drawbridge/drawbridge_enroll.html at master · CoreInfraAI/drawbridge · 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" />
    <title>Drawbridge Enrollment</title>
    <style>
      body {
        max-width: 64rem;
      }

      label {
        display: block;
        margin-top: 1rem;
        margin-bottom: 0.25rem;
      }

      input {
        width: 20rem;
        padding: 0.25rem 0.5rem;
      }

      pre {
        min-width: 20rem;
        padding: 0.25rem 0.5rem;
        outline: thin dotted gray;
        overflow: auto;
      }
    </style>
  </head>
  <body>
    <h1>Drawbridge Enrollment</h1>
    <p>
      This creates a new WebAuthn credential in your authenticator. After
      creation, you’ll get an enrollment blob to send to your administrator.
    </p>

    <form id="enrollForm">
      <p>
        <label for="displayname">Name:</label>
        <input
          id="displayname"
          autocomplete="name"
          placeholder="Alice B. Carroll"
          required
        />
      </p>

      <p>
        <label for="email">Email:</label>
        <input
          id="email"
          type="email"
          autocomplete="email"
          placeholder="alice@example.com"
          required
        />
      </p>

      <p>
        <button id="enroll" type="submit">Create credential</button>
      </p>
    </form>

    <div id="result" hidden>
      <p>Copy and send this to your administrator:</p>
      <pre id="blob"></pre>
      <button id="copy">Copy</button>
    </div>

    <script>
      const $ = (id) => document.getElementById(id);

      function base64Encode(buf) {
        const bytes = new Uint8Array(buf);
        let s = "";
        for (const b of bytes) s += String.fromCharCode(b);
        return btoa(s);
      }

      function base64Decode(s) {
        const bin = atob(s);
        const out = new Uint8Array(bin.length);
        for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
        return out.buffer;
      }

      async function postJSON(url, body) {
        console.log(`> ${url}`, body);
        const res = await fetch(url, {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(body),
        });
        if (!res.ok) {
          throw new Error(`HTTP ${res.status} from ${url}`);
        }
        let resp = await res.json();
        console.log(`< ${url}`, resp);
        return resp;
      }

      $("copy").addEventListener("click", async () => {
        await navigator.clipboard.writeText($("blob").textContent);
      });

      $("enrollForm").addEventListener("submit", async (e) => {
        e.preventDefault();
        if (!window.PublicKeyCredential) {
          window.alert("WebAuthn not supported in this browser.");
          return;
        }

        const email = $("email").value.trim();
        const displayname = $("displayname").value.trim();
        if (!email) {
          window.alert("Email is required.");
          return;
        }
        if (!displayname) {
          window.alert("Name is required.");
          return;
        }

        try {
          $("enroll").disabled = true;
          const beginPayload = {
            username: email,
            displayname,
          };
          const options = await postJSON("/attestation/begin", beginPayload);
          options.challenge = base64Decode(options.challenge);
          options.user.id = base64Decode(options.user.id);
          if (Array.isArray(options.excludeCredentials)) {
            for (const c of options.excludeCredentials) {
              c.id = base64Decode(c.id);
            }
          }

          const createParams = {
            publicKey: options,
          };
          const cred = await navigator.credentials.create(createParams);
          if (!cred) {
            throw new Error("navigator.credentials.create() returned null");
          }

          const finishPayload = {
            attestationObject: base64Encode(cred.response.attestationObject),
            clientDataJSON: base64Encode(cred.response.clientDataJSON),
          };
          const blob = await postJSON("/attestation/finish", finishPayload);

          $("result").removeAttribute("hidden");
          $("blob").textContent = JSON.stringify(blob, null, 2);
        } catch (e) {
          const msg = String(e && e.message ? e.message : e);
          window.alert(msg);
        } finally {
          $("enroll").disabled = false;
        }
      });
    </script>
  </body>
</html>