(bug 35565) Special:Log/patrol doesn't indicate whether patrolling was automatic

[mediawiki.git] / includes / media / Generic.php

<?php
/**
 * Media-handling base classes and generic functionality
 *
 * @file
 * @ingroup Media
 */

/**
 * Base media handler class
 *
 * @ingroup Media
 */
abstract class MediaHandler {
        const TRANSFORM_LATER = 1;
        const METADATA_GOOD = true;
        const METADATA_BAD = false;
        const METADATA_COMPATIBLE = 2; // for old but backwards compatible.
        /**
         * Instance cache
         */
        static $handlers = array();

        /**
         * Get a MediaHandler for a given MIME type from the instance cache
         *
         * @param $type string
         *
         * @return MediaHandler
         */
        static function getHandler( $type ) {
                global $wgMediaHandlers;
                if ( !isset( $wgMediaHandlers[$type] ) ) {
                        wfDebug( __METHOD__ . ": no handler found for $type.\n");
                        return false;
                }
                $class = $wgMediaHandlers[$type];
                if ( !isset( self::$handlers[$class] ) ) {
                        self::$handlers[$class] = new $class;
                        if ( !self::$handlers[$class]->isEnabled() ) {
                                self::$handlers[$class] = false;
                        }
                }
                return self::$handlers[$class];
        }

        /**
         * 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 $name
         * @param $value
         */
        abstract function validateParam( $name, $value );

        /**
         * Merge a parameter array into a string appropriate for inclusion in filenames
         *
         * @param $params array
         */
        abstract function makeParamString( $params );

        /**
         * Parse a param string made with makeParamString back into an array
         *
         * @param $str string
         */
        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 $image
         * @param $params
         */
        abstract function normaliseParams( $image, &$params );

        /**
         * Get an image size array like that returned by getimagesize(), or false if it
         * can't be determined.
         *
         * @param $image File: the image object, or false if there isn't one
         * @param $path String: the filename
         * @return Array Follow the format of PHP getimagesize() internal function. See http://www.php.net/getimagesize
         */
        abstract function getImageSize( $image, $path );

        /**
         * Get handler-specific metadata which will be saved in the img_metadata field.
         *
         * @param $image File: the image object, or false if there isn't one.
         *   Warning, FSFile::getPropsFromPath might pass an (object)array() instead (!)
         * @param $path String: the filename
         * @return String
         */
        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 ForiegnApiRepo 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 () {
                $version = Array( '2' ); // core metadata version
                wfRunHooks('GetMetadataVersion', Array(&$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 $metadata Mixed String or Array metadata array (serialized if string)
        * @param $version Integer 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.
                        wfSuppressWarnings();
                        $ret = unserialize( $metadata );
                        wfRestoreWarnings();
                        return $ret;
                }
                return $metadata;
        }

        /**
         * Get a string describing the type of metadata, for display purposes.
         *
         * @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,
         * MediaHanlder::METADATA_COMPATIBLE if metadata is old but backwards
         * compatible (which may or may not trigger a metadata reload).
         * @return bool
         */
        function isMetadataValid( $image, $metadata ) {
                return self::METADATA_GOOD;
        }


        /**
         * 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().
         * @return bool
         */
        function getScriptedTransform( $image, $script, $params ) {
                return false;
        }

        /**
         * Get a MediaTransformOutput object representing the transformed output. Does not
         * actually do the transform.
         *
         * @param $image File: the image object
         * @param $dstPath String: filesystem destination path
         * @param $dstUrl String: Destination URL to use in output HTML
         * @param $params Array: 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 $image File: the image object
         * @param $dstPath String: filesystem destination path
         * @param $dstUrl String: destination URL to use in output HTML
         * @param $params Array: arbitrary set of parameters validated by $this->validateParam()
         * @param $flags Integer: 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
         * @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 );
        }

        /**
         * True if the handled types can be transformed
         * @return bool
         */
        function canRender( $file ) { return true; }
        /**
         * True if handled types cannot be displayed directly in a browser
         * but can be rendered
         * @return bool
         */
        function mustRender( $file ) { return false; }
        /**
         * True if the type has multi-page capabilities
         * @return bool
         */
        function isMultiPage( $file ) { return false; }
        /**
         * Page count for a multi-page document, false if unsupported or unknown
         * @return bool
         */
        function pageCount( $file ) { return false; }
        /**
         * The material is vectorized and thus scaling is lossless
         * @return bool
         */
        function isVectorized( $file ) { return false; }
        /**
         * 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 or if the document is not multi-page.
         *
         * @param $image File
         * @return array
         */
        function getPageDimensions( $image, $page ) {
                $gis = $this->getImageSize( $image, $image->getLocalRefPath() );
                return array(
                        'width' => $gis[0],
                        'height' => $gis[1]
                );
        }

        /**
         * Generic getter for text layer.
         * Currently overloaded by PDF and DjVu handlers
         * @return bool
         */
        function getPageText( $image, $page ) {
                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: I don't really like this interface, it's not very flexible
         * I think 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.
         * @return bool
         */
        function formatMetadata( $image ) {
                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 $metadataArray Array metadata array
         * @return array for use displaying metadata.
         */
        function formatMetadataHelper( $metadataArray ) {
                 $result = array(
                        'visible' => array(),
                        'collapsed' => array()
                );

                $formatted = FormatMetadata::getFormattedData( $metadataArray );
                // 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 of strings
         * @access protected
         */
        function visibleMetadataFields() {
                $fields = array();
                $lines = explode( "\n", wfMsgForContent( 'metadata-fields' ) );
                foreach( $lines as $line ) {
                        $matches = array();
                        if( preg_match( '/^\\*\s*(.*?)\s*$/', $line, $matches ) ) {
                                $fields[] = $matches[1];
                        }
                }
                $fields = array_map( 'strtolower', $fields );
                return $fields;
        }


        /**
         * 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 $visibility string ('visible' or 'collapsed') if this value is hidden
         * by default.
         * @param $type String type of metadata tag (currently always 'exif')
         * @param $id String the name of the metadata tag (like 'artist' for example).
         * its name in the table displayed is the message "$type-$id" (Ex exif-artist ).
         * @param $value String 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 $param String 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
                );
        }

        /**
         * @param $file File
         * @return string
         */
        function getShortDesc( $file ) {
                global $wgLang;
                return htmlspecialchars( $wgLang->formatSize( $file->getSize() ) );
        }

        /**
         * @param $file File
         * @return string
         */
        function getLongDesc( $file ) {
                global $wgLang;
                return wfMessage( 'file-info', htmlspecialchars( $wgLang->formatSize( $file->getSize() ) ),
                        $file->getMimeType() )->parse();
        }

        /**
         * @param $file File
         * @return string
         */
        static function getGeneralShortDesc( $file ) {
                global $wgLang;
                return $wgLang->formatSize( $file->getSize() );
        }

        /**
         * @param $file File
         * @return string
         */
        static function getGeneralLongDesc( $file ) {
                global $wgLang;
                return wfMessage( 'file-info', $wgLang->formatSize( $file->getSize() ),
                        $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 $boxWidth Integer Width of the thumbnail box.
         * @param $boxHeight Integer Height of the thumbnail box.
         * @param $maxHeight Integer Maximum height expected for the thumbnail.
         * @return Integer.
         */
        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;
                }
        }

        function getDimensionsString( $file ) {
                return '';
        }

        /**
         * Modify the parser object post-transform
         */
        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 $fileName string The local path to the file.
         * @return Status object
         */
        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 $dstPath string The location of the suspect file
         * @param $retval int 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
         * 
         * @param array $files
         * @param array $options
         */
        public function filterThumbnailPurgeList( &$files, $options ) {
                // Do nothing
        }
}

/**
 * Media handler abstract base class for images
 *
 * @ingroup Media
 */
abstract class ImageHandler extends MediaHandler {

        /**
         * @param $file File
         * @return bool
         */
        function canRender( $file ) {
                return ( $file->getWidth() && $file->getHeight() );
        }

        function getParamMap() {
                return array( 'img_width' => 'width' );
        }

        function validateParam( $name, $value ) {
                if ( in_array( $name, array( 'width', 'height' ) ) ) {
                        if ( $value <= 0 ) {
                                return false;
                        } else {
                                return true;
                        }
                } else {
                        return false;
                }
        }

        function makeParamString( $params ) {
                if ( isset( $params['physicalWidth'] ) ) {
                        $width = $params['physicalWidth'];
                } elseif ( isset( $params['width'] ) ) {
                        $width = $params['width'];
                } else {
                        throw new MWException( 'No width specified to '.__METHOD__ );
                }
                # Removed for ProofreadPage
                #$width = intval( $width );
                return "{$width}px";
        }

        function parseParamString( $str ) {
                $m = false;
                if ( preg_match( '/^(\d+)px$/', $str, $m ) ) {
                        return array( 'width' => $m[1] );
                } else {
                        return false;
                }
        }

        function getScriptParams( $params ) {
                return array( 'width' => $params['width'] );
        }

        /**
         * @param $image File
         * @param  $params
         * @return bool
         */
        function normaliseParams( $image, &$params ) {
                $mimeType = $image->getMimeType();

                if ( !isset( $params['width'] ) ) {
                        return false;
                }

                if ( !isset( $params['page'] ) ) {
                        $params['page'] = 1;
                } else  {
                        if ( $params['page'] > $image->pageCount() ) {
                                $params['page'] = $image->pageCount();
                        }

                        if ( $params['page'] < 1 ) {
                                $params['page'] = 1;
                        }
                }

                $srcWidth = $image->getWidth( $params['page'] );
                $srcHeight = $image->getHeight( $params['page'] );

                if ( isset( $params['height'] ) && $params['height'] != -1 ) {
                        # Height & width were both set
                        if ( $params['width'] * $srcHeight > $params['height'] * $srcWidth ) {
                                # Height is the relative smaller dimension, so scale width accordingly
                                $params['width'] = self::fitBoxWidth( $srcWidth, $srcHeight, $params['height'] );

                                if ( $params['width'] == 0 ) {
                                        # Very small image, so we need to rely on client side scaling :(
                                        $params['width'] = 1;
                                }

                                $params['physicalWidth'] = $params['width'];
                        } else {
                                # Height was crap, unset it so that it will be calculated later
                                unset( $params['height'] );
                        }
                }

                if ( !isset( $params['physicalWidth'] ) ) {
                        # Passed all validations, so set the physicalWidth
                        $params['physicalWidth'] = $params['width'];
                }

                # Because thumbs are only referred to by width, the height always needs
                # to be scaled by the width to keep the thumbnail sizes consistent,
                # even if it was set inside the if block above
                $params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight,
                        $params['physicalWidth'] );

                # Set the height if it was not validated in the if block higher up
                if ( !isset( $params['height'] ) || $params['height'] == -1 ) {
                        $params['height'] = $params['physicalHeight'];
                }


                if ( !$this->validateThumbParams( $params['physicalWidth'],
                                $params['physicalHeight'], $srcWidth, $srcHeight, $mimeType ) ) {
                        return false;
                }
                return true;
        }

        /**
         * Validate thumbnail parameters and fill in the correct height
         *
         * @param $width Integer: specified width (input/output)
         * @param $height Integer: height (output only)
         * @param $srcWidth Integer: width of the source image
         * @param $srcHeight Integer: height of the source image
         * @param $mimeType
         * @return bool False to indicate that an error should be returned to the user.
         */
        function validateThumbParams( &$width, &$height, $srcWidth, $srcHeight, $mimeType ) {
                $width = intval( $width );

                # Sanity check $width
                if( $width <= 0) {
                        wfDebug( __METHOD__.": Invalid destination width: $width\n" );
                        return false;
                }
                if ( $srcWidth <= 0 ) {
                        wfDebug( __METHOD__.": Invalid source width: $srcWidth\n" );
                        return false;
                }

                $height = File::scaleHeight( $srcWidth, $srcHeight, $width );
                if ( $height == 0 ) {
                        # Force height to be at least 1 pixel
                        $height = 1;
                }
                return true;
        }

        /**
         * @param $image File
         * @param  $script
         * @param  $params
         * @return bool|ThumbnailImage
         */
        function getScriptedTransform( $image, $script, $params ) {
                if ( !$this->normaliseParams( $image, $params ) ) {
                        return false;
                }
                $url = $script . '&' . wfArrayToCGI( $this->getScriptParams( $params ) );
                $page = isset( $params['page'] ) ? $params['page'] : false;

                if( $image->mustRender() || $params['width'] < $image->getWidth() ) {
                        return new ThumbnailImage( $image, $url, $params['width'], $params['height'], $page );
                }
        }

        function getImageSize( $image, $path ) {
                wfSuppressWarnings();
                $gis = getimagesize( $path );
                wfRestoreWarnings();
                return $gis;
        }

        function isAnimatedImage( $image ) {
                return false;
        }

        /**
         * @param $file File
         * @return string
         */
        function getShortDesc( $file ) {
                global $wgLang;
                $nbytes = htmlspecialchars( $wgLang->formatSize( $file->getSize() ) );
                $widthheight = wfMessage( 'widthheight' )->numParams( $file->getWidth(), $file->getHeight() )->escaped();

                return "$widthheight ($nbytes)";
        }

        /**
         * @param $file File
         * @return string
         */
        function getLongDesc( $file ) {
                global $wgLang;
                $pages = $file->pageCount();
                $size = htmlspecialchars( $wgLang->formatSize( $file->getSize() ) );
                if ( $pages === false || $pages <= 1 ) {
                        $msg = wfMessage( 'file-info-size' )->numParams( $file->getWidth(),
                                $file->getHeight() )->params( $size,
                                $file->getMimeType() )->parse();
                } else {
                        $msg = wfMessage( 'file-info-size-pages' )->numParams( $file->getWidth(),
                                $file->getHeight() )->params( $size,
                                $file->getMimeType() )->numParams( $pages )->parse();
                }
                return $msg;
        }

        /**
         * @param $file File
         * @return string
         */
        function getDimensionsString( $file ) {
                $pages = $file->pageCount();
                if ( $pages > 1 ) {
                        return wfMessage( 'widthheightpage' )->numParams( $file->getWidth(), $file->getHeight(), $pages )->text();
                } else {
                        return wfMessage( 'widthheight' )->numParams( $file->getWidth(), $file->getHeight() )->text();
                }
        }
}