From: Mike Taylor <mike@indexdata.com>
Date: Thu, 12 Jun 2014 16:33:18 +0000 (+0100)
Subject: Set window.name on creation of new tab.
X-Git-Tag: 1.0.0~479^2~3^2~1
X-Git-Url: http://git.indexdata.com/?p=mkws-moved-to-github.git;a=commitdiff_plain;h=f572e9a4431f1ec0da7e13e65f0806e8b242452a

Set window.name on creation of new tab.
Enables pz2.js to create tab-specific cookies.
---

diff --git a/src/mkws-core.js b/src/mkws-core.js
index a8c0470..6123235 100644
--- a/src/mkws-core.js
+++ b/src/mkws-core.js
@@ -6,6 +6,23 @@
 "use strict"; // HTML5: disable for log_level >= 2
 
 
+// Incredible that the standard JavaScript runtime doesn't define a
+// unique windowId. Instead, we have to make one up. And since there's
+// no global area shared between windows, the best we can do for
+// ensuring uniqueness is generating a random ID and crossing our
+// fingers. We stash this in window.name, as it's the only place to
+// keep data that is preserved across reloads and within-site
+// navigation. pz2.js picks this up and uses it as part of the
+// cookie-name, to ensure each tab gets its own session.
+if (window.name) {
+  console.log("Using existing window.name '" + window.name + "'");
+} else {
+  // Ten chars from 26 alpha-numerics = 36^10 = 3.65e15 combinations.
+  // At one per second, it will take 116 million years to duplicate a session
+  window.name = Math.random().toString(36).slice(2, 12);
+  console.log("Generated new window.name '" + window.name + "'");
+}
+
 // Set up global mkws object. Contains truly global state such as SP
 // authentication, and a hash of team objects, indexed by team-name.
 //