repository/repository_ajax.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   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.
   8 //
   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.
  13 //
  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/>.
  16
  17
  18 /**
  19  * The Web service script that is called from the filepicker front end
  20  *
  21  * @since 2.0
  22  * @package    repository
  23  * @copyright  2009 Dongsheng Cai {@link http://dongsheng.org}
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 define('AJAX_SCRIPT', true);
  28
  29 require_once(dirname(dirname(__FILE__)).'/config.php');
  30 require_once(dirname(dirname(__FILE__)).'/lib/filelib.php');
  31 require_once(dirname(__FILE__).'/lib.php');
  32
  33 $err = new stdClass();
  34
  35 // Parameters
  36 $action    = optional_param('action', '', PARAM_ALPHA);
  37 $repo_id   = optional_param('repo_id', 0, PARAM_INT);           // Repository ID
  38 $contextid = optional_param('ctx_id', SYSCONTEXTID, PARAM_INT); // Context ID
  39 $env       = optional_param('env', 'filepicker', PARAM_ALPHA);  // Opened in editor or moodleform
  40 $license   = optional_param('license', $CFG->sitedefaultlicense, PARAM_TEXT);
  41 $author    = optional_param('author', '', PARAM_TEXT);          // File author
  42 $source    = optional_param('source', '', PARAM_RAW);           // File to download
  43 $itemid    = optional_param('itemid', 0, PARAM_INT);            // Itemid
  44 $page      = optional_param('page', '', PARAM_RAW);             // Page
  45 $maxbytes  = optional_param('maxbytes', 0, PARAM_INT);          // Maxbytes
  46 $req_path  = optional_param('p', '', PARAM_RAW);                // Path
  47 $accepted_types  = optional_param_array('accepted_types', '*', PARAM_RAW);
  48 $saveas_filename = optional_param('title', '', PARAM_FILE);     // save as file name
  49 $areamaxbytes  = optional_param('areamaxbytes', FILE_AREA_MAX_BYTES_UNLIMITED, PARAM_INT); // Area max bytes.
  50 $saveas_path   = optional_param('savepath', '/', PARAM_PATH);   // save as file path
  51 $search_text   = optional_param('s', '', PARAM_CLEANHTML);
  52 $linkexternal  = optional_param('linkexternal', '', PARAM_ALPHA);
  53 $usefilereference  = optional_param('usefilereference', false, PARAM_BOOL);
  54
  55 list($context, $course, $cm) = get_context_info_array($contextid);
  56 require_login($course, false, $cm, false, true);
  57 $PAGE->set_context($context);
  58
  59 echo $OUTPUT->header(); // send headers
  60
  61 // If uploaded file is larger than post_max_size (php.ini) setting, $_POST content will be empty.
  62 if (empty($_POST) && !empty($action)) {
  63     $err->error = get_string('errorpostmaxsize', 'repository');
  64     die(json_encode($err));
  65 }
  66
  67 if (!confirm_sesskey()) {
  68     $err->error = get_string('invalidsesskey', 'error');
  69     die(json_encode($err));
  70 }
  71
  72 // Get repository instance information
  73 $repooptions = array(
  74     'ajax' => true,
  75     'mimetypes' => $accepted_types
  76 );
  77 $repo = repository::get_repository_by_id($repo_id, $contextid, $repooptions);
  78
  79 // Check permissions
  80 $repo->check_capability();
  81
  82 $coursemaxbytes = 0;
  83 if (!empty($course)) {
  84     $coursemaxbytes = $course->maxbytes;
  85 }
  86 // Make sure maxbytes passed is within site filesize limits.
  87 $maxbytes = get_user_max_upload_file_size($context, $CFG->maxbytes, $coursemaxbytes, $maxbytes);
  88
  89 // Wait as long as it takes for this script to finish
  90 set_time_limit(0);
  91
  92 // These actions all occur on the currently active repository instance
  93 switch ($action) {
  94     case 'sign':
  95     case 'signin':
  96     case 'list':
  97         if ($repo->check_login()) {
  98             $listing = repository::prepare_listing($repo->get_listing($req_path, $page));
  99             $listing['repo_id'] = $repo_id;
 100             echo json_encode($listing);
 101             break;
 102         } else {
 103             $action = 'login';
 104         }
 105     case 'login':
 106         $listing = $repo->print_login();
 107         $listing['repo_id'] = $repo_id;
 108         echo json_encode($listing);
 109         break;
 110     case 'logout':
 111         $logout = $repo->logout();
 112         $logout['repo_id'] = $repo_id;
 113         echo json_encode($logout);
 114         break;
 115     case 'searchform':
 116         $search_form['repo_id'] = $repo_id;
 117         $search_form['form'] = $repo->print_search();
 118         $search_form['allowcaching'] = true;
 119         echo json_encode($search_form);
 120         break;
 121     case 'search':
 122         $search_result = repository::prepare_listing($repo->search($search_text, (int)$page));
 123         $search_result['repo_id'] = $repo_id;
 124         $search_result['issearchresult'] = true;
 125         echo json_encode($search_result);
 126         break;
 127     case 'download':
 128         // validate mimetype
 129         $mimetypes = array();
 130         if ((is_array($accepted_types) and in_array('*', $accepted_types)) or $accepted_types == '*') {
 131             $mimetypes = '*';
 132         } else {
 133             foreach ($accepted_types as $type) {
 134                 $mimetypes[] = mimeinfo('type', $type);
 135             }
 136             if (!in_array(mimeinfo('type', $saveas_filename), $mimetypes)) {
 137                 throw new moodle_exception('invalidfiletype', 'repository', '', get_mimetype_description(array('filename' => $saveas_filename)));
 138             }
 139         }
 140
 141         // We have two special repository type need to deal with
 142         // local and recent plugins don't added new files to moodle, just add new records to database
 143         // so we don't check user quota and maxbytes here
 144         $allowexternallink = (int)get_config(null, 'repositoryallowexternallinks');
 145         if (!empty($allowexternallink)) {
 146             $allowexternallink = true;
 147         } else {
 148             $allowexternallink = false;
 149         }
 150         // allow external links in url element all the time
 151         $allowexternallink = ($allowexternallink || ($env == 'url'));
 152
 153         $reference = $repo->get_file_reference($source);
 154
 155         // Use link of the files
 156         if ($allowexternallink and $linkexternal === 'yes' and ($repo->supported_returntypes() & FILE_EXTERNAL)) {
 157             // use external link
 158             $link = $repo->get_link($reference);
 159             $info = array();
 160             $info['file'] = $saveas_filename;
 161             $info['type'] = 'link';
 162             $info['url'] = $link;
 163             echo json_encode($info);
 164             die;
 165         } else {
 166             $fs = get_file_storage();
 167
 168             // Prepare file record.
 169             $record = new stdClass();
 170             $record->filepath = $saveas_path;
 171             $record->filename = $saveas_filename;
 172             $record->component = 'user';
 173             $record->filearea = 'draft';
 174             $record->itemid = $itemid;
 175             $record->license = $license;
 176             $record->author = $author;
 177
 178             if ($record->filepath !== '/') {
 179                 $record->filepath = trim($record->filepath, '/');
 180                 $record->filepath = '/'.$record->filepath.'/';
 181             }
 182             $usercontext = context_user::instance($USER->id);
 183             $now = time();
 184             $record->contextid = $usercontext->id;
 185             $record->timecreated = $now;
 186             $record->timemodified = $now;
 187             $record->userid = $USER->id;
 188             $record->sortorder = 0;
 189
 190             // Check that user has permission to access this file
 191             if (!$repo->file_is_accessible($source)) {
 192                 throw new file_exception('storedfilecannotread');
 193             }
 194
 195             // {@link repository::build_source_field()}
 196             $sourcefield = $repo->get_file_source_info($source);
 197             $record->source = $repo::build_source_field($sourcefield);
 198
 199             // If file is already a reference, set $source = file source, $repo = file repository
 200             // note that in this case user may not have permission to access the source file directly
 201             // so no file_browser/file_info can be used below
 202             if ($repo->has_moodle_files()) {
 203                 $file = repository::get_moodle_file($source);
 204                 if ($file && $file->is_external_file()) {
 205                     $sourcefield = $file->get_source(); // remember the original source
 206                     $record->source = $repo::build_source_field($sourcefield);
 207                     $record->contenthash = $file->get_contenthash();
 208                     $record->filesize = $file->get_filesize();
 209                     $reference = $file->get_reference();
 210                     $repo_id = $file->get_repository_id();
 211                     $repo = repository::get_repository_by_id($repo_id, $contextid, $repooptions);
 212                 }
 213             }
 214
 215             if ($usefilereference) {
 216                 if ($repo->has_moodle_files()) {
 217                     $sourcefile = repository::get_moodle_file($reference);
 218                     $record->contenthash = $sourcefile->get_contenthash();
 219                     $record->filesize = $sourcefile->get_filesize();
 220                 }
 221                 // Check if file exists.
 222                 if (repository::draftfile_exists($itemid, $saveas_path, $saveas_filename)) {
 223                     // File name being used, rename it.
 224                     $unused_filename = repository::get_unused_filename($itemid, $saveas_path, $saveas_filename);
 225                     $record->filename = $unused_filename;
 226                     // Create a file copy using unused filename.
 227                     $storedfile = $fs->create_file_from_reference($record, $repo_id, $reference);
 228
 229                     $event = array();
 230                     $event['event'] = 'fileexists';
 231                     $event['newfile'] = new stdClass;
 232                     $event['newfile']->filepath = $saveas_path;
 233                     $event['newfile']->filename = $unused_filename;
 234                     $event['newfile']->url = moodle_url::make_draftfile_url($itemid, $saveas_path, $unused_filename)->out();
 235
 236                     $event['existingfile'] = new stdClass;
 237                     $event['existingfile']->filepath = $saveas_path;
 238                     $event['existingfile']->filename = $saveas_filename;
 239                     $event['existingfile']->url      = moodle_url::make_draftfile_url($itemid, $saveas_path, $saveas_filename)->out();
 240                 } else {
 241
 242                     $storedfile = $fs->create_file_from_reference($record, $repo_id, $reference);
 243                     $event = array(
 244                         'url'=>moodle_url::make_draftfile_url($storedfile->get_itemid(), $storedfile->get_filepath(), $storedfile->get_filename())->out(),
 245                         'id'=>$storedfile->get_itemid(),
 246                         'file'=>$storedfile->get_filename(),
 247                         'icon' => $OUTPUT->pix_url(file_file_icon($storedfile, 32))->out(),
 248                     );
 249                 }
 250                 // Repository plugin callback
 251                 // You can cache reository file in this callback
 252                 // or complete other tasks.
 253                 $repo->cache_file_by_reference($reference, $storedfile);
 254                 echo json_encode($event);
 255                 die;
 256             } else if ($repo->has_moodle_files()) {
 257                 // Some repository plugins (local, user, coursefiles, recent) are hosting moodle
 258                 // internal files, we cannot use get_file method, so we use copy_to_area method
 259
 260                 // If the moodle file is an alias we copy this alias, otherwise we copy the file
 261                 // {@link repository::copy_to_area()}.
 262                 $fileinfo = $repo->copy_to_area($reference, $record, $maxbytes, $areamaxbytes);
 263
 264                 echo json_encode($fileinfo);
 265                 die;
 266             } else {
 267                 // Download file to moodle.
 268                 $downloadedfile = $repo->get_file($reference, $saveas_filename);
 269                 if (empty($downloadedfile['path'])) {
 270                     $err->error = get_string('cannotdownload', 'repository');
 271                     die(json_encode($err));
 272                 }
 273
 274                 // Check if exceed maxbytes.
 275                 if ($maxbytes != -1 && filesize($downloadedfile['path']) > $maxbytes) {
 276                     throw new file_exception('maxbytes');
 277                 }
 278
 279                 // Check if we exceed the max bytes of the area.
 280                 if (file_is_draft_area_limit_reached($itemid, $areamaxbytes, filesize($downloadedfile['path']))) {
 281                     throw new file_exception('maxareabytes');
 282                 }
 283
 284                 $info = repository::move_to_filepool($downloadedfile['path'], $record);
 285                 if (empty($info)) {
 286                     $info['e'] = get_string('error', 'moodle');
 287                 }
 288             }
 289             echo json_encode($info);
 290             die;
 291         }
 292         break;
 293     case 'upload':
 294         $result = $repo->upload($saveas_filename, $maxbytes);
 295         echo json_encode($result);
 296         break;
 297
 298     case 'overwrite':
 299         // existing file
 300         $filepath    = required_param('existingfilepath', PARAM_PATH);
 301         $filename    = required_param('existingfilename', PARAM_FILE);
 302         // user added file which needs to replace the existing file
 303         $newfilepath = required_param('newfilepath', PARAM_PATH);
 304         $newfilename = required_param('newfilename', PARAM_FILE);
 305
 306         $info = repository::overwrite_existing_draftfile($itemid, $filepath, $filename, $newfilepath, $newfilename);
 307         echo json_encode($info);
 308         break;
 309
 310     case 'deletetmpfile':
 311         // delete tmp file
 312         $newfilepath = required_param('newfilepath', PARAM_PATH);
 313         $newfilename = required_param('newfilename', PARAM_FILE);
 314         echo json_encode(repository::delete_tempfile_from_draft($itemid, $newfilepath, $newfilename));
 315
 316         break;
 317 }