From 99fdcac63e9a5a55a95c31ef569f025d2f25876d Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Fri, 26 Nov 2010 11:57:04 -0500
Subject: Fix JavaScript unit unurlification; URL blessing client-side

---
 lib/js/urweb.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'lib/js')

diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 8ca6b89c..f98476b7 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -1182,5 +1182,26 @@ function confrm(s) {
 }
 
 
+// URL blessing
+
+var urlRules = null;
+
+function checkUrl(s) {
+    for (var r = urlRules; r; r = r.next) {
+        var ru = r.data;
+        if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
+            return ru.allow ? s : null;
+    }
+
+    return null;
+}
+
+function bless(s) {
+    u = checkUrl(s);
+    if (u == null)
+        er("Disallowed URL: " + s);
+    return u;
+}
+
 // App-specific code
 
-- 
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