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 = [];
        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::setContentValue( $vals, 'body', $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( [ 'invalidtitle', $titleText ] );
            }

            return $title->getLatestRevID();
        } elseif ( $titleId ) {
            $title = Title::newFromID( $titleId );
            if ( !$title ) {
                $this->dieUsageMsg( [ '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 [
            'fromtitle' => null,
            'fromid' => [
                ApiBase::PARAM_TYPE => 'integer'
            ],
            'fromrev' => [
                ApiBase::PARAM_TYPE => 'integer'
            ],
            'totitle' => null,
            'toid' => [
                ApiBase::PARAM_TYPE => 'integer'
            ],
            'torev' => [
                ApiBase::PARAM_TYPE => 'integer'
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=compare&fromrev=1&torev=2'
                => 'apihelp-compare-example-1',
        ];
    }
}