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See Release Notes

  • Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
  • Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?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/>.

/**
 * Represent the url for each method and the encoding of the parameters and response.
 *
 * @package    core_badges
 * @copyright  2012 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @author     Yuliya Bozhko <yuliya.bozhko@totaralms.com>
 */

namespace core_badges;

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

global $CFG;
require_once($CFG->libdir . '/filelib.php');

use context_system;
use core_badges\external\assertion_exporter;
use core_badges\external\collection_exporter;
use core_badges\external\issuer_exporter;
use core_badges\external\badgeclass_exporter;
use curl;

/**
 * Represent a single method for the remote api.
 *
 * @package    core_badges
 * @copyright  2012 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class backpack_api_mapping {

    /** @var string The action of this method. */
    public $action;

    /** @var string The base url of this backpack. */
    private $url;

    /** @var array List of parameters for this method. */
    public $params;

    /** @var string Name of a class to export parameters for this method. */
    public $requestexporter;

    /** @var string Name of a class to export response for this method. */
    public $responseexporter;

    /** @var boolean This method returns an array of responses. */
    public $multiple;

    /** @var string get or post methods. */
    public $method;

    /** @var boolean json decode the response. */
    public $json;

    /** @var boolean Authentication is required for this request. */
    public $authrequired;

    /** @var boolean Differentiate the function that can be called on a user backpack or a site backpack. */
    private $isuserbackpack;

    /** @var string Error string from authentication request. */
    private static $authenticationerror = '';

    /**
     * Create a mapping.
     *
     * @param string $action The action of this method.
     * @param string $url The base url of this backpack.
     * @param mixed $postparams List of parameters for this method.
     * @param string $requestexporter Name of a class to export parameters for this method.
     * @param string $responseexporter Name of a class to export response for this method.
     * @param boolean $multiple This method returns an array of responses.
     * @param string $method get or post methods.
     * @param boolean $json json decode the response.
     * @param boolean $authrequired Authentication is required for this request.
     * @param boolean $isuserbackpack user backpack or a site backpack.
     * @param integer $backpackapiversion OpenBadges version 1 or 2.
     */
    public function __construct($action, $url, $postparams, $requestexporter, $responseexporter,
                                $multiple, $method, $json, $authrequired, $isuserbackpack, $backpackapiversion) {
        $this->action = $action;
        $this->url = $url;
        $this->postparams = $postparams;
        $this->requestexporter = $requestexporter;
        $this->responseexporter = $responseexporter;
        $this->multiple = $multiple;
        $this->method = $method;
        $this->json = $json;
        $this->authrequired = $authrequired;
        $this->isuserbackpack = $isuserbackpack;
        $this->backpackapiversion = $backpackapiversion;
    }

    /**
     * Get the unique key for the token.
     *
     * @param string $type The type of token.
     * @return string
     */
    private function get_token_key($type) {
        $prefix = 'badges_';
        if ($this->isuserbackpack) {
            $prefix .= 'user_backpack_';
        } else {
            $prefix .= 'site_backpack_';
        }
        $prefix .= $type . '_token';
        return $prefix;
    }

    /**
     * Remember the error message in a static variable.
     *
     * @param string $msg The message.
     */
    public static function set_authentication_error($msg) {
        self::$authenticationerror = $msg;
    }

    /**
     * Get the last authentication error in this request.
     *
     * @return string
     */
    public static function get_authentication_error() {
        return self::$authenticationerror;
    }

    /**
     * Does the action match this mapping?
     *
     * @param string $action The action.
     * @return boolean
     */
    public function is_match($action) {
        return $this->action == $action;
    }

    /**
     * Parse the method url and insert parameters.
     *
     * @param string $apiurl The raw apiurl.
     * @param string $param1 The first parameter.
     * @param string $param2 The second parameter.
     * @return string
     */
    private function get_url($apiurl, $param1, $param2) {
        $urlscheme = parse_url($apiurl, PHP_URL_SCHEME);
        $urlhost = parse_url($apiurl, PHP_URL_HOST);

        $url = $this->url;
        $url = str_replace('[SCHEME]', $urlscheme, $url);
        $url = str_replace('[HOST]', $urlhost, $url);
        $url = str_replace('[URL]', $apiurl, $url);
        $url = str_replace('[PARAM1]', $param1, $url);
        $url = str_replace('[PARAM2]', $param2, $url);

        return $url;
    }

    /**
     * Parse the post parameters and insert replacements.
     *
     * @param string $email The api username.
     * @param string $password The api password.
     * @param string $param The parameter.
     * @return mixed
     */
    private function get_post_params($email, $password, $param) {
        global $PAGE;

        if ($this->method == 'get') {
            return '';
        }

        $request = $this->postparams;
        if ($request === '[PARAM]') {
            $value = $param;
            foreach ($value as $key => $keyvalue) {
                if (gettype($value[$key]) == 'array') {
                    $newkey = 'related_' . $key;
                    $value[$newkey] = $value[$key];
                    unset($value[$key]);
                }
            }
        } else if (is_array($request)) {
            foreach ($request as $key => $value) {
                if ($value == '[EMAIL]') {
                    $value = $email;
                    $request[$key] = $value;
                } else if ($value == '[PASSWORD]') {
                    $value = $password;
                    $request[$key] = $value;
> } else if ($value == '[PARAM]') { } > $request[$key] = is_array($param) ? $param[0] : $param;
} } $context = context_system::instance(); $exporter = $this->requestexporter; $output = $PAGE->get_renderer('core', 'badges'); if (!empty($exporter)) { $exporterinstance = new $exporter($value, ['context' => $context]); $request = $exporterinstance->export($output); } if ($this->json) { return json_encode($request); } return $request; } /** * Read the response from a V1 user request and save the userID. * * @param string $response The request response. * @param integer $backpackid The backpack id. * @return mixed */ private function convert_email_response($response, $backpackid) { global $SESSION; if (isset($response->status) && $response->status == 'okay') { // Remember the tokens. $useridkey = $this->get_token_key(BADGE_USER_ID_TOKEN); $backpackidkey = $this->get_token_key(BADGE_BACKPACK_ID_TOKEN); $SESSION->$useridkey = $response->userId; $SESSION->$backpackidkey = $backpackid; return $response->userId; } if (!empty($response->error)) { self::set_authentication_error($response->error); } return false; } /** * Get the user id from a previous user request. * * @return integer */ private function get_auth_user_id() { global $USER; if ($this->isuserbackpack) { return $USER->id; } else { // The access tokens for the system backpack are shared. return -1; } } /** * Parse the response from an openbadges 2 login. * * @param string $response The request response data. * @param integer $backpackid The id of the backpack. * @return mixed */ private function oauth_token_response($response, $backpackid) { global $SESSION; if (isset($response->access_token) && isset($response->refresh_token)) { // Remember the tokens. $accesskey = $this->get_token_key(BADGE_ACCESS_TOKEN); $refreshkey = $this->get_token_key(BADGE_REFRESH_TOKEN); $expireskey = $this->get_token_key(BADGE_EXPIRES_TOKEN); $useridkey = $this->get_token_key(BADGE_USER_ID_TOKEN); $backpackidkey = $this->get_token_key(BADGE_BACKPACK_ID_TOKEN); if (isset($response->expires_in)) { $timeout = $response->expires_in; } else { $timeout = 15 * 60; // 15 minute timeout if none set. } $expires = $timeout + time(); $SESSION->$expireskey = $expires; $SESSION->$useridkey = $this->get_auth_user_id(); $SESSION->$accesskey = $response->access_token; $SESSION->$refreshkey = $response->refresh_token; $SESSION->$backpackidkey = $backpackid; return -1; } else if (isset($response->error_description)) { self::set_authentication_error($response->error_description); } return $response; } /** * Standard options used for all curl requests. * * @return array */ private function get_curl_options() { return array( 'FRESH_CONNECT' => true, 'RETURNTRANSFER' => true,
> 'FOLLOWLOCATION' => true,
'FORBID_REUSE' => true, 'HEADER' => 0, 'CONNECTTIMEOUT' => 3, 'CONNECTTIMEOUT' => 3, // Follow redirects with the same type of request when sent 301, or 302 redirects. 'CURLOPT_POSTREDIR' => 3, ); } /** * Make an api request and parse the response. * * @param string $apiurl Raw request url. * @param string $urlparam1 Parameter for the request. * @param string $urlparam2 Parameter for the request. * @param string $email User email for authentication. * @param string $password for authentication. * @param mixed $postparam Raw data for the post body. * @param string $backpackid the id of the backpack to use. * @return mixed */ public function request($apiurl, $urlparam1, $urlparam2, $email, $password, $postparam, $backpackid) { global $SESSION, $PAGE; $curl = new curl(); $url = $this->get_url($apiurl, $urlparam1, $urlparam2); if ($this->authrequired) { $accesskey = $this->get_token_key(BADGE_ACCESS_TOKEN); if (isset($SESSION->$accesskey)) { $token = $SESSION->$accesskey; $curl->setHeader('Authorization: Bearer ' . $token); } } if ($this->json) { $curl->setHeader(array('Content-type: application/json')); } $curl->setHeader(array('Accept: application/json', 'Expect:')); $options = $this->get_curl_options(); $post = $this->get_post_params($email, $password, $postparam); if ($this->method == 'get') { $response = $curl->get($url, $post, $options); } else if ($this->method == 'post') { $response = $curl->post($url, $post, $options);
> } else if ($this->method == 'put') { } > $response = $curl->put($url, $post, $options);
$response = json_decode($response); if (isset($response->result)) { $response = $response->result; } $context = context_system::instance(); $exporter = $this->responseexporter; if (class_exists($exporter)) { $output = $PAGE->get_renderer('core', 'badges'); if (!$this->multiple) { if (count($response)) { $response = $response[0]; } if (empty($response)) { return null; } $apidata = $exporter::map_external_data($response, $this->backpackapiversion); $exporterinstance = new $exporter($apidata, ['context' => $context]); $data = $exporterinstance->export($output); return $data; } else { $multiple = []; if (empty($response)) { return $multiple; } foreach ($response as $data) { $apidata = $exporter::map_external_data($data, $this->backpackapiversion); $exporterinstance = new $exporter($apidata, ['context' => $context]); $multiple[] = $exporterinstance->export($output); } return $multiple; } } else if (method_exists($this, $exporter)) { return $this->$exporter($response, $backpackid); } return $response; } }