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          * @var Config
  52          */
  53         private $config;
  54
  55         /**
  56          * Load up our object with user supplied data
  57          */
  58         function __construct( Config $config ) {
  59                 $this->config = $config;
  60
  61                 $this->mode = "";
  62
  63                 if ( !empty( $_GET["rs"] ) ) {
  64                         $this->mode = "get";
  65                 }
  66
  67                 if ( !empty( $_POST["rs"] ) ) {
  68                         $this->mode = "post";
  69                 }
  70
  71                 switch ( $this->mode ) {
  72                         case 'get':
  73                                 $this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
  74                                 if ( !empty( $_GET["rsargs"] ) ) {
  75                                         $this->args = $_GET["rsargs"];
  76                                 } else {
  77                                         $this->args = array();
  78                                 }
  79                                 break;
  80                         case 'post':
  81                                 $this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
  82                                 if ( !empty( $_POST["rsargs"] ) ) {
  83                                         $this->args = $_POST["rsargs"];
  84                                 } else {
  85                                         $this->args = array();
  86                                 }
  87                                 break;
  88                         default:
  89                                 return;
  90                                 # Or we could throw an exception:
  91                                 # throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
  92                 }
  93
  94         }
  95
  96         /**
  97          * Pass the request to our internal function.
  98          * BEWARE! Data are passed as they have been supplied by the user,
  99          * they should be carefully handled in the function processing the
 100          * request.
 101          *
 102          * @param User $user
 103          */
 104         function performAction( User $user ) {
 105                 if ( empty( $this->mode ) ) {
 106                         return;
 107                 }
 108
 109                 if ( !in_array( $this->func_name, $this->config->get( 'AjaxExportList' ) ) ) {
 110                         wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name . "\n" );
 111                         wfHttpError(
 112                                 400,
 113                                 'Bad Request',
 114                                 "unknown function " . $this->func_name
 115                         );
 116                 } elseif ( !User::isEveryoneAllowed( 'read' ) && !$user->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                         try {
 124                                 $result = call_user_func_array( $this->func_name, $this->args );
 125
 126                                 if ( $result === false || $result === null ) {
 127                                         wfDebug( __METHOD__ . ' ERROR while dispatching ' .
 128                                                 $this->func_name . "(" . var_export( $this->args, true ) . "): " .
 129                                                 "no data returned\n" );
 130
 131                                         wfHttpError( 500, 'Internal Error',
 132                                                 "{$this->func_name} returned no data" );
 133                                 } else {
 134                                         if ( is_string( $result ) ) {
 135                                                 $result = new AjaxResponse( $result );
 136                                         }
 137
 138                                         // Make sure DB commit succeeds before sending a response
 139                                         wfGetLBFactory()->commitMasterChanges( __METHOD__ );
 140
 141                                         $result->sendHeaders();
 142                                         $result->printText();
 143
 144                                         wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name . "\n" );
 145                                 }
 146                         } catch ( Exception $e ) {
 147                                 wfDebug( __METHOD__ . ' ERROR while dispatching ' .
 148                                         $this->func_name . "(" . var_export( $this->args, true ) . "): " .
 149                                         get_class( $e ) . ": " . $e->getMessage() . "\n" );
 150
 151                                 if ( !headers_sent() ) {
 152                                         wfHttpError( 500, 'Internal Error',
 153                                                 $e->getMessage() );
 154                                 } else {
 155                                         print $e->getMessage();
 156                                 }
 157                         }
 158                 }
 159
 160         }
 161 }