From 7fc5ef894e5302f8d51f8a2ac6cd254471e34065 Mon Sep 17 00:00:00 2001
From: Charles Severance <csev@umich.edu>
Date: Tue, 25 Aug 2020 11:49:49 -0400
Subject: [PATCH] Round trip topics from David / Dayton

---
 src/Controllers/Topics.php | 153 +++++++++++++++++++++++++++++++++++++
 src/Core/Application.php   |   2 +
 src/Templates/Topics.twig  |  11 +++
 3 files changed, 166 insertions(+)
 create mode 100644 src/Controllers/Topics.php
 create mode 100644 src/Templates/Topics.twig

diff --git a/src/Controllers/Topics.php b/src/Controllers/Topics.php
new file mode 100644
index 0000000..f9f9b37
--- /dev/null
+++ b/src/Controllers/Topics.php
@@ -0,0 +1,153 @@
+<?php
+
+
+namespace Koseu\Controllers;
+
+use Tsugi\Util\U;
+use Tsugi\Util\LTI;
+use Tsugi\Core\LTIX;
+use Silex\Application;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class Topics {
+
+    const ROUTE = '/topics';
+
+    const REDIRECT = 'koseu_controllers_topics';
+
+    public static function routes(Application $app, $prefix=self::ROUTE) {
+        $app->get($prefix, 'Koseu\\Controllers\\Topics::get');
+        $app->get($prefix.'/', 'Koseu\\Controllers\\Topics::get')->bind(self::REDIRECT);
+        $app->get($prefix.'/{anchor}', 'Koseu\\Controllers\\Topics::get');
+        $app->get($prefix.'_launch/{anchor}', 'Koseu\\Controllers\\Topics::launch');
+    }
+
+    public function get(Request $request, Application $app, $anchor=null)
+    {
+        global $CFG;
+        $tsugi = $app['tsugi'];
+
+        if ( ! isset($CFG->topics) ) {
+            die_with_error_log('Cannot find topics.json ($CFG->topics)');
+        }
+
+        // Turning on and off styling
+        if ( isset($_GET['nostyle']) ) {
+            if ( $_GET['nostyle'] == 'yes' ) {
+                $_SESSION['nostyle'] = 'yes';
+            } else {
+                unset($_SESSION['nostyle']);
+            }
+        }
+
+        // Load the Topic
+        $l = new \Tsugi\UI\Topics($CFG->topics,$anchor);
+
+        $context = array();
+        $context['head'] = $l->header(true);
+        $context['container'] = $l->render(true);
+        $context['footer'] = $l->footer(true);
+
+        return $app['twig']->render('@Koseu/Topics.twig',$context);
+
+    }
+
+    public function launch(Request $request, Application $app, $anchor=null)
+    {
+        global $CFG;
+        $tsugi = $app['tsugi'];
+
+        $path = U::rest_path();
+        $redirect_path = U::addSession($path->parent);
+        if ( $redirect_path == '') $redirect_path = '/';
+
+        if ( ! isset($CFG->topics) ) {
+            $app->tsugiFlashError(__('Cannot find topics.json ($CFG->topics)'));
+            return $app->redirect($redirect_path);
+        }
+
+        /// Load the Topic
+        $l = new \Tsugi\UI\Topics($CFG->topics);
+        if ( ! $l ) {
+            $app->tsugiFlashError(__('Cannot load topics.'));
+            return $app->redirect($redirect_path);
+        }
+
+        $topic = $l->getTopicByRlid($anchor);
+        if ( ! $topic ) {
+            $app->tsugiFlashError(__('Cannot find topic resource link id'));
+            return $app->redirect($redirect_path);
+        }
+
+        $lti = $l->getLtiByRlid($anchor);
+        if ( ! $lti ) {
+            $app->tsugiFlashError(__('Cannot find lti resource link id'));
+            return $app->redirect($redirect_path);
+        }
+
+        // Check that the session has the minimums...
+        if ( isset($topic->lti) && U::get($_SESSION,'secret') && U::get($_SESSION,'context_key')
+            && U::get($_SESSION,'user_key') && U::get($_SESSION,'displayname') && U::get($_SESSION,'email') )
+        {
+            // All good
+        } else {
+            $app->tsugiFlashError(__('Missing session data required for launch'));
+            return $app->redirect($redirect_path);
+        }
+
+        $resource_link_title = isset($lti->title) ? $lti->title : $topic->title;
+        $key = isset($_SESSION['oauth_consumer_key']) ? $_SESSION['oauth_consumer_key'] : false;
+        $secret = false;
+        if ( isset($_SESSION['secret']) ) {
+            $secret = LTIX::decrypt_secret($_SESSION['secret']);
+        }
+
+        $resource_link_id = $lti->resource_link_id;
+        $parms = array(
+            'lti_message_type' => 'basic-lti-launch-request',
+            'resource_link_id' => $resource_link_id,
+            'resource_link_title' => $resource_link_title,
+            'tool_consumer_info_product_family_code' => 'tsugi',
+            'tool_consumer_info_version' => '1.1',
+            'context_id' => $_SESSION['context_key'],
+            'context_label' => $CFG->context_title,
+            'context_title' => $CFG->context_title,
+            'user_id' => $_SESSION['user_key'],
+            'lis_person_name_full' => $_SESSION['displayname'],
+            'lis_person_contact_email_primary' => $_SESSION['email'],
+            'roles' => 'Learner'
+        );
+        if ( isset($_SESSION['avatar']) ) $parms['user_image'] = $_SESSION['avatar'];
+
+        if ( isset($lti->custom) ) {
+            foreach($lti->custom as $custom) {
+                if ( isset($custom->value) ) {
+                    $parms['custom_'.$custom->key] = $custom->value;
+                }
+                if ( isset($custom->json) ) {
+                    $parms['custom_'.$custom->key] = json_encode($custom->json);
+                }
+            }
+        }
+
+        $return_url = $path->parent . '/' . str_replace('_launch', '', $path->controller) . '/' . $topic->anchor;
+        $parms['launch_presentation_return_url'] = $return_url;
+
+        $sess_key = 'tsugi_top_nav_'.$CFG->wwwroot;
+        if ( isset($_SESSION[$sess_key]) ) {
+            // $parms['ext_tsugi_top_nav'] = $_SESSION[$sess_key];
+        }
+
+        $form_id = "tsugi_form_id_".bin2Hex(openssl_random_pseudo_bytes(4));
+        $parms['ext_lti_form_id'] = $form_id;
+
+        $endpoint = $lti->launch;
+        $parms = LTI::signParameters($parms, $endpoint, "POST", $key, $secret,
+            "Finish Launch", $CFG->wwwroot, $CFG->servicename);
+
+        $content = LTI::postLaunchHTML($parms, $endpoint, false /*debug */);
+        print($content);
+        return "";
+    }
+}
diff --git a/src/Core/Application.php b/src/Core/Application.php
index cb24818..5031104 100644
--- a/src/Core/Application.php
+++ b/src/Core/Application.php
@@ -1,5 +1,6 @@
 <?php
 
+
 namespace Koseu\Core;
 
 use Symfony\Component\HttpFoundation\Request;
@@ -20,6 +21,7 @@ public function __construct($launch)
         \Tsugi\Controllers\Login::routes($this);
         \Tsugi\Controllers\Logout::routes($this);
         \Koseu\Controllers\Lessons::routes($this);
+        \Koseu\Controllers\Topics::routes($this);
 
         // Tools that require logged in user
         if ( isset($launch->user->id) ) {
diff --git a/src/Templates/Topics.twig b/src/Templates/Topics.twig
new file mode 100644
index 0000000..c9c8d34
--- /dev/null
+++ b/src/Templates/Topics.twig
@@ -0,0 +1,11 @@
+{% extends "@Tsugi/Page.twig" %}
+{% block head %}
+
+{{ head | raw }}
+{% endblock %}
+{% block content %}
+{{ container | raw }}
+{% endblock %}
+{% block footer %}
+{{ footer | raw }}
+{% endblock %}