Add download/verify script

package.json

@@ -7,7 +7,8 @@
     "coverage": "nyc --branches 100 --functions 100 --check-coverage npm run unit",
     "standard": "standard",
     "test": "npm run standard && npm run unit",
-    "unit": "tape test/*.js"
+    "unit": "tape test/*.js",
+    "update": "node -e \"require('./util/wordlists').update()\""
   },
   "author": "Wei Lu",
   "contributors": [
@@ -29,6 +30,7 @@
     "unorm": "^1.3.3"
   },
   "devDependencies": {
+    "node-fetch": "^1.6.3",
     "nyc": "^8.3.0",
     "proxyquire": "^1.7.10",
     "standard": "*",

test/index.js

@@ -1,5 +1,6 @@
 var bip39 = require('../')
 var proxyquire = require('proxyquire')
+var download = require('../util/wordlists').download
 var WORDLISTS = {
   english: require('../wordlists/english.json'),
   japanese: require('../wordlists/japanese.json'),
@@ -116,3 +117,13 @@ test('exposes standard wordlists', function (t) {
   t.same(bip39.wordlists.EN, WORDLISTS.english)
   t.equal(bip39.wordlists.EN.length, 2048)
 })
+
+test('verify wordlists from https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md', function (t) {
+  download().then(function (wordlists) {
+    Object.keys(wordlists).forEach(function (name) {
+      t.same(bip39.wordlists[name], wordlists[name])
+    })
+
+    t.end()
+  })
+})

util/wordlists.js

@@ -0,0 +1,49 @@
+var fetch = require('node-fetch')
+var fs = require('fs')
+var path = require('path')
+
+var log = console.log
+var WORDLISTS = ['english', 'french', 'italian', 'japanese', 'spanish']
+
+function update () {
+  download().then(function (wordlists) {
+    var promises = Object.keys(wordlists).map(function (name) { return save(name, wordlists[name]) })
+    return Promise.all(promises)
+  })
+}
+
+function download () {
+  var wordlists = {}
+
+  var promises = WORDLISTS.map(function (name) {
+    return fetchRaw(name).then(toJSON).then(function (wordlist) { wordlists[name] = wordlist })
+  })
+
+  return Promise.all(promises).then(function () { return wordlists })
+}
+
+function fetchRaw (name) {
+  var url = 'https://raw.githubusercontent.com/bitcoin/bips/master/bip-0039/' + name + '.txt'
+  log('download ' + url)
+
+  return fetch(url).then(function (response) { return response.text() })
+}
+
+function toJSON (content) {
+  return content.trim().split('\n').map(function (word) { return word.trim() })
+}
+
+function save (name, wordlist) {
+  var location = path.join(__dirname, '..', 'wordlists', name + '.json')
+  var content = JSON.stringify(wordlist, null, 2) + '\n'
+  log('save ' + wordlist.length + ' words to ' + location)
+
+  return new Promise(function (resolve, reject) {
+    fs.writeFile(location, content, function (err) {
+      if (err) reject(err)
+      else resolve()
+    })
+  })
+}
+
+module.exports = { update: update, download: download }

wordlists/french.json

@@ -1,4 +1,4 @@
-[
+[
   "abaisser",
   "abandon",
   "abdiquer",