Merge "DatabaseMssql: Don't duplicate body of makeList()"

[mediawiki.git] / includes / api / ApiQueryImageInfo.php

<?php
/**
 *
 *
 * Created on July 6, 2007
 *
 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * A query action to get image information and upload history.
 *
 * @ingroup API
 */
class ApiQueryImageInfo extends ApiQueryBase {
        const TRANSFORM_LIMIT = 50;
        private static $transformCount = 0;

        public function __construct( ApiQuery $query, $moduleName, $prefix = 'ii' ) {
                // We allow a subclass to override the prefix, to create a related API
                // module. Some other parts of MediaWiki construct this with a null
                // $prefix, which used to be ignored when this only took two arguments
                if ( is_null( $prefix ) ) {
                        $prefix = 'ii';
                }
                parent::__construct( $query, $moduleName, $prefix );
        }

        public function execute() {
                $params = $this->extractRequestParams();

                $prop = array_flip( $params['prop'] );

                $scale = $this->getScale( $params );

                $opts = array(
                        'version' => $params['metadataversion'],
                        'language' => $params['extmetadatalanguage'],
                        'multilang' => $params['extmetadatamultilang'],
                        'extmetadatafilter' => $params['extmetadatafilter'],
                        'revdelUser' => $this->getUser(),
                );

                $pageIds = $this->getPageSet()->getGoodAndMissingTitlesByNamespace();
                if ( !empty( $pageIds[NS_FILE] ) ) {
                        $titles = array_keys( $pageIds[NS_FILE] );
                        asort( $titles ); // Ensure the order is always the same

                        $fromTitle = null;
                        if ( !is_null( $params['continue'] ) ) {
                                $cont = explode( '|', $params['continue'] );
                                $this->dieContinueUsageIf( count( $cont ) != 2 );
                                $fromTitle = strval( $cont[0] );
                                $fromTimestamp = $cont[1];
                                // Filter out any titles before $fromTitle
                                foreach ( $titles as $key => $title ) {
                                        if ( $title < $fromTitle ) {
                                                unset( $titles[$key] );
                                        } else {
                                                break;
                                        }
                                }
                        }

                        $user = $this->getUser();
                        $findTitles = array_map( function ( $title ) use ( $user ) {
                                return array(
                                        'title' => $title,
                                        'private' => $user,
                                );
                        }, $titles );

                        if ( $params['localonly'] ) {
                                $images = RepoGroup::singleton()->getLocalRepo()->findFiles( $findTitles );
                        } else {
                                $images = RepoGroup::singleton()->findFiles( $findTitles );
                        }

                        $result = $this->getResult();
                        foreach ( $titles as $title ) {
                                $pageId = $pageIds[NS_FILE][$title];
                                $start = $title === $fromTitle ? $fromTimestamp : $params['start'];

                                if ( !isset( $images[$title] ) ) {
                                        if ( isset( $prop['uploadwarning'] ) ) {
                                                // Uploadwarning needs info about non-existing files
                                                $images[$title] = wfLocalFile( $title );
                                        } else {
                                                $result->addValue(
                                                        array( 'query', 'pages', intval( $pageId ) ),
                                                        'imagerepository', ''
                                                );
                                                // The above can't fail because it doesn't increase the result size
                                                continue;
                                        }
                                }

                                /** @var $img File */
                                $img = $images[$title];

                                if ( self::getTransformCount() >= self::TRANSFORM_LIMIT ) {
                                        if ( count( $pageIds[NS_FILE] ) == 1 ) {
                                                // See the 'the user is screwed' comment below
                                                $this->setContinueEnumParameter( 'start',
                                                        $start !== null ? $start : wfTimestamp( TS_ISO_8601, $img->getTimestamp() )
                                                );
                                        } else {
                                                $this->setContinueEnumParameter( 'continue',
                                                        $this->getContinueStr( $img, $start ) );
                                        }
                                        break;
                                }

                                $fit = $result->addValue(
                                        array( 'query', 'pages', intval( $pageId ) ),
                                        'imagerepository', $img->getRepoName()
                                );
                                if ( !$fit ) {
                                        if ( count( $pageIds[NS_FILE] ) == 1 ) {
                                                // The user is screwed. imageinfo can't be solely
                                                // responsible for exceeding the limit in this case,
                                                // so set a query-continue that just returns the same
                                                // thing again. When the violating queries have been
                                                // out-continued, the result will get through
                                                $this->setContinueEnumParameter( 'start',
                                                        $start !== null ? $start : wfTimestamp( TS_ISO_8601, $img->getTimestamp() )
                                                );
                                        } else {
                                                $this->setContinueEnumParameter( 'continue',
                                                        $this->getContinueStr( $img, $start ) );
                                        }
                                        break;
                                }

                                // Check if we can make the requested thumbnail, and get transform parameters.
                                $finalThumbParams = $this->mergeThumbParams( $img, $scale, $params['urlparam'] );

                                // Get information about the current version first
                                // Check that the current version is within the start-end boundaries
                                $gotOne = false;
                                if (
                                        ( is_null( $start ) || $img->getTimestamp() <= $start ) &&
                                        ( is_null( $params['end'] ) || $img->getTimestamp() >= $params['end'] )
                                ) {
                                        $gotOne = true;

                                        $fit = $this->addPageSubItem( $pageId,
                                                self::getInfo( $img, $prop, $result,
                                                        $finalThumbParams, $opts
                                                )
                                        );
                                        if ( !$fit ) {
                                                if ( count( $pageIds[NS_FILE] ) == 1 ) {
                                                        // See the 'the user is screwed' comment above
                                                        $this->setContinueEnumParameter( 'start',
                                                                wfTimestamp( TS_ISO_8601, $img->getTimestamp() ) );
                                                } else {
                                                        $this->setContinueEnumParameter( 'continue',
                                                                $this->getContinueStr( $img ) );
                                                }
                                                break;
                                        }
                                }

                                // Now get the old revisions
                                // Get one more to facilitate query-continue functionality
                                $count = ( $gotOne ? 1 : 0 );
                                $oldies = $img->getHistory( $params['limit'] - $count + 1, $start, $params['end'] );
                                /** @var $oldie File */
                                foreach ( $oldies as $oldie ) {
                                        if ( ++$count > $params['limit'] ) {
                                                // We've reached the extra one which shows that there are
                                                // additional pages to be had. Stop here...
                                                // Only set a query-continue if there was only one title
                                                if ( count( $pageIds[NS_FILE] ) == 1 ) {
                                                        $this->setContinueEnumParameter( 'start',
                                                                wfTimestamp( TS_ISO_8601, $oldie->getTimestamp() ) );
                                                }
                                                break;
                                        }
                                        $fit = self::getTransformCount() < self::TRANSFORM_LIMIT &&
                                                $this->addPageSubItem( $pageId,
                                                        self::getInfo( $oldie, $prop, $result,
                                                                $finalThumbParams, $opts
                                                        )
                                                );
                                        if ( !$fit ) {
                                                if ( count( $pageIds[NS_FILE] ) == 1 ) {
                                                        $this->setContinueEnumParameter( 'start',
                                                                wfTimestamp( TS_ISO_8601, $oldie->getTimestamp() ) );
                                                } else {
                                                        $this->setContinueEnumParameter( 'continue',
                                                                $this->getContinueStr( $oldie ) );
                                                }
                                                break;
                                        }
                                }
                                if ( !$fit ) {
                                        break;
                                }
                        }
                }
        }

        /**
         * From parameters, construct a 'scale' array
         * @param array $params Parameters passed to api.
         * @return array|null Key-val array of 'width' and 'height', or null
         */
        public function getScale( $params ) {
                $p = $this->getModulePrefix();

                if ( $params['urlwidth'] != -1 ) {
                        $scale = array();
                        $scale['width'] = $params['urlwidth'];
                        $scale['height'] = $params['urlheight'];
                } elseif ( $params['urlheight'] != -1 ) {
                        // Height is specified but width isn't
                        // Don't set $scale['width']; this signals mergeThumbParams() to fill it with the image's width
                        $scale = array();
                        $scale['height'] = $params['urlheight'];
                } else {
                        if ( $params['urlparam'] ) {
                                // Audio files might not have a width/height.
                                $scale = array();
                        } else {
                                $scale = null;
                        }
                }

                return $scale;
        }

        /** Validate and merge scale parameters with handler thumb parameters, give error if invalid.
         *
         * We do this later than getScale, since we need the image
         * to know which handler, since handlers can make their own parameters.
         * @param File $image Image that params are for.
         * @param array $thumbParams Thumbnail parameters from getScale
         * @param string $otherParams String of otherParams (iiurlparam).
         * @return array Array of parameters for transform.
         */
        protected function mergeThumbParams( $image, $thumbParams, $otherParams ) {
                if ( $thumbParams === null ) {
                        // No scaling requested
                        return null;
                }
                if ( !isset( $thumbParams['width'] ) && isset( $thumbParams['height'] ) ) {
                        // We want to limit only by height in this situation, so pass the
                        // image's full width as the limiting width. But some file types
                        // don't have a width of their own, so pick something arbitrary so
                        // thumbnailing the default icon works.
                        if ( $image->getWidth() <= 0 ) {
                                $thumbParams['width'] = max( $this->getConfig()->get( 'ThumbLimits' ) );
                        } else {
                                $thumbParams['width'] = $image->getWidth();
                        }
                }

                if ( !$otherParams ) {
                        $this->checkParameterNormalise( $image, $thumbParams );
                        return $thumbParams;
                }
                $p = $this->getModulePrefix();

                $h = $image->getHandler();
                if ( !$h ) {
                        $this->setWarning( 'Could not create thumbnail because ' .
                                $image->getName() . ' does not have an associated image handler' );

                        return $thumbParams;
                }

                $paramList = $h->parseParamString( $otherParams );
                if ( !$paramList ) {
                        // Just set a warning (instead of dieUsage), as in many cases
                        // we could still render the image using width and height parameters,
                        // and this type of thing could happen between different versions of
                        // handlers.
                        $this->setWarning( "Could not parse {$p}urlparam for " . $image->getName()
                                . '. Using only width and height' );
                        $this->checkParameterNormalise( $image, $thumbParams );
                        return $thumbParams;
                }

                if ( isset( $paramList['width'] ) && isset( $thumbParams['width'] ) ) {
                        if ( intval( $paramList['width'] ) != intval( $thumbParams['width'] ) ) {
                                $this->setWarning( "Ignoring width value set in {$p}urlparam ({$paramList['width']}) "
                                        . "in favor of width value derived from {$p}urlwidth/{$p}urlheight "
                                        . "({$thumbParams['width']})" );
                        }
                }

                foreach ( $paramList as $name => $value ) {
                        if ( !$h->validateParam( $name, $value ) ) {
                                $this->dieUsage( "Invalid value for {$p}urlparam ($name=$value)", "urlparam" );
                        }
                }

                $finalParams = $thumbParams + $paramList;
                $this->checkParameterNormalise( $image, $finalParams );
                return $finalParams;
        }

        /**
         * Verify that the final image parameters can be normalised.
         *
         * This doesn't use the normalised parameters, since $file->transform
         * expects the pre-normalised parameters, but doing the normalisation
         * allows us to catch certain error conditions early (such as missing
         * required parameter).
         *
         * @param $image File
         * @param $finalParams array List of parameters to transform image with
         */
        protected function checkParameterNormalise( $image, $finalParams ) {
                $h = $image->getHandler();
                if ( !$h ) {
                        return;
                }
                // Note: normaliseParams modifies the array in place, but we aren't interested
                // in the actual normalised version, only if we can actually normalise them,
                // so we use the functions scope to throw away the normalisations.
                if ( !$h->normaliseParams( $image, $finalParams ) ) {
                        $this->dieUsage( "Could not normalise image parameters for " . $image->getName(), "urlparamnormal" );
                }
        }

        /**
         * Get result information for an image revision
         *
         * @param File $file
         * @param array $prop Array of properties to get (in the keys)
         * @param ApiResult $result
         * @param array $thumbParams Containing 'width' and 'height' items, or null
         * @param array|bool|string $opts Options for data fetching.
         *   This is an array consisting of the keys:
         *    'version': The metadata version for the metadata option
         *    'language': The language for extmetadata property
         *    'multilang': Return all translations in extmetadata property
         *    'revdelUser': User to use when checking whether to show revision-deleted fields.
         * @return array Result array
         */
        static function getInfo( $file, $prop, $result, $thumbParams = null, $opts = false ) {
                global $wgContLang;

                $anyHidden = false;

                if ( !$opts || is_string( $opts ) ) {
                        $opts = array(
                                'version' => $opts ?: 'latest',
                                'language' => $wgContLang,
                                'multilang' => false,
                                'extmetadatafilter' => array(),
                                'revdelUser' => null,
                        );
                }
                $version = $opts['version'];
                $vals = array();
                // Timestamp is shown even if the file is revdelete'd in interface
                // so do same here.
                if ( isset( $prop['timestamp'] ) ) {
                        $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $file->getTimestamp() );
                }

                // Handle external callers who don't pass revdelUser
                if ( isset( $opts['revdelUser'] ) && $opts['revdelUser'] ) {
                        $revdelUser = $opts['revdelUser'];
                        $canShowField = function ( $field ) use ( $file, $revdelUser ) {
                                return $file->userCan( $field, $revdelUser );
                        };
                } else {
                        $canShowField = function ( $field ) use ( $file ) {
                                return !$file->isDeleted( $field );
                        };
                }

                $user = isset( $prop['user'] );
                $userid = isset( $prop['userid'] );

                if ( $user || $userid ) {
                        if ( $file->isDeleted( File::DELETED_USER ) ) {
                                $vals['userhidden'] = '';
                                $anyHidden = true;
                        }
                        if ( $canShowField( File::DELETED_USER ) ) {
                                if ( $user ) {
                                        $vals['user'] = $file->getUser();
                                }
                                if ( $userid ) {
                                        $vals['userid'] = $file->getUser( 'id' );
                                }
                                if ( !$file->getUser( 'id' ) ) {
                                        $vals['anon'] = '';
                                }
                        }
                }

                // This is shown even if the file is revdelete'd in interface
                // so do same here.
                if ( isset( $prop['size'] ) || isset( $prop['dimensions'] ) ) {
                        $vals['size'] = intval( $file->getSize() );
                        $vals['width'] = intval( $file->getWidth() );
                        $vals['height'] = intval( $file->getHeight() );

                        $pageCount = $file->pageCount();
                        if ( $pageCount !== false ) {
                                $vals['pagecount'] = $pageCount;
                        }

                        // length as in how many seconds long a video is.
                        $length = $file->getLength();
                        if ( $length ) {
                                // Call it duration, because "length" can be ambiguous.
                                $vals['duration'] = (float)$length;
                        }
                }

                $pcomment = isset( $prop['parsedcomment'] );
                $comment = isset( $prop['comment'] );

                if ( $pcomment || $comment ) {
                        if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
                                $vals['commenthidden'] = '';
                                $anyHidden = true;
                        }
                        if ( $canShowField( File::DELETED_COMMENT ) ) {
                                if ( $pcomment ) {
                                        $vals['parsedcomment'] = Linker::formatComment(
                                                $file->getDescription( File::RAW ), $file->getTitle() );
                                }
                                if ( $comment ) {
                                        $vals['comment'] = $file->getDescription( File::RAW );
                                }
                        }
                }

                $canonicaltitle = isset( $prop['canonicaltitle'] );
                $url = isset( $prop['url'] );
                $sha1 = isset( $prop['sha1'] );
                $meta = isset( $prop['metadata'] );
                $extmetadata = isset( $prop['extmetadata'] );
                $commonmeta = isset( $prop['commonmetadata'] );
                $mime = isset( $prop['mime'] );
                $mediatype = isset( $prop['mediatype'] );
                $archive = isset( $prop['archivename'] );
                $bitdepth = isset( $prop['bitdepth'] );
                $uploadwarning = isset( $prop['uploadwarning'] );

                if ( $uploadwarning ) {
                        $vals['html'] = SpecialUpload::getExistsWarning( UploadBase::getExistsWarning( $file ) );
                }

                if ( $file->isDeleted( File::DELETED_FILE ) ) {
                        $vals['filehidden'] = '';
                        $anyHidden = true;
                }

                if ( $anyHidden && $file->isDeleted( File::DELETED_RESTRICTED ) ) {
                        $vals['suppressed'] = true;
                }

                if ( !$canShowField( File::DELETED_FILE ) ) {
                        //Early return, tidier than indenting all following things one level
                        return $vals;
                }

                if ( $canonicaltitle ) {
                        $vals['canonicaltitle'] = $file->getTitle()->getPrefixedText();
                }

                if ( $url ) {
                        if ( !is_null( $thumbParams ) ) {
                                $mto = $file->transform( $thumbParams );
                                self::$transformCount++;
                                if ( $mto && !$mto->isError() ) {
                                        $vals['thumburl'] = wfExpandUrl( $mto->getUrl(), PROTO_CURRENT );

                                        // bug 23834 - If the URL's are the same, we haven't resized it, so shouldn't give the wanted
                                        // thumbnail sizes for the thumbnail actual size
                                        if ( $mto->getUrl() !== $file->getUrl() ) {
                                                $vals['thumbwidth'] = intval( $mto->getWidth() );
                                                $vals['thumbheight'] = intval( $mto->getHeight() );
                                        } else {
                                                $vals['thumbwidth'] = intval( $file->getWidth() );
                                                $vals['thumbheight'] = intval( $file->getHeight() );
                                        }

                                        if ( isset( $prop['thumbmime'] ) && $file->getHandler() ) {
                                                list( , $mime ) = $file->getHandler()->getThumbType(
                                                        $mto->getExtension(), $file->getMimeType(), $thumbParams );
                                                $vals['thumbmime'] = $mime;
                                        }
                                } elseif ( $mto && $mto->isError() ) {
                                        $vals['thumberror'] = $mto->toText();
                                }
                        }
                        $vals['url'] = wfExpandUrl( $file->getFullURL(), PROTO_CURRENT );
                        $vals['descriptionurl'] = wfExpandUrl( $file->getDescriptionUrl(), PROTO_CURRENT );
                }

                if ( $sha1 ) {
                        $vals['sha1'] = wfBaseConvert( $file->getSha1(), 36, 16, 40 );
                }

                if ( $meta ) {
                        wfSuppressWarnings();
                        $metadata = unserialize( $file->getMetadata() );
                        wfRestoreWarnings();
                        if ( $metadata && $version !== 'latest' ) {
                                $metadata = $file->convertMetadataVersion( $metadata, $version );
                        }
                        $vals['metadata'] = $metadata ? self::processMetaData( $metadata, $result ) : null;
                }
                if ( $commonmeta ) {
                        $metaArray = $file->getCommonMetaArray();
                        $vals['commonmetadata'] = $metaArray ? self::processMetaData( $metaArray, $result ) : array();
                }

                if ( $extmetadata ) {
                        // Note, this should return an array where all the keys
                        // start with a letter, and all the values are strings.
                        // Thus there should be no issue with format=xml.
                        $format = new FormatMetadata;
                        $format->setSingleLanguage( !$opts['multilang'] );
                        $format->getContext()->setLanguage( $opts['language'] );
                        $extmetaArray = $format->fetchExtendedMetadata( $file );
                        if ( $opts['extmetadatafilter'] ) {
                                $extmetaArray = array_intersect_key(
                                        $extmetaArray, array_flip( $opts['extmetadatafilter'] )
                                );
                        }
                        $vals['extmetadata'] = $extmetaArray;
                }

                if ( $mime ) {
                        $vals['mime'] = $file->getMimeType();
                }

                if ( $mediatype ) {
                        $vals['mediatype'] = $file->getMediaType();
                }

                if ( $archive && $file->isOld() ) {
                        $vals['archivename'] = $file->getArchiveName();
                }

                if ( $bitdepth ) {
                        $vals['bitdepth'] = $file->getBitDepth();
                }

                return $vals;
        }

        /**
         * Get the count of image transformations performed
         *
         * If this is >= TRANSFORM_LIMIT, you should probably stop processing images.
         *
         * @return int Count
         */
        static function getTransformCount() {
                return self::$transformCount;
        }

        /**
         *
         * @param array $metadata
         * @param ApiResult $result
         * @return array
         */
        public static function processMetaData( $metadata, $result ) {
                $retval = array();
                if ( is_array( $metadata ) ) {
                        foreach ( $metadata as $key => $value ) {
                                $r = array( 'name' => $key );
                                if ( is_array( $value ) ) {
                                        $r['value'] = self::processMetaData( $value, $result );
                                } else {
                                        $r['value'] = $value;
                                }
                                $retval[] = $r;
                        }
                }
                $result->setIndexedTagName( $retval, 'metadata' );

                return $retval;
        }

        public function getCacheMode( $params ) {
                if ( $this->userCanSeeRevDel() ) {
                        return 'private';
                }

                return 'public';
        }

        /**
         * @param File $img
         * @param null|string $start
         * @return string
         */
        protected function getContinueStr( $img, $start = null ) {
                if ( $start === null ) {
                        $start = $img->getTimestamp();
                }

                return $img->getOriginalTitle()->getDBkey() . '|' . $start;
        }

        public function getAllowedParams() {
                global $wgContLang;

                return array(
                        'prop' => array(
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_DFLT => 'timestamp|user',
                                ApiBase::PARAM_TYPE => self::getPropertyNames(),
                                ApiBase::PARAM_HELP_MSG_PER_VALUE => self::getPropertyMessages(),
                        ),
                        'limit' => array(
                                ApiBase::PARAM_TYPE => 'limit',
                                ApiBase::PARAM_DFLT => 1,
                                ApiBase::PARAM_MIN => 1,
                                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
                        ),
                        'start' => array(
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ),
                        'end' => array(
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ),
                        'urlwidth' => array(
                                ApiBase::PARAM_TYPE => 'integer',
                                ApiBase::PARAM_DFLT => -1,
                                ApiBase::PARAM_HELP_MSG => array(
                                        'apihelp-query+imageinfo-param-urlwidth',
                                        ApiQueryImageInfo::TRANSFORM_LIMIT,
                                ),
                        ),
                        'urlheight' => array(
                                ApiBase::PARAM_TYPE => 'integer',
                                ApiBase::PARAM_DFLT => -1
                        ),
                        'metadataversion' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_DFLT => '1',
                        ),
                        'extmetadatalanguage' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_DFLT => $wgContLang->getCode(),
                        ),
                        'extmetadatamultilang' => array(
                                ApiBase::PARAM_TYPE => 'boolean',
                                ApiBase::PARAM_DFLT => false,
                        ),
                        'extmetadatafilter' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_ISMULTI => true,
                        ),
                        'urlparam' => array(
                                ApiBase::PARAM_DFLT => '',
                                ApiBase::PARAM_TYPE => 'string',
                        ),
                        'continue' => array(
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
                        ),
                        'localonly' => false,
                );
        }

        /**
         * Returns all possible parameters to iiprop
         *
         * @param array $filter List of properties to filter out
         * @return array
         */
        public static function getPropertyNames( $filter = array() ) {
                return array_keys( self::getPropertyMessages( $filter ) );
        }

        /**
         * Returns messages for all possible parameters to iiprop
         *
         * @param array $filter List of properties to filter out
         * @return array
         */
        public static function getPropertyMessages( $filter = array() ) {
                return array_diff_key(
                        array(
                                'timestamp' => 'apihelp-query+imageinfo-paramvalue-prop-timestamp',
                                'user' => 'apihelp-query+imageinfo-paramvalue-prop-user',
                                'userid' => 'apihelp-query+imageinfo-paramvalue-prop-userid',
                                'comment' => 'apihelp-query+imageinfo-paramvalue-prop-comment',
                                'parsedcomment' => 'apihelp-query+imageinfo-paramvalue-prop-parsedcomment',
                                'canonicaltitle' => 'apihelp-query+imageinfo-paramvalue-prop-canonicaltitle',
                                'url' => 'apihelp-query+imageinfo-paramvalue-prop-url',
                                'size' => 'apihelp-query+imageinfo-paramvalue-prop-size',
                                'dimensions' => 'apihelp-query+imageinfo-paramvalue-prop-dimensions',
                                'sha1' => 'apihelp-query+imageinfo-paramvalue-prop-sha1',
                                'mime' => 'apihelp-query+imageinfo-paramvalue-prop-mime',
                                'thumbmime' => 'apihelp-query+imageinfo-paramvalue-prop-thumbmime',
                                'mediatype' => 'apihelp-query+imageinfo-paramvalue-prop-mediatype',
                                'metadata' => 'apihelp-query+imageinfo-paramvalue-prop-metadata',
                                'commonmetadata' => 'apihelp-query+imageinfo-paramvalue-prop-commonmetadata',
                                'extmetadata' => 'apihelp-query+imageinfo-paramvalue-prop-extmetadata',
                                'archivename' => 'apihelp-query+imageinfo-paramvalue-prop-archivename',
                                'bitdepth' => 'apihelp-query+imageinfo-paramvalue-prop-bitdepth',
                                'uploadwarning' => 'apihelp-query+imageinfo-paramvalue-prop-uploadwarning',
                        ),
                        array_flip( $filter )
                );
        }

        /**
         * Returns array key value pairs of properties and their descriptions
         *
         * @deprecated since 1.25
         * @param string $modulePrefix
         * @return array
         */
        private static function getProperties( $modulePrefix = '' ) {
                return array(
                        'timestamp' =>      ' timestamp     - Adds timestamp for the uploaded version',
                        'user' =>           ' user          - Adds the user who uploaded the image version',
                        'userid' =>         ' userid        - Add the user ID that uploaded the image version',
                        'comment' =>        ' comment       - Comment on the version',
                        'parsedcomment' =>  ' parsedcomment - Parse the comment on the version',
                        'canonicaltitle' => ' canonicaltitle - Adds the canonical title of the image file',
                        'url' =>            ' url           - Gives URL to the image and the description page',
                        'size' =>           ' size          - Adds the size of the image in bytes, ' .
                                'its height and its width. Page count and duration are added if applicable',
                        'dimensions' =>     ' dimensions    - Alias for size', // B/C with Allimages
                        'sha1' =>           ' sha1          - Adds SHA-1 hash for the image',
                        'mime' =>           ' mime          - Adds MIME type of the image',
                        'thumbmime' =>      ' thumbmime     - Adds MIME type of the image thumbnail' .
                                ' (requires url and param ' . $modulePrefix . 'urlwidth)',
                        'mediatype' =>      ' mediatype     - Adds the media type of the image',
                        'metadata' =>       ' metadata      - Lists Exif metadata for the version of the image',
                        'commonmetadata' => ' commonmetadata - Lists file format generic metadata ' .
                                'for the version of the image',
                        'extmetadata' =>    ' extmetadata   - Lists formatted metadata combined ' .
                                'from multiple sources. Results are HTML formatted.',
                        'archivename' =>    ' archivename   - Adds the file name of the archive ' .
                                'version for non-latest versions',
                        'bitdepth' =>       ' bitdepth      - Adds the bit depth of the version',
                        'uploadwarning' =>  ' uploadwarning - Used by the Special:Upload page to ' .
                                'get information about an existing file. Not intended for use outside MediaWiki core',
                );
        }

        /**
         * Returns the descriptions for the properties provided by getPropertyNames()
         *
         * @deprecated since 1.25
         * @param array $filter List of properties to filter out
         * @param string $modulePrefix
         * @return array
         */
        public static function getPropertyDescriptions( $filter = array(), $modulePrefix = '' ) {
                return array_merge(
                        array( 'What image information to get:' ),
                        array_values( array_diff_key( self::getProperties( $modulePrefix ), array_flip( $filter ) ) )
                );
        }

        protected function getExamplesMessages() {
                return array(
                        'action=query&titles=File:Albert%20Einstein%20Head.jpg&prop=imageinfo'
                                => 'apihelp-query+imageinfo-example-simple',
                        'action=query&titles=File:Test.jpg&prop=imageinfo&iilimit=50&' .
                                'iiend=2007-12-31T23:59:59Z&iiprop=timestamp|user|url'
                                => 'apihelp-query+imageinfo-example-dated',
                );
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Properties#imageinfo_.2F_ii';
        }
}