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, $DB;
  89         require_once($CFG->dirroot . "/user/lib.php");
  90
  91         if (empty($coursecapabilities)) {
  92             throw new invalid_parameter_exception('Parameter can not be empty');
  93         }
  94         $params = self::validate_parameters(self::get_enrolled_users_with_capability_parameters(),
  95             array ('coursecapabilities' => $coursecapabilities,  'options'=>$options));
  96         $result = array();
  97         $userlist = array();
  98         $groupid        = 0;
  99         $onlyactive     = false;
 100         $userfields     = array();
 101         $limitfrom = 0;
 102         $limitnumber = 0;
 103         foreach ($params['options'] as $option) {
 104             switch ($option['name']) {
 105                 case 'groupid':
 106                     $groupid = (int)$option['value'];
 107                     break;
 108                 case 'onlyactive':
 109                     $onlyactive = !empty($option['value']);
 110                     break;
 111                 case 'userfields':
 112                     $thefields = explode(',', $option['value']);
 113                     foreach ($thefields as $f) {
 114                         $userfields[] = clean_param($f, PARAM_ALPHANUMEXT);
 115                     }
 116                     break;
 117                 case 'limitfrom' :
 118                     $limitfrom = clean_param($option['value'], PARAM_INT);
 119                     break;
 120                 case 'limitnumber' :
 121                     $limitnumber = clean_param($option['value'], PARAM_INT);
 122                     break;
 123             }
 124         }
 125
 126         foreach ($params['coursecapabilities'] as $coursecapability) {
 127             $courseid = $coursecapability['courseid'];
 128             $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
 129             $coursecontext = context_course::instance($courseid);
 130             if (!$coursecontext) {
 131                 throw new moodle_exception('cannotfindcourse', 'error', '', null,
 132                         'The course id ' . $courseid . ' doesn\'t exist.');
 133             }
 134             if ($courseid == SITEID) {
 135                 $context = context_system::instance();
 136             } else {
 137                 $context = $coursecontext;
 138             }
 139             try {
 140                 self::validate_context($context);
 141             } catch (Exception $e) {
 142                 $exceptionparam = new stdClass();
 143                 $exceptionparam->message = $e->getMessage();
 144                 $exceptionparam->courseid = $params['courseid'];
 145                 throw new moodle_exception(get_string('errorcoursecontextnotvalid' , 'webservice', $exceptionparam));
 146             }
 147
 148             if ($courseid == SITEID) {
 149                 require_capability('moodle/site:viewparticipants', $context);
 150             } else {
 151                 require_capability('moodle/course:viewparticipants', $context);
 152             }
 153             // The accessallgroups capability is needed to use this option.
 154             if (!empty($groupid) && groups_is_member($groupid)) {
 155                 require_capability('moodle/site:accessallgroups', $coursecontext);
 156             }
 157             // The course:enrolereview capability is needed to use this option.
 158             if ($onlyactive) {
 159                 require_capability('moodle/course:enrolreview', $coursecontext);
 160             }
 161
 162             // To see the permissions of others role:review capability is required.
 163             require_capability('moodle/role:review', $coursecontext);
 164             foreach ($coursecapability['capabilities'] as $capability) {
 165                 $courseusers['courseid'] = $courseid;
 166                 $courseusers['capability'] = $capability;
 167
 168                 list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext, $capability, $groupid, $onlyactive);
 169
 170                 $sql = "SELECT u.* FROM {user} u WHERE u.id IN ($enrolledsql) ORDER BY u.id ASC";
 171
 172                 $enrolledusers = $DB->get_recordset_sql($sql, $enrolledparams, $limitfrom, $limitnumber);
 173                 $users = array();
 174                 foreach ($enrolledusers as $courseuser) {
 175                     if ($userdetails = user_get_user_details($courseuser, $course, $userfields)) {
 176                         $users[] = $userdetails;
 177                     }
 178                 }
 179                 $enrolledusers->close();
 180                 $courseusers['users'] = $users;
 181                 $result[] = $courseusers;
 182             }
 183         }
 184         return $result;
 185     }
 186
 187     /**
 188      * Returns description of method result value
 189      *
 190      * @return external_multiple_structure
 191      * @since Moodle 2.4
 192      */
 193     public static function get_enrolled_users_with_capability_returns() {
 194         return  new external_multiple_structure( new external_single_structure (
 195                 array (
 196                     'courseid' => new external_value(PARAM_INT, 'Course ID number in the Moodle course table'),
 197                     'capability' => new external_value(PARAM_CAPABILITY, 'Capability name'),
 198                     'users' => new external_multiple_structure(
 199                         new external_single_structure(
 200                 array(
 201                     'id'    => new external_value(PARAM_INT, 'ID of the user'),
 202                     'username'    => new external_value(PARAM_RAW, 'Username', VALUE_OPTIONAL),
 203                     'firstname'   => new external_value(PARAM_NOTAGS, 'The first name(s) of the user', VALUE_OPTIONAL),
 204                     'lastname'    => new external_value(PARAM_NOTAGS, 'The family name of the user', VALUE_OPTIONAL),
 205                     'fullname'    => new external_value(PARAM_NOTAGS, 'The fullname of the user'),
 206                     'email'       => new external_value(PARAM_TEXT, 'Email address', VALUE_OPTIONAL),
 207                     'address'     => new external_value(PARAM_MULTILANG, 'Postal address', VALUE_OPTIONAL),
 208                     'phone1'      => new external_value(PARAM_NOTAGS, 'Phone 1', VALUE_OPTIONAL),
 209                     'phone2'      => new external_value(PARAM_NOTAGS, 'Phone 2', VALUE_OPTIONAL),
 210                     'icq'         => new external_value(PARAM_NOTAGS, 'icq number', VALUE_OPTIONAL),
 211                     'skype'       => new external_value(PARAM_NOTAGS, 'skype id', VALUE_OPTIONAL),
 212                     'yahoo'       => new external_value(PARAM_NOTAGS, 'yahoo id', VALUE_OPTIONAL),
 213                     'aim'         => new external_value(PARAM_NOTAGS, 'aim id', VALUE_OPTIONAL),
 214                     'msn'         => new external_value(PARAM_NOTAGS, 'msn number', VALUE_OPTIONAL),
 215                     'department'  => new external_value(PARAM_TEXT, 'department', VALUE_OPTIONAL),
 216                     'institution' => new external_value(PARAM_TEXT, 'institution', VALUE_OPTIONAL),
 217                     'interests'   => new external_value(PARAM_TEXT, 'user interests (separated by commas)', VALUE_OPTIONAL),
 218                     'firstaccess' => new external_value(PARAM_INT, 'first access to the site (0 if never)', VALUE_OPTIONAL),
 219                     'lastaccess'  => new external_value(PARAM_INT, 'last access to the site (0 if never)', VALUE_OPTIONAL),
 220                     'description' => new external_value(PARAM_RAW, 'User profile description', VALUE_OPTIONAL),
 221                     'descriptionformat' => new external_value(PARAM_INT, 'User profile description format', VALUE_OPTIONAL),
 222                     'city'        => new external_value(PARAM_NOTAGS, 'Home city of the user', VALUE_OPTIONAL),
 223                     'url'         => new external_value(PARAM_URL, 'URL of the user', VALUE_OPTIONAL),
 224                     'country'     => new external_value(PARAM_ALPHA, 'Country code of the user, such as AU or CZ', VALUE_OPTIONAL),
 225                     'profileimageurlsmall' => new external_value(PARAM_URL, 'User image profile URL - small', VALUE_OPTIONAL),
 226                     'profileimageurl' => new external_value(PARAM_URL, 'User image profile URL - big', VALUE_OPTIONAL),
 227                     'customfields' => new external_multiple_structure(
 228                         new external_single_structure(
 229                             array(
 230                                 'type'  => new external_value(PARAM_ALPHANUMEXT, 'The type of the custom field'),
 231                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 232                                 'name' => new external_value(PARAM_RAW, 'The name of the custom field'),
 233                                 'shortname' => new external_value(PARAM_RAW, 'The shortname of the custom field'),
 234                             )
 235                         ), 'User custom fields (also known as user profil fields)', VALUE_OPTIONAL),
 236                     'groups' => new external_multiple_structure(
 237                         new external_single_structure(
 238                             array(
 239                                 'id'  => new external_value(PARAM_INT, 'group id'),
 240                                 'name' => new external_value(PARAM_RAW, 'group name'),
 241                                 'description' => new external_value(PARAM_RAW, 'group description'),
 242                             )
 243                         ), 'user groups', VALUE_OPTIONAL),
 244                     'roles' => new external_multiple_structure(
 245                         new external_single_structure(
 246                             array(
 247                                 'roleid'       => new external_value(PARAM_INT, 'role id'),
 248                                 'name'         => new external_value(PARAM_RAW, 'role name'),
 249                                 'shortname'    => new external_value(PARAM_ALPHANUMEXT, 'role shortname'),
 250                                 'sortorder'    => new external_value(PARAM_INT, 'role sortorder')
 251                             )
 252                         ), 'user roles', VALUE_OPTIONAL),
 253                     'preferences' => new external_multiple_structure(
 254                         new external_single_structure(
 255                             array(
 256                                 'name'  => new external_value(PARAM_ALPHANUMEXT, 'The name of the preferences'),
 257                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 258                             )
 259                     ), 'User preferences', VALUE_OPTIONAL),
 260                     'enrolledcourses' => new external_multiple_structure(
 261                         new external_single_structure(
 262                             array(
 263                                 'id'  => new external_value(PARAM_INT, 'Id of the course'),
 264                                 'fullname' => new external_value(PARAM_RAW, 'Fullname of the course'),
 265                                 'shortname' => new external_value(PARAM_RAW, 'Shortname of the course')
 266                             )
 267                     ), 'Courses where the user is enrolled - limited by which courses the user is able to see', VALUE_OPTIONAL)
 268                 )
 269                         ), 'List of users that are enrolled in the course and have the specified capability'),
 270                     )
 271                 )
 272             );
 273     }
 274
 275     /**
 276      * Returns description of method parameters
 277      *
 278      * @return external_function_parameters
 279      */
 280     public static function get_users_courses_parameters() {
 281         return new external_function_parameters(
 282             array(
 283                 'userid' => new external_value(PARAM_INT, 'user id'),
 284             )
 285         );
 286     }
 287
 288     /**
 289      * Get list of courses user is enrolled in (only active enrolments are returned).
 290      * Please note the current user must be able to access the course, otherwise the course is not included.
 291      *
 292      * @param int $userid
 293      * @return array of courses
 294      */
 295     public static function get_users_courses($userid) {
 296         global $USER, $DB;
 297
 298         // Do basic automatic PARAM checks on incoming data, using params description
 299         // If any problems are found then exceptions are thrown with helpful error messages
 300         $params = self::validate_parameters(self::get_users_courses_parameters(), array('userid'=>$userid));
 301
 302         $courses = enrol_get_users_courses($params['userid'], true, 'id, shortname, fullname, idnumber, visible,
 303                    summary, summaryformat, format, showgrades, lang, enablecompletion, category, startdate, enddate');
 304         $result = array();
 305
 306         foreach ($courses as $course) {
 307             $context = context_course::instance($course->id, IGNORE_MISSING);
 308             try {
 309                 self::validate_context($context);
 310             } catch (Exception $e) {
 311                 // current user can not access this course, sorry we can not disclose who is enrolled in this course!
 312                 continue;
 313             }
 314
 315             if ($userid != $USER->id and !has_capability('moodle/course:viewparticipants', $context)) {
 316                 // we need capability to view participants
 317                 continue;
 318             }
 319
 320             list($enrolledsqlselect, $enrolledparams) = get_enrolled_sql($context);
 321             $enrolledsql = "SELECT COUNT('x') FROM ($enrolledsqlselect) enrolleduserids";
 322             $enrolledusercount = $DB->count_records_sql($enrolledsql, $enrolledparams);
 323
 324             list($course->summary, $course->summaryformat) =
 325                 external_format_text($course->summary, $course->summaryformat, $context->id, 'course', 'summary', null);
 326             $course->fullname = external_format_string($course->fullname, $context->id);
 327             $course->shortname = external_format_string($course->shortname, $context->id);
 328
 329             $progress = null;
 330             if ($course->enablecompletion) {
 331                 $progress = \core_completion\progress::get_course_progress_percentage($course);
 332             }
 333
 334             $result[] = array(
 335                 'id' => $course->id,
 336                 'shortname' => $course->shortname,
 337                 'fullname' => $course->fullname,
 338                 'idnumber' => $course->idnumber,
 339                 'visible' => $course->visible,
 340                 'enrolledusercount' => $enrolledusercount,
 341                 'summary' => $course->summary,
 342                 'summaryformat' => $course->summaryformat,
 343                 'format' => $course->format,
 344                 'showgrades' => $course->showgrades,
 345                 'lang' => $course->lang,
 346                 'enablecompletion' => $course->enablecompletion,
 347                 'category' => $course->category,
 348                 'progress' => $progress,
 349                 'startdate' => $course->startdate,
 350                 'enddate' => $course->enddate,
 351             );
 352         }
 353
 354         return $result;
 355     }
 356
 357     /**
 358      * Returns description of method result value
 359      *
 360      * @return external_description
 361      */
 362     public static function get_users_courses_returns() {
 363         return new external_multiple_structure(
 364             new external_single_structure(
 365                 array(
 366                     'id'        => new external_value(PARAM_INT, 'id of course'),
 367                     'shortname' => new external_value(PARAM_RAW, 'short name of course'),
 368                     'fullname'  => new external_value(PARAM_RAW, 'long name of course'),
 369                     'enrolledusercount' => new external_value(PARAM_INT, 'Number of enrolled users in this course'),
 370                     'idnumber'  => new external_value(PARAM_RAW, 'id number of course'),
 371                     'visible'   => new external_value(PARAM_INT, '1 means visible, 0 means hidden course'),
 372                     'summary'   => new external_value(PARAM_RAW, 'summary', VALUE_OPTIONAL),
 373                     'summaryformat' => new external_format_value('summary', VALUE_OPTIONAL),
 374                     'format'    => new external_value(PARAM_PLUGIN, 'course format: weeks, topics, social, site', VALUE_OPTIONAL),
 375                     'showgrades' => new external_value(PARAM_BOOL, 'true if grades are shown, otherwise false', VALUE_OPTIONAL),
 376                     'lang'      => new external_value(PARAM_LANG, 'forced course language', VALUE_OPTIONAL),
 377                     'enablecompletion' => new external_value(PARAM_BOOL, 'true if completion is enabled, otherwise false',
 378                                                                 VALUE_OPTIONAL),
 379                     'category' => new external_value(PARAM_INT, 'course category id', VALUE_OPTIONAL),
 380                     'progress' => new external_value(PARAM_FLOAT, 'Progress percentage', VALUE_OPTIONAL),
 381                     'startdate' => new external_value(PARAM_INT, 'Timestamp when the course start', VALUE_OPTIONAL),
 382                     'enddate' => new external_value(PARAM_INT, 'Timestamp when the course end', VALUE_OPTIONAL),
 383                 )
 384             )
 385         );
 386     }
 387
 388     /**
 389      * Returns description of method parameters value
 390      *
 391      * @return external_description
 392      */
 393     public static function get_potential_users_parameters() {
 394         return new external_function_parameters(
 395             array(
 396                 'courseid' => new external_value(PARAM_INT, 'course id'),
 397                 'enrolid' => new external_value(PARAM_INT, 'enrolment id'),
 398                 'search' => new external_value(PARAM_RAW, 'query'),
 399                 'searchanywhere' => new external_value(PARAM_BOOL, 'find a match anywhere, or only at the beginning'),
 400                 'page' => new external_value(PARAM_INT, 'Page number'),
 401                 'perpage' => new external_value(PARAM_INT, 'Number per page'),
 402             )
 403         );
 404     }
 405
 406     /**
 407      * Get potential users.
 408      *
 409      * @param int $courseid Course id
 410      * @param int $enrolid Enrolment id
 411      * @param string $search The query
 412      * @param boolean $searchanywhere Match anywhere in the string
 413      * @param int $page Page number
 414      * @param int $perpage Max per page
 415      * @return array An array of users
 416      */
 417     public static function get_potential_users($courseid, $enrolid, $search, $searchanywhere, $page, $perpage) {
 418         global $PAGE, $DB, $CFG;
 419
 420         require_once($CFG->dirroot.'/enrol/locallib.php');
 421         require_once($CFG->dirroot.'/user/lib.php');
 422
 423         $params = self::validate_parameters(
 424             self::get_potential_users_parameters(),
 425             array(
 426                 'courseid' => $courseid,
 427                 'enrolid' => $enrolid,
 428                 'search' => $search,
 429                 'searchanywhere' => $searchanywhere,
 430                 'page' => $page,
 431                 'perpage' => $perpage
 432             )
 433         );
 434         $context = context_course::instance($params['courseid']);
 435         try {
 436             self::validate_context($context);
 437         } catch (Exception $e) {
 438             $exceptionparam = new stdClass();
 439             $exceptionparam->message = $e->getMessage();
 440             $exceptionparam->courseid = $params['courseid'];
 441             throw new moodle_exception('errorcoursecontextnotvalid' , 'webservice', '', $exceptionparam);
 442         }
 443         require_capability('moodle/course:enrolreview', $context);
 444
 445         $course = $DB->get_record('course', array('id' => $params['courseid']));
 446         $manager = new course_enrolment_manager($PAGE, $course);
 447
 448         $users = $manager->get_potential_users($params['enrolid'],
 449                                                $params['search'],
 450                                                $params['searchanywhere'],
 451                                                $params['page'],
 452                                                $params['perpage']);
 453
 454         $results = array();
 455         $requiredfields = ['id', 'fullname', 'profileimageurl', 'profileimageurlsmall'];
 456         foreach ($users['users'] as $id => $user) {
 457             // Note: We pass the course here to validate that the current user can at least view user details in this course.
 458             // The user we are looking at is not in this course yet though - but we only fetch the minimal set of
 459             // user records, and the user has been validated to have course:enrolreview in this course. Otherwise
 460             // there is no way to find users who aren't in the course in order to enrol them.
 461             if ($userdetails = user_get_user_details($user, $course, $requiredfields)) {
 462                 $results[] = $userdetails;
 463             }
 464         }
 465         return $results;
 466     }
 467
 468     /**
 469      * Returns description of method result value
 470      *
 471      * @return external_description
 472      */
 473     public static function get_potential_users_returns() {
 474         global $CFG;
 475         require_once($CFG->dirroot . '/user/externallib.php');
 476         return new external_multiple_structure(core_user_external::user_description());
 477     }
 478
 479     /**
 480      * Returns description of method parameters
 481      *
 482      * @return external_function_parameters
 483      */
 484     public static function get_enrolled_users_parameters() {
 485         return new external_function_parameters(
 486             array(
 487                 'courseid' => new external_value(PARAM_INT, 'course id'),
 488                 'options'  => new external_multiple_structure(
 489                     new external_single_structure(
 490                         array(
 491                             'name'  => new external_value(PARAM_ALPHANUMEXT, 'option name'),
 492                             'value' => new external_value(PARAM_RAW, 'option value')
 493                         )
 494                     ), 'Option names:
 495                             * withcapability (string) return only users with this capability. This option requires \'moodle/role:review\' on the course context.
 496                             * groupid (integer) return only users in this group id. If the course has groups enabled and this param
 497                                                 isn\'t defined, returns all the viewable users.
 498                                                 This option requires \'moodle/site:accessallgroups\' on the course context if the
 499                                                 user doesn\'t belong to the group.
 500                             * onlyactive (integer) return only users with active enrolments and matching time restrictions. This option requires \'moodle/course:enrolreview\' on the course context.
 501                             * userfields (\'string, string, ...\') return only the values of these user fields.
 502                             * limitfrom (integer) sql limit from.
 503                             * limitnumber (integer) maximum number of returned users.
 504                             * sortby (string) sort by id, firstname or lastname. For ordering like the site does, use siteorder.
 505                             * sortdirection (string) ASC or DESC',
 506                             VALUE_DEFAULT, array()),
 507             )
 508         );
 509     }
 510
 511     /**
 512      * Get course participants details
 513      *
 514      * @param int $courseid  course id
 515      * @param array $options options {
 516      *                                'name' => option name
 517      *                                'value' => option value
 518      *                               }
 519      * @return array An array of users
 520      */
 521     public static function get_enrolled_users($courseid, $options = array()) {
 522         global $CFG, $USER, $DB;
 523         require_once($CFG->dirroot . "/user/lib.php");
 524
 525         $params = self::validate_parameters(
 526             self::get_enrolled_users_parameters(),
 527             array(
 528                 'courseid'=>$courseid,
 529                 'options'=>$options
 530             )
 531         );
 532         $withcapability = '';
 533         $groupid        = 0;
 534         $onlyactive     = false;
 535         $userfields     = array();
 536         $limitfrom = 0;
 537         $limitnumber = 0;
 538         $sortby = 'us.id';
 539         $sortparams = array();
 540         $sortdirection = 'ASC';
 541         foreach ($options as $option) {
 542             switch ($option['name']) {
 543             case 'withcapability':
 544                 $withcapability = $option['value'];
 545                 break;
 546             case 'groupid':
 547                 $groupid = (int)$option['value'];
 548                 break;
 549             case 'onlyactive':
 550                 $onlyactive = !empty($option['value']);
 551                 break;
 552             case 'userfields':
 553                 $thefields = explode(',', $option['value']);
 554                 foreach ($thefields as $f) {
 555                     $userfields[] = clean_param($f, PARAM_ALPHANUMEXT);
 556                 }
 557                 break;
 558             case 'limitfrom' :
 559                 $limitfrom = clean_param($option['value'], PARAM_INT);
 560                 break;
 561             case 'limitnumber' :
 562                 $limitnumber = clean_param($option['value'], PARAM_INT);
 563                 break;
 564             case 'sortby':
 565                 $sortallowedvalues = array('id', 'firstname', 'lastname', 'siteorder');
 566                 if (!in_array($option['value'], $sortallowedvalues)) {
 567                     throw new invalid_parameter_exception('Invalid value for sortby parameter (value: ' . $option['value'] . '),' .
 568                         'allowed values are: ' . implode(',', $sortallowedvalues));
 569                 }
 570                 if ($option['value'] == 'siteorder') {
 571                     list($sortby, $sortparams) = users_order_by_sql('us');
 572                 } else {
 573                     $sortby = 'us.' . $option['value'];
 574                 }
 575                 break;
 576             case 'sortdirection':
 577                 $sortdirection = strtoupper($option['value']);
 578                 $directionallowedvalues = array('ASC', 'DESC');
 579                 if (!in_array($sortdirection, $directionallowedvalues)) {
 580                     throw new invalid_parameter_exception('Invalid value for sortdirection parameter
 581                         (value: ' . $sortdirection . '),' . 'allowed values are: ' . implode(',', $directionallowedvalues));
 582                 }
 583                 break;
 584             }
 585         }
 586
 587         $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
 588         $coursecontext = context_course::instance($courseid, IGNORE_MISSING);
 589         if ($courseid == SITEID) {
 590             $context = context_system::instance();
 591         } else {
 592             $context = $coursecontext;
 593         }
 594         try {
 595             self::validate_context($context);
 596         } catch (Exception $e) {
 597             $exceptionparam = new stdClass();
 598             $exceptionparam->message = $e->getMessage();
 599             $exceptionparam->courseid = $params['courseid'];
 600             throw new moodle_exception('errorcoursecontextnotvalid' , 'webservice', '', $exceptionparam);
 601         }
 602
 603         if ($courseid == SITEID) {
 604             require_capability('moodle/site:viewparticipants', $context);
 605         } else {
 606             require_capability('moodle/course:viewparticipants', $context);
 607         }
 608         // to overwrite this parameter, you need role:review capability
 609         if ($withcapability) {
 610             require_capability('moodle/role:review', $coursecontext);
 611         }
 612         // need accessallgroups capability if you want to overwrite this option
 613         if (!empty($groupid) && !groups_is_member($groupid)) {
 614             require_capability('moodle/site:accessallgroups', $coursecontext);
 615         }
 616         // to overwrite this option, you need course:enrolereview permission
 617         if ($onlyactive) {
 618             require_capability('moodle/course:enrolreview', $coursecontext);
 619         }
 620
 621         list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext, $withcapability, $groupid, $onlyactive);
 622         $ctxselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
 623         $ctxjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = u.id AND ctx.contextlevel = :contextlevel)";
 624         $enrolledparams['contextlevel'] = CONTEXT_USER;
 625
 626         $groupjoin = '';
 627         if (empty($groupid) && groups_get_course_groupmode($course) == SEPARATEGROUPS &&
 628                 !has_capability('moodle/site:accessallgroups', $coursecontext)) {
 629             // Filter by groups the user can view.
 630             $usergroups = groups_get_user_groups($course->id);
 631             if (!empty($usergroups['0'])) {
 632                 list($groupsql, $groupparams) = $DB->get_in_or_equal($usergroups['0'], SQL_PARAMS_NAMED);
 633                 $groupjoin = "JOIN {groups_members} gm ON (u.id = gm.userid AND gm.groupid $groupsql)";
 634                 $enrolledparams = array_merge($enrolledparams, $groupparams);
 635             } else {
 636                 // User doesn't belong to any group, so he can't see any user. Return an empty array.
 637                 return array();
 638             }
 639         }
 640         $sql = "SELECT us.*
 641                   FROM {user} us
 642                   JOIN (
 643                       SELECT DISTINCT u.id $ctxselect
 644                         FROM {user} u $ctxjoin $groupjoin
 645                        WHERE u.id IN ($enrolledsql)
 646                   ) q ON q.id = us.id
 647                 ORDER BY $sortby $sortdirection";
 648         $enrolledparams = array_merge($enrolledparams, $sortparams);
 649         $enrolledusers = $DB->get_recordset_sql($sql, $enrolledparams, $limitfrom, $limitnumber);
 650         $users = array();
 651         foreach ($enrolledusers as $user) {
 652             context_helper::preload_from_record($user);
 653             if ($userdetails = user_get_user_details($user, $course, $userfields)) {
 654                 $users[] = $userdetails;
 655             }
 656         }
 657         $enrolledusers->close();
 658
 659         return $users;
 660     }
 661
 662     /**
 663      * Returns description of method result value
 664      *
 665      * @return external_description
 666      */
 667     public static function get_enrolled_users_returns() {
 668         return new external_multiple_structure(
 669             new external_single_structure(
 670                 array(
 671                     'id'    => new external_value(PARAM_INT, 'ID of the user'),
 672                     'username'    => new external_value(PARAM_RAW, 'Username policy is defined in Moodle security config', VALUE_OPTIONAL),
 673                     'firstname'   => new external_value(PARAM_NOTAGS, 'The first name(s) of the user', VALUE_OPTIONAL),
 674                     'lastname'    => new external_value(PARAM_NOTAGS, 'The family name of the user', VALUE_OPTIONAL),
 675                     'fullname'    => new external_value(PARAM_NOTAGS, 'The fullname of the user'),
 676                     'email'       => new external_value(PARAM_TEXT, 'An email address - allow email as root@localhost', VALUE_OPTIONAL),
 677                     'address'     => new external_value(PARAM_TEXT, 'Postal address', VALUE_OPTIONAL),
 678                     'phone1'      => new external_value(PARAM_NOTAGS, 'Phone 1', VALUE_OPTIONAL),
 679                     'phone2'      => new external_value(PARAM_NOTAGS, 'Phone 2', VALUE_OPTIONAL),
 680                     'icq'         => new external_value(PARAM_NOTAGS, 'icq number', VALUE_OPTIONAL),
 681                     'skype'       => new external_value(PARAM_NOTAGS, 'skype id', VALUE_OPTIONAL),
 682                     'yahoo'       => new external_value(PARAM_NOTAGS, 'yahoo id', VALUE_OPTIONAL),
 683                     'aim'         => new external_value(PARAM_NOTAGS, 'aim id', VALUE_OPTIONAL),
 684                     'msn'         => new external_value(PARAM_NOTAGS, 'msn number', VALUE_OPTIONAL),
 685                     'department'  => new external_value(PARAM_TEXT, 'department', VALUE_OPTIONAL),
 686                     'institution' => new external_value(PARAM_TEXT, 'institution', VALUE_OPTIONAL),
 687                     'idnumber'    => new external_value(PARAM_RAW, 'An arbitrary ID code number perhaps from the institution', VALUE_OPTIONAL),
 688                     'interests'   => new external_value(PARAM_TEXT, 'user interests (separated by commas)', VALUE_OPTIONAL),
 689                     'firstaccess' => new external_value(PARAM_INT, 'first access to the site (0 if never)', VALUE_OPTIONAL),
 690                     'lastaccess'  => new external_value(PARAM_INT, 'last access to the site (0 if never)', VALUE_OPTIONAL),
 691                     'description' => new external_value(PARAM_RAW, 'User profile description', VALUE_OPTIONAL),
 692                     'descriptionformat' => new external_format_value('description', VALUE_OPTIONAL),
 693                     'city'        => new external_value(PARAM_NOTAGS, 'Home city of the user', VALUE_OPTIONAL),
 694                     'url'         => new external_value(PARAM_URL, 'URL of the user', VALUE_OPTIONAL),
 695                     'country'     => new external_value(PARAM_ALPHA, 'Home country code of the user, such as AU or CZ', VALUE_OPTIONAL),
 696                     'profileimageurlsmall' => new external_value(PARAM_URL, 'User image profile URL - small version', VALUE_OPTIONAL),
 697                     'profileimageurl' => new external_value(PARAM_URL, 'User image profile URL - big version', VALUE_OPTIONAL),
 698                     'customfields' => new external_multiple_structure(
 699                         new external_single_structure(
 700                             array(
 701                                 'type'  => new external_value(PARAM_ALPHANUMEXT, 'The type of the custom field - text field, checkbox...'),
 702                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 703                                 'name' => new external_value(PARAM_RAW, 'The name of the custom field'),
 704                                 'shortname' => new external_value(PARAM_RAW, 'The shortname of the custom field - to be able to build the field class in the code'),
 705                             )
 706                         ), 'User custom fields (also known as user profil fields)', VALUE_OPTIONAL),
 707                     'groups' => new external_multiple_structure(
 708                         new external_single_structure(
 709                             array(
 710                                 'id'  => new external_value(PARAM_INT, 'group id'),
 711                                 'name' => new external_value(PARAM_RAW, 'group name'),
 712                                 'description' => new external_value(PARAM_RAW, 'group description'),
 713                                 'descriptionformat' => new external_format_value('description'),
 714                             )
 715                         ), 'user groups', VALUE_OPTIONAL),
 716                     'roles' => new external_multiple_structure(
 717                         new external_single_structure(
 718                             array(
 719                                 'roleid'       => new external_value(PARAM_INT, 'role id'),
 720                                 'name'         => new external_value(PARAM_RAW, 'role name'),
 721                                 'shortname'    => new external_value(PARAM_ALPHANUMEXT, 'role shortname'),
 722                                 'sortorder'    => new external_value(PARAM_INT, 'role sortorder')
 723                             )
 724                         ), 'user roles', VALUE_OPTIONAL),
 725                     'preferences' => new external_multiple_structure(
 726                         new external_single_structure(
 727                             array(
 728                                 'name'  => new external_value(PARAM_ALPHANUMEXT, 'The name of the preferences'),
 729                                 'value' => new external_value(PARAM_RAW, 'The value of the custom field'),
 730                             )
 731                     ), 'User preferences', VALUE_OPTIONAL),
 732                     'enrolledcourses' => new external_multiple_structure(
 733                         new external_single_structure(
 734                             array(
 735                                 'id'  => new external_value(PARAM_INT, 'Id of the course'),
 736                                 'fullname' => new external_value(PARAM_RAW, 'Fullname of the course'),
 737                                 'shortname' => new external_value(PARAM_RAW, 'Shortname of the course')
 738                             )
 739                     ), 'Courses where the user is enrolled - limited by which courses the user is able to see', VALUE_OPTIONAL)
 740                 )
 741             )
 742         );
 743     }
 744
 745     /**
 746      * Returns description of get_course_enrolment_methods() parameters
 747      *
 748      * @return external_function_parameters
 749      */
 750     public static function get_course_enrolment_methods_parameters() {
 751         return new external_function_parameters(
 752             array(
 753                 'courseid' => new external_value(PARAM_INT, 'Course id')
 754             )
 755         );
 756     }
 757
 758     /**
 759      * Get list of active course enrolment methods for current user.
 760      *
 761      * @param int $courseid
 762      * @return array of course enrolment methods
 763      * @throws moodle_exception
 764      */
 765     public static function get_course_enrolment_methods($courseid) {
 766         global $DB;
 767
 768         $params = self::validate_parameters(self::get_course_enrolment_methods_parameters(), array('courseid' => $courseid));
 769         self::validate_context(context_system::instance());
 770
 771         $course = $DB->get_record('course', array('id' => $params['courseid']), '*', MUST_EXIST);
 772         $context = context_course::instance($course->id);
 773         if (!$course->visible and !has_capability('moodle/course:viewhiddencourses', $context)) {
 774             throw new moodle_exception('coursehidden');
 775         }
 776
 777         $result = array();
 778         $enrolinstances = enrol_get_instances($params['courseid'], true);
 779         foreach ($enrolinstances as $enrolinstance) {
 780             if ($enrolplugin = enrol_get_plugin($enrolinstance->enrol)) {
 781                 if ($instanceinfo = $enrolplugin->get_enrol_info($enrolinstance)) {
 782                     $result[] = (array) $instanceinfo;
 783                 }
 784             }
 785         }
 786         return $result;
 787     }
 788
 789     /**
 790      * Returns description of get_course_enrolment_methods() result value
 791      *
 792      * @return external_description
 793      */
 794     public static function get_course_enrolment_methods_returns() {
 795         return new external_multiple_structure(
 796             new external_single_structure(
 797                 array(
 798                     'id' => new external_value(PARAM_INT, 'id of course enrolment instance'),
 799                     'courseid' => new external_value(PARAM_INT, 'id of course'),
 800                     'type' => new external_value(PARAM_PLUGIN, 'type of enrolment plugin'),
 801                     'name' => new external_value(PARAM_RAW, 'name of enrolment plugin'),
 802                     'status' => new external_value(PARAM_RAW, 'status of enrolment plugin'),
 803                     'wsfunction' => new external_value(PARAM_ALPHANUMEXT, 'webservice function to get more information', VALUE_OPTIONAL),
 804                 )
 805             )
 806         );
 807     }
 808 }
 809
 810 /**
 811  * Role external functions
 812  *
 813  * @package    core_role
 814  * @category   external
 815  * @copyright  2011 Jerome Mouneyrac
 816  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 817  * @since Moodle 2.2
 818  */
 819 class core_role_external extends external_api {
 820
 821     /**
 822      * Returns description of method parameters
 823      *
 824      * @return external_function_parameters
 825      */
 826     public static function assign_roles_parameters() {
 827         return new external_function_parameters(
 828             array(
 829                 'assignments' => new external_multiple_structure(
 830                     new external_single_structure(
 831                         array(
 832                             'roleid'    => new external_value(PARAM_INT, 'Role to assign to the user'),
 833                             'userid'    => new external_value(PARAM_INT, 'The user that is going to be assigned'),
 834                             'contextid' => new external_value(PARAM_INT, 'The context to assign the user role in', VALUE_OPTIONAL),
 835                             'contextlevel' => new external_value(PARAM_ALPHA, 'The context level to assign the user role in
 836                                     (block, course, coursecat, system, user, module)', VALUE_OPTIONAL),
 837                             'instanceid' => new external_value(PARAM_INT, 'The Instance id of item where the role needs to be assigned', VALUE_OPTIONAL),
 838                         )
 839                     )
 840                 )
 841             )
 842         );
 843     }
 844
 845     /**
 846      * Manual role assignments to users
 847      *
 848      * @param array $assignments An array of manual role assignment
 849      */
 850     public static function assign_roles($assignments) {
 851         global $DB;
 852
 853         // Do basic automatic PARAM checks on incoming data, using params description
 854         // If any problems are found then exceptions are thrown with helpful error messages
 855         $params = self::validate_parameters(self::assign_roles_parameters(), array('assignments'=>$assignments));
 856
 857         $transaction = $DB->start_delegated_transaction();
 858
 859         foreach ($params['assignments'] as $assignment) {
 860             // Ensure correct context level with a instance id or contextid is passed.
 861             $context = self::get_context_from_params($assignment);
 862
 863             // Ensure the current user is allowed to run this function in the enrolment context.
 864             self::validate_context($context);
 865             require_capability('moodle/role:assign', $context);
 866
 867             // throw an exception if user is not able to assign the role in this context
 868             $roles = get_assignable_roles($context, ROLENAME_SHORT);
 869
 870             if (!array_key_exists($assignment['roleid'], $roles)) {
 871                 throw new invalid_parameter_exception('Can not assign roleid='.$assignment['roleid'].' in contextid='.$assignment['contextid']);
 872             }
 873
 874             role_assign($assignment['roleid'], $assignment['userid'], $context->id);
 875         }
 876
 877         $transaction->allow_commit();
 878     }
 879
 880     /**
 881      * Returns description of method result value
 882      *
 883      * @return null
 884      */
 885     public static function assign_roles_returns() {
 886         return null;
 887     }
 888
 889
 890     /**
 891      * Returns description of method parameters
 892      *
 893      * @return external_function_parameters
 894      */
 895     public static function unassign_roles_parameters() {
 896         return new external_function_parameters(
 897             array(
 898                 'unassignments' => new external_multiple_structure(
 899                     new external_single_structure(
 900                         array(
 901                             'roleid'    => new external_value(PARAM_INT, 'Role to assign to the user'),
 902                             'userid'    => new external_value(PARAM_INT, 'The user that is going to be assigned'),
 903                             'contextid' => new external_value(PARAM_INT, 'The context to unassign the user role from', VALUE_OPTIONAL),
 904                             'contextlevel' => new external_value(PARAM_ALPHA, 'The context level to unassign the user role in
 905 +                                    (block, course, coursecat, system, user, module)', VALUE_OPTIONAL),
 906                             'instanceid' => new external_value(PARAM_INT, 'The Instance id of item where the role needs to be unassigned', VALUE_OPTIONAL),
 907                         )
 908                     )
 909                 )
 910             )
 911         );
 912     }
 913
 914      /**
 915      * Unassign roles from users
 916      *
 917      * @param array $unassignments An array of unassignment
 918      */
 919     public static function unassign_roles($unassignments) {
 920          global $DB;
 921
 922         // Do basic automatic PARAM checks on incoming data, using params description
 923         // If any problems are found then exceptions are thrown with helpful error messages
 924         $params = self::validate_parameters(self::unassign_roles_parameters(), array('unassignments'=>$unassignments));
 925
 926         $transaction = $DB->start_delegated_transaction();
 927
 928         foreach ($params['unassignments'] as $unassignment) {
 929             // Ensure the current user is allowed to run this function in the unassignment context
 930             $context = self::get_context_from_params($unassignment);
 931             self::validate_context($context);
 932             require_capability('moodle/role:assign', $context);
 933
 934             // throw an exception if user is not able to unassign the role in this context
 935             $roles = get_assignable_roles($context, ROLENAME_SHORT);
 936             if (!array_key_exists($unassignment['roleid'], $roles)) {
 937                 throw new invalid_parameter_exception('Can not unassign roleid='.$unassignment['roleid'].' in contextid='.$unassignment['contextid']);
 938             }
 939
 940             role_unassign($unassignment['roleid'], $unassignment['userid'], $context->id);
 941         }
 942
 943         $transaction->allow_commit();
 944     }
 945
 946    /**
 947      * Returns description of method result value
 948      *
 949      * @return null
 950      */
 951     public static function unassign_roles_returns() {
 952         return null;
 953     }
 954 }