1 files changed, 32 insertions, 0 deletions
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('-')
+}