files/externallib.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  * External files API
  20  *
  21  * @package    core_files
  22  * @category   external
  23  * @copyright  2010 Dongsheng Cai
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 require_once("$CFG->libdir/externallib.php");
  28 require_once("$CFG->libdir/filelib.php");
  29
  30 /**
  31  * Files external functions
  32  *
  33  * @package    core_files
  34  * @category   external
  35  * @copyright  2011 Jerome Mouneyrac
  36  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37  * @since Moodle 2.2
  38  */
  39 class core_files_external extends external_api {
  40
  41     /**
  42      * Returns description of get_files parameters
  43      *
  44      * @return external_function_parameters
  45      * @since Moodle 2.2
  46      */
  47     public static function get_files_parameters() {
  48         return new external_function_parameters(
  49             array(
  50                 'contextid'    => new external_value(PARAM_INT, 'context id Set to -1 to use contextlevel and instanceid.'),
  51                 'component'    => new external_value(PARAM_TEXT, 'component'),
  52                 'filearea'     => new external_value(PARAM_TEXT, 'file area'),
  53                 'itemid'       => new external_value(PARAM_INT, 'associated id'),
  54                 'filepath'     => new external_value(PARAM_PATH, 'file path'),
  55                 'filename'     => new external_value(PARAM_TEXT, 'file name'),
  56                 'modified'     => new external_value(PARAM_INT, 'timestamp to return files changed after this time.', VALUE_DEFAULT, null),
  57                 'contextlevel' => new external_value(PARAM_ALPHA, 'The context level for the file location.', VALUE_DEFAULT, null),
  58                 'instanceid'   => new external_value(PARAM_INT, 'The instance id for where the file is located.', VALUE_DEFAULT, null)
  59
  60             )
  61         );
  62     }
  63
  64     /**
  65      * Return moodle files listing
  66      *
  67      * @param int $contextid context id
  68      * @param int $component component
  69      * @param int $filearea file area
  70      * @param int $itemid item id
  71      * @param string $filepath file path
  72      * @param string $filename file name
  73      * @param int $modified timestamp to return files changed after this time.
  74      * @param string $contextlevel The context level for the file location.
  75      * @param int $instanceid The instance id for where the file is located.
  76      * @return array
  77      * @since Moodle 2.2
  78      */
  79     public static function get_files($contextid, $component, $filearea, $itemid, $filepath, $filename, $modified = null,
  80                                      $contextlevel = null, $instanceid = null) {
  81
  82         $parameters = array(
  83             'contextid'    => $contextid,
  84             'component'    => $component,
  85             'filearea'     => $filearea,
  86             'itemid'       => $itemid,
  87             'filepath'     => $filepath,
  88             'filename'     => $filename,
  89             'modified'     => $modified,
  90             'contextlevel' => $contextlevel,
  91             'instanceid'   => $instanceid);
  92         $fileinfo = self::validate_parameters(self::get_files_parameters(), $parameters);
  93
  94         $browser = get_file_browser();
  95
  96         // We need to preserve backwards compatibility. Zero will use the system context and minus one will
  97         // use the addtional parameters to determine the context.
  98         // TODO MDL-40489 get_context_from_params should handle this logic.
  99         if ($fileinfo['contextid'] == 0) {
 100             $context = context_system::instance();
 101         } else {
 102             if ($fileinfo['contextid'] == -1) {
 103                 $fileinfo['contextid'] = null;
 104             }
 105             $context = self::get_context_from_params($fileinfo);
 106         }
 107         self::validate_context($context);
 108
 109         if (empty($fileinfo['component'])) {
 110             $fileinfo['component'] = null;
 111         }
 112         if (empty($fileinfo['filearea'])) {
 113             $fileinfo['filearea'] = null;
 114         }
 115         if (empty($fileinfo['filename'])) {
 116             $fileinfo['filename'] = null;
 117         }
 118         if (empty($fileinfo['filepath'])) {
 119             $fileinfo['filepath'] = null;
 120         }
 121
 122         $return = array();
 123         $return['parents'] = array();
 124         $return['files'] = array();
 125         $list = array();
 126
 127         if ($file = $browser->get_file_info(
 128             $context, $fileinfo['component'], $fileinfo['filearea'], $fileinfo['itemid'],
 129                 $fileinfo['filepath'], $fileinfo['filename'])) {
 130             $level = $file->get_parent();
 131             while ($level) {
 132                 $params = $level->get_params();
 133                 $params['filename'] = $level->get_visible_name();
 134                 array_unshift($return['parents'], $params);
 135                 $level = $level->get_parent();
 136             }
 137             $children = $file->get_children();
 138             foreach ($children as $child) {
 139
 140                 $params = $child->get_params();
 141                 $timemodified = $child->get_timemodified();
 142
 143                 if ($child->is_directory()) {
 144                     if ((is_null($modified)) or ($modified < $timemodified)) {
 145                         $node = array(
 146                             'contextid' => $params['contextid'],
 147                             'component' => $params['component'],
 148                             'filearea'  => $params['filearea'],
 149                             'itemid'    => $params['itemid'],
 150                             'filepath'  => $params['filepath'],
 151                             'filename'  => $child->get_visible_name(),
 152                             'url'       => null,
 153                             'isdir'     => true,
 154                             'timemodified' => $timemodified
 155                            );
 156                            $list[] = $node;
 157                     }
 158                 } else {
 159                     if ((is_null($modified)) or ($modified < $timemodified)) {
 160                         $node = array(
 161                             'contextid' => $params['contextid'],
 162                             'component' => $params['component'],
 163                             'filearea'  => $params['filearea'],
 164                             'itemid'    => $params['itemid'],
 165                             'filepath'  => $params['filepath'],
 166                             'filename'  => $child->get_visible_name(),
 167                             'url'       => $child->get_url(),
 168                             'isdir'     => false,
 169                             'timemodified' => $timemodified
 170                         );
 171                            $list[] = $node;
 172                     }
 173                 }
 174             }
 175         }
 176         $return['files'] = $list;
 177         return $return;
 178     }
 179
 180     /**
 181      * Returns description of get_files returns
 182      *
 183      * @return external_single_structure
 184      * @since Moodle 2.2
 185      */
 186     public static function get_files_returns() {
 187         return new external_single_structure(
 188             array(
 189                 'parents' => new external_multiple_structure(
 190                     new external_single_structure(
 191                         array(
 192                             'contextid' => new external_value(PARAM_INT, ''),
 193                             'component' => new external_value(PARAM_COMPONENT, ''),
 194                             'filearea'  => new external_value(PARAM_AREA, ''),
 195                             'itemid'    => new external_value(PARAM_INT, ''),
 196                             'filepath'  => new external_value(PARAM_TEXT, ''),
 197                             'filename'  => new external_value(PARAM_TEXT, ''),
 198                         )
 199                     )
 200                 ),
 201                 'files' => new external_multiple_structure(
 202                     new external_single_structure(
 203                         array(
 204                             'contextid' => new external_value(PARAM_INT, ''),
 205                             'component' => new external_value(PARAM_COMPONENT, ''),
 206                             'filearea'  => new external_value(PARAM_AREA, ''),
 207                             'itemid'   => new external_value(PARAM_INT, ''),
 208                             'filepath' => new external_value(PARAM_TEXT, ''),
 209                             'filename' => new external_value(PARAM_TEXT, ''),
 210                             'isdir'    => new external_value(PARAM_BOOL, ''),
 211                             'url'      => new external_value(PARAM_TEXT, ''),
 212                             'timemodified' => new external_value(PARAM_INT, ''),
 213                         )
 214                     )
 215                 )
 216             )
 217         );
 218     }
 219
 220     /**
 221      * Returns description of upload parameters
 222      *
 223      * @return external_function_parameters
 224      * @since Moodle 2.2
 225      */
 226     public static function upload_parameters() {
 227         return new external_function_parameters(
 228             array(
 229                 'contextid' => new external_value(PARAM_INT, 'context id', VALUE_DEFAULT, null),
 230                 'component' => new external_value(PARAM_COMPONENT, 'component'),
 231                 'filearea'  => new external_value(PARAM_AREA, 'file area'),
 232                 'itemid'    => new external_value(PARAM_INT, 'associated id'),
 233                 'filepath'  => new external_value(PARAM_PATH, 'file path'),
 234                 'filename'  => new external_value(PARAM_FILE, 'file name'),
 235                 'filecontent' => new external_value(PARAM_TEXT, 'file content'),
 236                 'contextlevel' => new external_value(PARAM_ALPHA, 'The context level to put the file in,
 237                         (block, course, coursecat, system, user, module)', VALUE_DEFAULT, null),
 238                 'instanceid' => new external_value(PARAM_INT, 'The Instance id of item associated
 239                          with the context level', VALUE_DEFAULT, null)
 240             )
 241         );
 242     }
 243
 244     /**
 245      * Uploading a file to moodle
 246      *
 247      * @param int    $contextid    context id
 248      * @param string $component    component
 249      * @param string $filearea     file area
 250      * @param int    $itemid       item id
 251      * @param string $filepath     file path
 252      * @param string $filename     file name
 253      * @param string $filecontent  file content
 254      * @param string $contextlevel Context level (block, course, coursecat, system, user or module)
 255      * @param int    $instanceid   Instance id of the item associated with the context level
 256      * @return array
 257      * @since Moodle 2.2
 258      */
 259     public static function upload($contextid, $component, $filearea, $itemid, $filepath, $filename, $filecontent, $contextlevel, $instanceid) {
 260         global $USER, $CFG;
 261
 262         $fileinfo = self::validate_parameters(self::upload_parameters(), array(
 263                 'contextid' => $contextid, 'component' => $component, 'filearea' => $filearea, 'itemid' => $itemid,
 264                 'filepath' => $filepath, 'filename' => $filename, 'filecontent' => $filecontent, 'contextlevel' => $contextlevel,
 265                 'instanceid' => $instanceid));
 266
 267         if (!isset($fileinfo['filecontent'])) {
 268             throw new moodle_exception('nofile');
 269         }
 270         // Saving file.
 271         $dir = make_temp_directory('wsupload');
 272
 273         if (empty($fileinfo['filename'])) {
 274             $filename = uniqid('wsupload', true).'_'.time().'.tmp';
 275         } else {
 276             $filename = $fileinfo['filename'];
 277         }
 278
 279         if (file_exists($dir.$filename)) {
 280             $savedfilepath = $dir.uniqid('m').$filename;
 281         } else {
 282             $savedfilepath = $dir.$filename;
 283         }
 284
 285         file_put_contents($savedfilepath, base64_decode($fileinfo['filecontent']));
 286         @chmod($savedfilepath, $CFG->filepermissions);
 287         unset($fileinfo['filecontent']);
 288
 289         if (!empty($fileinfo['filepath'])) {
 290             $filepath = $fileinfo['filepath'];
 291         } else {
 292             $filepath = '/';
 293         }
 294
 295         // Only allow uploads to draft or private areas (private is deprecated but still supported)
 296         if (!($fileinfo['component'] == 'user' and in_array($fileinfo['filearea'], array('private', 'draft')))) {
 297             throw new coding_exception('File can be uploaded to user private or draft areas only');
 298         } else {
 299             $component = 'user';
 300             $filearea = $fileinfo['filearea'];
 301         }
 302
 303         $itemid = 0;
 304         if (isset($fileinfo['itemid'])) {
 305             $itemid = $fileinfo['itemid'];
 306         }
 307         if ($filearea == 'draft' && $itemid <= 0) {
 308             // Generate a draft area for the files.
 309             $itemid = file_get_unused_draft_itemid();
 310         } else if ($filearea == 'private') {
 311             // TODO MDL-31116 in user private area, itemid is always 0.
 312             $itemid = 0;
 313         }
 314
 315         // We need to preserve backword compatibility. Context id is no more a required.
 316         if (empty($fileinfo['contextid'])) {
 317             unset($fileinfo['contextid']);
 318         }
 319
 320         // Get and validate context.
 321         $context = self::get_context_from_params($fileinfo);
 322         self::validate_context($context);
 323         if (($fileinfo['component'] == 'user' and $fileinfo['filearea'] == 'private')) {
 324             require_capability('moodle/user:manageownfiles', $context);
 325             debugging('Uploading directly to user private files area is deprecated. Upload to a draft area and then move the files with core_user::add_user_private_files');
 326         }
 327
 328         $browser = get_file_browser();
 329
 330         // Check existing file.
 331         if ($file = $browser->get_file_info($context, $component, $filearea, $itemid, $filepath, $filename)) {
 332             throw new moodle_exception('fileexist');
 333         }
 334
 335         // Move file to filepool.
 336         if ($dir = $browser->get_file_info($context, $component, $filearea, $itemid, $filepath, '.')) {
 337             $info = $dir->create_file_from_pathname($filename, $savedfilepath);
 338             $params = $info->get_params();
 339             unlink($savedfilepath);
 340             return array(
 341                 'contextid'=>$params['contextid'],
 342                 'component'=>$params['component'],
 343                 'filearea'=>$params['filearea'],
 344                 'itemid'=>$params['itemid'],
 345                 'filepath'=>$params['filepath'],
 346                 'filename'=>$params['filename'],
 347                 'url'=>$info->get_url()
 348                 );
 349         } else {
 350             throw new moodle_exception('nofile');
 351         }
 352     }
 353
 354     /**
 355      * Returns description of upload returns
 356      *
 357      * @return external_single_structure
 358      * @since Moodle 2.2
 359      */
 360     public static function upload_returns() {
 361         return new external_single_structure(
 362              array(
 363                  'contextid' => new external_value(PARAM_INT, ''),
 364                  'component' => new external_value(PARAM_COMPONENT, ''),
 365                  'filearea'  => new external_value(PARAM_AREA, ''),
 366                  'itemid'   => new external_value(PARAM_INT, ''),
 367                  'filepath' => new external_value(PARAM_TEXT, ''),
 368                  'filename' => new external_value(PARAM_FILE, ''),
 369                  'url'      => new external_value(PARAM_TEXT, ''),
 370              )
 371         );
 372     }
 373 }
 374
 375 /**
 376  * Deprecated files external functions
 377  *
 378  * @package    core_files
 379  * @copyright  2010 Dongsheng Cai
 380  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 381  * @since Moodle 2.0
 382  * @deprecated Moodle 2.2 MDL-29106 - Please do not use this class any more.
 383  * @see core_files_external
 384  */
 385 class moodle_file_external extends external_api {
 386
 387     /**
 388      * Returns description of get_files parameters
 389      *
 390      * @return external_function_parameters
 391      * @since Moodle 2.0
 392      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 393      * @see core_files_external::get_files_parameters()
 394      */
 395     public static function get_files_parameters() {
 396         return core_files_external::get_files_parameters();
 397     }
 398
 399     /**
 400      * Return moodle files listing
 401      *
 402      * @param int $contextid
 403      * @param int $component
 404      * @param int $filearea
 405      * @param int $itemid
 406      * @param string $filepath
 407      * @param string $filename
 408      * @return array
 409      * @since Moodle 2.0
 410      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 411      * @see core_files_external::get_files()
 412      */
 413     public static function get_files($contextid, $component, $filearea, $itemid, $filepath, $filename) {
 414         return core_files_external::get_files($contextid, $component, $filearea, $itemid, $filepath, $filename);
 415     }
 416
 417     /**
 418      * Returns description of get_files returns
 419      *
 420      * @return external_single_structure
 421      * @since Moodle 2.0
 422      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 423      * @see core_files_external::get_files_returns()
 424      */
 425     public static function get_files_returns() {
 426         return core_files_external::get_files_returns();
 427     }
 428
 429     /**
 430      * Returns description of upload parameters
 431      *
 432      * @return external_function_parameters
 433      * @since Moodle 2.0
 434      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 435      * @see core_files_external::upload_parameters()
 436      */
 437     public static function upload_parameters() {
 438         return core_files_external::upload_parameters();
 439     }
 440
 441     /**
 442      * Uploading a file to moodle
 443      *
 444      * @param int $contextid
 445      * @param string $component
 446      * @param string $filearea
 447      * @param int $itemid
 448      * @param string $filepath
 449      * @param string $filename
 450      * @param string $filecontent
 451      * @return array
 452      * @since Moodle 2.0
 453      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 454      * @see core_files_external::upload()
 455      */
 456     public static function upload($contextid, $component, $filearea, $itemid, $filepath, $filename, $filecontent) {
 457         return core_files_external::upload($contextid, $component, $filearea, $itemid, $filepath, $filename, $filecontent);
 458     }
 459
 460     /**
 461      * Returns description of upload returns
 462      *
 463      * @return external_single_structure
 464      * @since Moodle 2.0
 465      * @deprecated Moodle 2.2 MDL-29106 - Please do not call this function any more.
 466      * @see core_files_external::upload_returns()
 467      */
 468     public static function upload_returns() {
 469         return core_files_external::upload_returns();
 470     }
 471 }