nextcloud/lib/private/appframework/http/dispatcher.php

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<?php
/**
* ownCloud - App Framework
*
* @author Bernhard Posselt, Thomas Tanghus, Bart Visscher
* @copyright 2012 Bernhard Posselt nukeawhale@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\AppFramework\Http;
use \OC\AppFramework\Middleware\MiddlewareDispatcher;
use \OC\AppFramework\Http;
use \OC\AppFramework\Utility\ControllerMethodReflector;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\Response;
use OCP\IRequest;
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/**
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* Class to dispatch the request to the middleware dispatcher
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*/
class Dispatcher {
private $middlewareDispatcher;
private $protocol;
private $reflector;
private $request;
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/**
* @param Http $protocol the http protocol with contains all status headers
* @param MiddlewareDispatcher $middlewareDispatcher the dispatcher which
* runs the middleware
* @param ControllerMethodReflector the reflector that is used to inject
* the arguments for the controller
* @param IRequest $request the incoming request
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*/
public function __construct(Http $protocol,
MiddlewareDispatcher $middlewareDispatcher,
ControllerMethodReflector $reflector,
IRequest $request) {
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$this->protocol = $protocol;
$this->middlewareDispatcher = $middlewareDispatcher;
$this->reflector = $reflector;
$this->request = $request;
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}
/**
* Handles a request and calls the dispatcher on the controller
* @param Controller $controller the controller which will be called
* @param string $methodName the method name which will be called on
* the controller
* @return array $array[0] contains a string with the http main header,
* $array[1] contains headers in the form: $key => value, $array[2] contains
* the response output
*/
public function dispatch(Controller $controller, $methodName) {
$out = array(null, array(), null);
try {
// prefill reflector with everything thats needed for the
// middlewares
$this->reflector->reflect($controller, $methodName);
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$this->middlewareDispatcher->beforeController($controller,
$methodName);
$response = $this->executeController($controller, $methodName);
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// if an exception appears, the middleware checks if it can handle the
// exception and creates a response. If no response is created, it is
// assumed that theres no middleware who can handle it and the error is
// thrown again
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} catch(\Exception $exception){
$response = $this->middlewareDispatcher->afterException(
$controller, $methodName, $exception);
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if (is_null($response)) {
throw $exception;
}
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}
$response = $this->middlewareDispatcher->afterController(
$controller, $methodName, $response);
// get the output which should be printed and run the after output
// middleware to modify the response
$output = $response->render();
$out[2] = $this->middlewareDispatcher->beforeOutput(
$controller, $methodName, $output);
// depending on the cache object the headers need to be changed
$out[0] = $this->protocol->getStatusHeader($response->getStatus(),
$response->getLastModified(), $response->getETag());
$out[1] = $response->getHeaders();
return $out;
}
/**
* Uses the reflected parameters, types and request parameters to execute
* the controller
* @return Response
*/
private function executeController($controller, $methodName) {
$arguments = array();
// valid types that will be casted
$types = array('int', 'integer', 'bool', 'boolean', 'float');
foreach($this->reflector->getParameters() as $param) {
// try to get the parameter from the request object and cast
// it to the type annotated in the @param annotation
$value = $this->request->getParam($param);
$type = $this->reflector->getType($param);
// if this is submitted using GET or a POST form, 'false' should be
// converted to false
if(($type === 'bool' || $type === 'boolean') &&
$value === 'false' &&
(
$this->request->method === 'GET' ||
strpos($this->request->getHeader('Content-Type'),
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'application/x-www-form-urlencoded') !== false
)
) {
$value = false;
} elseif(in_array($type, $types)) {
settype($value, $type);
}
$arguments[] = $value;
}
$response = call_user_func_array(array($controller, $methodName), $arguments);
// format response if not of type response
if(!($response instanceof Response)) {
// get format from the url format or request format parameter
$format = $this->request->getParam('format');
// if none is given try the first Accept header
if($format === null) {
$header = $this->request->getHeader('Accept');
$formats = explode(',', $header);
if($header !== null && count($formats) > 0) {
$accept = strtolower(trim($formats[0]));
$format = str_replace('application/', '', $accept);
} else {
$format = 'json';
}
}
$response = $controller->formatResponse($response, $format);
}
return $response;
}
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}