Security * * Caution: It is recommended to disable any script execution in the "assets/" * directory in the webserver configuration, to reduce the risk of exploits. * See http://doc.silverstripe.org/secure-development#filesystem * * Properties * * - "Name": File name (including extension) or folder name. * Should be the same as the actual filesystem. * - "Title": Optional title of the file (for display purposes only). * Defaults to "Name". Note that the Title field of Folder (subclass of File) * is linked to Name, so Name and Title will always be the same. * - "Filename": Path of the file or folder, relative to the webroot. * Usually starts with the "assets/" directory, and has no trailing slash. * Defaults to the "assets/" directory plus "Name" property if not set. * Setting the "Filename" property will override the "Name" property. * The value should be in sync with "ParentID". * - "Content": Typically unused, but handy for a textual representation of * files, e.g. for fulltext indexing of PDF documents. * - "ParentID": Points to a {@link Folder} record. Should be in sync with * "Filename". A ParentID=0 value points to the "assets/" folder, not the webroot. * * Synchronization * * Changes to a File database record can change the filesystem entry, * but not the other way around. If the filesystem path is renamed outside * of SilverStripe, there's no way for the database to recover this linkage. * New physical files on the filesystem can be "discovered" via {@link Filesystem::sync()}, * the equivalent {@link File} and {@link Folder} records are automatically * created by this method. * * Certain property changes within the File API that can cause a "delayed" filesystem change: * The change is enforced in {@link onBeforeWrite()} later on. * - setParentID() * - setFilename() * - setName() * It is recommended that you use {@link write()} directly after setting any of these properties, * otherwise getters like {@link getFullPath()} and {@link getRelativePath()} * will result paths that are inconsistent with the filesystem. * * Caution: Calling {@link delete()} will also delete from the filesystem. * Call {@link deleteDatabaseOnly()} if you want to avoid this. * * Creating Files and Folders * * Typically both files and folders should be created first on the filesystem, * and then reflected in as database records. Folders can be created recursively * from SilverStripe both in the database and filesystem through {@link Folder::findOrMake()}. * Ensure that you always set a "Filename" property when writing to the database, * leaving it out can lead to unexpected results. * * @package framework * @subpackage filesystem */ class File extends DataObject { static $default_sort = "\"Name\""; static $singular_name = "File"; static $plural_name = "Files"; static $db = array( "Name" => "Varchar(255)", "Title" => "Varchar(255)", "Filename" => "Text", "Content" => "Text", // Only applies to files, doesn't inherit for folder 'ShowInSearch' => 'Boolean(1)', ); static $has_one = array( "Parent" => "File", "Owner" => "Member" ); static $has_many = array(); static $many_many = array(); static $defaults = array( "ShowInSearch" => 1, ); static $extensions = array( "Hierarchy", ); /** * @var array List of allowed file extensions, enforced through {@link validate()}. * * Note: if you modify this, you should also change a configuration file in the assets directory. * Otherwise, the files will be able to be uploaded but they won't be able to be served by the * webserver. * * - If you are running Apahce you will need to change assets/.htaccess * - If you are running IIS you will need to change assets/web.config * * Instructions for the change you need to make are included in a comment in the config file. */ public static $allowed_extensions = array( '','html','htm','xhtml','js','css', 'bmp','png','gif','jpg','jpeg','ico','pcx','tif','tiff', 'au','mid','midi','mpa','mp3','ogg','m4a','ra','wma','wav','cda', 'avi','mpg','mpeg','asf','wmv','m4v','mov','mkv','mp4','swf','flv','ram','rm', 'doc','docx','txt','rtf','xls','xlsx','pages', 'ppt','pptx','pps','csv', 'cab','arj','tar','zip','zipx','sit','sitx','gz','tgz','bz2','ace','arc','pkg','dmg','hqx','jar', 'xml','pdf', ); /** * @var array Category identifiers mapped to commonly used extensions. */ static $app_categories = array( 'audio' => array( "aif" ,"au" ,"mid" ,"midi" ,"mp3" ,"ra" ,"ram" ,"rm","mp3" ,"wav" ,"m4a" ,"snd" ,"aifc" ,"aiff" ,"wma" ,"apl", "avr" ,"cda" ,"mp4" ,"ogg" ), 'mov' => array( "mpeg" ,"mpg" ,"m1v" ,"mp2" ,"mpa" ,"mpe" ,"ifo" ,"vob","avi" ,"wmv" ,"asf" ,"m2v" ,"qt" ), 'zip' => array( "arc" ,"rar" ,"tar" ,"gz" ,"tgz" ,"bz2" ,"dmg" ,"jar","ace" ,"arj" ,"bz" ,"cab" ), 'image' => array( "bmp" ,"gif" ,"jpg" ,"jpeg" ,"pcx" ,"tif" ,"png" ,"alpha","als" ,"cel" ,"icon" ,"ico" ,"ps" ), 'flash' => array( 'swf', 'fla' ) ); /** * @var If this is true, then restrictions set in {@link $allowed_max_file_size} and * {@link $allowed_extensions} will be applied to users with admin privileges as * well. */ public static $apply_restrictions_to_admin = true; public static $update_filesystem = true; /** * Cached result of a "SHOW FIELDS" call * in instance_get() for performance reasons. * * @var array */ protected static $cache_file_fields = null; /** * Replace "[file_link id=n]" shortcode with an anchor tag or link to the file. * @param $arguments array Arguments to the shortcode * @param $content string Content of the returned link (optional) * @param $parser object Specify a parser to parse the content (see {@link ShortCodeParser}) * @return string anchor HTML tag if content argument given, otherwise file path link */ public static function link_shortcode_handler($arguments, $content = null, $parser = null) { if(!isset($arguments['id']) || !is_numeric($arguments['id'])) return; if ( !($record = DataObject::get_by_id('File', $arguments['id'])) // Get the file by ID. && !($record = DataObject::get_one('ErrorPage', '"ErrorCode" = \'404\'')) // Link to 404 page directly. ) { return; // There were no suitable matches at all. } // build the HTML tag if($content) { // build some useful meta-data (file type and size) as data attributes $attrs = ' '; if($record instanceof File) { foreach(array( 'class' => 'file', 'data-type' => $record->getExtension(), 'data-size' => $record->getSize() ) as $name => $value) { $attrs .= sprintf('%s="%s" ', $name, $value); } } return sprintf('%s', $record->Link(), rtrim($attrs), $parser->parse($content)); } else { return $record->Link(); } } /** * Find a File object by the given filename. * * @param String $filename Matched against the "Name" property. * @return mixed null if not found, File object of found file */ static function find($filename) { // Get the base file if $filename points to a resampled file $filename = preg_replace('/_resampled\/[^-]+-/', '', $filename); // Split to folders and the actual filename, and traverse the structure. $parts = explode("/", $filename); $parentID = 0; $item = null; foreach($parts as $part) { if($part == ASSETS_DIR && !$parentID) continue; $SQL_part = Convert::raw2sql($part); $item = DataObject::get_one("File", "\"Name\" = '$SQL_part' AND \"ParentID\" = $parentID"); if(!$item) break; $parentID = $item->ID; } return $item; } function Link() { return Director::baseURL() . $this->RelativeLink(); } function RelativeLink() { return $this->Filename; } /** * @deprecated 3.0 Use getTreeTitle() */ function TreeTitle() { Deprecation::notice('3.0', 'Use getTreeTitle() instead.'); return $this->getTreeTitle(); } /** * @return string */ function getTreeTitle() { return Convert::raw2xml($this->Title); } /** * Event handler called before deleting from the database. * You can overload this to clean up or otherwise process data before delete this * record. Don't forget to call {@link parent::onBeforeDelete()}, though! */ protected function onBeforeDelete() { parent::onBeforeDelete(); // ensure that the record is synced with the filesystem before deleting $this->updateFilesystem(); if($this->Filename && $this->Name && file_exists($this->getFullPath()) && !is_dir($this->getFullPath())) { unlink($this->getFullPath()); } } /** * @todo Enforce on filesystem URL level via mod_rewrite * * @return boolean */ function canView($member = null) { if(!$member) $member = Member::currentUser(); $results = $this->extend('canView', $member); if($results && is_array($results)) if(!min($results)) return false; return true; } /** * Returns true if the following conditions are met: * - CMS_ACCESS_AssetAdmin * * @todo Decouple from CMS view access * * @return boolean */ function canEdit($member = null) { if(!$member) $member = Member::currentUser(); $result = $this->extendedCan('canEdit', $member); if($result !== null) return $result; return Permission::checkMember($member, 'CMS_ACCESS_AssetAdmin'); } /** * @return boolean */ function canCreate($member = null) { if(!$member) $member = Member::currentUser(); $result = $this->extendedCan('canCreate', $member); if($result !== null) return $result; return $this->canEdit($member); } /** * @return boolean */ function canDelete($member = null) { if(!$member) $member = Member::currentUser(); $results = $this->extend('canDelete', $member); if($results && is_array($results)) if(!min($results)) return false; return $this->canEdit($member); } /** * Returns the fields to power the edit screen of files in the CMS. * You can modify this FieldList by subclassing folder, or by creating a {@link DataExtension} * and implemeting updateCMSFields(FieldList $fields) on that extension. * * @return FieldList */ function getCMSFields() { // Preview if($this instanceof Image) { $formattedImage = $this->getFormattedImage('SetWidth', Image::$asset_preview_width); $thumbnail = $formattedImage ? $formattedImage->URL : ''; $previewField = new LiteralField("ImageFull", "{$this->Name}\n" ); } else { $previewField = new LiteralField("ImageFull", $this->CMSThumbnail()); } // Upload $uploadField = new UploadField('UploadField','Upload Field'); $uploadField->setConfig('previewMaxWidth', 40); $uploadField->setConfig('previewMaxHeight', 30); $uploadField->setConfig('allowedMaxFileNumber', 1); //$uploadField->setTemplate('FileEditUploadField'); if ($this->ParentID) { $parent = $this->Parent(); if ($parent) { //set the parent that the Upload field should use for uploads $uploadField->setFolderName($parent->getFilename()); $uploadField->setRecord($parent); } } //create the file attributes in a FieldGroup $filePreview = CompositeField::create( CompositeField::create( $previewField )->setName("FilePreviewImage")->addExtraClass('cms-file-info-preview'), CompositeField::create( CompositeField::create( new ReadonlyField("FileType", _t('AssetTableField.TYPE','File type') . ':'), new ReadonlyField("Size", _t('AssetTableField.SIZE','File size') . ':', $this->getSize()), $urlField = new ReadonlyField('ClickableURL', _t('AssetTableField.URL','URL'), sprintf('%s', $this->Link(), $this->RelativeLink()) ), new DateField_Disabled("Created", _t('AssetTableField.CREATED','First uploaded') . ':'), new DateField_Disabled("LastEdited", _t('AssetTableField.LASTEDIT','Last changed') . ':'), new ReadonlyField('BackLinkCount', _t('AssetTableField.BACKLINKCOUNT', 'Used on:'), $this->BackLinkTracking()->Count() . ' ' . _t('AssetTableField.PAGES', 'page(s)')) ) )->setName("FilePreviewData")->addExtraClass('cms-file-info-data') )->setName("FilePreview")->addExtraClass('cms-file-info'); $urlField->dontEscape = true; //get a tree listing with only folder, no files $folderTree = new TreeDropdownField("ParentID", _t('AssetTableField.FOLDER','Folder'), 'Folder'); $folderTree->setChildrenMethod('ChildFolders'); $fields = new FieldList( new TabSet('Root', new Tab('Main', $filePreview, //TODO: make the uploadField replace the existing file // $uploadField, new TextField("Title", _t('AssetTableField.TITLE','Title')), new TextField("Name", _t('AssetTableField.FILENAME','Filename')), new DropdownField("OwnerID", _t('AssetTableField.OWNER','Owner'), Member::mapInCMSGroups()), $folderTree ) ) ); // Folder has its own updateCMSFields hook if(!($this instanceof Folder)) $this->extend('updateCMSFields', $fields); return $fields; } /** * Returns a category based on the file extension. * This can be useful when grouping files by type, * showing icons on filelinks, etc. * Possible group values are: "audio", "mov", "zip", "image". * * @return String */ public function appCategory() { $ext = strtolower($this->Extension); foreach(self::$app_categories as $category => $exts) { if(in_array($ext, $exts)) return $category; } return false; } function CMSThumbnail() { return ''; } /** * Return the relative URL of an icon for the file type, * based on the {@link appCategory()} value. * Images are searched for in "framework/images/app_icons/". * * @return String */ function Icon() { $ext = $this->Extension; if(!Director::fileExists(FRAMEWORK_DIR . "/images/app_icons/{$ext}_32.gif")) { $ext = $this->appCategory(); } if(!Director::fileExists(FRAMEWORK_DIR . "/images/app_icons/{$ext}_32.gif")) { $ext = "generic"; } return FRAMEWORK_DIR . "/images/app_icons/{$ext}_32.gif"; } /** * Should be called after the file was uploaded */ function onAfterUpload() { $this->extend('onAfterUpload'); } /** * Delete the database record (recursively for folders) without touching the filesystem */ public function deleteDatabaseOnly() { if(is_numeric($this->ID)) DB::query("DELETE FROM \"File\" WHERE \"ID\" = $this->ID"); } /** * Make sure the file has a name */ protected function onBeforeWrite() { parent::onBeforeWrite(); // Set default owner if(!$this->ID) $this->OwnerID = (Member::currentUser() ? Member::currentUser()->ID : 0); // Set default name if(!$this->getField('Name')) $this->Name = "new-" . strtolower($this->class); } /** * Set name on filesystem. If the current object is a "Folder", will also update references * to subfolders and contained file records (both in database and filesystem) */ protected function onAfterWrite() { parent::onAfterWrite(); $this->updateFilesystem(); } /** * Moving the file if appropriate according to updated database content. * Throws an Exception if the new file already exists. * * Caution: This method should just be called during a {@link write()} invocation, * as it relies on {@link DataObject->isChanged()}, which is reset after a {@link write()} call. * Might be called as {@link File->updateFilesystem()} from within {@link Folder->updateFilesystem()}, * so it has to handle both files and folders. * * Assumes that the "Filename" property was previously updated, either directly or indirectly. * (it might have been influenced by {@link setName()} or {@link setParentID()} before). */ public function updateFilesystem() { if(!self::$update_filesystem) return false; // Regenerate "Filename", just to be sure $this->setField('Filename', $this->getRelativePath()); // If certain elements are changed, update the filesystem reference if(!$this->isChanged('Filename')) return false; $changedFields = $this->getChangedFields(); $pathBefore = $changedFields['Filename']['before']; $pathAfter = $changedFields['Filename']['after']; // If the file or folder didn't exist before, don't rename - its created if(!$pathBefore) return; $pathBeforeAbs = Director::getAbsFile($pathBefore); $pathAfterAbs = Director::getAbsFile($pathAfter); // TODO Fix Filetest->testCreateWithFilenameWithSubfolder() to enable this // // Create parent folders recursively in database and filesystem // if(!is_a($this, 'Folder')) { // $folder = Folder::findOrMake(dirname($pathAfterAbs)); // if($folder) $this->ParentID = $folder->ID; // } // Check that original file or folder exists, and rename on filesystem if required. // The folder of the path might've already been renamed by Folder->updateFilesystem() // before any filesystem update on contained file or subfolder records is triggered. if(!file_exists($pathAfterAbs)) { if(!is_a($this, 'Folder')) { // Only throw a fatal error if *both* before and after paths don't exist. if(!file_exists($pathBeforeAbs)) throw new Exception("Cannot move $pathBefore to $pathAfter - $pathBefore doesn't exist"); // Check that target directory (not the file itself) exists. // Only check if we're dealing with a file, otherwise the folder will need to be created if(!file_exists(dirname($pathAfterAbs))) throw new Exception("Cannot move $pathBefore to $pathAfter - Directory " . dirname($pathAfter) . " doesn't exist"); } // Rename file or folder $success = rename($pathBeforeAbs, $pathAfterAbs); if(!$success) throw new Exception("Cannot move $pathBeforeAbs to $pathAfterAbs"); } // Update any database references $this->updateLinks($pathBefore, $pathAfter); } /** * Collate selected descendants of this page. * $condition will be evaluated on each descendant, and if it is succeeds, that item will be added * to the $collator array. * @param condition The PHP condition to be evaluated. The page will be called $item * @param collator An array, passed by reference, to collect all of the matching descendants. */ public function collateDescendants($condition, &$collator) { if($children = $this->Children()) { foreach($children as $item) { if(!$condition || eval("return $condition;")) $collator[] = $item; $item->collateDescendants($condition, $collator); } return true; } } /** * Setter function for Name. Automatically sets a default title, * and removes characters that might be invalid on the filesystem. * Also adds a suffix to the name if the filename already exists * on the filesystem, and is associated to a different {@link File} database record * in the same folder. This means "myfile.jpg" might become "myfile-1.jpg". * * Does not change the filesystem itself, please use {@link write()} for this. * * @param String $name */ function setName($name) { $oldName = $this->Name; // It can't be blank, default to Title if(!$name) $name = $this->Title; // Fix illegal characters $filter = FileNameFilter::create(); $name = $filter->filter($name); // We might have just turned it blank, so check again. if(!$name) $name = 'new-folder'; // If it's changed, check for duplicates if($oldName && $oldName != $name) { $base = pathinfo($name, PATHINFO_BASENAME); $ext = self::get_file_extension($name); $suffix = 1; while(DataObject::get_one("File", "\"Name\" = '" . Convert::raw2sql($name) . "' AND \"ParentID\" = " . (int)$this->ParentID)) { $suffix++; $name = "$base-$suffix$ext"; } } // Update title if(!$this->getField('Title')) $this->__set('Title', str_replace(array('-','_'),' ', preg_replace('/\.[^.]+$/', '', $name))); // Update actual field value $this->setField('Name', $name); // Ensure that the filename is updated as well (only in-memory) // Important: Circumvent the getter to avoid infinite loops $this->setField('Filename', $this->getRelativePath()); return $this->getField('Name'); } /** * @param String $old File path relative to the webroot * @param String $new File path relative to the webroot */ protected function updateLinks($old, $new) { $this->extend('updateLinks', $old, $new); } /** * Does not change the filesystem itself, please use {@link write()} for this. */ function setParentID($parentID) { $this->setField('ParentID', (int)$parentID); // Don't change on the filesystem, we'll handle that in onBeforeWrite() $this->setField('Filename', $this->getRelativePath()); return $this->getField('ParentID'); } /** * Gets the absolute URL accessible through the web. * * @uses Director::absoluteBaseURL() * @return string */ function getAbsoluteURL() { return Director::absoluteBaseURL() . $this->getFilename(); } /** * Gets the relative URL accessible through the web. * * @uses Director::baseURL() * @return string */ function getURL() { return Director::baseURL() . $this->getFilename(); } /** * Returns an absolute filesystem path to the file. * Use {@link getRelativePath()} to get the same path relative to the webroot. * * @return String */ function getFullPath() { $baseFolder = Director::baseFolder(); if(strpos($this->getFilename(), $baseFolder) === 0) { // if path is absolute already, just return return $this->getFilename(); } else { // otherwise assume silverstripe-basefolder return Director::baseFolder() . '/' . $this->getFilename(); } } /** * Returns path relative to webroot. * Serves as a "fallback" method to create the "Filename" property if it isn't set. * If no {@link Folder} is set ("ParentID" property), * defaults to a filename relative to the ASSETS_DIR (usually "assets/"). * * @return String */ function getRelativePath() { if($this->ParentID) { $p = DataObject::get_by_id('Folder', $this->ParentID, false); // Don't use the cache, the parent has just been changed if($p && $p->exists()) return $p->getRelativePath() . $this->getField("Name"); else return ASSETS_DIR . "/" . $this->getField("Name"); } else if($this->getField("Name")) { return ASSETS_DIR . "/" . $this->getField("Name"); } else { return ASSETS_DIR; } } /** * @todo Coupling with cms module, remove this method. */ function DeleteLink() { return Director::absoluteBaseURL()."admin/assets/removefile/".$this->ID; } function getFilename() { // Default behaviour: Return field if its set if($this->getField('Filename')) { return $this->getField('Filename'); } else { return ASSETS_DIR . '/'; } } /** * Does not change the filesystem itself, please use {@link write()} for this. */ function setFilename($val) { $this->setField('Filename', $val); // "Filename" is the "master record" (existing on the filesystem), // meaning we have to adjust the "Name" property in the database as well. $this->setField('Name', basename($val)); } /** * Returns the file extension * * @todo This overrides getExtension() in DataObject, but it does something completely different. * This should be renamed to getFileExtension(), but has not been yet as it may break * legacy code. * * @return String */ function getExtension() { return self::get_file_extension($this->getField('Filename')); } /** * Gets the extension of a filepath or filename, * by stripping away everything before the last "dot". * Caution: Only returns the last extension in "double-barrelled" * extensions (e.g. "gz" for "tar.gz"). * * Examples: * - "myfile" returns "" * - "myfile.txt" returns "txt" * - "myfile.tar.gz" returns "gz" * * @param string $filename * @return string */ public static function get_file_extension($filename) { return pathinfo($filename, PATHINFO_EXTENSION); } /** * Return the type of file for the given extension * on the current file name. * * @return string */ function getFileType() { $types = array( 'gif' => 'GIF image - good for diagrams', 'jpg' => 'JPEG image - good for photos', 'jpeg' => 'JPEG image - good for photos', 'png' => 'PNG image - good general-purpose format', 'ico' => 'Icon image', 'tiff' => 'Tagged image format', 'doc' => 'Word document', 'xls' => 'Excel spreadsheet', 'zip' => 'ZIP compressed file', 'gz' => 'GZIP compressed file', 'dmg' => 'Apple disk image', 'pdf' => 'Adobe Acrobat PDF file', 'mp3' => 'MP3 audio file', 'wav' => 'WAV audo file', 'avi' => 'AVI video file', 'mpg' => 'MPEG video file', 'mpeg' => 'MPEG video file', 'js' => 'Javascript file', 'css' => 'CSS file', 'html' => 'HTML file', 'htm' => 'HTML file' ); $ext = $this->getExtension(); return isset($types[$ext]) ? $types[$ext] : 'unknown'; } /** * Returns the size of the file type in an appropriate format. */ function getSize() { $size = $this->getAbsoluteSize(); return ($size) ? self::format_size($size) : false; } /** * Formats a file size (eg: (int)42 becomes string '42 bytes') * @param int $size * @return string */ public static function format_size($size) { if($size < 1024) return $size . ' bytes'; if($size < 1024*10) return (round($size/1024*10)/10). ' KB'; if($size < 1024*1024) return round($size/1024) . ' KB'; if($size < 1024*1024*10) return (round(($size/1024)/1024*10)/10) . ' MB'; if($size < 1024*1024*1024) return round(($size/1024)/1024) . ' MB'; return round($size/(1024*1024*1024)*10)/10 . ' GB'; } /** * Convert a php.ini value (eg: 512M) to bytes * * @param string $phpIniValue * @return int */ public static function ini2bytes($PHPiniValue) { switch(strtolower(substr(trim($PHPiniValue), -1))) { case 'g': $PHPiniValue *= 1024; case 'm': $PHPiniValue *= 1024; case 'k': $PHPiniValue *= 1024; } return $PHPiniValue; } /** * Return file size in bytes. * @return int */ function getAbsoluteSize(){ if(file_exists($this->getFullPath())) { $size = filesize($this->getFullPath()); return $size; } else { return 0; } } public function flushCache($persistant = true) { parent::flushCache($persistant); self::$cache_file_fields = null; } /** * * @param boolean $includerelations a boolean value to indicate if the labels returned include relation fields * */ function fieldLabels($includerelations = true) { $labels = parent::fieldLabels($includerelations); $labels['Name'] = _t('File.Name', 'Name'); $labels['Title'] = _t('File.Title', 'Title'); $labels['Filename'] = _t('File.Filename', 'Filename'); $labels['Filename'] = _t('File.Filename', 'Filename'); $labels['Content'] = _t('File.Content', 'Content'); return $labels; } function validate() { if(File::$apply_restrictions_to_admin || !Permission::check('ADMIN')) { // Extension validation // TODO Merge this with Upload_Validator $extension = $this->getExtension(); $allowed = array_map('strtolower', self::$allowed_extensions); if($extension && !in_array(strtolower($extension), $allowed)) { $exts = $allowed; sort($exts); $message = sprintf( _t( 'File.INVALIDEXTENSION', 'Extension is not allowed (valid: %s)', 'Argument 1: Comma-separated list of valid extensions' ), wordwrap(implode(', ',$exts)) ); return new ValidationResult(false, $message); } } // We aren't validating for an existing "Filename" on the filesystem. // A record should still be saveable even if the underlying record has been removed. return new ValidationResult(true); } /** * @var Array Only use lowercase extensions in here. */ static $class_for_file_extension = array( '*' => 'File', 'jpg' => 'Image', 'jpeg' => 'Image', 'png' => 'Image', 'gif' => 'Image', ); /** * Maps a {@link File} subclass to a specific extension. * By default, files with common image extensions will be created * as {@link Image} instead of {@link File} when using * {@link Folder::constructChild}, {@link Folder::addUploadToFolder}), * and the {@link Upload} class (either directly or through {@link FileField}). * For manually instanciated files please use this mapping getter. * * Caution: Changes to mapping doesn't apply to existing file records in the database. * Also doesn't hook into {@link Object::getCustomClass()}. * * @param String File extension, without dot prefix. Use an asterisk ('*') * to specify a generic fallback if no mapping is found for an extension. * @return String Classname for a subclass of {@link File} */ static function get_class_for_file_extension($ext) { $map = array_change_key_case(self::$class_for_file_extension, CASE_LOWER); return (array_key_exists(strtolower($ext), $map)) ? $map[strtolower($ext)] : $map['*']; } /** * See {@link get_class_for_file_extension()}. * * @param String|array * @param String */ static function set_class_for_file_extension($exts, $class) { if(!is_array($exts)) $exts = array($exts); foreach($exts as $ext) { if(ClassInfo::is_subclass_of($ext, 'File')) { throw new InvalidArgumentException( sprintf('Class "%s" (for extension "%s") is not a valid subclass of File', $class, $ext) ); } self::$class_for_file_extension[$ext] = $class; } } }