diff --git a/calendar/export.php b/calendar/export.php
index d43f66564873c..5d72d2a30272a 100644
--- a/calendar/export.php
+++ b/calendar/export.php
@@ -59,6 +59,7 @@
 $day  = optional_param('cal_d', 0, PARAM_INT);
 $mon  = optional_param('cal_m', 0, PARAM_INT);
 $yr   = optional_param('cal_y', 0, PARAM_INT);
+$generateurl = optional_param('generateurl', 0, PARAM_BOOL);
 
 if ($courseid != SITEID && !empty($courseid)) {
     $course = $DB->get_record('course', array('id' => $courseid));
@@ -93,6 +94,7 @@
 $calendar->prepare_for_view($course, $courses);
 
 $pagetitle = get_string('export', 'calendar');
+$now = usergetdate(time());
 
 // Print title and header
 if ($issite) {
@@ -122,8 +124,8 @@
         if (isset($CFG->calendar_weekend)) {
             $weekend = intval($CFG->calendar_weekend);
         }
-        $username = $USER->username;
-        $authtoken = sha1($USER->username . $USER->password . $CFG->calendar_exportsalt);
+
+        $authtoken = sha1($USER->id . $USER->password . $CFG->calendar_exportsalt);
         // Let's populate some vars to let "common tasks" be somewhat smart...
         // If today it's weekend, give the "next week" option
         $allownextweek  = $weekend & (1 << $now['wday']);
@@ -131,9 +133,19 @@
         $allownextmonth = calendar_days_in_month($now['mon'], $now['year']) - $now['mday'] < 7;
         // If today it's weekend but tomorrow it isn't, do NOT give the "this week" option
         $allowthisweek  = !(($weekend & (1 << $now['wday'])) && !($weekend & (1 << (($now['wday'] + 1) % 7))));
-        echo $renderer->basic_export_form($allowthisweek, $allownextweek, $allownextmonth, $username, $authtoken);
+        echo $renderer->basic_export_form($allowthisweek, $allownextweek, $allownextmonth, $USER->id, $authtoken);
         break;
 }
 
+if (!empty($generateurl)) {
+    $params['userid']      = optional_param('userid', 0, PARAM_INT);
+    $params['authtoken']   = optional_param('authtoken', '', PARAM_ALPHANUM);
+    $params['preset_what'] = optional_param('preset_what', 'all', PARAM_ALPHA);
+    $params['preset_time'] = optional_param('preset_time', 'weeknow', PARAM_ALPHA);
+
+    $link = new moodle_url('/calendar/export_execute.php', $params);
+    print html_writer::tag('div', get_string('calendarurl', 'calendar', $link->out()), array('class' => 'generalbox calendarurl'));
+}
+
 echo $renderer->complete_layout();
 echo $OUTPUT->footer();
diff --git a/calendar/export_execute.php b/calendar/export_execute.php
index e50123eb6a474..7f195becba551 100644
--- a/calendar/export_execute.php
+++ b/calendar/export_execute.php
@@ -5,21 +5,29 @@
 require_once($CFG->dirroot.'/calendar/lib.php');
 require_once($CFG->libdir.'/bennu/bennu.inc.php');
 
-$username = required_param('username', PARAM_TEXT);
+$userid = optional_param('userid', 0, PARAM_INT);
+$username = optional_param('username', '', PARAM_TEXT);
 $authtoken = required_param('authtoken', PARAM_ALPHANUM);
+$generateurl = optional_param('generateurl', '', PARAM_TEXT);
 
 if (empty($CFG->enablecalendarexport)) {
     die('no export');
 }
 
 //Fetch user information
-if (!$user = $DB->get_record('user', array('username' => $username), 'id,password')) {
-   //No such user
+$checkuserid = !empty($userid) && $user = $DB->get_record('user', array('id' => $userid), 'id,password');
+//allowing for fallback check of old url - MDL-27542
+$checkusername = !empty($username) && $user = $DB->get_record('user', array('username' => $username), 'id,password');
+if (!$checkuserid && !$checkusername) {
+    //No such user
     die('Invalid authentication');
 }
 
 //Check authentication token
-if ($authtoken != sha1($username . $user->password . $CFG->calendar_exportsalt)) {
+$authuserid = !empty($userid) && $authtoken == sha1($userid . $user->password . $CFG->calendar_exportsalt);
+//allowing for fallback check of old url - MDL-27542
+$authusername = !empty($username) && $authtoken == sha1($username . $user->password . $CFG->calendar_exportsalt);
+if (!$authuserid && !$authusername) {
     die('Invalid authentication');
 }
 
@@ -31,6 +39,20 @@
 $allowed_what = array('all', 'courses');
 $allowed_time = array('weeknow', 'weeknext', 'monthnow', 'monthnext', 'recentupcoming');
 
+if (!empty($generateurl)) {
+    $authtoken = sha1($user->id . $user->password . $CFG->calendar_exportsalt);
+    $params = array();
+    $params['preset_what'] = $what;
+    $params['preset_time'] = $time;
+    $params['userid'] = $userid;
+    $params['authtoken'] = $authtoken;
+    $params['generateurl'] = true;
+
+    $link = new moodle_url('/calendar/export.php', $params);
+    redirect($link->out());
+    die;
+}
+
 if(!empty($what) && !empty($time)) {
     if(in_array($what, $allowed_what) && in_array($time, $allowed_time)) {
         $courses = enrol_get_users_courses($user->id, true, 'id, visible, shortname');
diff --git a/calendar/lib.php b/calendar/lib.php
index 5255a728e3ce4..c60e6b63e3530 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -1806,7 +1806,7 @@ protected function calculate_context(stdClass $data) {
             $group = $DB->get_record('groups', array('id'=>$data->groupid));
             $context = get_context_instance(CONTEXT_COURSE, $group->courseid);
         } else if (isset($data->userid) && $data->userid > 0 && $data->userid == $USER->id) {
-            $context =  get_context_instance(CONTEXT_USER);
+            $context =  get_context_instance(CONTEXT_USER, $data->userid);
         } else if (isset($data->userid) && $data->userid > 0 && $data->userid != $USER->id &&
                    isset($data->instance) && $data->instance > 0) {
             $cm = get_coursemodule_from_instance($data->modulename, $data->instance, 0, false, MUST_EXIST);
diff --git a/calendar/renderer.php b/calendar/renderer.php
index 48d1ef365a887..312c572ec02a6 100644
--- a/calendar/renderer.php
+++ b/calendar/renderer.php
@@ -34,11 +34,11 @@ class core_calendar_renderer extends plugin_renderer_base {
      * @param bool $allowthisweek
      * @param bool $allownextweek
      * @param bool $allownextmonth
-     * @param string $username
+     * @param int $userid
      * @param string $authtoken
      * @return string
      */
-    public function basic_export_form($allowthisweek, $allownextweek, $allownextmonth, $username, $authtoken) {
+    public function basic_export_form($allowthisweek, $allownextweek, $allownextmonth, $userid, $authtoken) {
 
         $output  = html_writer::tag('div', get_string('export', 'calendar'), array('class'=>'header'));
         $output .= html_writer::start_tag('fieldset');
@@ -86,10 +86,10 @@ public function basic_export_form($allowthisweek, $allownextweek, $allownextmont
         $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_d', 'value'=>''));
         $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_m', 'value'=>''));
         $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_y', 'value'=>''));
-        $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'username', 'value'=>$username));
+        $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'userid', 'value'=>$userid));
         $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'authtoken', 'value'=>$authtoken));
 
-        $output .= html_writer::empty_tag('input', array('type'=>'button', 'id'=>'generateurl', 'value'=>get_string('generateurlbutton', 'calendar')));
+        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name' => 'generateurl', 'id'=>'generateurl', 'value'=>get_string('generateurlbutton', 'calendar')));
         $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('exportbutton', 'calendar')));
 
         $output .= html_writer::end_tag('div');
@@ -102,8 +102,6 @@ public function basic_export_form($allowthisweek, $allownextweek, $allownextmont
         $output .= html_writer::tag('div', '', array('id'=>'url', 'style'=>'overflow:scroll;width:650px;'));
         $output .= html_writer::end_tag('div');
 
-        $this->page->requires->yui_module('moodle-calendar-eventmanager', 'M.core_calendar.init_basic_export', array($allowthisweek, $allownextweek, $allownextmonth, $username, $authtoken));
-
         return $output;
     }
 
diff --git a/calendar/view.php b/calendar/view.php
index 8f6b0846df0cf..31c3ee2220f40 100644
--- a/calendar/view.php
+++ b/calendar/view.php
@@ -150,8 +150,8 @@
 if (!empty($CFG->enablecalendarexport)) {
     echo $OUTPUT->single_button(new moodle_url('export.php', array('course'=>$courseid)), get_string('exportcalendar', 'calendar'));
     if (isloggedin()) {
-        $authtoken = sha1($USER->username . $USER->password . $CFG->calendar_exportsalt);
-        $link = new moodle_url('/calendar/export_execute.php', array('preset_what'=>'all', 'preset_time'=>'recentupcoming', 'username'=>$USER->username, 'authtoken'=>$authtoken));
+        $authtoken = sha1($USER->id . $USER->password . $CFG->calendar_exportsalt);
+        $link = new moodle_url('/calendar/export_execute.php', array('preset_what'=>'all', 'preset_time'=>'recentupcoming', 'userid' => $USER->id, 'authtoken'=>$authtoken));
         $icon = html_writer::empty_tag('img', array('src'=>$OUTPUT->pix_url('i/ical'), 'height'=>'14', 'width'=>'36', 'alt'=>get_string('ical', 'calendar'), 'title'=>get_string('quickdownloadcalendar', 'calendar')));
         echo html_writer::tag('a', $icon, array('href'=>$link));
     }
diff --git a/calendar/yui/eventmanager/eventmanager.js b/calendar/yui/eventmanager/eventmanager.js
index 7ee57043f9888..578ba81d4cd0c 100644
--- a/calendar/yui/eventmanager/eventmanager.js
+++ b/calendar/yui/eventmanager/eventmanager.js
@@ -120,26 +120,6 @@ YUI.add('moodle-calendar-eventmanager', function(Y) {
     var EVENTMANAGER = {
         add_event : function(config) {
             new EVENT(config);
-        },
-        init_basic_export : function(allowthisweek, allownextweek, allownextmonth, username, authtoken) {
-            var params = {
-                preset_what : (Y.one('#pw_course').get('checked'))?'courses':'all',
-                preset_time : 'recentupcoming',
-                username : username,
-                authtoken : authtoken
-
-            }
-            if (allowthisweek && Y.one('#pt_wknow').get('checked')) {
-                params.presettime = 'weeknow';
-            } else if (allownextweek && Y.one('#pt_wknext').get('checked')) {
-                params.presettime = 'weeknext';
-            } else if (allownextmonth && Y.one('#pt_monnext').get('checked')) {
-                params.presettime = 'monthnext';
-            } else if (Y.one('#pt_monnow').get('checked')) {
-                params.presettime = 'monthnow';
-            }
-            Y.one('#url').setContent(M.cfg.wwwroot+'/calendar/export_execute.php?'+build_querystring(params));
-            Y.one('#urlbox').setStyle('display', 'block');
         }
     }
 
diff --git a/lang/en/calendar.php b/lang/en/calendar.php
index b9bcdf0f453f5..5157014e63e75 100644
--- a/lang/en/calendar.php
+++ b/lang/en/calendar.php
@@ -28,6 +28,7 @@
 $string['calendar'] = 'Calendar';
 $string['calendarheading'] = '{$a} Calendar';
 $string['calendarpreferences'] = 'Calendar preferences';
+$string['calendarurl'] = 'Calendar URL: {$a}';
 $string['clickhide'] = 'click to hide';
 $string['clickshow'] = 'click to show';
 $string['commontasks'] = 'Options';