ApiQueryDuplicateFiles.php

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<?php
class ApiQueryDuplicateFiles extends ApiQueryGeneratorBase {
 
    private $repoGroup;
 
    public function __construct(
        ApiQuery $query,
        $moduleName,
        RepoGroup $repoGroup
    ) {
        parent::__construct( $query, $moduleName, 'df' );
        $this->repoGroup = $repoGroup;
    }
 
    public function execute() {
        $this->run();
    }
 
    public function getCacheMode( $params ) {
        return 'public';
    }
 
    public function executeGenerator( $resultPageSet ) {
        $this->run( $resultPageSet );
    }
 
    private function run( $resultPageSet = null ) {
        $params = $this->extractRequestParams();
        $namespaces = $this->getPageSet()->getGoodAndMissingTitlesByNamespace();
        if ( empty( $namespaces[NS_FILE] ) ) {
            return;
        }
        $images = $namespaces[NS_FILE];
 
        if ( $params['dir'] == 'descending' ) {
            $images = array_reverse( $images );
        }
 
        $skipUntilThisDup = false;
        if ( isset( $params['continue'] ) ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 2 );
            $fromImage = $cont[0];
            $skipUntilThisDup = $cont[1];
            // Filter out any images before $fromImage
            foreach ( $images as $image => $pageId ) {
                if ( $image < $fromImage ) {
                    unset( $images[$image] );
                } else {
                    break;
                }
            }
        }
 
        $filesToFind = array_keys( $images );
        if ( $params['localonly'] ) {
            $files = $this->repoGroup->getLocalRepo()->findFiles( $filesToFind );
        } else {
            $files = $this->repoGroup->findFiles( $filesToFind );
        }
 
        $fit = true;
        $count = 0;
        $titles = [];
 
        $sha1s = [];
        foreach ( $files as $file ) {
            $sha1s[$file->getName()] = $file->getSha1();
        }
 
        // find all files with the hashes, result format is:
        // [ hash => [ dup1, dup2 ], hash1 => ... ]
        $filesToFindBySha1s = array_unique( array_values( $sha1s ) );
        if ( $params['localonly'] ) {
            $filesBySha1s = $this->repoGroup->getLocalRepo()->findBySha1s( $filesToFindBySha1s );
        } else {
            $filesBySha1s = $this->repoGroup->findBySha1s( $filesToFindBySha1s );
        }
 
        // iterate over $images to handle continue param correct
        foreach ( $images as $image => $pageId ) {
            if ( !isset( $sha1s[$image] ) ) {
                continue; // file does not exist
            }
            $sha1 = $sha1s[$image];
            $dupFiles = $filesBySha1s[$sha1];
            if ( $params['dir'] == 'descending' ) {
                $dupFiles = array_reverse( $dupFiles );
            }
            foreach ( $dupFiles as $dupFile ) {
                $dupName = $dupFile->getName();
                if ( $image == $dupName && $dupFile->isLocal() ) {
                    continue; // ignore the local file itself
                }
                if ( $skipUntilThisDup !== false && $dupName < $skipUntilThisDup ) {
                    continue; // skip to pos after the image from continue param
                }
                $skipUntilThisDup = false;
                if ( ++$count > $params['limit'] ) {
                    $fit = false; // break outer loop
                    // We're one over limit which shows that
                    // there are additional images to be had. Stop here...
                    $this->setContinueEnumParameter( 'continue', $image . '|' . $dupName );
                    break;
                }
                if ( $resultPageSet !== null ) {
                    $titles[] = $dupFile->getTitle();
                } else {
                    $r = [
                        'name' => $dupName,
                        'timestamp' => wfTimestamp( TS_ISO_8601, $dupFile->getTimestamp() ),
                        'shared' => !$dupFile->isLocal(),
                    ];
                    $uploader = $dupFile->getUploader( File::FOR_PUBLIC );
                    if ( $uploader ) {
                        $r['user'] = $uploader->getName();
                    }
                    $fit = $this->addPageSubItem( $pageId, $r );
                    if ( !$fit ) {
                        $this->setContinueEnumParameter( 'continue', $image . '|' . $dupName );
                        break;
                    }
                }
            }
            if ( !$fit ) {
                break;
            }
        }
        if ( $resultPageSet !== null ) {
            $resultPageSet->populateFromTitles( $titles );
        }
    }
 
    public function getAllowedParams() {
        return [
            'limit' => [
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'dir' => [
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
            'localonly' => false,
        ];
    }
 
    protected function getExamplesMessages() {
        return [
            'action=query&titles=File:Albert_Einstein_Head.jpg&prop=duplicatefiles'
                => 'apihelp-query+duplicatefiles-example-simple',
            'action=query&generator=allimages&prop=duplicatefiles'
                => 'apihelp-query+duplicatefiles-example-generated',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Duplicatefiles';
    }
}