Lambda@Edge の index.html のリダイレクト

aws_labmda_indexhtml_redirect.js

'use strict';
// ref. https://qiita.com/GussieTech/items/3ae77dbcb1e79222a9bc
const SUFFIX = '/index.html';
const REGEX_SUFFIX_LESS = /\/[^/.]+$/;
const APPEND_TO_DIRS = 'index.html';
const REGEX_TRAILING_SLASH = /.+\/$/;
exports.handler = (event, context, callback) => {
    let request = event.Records[0].cf.request;
    const requestUri = request.uri
    if (requestUri.match(REGEX_SUFFIX_LESS)) {
        request.uri = requestUri + SUFFIX;
        // console.log(`requestUri: ${requestUri}`, `rewroteUri: ${request.uri}`)
        return callback(null, request);
    }
    if (requestUri.match(REGEX_TRAILING_SLASH)) {
        request.uri = requestUri + APPEND_TO_DIRS;
        // console.log(`requestUri: ${requestUri}`, `rewroteUri: ${request.uri}`)
        return callback(null, request);
    }
    // console.log(`requestUri: ${requestUri}`, `rewroteUri: ${request.uri}`)
    return callback(null, request);
};

test_event_sample1.json

{
  "Records": [
    {
      "cf": {
        "config": {
          "distributionId": "EXAMPLE"
        },
        "request": {
          "uri": "/hello/index.html",
          "method": "GET",
          "clientIp": "2001:cdba::3257:9652",
          "headers": {
            "host": [
              {
                "key": "Host",
                "value": "d123.cf.net"
              }
            ],
            "user-agent": [
              {
                "key": "User-Agent",
                "value": "Test Agent"
              }
            ],
            "user-name": [
              {
                "key": "User-Name",
                "value": "aws-cloudfront"
              }
            ]
          }
        }
      }
    }
  ]
}

test_event_sample2.json

{
  "Records": [
    {
      "cf": {
        "config": {
          "distributionId": "EXAMPLE"
        },
        "request": {
          "uri": "/hello",
          "method": "GET",
          "clientIp": "2001:cdba::3257:9652",
          "headers": {
            "host": [
              {
                "key": "Host",
                "value": "d123.cf.net"
              }
            ],
            "user-agent": [
              {
                "key": "User-Agent",
                "value": "Test Agent"
              }
            ],
            "user-name": [
              {
                "key": "User-Name",
                "value": "aws-cloudfront"
              }
            ]
          }
        }
      }
    }
  ]
}