mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
476 lines
12 KiB
PHP
476 lines
12 KiB
PHP
<?php
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/**
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* Manages uploads via HTML forms processed by PHP,
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* uploads to Silverstripe's default upload directory,
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* and either creates a new or uses an existing File-object
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* for syncing with the database.
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*
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* <b>Validation</b>
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*
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* By default, a user can upload files without extension limitations,
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* which can be a security risk if the webserver is not properly secured.
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* Use {@link setAllowedExtensions()} to limit this list,
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* and ensure the "assets/" directory does not execute scripts
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* (see http://doc.silverstripe.org/secure-development#filesystem).
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* {@link File::$allowed_extensions} provides a good start for a list of "safe" extensions.
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*
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* @package framework
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* @subpackage filesystem
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*
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* @todo Allow for non-database uploads
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*/
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class Upload extends Controller {
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private static $allowed_actions = array(
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'index',
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'load'
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);
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/**
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* A File object
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*
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* @var File
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*/
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protected $file;
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/**
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* Validator for this upload field
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*
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* @var Upload_Validator
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*/
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protected $validator;
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/**
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* Information about the temporary file produced
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* by the PHP-runtime.
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*
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* @var array
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*/
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protected $tmpFile;
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/**
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* Replace an existing file rather than renaming the new one.
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*
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* @var boolean
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*/
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protected $replaceFile;
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/**
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* Processing errors that can be evaluated,
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* e.g. by Form-validation.
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*
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* @var array
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*/
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protected $errors = array();
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/**
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* A foldername relative to /assets,
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* where all uploaded files are stored by default.
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*
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* @config
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* @var string
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*/
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private static $uploads_folder = "Uploads";
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public function __construct() {
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parent::__construct();
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$this->validator = new Upload_Validator();
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$this->replaceFile = self::config()->replaceFile;
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}
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/**
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* Get current validator
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*
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* @return Upload_Validator $validator
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*/
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public function getValidator() {
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return $this->validator;
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}
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/**
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* Set a different instance than {@link Upload_Validator}
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* for this upload session.
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*
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* @param object $validator
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*/
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public function setValidator($validator) {
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$this->validator = $validator;
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}
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/**
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* Save an file passed from a form post into this object.
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* File names are filtered through {@link FileNameFilter}, see class documentation
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* on how to influence this behaviour.
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*
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* @param $tmpFile array Indexed array that PHP generated for every file it uploads.
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* @param $folderPath string Folder path relative to /assets
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* @return Boolean|string Either success or error-message.
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*/
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public function load($tmpFile, $folderPath = false) {
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$this->clearErrors();
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if(!$folderPath) $folderPath = $this->config()->uploads_folder;
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if(!is_array($tmpFile)) {
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user_error("Upload::load() Not passed an array. Most likely, the form hasn't got the right enctype",
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E_USER_ERROR);
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}
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if(!$tmpFile['size']) {
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$this->errors[] = _t('File.NOFILESIZE', 'Filesize is zero bytes.');
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return false;
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}
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$valid = $this->validate($tmpFile);
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if(!$valid) return false;
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// @TODO This puts a HUGE limitation on files especially when lots
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// have been uploaded.
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$base = Director::baseFolder();
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$parentFolder = Folder::find_or_make($folderPath);
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// Generate default filename
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$nameFilter = FileNameFilter::create();
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$file = $nameFilter->filter($tmpFile['name']);
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$fileName = basename($file);
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$relativeFilePath = $parentFolder->getRelativePath() . "/$fileName";
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// Create a new file record (or try to retrieve an existing one)
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if(!$this->file) {
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$fileClass = File::get_class_for_file_extension(pathinfo($tmpFile['name'], PATHINFO_EXTENSION));
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if($this->replaceFile) {
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$this->file = File::get()
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->filter(array(
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'Name' => $fileName,
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'ParentID' => $parentFolder ? $parentFolder->ID : 0
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))->First();
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}
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if(!$this->file) $this->file = new $fileClass();
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}
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// if filename already exists, version the filename (e.g. test.gif to test1.gif)
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if(!$this->replaceFile) {
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while(file_exists("$base/$relativeFilePath")) {
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$i = isset($i) ? ($i+1) : 2;
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$oldFilePath = $relativeFilePath;
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// make sure archives retain valid extensions
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if(substr($relativeFilePath, strlen($relativeFilePath) - strlen('.tar.gz')) == '.tar.gz' ||
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substr($relativeFilePath, strlen($relativeFilePath) - strlen('.tar.bz2')) == '.tar.bz2') {
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$relativeFilePath = preg_replace('/[0-9]*(\.tar\.[^.]+$)/', $i . '\\1', $relativeFilePath);
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} else if (strpos($relativeFilePath, '.') !== false) {
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$relativeFilePath = preg_replace('/[0-9]*(\.[^.]+$)/', $i . '\\1', $relativeFilePath);
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} else if (strpos($relativeFilePath, '_') !== false) {
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$relativeFilePath = preg_replace('/_([^_]+$)/', '_'.$i, $relativeFilePath);
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} else {
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$relativeFilePath .= '_'.$i;
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}
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if($oldFilePath == $relativeFilePath && $i > 2) {
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user_error("Couldn't fix $relativeFilePath with $i tries", E_USER_ERROR);
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}
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}
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} else {
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//reset the ownerID to the current member when replacing files
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$this->file->OwnerID = (Member::currentUser() ? Member::currentUser()->ID : 0);
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}
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if(file_exists($tmpFile['tmp_name']) && copy($tmpFile['tmp_name'], "$base/$relativeFilePath")) {
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$this->file->ParentID = $parentFolder ? $parentFolder->ID : 0;
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// This is to prevent it from trying to rename the file
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$this->file->Name = basename($relativeFilePath);
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$this->file->write();
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$this->extend('onAfterLoad', $this->file); //to allow extensions to e.g. create a version after an upload
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return true;
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} else {
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$this->errors[] = _t('File.NOFILESIZE', 'Filesize is zero bytes.');
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return false;
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}
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}
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/**
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* Load temporary PHP-upload into File-object.
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*
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* @param array $tmpFile
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* @param File $file
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* @return Boolean
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*/
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public function loadIntoFile($tmpFile, $file, $folderPath = false) {
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$this->file = $file;
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return $this->load($tmpFile, $folderPath);
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}
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/**
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* @return Boolean
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*/
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public function setReplaceFile($bool) {
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$this->replaceFile = $bool;
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}
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/**
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* @return Boolean
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*/
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public function getReplaceFile() {
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return $this->replaceFile;
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}
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/**
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* Container for all validation on the file
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* (e.g. size and extension restrictions).
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* Is NOT connected to the {Validator} classes,
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* please have a look at {FileField->validate()}
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* for an example implementation of external validation.
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*
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* @param array $tmpFile
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* @return boolean
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*/
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public function validate($tmpFile) {
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$validator = $this->validator;
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$validator->setTmpFile($tmpFile);
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$isValid = $validator->validate();
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if($validator->getErrors()) {
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$this->errors = array_merge($this->errors, $validator->getErrors());
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}
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return $isValid;
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}
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/**
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* Get file-object, either generated from {load()},
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* or manually set.
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*
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* @return File
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*/
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public function getFile() {
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return $this->file;
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}
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/**
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* Set a file-object (similiar to {loadIntoFile()})
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*
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* @param File $file
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*/
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public function setFile($file) {
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$this->file = $file;
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}
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/**
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* Clear out all errors (mostly set by {loadUploaded()})
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*/
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public function clearErrors() {
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$this->errors = array();
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}
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/**
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* Determines wether previous operations caused an error.
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*
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* @return boolean
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*/
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public function isError() {
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return (count($this->errors));
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}
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/**
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* Return all errors that occurred while processing so far
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* (mostly set by {loadUploaded()})
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*
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* @return array
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*/
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public function getErrors() {
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return $this->errors;
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}
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}
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/**
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* @package framework
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* @subpackage filesystem
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*/
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class Upload_Validator {
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/**
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* Information about the temporary file produced
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* by the PHP-runtime.
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*
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* @var array
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*/
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protected $tmpFile;
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protected $errors = array();
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/**
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* Restrict filesize for either all filetypes
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* or a specific extension, with extension-name
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* as array-key and the size-restriction in bytes as array-value.
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*
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* @var array
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*/
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public $allowedMaxFileSize = array();
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/**
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* @var array Collection of extensions.
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* Extension-names are treated case-insensitive.
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*
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* Example:
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* <code>
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* array("jpg","GIF")
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* </code>
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*/
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public $allowedExtensions = array();
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/**
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* Return all errors that occurred while validating
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* the temporary file.
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*
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* @return array
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*/
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public function getErrors() {
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return $this->errors;
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}
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/**
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* Set information about temporary file produced by PHP.
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* @param array $tmpFile
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*/
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public function setTmpFile($tmpFile) {
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$this->tmpFile = $tmpFile;
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}
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/**
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* Get maximum file size for all or specified file extension.
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*
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* @param string $ext
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* @return int Filesize in bytes
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*/
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public function getAllowedMaxFileSize($ext = null) {
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$ext = strtolower($ext);
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if(isset($ext) && isset($this->allowedMaxFileSize[$ext])) {
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return $this->allowedMaxFileSize[$ext];
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} else {
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return (isset($this->allowedMaxFileSize['*'])) ? $this->allowedMaxFileSize['*'] : false;
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}
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}
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/**
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* Set filesize maximums (in bytes).
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* Automatically converts extensions to lowercase
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* for easier matching.
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*
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* Example:
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* <code>
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* array('*' => 200, 'jpg' => 1000)
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* </code>
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*
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* @param array|int $rules
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*/
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public function setAllowedMaxFileSize($rules) {
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if(is_array($rules) && count($rules)) {
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// make sure all extensions are lowercase
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$rules = array_change_key_case($rules, CASE_LOWER);
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$this->allowedMaxFileSize = $rules;
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} elseif((int) $rules > 0) {
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$this->allowedMaxFileSize['*'] = (int)$rules;
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}
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}
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/**
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* @return array
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*/
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public function getAllowedExtensions() {
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return $this->allowedExtensions;
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}
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/**
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* Limit allowed file extensions. Empty by default, allowing all extensions.
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* To allow files without an extension, use an empty string.
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* See {@link File::$allowed_extensions} to get a good standard set of
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* extensions that are typically not harmful in a webserver context.
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* See {@link setAllowedMaxFileSize()} to limit file size by extension.
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*
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* @param array $rules List of extensions
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*/
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public function setAllowedExtensions($rules) {
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if(!is_array($rules)) return false;
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// make sure all rules are lowercase
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foreach($rules as &$rule) $rule = strtolower($rule);
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$this->allowedExtensions = $rules;
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}
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/**
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* Determines if the bytesize of an uploaded
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* file is valid - can be defined on an
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* extension-by-extension basis in {@link $allowedMaxFileSize}
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*
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* @return boolean
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*/
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public function isValidSize() {
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$pathInfo = pathinfo($this->tmpFile['name']);
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$extension = isset($pathInfo['extension']) ? strtolower($pathInfo['extension']) : null;
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$maxSize = $this->getAllowedMaxFileSize($extension);
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return (!$this->tmpFile['size'] || !$maxSize || (int) $this->tmpFile['size'] < $maxSize);
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}
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/**
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* Determines if the temporary file has a valid extension
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* An empty string in the validation map indicates files without an extension.
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* @return boolean
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*/
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public function isValidExtension() {
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$pathInfo = pathinfo($this->tmpFile['name']);
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// Special case for filenames without an extension
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if(!isset($pathInfo['extension'])) {
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return in_array('', $this->allowedExtensions, true);
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} else {
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return (!count($this->allowedExtensions)
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|| in_array(strtolower($pathInfo['extension']), $this->allowedExtensions));
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}
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}
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/**
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* Run through the rules for this validator checking against
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* the temporary file set by {@link setTmpFile()} to see if
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* the file is deemed valid or not.
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*
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* @return boolean
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*/
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public function validate() {
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// we don't validate for empty upload fields yet
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if(!isset($this->tmpFile['name']) || empty($this->tmpFile['name'])) return true;
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$isRunningTests = (class_exists('SapphireTest', false) && SapphireTest::is_running_test());
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if(isset($this->tmpFile['tmp_name']) && !is_uploaded_file($this->tmpFile['tmp_name']) && !$isRunningTests) {
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$this->errors[] = _t('File.NOVALIDUPLOAD', 'File is not a valid upload');
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return false;
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}
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$pathInfo = pathinfo($this->tmpFile['name']);
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// filesize validation
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if(!$this->isValidSize()) {
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$ext = (isset($pathInfo['extension'])) ? $pathInfo['extension'] : '';
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$arg = File::format_size($this->getAllowedMaxFileSize($ext));
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$this->errors[] = _t(
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'File.TOOLARGE',
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'Filesize is too large, maximum {size} allowed',
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'Argument 1: Filesize (e.g. 1MB)',
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array('size' => $arg)
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);
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return false;
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}
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// extension validation
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if(!$this->isValidExtension()) {
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$this->errors[] = _t(
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'File.INVALIDEXTENSION',
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'Extension is not allowed (valid: {extensions})',
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'Argument 1: Comma-separated list of valid extensions',
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array('extensions' => wordwrap(implode(', ', $this->allowedExtensions)))
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);
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return false;
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}
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return true;
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}
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}
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