676 lines
29 KiB
PHP
676 lines
29 KiB
PHP
<?php
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/**
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* GNU social - a federating social network
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*
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* Abstraction for media files
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Media
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* @package GNUsocial
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* @author Robin Millette <robin@millette.info>
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* @author Miguel Dantas <biodantas@gmail.com>
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* @author Zach Copley <zach@status.net>
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* @author Mikael Nordfeldth <mmn@hethane.se>
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* @copyright 2008-2009, 2019 Free Software Foundation http://fsf.org
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link https://www.gnu.org/software/social/
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*/
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defined('GNUSOCIAL') || die();
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/**
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* Class responsible for abstracting media files
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*/
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class MediaFile
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{
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public $id = null;
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public $filepath = null;
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public $filename = null;
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public $fileRecord = null;
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public $fileurl = null;
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public $short_fileurl = null;
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public $mimetype = null;
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/**
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* @param string $filepath The path of the file this media refers to. Required
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* @param string $mimetype The mimetype of the file. Required
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* @param $filehash The hash of the file, if known. Optional
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* @param int|null $id The DB id of the file. Int if known, null if not.
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* If null, it searches for it. If -1, it skips all DB
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* interactions (useful for temporary objects)
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* @throws ClientException
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* @throws NoResultException
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* @throws ServerException
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*/
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public function __construct(string $filepath, string $mimetype, $filehash = null, $id = null)
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{
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$this->filepath = $filepath;
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$this->filename = basename($this->filepath);
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$this->mimetype = $mimetype;
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$this->filehash = self::getHashOfFile($this->filepath, $filehash);
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$this->id = $id;
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// If id is -1, it means we're dealing with a temporary object and don't want to store it in the DB,
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// or add redirects
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if ($this->id !== -1) {
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if (!empty($this->id)) {
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// If we have an id, load it
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$this->fileRecord = new File();
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$this->fileRecord->id = $this->id;
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if (!$this->fileRecord->find(true)) {
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// If we have set an ID, we need that ID to exist!
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throw new NoResultException($this->fileRecord);
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}
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} else {
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// Otherwise, store it
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$this->fileRecord = $this->storeFile();
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}
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$this->fileurl = common_local_url(
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'attachment',
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array('attachment' => $this->fileRecord->id)
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);
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$this->short_fileurl = common_shorten_url($this->fileurl);
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}
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}
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public function attachToNotice(Notice $notice)
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{
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File_to_post::processNew($this->fileRecord, $notice);
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}
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public function getPath()
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{
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return File::path($this->filename);
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}
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public function shortUrl()
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{
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return $this->short_fileurl;
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}
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public function getEnclosure()
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{
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return $this->getFile()->getEnclosure();
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}
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public function delete()
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{
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@unlink($this->filepath);
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}
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public function getFile()
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{
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if (!$this->fileRecord instanceof File) {
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throw new ServerException('File record did not exist for MediaFile');
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}
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return $this->fileRecord;
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}
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/**
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* Calculate the hash of a file.
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*
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* This won't work for files >2GiB because PHP uses only 32bit.
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* @param string $filepath
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* @param string|null $filehash
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* @return string
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* @throws ServerException
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*/
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public static function getHashOfFile(string $filepath, $filehash = null)
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{
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assert(!empty($filepath), __METHOD__ . ": filepath cannot be null");
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if ($filehash === null) {
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// Calculate if we have an older upload method somewhere (Qvitter) that
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// doesn't do this before calling new MediaFile on its local files...
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$filehash = hash_file(File::FILEHASH_ALG, $filepath);
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if ($filehash === false) {
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throw new ServerException('Could not read file for hashing');
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}
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}
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return $filehash;
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}
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/**
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* Retrieve or insert as a file in the DB
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*
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* @return object File
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* @throws ClientException
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* @throws ServerException
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*/
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protected function storeFile()
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{
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try {
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$file = File::getByHash($this->filehash);
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// We're done here. Yes. Already. We assume sha256 won't collide on us anytime soon.
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return $file;
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} catch (NoResultException $e) {
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// Well, let's just continue below.
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}
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$fileurl = common_local_url('attachment_view', array('filehash' => $this->filehash));
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$file = new File;
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$file->filename = $this->filename;
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$file->urlhash = File::hashurl($fileurl);
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$file->url = $fileurl;
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$file->filehash = $this->filehash;
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$file->size = filesize($this->filepath);
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if ($file->size === false) {
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throw new ServerException('Could not read file to get its size');
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}
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$file->date = time();
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$file->mimetype = $this->mimetype;
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$file_id = $file->insert();
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if ($file_id===false) {
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common_log_db_error($file, "INSERT", __FILE__);
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// TRANS: Client exception thrown when a database error was thrown during a file upload operation.
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throw new ClientException(_('There was a database error while saving your file. Please try again.'));
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}
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// Set file geometrical properties if available
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try {
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$image = ImageFile::fromFileObject($file);
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$orig = clone($file);
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$file->width = $image->width;
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$file->height = $image->height;
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$file->update($orig);
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// We have to cleanup after ImageFile, since it
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// may have generated a temporary file from a
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// video support plugin or something.
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// FIXME: Do this more automagically.
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if ($image->getPath() != $file->getPath()) {
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$image->unlink();
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}
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} catch (ServerException $e) {
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// We just couldn't make out an image from the file. This
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// does not have to be UnsupportedMediaException, as we can
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// also get ServerException from files not existing etc.
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}
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return $file;
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}
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/**
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* The maximum allowed file size, as a string
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*/
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public static function maxFileSize()
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{
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$value = self::maxFileSizeInt();
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if ($value > 1024 * 1024) {
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$value = $value/(1024*1024);
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// TRANS: Number of megabytes. %d is the number.
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return sprintf(_m('%dMB', '%dMB', $value), $value);
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} elseif ($value > 1024) {
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$value = $value/1024;
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// TRANS: Number of kilobytes. %d is the number.
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return sprintf(_m('%dkB', '%dkB', $value), $value);
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} else {
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// TRANS: Number of bytes. %d is the number.
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return sprintf(_m('%dB', '%dB', $value), $value);
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}
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}
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/**
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* The maximum allowed file size, as an int
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*/
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public static function maxFileSizeInt() : int
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{
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return common_config('attachments', 'file_quota');
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}
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/**
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* Encodes a file name and a file hash in the new file format, which is used to avoid
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* having an extension in the file, removing trust in extensions, while keeping the original name
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* @throws ClientException
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*/
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public static function encodeFilename(string $original_name, string $filehash, string $ext = null) : string
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{
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if (empty($original_name)) {
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$original_name = _('Untitled attachment');
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}
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// If we're given an extension explicitly, use it, otherwise...
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$ext = $ext ?:
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// get a replacement extension if configured, returns false if it's blocked,
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// null if no extension
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File::getSafeExtension($original_name);
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if ($ext === false) {
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throw new ClientException(_('Blacklisted file extension.'));
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}
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common_debug("EXT: " . print_r($ext, true));
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if (!empty($ext)) {
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// Remove dots if we have them (make sure they're not repeated)
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$ext = preg_replace('/^\.+/', '', $ext);
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$original_name = preg_replace('/\.+.+$/i', ".{$ext}", $original_name);
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}
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$enc_name = bin2hex($original_name);
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return "{$enc_name}-{$filehash}";
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}
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/**
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* Decode the new filename format
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* @return false | null | string on failure, no match (old format) or original file name, respectively
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*/
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public static function decodeFilename(string $encoded_filename)
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{
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$ret = preg_match('/^([^-]+?)-[^-]+$/', $encoded_filename, $matches);
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if ($ret === false) {
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return false;
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} elseif ($ret === 0) {
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return null; // No match
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} else {
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$filename = hex2bin($matches[1]);
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// Matches extension
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if (preg_match('/^(.+?)\.(.+)$/', $filename, $sub_matches) === 1) {
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$ext = $sub_matches[2];
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// Previously, there was a blacklisted extension array, which could have an alternative
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// extension, such as phps, to replace php. We want to turn it back (this is deprecated,
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// as it no longer makes sense, since we don't trust trust files based on extension,
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// but keep the feature)
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$blacklist = common_config('attachments', 'extblacklist');
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if (is_array($blacklist)) {
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foreach ($blacklist as $upload_ext => $safe_ext) {
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if ($ext === $safe_ext) {
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$ext = $upload_ext;
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break;
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}
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}
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}
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return "{$sub_matches[1]}.{$ext}";
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} else {
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// No extension, don't bother trying to replace it
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return $filename;
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}
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}
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}
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/**
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* Create a new MediaFile or ImageFile object from an upload
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*
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* Tries to set the mimetype correctly, using the most secure method available and rejects the file otherwise.
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* In case the upload is an image, this function returns an new ImageFile (which extends MediaFile)
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* The filename has a new format:
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* bin2hex("{$original_name}.{$ext}")."-{$filehash}"
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* This format should be respected. Notice the dash, which is important to distinguish it from the previous
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* format ("{$hash}.{$ext}")
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*
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* @param string $param
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* @param Profile|null $scoped
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* @return ImageFile|MediaFile
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* @throws ClientException
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* @throws NoResultException
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* @throws NoUploadedMediaException
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* @throws ServerException
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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public static function fromUpload(string $param='media', Profile $scoped=null)
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{
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// The existence of the "error" element means PHP has processed it properly even if it was ok.
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if (!isset($_FILES[$param]) || !isset($_FILES[$param]['error'])) {
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throw new NoUploadedMediaException($param);
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}
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switch ($_FILES[$param]['error']) {
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case UPLOAD_ERR_OK: // success, jump out
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break;
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case UPLOAD_ERR_INI_SIZE:
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case UPLOAD_ERR_FORM_SIZE:
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// TRANS: Exception thrown when too large a file is uploaded.
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// TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
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throw new ClientException(sprintf(
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_('That file is too big. The maximum file size is %s.'),
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self::maxFileSize()
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));
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case UPLOAD_ERR_PARTIAL:
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@unlink($_FILES[$param]['tmp_name']);
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// TRANS: Client exception.
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throw new ClientException(_('The uploaded file was only partially uploaded.'));
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case UPLOAD_ERR_NO_FILE:
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// No file; probably just a non-AJAX submission.
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throw new NoUploadedMediaException($param);
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case UPLOAD_ERR_NO_TMP_DIR:
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// TRANS: Client exception thrown when a temporary folder is not present to store a file upload.
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throw new ClientException(_('Missing a temporary folder.'));
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case UPLOAD_ERR_CANT_WRITE:
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// TRANS: Client exception thrown when writing to disk is not possible during a file upload operation.
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throw new ClientException(_('Failed to write file to disk.'));
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case UPLOAD_ERR_EXTENSION:
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// TRANS: Client exception thrown when a file upload operation has been stopped by an extension.
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throw new ClientException(_('File upload stopped by extension.'));
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default:
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common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
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// TRANS: Client exception thrown when a file upload operation has failed with an unknown reason.
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throw new ClientException(_('System error uploading file.'));
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}
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$filehash = strtolower(self::getHashOfFile($_FILES[$param]['tmp_name']));
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try {
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$file = File::getByHash($filehash);
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// If no exception is thrown the file exists locally, so we'll use that and just add redirections.
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// but if the _actual_ locally stored file doesn't exist, getPath will throw FileNotFoundException
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$filepath = $file->getPath();
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$mimetype = $file->mimetype;
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// XXX PHP: Upgrade to PHP 7.1
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// catch (FileNotFoundException | NoResultException $e)
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} catch (Exception $e) {
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// We have to save the upload as a new local file. This is the normal course of action.
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if ($scoped instanceof Profile) {
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// Throws exception if additional size does not respect quota
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// This test is only needed, of course, if we're uploading something new.
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File::respectsQuota($scoped, $_FILES[$param]['size']);
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}
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$mimetype = self::getUploadedMimeType($_FILES[$param]['tmp_name'], $_FILES[$param]['name']);
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$media = common_get_mime_media($mimetype);
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$basename = basename($_FILES[$param]['name']);
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if ($media === 'image') {
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// Use -1 for the id to avoid adding this temporary file to the DB
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$img = new ImageFile(-1, $_FILES[$param]['tmp_name']);
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// Validate the image by reencoding it. Additionally normalizes old formats to PNG,
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// keeping JPEG and GIF untouched
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$outpath = $img->resizeTo($img->filepath);
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$ext = image_type_to_extension($img->preferredType(), false);
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}
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$filename = self::encodeFilename($basename, $filehash, $ext);
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$filepath = File::path($filename);
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if ($media === 'image') {
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$result = rename($outpath, $filepath);
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} else {
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$result = move_uploaded_file($_FILES[$param]['tmp_name'], $filepath);
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}
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if (!$result) {
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// TRANS: Client exception thrown when a file upload operation fails because the file could
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// TRANS: not be moved from the temporary folder to the permanent file location.
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// UX: too specific
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throw new ClientException(_('File could not be moved to destination directory.'));
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}
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if ($media === 'image') {
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return new ImageFile(null, $filepath);
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}
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}
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return new MediaFile($filepath, $mimetype, $filehash);
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}
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public static function fromFilehandle($fh, Profile $scoped=null)
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{
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$stream = stream_get_meta_data($fh);
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// So far we're only handling filehandles originating from tmpfile(),
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// so we can always do hash_file on $stream['uri'] as far as I can tell!
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$filehash = hash_file(File::FILEHASH_ALG, $stream['uri']);
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try {
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$file = File::getByHash($filehash);
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// Already have it, so let's reuse the locally stored File
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// by using getPath we also check whether the file exists
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// and throw a FileNotFoundException with the path if it doesn't.
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$filename = basename($file->getPath());
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$mimetype = $file->mimetype;
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} catch (FileNotFoundException $e) {
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// This happens if the file we have uploaded has disappeared
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// from the local filesystem for some reason. Since we got the
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// File object from a sha256 check in fromFilehandle, it's safe
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// to just copy the uploaded data to disk!
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fseek($fh, 0); // just to be sure, go to the beginning
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// dump the contents of our filehandle to the path from our exception
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// and report error if it failed.
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if (false === file_put_contents($e->path, fread($fh, filesize($stream['uri'])))) {
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// TRANS: Client exception thrown when a file upload operation fails because the file could
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// TRANS: not be moved from the temporary folder to the permanent file location.
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throw new ClientException(_('File could not be moved to destination directory.'));
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}
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if (!chmod($e->path, 0664)) {
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common_log(LOG_ERR, 'Could not chmod uploaded file: '._ve($e->path));
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}
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$filename = basename($file->getPath());
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$mimetype = $file->mimetype;
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} catch (NoResultException $e) {
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if ($scoped instanceof Profile) {
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File::respectsQuota($scoped, filesize($stream['uri']));
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}
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$mimetype = self::getUploadedMimeType($stream['uri']);
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$filename = strtolower($filehash) . '.' . File::guessMimeExtension($mimetype);
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$filepath = File::path($filename);
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$result = copy($stream['uri'], $filepath) && chmod($filepath, 0664);
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if (!$result) {
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common_log(LOG_ERR, 'File could not be moved (or chmodded) from '._ve($stream['uri']) . ' to ' . _ve($filepath));
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// TRANS: Client exception thrown when a file upload operation fails because the file could
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// TRANS: not be moved from the temporary folder to the permanent file location.
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throw new ClientException(_('File could not be moved to destination directory.'));
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}
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}
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return new MediaFile($filename, $mimetype, $filehash);
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}
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/**
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* Attempt to identify the content type of a given file.
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*
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* @param string $filepath filesystem path as string (file must exist)
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* @param bool $originalFilename (optional) for extension-based detection
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* @return string
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*
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* @throws ClientException if type is known, but not supported for local uploads
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* @throws ServerException
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* @fixme this seems to tie a front-end error message in, kinda confusing
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*
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*/
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public static function getUploadedMimeType(string $filepath, $originalFilename=false)
|
|
{
|
|
// We only accept filenames to existing files
|
|
|
|
$mimetype = null;
|
|
|
|
// From CodeIgniter
|
|
// We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii)
|
|
$regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/';
|
|
/**
|
|
* Fileinfo extension - most reliable method
|
|
*
|
|
* Apparently XAMPP, CentOS, cPanel and who knows what
|
|
* other PHP distribution channels EXPLICITLY DISABLE
|
|
* ext/fileinfo, which is otherwise enabled by default
|
|
* since PHP 5.3 ...
|
|
*/
|
|
if (function_exists('finfo_file')) {
|
|
$finfo = @finfo_open(FILEINFO_MIME);
|
|
// It is possible that a FALSE value is returned, if there is no magic MIME database
|
|
// file found on the system
|
|
if (is_resource($finfo)) {
|
|
$mime = @finfo_file($finfo, $filepath);
|
|
finfo_close($finfo);
|
|
/* According to the comments section of the PHP manual page,
|
|
* it is possible that this function returns an empty string
|
|
* for some files (e.g. if they don't exist in the magic MIME database)
|
|
*/
|
|
if (is_string($mime) && preg_match($regexp, $mime, $matches)) {
|
|
$mimetype = $matches[1];
|
|
}
|
|
}
|
|
}
|
|
/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
|
|
* which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
|
|
* was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
|
|
* than mime_content_type() as well, hence the attempts to try calling the command line with
|
|
* three different functions.
|
|
*
|
|
* Notes:
|
|
* - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
|
|
* - many system admins would disable the exec(), shell_exec(), popen() and similar functions
|
|
* due to security concerns, hence the function_usable() checks
|
|
*/
|
|
if (DIRECTORY_SEPARATOR !== '\\') {
|
|
$cmd = 'file --brief --mime '.escapeshellarg($filepath).' 2>&1';
|
|
if (function_exists('exec')) {
|
|
/* This might look confusing, as $mime is being populated with all of the output
|
|
* when set in the second parameter. However, we only need the last line, which is
|
|
* the actual return value of exec(), and as such - it overwrites anything that could
|
|
* already be set for $mime previously. This effectively makes the second parameter a
|
|
* dummy value, which is only put to allow us to get the return status code.
|
|
*/
|
|
$mime = @exec($cmd, $mime, $return_status);
|
|
if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)) {
|
|
$mimetype = $matches[1];
|
|
}
|
|
}
|
|
if (function_exists('shell_exec')) {
|
|
$mime = @shell_exec($cmd);
|
|
if (strlen($mime) > 0) {
|
|
$mime = explode("\n", trim($mime));
|
|
if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) {
|
|
$mimetype = $matches[1];
|
|
}
|
|
}
|
|
}
|
|
if (function_exists('popen')) {
|
|
$proc = @popen($cmd, 'r');
|
|
if (is_resource($proc)) {
|
|
$mime = @fread($proc, 512);
|
|
@pclose($proc);
|
|
if ($mime !== false) {
|
|
$mime = explode("\n", trim($mime));
|
|
if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) {
|
|
$mimetype = $matches[1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Fall back to mime_content_type(), if available (still better than $_FILES[$field]['type'])
|
|
if (function_exists('mime_content_type')) {
|
|
$mimetype = @mime_content_type($filepath);
|
|
// It's possible that mime_content_type() returns FALSE or an empty string
|
|
if ($mimetype == false && strlen($mimetype) > 0) {
|
|
throw new ServerException(_m('Could not determine file\'s MIME type.'));
|
|
}
|
|
}
|
|
|
|
// Unclear types are such that we can't really tell by the auto
|
|
// detect what they are (.bin, .exe etc. are just "octet-stream")
|
|
$unclearTypes = array('application/octet-stream',
|
|
'application/vnd.ms-office',
|
|
'application/zip',
|
|
'text/plain',
|
|
'text/html', // Ironically, Wikimedia Commons' SVG_logo.svg is identified as text/html
|
|
// TODO: for XML we could do better content-based sniffing too
|
|
'text/xml');
|
|
|
|
$supported = common_config('attachments', 'supported');
|
|
|
|
// If we didn't match, or it is an unclear match
|
|
if ($originalFilename && (!$mimetype || in_array($mimetype, $unclearTypes))) {
|
|
try {
|
|
$type = common_supported_filename_to_mime($originalFilename);
|
|
return $type;
|
|
} catch (UnknownExtensionMimeException $e) {
|
|
// FIXME: I think we should keep the file extension here (supported should be === true here)
|
|
} catch (Exception $e) {
|
|
// Extension parsed but no connected mimetype, so $mimetype is our best guess
|
|
}
|
|
}
|
|
|
|
// If $config['attachments']['supported'] equals boolean true, accept any mimetype
|
|
if ($supported === true || array_key_exists($mimetype, $supported)) {
|
|
// FIXME: Don't know if it always has a mimetype here because
|
|
// finfo->file CAN return false on error: http://php.net/finfo_file
|
|
// so if $supported === true, this may return something unexpected.
|
|
return $mimetype;
|
|
}
|
|
|
|
// We can conclude that we have failed to get the MIME type
|
|
$media = common_get_mime_media($mimetype);
|
|
if ('application' !== $media) {
|
|
// TRANS: Client exception thrown trying to upload a forbidden MIME type.
|
|
// TRANS: %1$s is the file type that was denied, %2$s is the application part of
|
|
// TRANS: the MIME type that was denied.
|
|
$hint = sprintf(_('"%1$s" is not a supported file type on this server. ' .
|
|
'Try using another %2$s format.'), $mimetype, $media);
|
|
} else {
|
|
// TRANS: Client exception thrown trying to upload a forbidden MIME type.
|
|
// TRANS: %s is the file type that was denied.
|
|
$hint = sprintf(_('"%s" is not a supported file type on this server.'), $mimetype);
|
|
}
|
|
throw new ClientException($hint);
|
|
}
|
|
|
|
/**
|
|
* Title for a file, to display in the interface (if there's no better title) and
|
|
* for download filenames
|
|
* @param $file File object
|
|
* @returns string
|
|
*/
|
|
public static function getDisplayName(File $file) : string {
|
|
if (empty($file->filename)) {
|
|
return _('Untitled attachment');
|
|
}
|
|
|
|
// New file name format is "{bin2hex(original_name.ext)}-{$hash}"
|
|
$filename = self::decodeFilename($file->filename);
|
|
|
|
// If there was an error in the match, something's wrong with some piece
|
|
// of code (could be a file with utf8 chars in the name)
|
|
$log_error_msg = "Invalid file name for File with id={$file->id} " .
|
|
"({$file->filename}). Some plugin probably did something wrong.";
|
|
if ($filename === false) {
|
|
common_log(LOG_ERR, $log_error_msg);
|
|
} elseif ($filename === null) {
|
|
// The old file name format was "{hash}.{ext}" so we didn't have a name
|
|
// This extracts the extension
|
|
$ret = preg_match('/^.+?\.(.+)$/', $file->filename, $matches);
|
|
if ($ret !== 1) {
|
|
common_log(LOG_ERR, $log_error_msg);
|
|
return _('Untitled attachment');
|
|
}
|
|
$ext = $matches[1];
|
|
// There's a blacklisted extension array, which could have an alternative
|
|
// extension, such as phps, to replace php. We want to turn it back
|
|
// (currently defaulted to empty, but let's keep the feature)
|
|
$blacklist = common_config('attachments', 'extblacklist');
|
|
if (is_array($blacklist)) {
|
|
foreach ($blacklist as $upload_ext => $safe_ext) {
|
|
if ($ext === $safe_ext) {
|
|
$ext = $upload_ext;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
$filename = "untitled.{$ext}";
|
|
}
|
|
return $filename;
|
|
}
|
|
}
|