includes/AjaxDispatcher.php

   1 <?php
   2 /**
   3  * Handle ajax requests and send them to the proper handler.
   4  */
   5
   6 if( !(defined( 'MEDIAWIKI' ) && $wgUseAjax ) ) {
   7         die( 1 );
   8 }
   9
  10 require_once( 'AjaxFunctions.php' );
  11
  12 /**
  13  * Object-Oriented Ajax functions.
  14  * @addtogroup Ajax
  15  */
  16 class AjaxDispatcher {
  17         /** The way the request was made, either a 'get' or a 'post' */
  18         private $mode;
  19
  20         /** Name of the requested handler */
  21         private $func_name;
  22
  23         /** Arguments passed */
  24         private $args;
  25
  26         /** Load up our object with user supplied data */
  27         function __construct() {
  28                 wfProfileIn( __METHOD__ );
  29
  30                 $this->mode = "";
  31
  32                 if (! empty($_GET["rs"])) {
  33                         $this->mode = "get";
  34                 }
  35
  36                 if (!empty($_POST["rs"])) {
  37                         $this->mode = "post";
  38                 }
  39
  40                 switch( $this->mode ) {
  41
  42                 case 'get':
  43                         $this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
  44                         if (! empty($_GET["rsargs"])) {
  45                                 $this->args = $_GET["rsargs"];
  46                         } else {
  47                                 $this->args = array();
  48                         }
  49                 break;
  50
  51                 case 'post':
  52                         $this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
  53                         if (! empty($_POST["rsargs"])) {
  54                                 $this->args = $_POST["rsargs"];
  55                         } else {
  56                                 $this->args = array();
  57                         }
  58                 break;
  59
  60                 default:
  61                         wfProfileOut( __METHOD__ );
  62                         return;
  63                         # Or we could throw an exception:
  64                         #throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
  65
  66                 }
  67
  68                 wfProfileOut( __METHOD__ );
  69         }
  70
  71         /** Pass the request to our internal function.
  72          * BEWARE! Data are passed as they have been supplied by the user,
  73          * they should be carefully handled in the function processing the
  74          * request.
  75          */
  76         function performAction() {
  77                 global $wgAjaxExportList, $wgOut;
  78
  79                 if ( empty( $this->mode ) ) {
  80                         return;
  81                 }
  82                 wfProfileIn( __METHOD__ );
  83
  84                 if (! in_array( $this->func_name, $wgAjaxExportList ) ) {
  85                         wfHttpError( 400, 'Bad Request',
  86                                 "unknown function " . (string) $this->func_name );
  87                 } else {
  88                         if ( strpos( $this->func_name, '::' ) !== false ) {
  89                                 $func = explode( '::', $this->func_name, 2 );
  90                         } else {
  91                                 $func = $this->func_name;
  92                         }
  93                         try {
  94                                 $result = call_user_func_array($func, $this->args);
  95
  96                                 if ( $result === false || $result === NULL ) {
  97                                         wfHttpError( 500, 'Internal Error',
  98                                                 "{$this->func_name} returned no data" );
  99                                 }
 100                                 else {
 101                                         if ( is_string( $result ) ) {
 102                                                 $result= new AjaxResponse( $result );
 103                                         }
 104
 105                                         $result->sendHeaders();
 106                                         $result->printText();
 107                                 }
 108
 109                         } catch (Exception $e) {
 110                                 if (!headers_sent()) {
 111                                         wfHttpError( 500, 'Internal Error',
 112                                                 $e->getMessage() );
 113                                 } else {
 114                                         print $e->getMessage();
 115                                 }
 116                         }
 117                 }
 118
 119                 wfProfileOut( __METHOD__ );
 120                 $wgOut = null;
 121         }
 122 }