includes/AjaxDispatcher.php

   1 <?php
   2 /**
   3  * Handle ajax requests and send them to the proper handler.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Ajax
  22  */
  23
  24 /**
  25  * @defgroup Ajax Ajax
  26  */
  27
  28 /**
  29  * Object-Oriented Ajax functions.
  30  * @ingroup Ajax
  31  */
  32 class AjaxDispatcher {
  33         /**
  34          * The way the request was made, either a 'get' or a 'post'
  35          * @var string $mode
  36          */
  37         private $mode;
  38
  39         /**
  40          * Name of the requested handler
  41          * @var string $func_name
  42          */
  43         private $func_name;
  44
  45         /** Arguments passed
  46          * @var array $args
  47          */
  48         private $args;
  49
  50         /**
  51          * Load up our object with user supplied data
  52          */
  53         function __construct() {
  54                 wfProfileIn( __METHOD__ );
  55
  56                 $this->mode = "";
  57
  58                 if ( !empty( $_GET["rs"] ) ) {
  59                         $this->mode = "get";
  60                 }
  61
  62                 if ( !empty( $_POST["rs"] ) ) {
  63                         $this->mode = "post";
  64                 }
  65
  66                 switch ( $this->mode ) {
  67                         case 'get':
  68                                 $this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
  69                                 if ( !empty( $_GET["rsargs"] ) ) {
  70                                         $this->args = $_GET["rsargs"];
  71                                 } else {
  72                                         $this->args = array();
  73                                 }
  74                                 break;
  75                         case 'post':
  76                                 $this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
  77                                 if ( !empty( $_POST["rsargs"] ) ) {
  78                                         $this->args = $_POST["rsargs"];
  79                                 } else {
  80                                         $this->args = array();
  81                                 }
  82                                 break;
  83                         default:
  84                                 wfProfileOut( __METHOD__ );
  85                                 return;
  86                                 # Or we could throw an exception:
  87                                 # throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
  88                 }
  89
  90                 wfProfileOut( __METHOD__ );
  91         }
  92
  93         /**
  94          * Pass the request to our internal function.
  95          * BEWARE! Data are passed as they have been supplied by the user,
  96          * they should be carefully handled in the function processing the
  97          * request.
  98          */
  99         function performAction() {
 100                 global $wgAjaxExportList, $wgUser;
 101
 102                 if ( empty( $this->mode ) ) {
 103                         return;
 104                 }
 105
 106                 wfProfileIn( __METHOD__ );
 107
 108                 if ( !in_array( $this->func_name, $wgAjaxExportList ) ) {
 109                         wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name . "\n" );
 110
 111                         wfHttpError(
 112                                 400,
 113                                 'Bad Request',
 114                                 "unknown function " . $this->func_name
 115                         );
 116                 } elseif ( !User::isEveryoneAllowed( 'read' ) && !$wgUser->isAllowed( 'read' ) ) {
 117                         wfHttpError(
 118                                 403,
 119                                 'Forbidden',
 120                                 'You are not allowed to view pages.' );
 121                 } else {
 122                         wfDebug( __METHOD__ . ' dispatching ' . $this->func_name . "\n" );
 123
 124                         try {
 125                                 $result = call_user_func_array( $this->func_name, $this->args );
 126
 127                                 if ( $result === false || $result === null ) {
 128                                         wfDebug( __METHOD__ . ' ERROR while dispatching '
 129                                                         . $this->func_name . "(" . var_export( $this->args, true ) . "): "
 130                                                         . "no data returned\n" );
 131
 132                                         wfHttpError( 500, 'Internal Error',
 133                                                 "{$this->func_name} returned no data" );
 134                                 } else {
 135                                         if ( is_string( $result ) ) {
 136                                                 $result = new AjaxResponse( $result );
 137                                         }
 138
 139                                         $result->sendHeaders();
 140                                         $result->printText();
 141
 142                                         wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name . "\n" );
 143                                 }
 144                         } catch ( Exception $e ) {
 145                                 wfDebug( __METHOD__ . ' ERROR while dispatching '
 146                                                 . $this->func_name . "(" . var_export( $this->args, true ) . "): "
 147                                                 . get_class( $e ) . ": " . $e->getMessage() . "\n" );
 148
 149                                 if ( !headers_sent() ) {
 150                                         wfHttpError( 500, 'Internal Error',
 151                                                 $e->getMessage() );
 152                                 } else {
 153                                         print $e->getMessage();
 154                                 }
 155                         }
 156                 }
 157
 158                 wfProfileOut( __METHOD__ );
 159         }
 160 }