From 6d29cccf04583f696a7cc2fe0becfb53be976bb7 Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Thu, 3 Aug 2017 13:48:59 +0800
Subject: [PATCH] MDL-59668 mod_lti: use 'forceview' param to keep nav flow
 consistent

Part of MDL-59313.
---
 mod/lti/view.php | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/mod/lti/view.php b/mod/lti/view.php
index 3b90377fdd1..224b219c6bf 100644
--- a/mod/lti/view.php
+++ b/mod/lti/view.php
@@ -53,6 +53,7 @@ require_once($CFG->dirroot.'/mod/lti/locallib.php');
 
 $id = optional_param('id', 0, PARAM_INT); // Course Module ID, or
 $l  = optional_param('l', 0, PARAM_INT);  // lti ID.
+$forceview = optional_param('forceview', 0, PARAM_BOOL);
 
 if ($l) {  // Two ways to specify the module.
     $lti = $DB->get_record('lti', array('id' => $l), '*', MUST_EXIST);
@@ -89,7 +90,10 @@ if ($launchcontainer == LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS) {
     $PAGE->set_pagelayout('frametop'); // Most frametops don't include footer, and pre-post blocks.
     $PAGE->blocks->show_only_fake_blocks(); // Disable blocks for layouts which do include pre-post blocks.
 } else if ($launchcontainer == LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW) {
-    redirect('launch.php?id=' . $cm->id);
+    if (!$forceview) {
+        $url = new moodle_url('/mod/lti/launch.php', array('id' => $cm->id));
+        redirect($url);
+    }
 } else {
     $PAGE->set_pagelayout('incourse');
 }
@@ -113,11 +117,13 @@ if ($lti->showdescriptionlaunch && $lti->intro) {
 }
 
 if ( $launchcontainer == LTI_LAUNCH_CONTAINER_WINDOW ) {
-    echo "<script language=\"javascript\">//<![CDATA[\n";
-    echo "window.open('launch.php?id=".$cm->id."&triggerview=0','lti-".$cm->id."');";
-    echo "//]]\n";
-    echo "</script>\n";
-    echo "<p>".get_string("basiclti_in_new_window", "lti")."</p>\n";
+    if (!$forceview) {
+        echo "<script language=\"javascript\">//<![CDATA[\n";
+        echo "window.open('launch.php?id=" . $cm->id . "&triggerview=0','lti-" . $cm->id . "');";
+        echo "//]]\n";
+        echo "</script>\n";
+        echo "<p>".get_string("basiclti_in_new_window", "lti")."</p>\n";
+    }
     $url = new moodle_url('/mod/lti/launch.php', array('id' => $cm->id));
     echo html_writer::start_tag('p');
     echo html_writer::link($url, get_string("basiclti_in_new_window_open", "lti"), array('target' => '_blank'));