ApiComparePages.php

Go to the documentation of this file.

<?php
class ApiComparePages extends ApiBase {
 
    public function execute() {
        $params = $this->extractRequestParams();
 
        $rev1 = $this->revisionOrTitleOrId( $params['fromrev'], $params['fromtitle'], $params['fromid'] );
        $rev2 = $this->revisionOrTitleOrId( $params['torev'], $params['totitle'], $params['toid'] );
 
        $revision = Revision::newFromId( $rev1 );
 
        if ( !$revision ) {
            $this->dieUsage( 'The diff cannot be retrieved, ' .
                'one revision does not exist or you do not have permission to view it.', 'baddiff' );
        }
 
        $contentHandler = $revision->getContentHandler();
        $de = $contentHandler->createDifferenceEngine( $this->getContext(),
            $rev1,
            $rev2,
            null, // rcid
            true,
            false );
 
        $vals = array();
        if ( isset( $params['fromtitle'] ) ) {
            $vals['fromtitle'] = $params['fromtitle'];
        }
        if ( isset( $params['fromid'] ) ) {
            $vals['fromid'] = $params['fromid'];
        }
        $vals['fromrevid'] = $rev1;
        if ( isset( $params['totitle'] ) ) {
            $vals['totitle'] = $params['totitle'];
        }
        if ( isset( $params['toid'] ) ) {
            $vals['toid'] = $params['toid'];
        }
        $vals['torevid'] = $rev2;
 
        $difftext = $de->getDiffBody();
 
        if ( $difftext === false ) {
            $this->dieUsage(
                'The diff cannot be retrieved. Maybe one or both revisions do ' .
                    'not exist or you do not have permission to view them.',
                'baddiff'
            );
        }
 
        ApiResult::setContent( $vals, $difftext );
 
        $this->getResult()->addValue( null, $this->getModuleName(), $vals );
    }
 
    private function revisionOrTitleOrId( $revision, $titleText, $titleId ) {
        if ( $revision ) {
            return $revision;
        } elseif ( $titleText ) {
            $title = Title::newFromText( $titleText );
            if ( !$title || $title->isExternal() ) {
                $this->dieUsageMsg( array( 'invalidtitle', $titleText ) );
            }
 
            return $title->getLatestRevID();
        } elseif ( $titleId ) {
            $title = Title::newFromID( $titleId );
            if ( !$title ) {
                $this->dieUsageMsg( array( 'nosuchpageid', $titleId ) );
            }
 
            return $title->getLatestRevID();
        }
        $this->dieUsage(
            'A title, a page ID, or a revision number is needed for both the from and the to parameters',
            'inputneeded'
        );
    }
 
    public function getAllowedParams() {
        return array(
            'fromtitle' => null,
            'fromid' => array(
                ApiBase::PARAM_TYPE => 'integer'
            ),
            'fromrev' => array(
                ApiBase::PARAM_TYPE => 'integer'
            ),
            'totitle' => null,
            'toid' => array(
                ApiBase::PARAM_TYPE => 'integer'
            ),
            'torev' => array(
                ApiBase::PARAM_TYPE => 'integer'
            ),
        );
    }
 
    public function getParamDescription() {
        return array(
            'fromtitle' => 'First title to compare',
            'fromid' => 'First page ID to compare',
            'fromrev' => 'First revision to compare',
            'totitle' => 'Second title to compare',
            'toid' => 'Second page ID to compare',
            'torev' => 'Second revision to compare',
        );
    }
 
    public function getResultProperties() {
        return array(
            '' => array(
                'fromtitle' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                ),
                'fromrevid' => 'integer',
                'totitle' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                ),
                'torevid' => 'integer',
                '*' => 'string'
            )
        );
    }
 
    public function getDescription() {
        return array(
            'Get the difference between 2 pages.',
            'You must pass a revision number or a page title or a page ID id for each part (1 and 2).'
        );
    }
 
    public function getPossibleErrors() {
        return array_merge( parent::getPossibleErrors(), array(
            array( 'code' => 'inputneeded', 'info' => 'A title or a revision is needed' ),
            array( 'invalidtitle', 'title' ),
            array( 'nosuchpageid', 'pageid' ),
            array(
                'code' => 'baddiff',
                'info' => 'The diff cannot be retrieved. Maybe one or both ' .
                    'revisions do not exist or you do not have permission to view them.'
            ),
        ) );
    }
 
    public function getExamples() {
        return array(
            'api.php?action=compare&fromrev=1&torev=2' => 'Create a diff between revision 1 and 2',
        );
    }
}