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[autoinstalls/mediawiki.git] / includes / AjaxDispatcher.php
1 <?php
2 /**
3  * @defgroup Ajax Ajax
4  *
5  * @file
6  * @ingroup Ajax
7  * Handle ajax requests and send them to the proper handler.
8  */
9
10 if ( !( defined( 'MEDIAWIKI' ) && $wgUseAjax ) ) {
11         die( 1 );
12 }
13
14 require_once( 'AjaxFunctions.php' );
15
16 /**
17  * Object-Oriented Ajax functions.
18  * @ingroup Ajax
19  */
20 class AjaxDispatcher {
21         /** The way the request was made, either a 'get' or a 'post' */
22         private $mode;
23
24         /** Name of the requested handler */
25         private $func_name;
26
27         /** Arguments passed */
28         private $args;
29
30         /** Load up our object with user supplied data */
31         function __construct() {
32                 wfProfileIn( __METHOD__ );
33
34                 $this->mode = "";
35
36                 if ( ! empty( $_GET["rs"] ) ) {
37                         $this->mode = "get";
38                 }
39
40                 if ( !empty( $_POST["rs"] ) ) {
41                         $this->mode = "post";
42                 }
43
44                 switch( $this->mode ) {
45
46                 case 'get':
47                         $this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
48                         if ( ! empty( $_GET["rsargs"] ) ) {
49                                 $this->args = $_GET["rsargs"];
50                         } else {
51                                 $this->args = array();
52                         }
53                 break;
54
55                 case 'post':
56                         $this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
57                         if ( ! empty( $_POST["rsargs"] ) ) {
58                                 $this->args = $_POST["rsargs"];
59                         } else {
60                                 $this->args = array();
61                         }
62                 break;
63
64                 default:
65                         wfProfileOut( __METHOD__ );
66                         return;
67                         # Or we could throw an exception:
68                         # throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
69
70                 }
71
72                 wfProfileOut( __METHOD__ );
73         }
74
75         /** Pass the request to our internal function.
76          * BEWARE! Data are passed as they have been supplied by the user,
77          * they should be carefully handled in the function processing the
78          * request.
79          */
80         function performAction() {
81                 global $wgAjaxExportList, $wgOut;
82
83                 if ( empty( $this->mode ) ) {
84                         return;
85                 }
86
87                 wfProfileIn( __METHOD__ );
88
89                 if ( ! in_array( $this->func_name, $wgAjaxExportList ) ) {
90                         wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name . "\n" );
91
92                         wfHttpError( 400, 'Bad Request',
93                                 "unknown function " . (string) $this->func_name );
94                 } else {
95                         wfDebug( __METHOD__ . ' dispatching ' . $this->func_name . "\n" );
96
97                         if ( strpos( $this->func_name, '::' ) !== false ) {
98                                 $func = explode( '::', $this->func_name, 2 );
99                         } else {
100                                 $func = $this->func_name;
101                         }
102                         try {
103                                 $result = call_user_func_array( $func, $this->args );
104
105                                 if ( $result === false || $result === null ) {
106                                         wfDebug( __METHOD__ . ' ERROR while dispatching '
107                                                         . $this->func_name . "(" . var_export( $this->args, true ) . "): "
108                                                         . "no data returned\n" );
109
110                                         wfHttpError( 500, 'Internal Error',
111                                                 "{$this->func_name} returned no data" );
112                                 }
113                                 else {
114                                         if ( is_string( $result ) ) {
115                                                 $result = new AjaxResponse( $result );
116                                         }
117
118                                         $result->sendHeaders();
119                                         $result->printText();
120
121                                         wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name . "\n" );
122                                 }
123
124                         } catch ( Exception $e ) {
125                                 wfDebug( __METHOD__ . ' ERROR while dispatching '
126                                                 . $this->func_name . "(" . var_export( $this->args, true ) . "): "
127                                                 . get_class( $e ) . ": " . $e->getMessage() . "\n" );
128
129                                 if ( !headers_sent() ) {
130                                         wfHttpError( 500, 'Internal Error',
131                                                 $e->getMessage() );
132                                 } else {
133                                         print $e->getMessage();
134                                 }
135                         }
136                 }
137
138                 wfProfileOut( __METHOD__ );
139                 $wgOut = null;
140         }
141 }