2 // This file is part of Moodle - http://moodle.org/
4 // Moodle is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // Moodle is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
18 * This plugin is used to access user's dropbox files
21 * @package repository_dropbox
22 * @copyright 2012 Marina Glancy
23 * @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
24 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
26 require_once($CFG->dirroot
. '/repository/lib.php');
29 * Repository to access Dropbox files
31 * @package repository_dropbox
32 * @copyright 2010 Dongsheng Cai
33 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
35 class repository_dropbox
extends repository
{
37 * @var dropbox The instance of dropbox client.
42 * @var int The maximum file size to cache in the moodle filepool.
44 public $cachelimit = null;
47 * Constructor of dropbox plugin.
51 public function __construct($repositoryid, $context = SYSCONTEXTID
, $options = []) {
52 $options['page'] = optional_param('p', 1, PARAM_INT
);
53 parent
::__construct($repositoryid, $context, $options);
55 $returnurl = new moodle_url('/repository/repository_callback.php', [
57 'repo_id' => $repositoryid,
58 'sesskey' => sesskey(),
61 // Create the dropbox API instance.
62 $key = get_config('dropbox', 'dropbox_key');
63 $secret = get_config('dropbox', 'dropbox_secret');
64 $this->dropbox
= new repository_dropbox\
dropbox(
72 * Repository method to serve the referenced file.
76 public function send_file($storedfile, $lifetime=null , $filter=0, $forcedownload=false, array $options = null) {
77 $reference = $this->unpack_reference($storedfile->get_reference());
79 $maxcachesize = $this->max_cache_bytes();
80 if (empty($maxcachesize)) {
81 // Always cache the file, regardless of size.
84 // Size available. Only cache if it is under maxcachesize.
85 $cachefile = $storedfile->get_filesize() < $maxcachesize;
89 \core\session\manager
::write_close();
90 header('Location: ' . $this->get_file_download_link($reference->url
));
95 $this->import_external_file_contents($storedfile, $this->max_cache_bytes());
96 if (!is_array($options)) {
99 $options['sendcachedexternalfile'] = true;
100 \core\session\manager
::write_close();
101 send_stored_file($storedfile, $lifetime, $filter, $forcedownload, $options);
102 } catch (moodle_exception
$e) {
103 // Redirect to Dropbox, it will show the error.
104 // Note: We redirect to Dropbox shared link, not to the download link here!
105 \core\session\manager
::write_close();
106 header('Location: ' . $reference->url
);
112 * Return human readable reference information.
113 * {@link stored_file::get_reference()}
117 public function get_reference_details($reference, $filestatus = 0) {
119 $ref = unserialize($reference);
120 $detailsprefix = $this->get_name();
121 if (isset($ref->userid
) && $ref->userid
!= $USER->id
&& isset($ref->username
)) {
122 $detailsprefix .= ' ('.$ref->username
.')';
124 $details = $detailsprefix;
125 if (isset($ref->path
)) {
126 $details .= ': '. $ref->path
;
128 if (isset($ref->path
) && !$filestatus) {
129 // Indicate this is from dropbox with path.
132 if (isset($ref->url
)) {
133 $details = $detailsprefix. ': '. $ref->url
;
135 return get_string('lostsource', 'repository', $details);
140 * Cache file from external repository by reference.
141 * {@link repository::get_file_reference()}
142 * {@link repository::get_file()}
143 * Invoked at MOODLE/repository/repository_ajax.php.
147 public function cache_file_by_reference($reference, $storedfile) {
149 $this->import_external_file_contents($storedfile, $this->max_cache_bytes());
150 } catch (Exception
$e) {
151 // Cache failure should not cause a fatal error. This is only a nice-to-have feature.
156 * Return the source information.
158 * The result of the function is stored in files.source field. It may be analysed
159 * when the source file is lost or repository may use it to display human-readable
160 * location of reference original.
162 * This method is called when file is picked for the first time only. When file
163 * (either copy or a reference) is already in moodle and it is being picked
164 * again to another file area (also as a copy or as a reference), the value of
165 * files.source is copied.
169 public function get_file_source_info($source) {
171 return 'Dropbox ('.fullname($USER).'): ' . $source;
175 * Prepare file reference information.
179 public function get_file_reference($source) {
181 $reference = new stdClass
;
182 $reference->userid
= $USER->id
;
183 $reference->username
= fullname($USER);
184 $reference->path
= $source;
186 // Determine whether we are downloading the file, or should use a file reference.
187 $usefilereference = optional_param('usefilereference', false, PARAM_BOOL
);
188 if ($usefilereference) {
189 if ($data = $this->dropbox
->get_file_share_info($source)) {
190 $reference = (object) array_merge((array) $data, (array) $reference);
194 return serialize($reference);
198 * Return file URL for external link.
202 public function get_link($reference) {
203 $unpacked = $this->unpack_reference($reference);
205 return $this->get_file_download_link($unpacked->url
);
209 * Downloads a file from external repository and saves it in temp dir.
213 public function get_file($reference, $saveas = '') {
214 $unpacked = $this->unpack_reference($reference);
216 // This is a shared link, and hopefully it is still active.
217 $downloadlink = $this->get_file_download_link($unpacked->url
);
219 $saveas = $this->prepare_file($saveas);
220 file_put_contents($saveas, fopen($downloadlink, 'r'));
222 return ['path' => $saveas];
226 * Dropbox plugin supports all kinds of files.
230 public function supported_filetypes() {
235 * User cannot use the external link to dropbox.
239 public function supported_returntypes() {
240 return FILE_INTERNAL | FILE_REFERENCE | FILE_EXTERNAL
;
248 public function get_listing($path = '', $page = '1') {
249 if (empty($path) ||
$path == '/') {
252 $path = file_correct_filepath($path);
257 'manage' => 'https://www.dropbox.com/home',
258 'logouturl' => 'https://www.dropbox.com/logout',
259 'message' => get_string('logoutdesc', 'repository_dropbox'),
261 'path' => $this->process_breadcrumbs($path),
264 // Note - we deliberately do not catch the coding exceptions here.
266 $result = $this->dropbox
->get_listing($path);
267 } catch (\repository_dropbox\authentication_exception
$e) {
268 // The token has expired.
269 return $this->print_login();
270 } catch (\repository_dropbox\dropbox_exception
$e) {
271 // There was some other form of non-coding failure.
272 // This could be a rate limit, or it could be a server-side error.
273 // Just return early instead.
277 if (!is_object($result) ||
empty($result)) {
281 if (empty($result->entries
) or !is_array($result->entries
)) {
285 $list['list'] = $this->process_entries($result->entries
);
290 * Get dropbox files in the specified path.
292 * @param string $query The search query
293 * @param int $page The page number
296 public function search($query, $page = 0) {
299 'manage' => 'https://www.dropbox.com/home',
300 'logouturl' => 'https://www.dropbox.com/logout',
301 'message' => get_string('logoutdesc', 'repository_dropbox'),
305 // Note - we deliberately do not catch the coding exceptions here.
307 $result = $this->dropbox
->search($query);
308 } catch (\repository_dropbox\authentication_exception
$e) {
309 // The token has expired.
310 return $this->print_login();
311 } catch (\repository_dropbox\dropbox_exception
$e) {
312 // There was some other form of non-coding failure.
313 // This could be a rate limit, or it could be a server-side error.
314 // Just return early instead.
318 if (!is_object($result) ||
empty($result)) {
322 if (empty($result->matches
) or !is_array($result->matches
)) {
326 $list['list'] = $this->process_entries($result->matches
);
331 * Displays a thumbnail for current user's dropbox file.
335 public function send_thumbnail($source) {
336 $content = $this->dropbox
->get_thumbnail($source);
338 // Set 30 days lifetime for the image.
339 // If the image is changed in dropbox it will have different revision number and URL will be different.
340 // It is completely safe to cache the thumbnail in the browser for a long time.
341 send_file($content, basename($source), 30 * DAYSECS
, 0, true);
345 * Fixes references in DB that contains user credentials.
347 * @param string $packed Content of DB field files_reference.reference
348 * @return string New serialized reference
350 protected function fix_old_style_reference($packed) {
351 $ref = unserialize($packed);
352 $ref = $this->dropbox
->get_file_share_info($ref->path
);
353 if (!$ref ||
empty($ref->url
)) {
354 // Some error occurred, do not fix reference for now.
358 $newreference = serialize($ref);
359 if ($newreference !== $packed) {
360 // We need to update references in the database.
363 'newreference' => $newreference,
364 'newhash' => sha1($newreference),
365 'reference' => $packed,
366 'hash' => sha1($packed),
367 'repoid' => $this->id
,
369 $refid = $DB->get_field_sql('SELECT id FROM {files_reference}
370 WHERE reference = :reference AND referencehash = :hash
371 AND repositoryid = :repoid', $params);
373 return $newreference;
376 $existingrefid = $DB->get_field_sql('SELECT id FROM {files_reference}
377 WHERE reference = :newreference AND referencehash = :newhash
378 AND repositoryid = :repoid', $params);
379 if ($existingrefid) {
380 // The same reference already exists, we unlink all files from it,
381 // link them to the current reference and remove the old one.
382 $DB->execute('UPDATE {files} SET referencefileid = :refid
383 WHERE referencefileid = :existingrefid',
384 array('refid' => $refid, 'existingrefid' => $existingrefid));
385 $DB->delete_records('files_reference', array('id' => $existingrefid));
388 // Update the reference.
389 $params['refid'] = $refid;
390 $DB->execute('UPDATE {files_reference}
391 SET reference = :newreference, referencehash = :newhash
392 WHERE id = :refid', $params);
394 return $newreference;
398 * Unpack the supplied serialized reference, fixing it if required.
400 * @param string $packed The packed reference
401 * @return object The unpacked reference
403 protected function unpack_reference($packed) {
404 $reference = unserialize($packed);
405 if (empty($reference->url
)) {
406 // The reference is missing some information. Attempt to update it.
407 return unserialize($this->fix_old_style_reference($packed));
414 * Converts a URL received from dropbox API function 'shares' into URL that
415 * can be used to download/access file directly
417 * @param string $sharedurl
420 protected function get_file_download_link($sharedurl) {
421 $url = new \
moodle_url($sharedurl);
422 $url->param('dl', 1);
424 return $url->out(false);
428 * Logout from dropbox.
432 public function logout() {
433 $this->dropbox
->logout();
435 return $this->print_login();
439 * Check if moodle has got access token and secret.
443 public function check_login() {
444 return $this->dropbox
->is_logged_in();
448 * Generate dropbox login url.
452 public function print_login() {
453 $url = $this->dropbox
->get_login_url();
454 if ($this->options
['ajax']) {
456 $btn = new \
stdClass();
457 $btn->type
= 'popup';
458 $btn->url
= $url->out(false);
459 $ret['login'] = array($btn);
462 echo html_writer
::link($url, get_string('login', 'repository'), array('target' => '_blank'));
467 * Request access token.
471 public function callback() {
472 $this->dropbox
->callback();
476 * Caches all references to Dropbox files in moodle filepool.
478 * Invoked by {@link repository_dropbox_cron()}. Only files smaller than
479 * {@link repository_dropbox::max_cache_bytes()} and only files which
480 * synchronisation timeout have not expired are cached.
484 public function cron() {
485 $fs = get_file_storage();
486 $files = $fs->get_external_files($this->id
);
487 $fetchedreferences = [];
488 foreach ($files as $file) {
489 if (isset($fetchedreferences[$file->get_referencefileid()])) {
493 // This call will cache all files that are smaller than max_cache_bytes()
494 // and synchronise file size of all others.
495 $this->import_external_file_contents($file, $this->max_cache_bytes());
496 $fetchedreferences[$file->get_referencefileid()] = true;
497 } catch (moodle_exception
$e) {
498 // If an exception is thrown, just continue. This is only a pre-fetch to help speed up general use.
504 * Add Plugin settings input to Moodle form.
508 public static function type_config_form($mform, $classname = 'repository') {
509 parent
::type_config_form($mform);
510 $key = get_config('dropbox', 'dropbox_key');
511 $secret = get_config('dropbox', 'dropbox_secret');
516 if (empty($secret)) {
520 $mform->addElement('text', 'dropbox_key', get_string('apikey', 'repository_dropbox'), array('value'=>$key,'size' => '40'));
521 $mform->setType('dropbox_key', PARAM_RAW_TRIMMED
);
522 $mform->addElement('text', 'dropbox_secret', get_string('secret', 'repository_dropbox'), array('value'=>$secret,'size' => '40'));
524 $mform->addRule('dropbox_key', get_string('required'), 'required', null, 'client');
525 $mform->addRule('dropbox_secret', get_string('required'), 'required', null, 'client');
526 $mform->setType('dropbox_secret', PARAM_RAW_TRIMMED
);
527 $mform->addElement('static', null, '', get_string('instruction', 'repository_dropbox'));
528 $mform->addElement('static', null,
529 get_string('oauth2redirecturi', 'repository_dropbox'),
530 self
::get_oauth2callbackurl()->out()
533 $mform->addElement('text', 'dropbox_cachelimit', get_string('cachelimit', 'repository_dropbox'), array('size' => '40'));
534 $mform->addRule('dropbox_cachelimit', null, 'numeric', null, 'client');
535 $mform->setType('dropbox_cachelimit', PARAM_INT
);
536 $mform->addElement('static', 'dropbox_cachelimit_info', '', get_string('cachelimit_info', 'repository_dropbox'));
543 * @param array $options
546 public function set_option($options = []) {
547 if (!empty($options['dropbox_key'])) {
548 set_config('dropbox_key', trim($options['dropbox_key']), 'dropbox');
549 unset($options['dropbox_key']);
551 if (!empty($options['dropbox_secret'])) {
552 set_config('dropbox_secret', trim($options['dropbox_secret']), 'dropbox');
553 unset($options['dropbox_secret']);
555 if (!empty($options['dropbox_cachelimit'])) {
556 $this->cachelimit
= (int) trim($options['dropbox_cachelimit']);
557 set_config('dropbox_cachelimit', $this->cachelimit
, 'dropbox');
558 unset($options['dropbox_cachelimit']);
561 return parent
::set_option($options);
565 * Get dropbox options
566 * @param string $config
569 public function get_option($config = '') {
570 if ($config === 'dropbox_key') {
571 return trim(get_config('dropbox', 'dropbox_key'));
572 } else if ($config === 'dropbox_secret') {
573 return trim(get_config('dropbox', 'dropbox_secret'));
574 } else if ($config === 'dropbox_cachelimit') {
575 return $this->max_cache_bytes();
577 $options = parent
::get_option();
578 $options['dropbox_key'] = trim(get_config('dropbox', 'dropbox_key'));
579 $options['dropbox_secret'] = trim(get_config('dropbox', 'dropbox_secret'));
580 $options['dropbox_cachelimit'] = $this->max_cache_bytes();
587 * Return the OAuth 2 Redirect URI.
591 public static function get_oauth2callbackurl() {
594 return new moodle_url('/admin/oauth2callback.php');
598 * Option names of dropbox plugin.
602 public static function get_type_option_names() {
607 'dropbox_cachelimit',
612 * Performs synchronisation of an external file if the previous one has expired.
614 * This function must be implemented for external repositories supporting
615 * FILE_REFERENCE, it is called for existing aliases when their filesize,
616 * contenthash or timemodified are requested. It is not called for internal
617 * repositories (see {@link repository::has_moodle_files()}), references to
618 * internal files are updated immediately when source is modified.
620 * Referenced files may optionally keep their content in Moodle filepool (for
621 * thumbnail generation or to be able to serve cached copy). In this
622 * case both contenthash and filesize need to be synchronized. Otherwise repositories
623 * should use contenthash of empty file and correct filesize in bytes.
625 * Note that this function may be run for EACH file that needs to be synchronised at the
626 * moment. If anything is being downloaded or requested from external sources there
627 * should be a small timeout. The synchronisation is performed to update the size of
628 * the file and/or to update image and re-generated image preview. There is nothing
629 * fatal if syncronisation fails but it is fatal if syncronisation takes too long
630 * and hangs the script generating a page.
632 * Note: If you wish to call $file->get_filesize(), $file->get_contenthash() or
633 * $file->get_timemodified() make sure that recursion does not happen.
635 * Called from {@link stored_file::sync_external_file()}
639 public function sync_reference(stored_file
$file) {
642 if ($file->get_referencelastsync() + DAYSECS
> time()) {
643 // Only synchronise once per day.
647 $reference = $this->unpack_reference($file->get_reference());
648 if (!isset($reference->url
)) {
649 // The URL to sync with is missing.
654 $url = $this->get_file_download_link($reference->url
);
655 if (file_extension_in_typegroup($reference->path
, 'web_image')) {
656 $saveas = $this->prepare_file('');
658 $result = $c->download_one($url, [], [
659 'filepath' => $saveas,
660 'timeout' => $CFG->repositorysyncimagetimeout
,
661 'followlocation' => true,
663 $info = $c->get_info();
664 if ($result === true && isset($info['http_code']) && $info['http_code'] == 200) {
665 $file->set_synchronised_content_from_file($saveas);
668 } catch (Exception
$e) {
669 // IF the download_one fails, we will attempt to download
670 // again with get() anyway.
674 $c->get($url, null, array('timeout' => $CFG->repositorysyncimagetimeout
, 'followlocation' => true, 'nobody' => true));
675 $info = $c->get_info();
676 if (isset($info['http_code']) && $info['http_code'] == 200 &&
677 array_key_exists('download_content_length', $info) &&
678 $info['download_content_length'] >= 0) {
679 $filesize = (int)$info['download_content_length'];
680 $file->set_synchronized(null, $filesize);
683 $file->set_missingsource();
688 * Process a standard entries list.
690 * @param array $entries The list of entries returned from the API
691 * @return array The manipulated entries for display in the file picker
693 protected function process_entries(array $entries) {
698 foreach ($entries as $entry) {
700 if (isset($entrydata->metadata
)) {
701 // If this is metadata, fetch the metadata content.
702 // We only use the consistent parts of the file, folder, and metadata.
703 $entrydata = $entrydata->metadata
;
705 if ($entrydata->{".tag"} === "folder") {
707 'title' => $entrydata->name
,
708 // Use the display path here rather than lower.
709 // Dropbox is case insensitive but this leads to more accurate breadcrumbs.
710 'path' => file_correct_filepath($entrydata->path_display
),
711 'thumbnail' => $OUTPUT->image_url(file_folder_icon(64))->out(false),
712 'thumbnail_height' => 64,
713 'thumbnail_width' => 64,
714 'children' => array(),
716 } else if ($entrydata->{".tag"} === "file") {
718 'title' => $entrydata->name
,
719 // Use the path_lower here to make life easier elsewhere.
720 'source' => $entrydata->path_lower
,
721 'size' => $entrydata->size
,
722 'date' => strtotime($entrydata->client_modified
),
723 'thumbnail' => $OUTPUT->image_url(file_extension_icon($entrydata->path_lower
, 64))->out(false),
724 'realthumbnail' => $this->get_thumbnail_url($entrydata),
725 'thumbnail_height' => 64,
726 'thumbnail_width' => 64,
731 $fileslist = array_filter($fileslist, array($this, 'filter'));
733 return array_merge($dirslist, array_values($fileslist));
737 * Process the breadcrumbs for a listing.
739 * @param string $path The path to create breadcrumbs for
742 protected function process_breadcrumbs($path) {
743 // Process breadcrumb trail.
744 // Note: Dropbox is case insensitive.
745 // Without performing an additional API call, it isn't possible to get the path_display.
746 // As a result, the path here is the path_lower.
750 'name' => get_string('dropbox', 'repository_dropbox'),
754 $path = rtrim($path, '/');
755 $directories = explode('/', $path);
757 foreach ($directories as $directory) {
758 if ($directory === '') {
761 $pathtodate .= '/' . $directory;
763 'path' => $pathtodate,
764 'name' => $directory,
772 * Grab the thumbnail URL for the specified entry.
774 * @param object $entry The file entry as retrieved from the API
777 protected function get_thumbnail_url($entry) {
778 if ($this->dropbox
->supports_thumbnail($entry)) {
779 $thumburl = new moodle_url('/repository/dropbox/thumbnail.php', [
780 // The id field in dropbox is unique - no need to specify a revision.
781 'source' => $entry->id
,
782 'path' => $entry->path_lower
,
784 'repo_id' => $this->id
,
785 'ctx_id' => $this->context
->id
,
787 return $thumburl->out(false);
794 * Returns the maximum size of the Dropbox files to cache in moodle.
796 * Note that {@link repository_dropbox::sync_reference()} will try to cache images even
797 * when they are bigger in order to generate thumbnails. However there is
798 * a small timeout for downloading images for synchronisation and it will
799 * probably fail if the image is too big.
803 public function max_cache_bytes() {
804 if ($this->cachelimit
=== null) {
805 $this->cachelimit
= (int) get_config('dropbox', 'dropbox_cachelimit');
807 return $this->cachelimit
;
812 * Dropbox plugin cron task.
814 function repository_dropbox_cron() {
815 $instances = repository
::get_instances(array('type'=>'dropbox'));
816 foreach ($instances as $instance) {