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path: root/includes/api/ApiQueryInfo.php
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<?php

/*
 * Created on Sep 25, 2006
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
 *
 * 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.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if ( !defined( 'MEDIAWIKI' ) ) {
	// Eclipse helper - will be ignored in production
	require_once ( 'ApiQueryBase.php' );
}

/**
 * A query module to show basic page information.
 *
 * @ingroup API
 */
class ApiQueryInfo extends ApiQueryBase {

	private $fld_protection = false, $fld_talkid = false,
		$fld_subjectid = false, $fld_url = false,
		$fld_readable = false, $fld_watched = false,
		$fld_preload = false;

	public function __construct( $query, $moduleName ) {
		parent :: __construct( $query, $moduleName, 'in' );
	}

	public function requestExtraData( $pageSet ) {
		$pageSet->requestField( 'page_restrictions' );
		$pageSet->requestField( 'page_is_redirect' );
		$pageSet->requestField( 'page_is_new' );
		$pageSet->requestField( 'page_counter' );
		$pageSet->requestField( 'page_touched' );
		$pageSet->requestField( 'page_latest' );
		$pageSet->requestField( 'page_len' );
	}

	/**
	 * Get an array mapping token names to their handler functions.
	 * The prototype for a token function is func($pageid, $title)
	 * it should return a token or false (permission denied)
	 * @return array(tokenname => function)
	 */
	protected function getTokenFunctions() {
		// Don't call the hooks twice
		if ( isset( $this->tokenFunctions ) )
			return $this->tokenFunctions;

		// If we're in JSON callback mode, no tokens can be obtained
		if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) )
			return array();

		$this->tokenFunctions = array(
			'edit' => array( 'ApiQueryInfo', 'getEditToken' ),
			'delete' => array( 'ApiQueryInfo', 'getDeleteToken' ),
			'protect' => array( 'ApiQueryInfo', 'getProtectToken' ),
			'move' => array( 'ApiQueryInfo', 'getMoveToken' ),
			'block' => array( 'ApiQueryInfo', 'getBlockToken' ),
			'unblock' => array( 'ApiQueryInfo', 'getUnblockToken' ),
			'email' => array( 'ApiQueryInfo', 'getEmailToken' ),
			'import' => array( 'ApiQueryInfo', 'getImportToken' ),
		);
		wfRunHooks( 'APIQueryInfoTokens', array( &$this->tokenFunctions ) );
		return $this->tokenFunctions;
	}

	public static function getEditToken( $pageid, $title )
	{
		// We could check for $title->userCan('edit') here,
		// but that's too expensive for this purpose
		// and would break caching
		global $wgUser;
		if ( !$wgUser->isAllowed( 'edit' ) )
			return false;

		// The edit token is always the same, let's exploit that
		static $cachedEditToken = null;
		if ( !is_null( $cachedEditToken ) )
			return $cachedEditToken;

		$cachedEditToken = $wgUser->editToken();
		return $cachedEditToken;
	}

	public static function getDeleteToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->isAllowed( 'delete' ) )
			return false;

		static $cachedDeleteToken = null;
		if ( !is_null( $cachedDeleteToken ) )
			return $cachedDeleteToken;

		$cachedDeleteToken = $wgUser->editToken();
		return $cachedDeleteToken;
	}

	public static function getProtectToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->isAllowed( 'protect' ) )
			return false;

		static $cachedProtectToken = null;
		if ( !is_null( $cachedProtectToken ) )
			return $cachedProtectToken;

		$cachedProtectToken = $wgUser->editToken();
		return $cachedProtectToken;
	}

	public static function getMoveToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->isAllowed( 'move' ) )
			return false;

		static $cachedMoveToken = null;
		if ( !is_null( $cachedMoveToken ) )
			return $cachedMoveToken;

		$cachedMoveToken = $wgUser->editToken();
		return $cachedMoveToken;
	}

	public static function getBlockToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->isAllowed( 'block' ) )
			return false;

		static $cachedBlockToken = null;
		if ( !is_null( $cachedBlockToken ) )
			return $cachedBlockToken;

		$cachedBlockToken = $wgUser->editToken();
		return $cachedBlockToken;
	}

	public static function getUnblockToken( $pageid, $title )
	{
		// Currently, this is exactly the same as the block token
		return self::getBlockToken( $pageid, $title );
	}

	public static function getEmailToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->canSendEmail() || $wgUser->isBlockedFromEmailUser() )
			return false;

		static $cachedEmailToken = null;
		if ( !is_null( $cachedEmailToken ) )
			return $cachedEmailToken;

		$cachedEmailToken = $wgUser->editToken();
		return $cachedEmailToken;
	}

	public static function getImportToken( $pageid, $title )
	{
		global $wgUser;
		if ( !$wgUser->isAllowed( 'import' ) )
			return false;

		static $cachedImportToken = null;
		if ( !is_null( $cachedImportToken ) )
			return $cachedImportToken;

		$cachedImportToken = $wgUser->editToken();
		return $cachedImportToken;
	}

	public function execute() {
		$this->params = $this->extractRequestParams();
		if ( !is_null( $this->params['prop'] ) ) {
			$prop = array_flip( $this->params['prop'] );
			$this->fld_protection = isset( $prop['protection'] );
			$this->fld_watched = isset( $prop['watched'] );
			$this->fld_talkid = isset( $prop['talkid'] );
			$this->fld_subjectid = isset( $prop['subjectid'] );
			$this->fld_url = isset( $prop['url'] );
			$this->fld_readable = isset( $prop['readable'] );
			$this->fld_preload = isset ( $prop['preload'] );
		}

		$pageSet = $this->getPageSet();
		$this->titles = $pageSet->getGoodTitles();
		$this->missing = $pageSet->getMissingTitles();
		$this->everything = $this->titles + $this->missing;
		$result = $this->getResult();

		uasort( $this->everything, array( 'Title', 'compare' ) );
		if ( !is_null( $this->params['continue'] ) )
		{
			// Throw away any titles we're gonna skip so they don't
			// clutter queries
			$cont = explode( '|', $this->params['continue'] );
			if ( count( $cont ) != 2 )
				$this->dieUsage( "Invalid continue param. You should pass the original " .
						"value returned by the previous query", "_badcontinue" );
			$conttitle = Title::makeTitleSafe( $cont[0], $cont[1] );
			foreach ( $this->everything as $pageid => $title )
			{
				if ( Title::compare( $title, $conttitle ) >= 0 )
					break;
				unset( $this->titles[$pageid] );
				unset( $this->missing[$pageid] );
				unset( $this->everything[$pageid] );
			}
		}

		$this->pageRestrictions = $pageSet->getCustomField( 'page_restrictions' );
		$this->pageIsRedir = $pageSet->getCustomField( 'page_is_redirect' );
		$this->pageIsNew = $pageSet->getCustomField( 'page_is_new' );
		$this->pageCounter = $pageSet->getCustomField( 'page_counter' );
		$this->pageTouched = $pageSet->getCustomField( 'page_touched' );
		$this->pageLatest = $pageSet->getCustomField( 'page_latest' );
		$this->pageLength = $pageSet->getCustomField( 'page_len' );

		$db = $this->getDB();
		// Get protection info if requested
		if ( $this->fld_protection )
			$this->getProtectionInfo();

		if ( $this->fld_watched )
			$this->getWatchedInfo();

		// Run the talkid/subjectid query if requested
		if ( $this->fld_talkid || $this->fld_subjectid )
			$this->getTSIDs();

		foreach ( $this->everything as $pageid => $title ) {
			$pageInfo = $this->extractPageInfo( $pageid, $title );
			$fit = $result->addValue( array (
				'query',
				'pages'
			), $pageid, $pageInfo );
			if ( !$fit )
			{
				$this->setContinueEnumParameter( 'continue',
						$title->getNamespace() . '|' .
						$title->getText() );
				break;
			}
		}
	}

	/**
	 * Get a result array with information about a title
	 * @param $pageid int Page ID (negative for missing titles)
	 * @param $title Title object
	 * @return array
	 */
	private function extractPageInfo( $pageid, $title )
	{
		$pageInfo = array();
		if ( $title->exists() )
		{
			$pageInfo['touched'] = wfTimestamp( TS_ISO_8601, $this->pageTouched[$pageid] );
			$pageInfo['lastrevid'] = intval( $this->pageLatest[$pageid] );
			$pageInfo['counter'] = intval( $this->pageCounter[$pageid] );
			$pageInfo['length'] = intval( $this->pageLength[$pageid] );
			if ( $this->pageIsRedir[$pageid] )
				$pageInfo['redirect'] = '';
			if ( $this->pageIsNew[$pageid] )
				$pageInfo['new'] = '';
		}

		if ( !is_null( $this->params['token'] ) ) {
			$tokenFunctions = $this->getTokenFunctions();
			$pageInfo['starttimestamp'] = wfTimestamp( TS_ISO_8601, time() );
			foreach ( $this->params['token'] as $t )
			{
				$val = call_user_func( $tokenFunctions[$t], $pageid, $title );
				if ( $val === false )
					$this->setWarning( "Action '$t' is not allowed for the current user" );
				else
					$pageInfo[$t . 'token'] = $val;
			}
		}

		if ( $this->fld_protection ) {
			$pageInfo['protection'] = array();
			if ( isset( $this->protections[$title->getNamespace()][$title->getDBkey()] ) )
				$pageInfo['protection'] =
					$this->protections[$title->getNamespace()][$title->getDBkey()];
			$this->getResult()->setIndexedTagName( $pageInfo['protection'], 'pr' );
		}

		if ( $this->fld_watched && isset( $this->watched[$title->getNamespace()][$title->getDBkey()] ) )
			$pageInfo['watched'] = '';
	
		if ( $this->fld_talkid && isset( $this->talkids[$title->getNamespace()][$title->getDBkey()] ) )
			$pageInfo['talkid'] = $this->talkids[$title->getNamespace()][$title->getDBkey()];

		if ( $this->fld_subjectid && isset( $this->subjectids[$title->getNamespace()][$title->getDBkey()] ) )
			$pageInfo['subjectid'] = $this->subjectids[$title->getNamespace()][$title->getDBkey()];

		if ( $this->fld_url ) {
			$pageInfo['fullurl'] = $title->getFullURL();
			$pageInfo['editurl'] = $title->getFullURL( 'action=edit' );
		}
		if ( $this->fld_readable && $title->userCanRead() )
			$pageInfo['readable'] = '';
			
		if ( $this->fld_preload ) {
			if ( $title->exists() )
				$pageInfo['preload'] = '';
			else {
				wfRunHooks( 'EditFormPreloadText', array( &$text, &$title ) );
			
				$pageInfo['preload'] = $text;
			}
		}
		return $pageInfo;
	}

	/**
	 * Get information about protections and put it in $protections
	 */
	private function getProtectionInfo()
	{
		$this->protections = array();
		$db = $this->getDB();

		// Get normal protections for existing titles
		if ( count( $this->titles ) )
		{
			$this->resetQueryParams();
			$this->addTables( array( 'page_restrictions', 'page' ) );
			$this->addWhere( 'page_id=pr_page' );
			$this->addFields( array( 'pr_page', 'pr_type', 'pr_level',
					'pr_expiry', 'pr_cascade', 'page_namespace',
					'page_title' ) );
			$this->addWhereFld( 'pr_page', array_keys( $this->titles ) );

			$res = $this->select( __METHOD__ );
			while ( $row = $db->fetchObject( $res ) ) {
				$a = array(
					'type' => $row->pr_type,
					'level' => $row->pr_level,
					'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 )
				);
				if ( $row->pr_cascade )
					$a['cascade'] = '';
				$this->protections[$row->page_namespace][$row->page_title][] = $a;

				// Also check old restrictions
				if ( $this->pageRestrictions[$row->pr_page] ) {
					$restrictions = explode( ':', trim( $this->pageRestrictions[$row->pr_page] ) );
					foreach ( $restrictions as $restrict ) {
						$temp = explode( '=', trim( $restrict ) );
						if ( count( $temp ) == 1 ) {
							// old old format should be treated as edit/move restriction
							$restriction = trim( $temp[0] );

							if ( $restriction == '' )
								continue;
							$this->protections[$row->page_namespace][$row->page_title][] = array(
								'type' => 'edit',
								'level' => $restriction,
								'expiry' => 'infinity',
							);
							$this->protections[$row->page_namespace][$row->page_title][] = array(
								'type' => 'move',
								'level' => $restriction,
								'expiry' => 'infinity',
							);
						} else {
							$restriction = trim( $temp[1] );
							if ( $restriction == '' )
								continue;
							$this->protections[$row->page_namespace][$row->page_title][] = array(
								'type' => $temp[0],
								'level' => $restriction,
								'expiry' => 'infinity',
							);
						}
					}
				}
			}
			$db->freeResult( $res );
		}

		// Get protections for missing titles
		if ( count( $this->missing ) )
		{
			$this->resetQueryParams();
			$lb = new LinkBatch( $this->missing );
			$this->addTables( 'protected_titles' );
			$this->addFields( array( 'pt_title', 'pt_namespace', 'pt_create_perm', 'pt_expiry' ) );
			$this->addWhere( $lb->constructSet( 'pt', $db ) );
			$res = $this->select( __METHOD__ );
			while ( $row = $db->fetchObject( $res ) ) {
				$this->protections[$row->pt_namespace][$row->pt_title][] = array(
					'type' => 'create',
					'level' => $row->pt_create_perm,
					'expiry' => Block::decodeExpiry( $row->pt_expiry, TS_ISO_8601 )
				);
			}
			$db->freeResult( $res );
		}

		// Cascading protections
		$images = $others = array();
		foreach ( $this->everything as $title )
			if ( $title->getNamespace() == NS_FILE )
				$images[] = $title->getDBkey();
			else
				$others[] = $title;

		if ( count( $others ) ) {
			// Non-images: check templatelinks
			$lb = new LinkBatch( $others );
			$this->resetQueryParams();
			$this->addTables( array( 'page_restrictions', 'page', 'templatelinks' ) );
			$this->addFields( array( 'pr_type', 'pr_level', 'pr_expiry',
					'page_title', 'page_namespace',
					'tl_title', 'tl_namespace' ) );
			$this->addWhere( $lb->constructSet( 'tl', $db ) );
			$this->addWhere( 'pr_page = page_id' );
			$this->addWhere( 'pr_page = tl_from' );
			$this->addWhereFld( 'pr_cascade', 1 );

			$res = $this->select( __METHOD__ );
			while ( $row = $db->fetchObject( $res ) ) {
				$source = Title::makeTitle( $row->page_namespace, $row->page_title );
				$this->protections[$row->tl_namespace][$row->tl_title][] = array(
					'type' => $row->pr_type,
					'level' => $row->pr_level,
					'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 ),
					'source' => $source->getPrefixedText()
				);
			}
			$db->freeResult( $res );
		}

		if ( count( $images ) ) {
			// Images: check imagelinks
			$this->resetQueryParams();
			$this->addTables( array( 'page_restrictions', 'page', 'imagelinks' ) );
			$this->addFields( array( 'pr_type', 'pr_level', 'pr_expiry',
					'page_title', 'page_namespace', 'il_to' ) );
			$this->addWhere( 'pr_page = page_id' );
			$this->addWhere( 'pr_page = il_from' );
			$this->addWhereFld( 'pr_cascade', 1 );
			$this->addWhereFld( 'il_to', $images );

			$res = $this->select( __METHOD__ );
			while ( $row = $db->fetchObject( $res ) ) {
				$source = Title::makeTitle( $row->page_namespace, $row->page_title );
				$this->protections[NS_FILE][$row->il_to][] = array(
					'type' => $row->pr_type,
					'level' => $row->pr_level,
					'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 ),
					'source' => $source->getPrefixedText()
				);
			}
			$db->freeResult( $res );
		}
	}

	/**
	 * Get talk page IDs (if requested) and subject page IDs (if requested)
	 * and put them in $talkids and $subjectids 
	 */
	private function getTSIDs()
	{
		$getTitles = $this->talkids = $this->subjectids = array();
		$db = $this->getDB();
		foreach ( $this->everything as $t )
		{
			if ( MWNamespace::isTalk( $t->getNamespace() ) )
			{
				if ( $this->fld_subjectid )
					$getTitles[] = $t->getSubjectPage();
			}
			else if ( $this->fld_talkid )
				$getTitles[] = $t->getTalkPage();
		}
		if ( !count( $getTitles ) )
			return;

		// Construct a custom WHERE clause that matches
		// all titles in $getTitles
		$lb = new LinkBatch( $getTitles );
		$this->resetQueryParams();
		$this->addTables( 'page' );
		$this->addFields( array( 'page_title', 'page_namespace', 'page_id' ) );
		$this->addWhere( $lb->constructSet( 'page', $db ) );
		$res = $this->select( __METHOD__ );
		while ( $row = $db->fetchObject( $res ) )
		{
			if ( MWNamespace::isTalk( $row->page_namespace ) )
				$this->talkids[MWNamespace::getSubject( $row->page_namespace )][$row->page_title] =
						intval( $row->page_id );
			else
				$this->subjectids[MWNamespace::getTalk( $row->page_namespace )][$row->page_title] =
						intval( $row->page_id );
		}
	}

	/**
	 * Get information about watched status and put it in $this->watched
	 */
	private function getWatchedInfo()
	{
		global $wgUser;

		if ( $wgUser->isAnon() || count( $this->titles ) == 0 )
			return;

		$this->watched = array();
		$db = $this->getDB();

		$lb = new LinkBatch( $this->titles );

		$this->resetQueryParams();
		$this->addTables( array( 'page', 'watchlist' ) );
		$this->addFields( array( 'page_title', 'page_namespace' ) );
		$this->addWhere( array(
			$lb->constructSet( 'page', $db ),
			'wl_namespace=page_namespace',
			'wl_title=page_title',
			'wl_user' => $wgUser->getID()
		) );

		$res = $this->select( __METHOD__ );

		while ( $row = $db->fetchObject( $res ) ) {
			$this->watched[$row->page_namespace][$row->page_title] = true;
		}
	}

	public function getCacheMode( $params ) {
		$publicProps = array(
			'protection',
			'talkid',
			'subjectid',
			'url',
			'preload',
		);
		if ( !is_null( $params['prop'] ) ) {
			foreach ( $params['prop'] as $prop ) {
				if ( !in_array( $prop, $publicProps ) ) {
					return 'private';
				}
			}
		}
		if ( !is_null( $params['token'] ) ) {
			return 'private';
		}
		return 'public';
	}

	public function getAllowedParams() {
		return array (
			'prop' => array (
				ApiBase :: PARAM_DFLT => null,
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array (
					'protection',
					'talkid',
					'watched', # private
					'subjectid',
					'url',
					'readable', # private
					'preload'
					// If you add more properties here, please consider whether they 
					// need to be added to getCacheMode()
				) ),
			'token' => array (
				ApiBase :: PARAM_DFLT => null,
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array_keys( $this->getTokenFunctions() )
			),
			'continue' => null,
		);
	}

	public function getParamDescription() {
		return array (
			'prop' => array (
				'Which additional properties to get:',
				' protection   - List the protection level of each page',
				' talkid       - The page ID of the talk page for each non-talk page',
				' watched      - List the watched status of each page',
				' subjectid    - The page ID of the parent page for each talk page',
				' url          - Gives a full URL to the page, and also an edit URL',
				' readable     - Whether the user can read this page',
				' preload      - Gives the text returned by EditFormPreloadText'
			),
			'token' => 'Request a token to perform a data-modifying action on a page',
			'continue' => 'When more results are available, use this to continue',
		);
	}

	public function getDescription() {
		return 'Get basic page information such as namespace, title, last touched date, ...';
	}
	
	public function getPossibleErrors() {
		return array_merge( parent::getPossibleErrors(), array(
			array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
		) );
	}

	protected function getExamples() {
		return array (
			'api.php?action=query&prop=info&titles=Main%20Page',
			'api.php?action=query&prop=info&inprop=protection&titles=Main%20Page'
		);
	}

	public function getVersion() {
		return __CLASS__ . ': $Id: ApiQueryInfo.php 69932 2010-07-26 08:03:21Z tstarling $';
	}
}