summaryrefslogtreecommitdiff
path: root/includes/AjaxDispatcher.php
blob: b00cf30941beb00c3f4d904fa65d63ca999782b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
<?php
/**
 * Handle ajax requests and send them to the proper handler.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Ajax
 */

/**
 * @defgroup Ajax Ajax
 */

/**
 * Object-Oriented Ajax functions.
 * @ingroup Ajax
 */
class AjaxDispatcher {
	/**
	 * The way the request was made, either a 'get' or a 'post'
	 * @var string $mode
	 */
	private $mode;

	/**
	 * Name of the requested handler
	 * @var string $func_name
	 */
	private $func_name;

	/** Arguments passed
	 * @var array $args
	 */
	private $args;

	/**
	 * Load up our object with user supplied data
	 */
	function __construct() {
		wfProfileIn( __METHOD__ );

		$this->mode = "";

		if ( ! empty( $_GET["rs"] ) ) {
			$this->mode = "get";
		}

		if ( !empty( $_POST["rs"] ) ) {
			$this->mode = "post";
		}

		switch( $this->mode ) {
			case 'get':
				$this->func_name = isset( $_GET["rs"] ) ? $_GET["rs"] : '';
				if ( ! empty( $_GET["rsargs"] ) ) {
					$this->args = $_GET["rsargs"];
				} else {
					$this->args = array();
				}
				break;
			case 'post':
				$this->func_name = isset( $_POST["rs"] ) ? $_POST["rs"] : '';
				if ( ! empty( $_POST["rsargs"] ) ) {
					$this->args = $_POST["rsargs"];
				} else {
					$this->args = array();
				}
				break;
			default:
				wfProfileOut( __METHOD__ );
				return;
				# Or we could throw an exception:
				# throw new MWException( __METHOD__ . ' called without any data (mode empty).' );
		}

		wfProfileOut( __METHOD__ );
	}

	/**
	 * Pass the request to our internal function.
	 * BEWARE! Data are passed as they have been supplied by the user,
	 * they should be carefully handled in the function processing the
	 * request.
	 */
	function performAction() {
		global $wgAjaxExportList, $wgUser;

		if ( empty( $this->mode ) ) {
			return;
		}

		wfProfileIn( __METHOD__ );

		if ( ! in_array( $this->func_name, $wgAjaxExportList ) ) {
			wfDebug( __METHOD__ . ' Bad Request for unknown function ' . $this->func_name . "\n" );

			wfHttpError(
				400,
				'Bad Request',
				"unknown function " . (string) $this->func_name
			);
		} elseif ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true )
			&& !$wgUser->isAllowed( 'read' ) )
		{
			wfHttpError(
				403,
				'Forbidden',
				'You must log in to view pages.' );
		} else {
			wfDebug( __METHOD__ . ' dispatching ' . $this->func_name . "\n" );

			try {
				$result = call_user_func_array( $this->func_name, $this->args );

				if ( $result === false || $result === null ) {
					wfDebug( __METHOD__ . ' ERROR while dispatching '
							. $this->func_name . "(" . var_export( $this->args, true ) . "): "
							. "no data returned\n" );

					wfHttpError( 500, 'Internal Error',
						"{$this->func_name} returned no data" );
				} else {
					if ( is_string( $result ) ) {
						$result = new AjaxResponse( $result );
					}

					$result->sendHeaders();
					$result->printText();

					wfDebug( __METHOD__ . ' dispatch complete for ' . $this->func_name . "\n" );
				}
			} catch ( Exception $e ) {
				wfDebug( __METHOD__ . ' ERROR while dispatching '
						. $this->func_name . "(" . var_export( $this->args, true ) . "): "
						. get_class( $e ) . ": " . $e->getMessage() . "\n" );

				if ( !headers_sent() ) {
					wfHttpError( 500, 'Internal Error',
						$e->getMessage() );
				} else {
					print $e->getMessage();
				}
			}
		}

		wfProfileOut( __METHOD__ );
	}
}