[Kimchi-devel] [PATCH V2] add a base64 safe url encode and decode to js utils

[shaohef at linux.vnet.ibm.com]

From: ShaoHe Feng <shaohef at linux.vnet.ibm.com>

Most webs use safe url base64 encode/decode to escape the special characters.

base64 encode/decode is similar to base64 safe url encode/decode.

The difference is the alphabet.
The base64 safe url alphabet uses '-' instead of '+' and '_' instead of '/'.

after this patch:
In backend, we can encode an url:
>>> base64.urlsafe_b64encode("/vnc_auto.html?port=64667&path=?token=opensuse12&encrypt=1")
'L3ZuY19hdXRvLmh0bWw_cG9ydD02NDY2NyZwYXRoPT90b2tlbj1vcGVuc3VzZTEyJmVuY3J5cHQ9MQ=='
and in UI, we can decode it:
kimchi.urlSafeB64Decode("L3ZuY19hdXRvLmh0bWw_cG9ydD02NDY2NyZwYXRoPT90b2tlbj1vcGVuc3VzZTEyJmVuY3J5cHQ9MQ==")
"/vnc_auto.html?port=64667&path=?token=opensuse12&encrypt=1"

or

In UI, we can encode an url:
kimchi.urlSafeB64Encode("/vnc_auto.html?port=64667&path=?token=opensuse12&encrypt=1")
"L3ZuY19hdXRvLmh0bWw_cG9ydD02NDY2NyZwYXRoPT90b2tlbj1vcGVuc3VzZTEyJmVuY3J5cHQ9MQ=="
and in backend, we can decode it:
>>> base64.urlsafe_b64decode("L3ZuY19hdXRvLmh0bWw_cG9ydD02NDY2NyZwYXRoPT90b2tlbj1vcGVuc3VzZTEyJmVuY3J5cHQ9MQ==")
'/vnc_auto.html?port=64667&path=?token=opensuse12&encrypt=1'

Safe url base64 is a variant of base64.
More info:
http://en.wikipedia.org/wiki/Base64#Implementations_and_history

Signed-off-by: ShaoHe Feng <shaohef at linux.vnet.ibm.com>
---
 ui/js/src/kimchi.utils.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ui/js/src/kimchi.utils.js b/ui/js/src/kimchi.utils.js
index c7103f8..480b9b5 100644
--- a/ui/js/src/kimchi.utils.js
+++ b/ui/js/src/kimchi.utils.js
@@ -183,3 +183,11 @@ kimchi.escapeStr = function(str) {
 
     return str;
 };
+
+kimchi.urlSafeB64Decode = function(str) {
+    return atob(str.replace(/-/g, '+').replace(/_/g, '/'));
+}
+
+kimchi.urlSafeB64Encode = function(str) {
+    return btoa(str).replace(/\+/g, '-').replace(/\//g, '_');
+}
-- 
1.9.3