api.php

   1 <?php
   2
   3 /**
   4  * API for MediaWiki 1.8+
   5  *
   6  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * This file is the entry point for all API queries. It begins by checking
  28  * whether the API is enabled on this wiki; if not, it informs the user that
  29  * s/he should set $wgEnableAPI to true and exits. Otherwise, it constructs
  30  * a new ApiMain using the parameter passed to it as an argument in the URL
  31  * ('?action=') and with write-enabled set to the value of $wgEnableWriteAPI
  32  * as specified in LocalSettings.php. It then invokes "execute()" on the
  33  * ApiMain object instance, which produces output in the format sepecified
  34  * in the URL.
  35  */
  36
  37 // So extensions (and other code) can check whether they're running in API mode
  38 define( 'MW_API', true );
  39
  40 // We want a plain message on catastrophic errors that machines can identify
  41 function wfDie( $msg = '' ) {
  42         header( $_SERVER['SERVER_PROTOCOL'] . ' 500 MediaWiki configuration Error', true, 500 );
  43         echo $msg;
  44         die( 1 );
  45 }
  46
  47 // Die on unsupported PHP versions
  48 if( !function_exists( 'version_compare' ) || version_compare( phpversion(), '5.2.3' ) < 0 ){
  49         $version = htmlspecialchars( $wgVersion );
  50         wfDie( "MediaWiki $version requires at least PHP version 5.2.3." );
  51 }
  52
  53 // Initialise common code.
  54 require ( dirname( __FILE__ ) . '/includes/WebStart.php' );
  55
  56 wfProfileIn( 'api.php' );
  57 $starttime = microtime( true );
  58
  59 // URL safety checks
  60 //
  61 // See RawPage.php for details; summary is that MSIE can override the
  62 // Content-Type if it sees a recognized extension on the URL, such as
  63 // might be appended via PATH_INFO after 'api.php'.
  64 //
  65 // Some data formats can end up containing unfiltered user-provided data
  66 // which will end up triggering HTML detection and execution, hence
  67 // XSS injection and all that entails.
  68 //
  69 if ( $wgRequest->isPathInfoBad() ) {
  70         wfHttpError( 403, 'Forbidden',
  71                 'Invalid file extension found in PATH_INFO or QUERY_STRING.' );
  72         return;
  73 }
  74
  75 // Verify that the API has not been disabled
  76 if ( !$wgEnableAPI ) {
  77         wfDie( 'MediaWiki API is not enabled for this site. Add the following line to your LocalSettings.php'
  78                 . '<pre><b>$wgEnableAPI=true;</b></pre>'
  79         );
  80 }
  81
  82 // Selectively allow cross-site AJAX
  83
  84 /*
  85  * Helper function to convert wildcard string into a regex
  86  * '*' => '.*?'
  87  * '?' => '.'
  88  * @ return string
  89  */
  90 function convertWildcard( $search ) {
  91         $search = preg_quote( $search, '/' );
  92         $search = str_replace(
  93                 array( '\*', '\?' ),
  94                 array( '.*?', '.' ),
  95                 $search
  96         );
  97         return "/$search/";
  98 }
  99
 100 if ( $wgCrossSiteAJAXdomains && isset( $_SERVER['HTTP_ORIGIN'] ) ) {
 101         $exceptions = array_map( 'convertWildcard', $wgCrossSiteAJAXdomainExceptions );
 102         $regexes = array_map( 'convertWildcard', $wgCrossSiteAJAXdomains );
 103         foreach ( $regexes as $regex ) {
 104                 if ( preg_match( $regex, $_SERVER['HTTP_ORIGIN'] ) ) {
 105                         foreach ( $exceptions as $exc ) { // Check against exceptions
 106                                 if ( preg_match( $exc, $_SERVER['HTTP_ORIGIN'] ) ) {
 107                                         break 2;
 108                                 }
 109                         }
 110                         header( "Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}" );
 111                         header( 'Access-Control-Allow-Credentials: true' );
 112                         break;
 113                 }
 114         }
 115 }
 116
 117 // Set a dummy $wgTitle, because $wgTitle == null breaks various things
 118 // In a perfect world this wouldn't be necessary
 119 $wgTitle = Title::makeTitle( NS_MAIN, 'API' );
 120
 121 /* Construct an ApiMain with the arguments passed via the URL. What we get back
 122  * is some form of an ApiMain, possibly even one that produces an error message,
 123  * but we don't care here, as that is handled by the ctor.
 124  */
 125 $processor = new ApiMain( $wgRequest, $wgEnableWriteAPI );
 126
 127 // Process data & print results
 128 $processor->execute();
 129
 130 // Execute any deferred updates
 131 wfDoUpdates();
 132
 133 // Log what the user did, for book-keeping purposes.
 134 $endtime = microtime( true );
 135 wfProfileOut( 'api.php' );
 136 wfLogProfilingData();
 137
 138 // Log the request
 139 if ( $wgAPIRequestLog ) {
 140         $items = array(
 141                         wfTimestamp( TS_MW ),
 142                         $endtime - $starttime,
 143                         wfGetIP(),
 144                         $_SERVER['HTTP_USER_AGENT']
 145         );
 146         $items[] = $wgRequest->wasPosted() ? 'POST' : 'GET';
 147         $module = $processor->getModule();
 148         if ( $module->mustBePosted() ) {
 149                 $items[] = "action=" . $wgRequest->getVal( 'action' );
 150         } else {
 151                 $items[] = wfArrayToCGI( $wgRequest->getValues() );
 152         }
 153         wfErrorLog( implode( ',', $items ) . "\n", $wgAPIRequestLog );
 154         wfDebug( "Logged API request to $wgAPIRequestLog\n" );
 155 }
 156
 157 // Shut down the database.  foo()->bar() syntax is not supported in PHP4: we won't ever actually
 158 // get here to worry about whether this should be = or =&, but the file has to parse properly.
 159 $lb = wfGetLBFactory();
 160 $lb->shutdown();
 161