在Chrome OS上实现WebAuthn

WebAuthn是一个标准，用于在Web上实现强大的身份验证。Chrome OS支持WebAuthn身份验证，本示例代码演示了如何在Chrome OS上使用WebAuthn进行身份验证的实现方式。

async function handleWebAuthn(event) {
  // 检查是否支持WebAuthn
  if (!navigator.credentials || !navigator.credentials.create) {
    console.error('WebAuthn not supported');
    return;
  }

  try {
    // 创建公钥凭证
    const publicKey = {
      challenge: stringToArrayBuffer(event.challenge),
      rp: {
        id: event.rpId,
        name: 'Example Inc'
      },
      user: {
        id: stringToArrayBuffer(event.userId),
        name: 'user@example.com',
        displayName: 'User'
      },
      pubKeyCredParams: [
        {
          alg: -7,
          type: 'public-key'
        }
      ]
    };

    // 获取凭证
    const credential = await navigator.credentials.create({
      publicKey
    });

    // 进行身份验证
    const response = await fetch('/login', {
      method: 'POST',
      body: JSON.stringify({
        id: credential.id,
        rawId: arrayBufferToString(response.rawId),
        type: credential.type,
        response: {
          clientDataJSON: arrayBufferToString(credential.response.clientDataJSON),
          authenticatorData: arrayBufferToString(credential.response.authenticatorData),
          signature: arrayBufferToString(credential.response.signature),
          userHandle: arrayBufferToString(credential.response.userHandle)
        }
      })
    });
  } catch (error) {
    console.error(error);
  }
}

function stringToArrayBuffer(string) {
  const encoder = new TextEncoder();
  return encoder.encode(string);
}

function arrayBufferToString(buffer) {
  const decoder = new TextDecoder();
  return decoder.decode(buffer);
}

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