brfcgen/index.html at master · libitx/brfcgen · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>BRFCgen — Easily generate BRFC IDs</title>
  <meta name="title" content="BRFCgen — Easily generate BRFC IDs">
  <meta name="description" content="Easily generate BRFC (Bitcoin Request for Comment) IDs for your Bitcoin Specifications">
  <meta name="keywords" content="Bitcoin, BSV, BRFC Specifications">
  <link rel="icon" type="image/png" href="/images/favicon.png">

  <link rel="stylesheet"
    href="https://cdnjs.cloudflare.com/ajax/libs/tachyons/4.11.1/tachyons.min.css"
    integrity="sha512-d0v474klOFSF7qD9WDvyRxAvXaWSxCHDZdnBSZQjo8BpVr6vpjwAgqetpqkKP38DzlOzdVPaLVnzzW1Ba8wB9w=="
    crossorigin="anonymous">
  <script src="https://cdn.jsdelivr.net/gh/alpinejs/alpine@v2.8.0/dist/alpine.min.js"
    crossorigin="anonymous" defer></script>

  <style>
    /*
      A sprinkling of CSS to power light/dark mode and some snazzy and
      (admittedly) superfluous background colour effects. I just wanted to play
      with CSS custom properties.
    */

    html, body {
      height: 100%;
    }

    body {
      --col: #333333;
      --bg1: #F4F4F4;
      --bg2: #F4F4F4;

      color: var(--col, #F4F4F4);
      background-color: var(--bg2, #F4F4F4);
      background-image: radial-gradient(circle, var(--bg1, #F4F4F4) 6rem, var(--bg2, #F4F4F4));
    }

    .panel {
      background-color: rgba(255, 255, 255, 0.65);
      box-shadow: 0 0 1rem 1px rgba(0, 0, 0, 0.1);
    }

    .input {
      color: #222222;
      background-color: rgba(255, 255, 255, 0.1);
      border: 1px solid rgba(0, 0, 0, 0.1);
    }

    .input:focus {
      box-shadow: 0 0 3px 1px rgba(150, 204, 255, 0.5);
    }

    .link {
      color: inherit;
    }

    .link:hover {
      color: #FF41B4;
    }

    @media (prefers-color-scheme: dark) {
      body {
        --col: #F4F4F4;
        --bg1: #333333;
        --bg2: #333333;
      }

      .panel {
        background-color: rgba(0, 0, 0, 0.35);
      }

      .input {
        color: #ffffff;
        background-color: rgba(0, 0, 0, 0.1);
        border: 1px solid rgba(0, 0, 0, 0.3);
      }
    }
  </style>

  <!-- Open Graph / Facebook -->
  <meta property="og:type" content="website">
  <meta property="og:url" content="https://libitx.github.io/brfcgen/">
  <meta property="og:title" content="BRFCgen — Easily generate BRFC IDs">
  <meta property="og:description" content="Easily generate BRFC (Bitcoin Request for Comment) IDs for your Bitcoin Specifications">
  <meta property="og:image" content="https://libitx.github.io/brfcgen/images/card.jpg">

  <!-- Twitter -->
  <meta property="twitter:card" content="summary_large_image">
  <meta property="twitter:url" content="https://libitx.github.io/brfcgen/">
  <meta property="twitter:title" content="BRFCgen — Easily generate BRFC IDs">
  <meta property="twitter:description" content="Easily generate BRFC (Bitcoin Request for Comment) IDs for your Bitcoin Specifications">
  <meta property="twitter:image" content="https://libitx.github.io/brfcgen/images/card.jpg">
</head>

<body class="sans-serif ph3 ph4-l">
  <div class="flex flex-column min-h-100 mw6 pt3 center">
    <div class="flex flex-auto flex-column justify-center">

      <div class="pa3 pa4-ns br4 | panel"
        x-data="brfcGen()"
        x-init="$watch('brfc', onChange)">

        <h1 class="mt0 mb2 f3 lh-title fw9 tracked underline">
          BRFC<span class="fw7 o-70">gen</span>
        </h1>
        <p class="mt0 mb3 f7 lh-copy fw3 o-80">
          Generate <a href="http://bsvalias.org/01-02-brfc-id-assignment.html" class="link fw6 underline">BRFC IDs</a>
          with <span class="fw6 tracked ttu">snazzy</span> colours just for the f<span class="fw4">*</span>ck of it.
        </p>

        <div class="mv3 mv4-l">
          <label class="db mb2 f7 fw3 lh-block o-60"
            for="title">
            Title
          </label>
          <input type="text"
            class="input-reset w-100 pa2 f4 fw5 br2 bn outline-0 | input"
            id="title"
            x-model="title"
            x-on:keyup="recalc()"
            x-on:blur="recalc(true)" />
        </div>

        <div class="mv3 mv4-l">
          <label class="db mb2 f7 fw3 lh-block o-60"
            for="author">
            Author(s)
          </label>
          <input type="text"
            class="input-reset w-100 pa2 f4 fw5 br2 bn outline-0 | input"
            id="author"
            x-model="author"
            x-on:keyup="recalc()"
            x-on:blur="recalc(true)" />
        </div>

        <div class="mv3 mv4-l">
          <label class="db mb2 f7 fw3 lh-block o-60"
            for="version">
            Version
          </label>
          <input type="text"
            class="input-reset w-100 pa2 f4 fw5 br2 bn outline-0 | input"
            id="version"
            x-model="version"
            x-on:keyup="recalc()"
            x-on:blur="recalc(true)" />
        </div>

        <div class="mv3 mv4-l">
          <label class="db mb2 f7 fw3 lh-block o-60"
            for="brfc">
            BRFC
          </label>
          <input type="text"
            class="input-reset w-100 pa2 code f3 fw5 br2 bn outline-0 | input"
            id="brfc"
            x-model="brfc"
            x-on:focus="setTimeout(_ => $event.target.select())"
            readonly />
        </div>
      </div>

    </div>

    <footer class="pv3">
      <p class="ma0 f7 fw3 tc">
        Created by <a href="https://twitter.com/libitx" class="link fw6 underline">Libs</a>.
        See <a href="https://github.com/libitx/brfcgen" class="link fw6 underline">source code</a>.
      </p>
    </footer>

  </div>

  <script>
    const enc = new TextEncoder()

    /**
     * BRFC ID Generator Alpine component
     */
    function brfcGen() {
      return {
        title: null,
        author: null,
        version: null,
        brfc: null,

        /**
         * Recalculates the BRFC ID
         */
        recalc(force = false) {
          if ((force || this.brfc) && this.payloadBuf().length > 0) {
            sha256x2(this.payloadBuf())
              .then(hash => [...new Uint8Array(hash)].slice(26).reverse())
              .then(brfc => this.brfc = toHex(brfc))
          }
        },

        /**
         * Concatenates attributes into ArrayBuffer
         */
        payloadBuf() {
          const str = (this.title || '').trim() +
                      (this.author || '').trim() +
                      (this.version || '').trim();
          return enc.encode(str)
        },

        /**
         * Fired when BRFC is changed
         */
        onChange(val) {
          const bg1 = val.substring(0, 6),
                bg2 = val.substring(6);
          document.body.style.setProperty('--bg1', '#'+bg1)
          document.body.style.setProperty('--bg2', '#'+bg2)
        }
      }
    }

    /**
     * Double sha256 hash
     */
    function sha256x2(buf) {
      return crypto.subtle.digest('SHA-256', buf)
        .then(hash => crypto.subtle.digest('SHA-256', hash))
    }

    /**
     * Encodes typed array as hex
     */
    function toHex(buf) {
      return [...new Uint8Array(buf)]
        .map(b => b.toString(16).padStart(2, '0'))
        .join('')
    }
  </script>

</body>
</html>