JS Offline tracking (#15970)

* JS Offline tracking

* minor tweaks

* add some tests

* add some tests

* apply review feedback

1 files changed, 11 insertions, 1 deletions

diff --git a/core/Tracker/Request.php b/core/Tracker/Request.php
index 93d64d0781..0d6c449ab7 100644
--- a/core/Tracker/Request.php
+++ b/core/Tracker/Request.php
@@ -398,6 +398,7 @@ class Request
             // some visitor attributes can be overwritten
             'cip'          => array('', 'string'),
             'cdt'          => array('', 'string'),
+            'cdo'          => array('', 'int'),
             'cid'          => array('', 'string'),
             'uid'          => array('', 'string'),
 
@@ -484,11 +485,16 @@ class Request
 
     protected function getCustomTimestamp()
     {
-        if (!$this->hasParam('cdt')) {
+        if (!$this->hasParam('cdt') && !$this->hasParam('cdo')) {
             return false;
         }
 
         $cdt = $this->getParam('cdt');
+        $cdo = $this->getParam('cdo');
+
+        if (empty($cdt) && $cdo) {
+            $cdt = $this->timestamp;
+        }
 
         if (empty($cdt)) {
             return false;
@@ -498,6 +504,10 @@ class Request
             $cdt = strtotime($cdt);
         }
 
+        if (!empty($cdo)) {
+            $cdt = $cdt - abs($cdo);
+        }
+
         if (!$this->isTimestampValid($cdt, $this->timestamp)) {
             Common::printDebug(sprintf("Datetime %s is not valid", date("Y-m-d H:i:m", $cdt)));
             return false;