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Add a listener for application/problem-api+json
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Jurian Sluiman
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Oct 3, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,190 @@ | ||
| <?php | ||
| /** | ||
| * Copyright (c) 2012-2013 Jurian Sluiman. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * | ||
| * * Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * | ||
| * * Neither the names of the copyright holders nor the names of the | ||
| * contributors may be used to endorse or promote products derived | ||
| * from this software without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| * @author Jurian Sluiman <[email protected]> | ||
| * @copyright 2012-2013 Jurian Sluiman http://juriansluiman.nl. | ||
| * @license http://www.opensource.org/licenses/bsd-license.php BSD License | ||
| */ | ||
|
|
||
| namespace SlmException\Mvc; | ||
|
|
||
| use Zend\EventManager\ListenerAggregateInterface; | ||
| use Zend\EventManager\EventManagerInterface; | ||
| use Zend\Http\Request as HttpRequest; | ||
| use Zend\Mvc\MvcEvent; | ||
| use Zend\View\Model\JsonModel; | ||
| use Zend\View\Model\ModelInterface; | ||
|
|
||
| class JsonProblemApiListener implements ListenerAggregateInterface | ||
| { | ||
| protected $listeners; | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| public function attach(EventManagerInterface $events) | ||
| { | ||
| $this->listeners[] = $events->attach(MvcEvent::EVENT_RENDER, array($this, 'onRender'), 1000); | ||
| $this->listeners[] = $events->attach(MvcEvent::EVENT_FINISH, array($this, 'onFinish')); | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| public function detach(EventManagerInterface $events) | ||
| { | ||
| foreach ($this->listeners as $key => $listener) { | ||
| $detached = false; | ||
| if ($listener === $this) { | ||
| continue; | ||
| } | ||
| if ($listener instanceof ListenerAggregateInterface) { | ||
| $detached = $listener->detach($events); | ||
| } elseif ($listener instanceof CallbackHandler) { | ||
| $detached = $events->detach($listener); | ||
| } | ||
|
|
||
| if ($detached) { | ||
| unset($this->listeners[$key]); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public function onRender(MvcEvent $e) | ||
| { | ||
| // must be an error | ||
| if (!$e->isError()) { | ||
| return; | ||
| } | ||
|
|
||
| // Check the accept headers for application/json | ||
| $request = $e->getRequest(); | ||
| if (!$request instanceof HttpRequest) { | ||
| return; | ||
| } | ||
|
|
||
| $headers = $request->getHeaders(); | ||
| if (!$headers->has('Accept')) { | ||
| return; | ||
| } | ||
|
|
||
| $accept = $headers->get('Accept'); | ||
| $match = $accept->match('application/json'); | ||
| if (!$match || $match->getTypeString() == '*/*') { | ||
| // not application/json | ||
| return; | ||
| } | ||
|
|
||
| // if we have a JsonModel in the result, then do nothing | ||
| $currentModel = $e->getResult(); | ||
| if ($currentModel instanceof JsonModel) { | ||
| return; | ||
| } | ||
|
|
||
| // create a new JsonModel - use application/api-problem+json fields. | ||
| $response = $e->getResponse(); | ||
| $model = new JsonModel(array( | ||
| "httpStatus" => $response->getStatusCode(), | ||
| "title" => $response->getReasonPhrase(), | ||
| )); | ||
|
|
||
| // Find out what the error is | ||
| $exception = $currentModel->getVariable('exception'); | ||
|
|
||
| if ($currentModel instanceof ModelInterface && $currentModel->reason) { | ||
| switch ($currentModel->reason) { | ||
| case 'error-controller-cannot-dispatch': | ||
| $model->detail = 'The requested controller was unable to dispatch the request.'; | ||
| break; | ||
| case 'error-controller-not-found': | ||
| $model->detail = 'The requested controller could not be mapped to an existing controller class.'; | ||
| break; | ||
| case 'error-controller-invalid': | ||
| $model->detail = 'The requested controller was not dispatchable.'; | ||
| break; | ||
| case 'error-router-no-match': | ||
| $model->detail = 'The requested URL could not be matched by routing.'; | ||
| break; | ||
| default: | ||
| $model->detail = $currentModel->message; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if ($exception) { | ||
| if ($exception->getCode()) { | ||
| $e->getResponse()->setStatusCode($exception->getCode()); | ||
| } | ||
| $model->detail = $exception->getMessage(); | ||
|
|
||
| // find the previous exceptions | ||
| $messages = array(); | ||
| while ($exception = $exception->getPrevious()) { | ||
| $messages[] = "* " . $exception->getMessage(); | ||
| }; | ||
| if (count($messages)) { | ||
| $exceptionString = implode("\n", $messages); | ||
| $model->messages = $exceptionString; | ||
| } | ||
| } | ||
|
|
||
| // set our new view model | ||
| $model->setTerminal(true); | ||
| $e->setResult($model); | ||
| $e->setViewModel($model); | ||
|
|
||
| // set our json renderer | ||
| $sm = $e->getApplication()->getServiceManager(); | ||
| $view = $sm->get('Zend\View\View'); | ||
| $strategy = $sm->get('ViewJsonStrategy'); | ||
| $view->getEventManager()->attach($strategy, 100); | ||
| } | ||
|
|
||
| public function onFinish(MvcEvent $e) | ||
| { | ||
| $response = $e->getResponse(); | ||
| $headers = $response->getHeaders(); | ||
|
|
||
| if ($headers->has('Content-Type') | ||
| && strpos($headers->get('Content-Type')->getFieldValue(), 'application/json') !== false | ||
| && strpos($response->getContent(), 'httpStatus') !== false | ||
| ){ | ||
| /** | ||
| * We can almost be certain the response is an api problem, | ||
| * since the JSON contains httpStatus | ||
| */ | ||
| $headers->addHeaderLine('Content-Type', 'application/api-problem+json'); | ||
| } | ||
| } | ||
| } |