enrol/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 course participation api.
  20  *
  21  * This api is mostly read only, the actual enrol and unenrol
  22  * support is in each enrol plugin.
  23  *
  24  * @package    core_enrol
  25  * @category   external
  26  * @copyright  2010 Jerome Mouneyrac
  27  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  28  */
  29
  30 defined('MOODLE_INTERNAL') || die();
  31
  32 require_once("$CFG->libdir/externallib.php");
  33
  34 /**
  35  * Enrol external functions
  36  *
  37  * @package    core_enrol
  38  * @category   external
  39  * @copyright  2011 Jerome Mouneyrac
  40  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  41  * @since Moodle 2.2
  42  */
  43 class core_enrol_external extends external_api {
  44
  45     /**
  46      * Returns description of method parameters
  47      *
  48      * @return external_function_parameters
  49      * @since Moodle 2.4
  50      */
  51     public static function get_enrolled_users_with_capability_parameters() {
  52         return new external_function_parameters(
  53             array (
  54                 'coursecapabilities' => new external_multiple_structure(
  55                     new external_single_structure(
  56                         array (
  57                             'courseid' => new external_value(PARAM_INT, 'Course ID number in the Moodle course table'),
  58                             'capabilities' => new external_multiple_structure(
  59                                 new external_value(PARAM_CAPABILITY, 'Capability name, such as mod/forum:viewdiscussion')),
  60                         )
  61                     )
  62                 , 'course id and associated capability name'),
  63                  'options'  => new external_multiple_structure(
  64                     new external_single_structure(
  65                         array(
  66                             'name'  => new external_value(PARAM_ALPHANUMEXT, 'option name'),
  67                             'value' => new external_value(PARAM_RAW, 'option value')
  68                         )
  69                     ), 'Option names:
  70                             * groupid (integer) return only users in this group id. Requires \'moodle/site:accessallgroups\' .
  71                             * onlyactive (integer) only users with active enrolments. Requires \'moodle/course:enrolreview\' .
  72                             * userfields (\'string, string, ...\') return only the values of these user fields.
  73                             * limitfrom (integer) sql limit from.
  74                             * limitnumber (integer) max number of users per course and capability.', VALUE_DEFAULT, array())
  75             )
  76         );
  77     }
  78
  79     /**
  80      * Return users that have the capabilities for each course specified. For each course and capability specified,
  81      * a list of the users that are enrolled in the course and have that capability are returned.
  82      *
  83      * @param array $coursecapabilities array of course ids and associated capability names {courseid, {capabilities}}
  84      * @return array An array of arrays describing users for each associated courseid and capability
  85      * @since  Moodle 2.4
  86      */
  87     public static function get_enrolled_users_with_capability($coursecapabilities, $options) {
  88         global $CFG, $DB;
  89
  90         require_once($CFG->dirroot . '/course/lib.php');
  91         require_once($CFG->dirroot . "/user/lib.php");
  92
  93         if (empty($coursecapabilities)) {
  94             throw new invalid_parameter_exception('Parameter can not be empty');
  95         }
  96         $params = self::validate_parameters(self::get_enrolled_users_with_capability_parameters(),
  97             array ('coursecapabilities' => $coursecapabilities,  'options'=>$options));
  98         $result = array();
  99         $userlist = array();
 100         $groupid        = 0;
 101         $onlyactive     = false;
 102         $userfields     = array();
 103         $limitfrom = 0;
 104         $limitnumber = 0;
 105         foreach ($params['options'] as $option) {
 106             switch ($option['name']) {
 107                 case 'groupid':
 108                     $groupid = (int)$option['value'];
 109                     break;
 110                 case 'onlyactive':
 111                     $onlyactive = !empty($option['value']);
 112                     break;
 113                 case 'userfields':
 114                     $thefields = explode(',', $option['value']);
 115                     foreach ($thefields as $f) {
 116                         $userfields[] = clean_param($f, PARAM_ALPHANUMEXT);
 117                     }
 118                     break;
 119                 case 'limitfrom' :
 120                     $limitfrom = clean_param($option['value'], PARAM_INT);
 121                     break;
 122                 case 'limitnumber' :
 123                     $limitnumber = clean_param($option['value'], PARAM_INT);
 124                     break;
 125             }
 126         }
 127
 128         foreach ($params['coursecapabilities'] as $coursecapability) {
 129             $courseid = $coursecapability['courseid'];
 130             $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
 131             $coursecontext = context_course::instance($courseid);
 132             if (!$coursecontext) {
 133                 throw new moodle_exception('cannotfindcourse', 'error', '', null,
 134                         'The course id ' . $courseid . ' doesn\'t exist.');
 135             }
 136             if ($courseid == SITEID) {
 137                 $context = context_system::instance();
 138             } else {
 139                 $context = $coursecontext;
 140             }
 141             try {
 142                 self::validate_context($context);
 143             } catch (Exception $e) {
 144                 $exceptionparam = new stdClass();
 145                 $exceptionparam->message = $e->getMessage();
 146                 $exceptionparam->courseid = $params['courseid'];
 147                 throw new moodle_exception(get_string('errorcoursecontextnotvalid' , 'webservice', $exceptionparam));
 148             }
 149
 150             course_require_view_participants($context);
 151
 152             // The accessallgroups capability is needed to use this option.
 153             if (!empty($groupid) && groups_is_member($groupid)) {
 154                 require_capability('moodle/site:accessallgroups', $coursecontext);
 155             }
 156             // The course:enrolereview capability is needed to use this option.
 157             if ($onlyactive) {
 158                 require_capability('moodle/course:enrolreview', $coursecontext);
 159             }
 160
 161             // To see the permissions of others role:review capability is required.
 162             require_capability('moodle/role:review', $coursecontext);
 163             foreach ($coursecapability['capabilities'] as $capability) {
 164                 $courseusers['courseid'] = $courseid;
 165                 $courseusers['capability'] = $capability;
 166
 167                 list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext, $capability, $groupid, $onlyactive);
 168                 $enrolledparams['courseid'] = $courseid;
 169
 170                 $sql = "SELECT u.*, COALESCE(ul.timeaccess, 0) AS lastcourseaccess
 171                           FROM {user} u
 172                      LEFT JOIN {user_lastaccess} ul ON (ul.userid = u.id AND ul.courseid = :courseid)
 173                          WHERE u.id IN ($enrolledsql)
 174                       ORDER BY u.id ASC";
 175
 176                 $enrolledusers = $DB->get_recordset_sql($sql, $enrolledparams, $limitfrom, $limitnumber);
 177                 $users = array();
 178                 foreach ($enrolledusers as $courseuser) {
 179                     if ($userdetails = user_get_user_details($courseuser, $course, $userfields)) {
 180                         $users[] = $userdetails;
 181                     }
 182                 }
 183                 $enrolledusers->close();
 184                 $courseusers['users'] = $users;
 185                 $result[] = $courseusers;
 186             }
 187         }
 188         return $result;
 189     }
 190
 191     /**
 192      * Returns description of method result value
 193      *
 194      * @return external_multiple_structure
 195      * @since Moodle 2.4
 196      */
 197     public static function get_enrolled_users_with_capability_returns() {
 198         return  new external_multiple_structure( new external_single_structure (
 199                 array (
 200                     'courseid' => new external_value(PARAM_INT, 'Course ID number in the Moodle course table'),
 201                     'capability' => new external_value(PARAM_CAPABILITY, 'Capability name'),
 202                     'users' => new external_multiple_structure(
 203                         new external_single_structure(
 204                 array(
 205                     'id'    => new external_value(PARAM_INT, 'ID of the user'),
 206                     'username'    => new external_value(PARAM_RAW, 'Username', VALUE_OPTIONAL),
 207                     'firstname'   => new external_value(PARAM_NOTAGS, 'The first name(s) of the user', VALUE_OPTIONAL),
 208                     'lastname'    => new external_value(PARAM_NOTAGS, 'The family name of the user', VALUE_OPTIONAL),
 209                     'fullname'    => new external_value(PARAM_NOTAGS, 'The fullname of the user'),
 210                     'email'       => new external_value(PARAM_TEXT, 'Email address', VALUE_OPTIONAL),
 211                     'address'     => new external_value(PARAM_MULTILANG, 'Postal address', VALUE_OPTIONAL),
 212                     'phone1'      => new external_value(PARAM_NOTAGS, 'Phone 1', VALUE_OPTIONAL),
 213                     'phone2'      => new external_value(PARAM_NOTAGS, 'Phone 2', VALUE_OPTIONAL),
 214                     'icq'         => new external_value(PARAM_NOTAGS, 'icq number', VALUE_OPTIONAL),
 215                     'skype'       => new external_value(PARAM_NOTAGS, 'skype id', VALUE_OPTIONAL),
 216                     'yahoo'       => new external_value(PARAM_NOTAGS, 'yahoo id', VALUE_OPTIONAL),
 217                     'aim'         => new external_value(PARAM_NOTAGS, 'aim id', VALUE_OPTIONAL),
 218                     'msn'         => new external_value(PARAM_NOTAGS, 'msn number', VALUE_OPTIONAL),
 219                     'department'  => new external_value(PARAM_TEXT, 'department', VALUE_OPTIONAL),
 220                     'institution' => new external_value(PARAM_TEXT, 'institution', VALUE_OPTIONAL),
 221                     'interests'   => new external_value(PARAM_TEXT, 'user interests (separated by commas)', VALUE_OPTIONAL),
 222                     'firstaccess' => new external_value(PARAM_INT, 'first access to the site (0 if never)', VALUE_OPTIONAL),
 223                     'lastaccess'  => new external_value(PARAM_INT, 'last access to the site (0 if never)', VALUE_OPTIONAL),
 224                     'lastcourseaccess'  => new external_value(PARAM_INT, 'last access to the course (0 if never)', VALUE_OPTIONAL),
 225                     'description' => new external_value(PARAM_RAW, 'User profile description', VALUE_OPTIONAL),
 226                     'descriptionformat' => new external_value(PARAM_INT, 'User profile description format', VALUE_OPTIONAL),
 227                     'city'        => new external_value(PARAM_NOTAGS, 'Home city of the user', VALUE_OPTIONAL),
 228                     'url'         => new external_value(PARAM_URL, 'URL of the user', VALUE_OPTIONAL),
 229                     'country'     => new external_value(PARAM_ALPHA, 'Country code of the user, such as AU or CZ', VALUE_OPTIONAL),
 230                     'profileimageurlsmall' => new external_value(PARAM_URL, 'User image profile URL - small', VALUE_OPTIONAL),
 231                     'profileimageurl' => new external_value(PARAM_URL, 'User image profile URL - big', VALUE_OPTIONAL),
 232                     'customfields' => new external_multiple_structure(
 233                         new external_single_structure(
 234                             array(
 235                                 'type'  => new external_value(PARAM_ALPHANUMEXT, 'The type of the custom field'),
 236                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 237                                 'name' => new external_value(PARAM_RAW, 'The name of the custom field'),
 238                                 'shortname' => new external_value(PARAM_RAW, 'The shortname of the custom field'),
 239                             )
 240                         ), 'User custom fields (also known as user profil fields)', VALUE_OPTIONAL),
 241                     'groups' => new external_multiple_structure(
 242                         new external_single_structure(
 243                             array(
 244                                 'id'  => new external_value(PARAM_INT, 'group id'),
 245                                 'name' => new external_value(PARAM_RAW, 'group name'),
 246                                 'description' => new external_value(PARAM_RAW, 'group description'),
 247                             )
 248                         ), 'user groups', VALUE_OPTIONAL),
 249                     'roles' => new external_multiple_structure(
 250                         new external_single_structure(
 251                             array(
 252                                 'roleid'       => new external_value(PARAM_INT, 'role id'),
 253                                 'name'         => new external_value(PARAM_RAW, 'role name'),
 254                                 'shortname'    => new external_value(PARAM_ALPHANUMEXT, 'role shortname'),
 255                                 'sortorder'    => new external_value(PARAM_INT, 'role sortorder')
 256                             )
 257                         ), 'user roles', VALUE_OPTIONAL),
 258                     'preferences' => new external_multiple_structure(
 259                         new external_single_structure(
 260                             array(
 261                                 'name'  => new external_value(PARAM_RAW, 'The name of the preferences'),
 262                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 263                             )
 264                     ), 'User preferences', VALUE_OPTIONAL),
 265                     'enrolledcourses' => new external_multiple_structure(
 266                         new external_single_structure(
 267                             array(
 268                                 'id'  => new external_value(PARAM_INT, 'Id of the course'),
 269                                 'fullname' => new external_value(PARAM_RAW, 'Fullname of the course'),
 270                                 'shortname' => new external_value(PARAM_RAW, 'Shortname of the course')
 271                             )
 272                     ), 'Courses where the user is enrolled - limited by which courses the user is able to see', VALUE_OPTIONAL)
 273                 )
 274                         ), 'List of users that are enrolled in the course and have the specified capability'),
 275                     )
 276                 )
 277             );
 278     }
 279
 280     /**
 281      * Returns description of method parameters
 282      *
 283      * @return external_function_parameters
 284      */
 285     public static function get_users_courses_parameters() {
 286         return new external_function_parameters(
 287             array(
 288                 'userid' => new external_value(PARAM_INT, 'user id'),
 289                 'returnusercount' => new external_value(PARAM_BOOL,
 290                         'Include count of enrolled users for each course? This can add several seconds to the response time'
 291                             . ' if a user is on several large courses, so set this to false if the value will not be used to'
 292                             . ' improve performance.',
 293                         VALUE_DEFAULT, true),
 294             )
 295         );
 296     }
 297
 298     /**
 299      * Get list of courses user is enrolled in (only active enrolments are returned).
 300      * Please note the current user must be able to access the course, otherwise the course is not included.
 301      *
 302      * @param int $userid
 303      * @param bool $returnusercount
 304      * @return array of courses
 305      */
 306     public static function get_users_courses($userid, $returnusercount = true) {
 307         global $CFG, $USER, $DB;
 308
 309         require_once($CFG->dirroot . '/course/lib.php');
 310         require_once($CFG->libdir . '/completionlib.php');
 311
 312         // Do basic automatic PARAM checks on incoming data, using params description
 313         // If any problems are found then exceptions are thrown with helpful error messages
 314         $params = self::validate_parameters(self::get_users_courses_parameters(),
 315                 ['userid' => $userid, 'returnusercount' => $returnusercount]);
 316         $userid = $params['userid'];
 317         $returnusercount = $params['returnusercount'];
 318
 319         $courses = enrol_get_users_courses($userid, true, '*');
 320         $result = array();
 321
 322         // Get user data including last access to courses.
 323         $user = get_complete_user_data('id', $userid);
 324         $sameuser = $USER->id == $userid;
 325
 326         // Retrieve favourited courses (starred).
 327         $favouritecourseids = array();
 328         if ($sameuser) {
 329             $ufservice = \core_favourites\service_factory::get_service_for_user_context(\context_user::instance($userid));
 330             $favourites = $ufservice->find_favourites_by_type('core_course', 'courses');
 331
 332             if ($favourites) {
 333                 $favouritecourseids = array_flip(array_map(
 334                     function($favourite) {
 335                         return $favourite->itemid;
 336                     }, $favourites));
 337             }
 338         }
 339
 340         foreach ($courses as $course) {
 341             $context = context_course::instance($course->id, IGNORE_MISSING);
 342             try {
 343                 self::validate_context($context);
 344             } catch (Exception $e) {
 345                 // current user can not access this course, sorry we can not disclose who is enrolled in this course!
 346                 continue;
 347             }
 348
 349             if (!$sameuser and !course_can_view_participants($context)) {
 350                 // we need capability to view participants
 351                 continue;
 352             }
 353
 354             if ($returnusercount) {
 355                 list($enrolledsqlselect, $enrolledparams) = get_enrolled_sql($context);
 356                 $enrolledsql = "SELECT COUNT('x') FROM ($enrolledsqlselect) enrolleduserids";
 357                 $enrolledusercount = $DB->count_records_sql($enrolledsql, $enrolledparams);
 358             }
 359
 360             $displayname = external_format_string(get_course_display_name_for_list($course), $context->id);
 361             list($course->summary, $course->summaryformat) =
 362                 external_format_text($course->summary, $course->summaryformat, $context->id, 'course', 'summary', null);
 363             $course->fullname = external_format_string($course->fullname, $context->id);
 364             $course->shortname = external_format_string($course->shortname, $context->id);
 365
 366             $progress = null;
 367             $completed = null;
 368             $completionhascriteria = false;
 369             $completionusertracked = false;
 370
 371             // Return only private information if the user should be able to see it.
 372             if ($sameuser || completion_can_view_data($userid, $course)) {
 373                 if ($course->enablecompletion) {
 374                     $completion = new completion_info($course);
 375                     $completed = $completion->is_course_complete($userid);
 376                     $completionhascriteria = $completion->has_criteria();
 377                     $completionusertracked = $completion->is_tracked_user($userid);
 378                     $progress = \core_completion\progress::get_course_progress_percentage($course, $userid);
 379                 }
 380             }
 381
 382             $lastaccess = null;
 383             // Check if last access is a hidden field.
 384             $hiddenfields = array_flip(explode(',', $CFG->hiddenuserfields));
 385             $canviewlastaccess = $sameuser || !isset($hiddenfields['lastaccess']);
 386             if (!$canviewlastaccess) {
 387                 $canviewlastaccess = has_capability('moodle/course:viewhiddenuserfields', $context);
 388             }
 389
 390             if ($canviewlastaccess && isset($user->lastcourseaccess[$course->id])) {
 391                 $lastaccess = $user->lastcourseaccess[$course->id];
 392             }
 393
 394             $hidden = false;
 395             if ($sameuser) {
 396                 $hidden = boolval(get_user_preferences('block_myoverview_hidden_course_' . $course->id, 0));
 397             }
 398
 399             // Retrieve course overview used files.
 400             $courselist = new core_course_list_element($course);
 401             $overviewfiles = array();
 402             foreach ($courselist->get_course_overviewfiles() as $file) {
 403                 $fileurl = moodle_url::make_webservice_pluginfile_url($file->get_contextid(), $file->get_component(),
 404                                                                         $file->get_filearea(), null, $file->get_filepath(),
 405                                                                         $file->get_filename())->out(false);
 406                 $overviewfiles[] = array(
 407                     'filename' => $file->get_filename(),
 408                     'fileurl' => $fileurl,
 409                     'filesize' => $file->get_filesize(),
 410                     'filepath' => $file->get_filepath(),
 411                     'mimetype' => $file->get_mimetype(),
 412                     'timemodified' => $file->get_timemodified(),
 413                 );
 414             }
 415
 416             $courseresult = [
 417                 'id' => $course->id,
 418                 'shortname' => $course->shortname,
 419                 'fullname' => $course->fullname,
 420                 'displayname' => $displayname,
 421                 'idnumber' => $course->idnumber,
 422                 'visible' => $course->visible,
 423                 'summary' => $course->summary,
 424                 'summaryformat' => $course->summaryformat,
 425                 'format' => $course->format,
 426                 'showgrades' => $course->showgrades,
 427                 'lang' => clean_param($course->lang, PARAM_LANG),
 428                 'enablecompletion' => $course->enablecompletion,
 429                 'completionhascriteria' => $completionhascriteria,
 430                 'completionusertracked' => $completionusertracked,
 431                 'category' => $course->category,
 432                 'progress' => $progress,
 433                 'completed' => $completed,
 434                 'startdate' => $course->startdate,
 435                 'enddate' => $course->enddate,
 436                 'marker' => $course->marker,
 437                 'lastaccess' => $lastaccess,
 438                 'isfavourite' => isset($favouritecourseids[$course->id]),
 439                 'hidden' => $hidden,
 440                 'overviewfiles' => $overviewfiles,
 441             ];
 442             if ($returnusercount) {
 443                 $courseresult['enrolledusercount'] = $enrolledusercount;
 444             }
 445             $result[] = $courseresult;
 446         }
 447
 448         return $result;
 449     }
 450
 451     /**
 452      * Returns description of method result value
 453      *
 454      * @return external_description
 455      */
 456     public static function get_users_courses_returns() {
 457         return new external_multiple_structure(
 458             new external_single_structure(
 459                 array(
 460                     'id'        => new external_value(PARAM_INT, 'id of course'),
 461                     'shortname' => new external_value(PARAM_RAW, 'short name of course'),
 462                     'fullname'  => new external_value(PARAM_RAW, 'long name of course'),
 463                     'displayname' => new external_value(PARAM_TEXT, 'course display name for lists.', VALUE_OPTIONAL),
 464                     'enrolledusercount' => new external_value(PARAM_INT, 'Number of enrolled users in this course',
 465                             VALUE_OPTIONAL),
 466                     'idnumber'  => new external_value(PARAM_RAW, 'id number of course'),
 467                     'visible'   => new external_value(PARAM_INT, '1 means visible, 0 means not yet visible course'),
 468                     'summary'   => new external_value(PARAM_RAW, 'summary', VALUE_OPTIONAL),
 469                     'summaryformat' => new external_format_value('summary', VALUE_OPTIONAL),
 470                     'format'    => new external_value(PARAM_PLUGIN, 'course format: weeks, topics, social, site', VALUE_OPTIONAL),
 471                     'showgrades' => new external_value(PARAM_BOOL, 'true if grades are shown, otherwise false', VALUE_OPTIONAL),
 472                     'lang'      => new external_value(PARAM_LANG, 'forced course language', VALUE_OPTIONAL),
 473                     'enablecompletion' => new external_value(PARAM_BOOL, 'true if completion is enabled, otherwise false',
 474                                                                 VALUE_OPTIONAL),
 475                     'completionhascriteria' => new external_value(PARAM_BOOL, 'If completion criteria is set.', VALUE_OPTIONAL),
 476                     'completionusertracked' => new external_value(PARAM_BOOL, 'If the user is completion tracked.', VALUE_OPTIONAL),
 477                     'category' => new external_value(PARAM_INT, 'course category id', VALUE_OPTIONAL),
 478                     'progress' => new external_value(PARAM_FLOAT, 'Progress percentage', VALUE_OPTIONAL),
 479                     'completed' => new external_value(PARAM_BOOL, 'Whether the course is completed.', VALUE_OPTIONAL),
 480                     'startdate' => new external_value(PARAM_INT, 'Timestamp when the course start', VALUE_OPTIONAL),
 481                     'enddate' => new external_value(PARAM_INT, 'Timestamp when the course end', VALUE_OPTIONAL),
 482                     'marker' => new external_value(PARAM_INT, 'Course section marker.', VALUE_OPTIONAL),
 483                     'lastaccess' => new external_value(PARAM_INT, 'Last access to the course (timestamp).', VALUE_OPTIONAL),
 484                     'isfavourite' => new external_value(PARAM_BOOL, 'If the user marked this course a favourite.', VALUE_OPTIONAL),
 485                     'hidden' => new external_value(PARAM_BOOL, 'If the user hide the course from the dashboard.', VALUE_OPTIONAL),
 486                     'overviewfiles' => new external_files('Overview files attached to this course.', VALUE_OPTIONAL),
 487                 )
 488             )
 489         );
 490     }
 491
 492     /**
 493      * Returns description of method parameters value
 494      *
 495      * @return external_description
 496      */
 497     public static function get_potential_users_parameters() {
 498         return new external_function_parameters(
 499             array(
 500                 'courseid' => new external_value(PARAM_INT, 'course id'),
 501                 'enrolid' => new external_value(PARAM_INT, 'enrolment id'),
 502                 'search' => new external_value(PARAM_RAW, 'query'),
 503                 'searchanywhere' => new external_value(PARAM_BOOL, 'find a match anywhere, or only at the beginning'),
 504                 'page' => new external_value(PARAM_INT, 'Page number'),
 505                 'perpage' => new external_value(PARAM_INT, 'Number per page'),
 506             )
 507         );
 508     }
 509
 510     /**
 511      * Get potential users.
 512      *
 513      * @param int $courseid Course id
 514      * @param int $enrolid Enrolment id
 515      * @param string $search The query
 516      * @param boolean $searchanywhere Match anywhere in the string
 517      * @param int $page Page number
 518      * @param int $perpage Max per page
 519      * @return array An array of users
 520      */
 521     public static function get_potential_users($courseid, $enrolid, $search, $searchanywhere, $page, $perpage) {
 522         global $PAGE, $DB, $CFG;
 523
 524         require_once($CFG->dirroot.'/enrol/locallib.php');
 525         require_once($CFG->dirroot.'/user/lib.php');
 526
 527         $params = self::validate_parameters(
 528             self::get_potential_users_parameters(),
 529             array(
 530                 'courseid' => $courseid,
 531                 'enrolid' => $enrolid,
 532                 'search' => $search,
 533                 'searchanywhere' => $searchanywhere,
 534                 'page' => $page,
 535                 'perpage' => $perpage
 536             )
 537         );
 538         $context = context_course::instance($params['courseid']);
 539         try {
 540             self::validate_context($context);
 541         } catch (Exception $e) {
 542             $exceptionparam = new stdClass();
 543             $exceptionparam->message = $e->getMessage();
 544             $exceptionparam->courseid = $params['courseid'];
 545             throw new moodle_exception('errorcoursecontextnotvalid' , 'webservice', '', $exceptionparam);
 546         }
 547         require_capability('moodle/course:enrolreview', $context);
 548
 549         $course = $DB->get_record('course', array('id' => $params['courseid']));
 550         $manager = new course_enrolment_manager($PAGE, $course);
 551
 552         $users = $manager->get_potential_users($params['enrolid'],
 553                                                $params['search'],
 554                                                $params['searchanywhere'],
 555                                                $params['page'],
 556                                                $params['perpage']);
 557
 558         $results = array();
 559         // Add also extra user fields.
 560         $requiredfields = array_merge(
 561             ['id', 'fullname', 'profileimageurl', 'profileimageurlsmall'],
 562             get_extra_user_fields($context)
 563         );
 564         foreach ($users['users'] as $id => $user) {
 565             // Note: We pass the course here to validate that the current user can at least view user details in this course.
 566             // The user we are looking at is not in this course yet though - but we only fetch the minimal set of
 567             // user records, and the user has been validated to have course:enrolreview in this course. Otherwise
 568             // there is no way to find users who aren't in the course in order to enrol them.
 569             if ($userdetails = user_get_user_details($user, $course, $requiredfields)) {
 570                 $results[] = $userdetails;
 571             }
 572         }
 573         return $results;
 574     }
 575
 576     /**
 577      * Returns description of method result value
 578      *
 579      * @return external_description
 580      */
 581     public static function get_potential_users_returns() {
 582         global $CFG;
 583         require_once($CFG->dirroot . '/user/externallib.php');
 584         return new external_multiple_structure(core_user_external::user_description());
 585     }
 586
 587     /**
 588      * Returns description of method parameters
 589      *
 590      * @return external_function_parameters
 591      */
 592     public static function get_enrolled_users_parameters() {
 593         return new external_function_parameters(
 594             array(
 595                 'courseid' => new external_value(PARAM_INT, 'course id'),
 596                 'options'  => new external_multiple_structure(
 597                     new external_single_structure(
 598                         array(
 599                             'name'  => new external_value(PARAM_ALPHANUMEXT, 'option name'),
 600                             'value' => new external_value(PARAM_RAW, 'option value')
 601                         )
 602                     ), 'Option names:
 603                             * withcapability (string) return only users with this capability. This option requires \'moodle/role:review\' on the course context.
 604                             * groupid (integer) return only users in this group id. If the course has groups enabled and this param
 605                                                 isn\'t defined, returns all the viewable users.
 606                                                 This option requires \'moodle/site:accessallgroups\' on the course context if the
 607                                                 user doesn\'t belong to the group.
 608                             * onlyactive (integer) return only users with active enrolments and matching time restrictions. This option requires \'moodle/course:enrolreview\' on the course context.
 609                             * userfields (\'string, string, ...\') return only the values of these user fields.
 610                             * limitfrom (integer) sql limit from.
 611                             * limitnumber (integer) maximum number of returned users.
 612                             * sortby (string) sort by id, firstname or lastname. For ordering like the site does, use siteorder.
 613                             * sortdirection (string) ASC or DESC',
 614                             VALUE_DEFAULT, array()),
 615             )
 616         );
 617     }
 618
 619     /**
 620      * Get course participants details
 621      *
 622      * @param int $courseid  course id
 623      * @param array $options options {
 624      *                                'name' => option name
 625      *                                'value' => option value
 626      *                               }
 627      * @return array An array of users
 628      */
 629     public static function get_enrolled_users($courseid, $options = array()) {
 630         global $CFG, $USER, $DB;
 631
 632         require_once($CFG->dirroot . '/course/lib.php');
 633         require_once($CFG->dirroot . "/user/lib.php");
 634
 635         $params = self::validate_parameters(
 636             self::get_enrolled_users_parameters(),
 637             array(
 638                 'courseid'=>$courseid,
 639                 'options'=>$options
 640             )
 641         );
 642         $withcapability = '';
 643         $groupid        = 0;
 644         $onlyactive     = false;
 645         $userfields     = array();
 646         $limitfrom = 0;
 647         $limitnumber = 0;
 648         $sortby = 'us.id';
 649         $sortparams = array();
 650         $sortdirection = 'ASC';
 651         foreach ($options as $option) {
 652             switch ($option['name']) {
 653             case 'withcapability':
 654                 $withcapability = $option['value'];
 655                 break;
 656             case 'groupid':
 657                 $groupid = (int)$option['value'];
 658                 break;
 659             case 'onlyactive':
 660                 $onlyactive = !empty($option['value']);
 661                 break;
 662             case 'userfields':
 663                 $thefields = explode(',', $option['value']);
 664                 foreach ($thefields as $f) {
 665                     $userfields[] = clean_param($f, PARAM_ALPHANUMEXT);
 666                 }
 667                 break;
 668             case 'limitfrom' :
 669                 $limitfrom = clean_param($option['value'], PARAM_INT);
 670                 break;
 671             case 'limitnumber' :
 672                 $limitnumber = clean_param($option['value'], PARAM_INT);
 673                 break;
 674             case 'sortby':
 675                 $sortallowedvalues = array('id', 'firstname', 'lastname', 'siteorder');
 676                 if (!in_array($option['value'], $sortallowedvalues)) {
 677                     throw new invalid_parameter_exception('Invalid value for sortby parameter (value: ' . $option['value'] . '),' .
 678                         'allowed values are: ' . implode(',', $sortallowedvalues));
 679                 }
 680                 if ($option['value'] == 'siteorder') {
 681                     list($sortby, $sortparams) = users_order_by_sql('us');
 682                 } else {
 683                     $sortby = 'us.' . $option['value'];
 684                 }
 685                 break;
 686             case 'sortdirection':
 687                 $sortdirection = strtoupper($option['value']);
 688                 $directionallowedvalues = array('ASC', 'DESC');
 689                 if (!in_array($sortdirection, $directionallowedvalues)) {
 690                     throw new invalid_parameter_exception('Invalid value for sortdirection parameter
 691                         (value: ' . $sortdirection . '),' . 'allowed values are: ' . implode(',', $directionallowedvalues));
 692                 }
 693                 break;
 694             }
 695         }
 696
 697         $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
 698         $coursecontext = context_course::instance($courseid, IGNORE_MISSING);
 699         if ($courseid == SITEID) {
 700             $context = context_system::instance();
 701         } else {
 702             $context = $coursecontext;
 703         }
 704         try {
 705             self::validate_context($context);
 706         } catch (Exception $e) {
 707             $exceptionparam = new stdClass();
 708             $exceptionparam->message = $e->getMessage();
 709             $exceptionparam->courseid = $params['courseid'];
 710             throw new moodle_exception('errorcoursecontextnotvalid' , 'webservice', '', $exceptionparam);
 711         }
 712
 713         course_require_view_participants($context);
 714
 715         // to overwrite this parameter, you need role:review capability
 716         if ($withcapability) {
 717             require_capability('moodle/role:review', $coursecontext);
 718         }
 719         // need accessallgroups capability if you want to overwrite this option
 720         if (!empty($groupid) && !groups_is_member($groupid)) {
 721             require_capability('moodle/site:accessallgroups', $coursecontext);
 722         }
 723         // to overwrite this option, you need course:enrolereview permission
 724         if ($onlyactive) {
 725             require_capability('moodle/course:enrolreview', $coursecontext);
 726         }
 727
 728         list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext, $withcapability, $groupid, $onlyactive);
 729         $ctxselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
 730         $ctxjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = u.id AND ctx.contextlevel = :contextlevel)";
 731         $enrolledparams['contextlevel'] = CONTEXT_USER;
 732
 733         $groupjoin = '';
 734         if (empty($groupid) && groups_get_course_groupmode($course) == SEPARATEGROUPS &&
 735                 !has_capability('moodle/site:accessallgroups', $coursecontext)) {
 736             // Filter by groups the user can view.
 737             $usergroups = groups_get_user_groups($course->id);
 738             if (!empty($usergroups['0'])) {
 739                 list($groupsql, $groupparams) = $DB->get_in_or_equal($usergroups['0'], SQL_PARAMS_NAMED);
 740                 $groupjoin = "JOIN {groups_members} gm ON (u.id = gm.userid AND gm.groupid $groupsql)";
 741                 $enrolledparams = array_merge($enrolledparams, $groupparams);
 742             } else {
 743                 // User doesn't belong to any group, so he can't see any user. Return an empty array.
 744                 return array();
 745             }
 746         }
 747         $sql = "SELECT us.*, COALESCE(ul.timeaccess, 0) AS lastcourseaccess
 748                   FROM {user} us
 749                   JOIN (
 750                       SELECT DISTINCT u.id $ctxselect
 751                         FROM {user} u $ctxjoin $groupjoin
 752                        WHERE u.id IN ($enrolledsql)
 753                   ) q ON q.id = us.id
 754              LEFT JOIN {user_lastaccess} ul ON (ul.userid = us.id AND ul.courseid = :courseid)
 755                 ORDER BY $sortby $sortdirection";
 756         $enrolledparams = array_merge($enrolledparams, $sortparams);
 757         $enrolledparams['courseid'] = $courseid;
 758
 759         $enrolledusers = $DB->get_recordset_sql($sql, $enrolledparams, $limitfrom, $limitnumber);
 760         $users = array();
 761         foreach ($enrolledusers as $user) {
 762             context_helper::preload_from_record($user);
 763             if ($userdetails = user_get_user_details($user, $course, $userfields)) {
 764                 $users[] = $userdetails;
 765             }
 766         }
 767         $enrolledusers->close();
 768
 769         return $users;
 770     }
 771
 772     /**
 773      * Returns description of method result value
 774      *
 775      * @return external_description
 776      */
 777     public static function get_enrolled_users_returns() {
 778         return new external_multiple_structure(
 779             new external_single_structure(
 780                 array(
 781                     'id'    => new external_value(PARAM_INT, 'ID of the user'),
 782                     'username'    => new external_value(PARAM_RAW, 'Username policy is defined in Moodle security config', VALUE_OPTIONAL),
 783                     'firstname'   => new external_value(PARAM_NOTAGS, 'The first name(s) of the user', VALUE_OPTIONAL),
 784                     'lastname'    => new external_value(PARAM_NOTAGS, 'The family name of the user', VALUE_OPTIONAL),
 785                     'fullname'    => new external_value(PARAM_NOTAGS, 'The fullname of the user'),
 786                     'email'       => new external_value(PARAM_TEXT, 'An email address - allow email as root@localhost', VALUE_OPTIONAL),
 787                     'address'     => new external_value(PARAM_TEXT, 'Postal address', VALUE_OPTIONAL),
 788                     'phone1'      => new external_value(PARAM_NOTAGS, 'Phone 1', VALUE_OPTIONAL),
 789                     'phone2'      => new external_value(PARAM_NOTAGS, 'Phone 2', VALUE_OPTIONAL),
 790                     'icq'         => new external_value(PARAM_NOTAGS, 'icq number', VALUE_OPTIONAL),
 791                     'skype'       => new external_value(PARAM_NOTAGS, 'skype id', VALUE_OPTIONAL),
 792                     'yahoo'       => new external_value(PARAM_NOTAGS, 'yahoo id', VALUE_OPTIONAL),
 793                     'aim'         => new external_value(PARAM_NOTAGS, 'aim id', VALUE_OPTIONAL),
 794                     'msn'         => new external_value(PARAM_NOTAGS, 'msn number', VALUE_OPTIONAL),
 795                     'department'  => new external_value(PARAM_TEXT, 'department', VALUE_OPTIONAL),
 796                     'institution' => new external_value(PARAM_TEXT, 'institution', VALUE_OPTIONAL),
 797                     'idnumber'    => new external_value(PARAM_RAW, 'An arbitrary ID code number perhaps from the institution', VALUE_OPTIONAL),
 798                     'interests'   => new external_value(PARAM_TEXT, 'user interests (separated by commas)', VALUE_OPTIONAL),
 799                     'firstaccess' => new external_value(PARAM_INT, 'first access to the site (0 if never)', VALUE_OPTIONAL),
 800                     'lastaccess'  => new external_value(PARAM_INT, 'last access to the site (0 if never)', VALUE_OPTIONAL),
 801                     'lastcourseaccess'  => new external_value(PARAM_INT, 'last access to the course (0 if never)', VALUE_OPTIONAL),
 802                     'description' => new external_value(PARAM_RAW, 'User profile description', VALUE_OPTIONAL),
 803                     'descriptionformat' => new external_format_value('description', VALUE_OPTIONAL),
 804                     'city'        => new external_value(PARAM_NOTAGS, 'Home city of the user', VALUE_OPTIONAL),
 805                     'url'         => new external_value(PARAM_URL, 'URL of the user', VALUE_OPTIONAL),
 806                     'country'     => new external_value(PARAM_ALPHA, 'Home country code of the user, such as AU or CZ', VALUE_OPTIONAL),
 807                     'profileimageurlsmall' => new external_value(PARAM_URL, 'User image profile URL - small version', VALUE_OPTIONAL),
 808                     'profileimageurl' => new external_value(PARAM_URL, 'User image profile URL - big version', VALUE_OPTIONAL),
 809                     'customfields' => new external_multiple_structure(
 810                         new external_single_structure(
 811                             array(
 812                                 'type'  => new external_value(PARAM_ALPHANUMEXT, 'The type of the custom field - text field, checkbox...'),
 813                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 814                                 'name' => new external_value(PARAM_RAW, 'The name of the custom field'),
 815                                 'shortname' => new external_value(PARAM_RAW, 'The shortname of the custom field - to be able to build the field class in the code'),
 816                             )
 817                         ), 'User custom fields (also known as user profil fields)', VALUE_OPTIONAL),
 818                     'groups' => new external_multiple_structure(
 819                         new external_single_structure(
 820                             array(
 821                                 'id'  => new external_value(PARAM_INT, 'group id'),
 822                                 'name' => new external_value(PARAM_RAW, 'group name'),
 823                                 'description' => new external_value(PARAM_RAW, 'group description'),
 824                                 'descriptionformat' => new external_format_value('description'),
 825                             )
 826                         ), 'user groups', VALUE_OPTIONAL),
 827                     'roles' => new external_multiple_structure(
 828                         new external_single_structure(
 829                             array(
 830                                 'roleid'       => new external_value(PARAM_INT, 'role id'),
 831                                 'name'         => new external_value(PARAM_RAW, 'role name'),
 832                                 'shortname'    => new external_value(PARAM_ALPHANUMEXT, 'role shortname'),
 833                                 'sortorder'    => new external_value(PARAM_INT, 'role sortorder')
 834                             )
 835                         ), 'user roles', VALUE_OPTIONAL),
 836                     'preferences' => new external_multiple_structure(
 837                         new external_single_structure(
 838                             array(
 839                                 'name'  => new external_value(PARAM_RAW, 'The name of the preferences'),
 840                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 841                             )
 842                     ), 'User preferences', VALUE_OPTIONAL),
 843                     'enrolledcourses' => new external_multiple_structure(
 844                         new external_single_structure(
 845                             array(
 846                                 'id'  => new external_value(PARAM_INT, 'Id of the course'),
 847                                 'fullname' => new external_value(PARAM_RAW, 'Fullname of the course'),
 848                                 'shortname' => new external_value(PARAM_RAW, 'Shortname of the course')
 849                             )
 850                     ), 'Courses where the user is enrolled - limited by which courses the user is able to see', VALUE_OPTIONAL)
 851                 )
 852             )
 853         );
 854     }
 855
 856     /**
 857      * Returns description of get_course_enrolment_methods() parameters
 858      *
 859      * @return external_function_parameters
 860      */
 861     public static function get_course_enrolment_methods_parameters() {
 862         return new external_function_parameters(
 863             array(
 864                 'courseid' => new external_value(PARAM_INT, 'Course id')
 865             )
 866         );
 867     }
 868
 869     /**
 870      * Get list of active course enrolment methods for current user.
 871      *
 872      * @param int $courseid
 873      * @return array of course enrolment methods
 874      * @throws moodle_exception
 875      */
 876     public static function get_course_enrolment_methods($courseid) {
 877         global $DB;
 878
 879         $params = self::validate_parameters(self::get_course_enrolment_methods_parameters(), array('courseid' => $courseid));
 880         self::validate_context(context_system::instance());
 881
 882         $course = $DB->get_record('course', array('id' => $params['courseid']), '*', MUST_EXIST);
 883         if (!core_course_category::can_view_course_info($course) && !can_access_course($course)) {
 884             throw new moodle_exception('coursehidden');
 885         }
 886
 887         $result = array();
 888         $enrolinstances = enrol_get_instances($params['courseid'], true);
 889         foreach ($enrolinstances as $enrolinstance) {
 890             if ($enrolplugin = enrol_get_plugin($enrolinstance->enrol)) {
 891                 if ($instanceinfo = $enrolplugin->get_enrol_info($enrolinstance)) {
 892                     $result[] = (array) $instanceinfo;
 893                 }
 894             }
 895         }
 896         return $result;
 897     }
 898
 899     /**
 900      * Returns description of get_course_enrolment_methods() result value
 901      *
 902      * @return external_description
 903      */
 904     public static function get_course_enrolment_methods_returns() {
 905         return new external_multiple_structure(
 906             new external_single_structure(
 907                 array(
 908                     'id' => new external_value(PARAM_INT, 'id of course enrolment instance'),
 909                     'courseid' => new external_value(PARAM_INT, 'id of course'),
 910                     'type' => new external_value(PARAM_PLUGIN, 'type of enrolment plugin'),
 911                     'name' => new external_value(PARAM_RAW, 'name of enrolment plugin'),
 912                     'status' => new external_value(PARAM_RAW, 'status of enrolment plugin'),
 913                     'wsfunction' => new external_value(PARAM_ALPHANUMEXT, 'webservice function to get more information', VALUE_OPTIONAL),
 914                 )
 915             )
 916         );
 917     }
 918
 919     /**
 920      * Returns description of edit_user_enrolment() parameters
 921      *
 922      * @return external_function_parameters
 923      */
 924     public static function edit_user_enrolment_parameters() {
 925         return new external_function_parameters(
 926             array(
 927                 'courseid' => new external_value(PARAM_INT, 'User enrolment ID'),
 928                 'ueid' => new external_value(PARAM_INT, 'User enrolment ID'),
 929                 'status' => new external_value(PARAM_INT, 'Enrolment status'),
 930                 'timestart' => new external_value(PARAM_INT, 'Enrolment start timestamp', VALUE_DEFAULT, 0),
 931                 'timeend' => new external_value(PARAM_INT, 'Enrolment end timestamp', VALUE_DEFAULT, 0),
 932             )
 933         );
 934     }
 935
 936     /**
 937      * External function that updates a given user enrolment.
 938      *
 939      * @param int $courseid The course ID.
 940      * @param int $ueid The user enrolment ID.
 941      * @param int $status The enrolment status.
 942      * @param int $timestart Enrolment start timestamp.
 943      * @param int $timeend Enrolment end timestamp.
 944      * @return array An array consisting of the processing result, errors and form output, if available.
 945      */
 946     public static function edit_user_enrolment($courseid, $ueid, $status, $timestart = 0, $timeend = 0) {
 947         global $CFG, $DB, $PAGE;
 948
 949         $params = self::validate_parameters(self::edit_user_enrolment_parameters(), [
 950             'courseid' => $courseid,
 951             'ueid' => $ueid,
 952             'status' => $status,
 953             'timestart' => $timestart,
 954             'timeend' => $timeend,
 955         ]);
 956
 957         $course = get_course($courseid);
 958         $context = context_course::instance($course->id);
 959         self::validate_context($context);
 960
 961         $userenrolment = $DB->get_record('user_enrolments', ['id' => $params['ueid']], '*', MUST_EXIST);
 962         $userenroldata = [
 963             'status' => $params['status'],
 964             'timestart' => $params['timestart'],
 965             'timeend' => $params['timeend'],
 966         ];
 967
 968         $result = false;
 969         $errors = [];
 970
 971         // Validate data against the edit user enrolment form.
 972         $instance = $DB->get_record('enrol', ['id' => $userenrolment->enrolid], '*', MUST_EXIST);
 973         $plugin = enrol_get_plugin($instance->enrol);
 974         require_once("$CFG->dirroot/enrol/editenrolment_form.php");
 975         $customformdata = [
 976             'ue' => $userenrolment,
 977             'modal' => true,
 978             'enrolinstancename' => $plugin->get_instance_name($instance)
 979         ];
 980         $mform = new \enrol_user_enrolment_form(null, $customformdata, 'post', '', null, true, $userenroldata);
 981         $mform->set_data($userenroldata);
 982         $validationerrors = $mform->validation($userenroldata, null);
 983         if (empty($validationerrors)) {
 984             require_once($CFG->dirroot . '/enrol/locallib.php');
 985             $manager = new course_enrolment_manager($PAGE, $course);
 986             $result = $manager->edit_enrolment($userenrolment, (object)$userenroldata);
 987         } else {
 988             foreach ($validationerrors as $key => $errormessage) {
 989                 $errors[] = (object)[
 990                     'key' => $key,
 991                     'message' => $errormessage
 992                 ];
 993             }
 994         }
 995
 996         return [
 997             'result' => $result,
 998             'errors' => $errors,
 999         ];
1000     }
1001
1002     /**
1003      * Returns description of edit_user_enrolment() result value
1004      *
1005      * @return external_description
1006      */
1007     public static function edit_user_enrolment_returns() {
1008         return new external_single_structure(
1009             array(
1010                 'result' => new external_value(PARAM_BOOL, 'True if the user\'s enrolment was successfully updated'),
1011                 'errors' => new external_multiple_structure(
1012                     new external_single_structure(
1013                         array(
1014                             'key' => new external_value(PARAM_TEXT, 'The data that failed the validation'),
1015                             'message' => new external_value(PARAM_TEXT, 'The error message'),
1016                         )
1017                     ), 'List of validation errors'
1018                 ),
1019             )
1020         );
1021     }
1022
1023     /**
1024      * Returns description of unenrol_user_enrolment() parameters
1025      *
1026      * @return external_function_parameters
1027      */
1028     public static function unenrol_user_enrolment_parameters() {
1029         return new external_function_parameters(
1030             array(
1031                 'ueid' => new external_value(PARAM_INT, 'User enrolment ID')
1032             )
1033         );
1034     }
1035
1036     /**
1037      * External function that unenrols a given user enrolment.
1038      *
1039      * @param int $ueid The user enrolment ID.
1040      * @return array An array consisting of the processing result, errors.
1041      */
1042     public static function unenrol_user_enrolment($ueid) {
1043         global $CFG, $DB, $PAGE;
1044
1045         $params = self::validate_parameters(self::unenrol_user_enrolment_parameters(), [
1046             'ueid' => $ueid
1047         ]);
1048
1049         $result = false;
1050         $errors = [];
1051
1052         $userenrolment = $DB->get_record('user_enrolments', ['id' => $params['ueid']], '*');
1053         if ($userenrolment) {
1054             $userid = $userenrolment->userid;
1055             $enrolid = $userenrolment->enrolid;
1056             $enrol = $DB->get_record('enrol', ['id' => $enrolid], '*', MUST_EXIST);
1057             $courseid = $enrol->courseid;
1058             $course = get_course($courseid);
1059             $context = context_course::instance($course->id);
1060             self::validate_context($context);
1061         } else {
1062             $validationerrors['invalidrequest'] = get_string('invalidrequest', 'enrol');
1063         }
1064
1065         // If the userenrolment exists, unenrol the user.
1066         if (!isset($validationerrors)) {
1067             require_once($CFG->dirroot . '/enrol/locallib.php');
1068             $manager = new course_enrolment_manager($PAGE, $course);
1069             $result = $manager->unenrol_user($userenrolment);
1070         } else {
1071             foreach ($validationerrors as $key => $errormessage) {
1072                 $errors[] = (object)[
1073                     'key' => $key,
1074                     'message' => $errormessage
1075                 ];
1076             }
1077         }
1078
1079         return [
1080             'result' => $result,
1081             'errors' => $errors,
1082         ];
1083     }
1084
1085     /**
1086      * Returns description of unenrol_user_enrolment() result value
1087      *
1088      * @return external_description
1089      */
1090     public static function unenrol_user_enrolment_returns() {
1091         return new external_single_structure(
1092             array(
1093                 'result' => new external_value(PARAM_BOOL, 'True if the user\'s enrolment was successfully updated'),
1094                 'errors' => new external_multiple_structure(
1095                     new external_single_structure(
1096                         array(
1097                             'key' => new external_value(PARAM_TEXT, 'The data that failed the validation'),
1098                             'message' => new external_value(PARAM_TEXT, 'The error message'),
1099                         )
1100                     ), 'List of validation errors'
1101                 ),
1102             )
1103         );
1104     }
1105 }
1106
1107 /**
1108  * Role external functions
1109  *
1110  * @package    core_role
1111  * @category   external
1112  * @copyright  2011 Jerome Mouneyrac
1113  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1114  * @since Moodle 2.2
1115  */
1116 class core_role_external extends external_api {
1117
1118     /**
1119      * Returns description of method parameters
1120      *
1121      * @return external_function_parameters
1122      */
1123     public static function assign_roles_parameters() {
1124         return new external_function_parameters(
1125             array(
1126                 'assignments' => new external_multiple_structure(
1127                     new external_single_structure(
1128                         array(
1129                             'roleid'    => new external_value(PARAM_INT, 'Role to assign to the user'),
1130                             'userid'    => new external_value(PARAM_INT, 'The user that is going to be assigned'),
1131                             'contextid' => new external_value(PARAM_INT, 'The context to assign the user role in', VALUE_OPTIONAL),
1132                             'contextlevel' => new external_value(PARAM_ALPHA, 'The context level to assign the user role in
1133                                     (block, course, coursecat, system, user, module)', VALUE_OPTIONAL),
1134                             'instanceid' => new external_value(PARAM_INT, 'The Instance id of item where the role needs to be assigned', VALUE_OPTIONAL),
1135                         )
1136                     )
1137                 )
1138             )
1139         );
1140     }
1141
1142     /**
1143      * Manual role assignments to users
1144      *
1145      * @param array $assignments An array of manual role assignment
1146      */
1147     public static function assign_roles($assignments) {
1148         global $DB;
1149
1150         // Do basic automatic PARAM checks on incoming data, using params description
1151         // If any problems are found then exceptions are thrown with helpful error messages
1152         $params = self::validate_parameters(self::assign_roles_parameters(), array('assignments'=>$assignments));
1153
1154         $transaction = $DB->start_delegated_transaction();
1155
1156         foreach ($params['assignments'] as $assignment) {
1157             // Ensure correct context level with a instance id or contextid is passed.
1158             $context = self::get_context_from_params($assignment);
1159
1160             // Ensure the current user is allowed to run this function in the enrolment context.
1161             self::validate_context($context);
1162             require_capability('moodle/role:assign', $context);
1163
1164             // throw an exception if user is not able to assign the role in this context
1165             $roles = get_assignable_roles($context, ROLENAME_SHORT);
1166
1167             if (!array_key_exists($assignment['roleid'], $roles)) {
1168                 throw new invalid_parameter_exception('Can not assign roleid='.$assignment['roleid'].' in contextid='.$assignment['contextid']);
1169             }
1170
1171             role_assign($assignment['roleid'], $assignment['userid'], $context->id);
1172         }
1173
1174         $transaction->allow_commit();
1175     }
1176
1177     /**
1178      * Returns description of method result value
1179      *
1180      * @return null
1181      */
1182     public static function assign_roles_returns() {
1183         return null;
1184     }
1185
1186
1187     /**
1188      * Returns description of method parameters
1189      *
1190      * @return external_function_parameters
1191      */
1192     public static function unassign_roles_parameters() {
1193         return new external_function_parameters(
1194             array(
1195                 'unassignments' => new external_multiple_structure(
1196                     new external_single_structure(
1197                         array(
1198                             'roleid'    => new external_value(PARAM_INT, 'Role to assign to the user'),
1199                             'userid'    => new external_value(PARAM_INT, 'The user that is going to be assigned'),
1200                             'contextid' => new external_value(PARAM_INT, 'The context to unassign the user role from', VALUE_OPTIONAL),
1201                             'contextlevel' => new external_value(PARAM_ALPHA, 'The context level to unassign the user role in
1202 +                                    (block, course, coursecat, system, user, module)', VALUE_OPTIONAL),
1203                             'instanceid' => new external_value(PARAM_INT, 'The Instance id of item where the role needs to be unassigned', VALUE_OPTIONAL),
1204                         )
1205                     )
1206                 )
1207             )
1208         );
1209     }
1210
1211      /**
1212      * Unassign roles from users
1213      *
1214      * @param array $unassignments An array of unassignment
1215      */
1216     public static function unassign_roles($unassignments) {
1217          global $DB;
1218
1219         // Do basic automatic PARAM checks on incoming data, using params description
1220         // If any problems are found then exceptions are thrown with helpful error messages
1221         $params = self::validate_parameters(self::unassign_roles_parameters(), array('unassignments'=>$unassignments));
1222
1223         $transaction = $DB->start_delegated_transaction();
1224
1225         foreach ($params['unassignments'] as $unassignment) {
1226             // Ensure the current user is allowed to run this function in the unassignment context
1227             $context = self::get_context_from_params($unassignment);
1228             self::validate_context($context);
1229             require_capability('moodle/role:assign', $context);
1230
1231             // throw an exception if user is not able to unassign the role in this context
1232             $roles = get_assignable_roles($context, ROLENAME_SHORT);
1233             if (!array_key_exists($unassignment['roleid'], $roles)) {
1234                 throw new invalid_parameter_exception('Can not unassign roleid='.$unassignment['roleid'].' in contextid='.$unassignment['contextid']);
1235             }
1236
1237             role_unassign($unassignment['roleid'], $unassignment['userid'], $context->id);
1238         }
1239
1240         $transaction->allow_commit();
1241     }
1242
1243    /**
1244      * Returns description of method result value
1245      *
1246      * @return null
1247      */
1248     public static function unassign_roles_returns() {
1249         return null;
1250     }
1251 }