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320 lines
13 KiB
320 lines
13 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This file contains a class definition for the LineItem container resource
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*
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* @package ltiservice_gradebookservices
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* @copyright 2017 Cengage Learning http://www.cengage.com
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* @author Dirk Singels, Diego del Blanco, Claude Vervoort
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace ltiservice_gradebookservices\local\resources;
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use ltiservice_gradebookservices\local\service\gradebookservices;
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use mod_lti\local\ltiservice\resource_base;
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defined('MOODLE_INTERNAL') || die();
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/**
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* A resource implementing LineItem container.
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*
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* @package ltiservice_gradebookservices
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* @copyright 2017 Cengage Learning http://www.cengage.com
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class lineitems extends resource_base {
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/**
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* Class constructor.
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*
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* @param \ltiservice_gradebookservices\local\service\gradebookservices $service Service instance
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*/
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public function __construct($service) {
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parent::__construct($service);
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$this->id = 'LineItem.collection';
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$this->template = '/{context_id}/lineitems';
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$this->variables[] = 'LineItems.url';
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$this->formats[] = 'application/vnd.ims.lis.v2.lineitemcontainer+json';
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$this->formats[] = 'application/vnd.ims.lis.v2.lineitem+json';
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$this->methods[] = self::HTTP_GET;
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$this->methods[] = self::HTTP_POST;
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}
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/**
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* Execute the request for this resource.
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*
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* @param \mod_lti\local\ltiservice\response $response Response object for this request.
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*/
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public function execute($response) {
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global $DB;
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$params = $this->parse_template();
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$contextid = $params['context_id'];
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$isget = $response->get_request_method() === self::HTTP_GET;
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if ($isget) {
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$contenttype = $response->get_accept();
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} else {
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$contenttype = $response->get_content_type();
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}
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$container = empty($contenttype) || ($contenttype === $this->formats[0]);
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// We will receive typeid when working with LTI 1.x, if not then we are in LTI 2.
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$typeid = optional_param('type_id', null, PARAM_INT);
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$scopes = array(gradebookservices::SCOPE_GRADEBOOKSERVICES_LINEITEM);
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if ($response->get_request_method() === self::HTTP_GET) {
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$scopes[] = gradebookservices::SCOPE_GRADEBOOKSERVICES_LINEITEM_READ;
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}
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try {
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if (!$this->check_tool($typeid, $response->get_request_data(), $scopes)) {
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throw new \Exception(null, 401);
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}
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$typeid = $this->get_service()->get_type()->id;
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if (empty($contextid) || !($container ^ ($response->get_request_method() === self::HTTP_POST)) ||
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(!empty($contenttype) && !in_array($contenttype, $this->formats))) {
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throw new \Exception('No context or unsupported content type', 400);
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}
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if (!($course = $DB->get_record('course', array('id' => $contextid), 'id', IGNORE_MISSING))) {
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throw new \Exception("Not Found: Course {$contextid} doesn't exist", 404);
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}
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if (!$this->get_service()->is_allowed_in_context($typeid, $course->id)) {
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throw new \Exception('Not allowed in context', 403);
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}
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if ($response->get_request_method() !== self::HTTP_POST) {
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$resourceid = optional_param('resource_id', null, PARAM_TEXT);
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$ltilinkid = optional_param('resource_link_id', null, PARAM_TEXT);
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if (is_null($ltilinkid)) {
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$ltilinkid = optional_param('lti_link_id', null, PARAM_TEXT);
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}
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$tag = optional_param('tag', null, PARAM_TEXT);
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$limitnum = optional_param('limit', 0, PARAM_INT);
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$limitfrom = optional_param('from', 0, PARAM_INT);
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$itemsandcount = $this->get_service()->get_lineitems($contextid, $resourceid, $ltilinkid, $tag, $limitfrom,
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$limitnum, $typeid);
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$items = $itemsandcount[1];
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$totalcount = $itemsandcount[0];
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$json = $this->get_json_for_get_request($items, $resourceid, $ltilinkid, $tag, $limitfrom,
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$limitnum, $totalcount, $typeid, $response);
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$response->set_content_type($this->formats[0]);
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} else {
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$json = $this->get_json_for_post_request($response->get_request_data(), $contextid, $typeid);
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$response->set_code(201);
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$response->set_content_type($this->formats[1]);
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}
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$response->set_body($json);
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} catch (\Exception $e) {
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$response->set_code($e->getCode());
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$response->set_reason($e->getMessage());
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}
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}
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/**
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* Generate the JSON for a GET request.
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*
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* @param array $items Array of lineitems
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* @param string $resourceid Resource identifier used for filtering, may be null
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* @param string $ltilinkid Resource Link identifier used for filtering, may be null
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* @param string $tag Tag identifier used for filtering, may be null
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* @param int $limitfrom Offset of the first line item to return
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* @param int $limitnum Maximum number of line items to return, ignored if zero or less
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* @param int $totalcount Number of total lineitems before filtering for paging
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* @param int $typeid Maximum number of line items to return, ignored if zero or less
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* @param \mod_lti\local\ltiservice\response $response
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* @return string
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*/
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private function get_json_for_get_request($items, $resourceid, $ltilinkid,
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$tag, $limitfrom, $limitnum, $totalcount, $typeid, $response) {
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$firstpage = null;
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$nextpage = null;
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$prevpage = null;
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$lastpage = null;
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if (isset($limitnum) && $limitnum > 0) {
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if ($limitfrom >= $totalcount || $limitfrom < 0) {
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$outofrange = true;
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} else {
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$outofrange = false;
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}
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$limitprev = $limitfrom - $limitnum >= 0 ? $limitfrom - $limitnum : 0;
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$limitcurrent = $limitfrom;
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$limitlast = $totalcount - $limitnum + 1 >= 0 ? $totalcount - $limitnum + 1 : 0;
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$limitfrom += $limitnum;
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$baseurl = new \moodle_url($this->get_endpoint());
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if (isset($resourceid)) {
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$baseurl->param('resource_id', $resourceid);
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}
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if (isset($ltilinkid)) {
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$baseurl->param('resource_link_id', $ltilinkid);
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}
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if (isset($tag)) {
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$baseurl->param('tag', $tag);
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}
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if (is_null($typeid)) {
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$baseurl->param('limit', $limitnum);
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if (($limitfrom <= $totalcount - 1) && (!$outofrange)) {
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$nextpage = new \moodle_url($baseurl, ['from' => $limitfrom]);
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}
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$firstpage = new \moodle_url($baseurl, ['from' => 0]);
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$canonicalpage = new \moodle_url($baseurl, ['from' => $limitcurrent]);
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$lastpage = new \moodle_url($baseurl, ['from' > $limitlast]);
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if (($limitcurrent > 0) && (!$outofrange)) {
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$prevpage = new \moodle_url($baseurl, ['from' => $limitprev]);
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}
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} else {
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$baseurl->params(['type_id' => $typeid, 'limit' => $limitnum]);
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if (($limitfrom <= $totalcount - 1) && (!$outofrange)) {
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$nextpage = new \moodle_url($baseurl, ['from' => $limitfrom]);
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}
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$firstpage = new \moodle_url($baseurl, ['from' => 0]);
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$canonicalpage = new \moodle_url($baseurl, ['from' => $limitcurrent]);
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$lastpage = new \moodle_url($baseurl, ['from' => $limitlast]);
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if (($limitcurrent > 0) && (!$outofrange)) {
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$prevpage = new \moodle_url($baseurl, ['from' => $limitprev]);
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}
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}
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}
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$jsonitems = [];
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$endpoint = parent::get_endpoint();
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foreach ($items as $item) {
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array_push($jsonitems, gradebookservices::item_for_json($item, $endpoint, $typeid));
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}
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if (isset($canonicalpage) && ($canonicalpage)) {
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$links = 'Link: <' . $firstpage->out() . '>; rel=“first”';
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if (!is_null($prevpage)) {
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$links .= ', <' . $prevpage->out() . '>; rel=“prev”';
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}
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$links .= ', <' . $canonicalpage->out(). '>; rel=“canonical”';
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if (!is_null($nextpage)) {
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$links .= ', <' . $nextpage->out() . '>; rel=“next”';
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}
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$links .= ', <' . $lastpage->out() . '>; rel=“last”';
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$response->add_additional_header($links);
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}
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return json_encode($jsonitems);
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}
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/**
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* Generate the JSON for a POST request.
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*
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* @param string $body POST body
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* @param string $contextid Course ID
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* @param string $typeid
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*
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* @return string
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* @throws \Exception
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*/
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private function get_json_for_post_request($body, $contextid, $typeid) {
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global $CFG, $DB;
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$json = json_decode($body);
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if (empty($json) ||
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!isset($json->scoreMaximum) ||
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!isset($json->label)) {
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throw new \Exception('No label or Score Maximum', 400);
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}
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if (is_numeric($json->scoreMaximum)) {
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$max = $json->scoreMaximum;
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} else {
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throw new \Exception(null, 400);
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}
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require_once($CFG->libdir.'/gradelib.php');
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$resourceid = (isset($json->resourceId)) ? $json->resourceId : '';
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$ltilinkid = (isset($json->resourceLinkId)) ? $json->resourceLinkId : null;
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if ($ltilinkid == null) {
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$ltilinkid = (isset($json->ltiLinkId)) ? $json->ltiLinkId : null;
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}
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if ($ltilinkid != null) {
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if (is_null($typeid)) {
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if (!gradebookservices::check_lti_id($ltilinkid, $contextid, $this->get_service()->get_tool_proxy()->id)) {
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throw new \Exception(null, 403);
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}
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} else {
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if (!gradebookservices::check_lti_1x_id($ltilinkid, $contextid, $typeid)) {
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throw new \Exception(null, 403);
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}
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}
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}
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$tag = (isset($json->tag)) ? $json->tag : '';
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if (is_null($typeid)) {
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$toolproxyid = $this->get_service()->get_tool_proxy()->id;
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$baseurl = null;
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} else {
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$toolproxyid = null;
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$baseurl = lti_get_type_type_config($typeid)->lti_toolurl;
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}
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$params = array();
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$params['itemname'] = $json->label;
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$params['gradetype'] = GRADE_TYPE_VALUE;
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$params['grademax'] = $max;
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$params['grademin'] = 0;
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$item = new \grade_item(array('id' => 0, 'courseid' => $contextid));
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\grade_item::set_properties($item, $params);
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$item->itemtype = 'manual';
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$item->idnumber = $resourceid;
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$item->grademax = $max;
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$id = $item->insert('mod/ltiservice_gradebookservices');
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$DB->insert_record('ltiservice_gradebookservices', (object)array(
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'gradeitemid' => $id,
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'courseid' => $contextid,
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'toolproxyid' => $toolproxyid,
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'typeid' => $typeid,
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'baseurl' => $baseurl,
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'ltilinkid' => $ltilinkid,
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'tag' => $tag
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));
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if (is_null($typeid)) {
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$json->id = parent::get_endpoint() . "/{$id}/lineitem";
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} else {
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$json->id = parent::get_endpoint() . "/{$id}/lineitem?type_id={$typeid}";
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}
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return json_encode($json, JSON_UNESCAPED_SLASHES);
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}
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/**
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* Parse a value for custom parameter substitution variables.
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*
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* @param string $value String to be parsed
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*
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* @return string
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*/
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public function parse_value($value) {
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global $COURSE;
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if (strpos($value, '$LineItems.url') !== false) {
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$this->params['context_id'] = $COURSE->id;
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$query = '';
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if (($tool = $this->get_service()->get_type())) {
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$query = "?type_id={$tool->id}";
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}
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$value = str_replace('$LineItems.url', parent::get_endpoint() . $query, $value);
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}
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return $value;
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}
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}
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