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' );
                } else {
                        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( 'inputneeded', 'A title, a page ID, or a revision number is needed for both the from and the to parameters' );
        }

        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',
                );
        }
}