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Differences Between: [Versions 310 and 402] [Versions 311 and 402] [Versions 39 and 402] [Versions 400 and 402]

   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   * Class communication
  19   *
  20   * @package    core
  21   * @copyright  2017 Marina Glancy
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  namespace core\hub;
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  use moodle_exception;
  29  use curl;
  30  use stdClass;
  31  use coding_exception;
  32  use moodle_url;
  33  
  34  /**
  35   * Provides methods to communicate with the hub (sites directory) web services.
  36   *
  37   * @package    core
  38   * @copyright  2017 Marina Glancy
  39   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  40   */
  41  class api {
  42  
  43      /** @var File type: Course screenshot */
  44      const HUB_SCREENSHOT_FILE_TYPE = 'screenshot';
  45  
  46      /** @var File type: Hub screenshot */
  47      const HUB_HUBSCREENSHOT_FILE_TYPE = 'hubscreenshot';
  48  
  49      /** @var File type: Backup */
  50      const HUB_BACKUP_FILE_TYPE = 'backup';
  51  
  52      /**
  53       * Calls a remote function exposed via web services on the hub.
  54       *
  55       * @param string $function name of WS function
  56       * @param array $data parameters of WS function
  57       * @param bool $allowpublic allow request without registration on the hub
  58       * @return mixed depends on the function
  59       * @throws moodle_exception
  60       */
  61      protected static function call($function, array $data = [], $allowpublic = false) {
  62  
  63          $token = registration::get_token() ?: 'publichub';
  64          if (!$allowpublic && $token === 'publichub') {
  65              // This will throw an exception.
  66              registration::require_registration();
  67          }
  68  
  69          return self::call_rest($token, $function, $data);
  70      }
  71  
  72      /**
  73       * Performs a REST request to the hub site (using the GET method).
  74       *
  75       * @param string $token
  76       * @param string $function
  77       * @param array $data
  78       * @return mixed
  79       * @throws moodle_exception
  80       */
  81      protected static function call_rest($token, $function, array $data) {
  82          $params = [
  83                  'wstoken' => $token,
  84                  'wsfunction' => $function,
  85                  'moodlewsrestformat' => 'json'
  86              ] + $data;
  87  
  88          $curl = new curl();
  89          $serverurl = HUB_MOODLEORGHUBURL . "/local/hub/webservice/webservices.php";
  90          $query = http_build_query($params, '', '&');
  91          $curloutput = @json_decode($curl->post($serverurl, $query), true);
  92          $info = $curl->get_info();
  93          if ($curl->get_errno()) {
  94              // Connection error.
  95              throw new moodle_exception('errorconnect', 'hub', '', $curl->error);
  96          } else if (isset($curloutput['exception'])) {
  97              // Exception occurred on the remote side.
  98              self::process_curl_exception($token, $curloutput);
  99          } else if ($info['http_code'] != 200) {
 100              throw new moodle_exception('errorconnect', 'hub', '', $info['http_code']);
 101          } else {
 102              return $curloutput;
 103          }
 104      }
 105  
 106      /**
 107       * Analyses exception received from the hub server.
 108       *
 109       * @param string $token token used for CURL request
 110       * @param array $curloutput output from CURL request
 111       * @throws moodle_exception
 112       */
 113      protected static function process_curl_exception($token, $curloutput) {
 114          if (!isset($curloutput['exception'])) {
 115              return;
 116          }
 117          if ($token === registration::get_token()) {
 118              // Check if registration token was rejected or there are other problems with registration.
 119              if (($curloutput['exception'] === 'moodle_exception' && $curloutput['errorcode'] === 'invalidtoken')
 120                      || $curloutput['exception'] === 'registration_exception') {
 121                  // Force admin to repeat site registration process.
 122                  registration::reset_token();
 123                  throw new moodle_exception('errorwstokenreset', 'hub', '', $curloutput['message']);
 124              }
 125          }
 126          throw new moodle_exception('errorws', 'hub', '', $curloutput['message']);
 127      }
 128  
 129      /**
 130       * Update site registration on the hub.
 131       *
 132       * @param array $siteinfo
 133       * @throws moodle_exception
 134       */
 135      public static function update_registration(array $siteinfo) {
 136          $params = array('siteinfo' => $siteinfo, 'validateurl' => 1);
 137          self::call('hub_update_site_info', $params);
 138      }
 139  
 140      /**
 141       * Returns information about the hub.
 142       *
 143       * Example of the return array:
 144       * {
 145       *     "courses": 384,
 146       *     "description": "Official Moodle sites directory.",
 147       *     "downloadablecourses": 0,
 148       *     "enrollablecourses": 0,
 149       *     "hublogo": 1,
 150       *     "language": "en",
 151       *     "name": "moodle",
 152       *     "sites": 274175,
 153       *     "url": "https://stats.moodle.org",
 154       *     "imgurl": "https://stats.moodle.org/local/hub/webservice/download.php?filetype=hubscreenshot"
 155       * }
 156       *
 157       * @return array
 158       * @throws moodle_exception
 159       */
 160      public static function get_hub_info() {
 161          $info = self::call('hub_get_info', [], true);
 162          $info['imgurl'] = new moodle_url(HUB_MOODLEORGHUBURL . '/local/hub/webservice/download.php',
 163              ['filetype' => self::HUB_HUBSCREENSHOT_FILE_TYPE]);
 164          return $info;
 165      }
 166  
 167      /**
 168       * Calls WS function hub_get_courses
 169       *
 170       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 171       *
 172       * Parameter $options may have any of these fields:
 173       * [
 174       *     'ids' => new external_multiple_structure(new external_value(PARAM_INTEGER, 'id of a course in the hub course
 175       *          directory'), 'ids of course', VALUE_OPTIONAL),
 176       *     'sitecourseids' => new external_multiple_structure(new external_value(PARAM_INTEGER, 'id of a course in the
 177       *          site'), 'ids of course in the site', VALUE_OPTIONAL),
 178       *     'coverage' => new external_value(PARAM_TEXT, 'coverage', VALUE_OPTIONAL),
 179       *     'licenceshortname' => new external_value(PARAM_ALPHANUMEXT, 'licence short name', VALUE_OPTIONAL),
 180       *     'subject' => new external_value(PARAM_ALPHANUM, 'subject', VALUE_OPTIONAL),
 181       *     'audience' => new external_value(PARAM_ALPHA, 'audience', VALUE_OPTIONAL),
 182       *     'educationallevel' => new external_value(PARAM_ALPHA, 'educational level', VALUE_OPTIONAL),
 183       *     'language' => new external_value(PARAM_ALPHANUMEXT, 'language', VALUE_OPTIONAL),
 184       *     'orderby' => new external_value(PARAM_ALPHA, 'orderby method: newest, eldest, publisher, fullname,
 185       *          ratingaverage', VALUE_OPTIONAL),
 186       *     'givememore' => new external_value(PARAM_INT, 'next range of result - range size being set by the hub
 187       *          server ', VALUE_OPTIONAL),
 188       *     'allsitecourses' => new external_value(PARAM_INTEGER,
 189       *          'if 1 return all not visible and visible courses whose siteid is the site
 190       *          matching token. Only courses of this site are returned.
 191       *          givememore parameter is ignored if this param = 1.
 192       *          In case of public token access, this param option is ignored', VALUE_DEFAULT, 0),
 193       * ]
 194       *
 195       * Each course in the returned array of courses will have fields:
 196       * [
 197       *     'id' => new external_value(PARAM_INTEGER, 'id'),
 198       *     'fullname' => new external_value(PARAM_TEXT, 'course name'),
 199       *     'shortname' => new external_value(PARAM_TEXT, 'course short name'),
 200       *     'description' => new external_value(PARAM_TEXT, 'course description'),
 201       *     'language' => new external_value(PARAM_ALPHANUMEXT, 'course language'),
 202       *     'publishername' => new external_value(PARAM_TEXT, 'publisher name'),
 203       *     'publisheremail' => new external_value(PARAM_EMAIL, 'publisher email', VALUE_OPTIONAL),
 204       *     'privacy' => new external_value(PARAM_INT, 'privacy: published or not', VALUE_OPTIONAL),
 205       *     'sitecourseid' => new external_value(PARAM_INT, 'course id on the site', VALUE_OPTIONAL),
 206       *     'contributornames' => new external_value(PARAM_TEXT, 'contributor names', VALUE_OPTIONAL),
 207       *     'coverage' => new external_value(PARAM_TEXT, 'coverage', VALUE_OPTIONAL),
 208       *     'creatorname' => new external_value(PARAM_TEXT, 'creator name'),
 209       *     'licenceshortname' => new external_value(PARAM_ALPHANUMEXT, 'licence short name'),
 210       *     'subject' => new external_value(PARAM_ALPHANUM, 'subject'),
 211       *     'audience' => new external_value(PARAM_ALPHA, 'audience'),
 212       *     'educationallevel' => new external_value(PARAM_ALPHA, 'educational level'),
 213       *     'creatornotes' => new external_value(PARAM_RAW, 'creator notes'),
 214       *     'creatornotesformat' => new external_value(PARAM_INTEGER, 'notes format'),
 215       *     'demourl' => new external_value(PARAM_URL, 'demo URL', VALUE_OPTIONAL),
 216       *     'courseurl' => new external_value(PARAM_URL, 'course URL', VALUE_OPTIONAL),
 217       *     'backupsize' => new external_value(PARAM_INT, 'course backup size in bytes', VALUE_OPTIONAL),
 218       *     'enrollable' => new external_value(PARAM_BOOL, 'is the course enrollable'),
 219       *     'screenshots' => new external_value(PARAM_INT, 'total number of screenshots'),
 220       *     'timemodified' => new external_value(PARAM_INT, 'time of last modification - timestamp'),
 221       *     'contents' => new external_multiple_structure(new external_single_structure(
 222       *         array(
 223       *             'moduletype' => new external_value(PARAM_ALPHA, 'the type of module (activity/block)'),
 224       *             'modulename' => new external_value(PARAM_TEXT, 'the name of the module (forum, resource etc)'),
 225       *             'contentcount' => new external_value(PARAM_INT, 'how many time the module is used in the course'),
 226       *         )), 'contents', VALUE_OPTIONAL),
 227       *     'rating' => new external_single_structure (
 228       *         array(
 229       *              'aggregate' =>  new external_value(PARAM_FLOAT, 'Rating average', VALUE_OPTIONAL),
 230       *              'scaleid' => new external_value(PARAM_INT, 'Rating scale'),
 231       *              'count' => new external_value(PARAM_INT, 'Rating count'),
 232       *         ), 'rating', VALUE_OPTIONAL),
 233       *     'comments' => new external_multiple_structure(new external_single_structure (
 234       *          array(
 235       *              'comment' => new external_value(PARAM_TEXT, 'the comment'),
 236       *              'commentator' => new external_value(PARAM_TEXT, 'the name of commentator'),
 237       *              'date' => new external_value(PARAM_INT, 'date of the comment'),
 238       *         )), 'contents', VALUE_OPTIONAL),
 239       *     'outcomes' => new external_multiple_structure(new external_single_structure(
 240       *          array(
 241       *              'fullname' => new external_value(PARAM_TEXT, 'the outcome fullname')
 242       *          )), 'outcomes', VALUE_OPTIONAL)
 243       * ]
 244       *
 245       * Additional fields for each course:
 246       *      'screenshotbaseurl' (moodle_url) URL of the first screenshot, only set if $course['screenshots']>0
 247       *      'commenturl' (moodle_url) URL for comments
 248       *
 249       * @param string $search search string
 250       * @param bool $downloadable return downloadable courses
 251       * @param bool $enrollable return enrollable courses
 252       * @param array|\stdClass $options other options from the list of allowed options:
 253       *              'ids', 'sitecourseids', 'coverage', 'licenceshortname', 'subject', 'audience',
 254       *              'educationallevel', 'language', 'orderby', 'givememore', 'allsitecourses'
 255       * @return array of two elements: [$courses, $coursetotal]
 256       * @throws \coding_exception
 257       * @throws moodle_exception
 258       */
 259      public static function get_courses($search, $downloadable, $enrollable, $options) {
 260          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 261          return [[], 0];
 262      }
 263  
 264      /**
 265       * Unregister the site
 266       *
 267       * @throws moodle_exception
 268       */
 269      public static function unregister_site() {
 270          global $CFG;
 271          self::call('hub_unregister_site', ['url' => [$CFG->wwwroot]]);
 272      }
 273  
 274      /**
 275       * Unpublish courses
 276       *
 277       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 278       *
 279       * @param int[]|int $courseids
 280       * @throws moodle_exception
 281       */
 282      public static function unregister_courses($courseids) {
 283          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 284      }
 285  
 286      /**
 287       * Publish one course
 288       *
 289       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 290       *
 291       * Expected contents of $courseinfo:
 292       * [
 293       *     'sitecourseid' => new external_value(PARAM_INT, 'the id of the course on the publishing site'),
 294       *     'fullname' => new external_value(PARAM_TEXT, 'course name'),
 295       *     'shortname' => new external_value(PARAM_TEXT, 'course short name'),
 296       *     'description' => new external_value(PARAM_TEXT, 'course description'),
 297       *     'language' => new external_value(PARAM_ALPHANUMEXT, 'course language'),
 298       *     'publishername' => new external_value(PARAM_TEXT, 'publisher name'),
 299       *     'publisheremail' => new external_value(PARAM_EMAIL, 'publisher email'),
 300       *     'contributornames' => new external_value(PARAM_TEXT, 'contributor names'),
 301       *     'coverage' => new external_value(PARAM_TEXT, 'coverage'),
 302       *     'creatorname' => new external_value(PARAM_TEXT, 'creator name'),
 303       *     'licenceshortname' => new external_value(PARAM_ALPHANUMEXT, 'licence short name'),
 304       *     'subject' => new external_value(PARAM_ALPHANUM, 'subject'),
 305       *     'audience' => new external_value(PARAM_ALPHA, 'audience'),
 306       *     'educationallevel' => new external_value(PARAM_ALPHA, 'educational level'),
 307       *     'creatornotes' => new external_value(PARAM_RAW, 'creator notes'),
 308       *     'creatornotesformat' => new external_value(PARAM_INTEGER, 'notes format'),
 309       *     'demourl' => new external_value(PARAM_URL, 'demo URL', VALUE_OPTIONAL),
 310       *     'courseurl' => new external_value(PARAM_URL, 'course URL', VALUE_OPTIONAL),
 311       *     'enrollable' => new external_value(PARAM_BOOL, 'is the course enrollable', VALUE_DEFAULT, 0),
 312       *     'screenshots' => new external_value(PARAM_INT, 'the number of screenhots', VALUE_OPTIONAL),
 313       *     'deletescreenshots' => new external_value(PARAM_INT, 'ask to delete all the existing screenshot files
 314       *          (it does not reset the screenshot number)', VALUE_DEFAULT, 0),
 315       *     'contents' => new external_multiple_structure(new external_single_structure(
 316       *          array(
 317       *              'moduletype' => new external_value(PARAM_ALPHA, 'the type of module (activity/block)'),
 318       *              'modulename' => new external_value(PARAM_TEXT, 'the name of the module (forum, resource etc)'),
 319       *              'contentcount' => new external_value(PARAM_INT, 'how many time the module is used in the course'),
 320       *          )), 'contents', VALUE_OPTIONAL),
 321       *     'outcomes' => new external_multiple_structure(new external_single_structure(
 322       *         array(
 323       *              'fullname' => new external_value(PARAM_TEXT, 'the outcome fullname')
 324       *          )), 'outcomes', VALUE_OPTIONAL)
 325       * ]
 326       *
 327       * @param array|\stdClass $courseinfo
 328       * @return int id of the published course on the hub
 329       * @throws moodle_exception if the communication with the hub failed or the course could not be published
 330       */
 331      public static function register_course($courseinfo) {
 332          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 333          throw new moodle_exception('errorcoursewronglypublished', 'hub');
 334      }
 335  
 336      /**
 337       * Uploads a screenshot for the published course
 338       *
 339       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 340       *
 341       * @param int $hubcourseid id of the published course on the hub, it must be published from this site
 342       * @param \stored_file $file
 343       * @param int $screenshotnumber ordinal number of the screenshot
 344       */
 345      public static function add_screenshot($hubcourseid, \stored_file $file, $screenshotnumber) {
 346          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 347      }
 348  
 349      /**
 350       * Downloads course backup
 351       *
 352       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 353       *
 354       * @param int $hubcourseid id of the course on the hub
 355       * @param string $path local path (in tempdir) to save the downloaded backup to.
 356       */
 357      public static function download_course_backup($hubcourseid, $path) {
 358          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 359      }
 360  
 361      /**
 362       * Uploads a course backup
 363       *
 364       * @deprecated since Moodle 3.8. Moodle.net has been sunsetted making this function useless.
 365       *
 366       * @param int $hubcourseid id of the published course on the hub, it must be published from this site
 367       * @param \stored_file $backupfile
 368       */
 369      public static function upload_course_backup($hubcourseid, \stored_file $backupfile) {
 370          debugging("This function has been deprecated as part of the Moodle.net sunsetting process.");
 371      }
 372  }