Validation
*
* By default, a user can upload files without extension limitations,
* which can be a security risk if the webserver is not properly secured.
* Use {@link setAllowedExtensions()} to limit this list,
* and ensure the "assets/" directory does not execute scripts
* (see http://doc.silverstripe.org/secure-development#filesystem).
* {@link File::$allowed_extensions} provides a good start for a list of "safe" extensions.
*
* @package framework
* @subpackage filesystem
*
* @todo Allow for non-database uploads
*/
class Upload extends Controller {
private static $allowed_actions = array(
'index',
'load'
);
/**
* A File object
*
* @var File
*/
protected $file;
/**
* Validator for this upload field
*
* @var Upload_Validator
*/
protected $validator;
/**
* Information about the temporary file produced
* by the PHP-runtime.
*
* @var array
*/
protected $tmpFile;
/**
* Replace an existing file rather than renaming the new one.
*
* @var boolean
*/
protected $replaceFile;
/**
* Processing errors that can be evaluated,
* e.g. by Form-validation.
*
* @var array
*/
protected $errors = array();
/**
* A foldername relative to /assets,
* where all uploaded files are stored by default.
*
* @config
* @var string
*/
private static $uploads_folder = "Uploads";
public function __construct() {
parent::__construct();
$this->validator = Injector::inst()->create('Upload_Validator');
$this->replaceFile = self::config()->replaceFile;
}
/**
* Get current validator
*
* @return Upload_Validator $validator
*/
public function getValidator() {
return $this->validator;
}
/**
* Set a different instance than {@link Upload_Validator}
* for this upload session.
*
* @param object $validator
*/
public function setValidator($validator) {
$this->validator = $validator;
}
/**
* Save an file passed from a form post into this object.
* File names are filtered through {@link FileNameFilter}, see class documentation
* on how to influence this behaviour.
*
* @param $tmpFile array Indexed array that PHP generated for every file it uploads.
* @param $folderPath string Folder path relative to /assets
* @return Boolean|string Either success or error-message.
*/
public function load($tmpFile, $folderPath = false) {
$this->clearErrors();
if(!$folderPath) $folderPath = $this->config()->uploads_folder;
if(!is_array($tmpFile)) {
user_error("Upload::load() Not passed an array. Most likely, the form hasn't got the right enctype",
E_USER_ERROR);
}
if(!$tmpFile['size']) {
$this->errors[] = _t('File.NOFILESIZE', 'Filesize is zero bytes.');
return false;
}
$valid = $this->validate($tmpFile);
if(!$valid) return false;
// @TODO This puts a HUGE limitation on files especially when lots
// have been uploaded.
$base = Director::baseFolder();
$parentFolder = Folder::find_or_make($folderPath);
// Generate default filename
$nameFilter = FileNameFilter::create();
$file = $nameFilter->filter($tmpFile['name']);
$fileName = basename($file);
$relativeFolderPath = $parentFolder
? $parentFolder->getRelativePath()
: ASSETS_DIR . '/';
$relativeFilePath = $relativeFolderPath . $fileName;
// Create a new file record (or try to retrieve an existing one)
if(!$this->file) {
$fileClass = File::get_class_for_file_extension(pathinfo($tmpFile['name'], PATHINFO_EXTENSION));
$this->file = new $fileClass();
}
if(!$this->file->ID && $this->replaceFile) {
$fileClass = $this->file->class;
$file = File::get()
->filter(array(
'ClassName' => $fileClass,
'Name' => $fileName,
'ParentID' => $parentFolder ? $parentFolder->ID : 0
))->First();
if($file) {
$this->file = $file;
}
}
// if filename already exists, version the filename (e.g. test.gif to test2.gif, test2.gif to test3.gif)
if(!$this->replaceFile) {
$fileSuffixArray = explode('.', $fileName);
$fileTitle = array_shift($fileSuffixArray);
$fileSuffix = !empty($fileSuffixArray)
? '.' . implode('.', $fileSuffixArray)
: null;
// make sure files retain valid extensions
$oldFilePath = $relativeFilePath;
$relativeFilePath = $relativeFolderPath . $fileTitle . $fileSuffix;
if($oldFilePath !== $relativeFilePath) {
user_error("Couldn't fix $relativeFilePath", E_USER_ERROR);
}
while(file_exists("$base/$relativeFilePath")) {
$i = isset($i) ? ($i+1) : 2;
$oldFilePath = $relativeFilePath;
$pattern = '/([0-9]+$)/';
if(preg_match($pattern, $fileTitle)) {
$fileTitle = preg_replace($pattern, $i, $fileTitle);
} else {
$fileTitle .= $i;
}
$relativeFilePath = $relativeFolderPath . $fileTitle . $fileSuffix;
if($oldFilePath == $relativeFilePath && $i > 2) {
user_error("Couldn't fix $relativeFilePath with $i tries", E_USER_ERROR);
}
}
} else {
//reset the ownerID to the current member when replacing files
$this->file->OwnerID = (Member::currentUser() ? Member::currentUser()->ID : 0);
}
if(file_exists($tmpFile['tmp_name']) && copy($tmpFile['tmp_name'], "$base/$relativeFilePath")) {
$this->file->ParentID = $parentFolder ? $parentFolder->ID : 0;
// This is to prevent it from trying to rename the file
$this->file->Name = basename($relativeFilePath);
$this->file->write();
$this->file->onAfterUpload();
$this->extend('onAfterLoad', $this->file); //to allow extensions to e.g. create a version after an upload
return true;
} else {
$this->errors[] = _t('File.NOFILESIZE', 'Filesize is zero bytes.');
return false;
}
}
/**
* Load temporary PHP-upload into File-object.
*
* @param array $tmpFile
* @param File $file
* @return Boolean
*/
public function loadIntoFile($tmpFile, $file, $folderPath = false) {
$this->file = $file;
return $this->load($tmpFile, $folderPath);
}
/**
* @return Boolean
*/
public function setReplaceFile($bool) {
$this->replaceFile = $bool;
}
/**
* @return Boolean
*/
public function getReplaceFile() {
return $this->replaceFile;
}
/**
* Container for all validation on the file
* (e.g. size and extension restrictions).
* Is NOT connected to the {Validator} classes,
* please have a look at {FileField->validate()}
* for an example implementation of external validation.
*
* @param array $tmpFile
* @return boolean
*/
public function validate($tmpFile) {
$validator = $this->validator;
$validator->setTmpFile($tmpFile);
$isValid = $validator->validate();
if($validator->getErrors()) {
$this->errors = array_merge($this->errors, $validator->getErrors());
}
return $isValid;
}
/**
* Get file-object, either generated from {load()},
* or manually set.
*
* @return File
*/
public function getFile() {
return $this->file;
}
/**
* Set a file-object (similiar to {loadIntoFile()})
*
* @param File $file
*/
public function setFile($file) {
$this->file = $file;
}
/**
* Clear out all errors (mostly set by {loadUploaded()})
*/
public function clearErrors() {
$this->errors = array();
}
/**
* Determines wether previous operations caused an error.
*
* @return boolean
*/
public function isError() {
return (count($this->errors));
}
/**
* Return all errors that occurred while processing so far
* (mostly set by {loadUploaded()})
*
* @return array
*/
public function getErrors() {
return $this->errors;
}
}
/**
* @package framework
* @subpackage filesystem
*/
class Upload_Validator {
/**
* Information about the temporary file produced
* by the PHP-runtime.
*
* @var array
*/
protected $tmpFile;
protected $errors = array();
/**
* Restrict filesize for either all filetypes
* or a specific extension, with extension-name
* as array-key and the size-restriction in bytes as array-value.
*
* @var array
*/
public $allowedMaxFileSize = array();
/**
* @var array Collection of extensions.
* Extension-names are treated case-insensitive.
*
* Example:
*
* array("jpg","GIF")
*
*/
public $allowedExtensions = array();
/**
* Return all errors that occurred while validating
* the temporary file.
*
* @return array
*/
public function getErrors() {
return $this->errors;
}
/**
* Set information about temporary file produced by PHP.
* @param array $tmpFile
*/
public function setTmpFile($tmpFile) {
$this->tmpFile = $tmpFile;
}
/**
* Get maximum file size for all or specified file extension.
*
* @param string $ext
* @return int Filesize in bytes
*/
public function getAllowedMaxFileSize($ext = null) {
$ext = strtolower($ext);
if(isset($ext) && isset($this->allowedMaxFileSize[$ext])) {
return $this->allowedMaxFileSize[$ext];
} else {
return (isset($this->allowedMaxFileSize['*'])) ? $this->allowedMaxFileSize['*'] : false;
}
}
/**
* Set filesize maximums (in bytes).
* Automatically converts extensions to lowercase
* for easier matching.
*
* Example:
*
* array('*' => 200, 'jpg' => 1000)
*
*
* @param array|int $rules
*/
public function setAllowedMaxFileSize($rules) {
if(is_array($rules) && count($rules)) {
// make sure all extensions are lowercase
$rules = array_change_key_case($rules, CASE_LOWER);
$this->allowedMaxFileSize = $rules;
} elseif((int) $rules > 0) {
$this->allowedMaxFileSize['*'] = (int)$rules;
}
}
/**
* @return array
*/
public function getAllowedExtensions() {
return $this->allowedExtensions;
}
/**
* Limit allowed file extensions. Empty by default, allowing all extensions.
* To allow files without an extension, use an empty string.
* See {@link File::$allowed_extensions} to get a good standard set of
* extensions that are typically not harmful in a webserver context.
* See {@link setAllowedMaxFileSize()} to limit file size by extension.
*
* @param array $rules List of extensions
*/
public function setAllowedExtensions($rules) {
if(!is_array($rules)) return false;
// make sure all rules are lowercase
foreach($rules as &$rule) $rule = strtolower($rule);
$this->allowedExtensions = $rules;
}
/**
* Determines if the bytesize of an uploaded
* file is valid - can be defined on an
* extension-by-extension basis in {@link $allowedMaxFileSize}
*
* @return boolean
*/
public function isValidSize() {
$pathInfo = pathinfo($this->tmpFile['name']);
$extension = isset($pathInfo['extension']) ? strtolower($pathInfo['extension']) : null;
$maxSize = $this->getAllowedMaxFileSize($extension);
return (!$this->tmpFile['size'] || !$maxSize || (int) $this->tmpFile['size'] < $maxSize);
}
/**
* Determines if the temporary file has a valid extension
* An empty string in the validation map indicates files without an extension.
* @return boolean
*/
public function isValidExtension() {
$pathInfo = pathinfo($this->tmpFile['name']);
// Special case for filenames without an extension
if(!isset($pathInfo['extension'])) {
return in_array('', $this->allowedExtensions, true);
} else {
return (!count($this->allowedExtensions)
|| in_array(strtolower($pathInfo['extension']), $this->allowedExtensions));
}
}
/**
* Run through the rules for this validator checking against
* the temporary file set by {@link setTmpFile()} to see if
* the file is deemed valid or not.
*
* @return boolean
*/
public function validate() {
// we don't validate for empty upload fields yet
if(!isset($this->tmpFile['name']) || empty($this->tmpFile['name'])) return true;
$isRunningTests = (class_exists('SapphireTest', false) && SapphireTest::is_running_test());
if(isset($this->tmpFile['tmp_name']) && !is_uploaded_file($this->tmpFile['tmp_name']) && !$isRunningTests) {
$this->errors[] = _t('File.NOVALIDUPLOAD', 'File is not a valid upload');
return false;
}
$pathInfo = pathinfo($this->tmpFile['name']);
// filesize validation
if(!$this->isValidSize()) {
$ext = (isset($pathInfo['extension'])) ? $pathInfo['extension'] : '';
$arg = File::format_size($this->getAllowedMaxFileSize($ext));
$this->errors[] = _t(
'File.TOOLARGE',
'Filesize is too large, maximum {size} allowed',
'Argument 1: Filesize (e.g. 1MB)',
array('size' => $arg)
);
return false;
}
// extension validation
if(!$this->isValidExtension()) {
$this->errors[] = _t(
'File.INVALIDEXTENSION',
'Extension is not allowed (valid: {extensions})',
'Argument 1: Comma-separated list of valid extensions',
array('extensions' => wordwrap(implode(', ', $this->allowedExtensions)))
);
return false;
}
return true;
}
}