ApiQueryAllImages.php

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<?php

class ApiQueryAllImages extends ApiQueryGeneratorBase {
    protected $mRepo;

    public function __construct( $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'ai' );
        $this->mRepo = RepoGroup::singleton()->getLocalRepo();
    }

    protected function getDB() {
        return $this->mRepo->getSlaveDB();
    }

    public function execute() {
        $this->run();
    }

    public function getCacheMode( $params ) {
        return 'public';
    }

    public function executeGenerator( $resultPageSet ) {
        if ( $resultPageSet->isResolvingRedirects() ) {
            $this->dieUsage(
                'Use "gaifilterredir=nonredirects" option instead of "redirects" ' .
                    'when using allimages as a generator',
                'params'
            );
        }

        $this->run( $resultPageSet );
    }

    private function run( $resultPageSet = null ) {
        $repo = $this->mRepo;
        if ( !$repo instanceof LocalRepo ) {
            $this->dieUsage(
                'Local file repository does not support querying all images',
                'unsupportedrepo'
            );
        }

        $prefix = $this->getModulePrefix();

        $db = $this->getDB();

        $params = $this->extractRequestParams();

        // Table and return fields
        $this->addTables( 'image' );

        $prop = array_flip( $params['prop'] );
        $this->addFields( LocalFile::selectFields() );

        $ascendingOrder = true;
        if ( $params['dir'] == 'descending' || $params['dir'] == 'older' ) {
            $ascendingOrder = false;
        }

        if ( $params['sort'] == 'name' ) {
            // Check mutually exclusive params
            $disallowed = array( 'start', 'end', 'user' );
            foreach ( $disallowed as $pname ) {
                if ( isset( $params[$pname] ) ) {
                    $this->dieUsage(
                        "Parameter '{$prefix}{$pname}' can only be used with {$prefix}sort=timestamp",
                        'badparams'
                    );
                }
            }
            if ( $params['filterbots'] != 'all' ) {
                $this->dieUsage(
                    "Parameter '{$prefix}filterbots' can only be used with {$prefix}sort=timestamp",
                    'badparams'
                );
            }

            // Pagination
            if ( !is_null( $params['continue'] ) ) {
                $cont = explode( '|', $params['continue'] );
                $this->dieContinueUsageIf( count( $cont ) != 1 );
                $op = ( $ascendingOrder ? '>' : '<' );
                $continueFrom = $db->addQuotes( $cont[0] );
                $this->addWhere( "img_name $op= $continueFrom" );
            }

            // Image filters
            $from = ( $params['from'] === null ? null : $this->titlePartToKey( $params['from'], NS_FILE ) );
            $to = ( $params['to'] === null ? null : $this->titlePartToKey( $params['to'], NS_FILE ) );
            $this->addWhereRange( 'img_name', ( $ascendingOrder ? 'newer' : 'older' ), $from, $to );

            if ( isset( $params['prefix'] ) ) {
                $this->addWhere( 'img_name' . $db->buildLike(
                    $this->titlePartToKey( $params['prefix'], NS_FILE ),
                    $db->anyString() ) );
            }
        } else {
            // Check mutually exclusive params
            $disallowed = array( 'from', 'to', 'prefix' );
            foreach ( $disallowed as $pname ) {
                if ( isset( $params[$pname] ) ) {
                    $this->dieUsage(
                        "Parameter '{$prefix}{$pname}' can only be used with {$prefix}sort=name",
                        'badparams'
                    );
                }
            }
            if ( !is_null( $params['user'] ) && $params['filterbots'] != 'all' ) {
                // Since filterbots checks if each user has the bot right, it
                // doesn't make sense to use it with user
                $this->dieUsage(
                    "Parameters '{$prefix}user' and '{$prefix}filterbots' cannot be used together",
                    'badparams'
                );
            }

            // Pagination
            $this->addTimestampWhereRange(
                'img_timestamp',
                $ascendingOrder ? 'newer' : 'older',
                $params['start'],
                $params['end']
            );
            // Include in ORDER BY for uniqueness
            $this->addWhereRange( 'img_name', $ascendingOrder ? 'newer' : 'older', null, null );

            if ( !is_null( $params['continue'] ) ) {
                $cont = explode( '|', $params['continue'] );
                $this->dieContinueUsageIf( count( $cont ) != 2 );
                $op = ( $ascendingOrder ? '>' : '<' );
                $continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
                $continueName = $db->addQuotes( $cont[1] );
                $this->addWhere( "img_timestamp $op $continueTimestamp OR " .
                    "(img_timestamp = $continueTimestamp AND " .
                    "img_name $op= $continueName)"
                );
            }

            // Image filters
            if ( !is_null( $params['user'] ) ) {
                $this->addWhereFld( 'img_user_text', $params['user'] );
            }
            if ( $params['filterbots'] != 'all' ) {
                $this->addTables( 'user_groups' );
                $this->addJoinConds( array( 'user_groups' => array(
                    'LEFT JOIN',
                    array(
                        'ug_group' => User::getGroupsWithPermission( 'bot' ),
                        'ug_user = img_user'
                    )
                ) ) );
                $groupCond = ( $params['filterbots'] == 'nobots' ? 'NULL' : 'NOT NULL' );
                $this->addWhere( "ug_group IS $groupCond" );
            }
        }

        // Filters not depending on sort
        if ( isset( $params['minsize'] ) ) {
            $this->addWhere( 'img_size>=' . intval( $params['minsize'] ) );
        }

        if ( isset( $params['maxsize'] ) ) {
            $this->addWhere( 'img_size<=' . intval( $params['maxsize'] ) );
        }

        $sha1 = false;
        if ( isset( $params['sha1'] ) ) {
            $sha1 = strtolower( $params['sha1'] );
            if ( !$this->validateSha1Hash( $sha1 ) ) {
                $this->dieUsage( 'The SHA1 hash provided is not valid', 'invalidsha1hash' );
            }
            $sha1 = wfBaseConvert( $sha1, 16, 36, 31 );
        } elseif ( isset( $params['sha1base36'] ) ) {
            $sha1 = strtolower( $params['sha1base36'] );
            if ( !$this->validateSha1Base36Hash( $sha1 ) ) {
                $this->dieUsage( 'The SHA1Base36 hash provided is not valid', 'invalidsha1base36hash' );
            }
        }
        if ( $sha1 ) {
            $this->addWhereFld( 'img_sha1', $sha1 );
        }

        if ( !is_null( $params['mime'] ) ) {
            global $wgMiserMode;
            if ( $wgMiserMode ) {
                $this->dieUsage( 'MIME search disabled in Miser Mode', 'mimesearchdisabled' );
            }

            list( $major, $minor ) = File::splitMime( $params['mime'] );

            $this->addWhereFld( 'img_major_mime', $major );
            $this->addWhereFld( 'img_minor_mime', $minor );
        }

        $limit = $params['limit'];
        $this->addOption( 'LIMIT', $limit + 1 );
        $sortFlag = '';
        if ( !$ascendingOrder ) {
            $sortFlag = ' DESC';
        }
        if ( $params['sort'] == 'timestamp' ) {
            $this->addOption( 'ORDER BY', 'img_timestamp' . $sortFlag );
            if ( !is_null( $params['user'] ) ) {
                $this->addOption( 'USE INDEX', array( 'image' => 'img_usertext_timestamp' ) );
            } else {
                $this->addOption( 'USE INDEX', array( 'image' => 'img_timestamp' ) );
            }
        } else {
            $this->addOption( 'ORDER BY', 'img_name' . $sortFlag );
        }

        $res = $this->select( __METHOD__ );

        $titles = array();
        $count = 0;
        $result = $this->getResult();
        foreach ( $res as $row ) {
            if ( ++$count > $limit ) {
                // We've reached the one extra which shows that there are
                // additional pages to be had. Stop here...
                if ( $params['sort'] == 'name' ) {
                    $this->setContinueEnumParameter( 'continue', $row->img_name );
                } else {
                    $this->setContinueEnumParameter( 'continue', "$row->img_timestamp|$row->img_name" );
                }
                break;
            }

            if ( is_null( $resultPageSet ) ) {
                $file = $repo->newFileFromRow( $row );
                $info = array_merge( array( 'name' => $row->img_name ),
                    ApiQueryImageInfo::getInfo( $file, $prop, $result ) );
                self::addTitleInfo( $info, $file->getTitle() );

                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $info );
                if ( !$fit ) {
                    if ( $params['sort'] == 'name' ) {
                        $this->setContinueEnumParameter( 'continue', $row->img_name );
                    } else {
                        $this->setContinueEnumParameter( 'continue', "$row->img_timestamp|$row->img_name" );
                    }
                    break;
                }
            } else {
                $titles[] = Title::makeTitle( NS_FILE, $row->img_name );
            }
        }

        if ( is_null( $resultPageSet ) ) {
            $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'img' );
        } else {
            $resultPageSet->populateFromTitles( $titles );
        }
    }

    public function getAllowedParams() {
        return array(
            'sort' => array(
                ApiBase::PARAM_DFLT => 'name',
                ApiBase::PARAM_TYPE => array(
                    'name',
                    'timestamp'
                )
            ),
            'dir' => array(
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => array(
                    // sort=name
                    'ascending',
                    'descending',
                    // sort=timestamp
                    'newer',
                    'older'
                )
            ),
            'from' => null,
            'to' => null,
            'continue' => null,
            'start' => array(
                ApiBase::PARAM_TYPE => 'timestamp'
            ),
            'end' => array(
                ApiBase::PARAM_TYPE => 'timestamp'
            ),
            'prop' => array(
                ApiBase::PARAM_TYPE => ApiQueryImageInfo::getPropertyNames( $this->propertyFilter ),
                ApiBase::PARAM_DFLT => 'timestamp|url',
                ApiBase::PARAM_ISMULTI => true
            ),
            'prefix' => null,
            'minsize' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'maxsize' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'sha1' => null,
            'sha1base36' => null,
            'user' => array(
                ApiBase::PARAM_TYPE => 'user'
            ),
            'filterbots' => array(
                ApiBase::PARAM_DFLT => 'all',
                ApiBase::PARAM_TYPE => array(
                    'all',
                    'bots',
                    'nobots'
                )
            ),
            'mime' => null,
            'limit' => array(
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ),
        );
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();

        return array(
            'sort' => 'Property to sort by',
            'dir' => 'The direction in which to list',
            'from' => "The image title to start enumerating from. Can only be used with {$p}sort=name",
            'to' => "The image title to stop enumerating at. Can only be used with {$p}sort=name",
            'continue' => 'When more results are available, use this to continue',
            'start' => "The timestamp to start enumerating from. Can only be used with {$p}sort=timestamp",
            'end' => "The timestamp to end enumerating. Can only be used with {$p}sort=timestamp",
            'prop' => ApiQueryImageInfo::getPropertyDescriptions( $this->propertyFilter ),
            'prefix' => "Search for all image titles that begin with this " .
                "value. Can only be used with {$p}sort=name",
            'minsize' => 'Limit to images with at least this many bytes',
            'maxsize' => 'Limit to images with at most this many bytes',
            'sha1' => "SHA1 hash of image. Overrides {$p}sha1base36",
            'sha1base36' => 'SHA1 hash of image in base 36 (used in MediaWiki)',
            'user' => "Only return files uploaded by this user. Can only be used " .
                "with {$p}sort=timestamp. Cannot be used together with {$p}filterbots",
            'filterbots' => "How to filter files uploaded by bots. Can only be " .
                "used with {$p}sort=timestamp. Cannot be used together with {$p}user",
            'mime' => 'What MIME type to search for. e.g. image/jpeg. Disabled in Miser Mode',
            'limit' => 'How many images in total to return',
        );
    }

    private $propertyFilter = array( 'archivename', 'thumbmime', 'uploadwarning' );

    public function getResultProperties() {
        return array_merge(
            array(
                '' => array(
                    'name' => 'string',
                    'ns' => 'namespace',
                    'title' => 'string'
                )
            ),
            ApiQueryImageInfo::getResultPropertiesFiltered( $this->propertyFilter )
        );
    }

    public function getDescription() {
        return 'Enumerate all images sequentially.';
    }

    public function getPossibleErrors() {
        $p = $this->getModulePrefix();

        return array_merge( parent::getPossibleErrors(), array(
            array(
                'code' => 'params',
                'info' => 'Use "gaifilterredir=nonredirects" option instead ' .
                    'of "redirects" when using allimages as a generator'
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}start' can only be used with {$p}sort=timestamp"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}end' can only be used with {$p}sort=timestamp"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}user' can only be used with {$p}sort=timestamp"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}filterbots' can only be used with {$p}sort=timestamp"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}from' can only be used with {$p}sort=name"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}to' can only be used with {$p}sort=name"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameter'{$p}prefix' can only be used with {$p}sort=name"
            ),
            array(
                'code' => 'badparams',
                'info' => "Parameters '{$p}user' and '{$p}filterbots' cannot be used together"
            ),
            array(
                'code' => 'unsupportedrepo',
                'info' => 'Local file repository does not support querying all images' ),
            array( 'code' => 'mimesearchdisabled', 'info' => 'MIME search disabled in Miser Mode' ),
            array( 'code' => 'invalidsha1hash', 'info' => 'The SHA1 hash provided is not valid' ),
            array(
                'code' => 'invalidsha1base36hash',
                'info' => 'The SHA1Base36 hash provided is not valid'
            ),
        ) );
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=allimages&aifrom=B' => array(
                'Simple Use',
                'Show a list of files starting at the letter "B"',
            ),
            'api.php?action=query&list=allimages&aiprop=user|timestamp|url&' .
                'aisort=timestamp&aidir=older' => array(
                'Simple Use',
                'Show a list of recently uploaded files similar to Special:NewFiles',
            ),
            'api.php?action=query&generator=allimages&gailimit=4&' .
                'gaifrom=T&prop=imageinfo' => array(
                'Using as Generator',
                'Show info about 4 files starting at the letter "T"',
            ),
        );
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Allimages';
    }
}