http/root_controller.php

   1 <?php
   2 // Hoplite
   3 // Copyright (c) 2011 Blue Static
   4 //
   5 // This program is free software: you can redistribute it and/or modify it
   6 // under the terms of the GNU General Public License as published by the Free
   7 // Software Foundation, either version 3 of the License, or any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but WITHOUT
  10 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 // more details.
  13 //
  14 // You should have received a copy of the GNU General Public License along with
  15 // this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 namespace hoplite\http;
  18
  19 require_once HOPLITE_ROOT . '/base/weak_interface.php';
  20 require_once HOPLITE_ROOT . '/http/request.php';
  21 require_once HOPLITE_ROOT . '/http/response.php';
  22 require_once HOPLITE_ROOT . '/http/response_code.php';
  23
  24 /*!
  25   The RootController is meant to be invoked from the index.php of the
  26   application.
  27 */
  28 class RootController
  29 {
  30   /*! @var Request */
  31   private $request = NULL;
  32
  33   /*! @var Response */
  34   private $response = NULL;
  35
  36   /*! @var UrlMap */
  37   private $url_map = NULL;
  38
  39   /*! @var OutputFilter */
  40   private $output_filter = NULL;
  41
  42   /*! @var WeakInterface<RootControllerDelegate> */
  43   private $delegate = NULL;
  44
  45   /*!
  46     Creates the controller with the request context information, typicallhy
  47     from the global scope ($GLOBALS), but can be injected for testing.
  48     @param UrlMap The routing map
  49     @param OutputFilter The object responsible for decorating output.
  50     @param array& PHP globals array
  51   */
  52   public function __construct(array $globals)
  53   {
  54     $this->response = new Response();
  55     $this->request = new Request();
  56     $this->request->data = array(
  57       '_GET'    => &$globals['_GET'],
  58       '_POST'   => &$globals['_POST'],
  59       '_COOKIE' => &$globals['_COOKIE'],
  60       '_SERVER' => &$globals['_SERVER']
  61     );
  62     $this->delegate = new \hoplite\base\WeakInterface('hoplite\http\RootControllerDelegate');
  63   }
  64
  65   /*! Accessors */
  66   public function request() { return $this->request; }
  67   public function response() { return $this->response; }
  68
  69   /*! Sets the UrlMap. */
  70   public function set_url_map(UrlMap $url_map) { $this->url_map = $url_map; }
  71
  72   /*! Sest the Output Filter. */
  73   public function set_output_filter(OutputFilter $output_filter)
  74   {
  75     $this->output_filter = $output_filter;
  76   }
  77
  78   /*! Sets the delegate. */
  79   public function set_delegate($delegate)
  80   {
  81     $this->delegate->Bind($delegate);
  82   }
  83   public function delegate()
  84   {
  85     return $this->delegate->Get();
  86   }
  87
  88   /*!
  89     Createst the Request and Response that are used throughout the duration of
  90     the execution.
  91   */
  92   public function Run()
  93   {
  94     // The query rewriter module of the webserver rewrites a request from:
  95     //    http://example.com/webapp/user/view/42
  96     // to:
  97     //    http://example.com/webapp/index.php/user/view/42
  98     // ... which then becomes accessible from PATH_INFO.
  99     $data = $this->request->data['_SERVER'];
 100     if (isset($data['PATH_INFO']))
 101       $url = $data['PATH_INFO'];
 102     else
 103       $url = '/';
 104     if ($url[0] == '/')
 105       $url = substr($url, 1);
 106
 107     // Set the final pieces of the request.
 108     $this->request->url = $url;
 109     $this->request->http_method = $this->request->data['_SERVER']['REQUEST_METHOD'];
 110
 111     // Extract any PUT data as POST params.
 112     if ($this->request->http_method == 'PUT')
 113       parse_str(file_get_contents('php://input'), $this->request->data['_POST']);
 114
 115     // Register self as the active instance.
 116     $GLOBALS[__CLASS__] = $this;
 117
 118     $this->delegate->OnInitialRequest($this->request, $this->response);
 119
 120     // Dispatch the request to an Action.
 121     $this->RouteRequest($this->request);
 122
 123     // When control returns here, all actions have been invoked and it's time
 124     // to start the output filter and exit.
 125     $this->Stop();
 126   }
 127
 128   /*!
 129     Prevents any other Actions from executing. This starts the OutputFilter and
 130     then exits.
 131   */
 132   public function Stop()
 133   {
 134     $this->delegate->WillStop($this->request, $this->response);
 135     $this->output_filter->FilterOutput($this->request, $this->response);
 136     $this->_Exit();
 137   }
 138
 139   /*!
 140     Sets the response code and stops the controller. Returns void.
 141   */
 142   public function StopWithCode($code)
 143   {
 144     $this->response->response_code = $code;
 145     $this->Stop();
 146   }
 147
 148   /*!
 149     Wrapper around PHP exit().
 150   */
 151   protected function _Exit()
 152   {
 153     exit;
 154   }
 155
 156   /*!
 157     Invoked by Run() and can be invoked by others to evaluate and perform the
 158     lookup in the UrlMap. This then calls InvokeAction().
 159     @param Request The Request whose URL will be routed
 160   */
 161   public function RouteRequest(Request $request)
 162   {
 163     $this->delegate->WillRouteRequest($request, $this->response);
 164
 165     $url_map_value = $this->url_map->Evaluate($request);
 166
 167     $action = NULL;
 168     if ($url_map_value)
 169       $action = $this->url_map->LookupAction($url_map_value);
 170
 171     if (!$action) {
 172       $this->response->response_code = ResponseCode::NOT_FOUND;
 173       $this->Stop();
 174       return;
 175     }
 176
 177     $this->InvokeAction($action);
 178   }
 179
 180   /*!
 181     Used to run an Action and drive it through its states.
 182     @param Action
 183   */
 184   public function InvokeAction(Action $action)
 185   {
 186     $this->delegate->WillInvokeAction($action, $this->request, $this->response);
 187
 188     $action->FilterRequest($this->request, $this->response);
 189     $action->Invoke($this->request, $this->response);
 190     $action->FilterResponse($this->request, $this->response);
 191
 192     $this->delegate->DidInvokeAction($action, $this->request, $this->response);
 193   }
 194
 195   /*!
 196     Performs a reverse-lookup in the UrlMap for the pattern/fragment for the
 197     name of a given Action class.
 198     @param string Class name.
 199   */
 200   public function LookupAction($class)
 201   {
 202     $map = $this->url_map->map();
 203     foreach ($map as $pattern => $action) {
 204       if ($action == $class)
 205         return $pattern;
 206     }
 207   }
 208
 209   /*!
 210     Given a relative path, return an absolute path from the root controller.
 211     @param string The relative path for which a URL will be created
 212     @param bool Include the HTTP scheme and host to create an RFC URL if true;
 213                 if false an absolute path will be returned.
 214   */
 215   public function MakeURL($new_path, $url = FALSE)
 216   {
 217     // Detect the common paths between the REQUEST_URI and the PATH_INFO. That
 218     // common piece will be the path to the root controller.
 219     $request_uri = $this->request()->data['_SERVER']['REQUEST_URI'];
 220     $path_info = $this->request()->data['_SERVER']['PATH_INFO'];
 221     if ($path_info === NULL)
 222       $common_uri = substr($request_uri, 0, -1);
 223     else
 224       $common_uri = strstr($request_uri, $path_info, TRUE);
 225
 226     // If just constructing an absolute path, return that now.
 227     if (!$url)
 228       return $common_uri . $new_path;
 229
 230     // Otherwise, build the host part.
 231     $url = 'http';
 232     if (isset($this->request()->data['_SERVER']['HTTPS']) &&
 233         $this->request()->data['_SERVER']['HTTPS'] == 'on') {
 234       $url .= 's';
 235     }
 236     $url .= '://' . $this->request()->data['_SERVER']['HTTP_HOST'];
 237
 238     $port = $this->request()->data['_SERVER']['SERVER_PORT'];
 239     if ($port != 80 && $port != 443)
 240       $url .= ':' . $port;
 241
 242     $url .= $common_uri;
 243     return $url . $new_path;
 244   }
 245 }
 246
 247 /*!
 248   Delegate for the root controller. The controller uses WeakInterface to call
 249   these methods, so they're all optional.
 250 */
 251 interface RootControllerDelegate
 252 {
 253   public function OnInitialRequest(Request $request, Response $response);
 254
 255   public function WillRouteRequest(Request $request, Response $response);
 256
 257   public function WillInvokeAction(Action $action, Request $request, Response $response);
 258
 259   public function DidInvokeAction(Action $action, Request $request, Response $response);
 260
 261   public function WillStop(Request $request, Response $response);
 262 }