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<?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 " . $this->func_name
);
} elseif ( !User::isEveryoneAllowed( 'read' ) && !$wgUser->isAllowed( 'read' ) ) {
wfHttpError(
403,
'Forbidden',
'You are not allowed 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__ );
}
}
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