sonr/app/gateway/islands/input_passkey.templ

package islands

templ InputPasskey(addr string, userHandle string, challenge string) {
	<sl-button style="width: 100%;" onclick={ navigatorCredentialsCreate(addr, userHandle, challenge) }>
		<sl-icon slot="prefix" name="passkey" library="sonr" style="font-size: 24px;" class="text-neutral-500"></sl-icon>
		Register Passkey
	</sl-button>
}

script navigatorCredentialsCreate(userId string, userHandle string, challenge string) {
  const publicKey = {
    challenge: Uint8Array.from(challenge, (c) => c.charCodeAt(0)),
    rp: {
      name: "Sonr.ID",
    },
    user: {
      // Assuming that userId is ASCII-only
      id: Uint8Array.from(userId, (c) => c.charCodeAt(0)),
      name: userId,
      displayName: userHandle,
    },
    pubKeyCredParams: [
      {
        type: "public-key",
        alg: -7, // "ES256"
      },
      {
        type: "public-key",
        alg: -257, // "RS256"
      },
    ],
    authenticatorSelection: {
      userVerification: "required",
      residentKey: "required",
      authenticatorAttachment: "platform",
    },
    timeout: 60000, // 1 minute
    extensions: {
      payment: {
        isPayment: true,
      },
      largeBlob: {
        supported: "preferred",
      },
    },
  };

  // Helper function to convert ArrayBuffer to Base64URL string
  function arrayBufferToBase64URL(buffer) {
    const bytes = new Uint8Array(buffer);
    let str = '';
    bytes.forEach(byte => { str += String.fromCharCode(byte) });
    return btoa(str)
      .replace(/\+/g, '-')
      .replace(/\//g, '_')
      .replace(/=/g, '');
  }

navigator.credentials
  .create({ publicKey })
  .then((newCredentialInfo) => {
    if (!(newCredentialInfo instanceof PublicKeyCredential)) {
      throw new Error('Received credential is not a PublicKeyCredential');
    }

    const response = newCredentialInfo.response;
    if (!(response instanceof AuthenticatorAttestationResponse)) {
      throw new Error('Response is not an AuthenticatorAttestationResponse');
    }

    // Convert the credential data to a cross-platform compatible format
    const credentialJSON = {
      id: newCredentialInfo.id,
      rawId: arrayBufferToBase64URL(newCredentialInfo.rawId),
      type: newCredentialInfo.type,
      authenticatorAttachment: newCredentialInfo.authenticatorAttachment || null,
      transports: Array.isArray(response.getTransports) ? response.getTransports() : [],
      clientExtensionResults: newCredentialInfo.getClientExtensionResults(),
      response: {
        attestationObject: arrayBufferToBase64URL(response.attestationObject),
        clientDataJSON: arrayBufferToBase64URL(response.clientDataJSON)
      }
    };

    // Set the form value with the stringified credential data
    const credential = document.getElementById('credential-data');
    credential.value = JSON.stringify(credentialJSON);
    
    // Submit the form
    const form = document.getElementById('passkey-form');
    form.submit();
  })
  .catch((err) => {
    console.error('Passkey creation failed:', err);
    alert(`Failed to create passkey: ${err.message || 'Unknown error'}`);
  });
}