From baa0418fb54fb8f158267f8e8b5f248232dc0a8f Mon Sep 17 00:00:00 2001
From: Max Wu
Date: Mon, 26 Feb 2018 16:43:29 +0800
Subject: Remove and replace all note id compression in LZString with base64url

Signed-off-by: Max Wu <jackymaxj@gmail.com>
---
 lib/models/note.js | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'lib/models/note.js')

diff --git a/lib/models/note.js b/lib/models/note.js
index 484f1a8c..e199a3db 100644
--- a/lib/models/note.js
+++ b/lib/models/note.js
@@ -3,6 +3,7 @@
 var fs = require('fs')
 var path = require('path')
 var LZString = require('lz-string')
+var base64url = require('base64url')
 var md = require('markdown-it')()
 var metaMarked = require('meta-marked')
 var cheerio = require('cheerio')
@@ -114,6 +115,22 @@ module.exports = function (sequelize, DataTypes) {
           return false
         }
       },
+      encodeNoteId: function (id) {
+        // remove dashes in UUID and encode in url-safe base64
+        return base64url.encode(id.replace(/-/g, ''))
+      },
+      decodeNoteId: function (encodedId) {
+        // decode from url-safe base64
+        let id = base64url.decode(encodedId)
+        // 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('-')
+      },
       checkNoteIdValid: function (id) {
         var 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
         var result = id.match(uuidRegex)
@@ -190,6 +207,16 @@ module.exports = function (sequelize, DataTypes) {
               return _callback(err, null)
             })
           },
+          parseNoteIdByBase64Url: function (_callback) {
+            // try to parse note id by base64url
+            try {
+              var id = Note.decodeNoteId(noteId)
+              if (id && Note.checkNoteIdValid(id)) { return callback(null, id) } else { return _callback(null, null) }
+            } catch (err) {
+              return _callback(err, null)
+            }
+          },
+          // parse note id by LZString is deprecated, here for compability
           parseNoteIdByLZString: function (_callback) {
             // try to parse note id by LZString Base64
             try {
-- 
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