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✏️ Editing: contextsettings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * This file contains a class definition for the Context Settings resource
 *
 * @package    ltiservice_toolsettings
 * @copyright  2014 Vital Source Technologies http://vitalsource.com
 * @author     Stephen Vickers
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace ltiservice_toolsettings\local\resources;

use ltiservice_toolsettings\local\service\toolsettings;

defined('MOODLE_INTERNAL') || die();

/**
 * A resource implementing the Context-level (ToolProxyBinding) Settings.
 *
 * @package    ltiservice_toolsettings
 * @since      Moodle 2.8
 * @copyright  2014 Vital Source Technologies http://vitalsource.com
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class contextsettings extends \mod_lti\local\ltiservice\resource_base {

/**
     * Class constructor.
     *
     * @param \mod_lti\local\ltiservice\service_base $service Service instance
     */
    public function __construct($service) {

parent::__construct($service);
        $this->id = 'ToolProxyBindingSettings';
        $this->template = '/{context_type}/{context_id}/bindings/{vendor_code}/{product_code}(/custom)';
        $this->variables[] = 'ToolProxyBinding.custom.url';
        $this->formats[] = 'application/vnd.ims.lti.v2.toolsettings+json';
        $this->formats[] = 'application/vnd.ims.lti.v2.toolsettings.simple+json';
        $this->methods[] = 'GET';
        $this->methods[] = 'PUT';

}

/**
     * Execute the request for this resource.
     *
     * @param \mod_lti\local\ltiservice\response $response  Response object for this request.
     */
    public function execute($response) {

$params = $this->parse_template();
        $contexttype = $params['context_type'];
        $contextid = $params['context_id'];
        $vendorcode = $params['vendor_code'];
        $productcode = $params['product_code'];
        $bubble = optional_param('bubble', '', PARAM_ALPHA);
        $typeid = null;
        if (($vendorcode === 'tool') && is_numeric($productcode)) {
            $typeid = $productcode;
        }
        $ok = !empty($contexttype) && !empty($contextid) &&
              !empty($vendorcode) && !empty($productcode) &&
              $this->check_tool($typeid, $response->get_request_data(),
                  array(toolsettings::SCOPE_TOOL_SETTINGS));
        if (!$ok) {
            $response->set_code(401);
        } else {
            $toolproxy = $this->get_service()->get_tool_proxy();
            if (!empty($toolproxy)) {
                $ok = $toolproxy->guid === $productcode;
                $typeid = null;
                $id = $toolproxy->id;
            } else {
                $ok = $vendorcode === 'tool';
                $typeid = intval($productcode);
                $id = -$typeid;
            }
            $contenttype = $response->get_accept();
            $simpleformat = !empty($contenttype) && ($contenttype == $this->formats[1]);
            if ($ok) {
                $ok = (empty($bubble) || ((($bubble == 'distinct') || ($bubble == 'all')))) &&
                     (!$simpleformat || empty($bubble) || ($bubble != 'all')) &&
                     (empty($bubble) || ($response->get_request_method() == 'GET'));
            }

if (!$ok) {
                $response->set_code(404);
            } else {
                $systemsetting = null;
                $contextsettings = lti_get_tool_settings($id, $contextid);
                if (!empty($bubble)) {
                    $systemsetting = new systemsettings($this->get_service());
                    $systemsetting->params['tool_proxy_id'] = $productcode;
                    if ($id >= 0) {
                        $systemsetting->params['config_type'] = 'toolproxy';
                    } else {
                        $systemsetting->params['config_type'] = 'tool';
                    }
                    $systemsettings = lti_get_tool_settings($id);
                    if ($bubble == 'distinct') {
                        toolsettings::distinct_settings($systemsettings, $contextsettings, null);
                    }
                } else {
                    $systemsettings = null;
                }
                if ($response->get_request_method() == 'GET') {
                    $json = '';
                    if ($simpleformat) {
                        $response->set_content_type($this->formats[1]);
                        $json .= "{";
                    } else {
                        $response->set_content_type($this->formats[0]);
                        $json .= "{\n  \"@context\":\"http://purl.imsglobal.org/ctx/lti/v2/ToolSettings\",\n  \"@graph\":[\n";
                    }
                    $settings = toolsettings::settings_to_json($systemsettings, $simpleformat, 'ToolProxy', $systemsetting);
                    $json .= $settings;
                    $isfirst = strlen($settings) <= 0;
                    $settings = toolsettings::settings_to_json($contextsettings, $simpleformat, 'ToolProxyBinding', $this);
                    if ((strlen($settings) > 0) && !$isfirst) {
                        $json .= ",";
                    }
                    $json .= $settings;
                    if ($simpleformat) {
                        $json .= "\n}";
                    } else {
                        $json .= "\n  ]\n}";
                    }
                    $response->set_body($json);
                } else { // PUT.
                    $settings = null;
                    if ($response->get_content_type() == $this->formats[0]) {
                        $json = json_decode($response->get_request_data());
                        $ok = !empty($json);
                        if ($ok) {
                            $ok = isset($json->{"@graph"}) && is_array($json->{"@graph"}) && (count($json->{"@graph"}) == 1) &&
                                  ($json->{"@graph"}[0]->{"@type"} == 'ToolProxyBinding');
                        }
                        if ($ok) {
                            $settings = $json->{"@graph"}[0]->custom;
                            unset($settings->{'@id'});
                        }
                    } else {  // Simple JSON.
                        $json = json_decode($response->get_request_data(), true);
                        $ok = !empty($json);
                        if ($ok) {
                            $ok = is_array($json);
                        }
                        if ($ok) {
                            $settings = $json;
                        }
                    }
                    if ($ok) {
                        lti_set_tool_settings($settings, $id, $contextid);
                    } else {
                        $response->set_code(406);
                    }
                }
            }
        }
    }

/**
     * Parse a value for custom parameter substitution variables.
     *
     * @param string $value String to be parsed
     *
     * @return string
     */
    public function parse_value($value) {
        global $COURSE;

if (strpos($value, '$ToolProxyBinding.custom.url') !== false) {
            if ($COURSE->format == 'site') {
                $this->params['context_type'] = 'Group';
            } else {
                $this->params['context_type'] = 'CourseSection';
            }
            $this->params['context_id'] = $COURSE->id;
            if (!empty($this->get_service()->get_tool_proxy())) {
                $this->params['vendor_code'] = $this->get_service()->get_tool_proxy()->vendorcode;
                $this->params['product_code'] = $this->get_service()->get_tool_proxy()->guid;
            } else {
                $this->params['vendor_code'] = 'tool';
                $this->params['product_code'] = $this->get_service()->get_type()->id;
            }
            $value = str_replace('$ToolProxyBinding.custom.url', parent::get_endpoint(), $value);
        }
        return $value;

}

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