2 files changed, 47 insertions, 0 deletions
diff --git a/public/js/history.js b/public/js/history.js
index e14b80d8..e7d289fb 100644
--- a/public/js/history.js
+++ b/public/js/history.js
@@ -3,6 +3,12 @@
 
 import store from 'store'
 import S from 'string'
+import LZString from 'lz-string'
+
+import {
+  checkNoteIdValid,
+  encodeNoteId
+} from './utils'
 
 import {
     checkIfAuth
@@ -291,6 +297,15 @@ function parseToHistory (list, notehistory, callback) {
   else if (!list || !notehistory) callback(list, notehistory)
   else if (notehistory && notehistory.length > 0) {
     for (let i = 0; i < notehistory.length; i++) {
+      // migrate LZString encoded id to base64url encoded id
+      try {
+        let id = LZString.decompressFromBase64(notehistory[i].id)
+        if (id && checkNoteIdValid(id)) {
+          notehistory[i].id = encodeNoteId(id)
+        }
+      } catch (err) {
+        // na
+      }
             // parse time to timestamp and fromNow
       const timestamp = (typeof notehistory[i].time === 'number' ? moment(notehistory[i].time) : moment(notehistory[i].time, 'MMMM Do YYYY, h:mm:ss a'))
       notehistory[i].timestamp = timestamp.valueOf()
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('-')
+}