【ハンズオン】Lambda プロキシ統合を使用した Hello World REST API の構築

'use strict';
console.log('Loading hello world function');
 
export const handler = async (event) => {
    let name = "you";
    let city = 'World';
    let time = 'day';
    let day = '';
    let responseCode = 200;
    console.log("request: " + JSON.stringify(event));
    
    if (event.queryStringParameters && event.queryStringParameters.name) {
        console.log("Received name: " + event.queryStringParameters.name);
        name = event.queryStringParameters.name;
    }
    
    if (event.queryStringParameters && event.queryStringParameters.city) {
        console.log("Received city: " + event.queryStringParameters.city);
        city = event.queryStringParameters.city;
    }
    
    if (event.headers && event.headers['day']) {
        console.log("Received day: " + event.headers.day);
        day = event.headers.day;
    }
    
    if (event.body) {
        let body = JSON.parse(event.body)
        if (body.time) 
            time = body.time;
    }
 
    let greeting = `Good ${time}, ${name} of ${city}.`;
    if (day) greeting += ` Happy ${day}!`;

    let responseBody = {
        message: greeting,
        input: event
    };
    
    // The output from a Lambda proxy integration must be 
    // in the following JSON object. The 'headers' property 
    // is for custom response headers in addition to standard 
    // ones. The 'body' property  must be a JSON string. For 
    // base64-encoded payload, you must also set the 'isBase64Encoded'
    // property to 'true'.
    let response = {
        statusCode: responseCode,
        headers: {
            "x-custom-header" : "my custom header value"
        },
        body: JSON.stringify(responseBody)
    };
    console.log("response: " + JSON.stringify(response))
    return response;
};

https://171rkafwuj.execute-api.ap-northeast-1.amazonaws.com/test/helloworld?name=yasushi&city=osushi

curl -v -X POST \
  'https://171rkafwuj.execute-api.ap-northeast-1.amazonaws.com/test/helloworld?name=yasushi&city=osushi' \
  -H 'content-type: application/json' \
  -H 'day: Thursday' \
  -d '{ "time": "evening" }'

{
    "message": "Good evening, yasushi of osushi. Happy Thursday!",
    "input": {
        "resource": "/helloworld",
        "path": "/helloworld",
        "httpMethod": "POST",
        "headers": {
            "Accept": "*/*",
            "Accept-Encoding": "gzip, deflate, br",
            "Cache-Control": "no-cache",
            "Content-Type": "application/json",
            "day": "Thursday",
            "Host": "171rkafwuj.execute-api.ap-northeast-1.amazonaws.com",
            "Postman-Token": "12345678-1234-1234-1234-1234567890",
            "User-Agent": "PostmanRuntime/7.32.3",
            "X-Amzn-Trace-Id": "Root=1-23456789-12345678901234567890123456789",
            "X-Forwarded-For": "54.86.50.139",
            "X-Forwarded-Port": "443",
            "X-Forwarded-Proto": "https"
        },
        "multiValueHeaders": {
            "Accept": [
                "*/*"
            ],
            "Accept-Encoding": [
                "gzip, deflate, br"
            ],
            "Cache-Control": [
                "no-cache"
            ],
            "Content-Type": [
                "application/json"
            ],
            "day": [
                "Thursday"
            ],
            "Host": [
                "171rkafwuj.execute-api.ap-northeast-1.amazonaws.com"
            ],
            "Postman-Token": [
                "12345678-1234-1234-1234-1234567890"
            ],
            "User-Agent": [
                "PostmanRuntime/7.32.3"
            ],
            "X-Amzn-Trace-Id": [
                "Root=1-23456789-12345678901234567890123456789"
            ],
            "X-Forwarded-For": [
                "54.86.50.139"
            ],
            "X-Forwarded-Port": [
                "443"
            ],
            "X-Forwarded-Proto": [
                "https"
            ]
        },
        "queryStringParameters": {
            "city": "osushi",
            "name": "yasushi"
        },
        "multiValueQueryStringParameters": {
            "city": [
                "osushi"
            ],
            "name": [
                "yasushi"
            ]
        },
        "pathParameters": null,
        "stageVariables": null,
        "requestContext": {
            "resourceId": "aaaaaa",
            "resourcePath": "/helloworld",
            "httpMethod": "POST",
            "extendedRequestId": "aaaaaaaaaaaaaaa=",
            "requestTime": "16/Aug/2023:01:47:40 +0000",
            "path": "/test/helloworld",
            "accountId": "123456789012",
            "protocol": "HTTP/1.1",
            "stage": "test",
            "domainPrefix": "171rkafwuj",
            "requestTimeEpoch": 1234567890123,
            "requestId": "test-invoke-request",
            "identity": {
                "cognitoIdentityPoolId": null,
                "accountId": null,
                "cognitoIdentityId": null,
                "caller": null,
                "sourceIp": "54.86.50.139",
                "principalOrgId": null,
                "accessKey": null,
                "cognitoAuthenticationType": null,
                "cognitoAuthenticationProvider": null,
                "userArn": null,
                "userAgent": "PostmanRuntime/7.32.3",
                "user": null
            },
            "domainName": "171rkafwuj.execute-api.ap-northeast-1.amazonaws.com",
            "apiId": "171rkafwuj"
        },
        "body": "{ \"time\": \"evening\" }",
        "isBase64Encoded": false
    }
}

https://171rkafwuj.execute-api.ap-northeast-1.amazonaws.com/test/helloworld?name=yasushi&city=osushi

{ 
  "time": "evening",
  "name": "yasushi",
  "city": "osushi"
}

"message":"Good evening, you of World."

name=yasushi&city=osushi