From d08c9522c0dd414a6fed1671064701160d233603 Mon Sep 17 00:00:00 2001
From: Max Wu
Date: Sat, 3 Mar 2018 16:25:30 +0800
Subject: Update to migrate note url in the history of browser storage and
 cookie Signed-off-by: Max Wu <jackymaxj@gmail.com>

---
 public/js/utils.js | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 public/js/utils.js

(limited to 'public/js/utils.js')

diff --git a/public/js/utils.js b/public/js/utils.js
new file mode 100644
index 00000000..91e7f133
--- /dev/null
+++ b/public/js/utils.js
@@ -0,0 +1,32 @@
+import base64url from 'base64url'
+
+let uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
+
+export function checkNoteIdValid (id) {
+  let result = id.match(uuidRegex)
+  if (result && result.length === 1) {
+    return true
+  } else {
+    return false
+  }
+}
+
+export function encodeNoteId (id) {
+  // remove dashes in UUID and encode in url-safe base64
+  let str = id.replace(/-/g, '')
+  let hexStr = Buffer.from(str, 'hex')
+  return base64url.encode(hexStr)
+}
+
+export function decodeNoteId (encodedId) {
+  // decode from url-safe base64
+  let id = base64url.toBuffer(encodedId).toString('hex')
+  // add dashes between the UUID string parts
+  let idParts = []
+  idParts.push(id.substr(0, 8))
+  idParts.push(id.substr(8, 4))
+  idParts.push(id.substr(12, 4))
+  idParts.push(id.substr(16, 4))
+  idParts.push(id.substr(20, 12))
+  return idParts.join('-')
+}
-- 
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