Groups.php

<?php
 
namespace ceLTIc\LTI\Service;
 
use ceLTIc\LTI\Context;
use ceLTIc\LTI\User;
 
class Groups extends Service
{
 
    const MEDIA_TYPE_COURSE_GROUP_SETS = 'application/vnd.ims.lti-gs.v1.contextgroupsetcontainer+json';
 
    const MEDIA_TYPE_COURSE_GROUPS = 'application/vnd.ims.lti-gs.v1.contextgroupcontainer+json';
 
    public static $SCOPE = 'https://purl.imsglobal.org/spec/lti-gs/scope/contextgroup.readonly';
 
    public static $defaultLimit = null;
 
    private $context = null;
 
    private $groupsEndpoint = null;
 
    private $groupSetsEndpoint = null;
 
    private $limit;
 
    private $pagingMode;
 
    public function __construct($context, $groupsEndpoint, $groupSetsEndpoint = null, $limit = null, $pagingMode = false)
    {
        $platform = $context->getPlatform();
        parent::__construct($platform, $groupsEndpoint);
        $this->scope = self::$SCOPE;
        $this->mediaType = self::MEDIA_TYPE_COURSE_GROUPS;
        $this->context = $context;
        $this->groupsEndpoint = $groupsEndpoint;
        $this->groupSetsEndpoint = $groupSetsEndpoint;
        $this->limit = $limit;
        $this->pagingMode = $pagingMode;
    }
 
    public function get($allowNonSets = false, $user = null, $limit = null)
    {
        $ok = $this->getGroupSets($limit);
        if ($ok) {
            $ok = $this->getGroups($allowNonSets, $user, $limit);
        }
        if (!$ok) {
            $this->context->groupSets = null;
            $this->context->groups = null;
        }
 
        return $ok;
    }
 
    public function getGroupSets($limit = null)
    {
        $this->endpoint = $this->groupSetsEndpoint;
        $ok = !empty($this->endpoint);
        if ($ok) {
            $this->mediaType = self::MEDIA_TYPE_COURSE_GROUP_SETS;
            $parameters = array();
            if (is_null($limit)) {
                $limit = $this->limit;
            }
            if (is_null($limit)) {
                $limit = self::$defaultLimit;
            }
            if (!empty($limit)) {
                $parameters['limit'] = strval($limit);
            }
            $this->context->groupSets = array();
            $groupSets = array();
            $endpoint = $this->endpoint;
            do {
                $http = $this->send('GET', $parameters);
                $ok = !empty($http) && $http->ok;
                $url = '';
                if ($ok) {
                    if (isset($http->responseJson->sets)) {
                        foreach ($http->responseJson->sets as $set) {
                            $groupSets[$set->id] = array('title' => $set->name, 'groups' => array(),
                                'num_members' => 0, 'num_staff' => 0, 'num_learners' => 0);
                        }
                    }
                    if (!$this->pagingMode && $http->hasRelativeLink('next')) {
                        $url = $http->getRelativeLink('next');
                        $this->endpoint = $url;
                        $parameters = array();
                    }
                }
            } while ($url);
            $this->endpoint = $endpoint;
            if ($ok) {
                $this->context->groupSets = $groupSets;
            }
        }
 
        return $ok;
    }
 
    public function getGroups($allowNonSets = false, $user = null, $limit = null)
    {
        $this->endpoint = $this->groupsEndpoint;
        $ok = !empty($this->endpoint);
        if ($ok) {
            $this->mediaType = self::MEDIA_TYPE_COURSE_GROUPS;
            $parameters = array();
            $ltiUserId = null;
            if (!empty($user) && !empty($user->ltiUserId)) {
                $ltiUserId = $user->ltiUserId;
            }
            if (!empty($ltiUserId)) {
                $parameters['user_id'] = $ltiUserId;
            }
            if (is_null($limit)) {
                $limit = $this->limit;
            }
            if (is_null($limit)) {
                $limit = self::$defaultLimit;
            }
            if (!empty($limit)) {
                $parameters['limit'] = strval($limit);
            }
            if (is_null($this->context->groupSets)) {
                $groupSets = array();
            } else {
                $groupSets = $this->context->groupSets;
            }
            $groups = array();
            $endpoint = $this->endpoint;
            do {
                $http = $this->send('GET', $parameters);
                $ok = !empty($http) && $http->ok;
                $url = '';
                if ($ok) {
                    if (isset($http->responseJson->groups)) {
                        foreach ($http->responseJson->groups as $agroup) {
                            if (!$allowNonSets && empty($agroup->set_id)) {
                                continue;
                            }
                            $group = array('title' => $agroup->name);
                            if (!empty($agroup->set_id)) {
                                if (!array_key_exists($agroup->set_id, $groupSets)) {
                                    $groupSets[$agroup->set_id] = array('title' => "Set {$agroup->set_id}", 'groups' => array(),
                                        'num_members' => 0, 'num_staff' => 0, 'num_learners' => 0);
                                }
                                $groupSets[$agroup->set_id]['groups'][] = $agroup->id;
                                $group['set'] = $agroup->set_id;
                            }
                            if (!empty($agroup->tag)) {
                                $group['tag'] = $agroup->tag;
                            }
                            $groups[$agroup->id] = $group;
                        }
                    }
                    if (!$this->pagingMode && $http->hasRelativeLink('next')) {
                        $url = $http->getRelativeLink('next');
                        $this->endpoint = $url;
                        $parameters = array();
                    }
                }
            } while ($url);
            $this->endpoint = $endpoint;
            if ($ok) {
                $this->context->groupSets = $groupSets;
                if (empty($ltiUserId)) {
                    $this->context->groups = $groups;
                } else {
                    $user->groups = $groups;
                }
            }
        }
 
        return $ok;
    }
 
}