isEnabled() ) { wfDebug( __METHOD__ . ": $class is not enabled\n" ); self::$handlers[$class] = false; } } return self::$handlers[$class]; } /** * Resets all static caches */ public static function resetCache() { self::$handlers = array(); } /** * Get an associative array mapping magic word IDs to parameter names. * Will be used by the parser to identify parameters. */ abstract function getParamMap(); /** * Validate a thumbnail parameter at parse time. * Return true to accept the parameter, and false to reject it. * If you return false, the parser will do something quiet and forgiving. * * @param string $name * @param mixed $value */ abstract function validateParam( $name, $value ); /** * Merge a parameter array into a string appropriate for inclusion in filenames * * @param array $params Array of parameters that have been through normaliseParams. * @return string */ abstract function makeParamString( $params ); /** * Parse a param string made with makeParamString back into an array * * @param string $str The parameter string without file name (e.g. 122px) * @return array|bool Array of parameters or false on failure. */ abstract function parseParamString( $str ); /** * Changes the parameter array as necessary, ready for transformation. * Should be idempotent. * Returns false if the parameters are unacceptable and the transform should fail * @param File $image * @param array $params */ abstract function normaliseParams( $image, &$params ); /** * Get an image size array like that returned by getimagesize(), or false if it * can't be determined. * * This function is used for determining the width, height and bitdepth directly * from an image. The results are stored in the database in the img_width, * img_height, img_bits fields. * * @note If this is a multipage file, return the width and height of the * first page. * * @param File $image The image object, or false if there isn't one * @param string $path The filename * @return array Follow the format of PHP getimagesize() internal function. * See http://www.php.net/getimagesize. MediaWiki will only ever use the * first two array keys (the width and height), and the 'bits' associative * key. All other array keys are ignored. Returning a 'bits' key is optional * as not all formats have a notion of "bitdepth". */ abstract function getImageSize( $image, $path ); /** * Get handler-specific metadata which will be saved in the img_metadata field. * * @param File $image The image object, or false if there isn't one. * Warning, FSFile::getPropsFromPath might pass an (object)array() instead (!) * @param string $path The filename * @return string A string of metadata in php serialized form (Run through serialize()) */ function getMetadata( $image, $path ) { return ''; } /** * Get metadata version. * * This is not used for validating metadata, this is used for the api when returning * metadata, since api content formats should stay the same over time, and so things * using ForeignApiRepo can keep backwards compatibility * * All core media handlers share a common version number, and extensions can * use the GetMetadataVersion hook to append to the array (they should append a unique * string so not to get confusing). If there was a media handler named 'foo' with metadata * version 3 it might add to the end of the array the element 'foo=3'. if the core metadata * version is 2, the end version string would look like '2;foo=3'. * * @return string Version string */ static function getMetadataVersion() { $version = array( '2' ); // core metadata version Hooks::run( 'GetMetadataVersion', array( &$version ) ); return implode( ';', $version ); } /** * Convert metadata version. * * By default just returns $metadata, but can be used to allow * media handlers to convert between metadata versions. * * @param string|array $metadata Metadata array (serialized if string) * @param int $version Target version * @return array Serialized metadata in specified version, or $metadata on fail. */ function convertMetadataVersion( $metadata, $version = 1 ) { if ( !is_array( $metadata ) ) { //unserialize to keep return parameter consistent. MediaWiki\suppressWarnings(); $ret = unserialize( $metadata ); MediaWiki\restoreWarnings(); return $ret; } return $metadata; } /** * Get a string describing the type of metadata, for display purposes. * * @note This method is currently unused. * @param File $image * @return string */ function getMetadataType( $image ) { return false; } /** * Check if the metadata string is valid for this handler. * If it returns MediaHandler::METADATA_BAD (or false), Image * will reload the metadata from the file and update the database. * MediaHandler::METADATA_GOOD for if the metadata is a-ok, * MediaHandler::METADATA_COMPATIBLE if metadata is old but backwards * compatible (which may or may not trigger a metadata reload). * * @note Returning self::METADATA_BAD will trigger a metadata reload from * file on page view. Always returning this from a broken file, or suddenly * triggering as bad metadata for a large number of files can cause * performance problems. * @param File $image * @param string $metadata The metadata in serialized form * @return bool */ function isMetadataValid( $image, $metadata ) { return self::METADATA_GOOD; } /** * Get an array of standard (FormatMetadata type) metadata values. * * The returned data is largely the same as that from getMetadata(), * but formatted in a standard, stable, handler-independent way. * The idea being that some values like ImageDescription or Artist * are universal and should be retrievable in a handler generic way. * * The specific properties are the type of properties that can be * handled by the FormatMetadata class. These values are exposed to the * user via the filemetadata parser function. * * Details of the response format of this function can be found at * https://www.mediawiki.org/wiki/Manual:File_metadata_handling * tl/dr: the response is an associative array of * properties keyed by name, but the value can be complex. You probably * want to call one of the FormatMetadata::flatten* functions on the * property values before using them, or call * FormatMetadata::getFormattedData() on the full response array, which * transforms all values into prettified, human-readable text. * * Subclasses overriding this function must return a value which is a * valid API response fragment (all associative array keys are valid * XML tagnames). * * Note, if the file simply has no metadata, but the handler supports * this interface, it should return an empty array, not false. * * @param File $file * @return array|bool False if interface not supported * @since 1.23 */ public function getCommonMetaArray( File $file ) { return false; } /** * Get a MediaTransformOutput object representing an alternate of the transformed * output which will call an intermediary thumbnail assist script. * * Used when the repository has a thumbnailScriptUrl option configured. * * Return false to fall back to the regular getTransform(). * @param File $image * @param string $script * @param array $params * @return bool|ThumbnailImage */ function getScriptedTransform( $image, $script, $params ) { return false; } /** * Get a MediaTransformOutput object representing the transformed output. Does not * actually do the transform. * * @param File $image The image object * @param string $dstPath Filesystem destination path * @param string $dstUrl Destination URL to use in output HTML * @param array $params Arbitrary set of parameters validated by $this->validateParam() * @return MediaTransformOutput */ final function getTransform( $image, $dstPath, $dstUrl, $params ) { return $this->doTransform( $image, $dstPath, $dstUrl, $params, self::TRANSFORM_LATER ); } /** * Get a MediaTransformOutput object representing the transformed output. Does the * transform unless $flags contains self::TRANSFORM_LATER. * * @param File $image The image object * @param string $dstPath Filesystem destination path * @param string $dstUrl Destination URL to use in output HTML * @param array $params Arbitrary set of parameters validated by $this->validateParam() * Note: These parameters have *not* gone through $this->normaliseParams() * @param int $flags A bitfield, may contain self::TRANSFORM_LATER * @return MediaTransformOutput */ abstract function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ); /** * Get the thumbnail extension and MIME type for a given source MIME type * * @param string $ext Extension of original file * @param string $mime MIME type of original file * @param array $params Handler specific rendering parameters * @return array Thumbnail extension and MIME type */ function getThumbType( $ext, $mime, $params = null ) { $magic = MimeMagic::singleton(); if ( !$ext || $magic->isMatchingExtension( $ext, $mime ) === false ) { // The extension is not valid for this MIME type and we do // recognize the MIME type $extensions = $magic->getExtensionsForType( $mime ); if ( $extensions ) { return array( strtok( $extensions, ' ' ), $mime ); } } // The extension is correct (true) or the MIME type is unknown to // MediaWiki (null) return array( $ext, $mime ); } /** * Get useful response headers for GET/HEAD requests for a file with the given metadata * * @param mixed $metadata Result of the getMetadata() function of this handler for a file * @return array */ public function getStreamHeaders( $metadata ) { return array(); } /** * True if the handled types can be transformed * * @param File $file * @return bool */ function canRender( $file ) { return true; } /** * True if handled types cannot be displayed directly in a browser * but can be rendered * * @param File $file * @return bool */ function mustRender( $file ) { return false; } /** * True if the type has multi-page capabilities * * @param File $file * @return bool */ function isMultiPage( $file ) { return false; } /** * Page count for a multi-page document, false if unsupported or unknown * * @param File $file * @return bool */ function pageCount( $file ) { return false; } /** * The material is vectorized and thus scaling is lossless * * @param File $file * @return bool */ function isVectorized( $file ) { return false; } /** * The material is an image, and is animated. * In particular, video material need not return true. * @note Before 1.20, this was a method of ImageHandler only * * @param File $file * @return bool */ function isAnimatedImage( $file ) { return false; } /** * If the material is animated, we can animate the thumbnail * @since 1.20 * * @param File $file * @return bool If material is not animated, handler may return any value. */ function canAnimateThumbnail( $file ) { return true; } /** * False if the handler is disabled for all files * @return bool */ function isEnabled() { return true; } /** * Get an associative array of page dimensions * Currently "width" and "height" are understood, but this might be * expanded in the future. * Returns false if unknown. * * It is expected that handlers for paged media (e.g. DjVuHandler) * will override this method so that it gives the correct results * for each specific page of the file, using the $page argument. * * @note For non-paged media, use getImageSize. * * @param File $image * @param int $page What page to get dimensions of * @return array|bool */ function getPageDimensions( $image, $page ) { $gis = $this->getImageSize( $image, $image->getLocalRefPath() ); if ( $gis ) { return array( 'width' => $gis[0], 'height' => $gis[1] ); } else { return false; } } /** * Generic getter for text layer. * Currently overloaded by PDF and DjVu handlers * @param File $image * @param int $page Page number to get information for * @return bool|string Page text or false when no text found or if * unsupported. */ function getPageText( $image, $page ) { return false; } /** * Get the text of the entire document. * @param File $file * @return bool|string The text of the document or false if unsupported. */ public function getEntireText( File $file ) { $numPages = $file->pageCount(); if ( !$numPages ) { // Not a multipage document return $this->getPageText( $file, 1 ); } $document = ''; for ( $i = 1; $i <= $numPages; $i++ ) { $curPage = $this->getPageText( $file, $i ); if ( is_string( $curPage ) ) { $document .= $curPage . "\n"; } } if ( $document !== '' ) { return $document; } return false; } /** * Get an array structure that looks like this: * * array( * 'visible' => array( * 'Human-readable name' => 'Human readable value', * ... * ), * 'collapsed' => array( * 'Human-readable name' => 'Human readable value', * ... * ) * ) * The UI will format this into a table where the visible fields are always * visible, and the collapsed fields are optionally visible. * * The function should return false if there is no metadata to display. */ /** * @todo FIXME: This interface is not very flexible. The media handler * should generate HTML instead. It can do all the formatting according * to some standard. That makes it possible to do things like visual * indication of grouped and chained streams in ogg container files. * @param File $image * @param bool|IContextSource $context Context to use (optional) * @return array|bool */ function formatMetadata( $image, $context = false ) { return false; } /** sorts the visible/invisible field. * Split off from ImageHandler::formatMetadata, as used by more than * one type of handler. * * This is used by the media handlers that use the FormatMetadata class * * @param array $metadataArray Metadata array * @param bool|IContextSource $context Context to use (optional) * @return array Array for use displaying metadata. */ function formatMetadataHelper( $metadataArray, $context = false ) { $result = array( 'visible' => array(), 'collapsed' => array() ); $formatted = FormatMetadata::getFormattedData( $metadataArray, $context ); // Sort fields into visible and collapsed $visibleFields = $this->visibleMetadataFields(); foreach ( $formatted as $name => $value ) { $tag = strtolower( $name ); self::addMeta( $result, in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed', 'exif', $tag, $value ); } return $result; } /** * Get a list of metadata items which should be displayed when * the metadata table is collapsed. * * @return array Array of strings */ protected function visibleMetadataFields() { return FormatMetadata::getVisibleFields(); } /** * This is used to generate an array element for each metadata value * That array is then used to generate the table of metadata values * on the image page * * @param array &$array An array containing elements for each type of visibility * and each of those elements being an array of metadata items. This function adds * a value to that array. * @param string $visibility ('visible' or 'collapsed') if this value is hidden * by default. * @param string $type Type of metadata tag (currently always 'exif') * @param string $id The name of the metadata tag (like 'artist' for example). * its name in the table displayed is the message "$type-$id" (Ex exif-artist ). * @param string $value Thingy goes into a wikitext table; it used to be escaped but * that was incompatible with previous practise of customized display * with wikitext formatting via messages such as 'exif-model-value'. * So the escaping is taken back out, but generally this seems a confusing * interface. * @param bool|string $param Value to pass to the message for the name of the field * as $1. Currently this parameter doesn't seem to ever be used. * * Note, everything here is passed through the parser later on (!) */ protected static function addMeta( &$array, $visibility, $type, $id, $value, $param = false ) { $msg = wfMessage( "$type-$id", $param ); if ( $msg->exists() ) { $name = $msg->text(); } else { // This is for future compatibility when using instant commons. // So as to not display as ugly a name if a new metadata // property is defined that we don't know about // (not a major issue since such a property would be collapsed // by default). wfDebug( __METHOD__ . ' Unknown metadata name: ' . $id . "\n" ); $name = wfEscapeWikiText( $id ); } $array[$visibility][] = array( 'id' => "$type-$id", 'name' => $name, 'value' => $value ); } /** * Short description. Shown on Special:Search results. * * @param File $file * @return string */ function getShortDesc( $file ) { return self::getGeneralShortDesc( $file ); } /** * Long description. Shown under image on image description page surounded by (). * * @param File $file * @return string */ function getLongDesc( $file ) { return self::getGeneralLongDesc( $file ); } /** * Used instead of getShortDesc if there is no handler registered for file. * * @param File $file * @return string */ static function getGeneralShortDesc( $file ) { global $wgLang; return htmlspecialchars( $wgLang->formatSize( $file->getSize() ) ); } /** * Used instead of getLongDesc if there is no handler registered for file. * * @param File $file * @return string */ static function getGeneralLongDesc( $file ) { return wfMessage( 'file-info' )->sizeParams( $file->getSize() ) ->params( '' . $file->getMimeType() . '' )->parse(); } /** * Calculate the largest thumbnail width for a given original file size * such that the thumbnail's height is at most $maxHeight. * @param int $boxWidth Width of the thumbnail box. * @param int $boxHeight Height of the thumbnail box. * @param int $maxHeight Maximum height expected for the thumbnail. * @return int */ public static function fitBoxWidth( $boxWidth, $boxHeight, $maxHeight ) { $idealWidth = $boxWidth * $maxHeight / $boxHeight; $roundedUp = ceil( $idealWidth ); if ( round( $roundedUp * $boxHeight / $boxWidth ) > $maxHeight ) { return floor( $idealWidth ); } else { return $roundedUp; } } /** * Shown in file history box on image description page. * * @param File $file * @return string Dimensions */ function getDimensionsString( $file ) { return ''; } /** * Modify the parser object post-transform. * * This is often used to do $parser->addOutputHook(), * in order to add some javascript to render a viewer. * See TimedMediaHandler or OggHandler for an example. * * @param Parser $parser * @param File $file */ function parserTransformHook( $parser, $file ) { } /** * File validation hook called on upload. * * If the file at the given local path is not valid, or its MIME type does not * match the handler class, a Status object should be returned containing * relevant errors. * * @param string $fileName The local path to the file. * @return Status */ function verifyUpload( $fileName ) { return Status::newGood(); } /** * Check for zero-sized thumbnails. These can be generated when * no disk space is available or some other error occurs * * @param string $dstPath The location of the suspect file * @param int $retval Return value of some shell process, file will be deleted if this is non-zero * @return bool True if removed, false otherwise */ function removeBadFile( $dstPath, $retval = 0 ) { if ( file_exists( $dstPath ) ) { $thumbstat = stat( $dstPath ); if ( $thumbstat['size'] == 0 || $retval != 0 ) { $result = unlink( $dstPath ); if ( $result ) { wfDebugLog( 'thumbnail', sprintf( 'Removing bad %d-byte thumbnail "%s". unlink() succeeded', $thumbstat['size'], $dstPath ) ); } else { wfDebugLog( 'thumbnail', sprintf( 'Removing bad %d-byte thumbnail "%s". unlink() failed', $thumbstat['size'], $dstPath ) ); } return true; } } return false; } /** * Remove files from the purge list. * * This is used by some video handlers to prevent ?action=purge * from removing a transcoded video, which is expensive to * regenerate. * * @see LocalFile::purgeThumbnails * * @param array $files * @param array $options Purge options. Currently will always be * an array with a single key 'forThumbRefresh' set to true. */ public function filterThumbnailPurgeList( &$files, $options ) { // Do nothing } /** * True if the handler can rotate the media * @since 1.24 non-static. From 1.21-1.23 was static * @return bool */ public function canRotate() { return false; } /** * On supporting image formats, try to read out the low-level orientation * of the file and return the angle that the file needs to be rotated to * be viewed. * * This information is only useful when manipulating the original file; * the width and height we normally work with is logical, and will match * any produced output views. * * For files we don't know, we return 0. * * @param File $file * @return int 0, 90, 180 or 270 */ public function getRotation( $file ) { return 0; } /** * Log an error that occurred in an external process * * Moved from BitmapHandler to MediaHandler with MediaWiki 1.23 * * @since 1.23 * @param int $retval * @param string $err Error reported by command. Anything longer than * MediaHandler::MAX_ERR_LOG_SIZE is stripped off. * @param string $cmd */ protected function logErrorForExternalProcess( $retval, $err, $cmd ) { # Keep error output limited (bug 57985) $errMessage = trim( substr( $err, 0, self::MAX_ERR_LOG_SIZE ) ); wfDebugLog( 'thumbnail', sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"', wfHostname(), $retval, $errMessage, $cmd ) ); } /** * Get list of languages file can be viewed in. * * @param File $file * @return string[] Array of language codes, or empty array if unsupported. * @since 1.23 */ public function getAvailableLanguages( File $file ) { return array(); } /** * On file types that support renderings in multiple languages, * which language is used by default if unspecified. * * If getAvailableLanguages returns a non-empty array, this must return * a valid language code. Otherwise can return null if files of this * type do not support alternative language renderings. * * @param File $file * @return string|null Language code or null if multi-language not supported for filetype. * @since 1.23 */ public function getDefaultRenderLanguage( File $file ) { return null; } /** * If its an audio file, return the length of the file. Otherwise 0. * * File::getLength() existed for a long time, but was calling a method * that only existed in some subclasses of this class (The TMH ones). * * @param File $file * @return float Length in seconds * @since 1.23 */ public function getLength( $file ) { return 0.0; } /** * True if creating thumbnails from the file is large or otherwise resource-intensive. * @param File $file * @return bool */ public function isExpensiveToThumbnail( $file ) { return false; } /** * Returns whether or not this handler supports the chained generation of thumbnails according * to buckets * @return bool * @since 1.24 */ public function supportsBucketing() { return false; } /** * Returns a normalised params array for which parameters have been cleaned up for bucketing * purposes * @param array $params * @return array */ public function sanitizeParamsForBucketing( $params ) { return $params; } /** * Gets configuration for the file warning message. Return value of * the following structure: * array( * 'module' => 'example.filewarning.messages', // Required, module with messages loaded for the client * 'messages' => array( // Required, array of names of messages * 'main' => 'example-filewarning-main', // Required, main warning message * 'header' => 'example-filewarning-header', // Optional, header for warning dialog * 'footer' => 'example-filewarning-footer', // Optional, footer for warning dialog * 'info' => 'example-filewarning-info', // Optional, text for more-information link (see below) * ), * 'link' => 'http://example.com', // Optional, link for more information * ) * * Returns null if no warning is necessary. * @param File $file * @return array|null */ public function getWarningConfig( $file ) { return null; } }