From 44298baa935916c61d8402122ed5801b1d973acd Mon Sep 17 00:00:00 2001
From: Max Wu
Date: Mon, 26 Feb 2018 16:46:59 +0800
Subject: Add migration for LZString compressed note id in history

Signed-off-by: Max Wu <jackymaxj@gmail.com>
---
 lib/history.js | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/lib/history.js b/lib/history.js
index f46ff49f..f3d4440e 100644
--- a/lib/history.js
+++ b/lib/history.js
@@ -1,6 +1,7 @@
 'use strict'
 // history
 // external modules
+var LZString = require('lz-string')
 
 // core
 var config = require('./config')
@@ -27,7 +28,26 @@ function getHistory (userid, callback) {
     }
     var history = {}
     if (user.history) {
-      history = parseHistoryToObject(JSON.parse(user.history))
+      history = JSON.parse(user.history)
+      // migrate LZString encoded note id to base64url encoded note id
+      for (let i = 0, l = history.length; i < l; i++) {
+        let item = history[i]
+        // try to parse in base64url
+        let id = models.Note.decodeNoteId(item.id)
+        if (!id || !models.Note.checkNoteIdValid(id)) {
+          // try to parse in LZString if it can't be parsed in base64url
+          try {
+            id = LZString.decompressFromBase64(item.id)
+          } catch (err) {
+            id = null
+          }
+          if (id && models.Note.checkNoteIdValid(id)) {
+            // replace the note id to base64url encoded note id
+            history[i].id = models.Note.encodeNoteId(id)
+          }
+        }
+      }
+      history = parseHistoryToObject(history)
     }
     if (config.debug) {
       logger.info('read history success: ' + user.id)
-- 
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