Exception $e
      * @param Request $request
      * @param Response $response
-     * @param null|mixed $err
      * @return Response
      */
-    public function __invoke(Request $request, Response $response, $err = null)
+    public function __invoke($e, Request $request, Response $response)
     {
-        $hasRoute = $request->getAttribute(RouteResult::class) !== null;
-        $isNotFound = ! $hasRoute && ! isset($err);
-        if ($isNotFound) {
-            $responsePhrase = 'Not found';
-            $status = 404;
-        } else {
         $status = $response->getStatusCode();
         $responsePhrase = $status < 400 ? 'Internal Server Error' : $response->getReasonPhrase();
-            $status = $status < 400 ? 500 : $status;
+        $status = $status < 400 ? self::STATUS_INTERNAL_SERVER_ERROR : $status;
-        }
 
         return new JsonResponse([
             'error' => $this->responsePhraseToCode($responsePhrase),

module/Rest/src/Middleware/BodyParserMiddleware.php

@@ -1,55 +1,45 @@
 <?php
 namespace Shlinkio\Shlink\Rest\Middleware;
 
+use Fig\Http\Message\RequestMethodInterface;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Shlinkio\Shlink\Common\Exception\RuntimeException;
-use Zend\Stratigility\MiddlewareInterface;
 
-class BodyParserMiddleware implements MiddlewareInterface
+class BodyParserMiddleware implements MiddlewareInterface, RequestMethodInterface
 {
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         $method = $request->getMethod();
         $currentParams = $request->getParsedBody();
 
         // In requests that do not allow body or if the body has already been parsed, continue to next middleware
-        if (in_array($method, ['GET', 'HEAD', 'OPTIONS']) || ! empty($currentParams)) {
+        if (! empty($currentParams) || in_array($method, [
-            return $out($request, $response);
+            self::METHOD_GET,
+            self::METHOD_HEAD,
+            self::METHOD_OPTIONS
+        ], true)) {
+            return $delegate->process($request);
         }
 
         // If the accepted content is JSON, try to parse the body from JSON
         $contentType = $this->getRequestContentType($request);
-        if (in_array($contentType, ['application/json', 'text/json', 'application/x-json'])) {
+        if (in_array($contentType, ['application/json', 'text/json', 'application/x-json'], true)) {
-            return $out($this->parseFromJson($request), $response);
+            return $delegate->process($this->parseFromJson($request));
         }
 
-        return $out($this->parseFromUrlEncoded($request), $response);
+        return $delegate->process($this->parseFromUrlEncoded($request));
     }
 
     /**

module/Rest/src/Middleware/CheckAuthenticationMiddleware.php

@@ -2,6 +2,9 @@
 namespace Shlinkio\Shlink\Rest\Middleware;
 
 use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Fig\Http\Message\StatusCodeInterface;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Log\LoggerInterface;
@@ -14,9 +17,8 @@ use Zend\Diactoros\Response\JsonResponse;
 use Zend\Expressive\Router\RouteResult;
 use Zend\I18n\Translator\TranslatorInterface;
 use Zend\Stdlib\ErrorHandler;
-use Zend\Stratigility\MiddlewareInterface;
 
-class CheckAuthenticationMiddleware implements MiddlewareInterface
+class CheckAuthenticationMiddleware implements MiddlewareInterface, StatusCodeInterface
 {
     const AUTHORIZATION_HEADER = 'Authorization';
 
@@ -52,31 +54,15 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
     }
 
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         // If current route is the authenticate route or an OPTIONS request, continue to the next middleware
         /** @var RouteResult $routeResult */
@@ -86,7 +72,7 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
             || $routeResult->getMatchedRouteName() === 'rest-authenticate'
             || $request->getMethod() === 'OPTIONS'
         ) {
-            return $out($request, $response);
+            return $delegate->process($request);
         }
 
         // Check that the auth header was provided, and that it belongs to a non-expired token
@@ -103,7 +89,7 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
                 'message' => sprintf($this->translator->translate(
                     'You need to provide the Bearer type in the %s header.'
                 ), self::AUTHORIZATION_HEADER),
-            ], 401);
+            ], self::STATUS_UNAUTHORIZED);
         }
 
         // Make sure the authorization type is Bearer
@@ -114,7 +100,7 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
                 'message' => sprintf($this->translator->translate(
                     'Provided authorization type %s is not supported. Use Bearer instead.'
                 ), $authType),
-            ], 401);
+            ], self::STATUS_UNAUTHORIZED);
         }
 
         try {
@@ -126,20 +112,13 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
 
             // Update the token expiration and continue to next middleware
             $jwt = $this->jwtService->refresh($jwt);
-            /** @var Response $response */
+            $response = $delegate->process($request);
-            $response = $out($request, $response);
 
             // Return the response with the updated token on it
             return $response->withHeader(self::AUTHORIZATION_HEADER, 'Bearer ' . $jwt);
         } catch (AuthenticationException $e) {
             $this->logger->warning('Tried to access API with an invalid JWT.' . PHP_EOL . $e);
             return $this->createTokenErrorResponse();
-        } catch (\Exception $e) {
-            $this->logger->warning('Unexpected error occurred.' . PHP_EOL . $e);
-            return $this->createTokenErrorResponse();
-        } catch (\Throwable $e) {
-            $this->logger->warning('Unexpected error occurred.' . PHP_EOL . $e);
-            return $this->createTokenErrorResponse();
         } finally {
             ErrorHandler::clean();
         }
@@ -156,6 +135,6 @@ class CheckAuthenticationMiddleware implements MiddlewareInterface
                 ),
                 self::AUTHORIZATION_HEADER
             ),
-        ], 401);
+        ], self::STATUS_UNAUTHORIZED);
     }
 }

module/Rest/src/Middleware/CrossDomainMiddleware.php

@@ -1,41 +1,26 @@
 <?php
 namespace Shlinkio\Shlink\Rest\Middleware;
 
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use Interop\Http\ServerMiddleware\MiddlewareInterface;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
-use Zend\Stratigility\MiddlewareInterface;
 
 class CrossDomainMiddleware implements MiddlewareInterface
 {
     /**
-     * Process an incoming request and/or response.
+     * Process an incoming server request and return a response, optionally delegating
-     *
+     * to the next middleware component to create the response.
-     * Accepts a server-side request and a response instance, and does
-     * something with them.
-     *
-     * If the response is not complete and/or further processing would not
-     * interfere with the work done in the middleware, or if the middleware
-     * wants to delegate to another process, it can use the `$out` callable
-     * if present.
-     *
-     * If the middleware does not return a value, execution of the current
-     * request is considered complete, and the response instance provided will
-     * be considered the response to return.
-     *
-     * Alternately, the middleware may return a response instance.
-     *
-     * Often, middleware will `return $out();`, with the assumption that a
-     * later middleware will return a response.
      *
      * @param Request $request
-     * @param Response $response
+     * @param DelegateInterface $delegate
-     * @param null|callable $out
+     *
-     * @return null|Response
+     * @return Response
      */
-    public function __invoke(Request $request, Response $response, callable $out = null)
+    public function process(Request $request, DelegateInterface $delegate)
     {
         /** @var Response $response */
-        $response = $out($request, $response);
+        $response = $delegate->process($request);
         if (! $request->hasHeader('Origin')) {
             return $response;
         }

module/Rest/test/Action/AuthenticateActionTest.php

@@ -1,13 +1,13 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Rest\Action\AuthenticateAction;
 use Shlinkio\Shlink\Rest\Authentication\JWTService;
 use Shlinkio\Shlink\Rest\Entity\ApiKey;
 use Shlinkio\Shlink\Rest\Service\ApiKeyService;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 
@@ -42,7 +42,7 @@ class AuthenticateActionTest extends TestCase
      */
     public function notProvidingAuthDataReturnsError()
     {
-        $resp = $this->action->__invoke(ServerRequestFactory::fromGlobals(), new Response());
+        $resp = $this->action->process(ServerRequestFactory::fromGlobals(), TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(400, $resp->getStatusCode());
     }
 
@@ -57,7 +57,7 @@ class AuthenticateActionTest extends TestCase
         $request = ServerRequestFactory::fromGlobals()->withParsedBody([
             'apiKey' => 'foo',
         ]);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(200, $response->getStatusCode());
 
         $response->getBody()->rewind();
@@ -75,7 +75,7 @@ class AuthenticateActionTest extends TestCase
         $request = ServerRequestFactory::fromGlobals()->withParsedBody([
             'apiKey' => 'foo',
         ]);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(401, $response->getStatusCode());
     }
 }

module/Rest/test/Action/CreateShortcodeActionTest.php

@@ -1,14 +1,14 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Exception\InvalidUrlException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Shlinkio\Shlink\Rest\Action\CreateShortcodeAction;
 use Shlinkio\Shlink\Rest\Util\RestUtils;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\Diactoros\Uri;
 use Zend\I18n\Translator\Translator;
@@ -38,7 +38,10 @@ class CreateShortcodeActionTest extends TestCase
      */
     public function missingLongUrlParamReturnsError()
     {
-        $response = $this->action->__invoke(ServerRequestFactory::fromGlobals(), new Response());
+        $response = $this->action->process(
+            ServerRequestFactory::fromGlobals(),
+            TestUtils::createDelegateMock()->reveal()
+        );
         $this->assertEquals(400, $response->getStatusCode());
     }
 
@@ -54,7 +57,7 @@ class CreateShortcodeActionTest extends TestCase
         $request = ServerRequestFactory::fromGlobals()->withParsedBody([
             'longUrl' => 'http://www.domain.com/foo/bar',
         ]);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(200, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), 'http://foo.com/abc123') > 0);
     }
@@ -71,7 +74,7 @@ class CreateShortcodeActionTest extends TestCase
         $request = ServerRequestFactory::fromGlobals()->withParsedBody([
             'longUrl' => 'http://www.domain.com/foo/bar',
         ]);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(400, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), RestUtils::INVALID_URL_ERROR) > 0);
     }
@@ -88,7 +91,7 @@ class CreateShortcodeActionTest extends TestCase
         $request = ServerRequestFactory::fromGlobals()->withParsedBody([
             'longUrl' => 'http://www.domain.com/foo/bar',
         ]);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(500, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), RestUtils::UNKNOWN_ERROR) > 0);
     }

module/Rest/test/Action/EditTagsActionTest.php

@@ -1,13 +1,13 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Entity\ShortUrl;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\ShortUrlService;
 use Shlinkio\Shlink\Rest\Action\EditTagsAction;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 
@@ -33,9 +33,9 @@ class EditTagsActionTest extends TestCase
      */
     public function notProvidingTagsReturnsError()
     {
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', 'abc123'),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(400, $response->getStatusCode());
     }
@@ -49,10 +49,10 @@ class EditTagsActionTest extends TestCase
         $this->shortUrlService->setTagsByShortCode($shortCode, [])->willThrow(InvalidShortCodeException::class)
                                                                   ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', 'abc123')
                                                ->withParsedBody(['tags' => []]),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(404, $response->getStatusCode());
     }
@@ -66,10 +66,10 @@ class EditTagsActionTest extends TestCase
         $this->shortUrlService->setTagsByShortCode($shortCode, [])->willReturn(new ShortUrl())
                                                                   ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', 'abc123')
                 ->withParsedBody(['tags' => []]),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(200, $response->getStatusCode());
     }

module/Rest/test/Action/GetVisitsActionTest.php

@@ -1,14 +1,14 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Common\Exception\InvalidArgumentException;
 use Shlinkio\Shlink\Common\Util\DateRange;
 use Shlinkio\Shlink\Core\Service\VisitsTracker;
 use Shlinkio\Shlink\Rest\Action\GetVisitsAction;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 
@@ -38,9 +38,9 @@ class GetVisitsActionTest extends TestCase
         $this->visitsTracker->info($shortCode, Argument::type(DateRange::class))->willReturn([])
                                                                                 ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(200, $response->getStatusCode());
     }
@@ -55,9 +55,9 @@ class GetVisitsActionTest extends TestCase
             InvalidArgumentException::class
         )->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(404, $response->getStatusCode());
     }
@@ -72,9 +72,9 @@ class GetVisitsActionTest extends TestCase
             \Exception::class
         )->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(500, $response->getStatusCode());
     }
@@ -89,10 +89,10 @@ class GetVisitsActionTest extends TestCase
             ->willReturn([])
             ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode)
                                                ->withQueryParams(['endDate' => '2016-01-01 00:00:00']),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(200, $response->getStatusCode());
     }

module/Rest/test/Action/ListShortcodesActionTest.php

@@ -1,17 +1,17 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Service\ShortUrlService;
 use Shlinkio\Shlink\Rest\Action\ListShortcodesAction;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 use Zend\Paginator\Adapter\ArrayAdapter;
 use Zend\Paginator\Paginator;
 
-class ListShortcodesActionTest extends TestCase
+class ListShortCodesActionTest extends TestCase
 {
     /**
      * @var ListShortcodesAction
@@ -37,11 +37,11 @@ class ListShortcodesActionTest extends TestCase
         $this->service->listShortUrls($page, null, [], null)->willReturn(new Paginator(new ArrayAdapter()))
                                                             ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withQueryParams([
                 'page' => $page,
             ]),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(200, $response->getStatusCode());
     }
@@ -55,11 +55,11 @@ class ListShortcodesActionTest extends TestCase
         $this->service->listShortUrls($page, null, [], null)->willThrow(\Exception::class)
                                                             ->shouldBeCalledTimes(1);
 
-        $response = $this->action->__invoke(
+        $response = $this->action->process(
             ServerRequestFactory::fromGlobals()->withQueryParams([
                 'page' => $page,
             ]),
-            new Response()
+            TestUtils::createDelegateMock()->reveal()
         );
         $this->assertEquals(500, $response->getStatusCode());
     }

module/Rest/test/Action/ResolveUrlActionTest.php

@@ -1,13 +1,13 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Action;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;
 use Shlinkio\Shlink\Core\Service\UrlShortener;
 use Shlinkio\Shlink\Rest\Action\ResolveUrlAction;
 use Shlinkio\Shlink\Rest\Util\RestUtils;
-use Zend\Diactoros\Response;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\ServerRequestFactory;
 use Zend\I18n\Translator\Translator;
 
@@ -38,7 +38,7 @@ class ResolveUrlActionTest extends TestCase
                                                        ->shouldBeCalledTimes(1);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(404, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), RestUtils::INVALID_ARGUMENT_ERROR) > 0);
     }
@@ -53,7 +53,7 @@ class ResolveUrlActionTest extends TestCase
                                                        ->shouldBeCalledTimes(1);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(200, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), 'http://domain.com/foo/bar') > 0);
     }
@@ -68,7 +68,7 @@ class ResolveUrlActionTest extends TestCase
                                                        ->shouldBeCalledTimes(1);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(400, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), RestUtils::INVALID_SHORTCODE_ERROR) > 0);
     }
@@ -83,7 +83,7 @@ class ResolveUrlActionTest extends TestCase
                                                        ->shouldBeCalledTimes(1);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute('shortCode', $shortCode);
-        $response = $this->action->__invoke($request, new Response());
+        $response = $this->action->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(500, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), RestUtils::UNKNOWN_ERROR) > 0);
     }

module/Rest/test/Authentication/JWTServiceTest.php

@@ -2,7 +2,7 @@
 namespace ShlinkioTest\Shlink\Rest\Authentication;
 
 use Firebase\JWT\JWT;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Core\Options\AppOptions;
 use Shlinkio\Shlink\Rest\Authentication\JWTService;
 use Shlinkio\Shlink\Rest\Entity\ApiKey;

module/Rest/test/ConfigProviderTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Rest\ConfigProvider;
 
 class ConfigProviderTest extends TestCase
@@ -24,7 +24,6 @@ class ConfigProviderTest extends TestCase
         $config = $this->configProvider->__invoke();
 
         $this->assertArrayHasKey('error_handler', $config);
-        $this->assertArrayHasKey('middleware_pipeline', $config);
         $this->assertArrayHasKey('routes', $config);
         $this->assertArrayHasKey('dependencies', $config);
         $this->assertArrayHasKey('translator', $config);

module/Rest/test/ErrorHandler/JsonErrorHandlerTest.php

@@ -1,79 +0,0 @@
-<?php
-namespace ShlinkioTest\Shlink\Rest\ErrorHandler;
-
-use PHPUnit_Framework_TestCase as TestCase;
-use Shlinkio\Shlink\Rest\ErrorHandler\JsonErrorHandler;
-use Zend\Diactoros\Response;
-use Zend\Diactoros\ServerRequestFactory;
-use Zend\Expressive\Router\RouteResult;
-
-class JsonErrorHandlerTest extends TestCase
-{
-    /**
-     * @var JsonErrorHandler
-     */
-    protected $errorHandler;
-
-    public function setUp()
-    {
-        $this->errorHandler = new JsonErrorHandler();
-    }
-
-    /**
-     * @test
-     */
-    public function noMatchedRouteReturnsNotFoundResponse()
-    {
-        $response = $this->errorHandler->__invoke(ServerRequestFactory::fromGlobals(), new Response());
-        $this->assertInstanceOf(Response\JsonResponse::class, $response);
-        $this->assertEquals(404, $response->getStatusCode());
-    }
-
-    /**
-     * @test
-     */
-    public function matchedRouteWithErrorReturnsMethodNotAllowedResponse()
-    {
-        $response = $this->errorHandler->__invoke(
-            ServerRequestFactory::fromGlobals(),
-            (new Response())->withStatus(405),
-            405
-        );
-        $this->assertInstanceOf(Response\JsonResponse::class, $response);
-        $this->assertEquals(405, $response->getStatusCode());
-    }
-
-    /**
-     * @test
-     */
-    public function responseWithErrorKeepsStatus()
-    {
-        $response = $this->errorHandler->__invoke(
-            ServerRequestFactory::fromGlobals()->withAttribute(
-                RouteResult::class,
-                RouteResult::fromRouteMatch('foo', 'bar', [])
-            ),
-            (new Response())->withStatus(401),
-            401
-        );
-        $this->assertInstanceOf(Response\JsonResponse::class, $response);
-        $this->assertEquals(401, $response->getStatusCode());
-    }
-
-    /**
-     * @test
-     */
-    public function responseWithoutErrorReturnsStatus500()
-    {
-        $response = $this->errorHandler->__invoke(
-            ServerRequestFactory::fromGlobals()->withAttribute(
-                RouteResult::class,
-                RouteResult::fromRouteMatch('foo', 'bar', [])
-            ),
-            (new Response())->withStatus(200),
-            'Some error'
-        );
-        $this->assertInstanceOf(Response\JsonResponse::class, $response);
-        $this->assertEquals(500, $response->getStatusCode());
-    }
-}

module/Rest/test/ErrorHandler/JsonErrorResponseGeneratorTest.php

@@ -0,0 +1,44 @@
+<?php
+namespace ShlinkioTest\Shlink\Rest\ErrorHandler;
+
+use PHPUnit\Framework\TestCase;
+use Shlinkio\Shlink\Rest\ErrorHandler\JsonErrorResponseGenerator;
+use Zend\Diactoros\Response;
+use Zend\Diactoros\ServerRequestFactory;
+
+class JsonErrorResponseGeneratorTest extends TestCase
+{
+    /**
+     * @var JsonErrorResponseGenerator
+     */
+    protected $errorHandler;
+
+    public function setUp()
+    {
+        $this->errorHandler = new JsonErrorResponseGenerator();
+    }
+
+    /**
+     * @test
+     */
+    public function noErrorStatusReturnsInternalServerError()
+    {
+        $response = $this->errorHandler->__invoke(null, ServerRequestFactory::fromGlobals(), new Response());
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(500, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function errorStatusReturnsThatStatus()
+    {
+        $response = $this->errorHandler->__invoke(
+            null,
+            ServerRequestFactory::fromGlobals(),
+            (new Response())->withStatus(405)
+        );
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(405, $response->getStatusCode());
+    }
+}

module/Rest/test/Middleware/BodyParserMiddlewareTest.php

@@ -1,8 +1,11 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Middleware;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
-use Psr\Http\Message\ServerRequestInterface as Request;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Argument;
+use Prophecy\Prophecy\MethodProphecy;
+use Psr\Http\Message\ServerRequestInterface;
 use Shlinkio\Shlink\Rest\Middleware\BodyParserMiddleware;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
@@ -26,16 +29,13 @@ class BodyParserMiddlewareTest extends TestCase
     public function requestsFromOtherMethodsJustFallbackToNextMiddleware()
     {
         $request = ServerRequestFactory::fromGlobals()->withMethod('GET');
-        $test = $this;
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) use ($test, $request) {
+        /** @var MethodProphecy $process */
-            $test->assertSame($request, $req);
+        $process = $delegate->process($request)->willReturn(new Response());
-        });
 
-        $request = $request->withMethod('POST');
+        $this->middleware->process($request, $delegate->reveal());
-        $test = $this;
+
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) use ($test, $request) {
+        $process->shouldHaveBeenCalledTimes(1);
-            $test->assertSame($request, $req);
-        });
     }
 
     /**
@@ -43,19 +43,31 @@ class BodyParserMiddlewareTest extends TestCase
      */
     public function jsonRequestsAreJsonDecoded()
     {
+        $test = $this;
         $body = new Stream('php://temp', 'wr');
         $body->write('{"foo": "bar", "bar": ["one", 5]}');
         $request = ServerRequestFactory::fromGlobals()->withMethod('PUT')
                                                       ->withBody($body)
                                                       ->withHeader('content-type', 'application/json');
-        $test = $this;
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $this->middleware->__invoke($request, new Response(), function (Request $req, $resp) use ($test, $request) {
+        /** @var MethodProphecy $process */
-            $test->assertNotSame($request, $req);
+        $process = $delegate->process(Argument::type(ServerRequestInterface::class))->will(
+            function (array $args) use ($test) {
+                /** @var ServerRequestInterface $req */
+                $req = array_shift($args);
+
                 $test->assertEquals([
                     'foo' => 'bar',
                     'bar' => ['one', 5],
                 ], $req->getParsedBody());
-        });
+
+                return new Response();
+            }
+        );
+
+        $this->middleware->process($request, $delegate->reveal());
+
+        $process->shouldHaveBeenCalledTimes(1);
     }
 
     /**
@@ -63,17 +75,29 @@ class BodyParserMiddlewareTest extends TestCase
      */
     public function regularRequestsAreUrlDecoded()
     {
+        $test = $this;
         $body = new Stream('php://temp', 'wr');
         $body->write('foo=bar&bar[]=one&bar[]=5');
         $request = ServerRequestFactory::fromGlobals()->withMethod('PUT')
                                                       ->withBody($body);
-        $test = $this;
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $this->middleware->__invoke($request, new Response(), function (Request $req, $resp) use ($test, $request) {
+        /** @var MethodProphecy $process */
-            $test->assertNotSame($request, $req);
+        $process = $delegate->process(Argument::type(ServerRequestInterface::class))->will(
+            function (array $args) use ($test) {
+                /** @var ServerRequestInterface $req */
+                $req = array_shift($args);
+
                 $test->assertEquals([
                     'foo' => 'bar',
                     'bar' => ['one', 5],
                 ], $req->getParsedBody());
-        });
+
+                return new Response();
+            }
+        );
+
+        $this->middleware->process($request, $delegate->reveal());
+
+        $process->shouldHaveBeenCalledTimes(1);
     }
 }

module/Rest/test/Middleware/CheckAuthenticationMiddlewareTest.php

@@ -1,12 +1,16 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Middleware;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Prophecy\MethodProphecy;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Rest\Authentication\JWTService;
 use Shlinkio\Shlink\Rest\Middleware\CheckAuthenticationMiddleware;
+use ShlinkioTest\Shlink\Common\Util\TestUtils;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
+use Zend\Expressive\Router\Route;
 use Zend\Expressive\Router\RouteResult;
 use Zend\I18n\Translator\Translator;
 
@@ -33,49 +37,42 @@ class CheckAuthenticationMiddlewareTest extends TestCase
     public function someWhiteListedSituationsFallbackToNextMiddleware()
     {
         $request = ServerRequestFactory::fromGlobals();
-        $response = new Response();
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $isCalled = false;
+        /** @var MethodProphecy $process */
-        $this->assertFalse($isCalled);
+        $process = $delegate->process($request)->willReturn(new Response());
-        $this->middleware->__invoke($request, $response, function ($req, $resp) use (&$isCalled) {
+
-            $isCalled = true;
+        $this->middleware->process($request, $delegate->reveal());
-        });
+        $process->shouldHaveBeenCalledTimes(1);
-        $this->assertTrue($isCalled);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
             RouteResult::fromRouteFailure(['GET'])
         );
-        $response = new Response();
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $isCalled = false;
+        /** @var MethodProphecy $process */
-        $this->assertFalse($isCalled);
+        $process = $delegate->process($request)->willReturn(new Response());
-        $this->middleware->__invoke($request, $response, function ($req, $resp) use (&$isCalled) {
+        $this->middleware->process($request, $delegate->reveal());
-            $isCalled = true;
+        $process->shouldHaveBeenCalledTimes(1);
-        });
-        $this->assertTrue($isCalled);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('rest-authenticate', 'foo', [])
+            RouteResult::fromRoute(new Route('foo', '', Route::HTTP_METHOD_ANY, 'rest-authenticate'), [])
         );
-        $response = new Response();
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $isCalled = false;
+        /** @var MethodProphecy $process */
-        $this->assertFalse($isCalled);
+        $process = $delegate->process($request)->willReturn(new Response());
-        $this->middleware->__invoke($request, $response, function ($req, $resp) use (&$isCalled) {
+        $this->middleware->process($request, $delegate->reveal());
-            $isCalled = true;
+        $process->shouldHaveBeenCalledTimes(1);
-        });
-        $this->assertTrue($isCalled);
 
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         )->withMethod('OPTIONS');
-        $response = new Response();
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $isCalled = false;
+        /** @var MethodProphecy $process */
-        $this->assertFalse($isCalled);
+        $process = $delegate->process($request)->willReturn(new Response());
-        $this->middleware->__invoke($request, $response, function ($req, $resp) use (&$isCalled) {
+        $this->middleware->process($request, $delegate->reveal());
-            $isCalled = true;
+        $process->shouldHaveBeenCalledTimes(1);
-        });
-        $this->assertTrue($isCalled);
     }
 
     /**
@@ -85,9 +82,9 @@ class CheckAuthenticationMiddlewareTest extends TestCase
     {
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         );
-        $response = $this->middleware->__invoke($request, new Response());
+        $response = $this->middleware->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(401, $response->getStatusCode());
     }
 
@@ -99,10 +96,11 @@ class CheckAuthenticationMiddlewareTest extends TestCase
         $authToken = 'ABC-abc';
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         )->withHeader(CheckAuthenticationMiddleware::AUTHORIZATION_HEADER, $authToken);
 
-        $response = $this->middleware->__invoke($request, new Response());
+        $response = $this->middleware->process($request, TestUtils::createDelegateMock()->reveal());
+
         $this->assertEquals(401, $response->getStatusCode());
         $this->assertTrue(strpos($response->getBody()->getContents(), 'You need to provide the Bearer type') > 0);
     }
@@ -115,10 +113,11 @@ class CheckAuthenticationMiddlewareTest extends TestCase
         $authToken = 'ABC-abc';
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         )->withHeader(CheckAuthenticationMiddleware::AUTHORIZATION_HEADER, 'Basic ' . $authToken);
 
-        $response = $this->middleware->__invoke($request, new Response());
+        $response = $this->middleware->process($request, TestUtils::createDelegateMock()->reveal());
+
         $this->assertEquals(401, $response->getStatusCode());
         $this->assertTrue(
             strpos($response->getBody()->getContents(), 'Provided authorization type Basic is not supported') > 0
@@ -133,33 +132,33 @@ class CheckAuthenticationMiddlewareTest extends TestCase
         $authToken = 'ABC-abc';
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         )->withHeader(CheckAuthenticationMiddleware::AUTHORIZATION_HEADER, 'Bearer ' . $authToken);
         $this->jwtService->verify($authToken)->willReturn(false)->shouldBeCalledTimes(1);
 
-        $response = $this->middleware->__invoke($request, new Response());
+        $response = $this->middleware->process($request, TestUtils::createDelegateMock()->reveal());
         $this->assertEquals(401, $response->getStatusCode());
     }
 
     /**
      * @test
      */
-    public function provideCorrectTokenUpdatesExpirationAndFallbacksToNextMiddleware()
+    public function provideCorrectTokenUpdatesExpirationAndFallsBackToNextMiddleware()
     {
         $authToken = 'ABC-abc';
         $request = ServerRequestFactory::fromGlobals()->withAttribute(
             RouteResult::class,
-            RouteResult::fromRouteMatch('bar', 'foo', [])
+            RouteResult::fromRoute(new Route('bar', 'foo'), [])
         )->withHeader(CheckAuthenticationMiddleware::AUTHORIZATION_HEADER, 'bearer ' . $authToken);
         $this->jwtService->verify($authToken)->willReturn(true)->shouldBeCalledTimes(1);
         $this->jwtService->refresh($authToken)->willReturn($authToken)->shouldBeCalledTimes(1);
 
-        $isCalled = false;
+        $delegate = $this->prophesize(DelegateInterface::class);
-        $this->assertFalse($isCalled);
+        /** @var MethodProphecy $process */
-        $this->middleware->__invoke($request, new Response(), function ($req, $resp) use (&$isCalled) {
+        $process = $delegate->process($request)->willReturn(new Response());
-            $isCalled = true;
+        $resp = $this->middleware->process($request, $delegate->reveal());
-            return $resp;
+
-        });
+        $process->shouldHaveBeenCalledTimes(1);
-        $this->assertTrue($isCalled);
+        $this->assertArrayHasKey(CheckAuthenticationMiddleware::AUTHORIZATION_HEADER, $resp->getHeaders());
     }
 }

module/Rest/test/Middleware/CrossDomainMiddlewareTest.php

@@ -1,7 +1,10 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Middleware;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use Interop\Http\ServerMiddleware\DelegateInterface;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Argument;
+use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Rest\Middleware\CrossDomainMiddleware;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequestFactory;
@@ -12,10 +15,15 @@ class CrossDomainMiddlewareTest extends TestCase
      * @var CrossDomainMiddleware
      */
     protected $middleware;
+    /**
+     * @var ObjectProphecy
+     */
+    protected $delegate;
 
     public function setUp()
     {
         $this->middleware = new CrossDomainMiddleware();
+        $this->delegate = $this->prophesize(DelegateInterface::class);
     }
 
     /**
@@ -24,13 +32,9 @@ class CrossDomainMiddlewareTest extends TestCase
     public function nonCrossDomainRequestsAreNotAffected()
     {
         $originalResponse = new Response();
-        $response = $this->middleware->__invoke(
+        $this->delegate->process(Argument::any())->willReturn($originalResponse)->shouldbeCalledTimes(1);
-            ServerRequestFactory::fromGlobals(),
+
-            $originalResponse,
+        $response = $this->middleware->process(ServerRequestFactory::fromGlobals(), $this->delegate->reveal());
-            function ($req, $resp) {
-                return $resp;
-            }
-        );
         $this->assertSame($originalResponse, $response);
 
         $headers = $response->getHeaders();
@@ -44,12 +48,11 @@ class CrossDomainMiddlewareTest extends TestCase
     public function anyRequestIncludesTheAllowAccessHeader()
     {
         $originalResponse = new Response();
-        $response = $this->middleware->__invoke(
+        $this->delegate->process(Argument::any())->willReturn($originalResponse)->shouldbeCalledTimes(1);
+
+        $response = $this->middleware->process(
             ServerRequestFactory::fromGlobals()->withHeader('Origin', 'local'),
-            $originalResponse,
+            $this->delegate->reveal()
-            function ($req, $resp) {
-                return $resp;
-            }
         );
         $this->assertNotSame($originalResponse, $response);
 
@@ -64,11 +67,10 @@ class CrossDomainMiddlewareTest extends TestCase
     public function optionsRequestIncludesMoreHeaders()
     {
         $originalResponse = new Response();
-        $request = ServerRequestFactory::fromGlobals(['REQUEST_METHOD' => 'OPTIONS'])->withHeader('Origin', 'local');
+        $request = ServerRequestFactory::fromGlobals()->withMethod('OPTIONS')->withHeader('Origin', 'local');
+        $this->delegate->process(Argument::any())->willReturn($originalResponse)->shouldbeCalledTimes(1);
 
-        $response = $this->middleware->__invoke($request, $originalResponse, function ($req, $resp) {
+        $response = $this->middleware->process($request, $this->delegate->reveal());
-            return $resp;
-        });
         $this->assertNotSame($originalResponse, $response);
 
         $headers = $response->getHeaders();

module/Rest/test/Middleware/PathVersionMiddlewareTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Middleware;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Shlinkio\Shlink\Rest\Middleware\PathVersionMiddleware;
 use Zend\Diactoros\Response;

module/Rest/test/Service/ApiKeyServiceTest.php

@@ -3,7 +3,7 @@ namespace ShlinkioTest\Shlink\Rest\Service;
 
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityRepository;
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
 use Shlinkio\Shlink\Rest\Entity\ApiKey;

module/Rest/test/Util/RestUtilsTest.php

@@ -1,7 +1,7 @@
 <?php
 namespace ShlinkioTest\Shlink\Rest\Util;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Shlinkio\Shlink\Common\Exception\InvalidArgumentException;
 use Shlinkio\Shlink\Common\Exception\WrongIpException;
 use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException;