blocto-decode/index.html at main · findonflow/blocto-decode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Blocto Wallet Decrypt</title>
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <style>
    body { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; margin: 2rem; background: #0f172a; color: #e5e7eb; }
    .card { max-width: 520px; margin: 0 auto; padding: 1.75rem 2rem; border-radius: 0.9rem; background: radial-gradient(circle at top left, #1f2937, #020617 55%); box-shadow: 0 24px 60px rgba(15,23,42,0.9); border: 1px solid rgba(148,163,184,0.25); }
    h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
    p { font-size: 0.9rem; color: #9ca3af; margin-top: 0; }
    .subtitle { font-size: 0.85rem; color: #60a5fa; margin-top: 0.25rem; margin-bottom: 0.5rem; }
    label { display: block; font-size: 0.85rem; margin-top: 1rem; margin-bottom: 0.25rem; }
    input[type="file"], input[type="password"] { width: 100%; font-size: 0.9rem; padding: 0.6rem 0.7rem; border-radius: 0.5rem; border: 1px solid #374151; background: #020617; color: #e5e7eb; box-sizing: border-box; }
    input[type="file"] { padding: 0.3rem 0.1rem; background: transparent; border: none; }
    button { margin-top: 1.25rem; width: 100%; padding: 0.65rem 0.75rem; border-radius: 0.5rem; border: none; background: linear-gradient(to right, #4f46e5, #0ea5e9); color: white; font-weight: 600; font-size: 0.95rem; cursor: pointer; box-shadow: 0 10px 20px rgba(37,99,235,0.4); }
    button:disabled { opacity: 0.5; cursor: default; box-shadow: none; }
    .status { margin-top: 0.75rem; font-size: 0.85rem; min-height: 1.1em; }
    .status.error { color: #fca5a5; }
    .status.success { color: #6ee7b7; }
    .status-label { font-weight: 600; text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.08em; margin-right: 0.35rem; opacity: 0.8; }
    .steps { margin: 0.5rem 0 0.5rem; padding-left: 1.2rem; font-size: 0.82rem; color: #9ca3af; }
    .steps li { margin-bottom: 0.25rem; }
    .warning-box { margin-top: 1rem; padding: 0.6rem 0.7rem; border-radius: 0.6rem; background: rgba(127,29,29,0.2); border: 1px solid rgba(248,113,113,0.5); font-size: 0.8rem; color: #fecaca; }
    .warning-box strong { color: #fed7aa; }
    .copy-row { display: flex; justify-content: space-between; align-items: center; margin-top: 0.4rem; gap: 0.5rem; }
    .copy-row button { width: auto; padding-inline: 0.8rem; flex-shrink: 0; }
    textarea { margin-top: 0.75rem; width: 100%; min-height: 80px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 0.8rem; padding: 0.6rem 0.7rem; border-radius: 0.5rem; border: 1px solid #374151; background: #020617; color: #e5e7eb; resize: vertical; box-sizing: border-box; }
    small { font-size: 0.75rem; color: #6b7280; display: block; margin-top: 0.25rem; }
    footer { margin-top: 1.5rem; text-align: center; font-size: 0.75rem; color: #6b7280; }
    footer span { color: #e5e7eb; }
  </style>
  <!-- Ethers v6 UMD build -->
  <script src="https://cdn.jsdelivr.net/npm/ethers@6.13.4/dist/ethers.umd.min.js"></script>
  <!-- pdf.js for reading JSON embedded inside recovery PDFs -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
</head>
<body>
  <div class="card">
    <h1>Blocto Account Recovery</h1>
    <p class="subtitle">Move your Blocto account into non-custodial mode and import into a Flow-compatible wallet.</p>

    <p>Use this tool to decrypt your **Blocto recovery keystore** and reveal the underlying private key locally. You can then import that private key into a non-custodial Flow wallet.</p>

    <ol class="steps">
      <li><strong>Select your recovery file:</strong> choose your Blocto recovery <code>.json</code> keystore or recovery <code>.pdf</code>.</li>
      <li><strong>Enter your password:</strong> use the same password you used when the recovery file was created.</li>
      <li><strong>Decrypt and import:</strong> decrypt, copy the private key (without <code>0x</code>), and paste it into your Flow wallet.</li>
    </ol>

    <label for="jsonFile">Blocto recovery file (JSON or PDF)</label>
    <input id="jsonFile" type="file" accept="application/json,.json,application/pdf,.pdf" />

    <label for="password">Recovery password</label>
    <input id="password" type="password" autocomplete="off" />
    <small>Decryption is performed locally in your browser. Do not use this on a shared or untrusted device.</small>

    <button id="decryptBtn">Decrypt Wallet</button>

    <div id="status" class="status"></div>

    <label for="privateKey">Recovered private key (Flow)</label>
    <textarea id="privateKey" readonly placeholder="Decrypted private key (without 0x) will appear here"></textarea>

    <div class="copy-row" id="copyRow" style="display:none;">
      <small>Copy this value into your Flow wallet when importing as a private key.</small>
      <button id="copyBtn" type="button">Copy private key</button>
    </div>

    <div class="warning-box">
      <strong>Warning:</strong> Anyone with this private key can fully control your Flow account. Store it securely, and only paste it into wallets you trust. Close this page when you are done.
    </div>
  </div>

  <footer>
    <span>Lovingly created by Luke at Find Labs</span>
  </footer>

  <script>
    const fileInput = document.getElementById('jsonFile');
    const passwordInput = document.getElementById('password');
    const decryptBtn = document.getElementById('decryptBtn');
    const statusEl = document.getElementById('status');
    const pkTextarea = document.getElementById('privateKey');
    const copyRow = document.getElementById('copyRow');
    const copyBtn = document.getElementById('copyBtn');

    function setStatus(message, type) {
      statusEl.textContent = message || '';
      statusEl.className = 'status' + (type ? ' ' + type : '');
    }

    async function extractJsonFromPdf(file) {
      if (!window['pdfjsLib']) {
        throw new Error('PDF library not loaded');
      }

      const arrayBuffer = await file.arrayBuffer();
      const pdf = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;
      let fullText = '';

      for (let pageNum = 1; pageNum <= pdf.numPages; pageNum++) {
        const page = await pdf.getPage(pageNum);
        const textContent = await page.getTextContent();
        const pageText = textContent.items.map((item) => item.str).join(' ');
        fullText += ' ' + pageText;
      }

      const start = fullText.indexOf('{');
      const end = fullText.lastIndexOf('}');
      if (start === -1 || end === -1 || end <= start) {
        throw new Error('Could not locate JSON in PDF');
      }

      const candidate = fullText.slice(start, end + 1);
      try {
        JSON.parse(candidate);
      } catch (e) {
        throw new Error('Found text in PDF but it is not valid JSON');
      }

      return candidate;
    }

    decryptBtn.addEventListener('click', async () => {
      setStatus('', '');
      pkTextarea.value = '';

      const file = fileInput.files[0];
      const password = passwordInput.value;

      if (!file) {
        setStatus('Please select an encrypted JSON file or recovery PDF.', 'error');
        return;
      }
      if (!password) {
        setStatus('Please enter the wallet password.', 'error');
        return;
      }

      decryptBtn.disabled = true;
      setStatus('Reading file…', '');

      try {
        let json;
        const isPdf = file.type === 'application/pdf' || file.name.toLowerCase().endsWith('.pdf');

        if (isPdf) {
          setStatus('Extracting JSON from PDF…', '');
          json = await extractJsonFromPdf(file);
        } else {
          json = await file.text();
        }

        setStatus('Decrypting wallet…', '');
        const wallet = await ethers.Wallet.fromEncryptedJson(json, password);
        const pk = wallet.privateKey && wallet.privateKey.startsWith('0x')
          ? wallet.privateKey.slice(2)
          : wallet.privateKey;
        pkTextarea.value = pk;
        copyRow.style.display = 'flex';
        setStatus('Wallet decrypted successfully.', 'success');
      } catch (err) {
        console.error(err);
        setStatus('Failed to decrypt wallet: ' + (err && err.message ? err.message : String(err)), 'error');
      } finally {
        decryptBtn.disabled = false;
      }
    });

    passwordInput.addEventListener('keydown', (event) => {
      if (event.key === 'Enter') {
        event.preventDefault();
        decryptBtn.click();
      }
    });

    copyBtn.addEventListener('click', async () => {
      const value = pkTextarea.value.trim();
      if (!value) {
        copyRow.style.display = 'none';
        setStatus('Nothing to copy yet. Decrypt a key first.', 'error');
        return;
      }

      try {
        if (navigator.clipboard && navigator.clipboard.writeText) {
          await navigator.clipboard.writeText(value);
        } else {
          // Fallback for very old browsers
          pkTextarea.select();
          document.execCommand('copy');
        }
        setStatus('Private key copied to clipboard.', 'success');
      } catch (err) {
        console.error(err);
        setStatus('Failed to copy private key. You may need to copy it manually.', 'error');
      }
    });
  </script>
</body>
</html>