admin/tool/mobile/launch.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  * Launch page, launch the app using custom URL schemes.
  19  *
  20  * If the user is not logged when visiting this page, he will be redirected to the login page.
  21  * Once he is logged, he will be redirected again to this page and the app launched via custom URL schemes.
  22  *
  23  * @package    tool_mobile
  24  * @copyright  2016 Juan Leyva
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 require_once(__DIR__ . '/../../../config.php');
  29 require_once($CFG->libdir . '/externallib.php');
  30
  31 $serviceshortname  = required_param('service',  PARAM_ALPHANUMEXT);
  32 $passport          = required_param('passport',  PARAM_RAW);    // Passport send from the app to validate the response URL.
  33 $urlscheme         = optional_param('urlscheme', 'moodlemobile', PARAM_NOTAGS); // The URL scheme the app supports.
  34
  35 // Check web services enabled.
  36 if (!$CFG->enablewebservices) {
  37     throw new moodle_exception('enablewsdescription', 'webservice');
  38 }
  39
  40 // Check if the plugin is properly configured.
  41 $typeoflogin = get_config('tool_mobile', 'typeoflogin');
  42 if ($typeoflogin != tool_mobile\api::LOGIN_VIA_BROWSER and
  43         $typeoflogin != tool_mobile\api::LOGIN_VIA_EMBEDDED_BROWSER) {
  44     throw new moodle_exception('pluginnotenabledorconfigured', 'tool_mobile');
  45 }
  46
  47 // Check if the service exists and is enabled.
  48 $service = $DB->get_record('external_services', array('shortname' => $serviceshortname, 'enabled' => 1));
  49 if (empty($service)) {
  50     throw new moodle_exception('servicenotavailable', 'webservice');
  51 }
  52
  53 require_login(0, false);
  54
  55 // Require an active user: not guest, not suspended.
  56 core_user::require_active_user($USER);
  57
  58 // Get an existing token or create a new one.
  59 $timenow = time();
  60 $token = external_generate_token_for_current_user($service);
  61 $privatetoken = $token->privatetoken;
  62 external_log_token_request($token);
  63
  64 // Don't return the private token if the user didn't just log in and a new token wasn't created.
  65 if (empty($SESSION->justloggedin) and $token->timecreated < $timenow) {
  66     $privatetoken = null;
  67 }
  68
  69 $siteadmin = has_capability('moodle/site:config', context_system::instance(), $USER->id);
  70
  71 // Passport is generated in the mobile app, so the app opening can be validated using that variable.
  72 // Passports are valid only one time, it's deleted in the app once used.
  73 $siteid = md5($CFG->wwwroot . $passport);
  74 $apptoken = $siteid . ':::' . $token->token;
  75 if ($privatetoken and is_https() and !$siteadmin) {
  76     $apptoken .= ':::' . $privatetoken;
  77 }
  78
  79 $apptoken = base64_encode($apptoken);
  80
  81 // Redirect using the custom URL scheme checking first if a URL scheme is forced in the site settings.
  82 $forcedurlscheme = get_config('tool_mobile', 'forcedurlscheme');
  83 if (!empty($forcedurlscheme)) {
  84     $urlscheme = $forcedurlscheme;
  85 }
  86
  87 $location = "$urlscheme://token=$apptoken";
  88
  89 // For iOS 10 onwards, we have to simulate a user click.
  90 if (core_useragent::is_ios()) {
  91     $PAGE->set_context(null);
  92     $PAGE->set_url('/local/mobile/launch.php', array('service' => $serviceshortname, 'passport' => $passport, 'urlscheme' => $urlscheme));
  93
  94     echo $OUTPUT->header();
  95     $notice = get_string('clickheretolaunchtheapp', 'tool_mobile');
  96     echo html_writer::link($location, $notice, array('id' => 'launchapp'));
  97     echo html_writer::script(
  98         "window.onload = function() {
  99             document.getElementById('launchapp').click();
 100         };"
 101     );
 102     echo $OUTPUT->footer();
 103 } else {
 104     // For Android a http redirect will do fine.
 105     header('Location: ' . $location);
 106     die;
 107 }