Add password generator proper and small word list

package-lock.json

@@ -523,7 +523,8 @@
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       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
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@@ -681,6 +682,7 @@
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+      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
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@@ -1142,7 +1144,8 @@
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       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
     },
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       "version": "1.6.2",
@@ -1227,6 +1230,11 @@
       "integrity": "sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=",
       "dev": true
     },
+    "core-js": {
+      "version": "2.5.7",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
+      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw=="
+    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -2272,6 +2280,11 @@
         "mime-types": "^2.1.12"
       }
     },
+    "form-serializer": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/form-serializer/-/form-serializer-2.5.0.tgz",
+      "integrity": "sha1-yuovrLwbzuf2VdkTZwcTPz+staM="
+    },
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       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
@@ -2318,7 +2331,8 @@
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
+      "dev": true
     },
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@@ -2929,6 +2943,7 @@
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+      "dev": true,
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
@@ -3444,6 +3459,7 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+      "dev": true,
       "requires": {
         "once": "^1.3.0",
         "wrappy": "1"
@@ -3452,7 +3468,8 @@
     "inherits": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+      "dev": true
     },
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@@ -4178,6 +4195,7 @@
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+      "dev": true,
       "requires": {
         "brace-expansion": "^1.1.7"
       }
@@ -4665,6 +4683,7 @@
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       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
       "requires": {
         "wrappy": "1"
       }
@@ -4853,7 +4872,8 @@
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "http://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
     },
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@@ -5583,6 +5603,7 @@
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+      "dev": true,
       "requires": {
         "glob": "^7.0.5"
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@@ -7323,7 +7344,8 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "xregexp": {
       "version": "4.0.0",

package.json

@@ -28,6 +28,8 @@
   "dependencies": {
     "bootstrap": "^4.1.3",
     "clipboard": "^2.0.4",
+    "core-js": "^2.5.7",
+    "form-serializer": "^2.5.0",
     "jquery": "^3.3.1",
     "octicons": "^8.1.3",
     "popper.js": "^1.14.5"

src/app.js

@@ -1,3 +1,4 @@
 import './app.scss'
 import './clipboard'
 import './navbar'
+import './ui'

src/app.scss

@@ -31,4 +31,8 @@ body {
 
 #password-bits {
   height: 1.5rem;
+
+  .bg-warning {
+    color: $body-color;
+  }
 }

src/generator.js

@@ -0,0 +1,62 @@
+import words from './words'
+
+const digits = '0123456789'
+const symbols = '`~!@#$%^&*()_+-=,./<>?;:|'
+
+export function getWordList (name) {
+  if (['small'].includes(name)) {
+    return words[name]
+  }
+  throw new Error(`Invalid word list: ${name}`)
+}
+
+export function getWords (list, indices) {
+  return Array.from(indices).map(index => list[index % list.length])
+}
+
+export function capitalize (string) {
+  return string[0].toUpperCase() + string.slice(1)
+}
+
+function pickWords (list, number) {
+  const array = new Uint16Array(number)
+  window.crypto.getRandomValues(array)
+  return getWords(list, array)
+}
+
+function pickChar (options) {
+  const array = new Uint32Array(1)
+  window.crypto.getRandomValues(array)
+  return options[array[0] % options.length]
+}
+
+export function generate (options) {
+  let words = pickWords(getWordList(options.list), options.count)
+
+  if (options.capitalize) {
+    words = words.map(capitalize)
+  }
+
+  if (options.symbol) {
+    words.push(pickChar(symbols))
+  }
+
+  if (options.digit) {
+    words.push(pickChar(digits))
+  }
+
+  return words.join('')
+}
+
+export function lengthBits (list) {
+  return Math.log2(list.length)
+}
+
+export function computeBits (options) {
+  const wordBits = lengthBits(getWordList(options.list))
+  const capsBits = options.capitalize ? 1 : 0
+  const symbolBits = options.symbol ? lengthBits(symbols) : 0
+  const digitBits = options.digit ? lengthBits(digits) : 0
+
+  return wordBits * options.count + capsBits + symbolBits + digitBits
+}

src/index.html

@@ -32,9 +32,8 @@
   <div class="jumbotron py-4">
     <p class="lead">This is a truly secure password generator that generates easy-to-remember passwords.</p>
     <hr class="my-4">
-    <form>
     <div class="input-group mb-3">
-        <input id="generated-password" class="form-control" type="text"
+      <input id="generated-password" class="form-control form-control-lg text-monospace" type="text"
              placeholder="Click the Generate button to generate a new password">
       <div class="input-group-append">
         <button class="btn btn-success copy" type="button" id="copy-password"
@@ -50,13 +49,14 @@
       </div>
     </div>
 
+    <form id="options-form">
       <div class="form-group row">
         <label for="word-list" class="col-sm-2 col-form-label">Word List</label>
         <div class="col-sm-10">
-          <select id="word-list" class="form-control custom-select">
+          <select id="word-list" class="form-control custom-select" name="list">
             <option value="small">2048 words (11 bits/word)</option>
-            <option value="medium">4096 words (12 bits/word)</option>
+            <option value="medium" disabled>4096 words (12 bits/word)</option>
-            <option value="large">8192 words (13 bits/word)</option>
+            <option value="large" disabled>8192 words (13 bits/word)</option>
           </select>
         </div>
       </div>
@@ -64,7 +64,7 @@
       <div class="form-group row">
         <label for="word-count" class="col-sm-2 col-form-label">Word Count</label>
         <div class="col-sm-10">
-          <input id="word-count" class="form-control" type="number" value="4">
+          <input id="word-count" class="form-control" type="number" name="count" value="5" min="1">
         </div>
       </div>
 
@@ -72,15 +72,15 @@
         <div class="pt-0 col-sm-2 col-form-label">Options</div>
         <div class="col-sm-10">
           <div class="form-check">
-            <input class="form-check-input" type="checkbox" id="use-capitalize">
+            <input class="form-check-input" type="checkbox" id="use-capitalize" name="capitalize">
             <label for="use-capitalize">Capitalize the first letter</label>
           </div>
           <div class="form-check">
-            <input class="form-check-input" type="checkbox" id="use-symbol">
+            <input class="form-check-input" type="checkbox" id="use-symbol" name="symbol">
             <label for="use-symbol">Add a symbol</label>
           </div>
           <div class="form-check">
-            <input class="form-check-input" type="checkbox" id="use-digit">
+            <input class="form-check-input" type="checkbox" id="use-digit" name="digit">
             <label for="use-digit">Add a digit</label>
           </div>
         </div>

src/ui.js

@@ -0,0 +1,50 @@
+import $ from 'jquery/dist/jquery'
+import 'form-serializer/jquery.serialize-object'
+
+import { generate, computeBits } from './generator'
+
+$(() => {
+  const $options = $('#options-form')
+  const $output = $('#generated-password')
+  const $bits = $('#password-bits').find('div')
+
+  $('#run-generator').click(() => {
+    const options = $options.serializeObject()
+    $output.val(generate(options))
+    return false
+  })
+
+  const classes = 'bg-danger bg-warning bg-info bg-success'
+
+  function bitClass (bits) {
+    if (bits < 44) {
+      return 'bg-danger'
+    } else if (bits < 64) {
+      return 'bg-warning'
+    } else if (bits < 80) {
+      return 'bg-info'
+    } else {
+      return 'bg-success'
+    }
+  }
+
+  function bitRound (value) {
+    const rounded = Math.round(value)
+    return rounded === value ? value : `≈ ${rounded}`
+  }
+
+  function updateBitMeter () {
+    const options = $options.serializeObject()
+    const bits = computeBits(options)
+    const maxBits = 96
+    $bits
+      .removeClass(classes)
+      .addClass(bitClass(bits))
+      .text(`${bitRound(bits)} bits`)
+      .css('width', `${bits / maxBits * 100}%`)
+  }
+
+  $options.find('select, input').change(updateBitMeter)
+  $options.find('input[type=nubmer]').on('input', updateBitMeter)
+  updateBitMeter()
+})

src/words/index.js

@@ -0,0 +1,5 @@
+import small from './2048'
+
+console.assert(small.length === 2048)
+
+export default { small }

webpack.config.js

@@ -2,7 +2,11 @@ const path = require('path')
 const HtmlWebpackPlugin = require('html-webpack-plugin')
 
 module.exports = {
-  entry: './src/app.js',
+  entry: [
+    'core-js/fn/array/from',
+    'core-js/fn/array/includes',
+    './src/app.js'
+  ],
   mode: process.env.NODE_ENV || 'development',
   output: {
     filename: '[name].[contenthash].js',