<?php

/*
 * Created on August 16, 2007
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2007 Iker Labarga <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 ( "ApiBase.php" );
}

/**
 * A module that allows for editing and creating pages.
 *
 * Currently, this wraps around the EditPage class in an ugly way,
 * EditPage.php should be rewritten to provide a cleaner interface
 * @ingroup API
 */
class ApiEditPage extends ApiBase {

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

	public function execute() {
		global $wgUser;
		$params = $this->extractRequestParams();
		
		if ( is_null( $params['title'] ) )
			$this->dieUsageMsg( array( 'missingparam', 'title' ) );

		if ( is_null( $params['text'] ) && is_null( $params['appendtext'] ) &&
				is_null( $params['prependtext'] ) &&
				$params['undo'] == 0 )
			$this->dieUsageMsg( array( 'missingtext' ) );

		$titleObj = Title::newFromText( $params['title'] );
		if ( !$titleObj || $titleObj->isExternal() )
			$this->dieUsageMsg( array( 'invalidtitle', $params['title'] ) );
			
		// Some functions depend on $wgTitle == $ep->mTitle
		global $wgTitle;
		$wgTitle = $titleObj;

		if ( $params['createonly'] && $titleObj->exists() )
			$this->dieUsageMsg( array( 'createonly-exists' ) );
		if ( $params['nocreate'] && !$titleObj->exists() )
			$this->dieUsageMsg( array( 'nocreate-missing' ) );

		// Now let's check whether we're even allowed to do this
		$errors = $titleObj->getUserPermissionsErrors( 'edit', $wgUser );
		if ( !$titleObj->exists() )
			$errors = array_merge( $errors, $titleObj->getUserPermissionsErrors( 'create', $wgUser ) );
		if ( count( $errors ) )
			$this->dieUsageMsg( $errors[0] );

		$articleObj = new Article( $titleObj );
		$toMD5 = $params['text'];
		if ( !is_null( $params['appendtext'] ) || !is_null( $params['prependtext'] ) )
		{
			// For non-existent pages, Article::getContent()
			// returns an interface message rather than ''
			// We do want getContent()'s behavior for non-existent
			// MediaWiki: pages, though
			if ( $articleObj->getID() == 0 && $titleObj->getNamespace() != NS_MEDIAWIKI )
				$content = '';
			else
				$content = $articleObj->getContent();
			
			if ( !is_null( $params['section'] ) )
			{
				// Process the content for section edits
				global $wgParser;
				$section = intval( $params['section'] );
				$content = $wgParser->getSection( $content, $section, false );
				if ( $content === false )
					$this->dieUsage( "There is no section {$section}.", 'nosuchsection' );
			}
			$params['text'] = $params['prependtext'] . $content . $params['appendtext'];
			$toMD5 = $params['prependtext'] . $params['appendtext'];
		}
		
		if ( $params['undo'] > 0 )
		{
			if ( $params['undoafter'] > 0 )
			{
				if ( $params['undo'] < $params['undoafter'] )
					list( $params['undo'], $params['undoafter'] ) =
					array( $params['undoafter'], $params['undo'] );
				$undoafterRev = Revision::newFromID( $params['undoafter'] );
			}
			$undoRev = Revision::newFromID( $params['undo'] );
			if ( is_null( $undoRev ) || $undoRev->isDeleted( Revision::DELETED_TEXT ) )
				$this->dieUsageMsg( array( 'nosuchrevid', $params['undo'] ) );

			if ( $params['undoafter'] == 0 )
				$undoafterRev = $undoRev->getPrevious();
			if ( is_null( $undoafterRev ) || $undoafterRev->isDeleted( Revision::DELETED_TEXT ) )
				$this->dieUsageMsg( array( 'nosuchrevid', $params['undoafter'] ) );

			if ( $undoRev->getPage() != $articleObj->getID() )
				$this->dieUsageMsg( array( 'revwrongpage', $undoRev->getID(), $titleObj->getPrefixedText() ) );
			if ( $undoafterRev->getPage() != $articleObj->getID() )
				$this->dieUsageMsg( array( 'revwrongpage', $undoafterRev->getID(), $titleObj->getPrefixedText() ) );
				
			$newtext = $articleObj->getUndoText( $undoRev, $undoafterRev );
			if ( $newtext === false )
				$this->dieUsageMsg( array( 'undo-failure' ) );
			$params['text'] = $newtext;
			// If no summary was given and we only undid one rev,
			// use an autosummary
			if ( is_null( $params['summary'] ) && $titleObj->getNextRevisionID( $undoafterRev->getID() ) == $params['undo'] )
				$params['summary'] = wfMsgForContent( 'undo-summary', $params['undo'], $undoRev->getUserText() );
		}

		// See if the MD5 hash checks out
		if ( !is_null( $params['md5'] ) && md5( $toMD5 ) !== $params['md5'] )
			$this->dieUsageMsg( array( 'hashcheckfailed' ) );
		
		$ep = new EditPage( $articleObj );
		// EditPage wants to parse its stuff from a WebRequest
		// That interface kind of sucks, but it's workable
		$reqArr = array( 'wpTextbox1' => $params['text'],
				'wpEditToken' => $params['token'],
				'wpIgnoreBlankSummary' => ''
		);

		if ( !is_null( $params['summary'] ) )
			$reqArr['wpSummary'] = $params['summary'];

		// Watch out for basetimestamp == ''
		// wfTimestamp() treats it as NOW, almost certainly causing an edit conflict
		if ( !is_null( $params['basetimestamp'] ) && $params['basetimestamp'] != '' )
			$reqArr['wpEdittime'] = wfTimestamp( TS_MW, $params['basetimestamp'] );
		else
			$reqArr['wpEdittime'] = $articleObj->getTimestamp();

		if ( !is_null( $params['starttimestamp'] ) && $params['starttimestamp'] != '' )
			$reqArr['wpStarttime'] = wfTimestamp( TS_MW, $params['starttimestamp'] );
		else
			$reqArr['wpStarttime'] = $reqArr['wpEdittime'];	// Fake wpStartime

		if ( $params['minor'] || ( !$params['notminor'] && $wgUser->getOption( 'minordefault' ) ) )
			$reqArr['wpMinoredit'] = '';

		if ( $params['recreate'] )
			$reqArr['wpRecreate'] = '';

		if ( !is_null( $params['section'] ) )
		{
			$section = intval( $params['section'] );
			if ( $section == 0 && $params['section'] != '0' && $params['section'] != 'new' )
				$this->dieUsage( "The section parameter must be set to an integer or 'new'", "invalidsection" );
			$reqArr['wpSection'] = $params['section'];
		}
		else
			$reqArr['wpSection'] = '';

		// Handle watchlist settings
		switch ( $params['watchlist'] )
		{
			case 'watch':
				$watch = true;
				break;
			case 'unwatch':
				$watch = false;
				break;
			case 'preferences':
				if ( $titleObj->exists() )
					$watch = $wgUser->getOption( 'watchdefault' ) || $titleObj->userIsWatching();
				else
					$watch = $wgUser->getOption( 'watchcreations' );
				break;
			case 'nochange':
			default:
				$watch = $titleObj->userIsWatching();
		}
		// Deprecated parameters
		if ( $params['watch'] )
			$watch = true;
		elseif ( $params['unwatch'] )
			$watch = false;
		
		if ( $watch )
			$reqArr['wpWatchthis'] = '';

		$req = new FauxRequest( $reqArr, true );
		$ep->importFormData( $req );

		// Run hooks
		// Handle CAPTCHA parameters
		global $wgRequest;
		if ( !is_null( $params['captchaid'] ) )
			$wgRequest->setVal( 'wpCaptchaId', $params['captchaid'] );
		if ( !is_null( $params['captchaword'] ) )
			$wgRequest->setVal( 'wpCaptchaWord', $params['captchaword'] );

		$r = array();
		if ( !wfRunHooks( 'APIEditBeforeSave', array( $ep, $ep->textbox1, &$r ) ) )
		{
			if ( count( $r ) )
			{
				$r['result'] = "Failure";
				$this->getResult()->addValue( null, $this->getModuleName(), $r );
				return;
			}
			else
				$this->dieUsageMsg( array( 'hookaborted' ) );
		}

		// Do the actual save
		$oldRevId = $articleObj->getRevIdFetched();
		$result = null;
		// Fake $wgRequest for some hooks inside EditPage
		// FIXME: This interface SUCKS
		$oldRequest = $wgRequest;
		$wgRequest = $req;

		$retval = $ep->internalAttemptSave( $result, $wgUser->isAllowed( 'bot' ) && $params['bot'] );
		$wgRequest = $oldRequest;
		switch( $retval )
		{
			case EditPage::AS_HOOK_ERROR:
			case EditPage::AS_HOOK_ERROR_EXPECTED:
				$this->dieUsageMsg( array( 'hookaborted' ) );

			case EditPage::AS_IMAGE_REDIRECT_ANON:
				$this->dieUsageMsg( array( 'noimageredirect-anon' ) );

			case EditPage::AS_IMAGE_REDIRECT_LOGGED:
				$this->dieUsageMsg( array( 'noimageredirect-logged' ) );

			case EditPage::AS_SPAM_ERROR:
				$this->dieUsageMsg( array( 'spamdetected', $result['spam'] ) );

			case EditPage::AS_FILTERING:
				$this->dieUsageMsg( array( 'filtered' ) );

			case EditPage::AS_BLOCKED_PAGE_FOR_USER:
				$this->dieUsageMsg( array( 'blockedtext' ) );

			case EditPage::AS_MAX_ARTICLE_SIZE_EXCEEDED:
			case EditPage::AS_CONTENT_TOO_BIG:
				global $wgMaxArticleSize;
				$this->dieUsageMsg( array( 'contenttoobig', $wgMaxArticleSize ) );

			case EditPage::AS_READ_ONLY_PAGE_ANON:
				$this->dieUsageMsg( array( 'noedit-anon' ) );

			case EditPage::AS_READ_ONLY_PAGE_LOGGED:
				$this->dieUsageMsg( array( 'noedit' ) );

			case EditPage::AS_READ_ONLY_PAGE:
				$this->dieReadOnly();

			case EditPage::AS_RATE_LIMITED:
				$this->dieUsageMsg( array( 'actionthrottledtext' ) );

			case EditPage::AS_ARTICLE_WAS_DELETED:
				$this->dieUsageMsg( array( 'wasdeleted' ) );

			case EditPage::AS_NO_CREATE_PERMISSION:
				$this->dieUsageMsg( array( 'nocreate-loggedin' ) );

			case EditPage::AS_BLANK_ARTICLE:
				$this->dieUsageMsg( array( 'blankpage' ) );

			case EditPage::AS_CONFLICT_DETECTED:
				$this->dieUsageMsg( array( 'editconflict' ) );

			// case EditPage::AS_SUMMARY_NEEDED: Can't happen since we set wpIgnoreBlankSummary
			case EditPage::AS_TEXTBOX_EMPTY:
				$this->dieUsageMsg( array( 'emptynewsection' ) );

			case EditPage::AS_SUCCESS_NEW_ARTICLE:
				$r['new'] = '';
			case EditPage::AS_SUCCESS_UPDATE:
				$r['result'] = "Success";
				$r['pageid'] = intval( $titleObj->getArticleID() );
				$r['title'] = $titleObj->getPrefixedText();
				// HACK: We create a new Article object here because getRevIdFetched()
				// refuses to be run twice, and because Title::getLatestRevId()
				// won't fetch from the master unless we select for update, which we
				// don't want to do.
				$newArticle = new Article( $titleObj );
				$newRevId = $newArticle->getRevIdFetched();
				if ( $newRevId == $oldRevId )
					$r['nochange'] = '';
				else
				{
					$r['oldrevid'] = intval( $oldRevId );
					$r['newrevid'] = intval( $newRevId );
					$r['newtimestamp'] = wfTimestamp( TS_ISO_8601,
						$newArticle->getTimestamp() );
				}
				break;

			case EditPage::AS_END:
				// This usually means some kind of race condition
				// or DB weirdness occurred. Fall through to throw an unknown 
				// error.

				// This needs fixing higher up, as Article::doEdit should be 
				// used rather than Article::updateArticle, so that specific
				// error conditions can be returned
			default:
				$this->dieUsageMsg( array( 'unknownerror', $retval ) );
		}
		$this->getResult()->addValue( null, $this->getModuleName(), $r );
	}

	public function mustBePosted() {
		return true;
	}

	public function isWriteMode() {
		return true;
	}

	protected function getDescription() {
		return 'Create and edit pages.';
	}
	
	public function getPossibleErrors() {
		global $wgMaxArticleSize;
	
		return array_merge( parent::getPossibleErrors(), array(
			array( 'missingparam', 'title' ),
			array( 'missingtext' ),
			array( 'invalidtitle', 'title' ),
			array( 'createonly-exists' ),
			array( 'nocreate-missing' ),
			array( 'nosuchrevid', 'undo' ),
			array( 'nosuchrevid', 'undoafter' ),
			array( 'revwrongpage', 'id', 'text' ),
			array( 'undo-failure' ),
			array( 'hashcheckfailed' ),
			array( 'hookaborted' ),
			array( 'noimageredirect-anon' ),
			array( 'noimageredirect-logged' ),
			array( 'spamdetected', 'spam' ),
			array( 'filtered' ),
			array( 'blockedtext' ),
			array( 'contenttoobig', $wgMaxArticleSize ),
			array( 'noedit-anon' ),
			array( 'noedit' ),
			array( 'actionthrottledtext' ),
			array( 'wasdeleted' ),
			array( 'nocreate-loggedin' ),
			array( 'blankpage' ),
			array( 'editconflict' ),
			array( 'emptynewsection' ),
			array( 'unknownerror', 'retval' ),
			array( 'code' => 'nosuchsection', 'info' => 'There is no section section.' ),
			array( 'code' => 'invalidsection', 'info' => 'The section parameter must be set to an integer or \'new\'' ),
		) );
	}

	protected function getAllowedParams() {
		return array (
			'title' => null,
			'section' => null,
			'text' => null,
			'token' => null,
			'summary' => null,
			'minor' => false,
			'notminor' => false,
			'bot' => false,
			'basetimestamp' => null,
			'starttimestamp' => null,
			'recreate' => false,
			'createonly' => false,
			'nocreate' => false,
			'captchaword' => null,
			'captchaid' => null,
			'watch' => array(
				ApiBase :: PARAM_DFLT => false,
				ApiBase :: PARAM_DEPRECATED => true,
			),
			'unwatch' => array(
				ApiBase :: PARAM_DFLT => false,
				ApiBase :: PARAM_DEPRECATED => true,
			),
			'watchlist' => array(
				ApiBase :: PARAM_DFLT => 'preferences',
				ApiBase :: PARAM_TYPE => array(
					'watch',
					'unwatch',
					'preferences',
					'nochange'
				),
			),
			'md5' => null,
			'prependtext' => null,
			'appendtext' => null,
			'undo' => array(
				ApiBase :: PARAM_TYPE => 'integer'
			),
			'undoafter' => array(
				ApiBase :: PARAM_TYPE => 'integer'
			),
		);
	}

	protected function getParamDescription() {
		return array (
			'title' => 'Page title',
			'section' => 'Section number. 0 for the top section, \'new\' for a new section',
			'text' => 'Page content',
			'token' => 'Edit token. You can get one of these through prop=info',
			'summary' => 'Edit summary. Also section title when section=new',
			'minor' => 'Minor edit',
			'notminor' => 'Non-minor edit',
			'bot' => 'Mark this edit as bot',
			'basetimestamp' => array( 'Timestamp of the base revision (gotten through prop=revisions&rvprop=timestamp).',
						'Used to detect edit conflicts; leave unset to ignore conflicts.'
			),
			'starttimestamp' => array( 'Timestamp when you obtained the edit token.',
						'Used to detect edit conflicts; leave unset to ignore conflicts.'
			),
			'recreate' => 'Override any errors about the article having been deleted in the meantime',
			'createonly' => 'Don\'t edit the page if it exists already',
			'nocreate' => 'Throw an error if the page doesn\'t exist',
			'watch' => 'Add the page to your watchlist',
			'unwatch' => 'Remove the page from your watchlist',
			'watchlist' => 'Unconditionally add or remove the page from your watchlist, use preferences or do not change watch',
			'captchaid' => 'CAPTCHA ID from previous request',
			'captchaword' => 'Answer to the CAPTCHA',
			'md5' => array(	'The MD5 hash of the text parameter, or the prependtext and appendtext parameters concatenated.',
				 	'If set, the edit won\'t be done unless the hash is correct' ),
			'prependtext' => 'Add this text to the beginning of the page. Overrides text.',
			'appendtext' => 'Add this text to the end of the page. Overrides text',
			'undo' => 'Undo this revision. Overrides text, prependtext and appendtext',
			'undoafter' => 'Undo all revisions from undo to this one. If not set, just undo one revision',
		);
	}
	
	public function needsToken() {
		return true;
	}

	public function getTokenSalt() {
		return '';
	}

	protected function getExamples() {
		return array (
			"Edit a page (anonymous user):",
			"    api.php?action=edit&title=Test&summary=test%20summary&text=article%20content&basetimestamp=20070824123454&token=%2B\\",
			"Prepend __NOTOC__ to a page (anonymous user):",
			"    api.php?action=edit&title=Test&summary=NOTOC&minor&prependtext=__NOTOC__%0A&basetimestamp=20070824123454&token=%2B\\",
			"Undo r13579 through r13585 with autosummary(anonymous user):",
			"    api.php?action=edit&title=Test&undo=13585&undoafter=13579&basetimestamp=20070824123454&token=%2B\\",
		);
	}

	public function getVersion() {
		return __CLASS__ . ': $Id: ApiEditPage.php 74217 2010-10-03 15:53:07Z reedy $';
	}
}