/repository/dropbox/lib.php
PHP | 726 lines | 447 code | 50 blank | 229 comment | 71 complexity | 3716d831865033f0e935a433c3dab056 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, LGPL-3.0, GPL-3.0, LGPL-2.1, Apache-2.0, BSD-3-Clause, AGPL-3.0
- <?php
- // This file is part of Moodle - http://moodle.org/
- //
- // Moodle is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // Moodle is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
- /**
- * This plugin is used to access user's dropbox files
- *
- * @since 2.0
- * @package repository_dropbox
- * @copyright 2012 Marina Glancy
- * @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- require_once($CFG->dirroot . '/repository/lib.php');
- require_once(dirname(__FILE__).'/locallib.php');
- /**
- * Repository to access Dropbox files
- *
- * @package repository_dropbox
- * @copyright 2010 Dongsheng Cai
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- class repository_dropbox extends repository {
- /** @var dropbox the instance of dropbox client */
- private $dropbox;
- /** @var array files */
- public $files;
- /** @var bool flag of login status */
- public $logged=false;
- /** @var int maximum size of file to cache in moodle filepool */
- public $cachelimit=null;
- /** @var int cached file ttl */
- private $cachedfilettl = null;
- /**
- * Constructor of dropbox plugin
- *
- * @param int $repositoryid
- * @param stdClass $context
- * @param array $options
- */
- public function __construct($repositoryid, $context = SYSCONTEXTID, $options = array()) {
- global $CFG;
- $options['page'] = optional_param('p', 1, PARAM_INT);
- parent::__construct($repositoryid, $context, $options);
- $this->setting = 'dropbox_';
- $this->dropbox_key = $this->get_option('dropbox_key');
- $this->dropbox_secret = $this->get_option('dropbox_secret');
- // one day
- $this->cachedfilettl = 60 * 60 * 24;
- if (isset($options['access_key'])) {
- $this->access_key = $options['access_key'];
- } else {
- $this->access_key = get_user_preferences($this->setting.'_access_key', '');
- }
- if (isset($options['access_secret'])) {
- $this->access_secret = $options['access_secret'];
- } else {
- $this->access_secret = get_user_preferences($this->setting.'_access_secret', '');
- }
- if (!empty($this->access_key) && !empty($this->access_secret)) {
- $this->logged = true;
- }
- $callbackurl = new moodle_url($CFG->wwwroot.'/repository/repository_callback.php', array(
- 'callback'=>'yes',
- 'repo_id'=>$repositoryid
- ));
- $args = array(
- 'oauth_consumer_key'=>$this->dropbox_key,
- 'oauth_consumer_secret'=>$this->dropbox_secret,
- 'oauth_callback' => $callbackurl->out(false),
- 'api_root' => 'https://api.dropbox.com/1/oauth',
- );
- $this->dropbox = new dropbox($args);
- }
- /**
- * Set access key
- *
- * @param string $access_key
- */
- public function set_access_key($access_key) {
- $this->access_key = $access_key;
- }
- /**
- * Set access secret
- *
- * @param string $access_secret
- */
- public function set_access_secret($access_secret) {
- $this->access_secret = $access_secret;
- }
- /**
- * Check if moodle has got access token and secret
- *
- * @return bool
- */
- public function check_login() {
- return !empty($this->logged);
- }
- /**
- * Generate dropbox login url
- *
- * @return array
- */
- public function print_login() {
- $result = $this->dropbox->request_token();
- set_user_preference($this->setting.'_request_secret', $result['oauth_token_secret']);
- $url = $result['authorize_url'];
- if ($this->options['ajax']) {
- $ret = array();
- $popup_btn = new stdClass();
- $popup_btn->type = 'popup';
- $popup_btn->url = $url;
- $ret['login'] = array($popup_btn);
- return $ret;
- } else {
- echo '<a target="_blank" href="'.$url.'">'.get_string('login', 'repository').'</a>';
- }
- }
- /**
- * Request access token
- *
- * @return array
- */
- public function callback() {
- $token = optional_param('oauth_token', '', PARAM_TEXT);
- $secret = get_user_preferences($this->setting.'_request_secret', '');
- $access_token = $this->dropbox->get_access_token($token, $secret);
- set_user_preference($this->setting.'_access_key', $access_token['oauth_token']);
- set_user_preference($this->setting.'_access_secret', $access_token['oauth_token_secret']);
- }
- /**
- * Get dropbox files
- *
- * @param string $path
- * @param int $page
- * @return array
- */
- public function get_listing($path = '', $page = '1') {
- global $OUTPUT;
- if (empty($path) || $path=='/') {
- $path = '/';
- } else {
- $path = file_correct_filepath($path);
- }
- $encoded_path = str_replace("%2F", "/", rawurlencode($path));
- $list = array();
- $list['list'] = array();
- $list['manage'] = 'https://www.dropbox.com/home';
- $list['dynload'] = true;
- $list['nosearch'] = true;
- $list['logouturl'] = 'https://www.dropbox.com/logout';
- $list['message'] = get_string('logoutdesc', 'repository_dropbox');
- // process breadcrumb trail
- $list['path'] = array(
- array('name'=>get_string('dropbox', 'repository_dropbox'), 'path'=>'/')
- );
- $result = $this->dropbox->get_listing($encoded_path, $this->access_key, $this->access_secret);
- if (!is_object($result) || empty($result)) {
- return $list;
- }
- if (empty($result->path)) {
- $current_path = '/';
- } else {
- $current_path = file_correct_filepath($result->path);
- }
- $trail = '';
- if (!empty($path)) {
- $parts = explode('/', $path);
- if (count($parts) > 1) {
- foreach ($parts as $part) {
- if (!empty($part)) {
- $trail .= ('/'.$part);
- $list['path'][] = array('name'=>$part, 'path'=>$trail);
- }
- }
- } else {
- $list['path'][] = array('name'=>$path, 'path'=>$path);
- }
- }
- if (!empty($result->error)) {
- // reset access key
- set_user_preference($this->setting.'_access_key', '');
- set_user_preference($this->setting.'_access_secret', '');
- throw new repository_exception('repositoryerror', 'repository', '', $result->error);
- }
- if (empty($result->contents) or !is_array($result->contents)) {
- return $list;
- }
- $files = $result->contents;
- $dirslist = array();
- $fileslist = array();
- foreach ($files as $file) {
- if ($file->is_dir) {
- $dirslist[] = array(
- 'title' => substr($file->path, strpos($file->path, $current_path)+strlen($current_path)),
- 'path' => file_correct_filepath($file->path),
- 'date' => strtotime($file->modified),
- 'thumbnail' => $OUTPUT->pix_url(file_folder_icon(64))->out(false),
- 'thumbnail_height' => 64,
- 'thumbnail_width' => 64,
- 'children' => array(),
- );
- } else {
- $thumbnail = null;
- if ($file->thumb_exists) {
- $thumburl = new moodle_url('/repository/dropbox/thumbnail.php',
- array('repo_id' => $this->id,
- 'ctx_id' => $this->context->id,
- 'source' => $file->path,
- 'rev' => $file->rev // include revision to avoid cache problems
- ));
- $thumbnail = $thumburl->out(false);
- }
- $fileslist[] = array(
- 'title' => substr($file->path, strpos($file->path, $current_path)+strlen($current_path)),
- 'source' => $file->path,
- 'size' => $file->bytes,
- 'date' => strtotime($file->modified),
- 'thumbnail' => $OUTPUT->pix_url(file_extension_icon($file->path, 64))->out(false),
- 'realthumbnail' => $thumbnail,
- 'thumbnail_height' => 64,
- 'thumbnail_width' => 64,
- );
- }
- }
- $fileslist = array_filter($fileslist, array($this, 'filter'));
- $list['list'] = array_merge($dirslist, array_values($fileslist));
- return $list;
- }
- /**
- * Displays a thumbnail for current user's dropbox file
- *
- * @param string $string
- */
- public function send_thumbnail($source) {
- $saveas = $this->prepare_file('');
- try {
- $access_key = get_user_preferences($this->setting.'_access_key', '');
- $access_secret = get_user_preferences($this->setting.'_access_secret', '');
- $this->dropbox->set_access_token($access_key, $access_secret);
- $this->dropbox->get_thumbnail($source, $saveas, self::SYNCIMAGE_TIMEOUT);
- $content = file_get_contents($saveas);
- unlink($saveas);
- // set 30 days lifetime for the image. If the image is changed in dropbox it will have
- // different revision number and URL will be different. It is completely safe
- // to cache thumbnail in the browser for a long time
- send_file($content, basename($source), 30*24*60*60, 0, true);
- } catch (Exception $e) {}
- }
- /**
- * Logout from dropbox
- * @return array
- */
- public function logout() {
- set_user_preference($this->setting.'_access_key', '');
- set_user_preference($this->setting.'_access_secret', '');
- $this->access_key = '';
- $this->access_secret = '';
- return $this->print_login();
- }
- /**
- * Set dropbox option
- * @param array $options
- * @return mixed
- */
- public function set_option($options = array()) {
- if (!empty($options['dropbox_key'])) {
- set_config('dropbox_key', trim($options['dropbox_key']), 'dropbox');
- }
- if (!empty($options['dropbox_secret'])) {
- set_config('dropbox_secret', trim($options['dropbox_secret']), 'dropbox');
- }
- if (!empty($options['dropbox_cachelimit'])) {
- $this->cachelimit = (int)trim($options['dropbox_cachelimit']);
- set_config('dropbox_cachelimit', $this->cachelimit, 'dropbox');
- }
- unset($options['dropbox_key']);
- unset($options['dropbox_secret']);
- unset($options['dropbox_cachelimit']);
- $ret = parent::set_option($options);
- return $ret;
- }
- /**
- * Get dropbox options
- * @param string $config
- * @return mixed
- */
- public function get_option($config = '') {
- if ($config==='dropbox_key') {
- return trim(get_config('dropbox', 'dropbox_key'));
- } elseif ($config==='dropbox_secret') {
- return trim(get_config('dropbox', 'dropbox_secret'));
- } elseif ($config==='dropbox_cachelimit') {
- return $this->max_cache_bytes();
- } else {
- $options = parent::get_option();
- $options['dropbox_key'] = trim(get_config('dropbox', 'dropbox_key'));
- $options['dropbox_secret'] = trim(get_config('dropbox', 'dropbox_secret'));
- $options['dropbox_cachelimit'] = $this->max_cache_bytes();
- }
- return $options;
- }
- /**
- * Fixes references in DB that contains user credentials
- *
- * @param string $reference contents of DB field files_reference.reference
- */
- public function fix_old_style_reference($reference) {
- $ref = unserialize($reference);
- if (!isset($ref->url)) {
- $this->dropbox->set_access_token($ref->access_key, $ref->access_secret);
- $ref->url = $this->dropbox->get_file_share_link($ref->path, self::GETFILE_TIMEOUT);
- if (!$ref->url) {
- // some error occurred, do not fix reference for now
- return $reference;
- }
- }
- unset($ref->access_key);
- unset($ref->access_secret);
- $newreference = serialize($ref);
- if ($newreference !== $reference) {
- // we need to update references in the database
- global $DB;
- $params = array(
- 'newreference' => $newreference,
- 'newhash' => sha1($newreference),
- 'reference' => $reference,
- 'hash' => sha1($reference),
- 'repoid' => $this->id
- );
- $refid = $DB->get_field_sql('SELECT id FROM {files_reference}
- WHERE reference = :reference AND referencehash = :hash
- AND repositoryid = :repoid', $params);
- if (!$refid) {
- return $newreference;
- }
- $existingrefid = $DB->get_field_sql('SELECT id FROM {files_reference}
- WHERE reference = :newreference AND referencehash = :newhash
- AND repositoryid = :repoid', $params);
- if ($existingrefid) {
- // the same reference already exists, we unlink all files from it,
- // link them to the current reference and remove the old one
- $DB->execute('UPDATE {files} SET referencefileid = :refid
- WHERE referencefileid = :existingrefid',
- array('refid' => $refid, 'existingrefid' => $existingrefid));
- $DB->delete_records('files_reference', array('id' => $existingrefid));
- }
- // update the reference
- $params['refid'] = $refid;
- $DB->execute('UPDATE {files_reference}
- SET reference = :newreference, referencehash = :newhash
- WHERE id = :refid', $params);
- }
- return $newreference;
- }
- /**
- * Converts a URL received from dropbox API function 'shares' into URL that
- * can be used to download/access file directly
- *
- * @param string $sharedurl
- * @return string
- */
- private function get_file_download_link($sharedurl) {
- return preg_replace('|^(\w*://)www(.dropbox.com)|','\1dl\2',$sharedurl);
- }
- /**
- * Downloads a file from external repository and saves it in temp dir
- *
- * @throws moodle_exception when file could not be downloaded
- *
- * @param string $reference the content of files.reference field or result of
- * function {@link repository_dropbox::get_file_reference()}
- * @param string $saveas filename (without path) to save the downloaded file in the
- * temporary directory, if omitted or file already exists the new filename will be generated
- * @return array with elements:
- * path: internal location of the file
- * url: URL to the source (from parameters)
- */
- public function get_file($reference, $saveas = '') {
- $ref = unserialize($reference);
- $saveas = $this->prepare_file($saveas);
- if (isset($ref->access_key) && isset($ref->access_secret) && isset($ref->path)) {
- $this->dropbox->set_access_token($ref->access_key, $ref->access_secret);
- return $this->dropbox->get_file($ref->path, $saveas, self::GETFILE_TIMEOUT);
- } else if (isset($ref->url)) {
- $c = new curl;
- $url = $this->get_file_download_link($ref->url);
- $result = $c->download_one($url, null, array('filepath' => $saveas, 'timeout' => self::GETFILE_TIMEOUT, 'followlocation' => true));
- $info = $c->get_info();
- if ($result !== true || !isset($info['http_code']) || $info['http_code'] != 200) {
- throw new moodle_exception('errorwhiledownload', 'repository', '', $result);
- }
- return array('path'=>$saveas, 'url'=>$url);
- }
- throw new moodle_exception('cannotdownload', 'repository');
- }
- /**
- * Add Plugin settings input to Moodle form
- *
- * @param moodleform $mform Moodle form (passed by reference)
- * @param string $classname repository class name
- */
- public static function type_config_form($mform, $classname = 'repository') {
- global $CFG;
- parent::type_config_form($mform);
- $key = get_config('dropbox', 'dropbox_key');
- $secret = get_config('dropbox', 'dropbox_secret');
- if (empty($key)) {
- $key = '';
- }
- if (empty($secret)) {
- $secret = '';
- }
- $strrequired = get_string('required');
- $mform->addElement('text', 'dropbox_key', get_string('apikey', 'repository_dropbox'), array('value'=>$key,'size' => '40'));
- $mform->setType('dropbox_key', PARAM_RAW_TRIMMED);
- $mform->addElement('text', 'dropbox_secret', get_string('secret', 'repository_dropbox'), array('value'=>$secret,'size' => '40'));
- $mform->addRule('dropbox_key', $strrequired, 'required', null, 'client');
- $mform->addRule('dropbox_secret', $strrequired, 'required', null, 'client');
- $mform->setType('dropbox_secret', PARAM_RAW_TRIMMED);
- $str_getkey = get_string('instruction', 'repository_dropbox');
- $mform->addElement('static', null, '', $str_getkey);
- $mform->addElement('text', 'dropbox_cachelimit', get_string('cachelimit', 'repository_dropbox'), array('size' => '40'));
- $mform->addRule('dropbox_cachelimit', null, 'numeric', null, 'client');
- $mform->setType('dropbox_cachelimit', PARAM_INT);
- $mform->addElement('static', 'dropbox_cachelimit_info', '', get_string('cachelimit_info', 'repository_dropbox'));
- }
- /**
- * Option names of dropbox plugin
- *
- * @return array
- */
- public static function get_type_option_names() {
- return array('dropbox_key', 'dropbox_secret', 'pluginname', 'dropbox_cachelimit');
- }
- /**
- * Dropbox plugin supports all kinds of files
- *
- * @return array
- */
- public function supported_filetypes() {
- return '*';
- }
- /**
- * User cannot use the external link to dropbox
- *
- * @return int
- */
- public function supported_returntypes() {
- return FILE_INTERNAL | FILE_REFERENCE | FILE_EXTERNAL;
- }
- /**
- * Return file URL for external link
- *
- * @param string $reference the result of get_file_reference()
- * @return string
- */
- public function get_link($reference) {
- $ref = unserialize($reference);
- if (!isset($ref->url)) {
- $this->dropbox->set_access_token($ref->access_key, $ref->access_secret);
- $ref->url = $this->dropbox->get_file_share_link($ref->path, self::GETFILE_TIMEOUT);
- }
- return $this->get_file_download_link($ref->url);
- }
- /**
- * Prepare file reference information
- *
- * @param string $source
- * @return string file referece
- */
- public function get_file_reference($source) {
- global $USER;
- $reference = new stdClass;
- $reference->path = $source;
- $reference->userid = $USER->id;
- $reference->username = fullname($USER);
- $reference->access_key = get_user_preferences($this->setting.'_access_key', '');
- $reference->access_secret = get_user_preferences($this->setting.'_access_secret', '');
- // by API we don't know if we need this reference to just download a file from dropbox
- // into moodle filepool or create a reference. Since we need to create a shared link
- // only in case of reference we analyze the script parameter
- $usefilereference = optional_param('usefilereference', false, PARAM_BOOL);
- if ($usefilereference) {
- $this->dropbox->set_access_token($reference->access_key, $reference->access_secret);
- $url = $this->dropbox->get_file_share_link($source, self::GETFILE_TIMEOUT);
- if ($url) {
- unset($reference->access_key);
- unset($reference->access_secret);
- $reference->url = $url;
- }
- }
- return serialize($reference);
- }
- public function sync_reference(stored_file $file) {
- if ($file->get_referencelastsync() + DAYSECS > time()) {
- // Synchronise not more often than once a day.
- return false;
- }
- $ref = unserialize($file->get_reference());
- if (!isset($ref->url)) {
- // this is an old-style reference in DB. We need to fix it
- $ref = unserialize($this->fix_old_style_reference($file->get_reference()));
- }
- if (!isset($ref->url)) {
- return false;
- }
- $c = new curl;
- $url = $this->get_file_download_link($ref->url);
- if (file_extension_in_typegroup($ref->path, 'web_image')) {
- $saveas = $this->prepare_file('');
- try {
- $result = $c->download_one($url, array(), array('filepath' => $saveas, 'timeout' => self::SYNCIMAGE_TIMEOUT, 'followlocation' => true));
- $info = $c->get_info();
- if ($result === true && isset($info['http_code']) && $info['http_code'] == 200) {
- $fs = get_file_storage();
- list($contenthash, $filesize, $newfile) = $fs->add_file_to_pool($saveas);
- $file->set_synchronized($contenthash, $filesize);
- return true;
- }
- } catch (Exception $e) {}
- }
- $c->get($url, null, array('timeout' => self::SYNCIMAGE_TIMEOUT, 'followlocation' => true, 'nobody' => true));
- $info = $c->get_info();
- if (isset($info['http_code']) && $info['http_code'] == 200 &&
- array_key_exists('download_content_length', $info) &&
- $info['download_content_length'] >= 0) {
- $filesize = (int)$info['download_content_length'];
- $file->set_synchronized(null, $filesize);
- return true;
- }
- $file->set_missingsource();
- return true;
- }
- /**
- * Cache file from external repository by reference
- *
- * Dropbox repository regularly caches all external files that are smaller than
- * {@link repository_dropbox::max_cache_bytes()}
- *
- * @param string $reference this reference is generated by
- * repository::get_file_reference()
- * @param stored_file $storedfile created file reference
- */
- public function cache_file_by_reference($reference, $storedfile) {
- try {
- $this->import_external_file_contents($storedfile, $this->max_cache_bytes());
- } catch (Exception $e) {}
- }
- /**
- * Return human readable reference information
- * {@link stored_file::get_reference()}
- *
- * @param string $reference
- * @param int $filestatus status of the file, 0 - ok, 666 - source missing
- * @return string
- */
- public function get_reference_details($reference, $filestatus = 0) {
- global $USER;
- $ref = unserialize($reference);
- $detailsprefix = $this->get_name();
- if (isset($ref->userid) && $ref->userid != $USER->id && isset($ref->username)) {
- $detailsprefix .= ' ('.$ref->username.')';
- }
- $details = $detailsprefix;
- if (isset($ref->path)) {
- $details .= ': '. $ref->path;
- }
- if (isset($ref->path) && !$filestatus) {
- // Indicate this is from dropbox with path
- return $details;
- } else {
- if (isset($ref->url)) {
- $details = $detailsprefix. ': '. $ref->url;
- }
- return get_string('lostsource', 'repository', $details);
- }
- }
- /**
- * Return the source information
- *
- * @param string $source
- * @return string
- */
- public function get_file_source_info($source) {
- global $USER;
- return 'Dropbox ('.fullname($USER).'): ' . $source;
- }
- /**
- * Returns the maximum size of the Dropbox files to cache in moodle
- *
- * Note that {@link repository_dropbox::sync_reference()} will try to cache images even
- * when they are bigger in order to generate thumbnails. However there is
- * a small timeout for downloading images for synchronisation and it will
- * probably fail if the image is too big.
- *
- * @return int
- */
- public function max_cache_bytes() {
- if ($this->cachelimit === null) {
- $this->cachelimit = (int)get_config('dropbox', 'dropbox_cachelimit');
- }
- return $this->cachelimit;
- }
- /**
- * Repository method to serve the referenced file
- *
- * This method is ivoked from {@link send_stored_file()}.
- * Dropbox repository first caches the file by reading it into temporary folder and then
- * serves from there.
- *
- * @param stored_file $storedfile the file that contains the reference
- * @param int $lifetime Number of seconds before the file should expire from caches (null means $CFG->filelifetime)
- * @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
- * @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
- * @param array $options additional options affecting the file serving
- */
- public function send_file($storedfile, $lifetime=null , $filter=0, $forcedownload=false, array $options = null) {
- $ref = unserialize($storedfile->get_reference());
- if ($storedfile->get_filesize() > $this->max_cache_bytes()) {
- header('Location: '.$this->get_file_download_link($ref->url));
- die;
- }
- try {
- $this->import_external_file_contents($storedfile, $this->max_cache_bytes());
- if (!is_array($options)) {
- $options = array();
- }
- $options['sendcachedexternalfile'] = true;
- send_stored_file($storedfile, $lifetime, $filter, $forcedownload, $options);
- } catch (moodle_exception $e) {
- // redirect to Dropbox, it will show the error.
- // We redirect to Dropbox shared link, not to download link here!
- header('Location: '.$ref->url);
- die;
- }
- }
- /**
- * Caches all references to Dropbox files in moodle filepool
- *
- * Invoked by {@link repository_dropbox_cron()}. Only files smaller than
- * {@link repository_dropbox::max_cache_bytes()} and only files which
- * synchronisation timeout have not expired are cached.
- */
- public function cron() {
- $fs = get_file_storage();
- $files = $fs->get_external_files($this->id);
- foreach ($files as $file) {
- try {
- // This call will cache all files that are smaller than max_cache_bytes()
- // and synchronise file size of all others
- $this->import_external_file_contents($file, $this->max_cache_bytes());
- } catch (moodle_exception $e) {}
- }
- }
- }
- /**
- * Dropbox plugin cron task
- */
- function repository_dropbox_cron() {
- $instances = repository::get_instances(array('type'=>'dropbox'));
- foreach ($instances as $instance) {
- $instance->cron();
- }
- }