CloudFront 中的 AWS Lambda@Edge 502 LambdaValidationError 用于重定向

Question

我有一个 lambda 函数，如果它有使用正则表达式生成的 uri，它会执行 301 重定向。

const redirects = {
    xyz: '/contact',
    abc: '/about',
};

const arrRegex = [
    { regex: /\xyz/\faq/\max, redirect: redirects.xyz },
    { regex: /\abc/\faq/\min, redirect: redirects.abc },
    { regex: /\lmn\?page=[1-9]/, redirectNotNeeded }
];

function redirect(request) {
    
    let requests = request.uri;
    let finalUrl = '';

    arrRegex.some(reg => {
        const re = new RegExp(reg.regex);
        if (requests.match(re) && reg.redirectNotNeeded) {
            finalUrl = request;
            return true;
        } else if (requests.match(re) && reg.redirect) {
            finalUrl = reg.redirect;
            return true;
        } else {
            return requests.match(re) && !reg.redirect;
        }
    });
    return finalUrl;
}

exports.handler = (event, context, callback) => {
    
    // find request URL
    const request = event.Records[0].cf.request;
    request.uri = redirect(request);

    
    let prefixPath; // needed for 2nd condition

    if (request.uri.match('.+/$')) {
    request.uri += 'index.html';
    callback(null, request);
    } else if (prefixPath = request.uri.match('(.+)/index.html')) {
    const response = {
      status: '301',
      statusDescription: 'Found',
      headers: {
        location: [{
          key: 'Location', value: prefixPath[1] + '/',
        }],
      }
    };
    callback(null, response);
    } else if (request.uri.match('/[^/.]+$')) {
    const response = {
      status: '301',
      statusDescription: 'Found',
      headers: {
        location: [{
          key: 'Location', value: request.uri + '/',
        }],
      }
    };
    callback(null, response);
    } else {
    callback(null, request);
    }
};

在部署函数并将其添加到云端行为时，当我转到 url https:my-website/xyz/faq/max 时，即使我看到 301 的状态 https:my-website/xyz/faq/max ] 正确重新路由到 https:my-website/contact 后，显示 502 错误。 https:my-website 也显示相同的错误。在 chrome 状态下，我在 Response Header 下看到 LambdaValidationError from cloudfront。我可以知道我在这里做错了什么来抛出这个错误吗？这些页面只是存储在使用 Amazon CloudFront 提供服务的 AWS S3 存储桶中的静态页面。

Answer 1

将 let finalUrl = ''; 更改为 let finalUrl = request.uri; 帮助我摆脱了错误，因为我将其设置为空字符串，lambda 抛出 502 错误，因为它无法 re-direct请求中没有uri时的流量。

const redirects = {
    xyz: '/contact',
    abc: '/about',
};

const arrRegex = [
    { regex: /\xyz/\faq/\max, redirect: redirects.xyz },
    { regex: /\abc/\faq/\min, redirect: redirects.abc },
    { regex: /\lmn\?page=[1-9]/, redirectNotNeeded }
];

function redirect(request) {
    
    let requests = request.uri;
    let finalUrl = request.uri;

    arrRegex.some(reg => {
        const re = new RegExp(reg.regex);
        if (requests.match(re) && reg.redirectNotNeeded) {
            finalUrl = request;
            return true;
        } else if (requests.match(re) && reg.redirect) {
            finalUrl = reg.redirect;
            return true;
        } else {
            return requests.match(re) && !reg.redirect;
        }
    });
    return finalUrl;
}

exports.handler = (event, context, callback) => {
    
    // find request URL
    const request = event.Records[0].cf.request;
    request.uri = redirect(request);

    
    let prefixPath; // needed for 2nd condition

    if (request.uri.match('.+/$')) {
    request.uri += 'index.html';
    callback(null, request);
    } else if (prefixPath = request.uri.match('(.+)/index.html')) {
    const response = {
      status: '301',
      statusDescription: 'Found',
      headers: {
        location: [{
          key: 'Location', value: prefixPath[1] + '/',
        }],
      }
    };
    callback(null, response);
    } else if (request.uri.match('/[^/.]+$')) {
    const response = {
      status: '301',
      statusDescription: 'Found',
      headers: {
        location: [{
          key: 'Location', value: request.uri + '/',
        }],
      }
    };
    callback(null, response);
    } else {
    callback(null, request);
    }
};

CloudFront 中的 AWS Lambda@Edge 502 LambdaValidationError 用于重定向

AWS Lambda@Edge 502 LambdaValidationError in CloudFront for redirect

javascript

amazon-cloudfront

aws-lambda

aws-lambda-edge