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<?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://www.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;
// 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 = $result->contents;
foreach ($files as $file) {
if ($file->is_dir) {
$list['list'][] = array(
'title' => substr($file->path, strpos($file->path, $current_path)+strlen($current_path)),
'path' => file_correct_filepath($file->path),
'size' => $file->size,
'date' => $file->modified,
'thumbnail' => $OUTPUT->pix_url(file_folder_icon(90))->out(false),
'children' => array(),
);
} else {
$list['list'][] = array(
'title' => substr($file->path, strpos($file->path, $current_path)+strlen($current_path)),
'source' => $file->path,
'size' => $file->size,
'date' => $file->modified,
'thumbnail' => $OUTPUT->pix_url(file_extension_icon($file->path, 90))->out(false)
);
}
}
return $list;
}
/**
* Logout from dropbox
* @return array
*/
public function logout() {
set_user_preference($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'));
$mform->addElement('text', 'dropbox_secret', get_string('secret', 'repository_dropbox'), array('value'=>$secret,'size' => '40'));
$mform->addRule('dropbox_key', $strrequired, 'required', null, 'client');
$mform->addRule('dropbox_secret', $strrequired, 'required', null, 'client');
$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->addElement('static', 'dropbox_cachelimit_info', '', get_string('cachelimit_info', 'repository_dropbox'));
}
/**
* Validate Admin Settings Moodle form
*
* @param moodleform $mform Moodle form (passed by reference)
* @param array $data array of ("fieldname"=>value) of submitted data
* @param array $errors array of ("fieldname"=>errormessage) of errors
* @return array array of errors
*/
public static function type_form_validation($mform, $data, $errors) {
if (!empty($data['dropbox_cachelimit']) && (!is_number($data['dropbox_cachelimit']) ||
(int)$data['dropbox_cachelimit']<0)) {
$errors['dropbox_cachelimit'] = get_string('error_cachelimit', 'repository_dropbox');
}
return $errors;
}
/**
* 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);
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);
}
/**
* Returns information about file in this repository by reference
* {@link repository::get_file_reference()}
* {@link repository::get_file()}
*
* Returns null if file not found or is not readable
*
* @param stdClass $reference file reference db record
* @return null|stdClass that has 'filepath' property
*/
public function get_file_by_reference($reference) {
global $USER;
$ref = unserialize($reference->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($reference->reference));
}
if (!isset($ref->url)) {
return null;
}
$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) {
return (object)array('filepath' => $saveas);
}
} 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) &&
$info['download_content_length'] >= 0) {
return (object)array('filesize' => (int)$info['download_content_length']);
}
return null;
}
/**
* 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).'): ' . $source;
}
/**
* Returns the maximum size of the Dropbox files to cache in moodle
*
* Note that {@link repository_dropbox::get_file_by_reference()} called by
* {@link repository::sync_external_file()} will try to cache images even
* when they are bigger in order to generate thumbnails. However there is
* a small timeout for downloading images for synchronisation and it will
* probably fail if the image is too big.
*
* @return int
*/
public function max_cache_bytes() {
if ($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 (default 24 hours)
* @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=86400 , $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();
}
}
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