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https://github.com/moodle/moodle.git
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668 lines
25 KiB
PHP
668 lines
25 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// Moodle 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This plugin is used to access files on server file system
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*
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* @since 2.0
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* @package repository_filesystem
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* @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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require_once($CFG->dirroot . '/repository/lib.php');
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require_once($CFG->libdir . '/filelib.php');
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/**
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* repository_filesystem class
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*
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* Create a repository from your local filesystem
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* *NOTE* for security issue, we use a fixed repository path
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* which is %moodledata%/repository
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*
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* @package repository
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* @copyright 2009 Dongsheng Cai {@link http://dongsheng.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class repository_filesystem extends repository {
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/**
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* The subdirectory of the instance.
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*
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* @var string
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*/
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protected $subdir;
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/**
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* Constructor
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*
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* @param int $repositoryid repository ID
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* @param int $context context ID
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* @param array $options
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*/
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public function __construct($repositoryid, $context = SYSCONTEXTID, $options = array()) {
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parent::__construct($repositoryid, $context, $options);
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$this->subdir = $this->get_option('fs_path');
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}
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/**
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* Get the list of files and directories in that repository.
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*
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* @param string $path to browse.
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* @param string $page page number.
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* @return array list of files and folders.
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*/
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public function get_listing($path = '', $page = '') {
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global $OUTPUT;
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$list = array();
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$list['list'] = array();
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$list['manage'] = false;
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$list['dynload'] = true;
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$list['nologin'] = true;
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$list['nosearch'] = true;
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$list['path'] = array(
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array('name' => get_string('root', 'repository_filesystem'), 'path' => '')
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);
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$path = trim($path, '/');
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if (!$this->is_in_repository($path)) {
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// In case of doubt on the path, reset to default.
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$path = '';
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}
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$abspath = rtrim($this->get_rootpath() . $path, '/') . '/';
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// Construct the breadcrumb.
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$trail = '';
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if ($path !== '') {
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$parts = explode('/', $path);
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if (count($parts) > 1) {
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foreach ($parts as $part) {
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if (!empty($part)) {
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$trail .= '/' . $part;
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$list['path'][] = array('name' => $part, 'path' => $trail);
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}
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}
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} else {
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$list['path'][] = array('name' => $path, 'path' => $path);
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}
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}
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// Retrieve list of files and directories and sort them.
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$fileslist = array();
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$dirslist = array();
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if ($dh = opendir($abspath)) {
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while (($file = readdir($dh)) != false) {
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if ($file != '.' and $file != '..') {
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if (is_file($abspath . $file)) {
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$fileslist[] = $file;
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} else {
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$dirslist[] = $file;
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}
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}
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}
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}
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core_collator::asort($fileslist, core_collator::SORT_NATURAL);
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core_collator::asort($dirslist, core_collator::SORT_NATURAL);
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// Fill the $list['list'].
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foreach ($dirslist as $file) {
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$list['list'][] = array(
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'title' => $file,
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'children' => array(),
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'datecreated' => filectime($abspath . $file),
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'datemodified' => filemtime($abspath . $file),
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'thumbnail' => $OUTPUT->pix_url(file_folder_icon(90))->out(false),
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'path' => $path . '/' . $file
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);
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}
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foreach ($fileslist as $file) {
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$node = array(
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'title' => $file,
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'source' => $path . '/' . $file,
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'size' => filesize($abspath . $file),
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'datecreated' => filectime($abspath . $file),
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'datemodified' => filemtime($abspath . $file),
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'thumbnail' => $OUTPUT->pix_url(file_extension_icon($file, 90))->out(false),
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'icon' => $OUTPUT->pix_url(file_extension_icon($file, 24))->out(false)
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);
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if (file_extension_in_typegroup($file, 'image') && ($imageinfo = @getimagesize($abspath . $file))) {
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// This means it is an image and we can return dimensions and try to generate thumbnail/icon.
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$token = $node['datemodified'] . $node['size']; // To prevent caching by browser.
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$node['realthumbnail'] = $this->get_thumbnail_url($path . '/' . $file, 'thumb', $token)->out(false);
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$node['realicon'] = $this->get_thumbnail_url($path . '/' . $file, 'icon', $token)->out(false);
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$node['image_width'] = $imageinfo[0];
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$node['image_height'] = $imageinfo[1];
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}
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$list['list'][] = $node;
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}
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$list['list'] = array_filter($list['list'], array($this, 'filter'));
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return $list;
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}
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/**
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* To check whether the user is logged in.
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*
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* @return bool
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*/
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public function check_login() {
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return true;
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}
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/**
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* Show the login screen, if required.
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*
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* @return string
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*/
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public function print_login() {
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return true;
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}
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/**
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* Is it possible to do a global search?
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*
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* @return bool
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*/
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public function global_search() {
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return false;
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}
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/**
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* Return file path.
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* @return array
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*/
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public function get_file($file, $title = '') {
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global $CFG;
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$file = ltrim($file, '/');
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if (!$this->is_in_repository($file)) {
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throw new repository_exception('Invalid file requested.');
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}
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$file = $this->get_rootpath() . $file;
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// This is a hack to prevent move_to_file deleting files in local repository.
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$CFG->repository_no_delete = true;
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return array('path' => $file, 'url' => '');
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}
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/**
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* Return the source information
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*
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* @param stdClass $filepath
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* @return string|null
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*/
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public function get_file_source_info($filepath) {
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return $filepath;
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}
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/**
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* Logout from repository instance
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*
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* @return string
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*/
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public function logout() {
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return true;
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}
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/**
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* Return names of the instance options.
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*
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* @return array
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*/
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public static function get_instance_option_names() {
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return array('fs_path', 'relativefiles');
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}
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/**
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* Save settings for repository instance
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*
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* @param array $options settings
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* @return bool
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*/
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public function set_option($options = array()) {
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$options['fs_path'] = clean_param($options['fs_path'], PARAM_PATH);
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$options['relativefiles'] = clean_param($options['relativefiles'], PARAM_INT);
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$ret = parent::set_option($options);
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return $ret;
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}
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/**
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* Edit/Create Instance Settings Moodle form
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*
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* @param moodleform $mform Moodle form (passed by reference)
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*/
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public static function instance_config_form($mform) {
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global $CFG;
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if (has_capability('moodle/site:config', context_system::instance())) {
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$path = $CFG->dataroot . '/repository/';
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if (!is_dir($path)) {
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mkdir($path, $CFG->directorypermissions, true);
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}
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if ($handle = opendir($path)) {
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$fieldname = get_string('path', 'repository_filesystem');
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$choices = array();
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while (false !== ($file = readdir($handle))) {
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if (is_dir($path . $file) && $file != '.' && $file != '..') {
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$choices[$file] = $file;
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$fieldname = '';
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}
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}
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if (empty($choices)) {
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$mform->addElement('static', '', '', get_string('nosubdir', 'repository_filesystem', $path));
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$mform->addElement('hidden', 'fs_path', '');
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$mform->setType('fs_path', PARAM_PATH);
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} else {
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$mform->addElement('select', 'fs_path', $fieldname, $choices);
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$mform->addElement('static', null, '', get_string('information', 'repository_filesystem', $path));
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}
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closedir($handle);
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}
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$mform->addElement('checkbox', 'relativefiles', get_string('relativefiles', 'repository_filesystem'),
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get_string('relativefiles_desc', 'repository_filesystem'));
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$mform->setType('relativefiles', PARAM_INT);
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} else {
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$mform->addElement('static', null, '', get_string('nopermissions', 'error', get_string('configplugin',
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'repository_filesystem')));
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return false;
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}
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}
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/**
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* Create an instance for this plug-in
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*
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* @static
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* @param string $type the type of the repository
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* @param int $userid the user id
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* @param stdClass $context the context
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* @param array $params the options for this instance
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* @param int $readonly whether to create it readonly or not (defaults to not)
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* @return mixed
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*/
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public static function create($type, $userid, $context, $params, $readonly=0) {
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if (has_capability('moodle/site:config', context_system::instance())) {
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return parent::create($type, $userid, $context, $params, $readonly);
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} else {
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require_capability('moodle/site:config', context_system::instance());
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return false;
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}
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}
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/**
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* Validate repository plugin instance form
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*
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* @param moodleform $mform moodle form
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* @param array $data form data
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* @param array $errors errors
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* @return array errors
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*/
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public static function instance_form_validation($mform, $data, $errors) {
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$fspath = clean_param(trim($data['fs_path'], '/'), PARAM_PATH);
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if (empty($fspath) && !is_numeric($fspath)) {
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$errors['fs_path'] = get_string('invalidadminsettingname', 'error', 'fs_path');
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}
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return $errors;
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}
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/**
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* User cannot use the external link to dropbox
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*
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* @return int
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*/
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public function supported_returntypes() {
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return FILE_INTERNAL | FILE_REFERENCE;
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}
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/**
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* Return human readable reference information
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*
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* @param string $reference value of DB field files_reference.reference
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* @param int $filestatus status of the file, 0 - ok, 666 - source missing
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* @return string
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*/
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public function get_reference_details($reference, $filestatus = 0) {
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$details = $this->get_name().': '.$reference;
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if ($filestatus) {
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return get_string('lostsource', 'repository', $details);
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} else {
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return $details;
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}
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}
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public function sync_reference(stored_file $file) {
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if ($file->get_referencelastsync() + 60 > time()) {
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// Does not cost us much to synchronise within our own filesystem, check every 1 minute.
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return false;
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}
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static $issyncing = false;
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if ($issyncing) {
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// Avoid infinite recursion when calling $file->get_filesize() and get_contenthash().
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return;
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}
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$filepath = $this->get_rootpath() . ltrim($file->get_reference(), '/');
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if ($this->is_in_repository($file->get_reference()) && file_exists($filepath) && is_readable($filepath)) {
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$fs = get_file_storage();
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$issyncing = true;
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if (file_extension_in_typegroup($filepath, 'web_image')) {
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$contenthash = sha1_file($filepath);
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if ($file->get_contenthash() == $contenthash) {
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// File did not change since the last synchronisation.
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$filesize = filesize($filepath);
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} else {
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// Copy file into moodle filepool (used to generate an image thumbnail).
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list($contenthash, $filesize, $newfile) = $fs->add_file_to_pool($filepath);
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}
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} else {
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// Update only file size so file will NOT be copied into moodle filepool.
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$contenthash = null;
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$filesize = filesize($filepath);
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}
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$issyncing = false;
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$file->set_synchronized($contenthash, $filesize);
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} else {
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$file->set_missingsource();
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}
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return true;
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}
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/**
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* Repository method to serve the referenced file
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*
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* @see send_stored_file
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*
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* @param stored_file $storedfile the file that contains the reference
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* @param int $lifetime Number of seconds before the file should expire from caches (null means $CFG->filelifetime)
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* @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
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* @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
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* @param array $options additional options affecting the file serving
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*/
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public function send_file($storedfile, $lifetime=null , $filter=0, $forcedownload=false, array $options = null) {
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$reference = $storedfile->get_reference();
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$file = $this->get_rootpath() . ltrim($reference, '/');
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if ($this->is_in_repository($reference) && is_readable($file)) {
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$filename = $storedfile->get_filename();
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if ($options && isset($options['filename'])) {
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$filename = $options['filename'];
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}
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$dontdie = ($options && isset($options['dontdie']));
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send_file($file, $filename, $lifetime , $filter, false, $forcedownload, '', $dontdie);
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} else {
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send_file_not_found();
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}
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}
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/**
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* Is this repository accessing private data?
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*
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* @return bool
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*/
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public function contains_private_data() {
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return false;
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}
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/**
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* Return the rootpath of this repository instance.
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*
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* Trim() is a necessary step to ensure that the subdirectory is not '/'.
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*
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* @return string path
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* @throws repository_exception If the subdir is unsafe, or invalid.
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*/
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public function get_rootpath() {
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global $CFG;
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$subdir = clean_param(trim($this->subdir, '/'), PARAM_PATH);
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$path = $CFG->dataroot . '/repository/' . $this->subdir . '/';
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if ((empty($this->subdir) && !is_numeric($this->subdir)) || $subdir != $this->subdir || !is_dir($path)) {
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throw new repository_exception('The instance is not properly configured, invalid path.');
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}
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return $path;
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}
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/**
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* Checks if $path is part of this repository.
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*
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* Try to prevent $path hacks such as ../ .
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*
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* We do not use clean_param(, PARAM_PATH) here because it also trims down some
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* characters that are allowed, like < > ' . But we do ensure that the directory
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* is safe by checking that it starts with $rootpath.
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*
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* @param string $path relative path to a file or directory in the repo.
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* @return boolean false when not.
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*/
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protected function is_in_repository($path) {
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$rootpath = $this->get_rootpath();
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if (strpos(realpath($rootpath . $path), realpath($rootpath)) !== 0) {
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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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* Returns url of thumbnail file.
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*
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* @param string $filepath current path in repository (dir and filename)
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* @param string $thumbsize 'thumb' or 'icon'
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* @param string $token identifier of the file contents - to prevent browser from caching changed file
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* @return moodle_url
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*/
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protected function get_thumbnail_url($filepath, $thumbsize, $token) {
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return moodle_url::make_pluginfile_url($this->context->id, 'repository_filesystem', $thumbsize, $this->id,
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'/' . trim($filepath, '/') . '/', $token);
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}
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/**
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* Returns the stored thumbnail file, generates it if not present.
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*
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* @param string $filepath current path in repository (dir and filename)
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* @param string $thumbsize 'thumb' or 'icon'
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* @return null|stored_file
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*/
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public function get_thumbnail($filepath, $thumbsize) {
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global $CFG;
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$filepath = trim($filepath, '/');
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$origfile = $this->get_rootpath() . $filepath;
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// As thumbnail filename we use original file content hash.
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if (!$this->is_in_repository($filepath) || !($filecontents = @file_get_contents($origfile))) {
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// File is not found or is not readable.
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return null;
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}
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$filename = sha1($filecontents);
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unset($filecontents);
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// Try to get generated thumbnail for this file.
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$fs = get_file_storage();
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if (!($file = $fs->get_file(SYSCONTEXTID, 'repository_filesystem', $thumbsize, $this->id, '/' . $filepath . '/',
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$filename))) {
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// Thumbnail not found . Generate and store thumbnail.
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require_once($CFG->libdir . '/gdlib.php');
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if ($thumbsize === 'thumb') {
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$size = 90;
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} else {
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$size = 24;
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}
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if (!$data = @generate_image_thumbnail($origfile, $size, $size)) {
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// Generation failed.
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return null;
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}
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$record = array(
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'contextid' => SYSCONTEXTID,
|
|
'component' => 'repository_filesystem',
|
|
'filearea' => $thumbsize,
|
|
'itemid' => $this->id,
|
|
'filepath' => '/' . $filepath . '/',
|
|
'filename' => $filename,
|
|
);
|
|
$file = $fs->create_file_from_string($record, $data);
|
|
}
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* Run in cron for particular repository instance. Removes thumbnails for deleted/modified files.
|
|
*
|
|
* @param stored_file[] $storedfiles
|
|
*/
|
|
public function remove_obsolete_thumbnails($storedfiles) {
|
|
// Group found files by filepath ('filepath' in Moodle file storage is dir+name in filesystem repository).
|
|
$files = array();
|
|
foreach ($storedfiles as $file) {
|
|
if (!isset($files[$file->get_filepath()])) {
|
|
$files[$file->get_filepath()] = array();
|
|
}
|
|
$files[$file->get_filepath()][] = $file;
|
|
}
|
|
|
|
// Loop through all files and make sure the original exists and has the same contenthash.
|
|
$deletedcount = 0;
|
|
foreach ($files as $filepath => $filesinpath) {
|
|
if ($filecontents = @file_get_contents($this->get_rootpath() . trim($filepath, '/'))) {
|
|
// The 'filename' in Moodle file storage is contenthash of the file in filesystem repository.
|
|
$filename = sha1($filecontents);
|
|
foreach ($filesinpath as $file) {
|
|
if ($file->get_filename() !== $filename && $file->get_filename() !== '.') {
|
|
// Contenthash does not match, this is an old thumbnail.
|
|
$deletedcount++;
|
|
$file->delete();
|
|
}
|
|
}
|
|
} else {
|
|
// Thumbnail exist but file not.
|
|
foreach ($filesinpath as $file) {
|
|
if ($file->get_filename() !== '.') {
|
|
$deletedcount++;
|
|
}
|
|
$file->delete();
|
|
}
|
|
}
|
|
}
|
|
if ($deletedcount) {
|
|
mtrace(" instance {$this->id}: deleted $deletedcount thumbnails");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets a file relative to this file in the repository and sends it to the browser.
|
|
*
|
|
* @param stored_file $mainfile The main file we are trying to access relative files for.
|
|
* @param string $relativepath the relative path to the file we are trying to access.
|
|
*/
|
|
public function send_relative_file(stored_file $mainfile, $relativepath) {
|
|
global $CFG;
|
|
// Check if this repository is allowed to use relative linking.
|
|
$allowlinks = $this->supports_relative_file();
|
|
if (!empty($allowlinks)) {
|
|
// Get path to the mainfile.
|
|
$mainfilepath = $mainfile->get_source();
|
|
|
|
// Strip out filename from the path.
|
|
$filename = $mainfile->get_filename();
|
|
$basepath = strstr($mainfilepath, $filename, true);
|
|
|
|
$fullrelativefilepath = realpath($this->get_rootpath().$basepath.$relativepath);
|
|
|
|
// Sanity check to make sure this path is inside this repository and the file exists.
|
|
if (strpos($fullrelativefilepath, $this->get_rootpath()) === 0 && file_exists($fullrelativefilepath)) {
|
|
send_file($fullrelativefilepath, basename($relativepath), null, 0);
|
|
}
|
|
}
|
|
send_file_not_found();
|
|
}
|
|
|
|
/**
|
|
* helper function to check if the repository supports send_relative_file.
|
|
*
|
|
* @return true|false
|
|
*/
|
|
public function supports_relative_file() {
|
|
return $this->get_option('relativefiles');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generates and sends the thumbnail for an image in filesystem.
|
|
*
|
|
* @param stdClass $course course object
|
|
* @param stdClass $cm course module object
|
|
* @param stdClass $context context object
|
|
* @param string $filearea file area
|
|
* @param array $args extra arguments
|
|
* @param bool $forcedownload whether or not force download
|
|
* @param array $options additional options affecting the file serving
|
|
* @return bool
|
|
*/
|
|
function repository_filesystem_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
|
|
global $OUTPUT, $CFG;
|
|
// Allowed filearea is either thumb or icon - size of the thumbnail.
|
|
if ($filearea !== 'thumb' && $filearea !== 'icon') {
|
|
return false;
|
|
}
|
|
|
|
// As itemid we pass repository instance id.
|
|
$itemid = array_shift($args);
|
|
// Filename is some token that we can ignore (used only to make sure browser does not serve cached copy when file is changed).
|
|
array_pop($args);
|
|
// As filepath we use full filepath (dir+name) of the file in this instance of filesystem repository.
|
|
$filepath = implode('/', $args);
|
|
|
|
// Make sure file exists in the repository and is accessible.
|
|
$repo = repository::get_repository_by_id($itemid, $context);
|
|
$repo->check_capability();
|
|
// Find stored or generated thumbnail.
|
|
if (!($file = $repo->get_thumbnail($filepath, $filearea))) {
|
|
// Generation failed, redirect to default icon for file extension.
|
|
redirect($OUTPUT->pix_url(file_extension_icon($file, 90)));
|
|
}
|
|
// The thumbnails should not be changing much, but maybe the default lifetime is too long.
|
|
$lifetime = $CFG->filelifetime;
|
|
if ($lifetime > 60*10) {
|
|
$lifetime = 60*10;
|
|
}
|
|
send_stored_file($file, $lifetime, 0, $forcedownload, $options);
|
|
}
|
|
|
|
/**
|
|
* Cron callback for repository_filesystem. Deletes the thumbnails for deleted or changed files.
|
|
*/
|
|
function repository_filesystem_cron() {
|
|
$fs = get_file_storage();
|
|
// Find all generated thumbnails and group them in array by itemid (itemid == repository instance id).
|
|
$allfiles = array_merge(
|
|
$fs->get_area_files(SYSCONTEXTID, 'repository_filesystem', 'thumb'),
|
|
$fs->get_area_files(SYSCONTEXTID, 'repository_filesystem', 'icon')
|
|
);
|
|
$filesbyitem = array();
|
|
foreach ($allfiles as $file) {
|
|
if (!isset($filesbyitem[$file->get_itemid()])) {
|
|
$filesbyitem[$file->get_itemid()] = array();
|
|
}
|
|
$filesbyitem[$file->get_itemid()][] = $file;
|
|
}
|
|
// Find all instances of repository_filesystem.
|
|
$instances = repository::get_instances(array('type' => 'filesystem'));
|
|
// Loop through all itemids of generated thumbnails.
|
|
foreach ($filesbyitem as $itemid => $files) {
|
|
if (!isset($instances[$itemid]) || !($instances[$itemid] instanceof repository_filesystem)) {
|
|
// Instance was deleted.
|
|
$fs->delete_area_files(SYSCONTEXTID, 'repository_filesystem', 'thumb', $itemid);
|
|
$fs->delete_area_files(SYSCONTEXTID, 'repository_filesystem', 'icon', $itemid);
|
|
mtrace(" instance $itemid does not exist: deleted all thumbnails");
|
|
} else {
|
|
// Instance has some generated thumbnails, check that they are not outdated.
|
|
$instances[$itemid]->remove_obsolete_thumbnails($files);
|
|
}
|
|
}
|
|
} |