AWS LambdaがHTTPSエンドポイント対応したのでCDKを使ってオウム返しのLINE botを作ってみる

mkdir lambda-line-bot
cd lambda-line-bot
npx cdk init --language typescript

mkdir -p lambda/testParrotFashion/src
cd lambda/testParrotFashion
npm install typescript --save-dev
npm install --save-dev @types/aws-lambda
npx tsc --init --rootDir src --outDir build --esModuleInterop --resolveJsonModule --lib esnext --module commonjs

import * as Line from "@line/bot-sdk";
import { WebhookEvent } from "@line/bot-sdk";
import { APIGatewayEvent } from "aws-lambda";
const accessToken = process.env.ACCESS_TOKEN!;
const channelSecret = process.env.CHANNEL_SECRET!;

const config: Line.ClientConfig = {
  channelAccessToken: accessToken,
  channelSecret: channelSecret,
};

const client = new Line.Client(config);

exports.handler = async (event: APIGatewayEvent) => {
  const body: Line.WebhookRequestBody = JSON.parse(event.body!);
  try {
    await Promise.all(
      body.events.map(async (e: WebhookEvent) => {
        if (e.type !== "message" || e.message.type !== "text") {
          return null;
        }
        const message: Line.Message = { type: "text", text: e.message.text };
        await client.replyMessage(e.replyToken, message);
      })
    );
    return {
      statusCode: 200,
      body: JSON.stringify("SUCCESS"),
    };
  } catch (error) {
    return {
      statusCode: 400,
      body: "FAILED",
    };
  }
};

import { Stack, StackProps } from "aws-cdk-lib";
import { Construct } from "constructs";
import { NodejsFunction } from "aws-cdk-lib/aws-lambda-nodejs";

interface LambdaLineBotStackProps extends StackProps {
  channelAccessToken: string;
  channelSecret: string;
}
export class LambdaLineBotStack extends Stack {
  constructor(scope: Construct, id: string, props: LambdaLineBotStackProps) {
    super(scope, id, props);

    const lamdba = new NodejsFunction(this, "testParrotFashionFunction", {
      entry: "./lambda/testParrotFashion/src/index.ts",
      handler: "handler",
      environment: {
        ACCESS_TOKEN: props.channelAccessToken,
        CHANNEL_SECRET: props.channelSecret,
      },
    });
  }
}

#!/usr/bin/env node
import "source-map-support/register";
import * as cdk from "aws-cdk-lib";
import { LambdaLineBotStack } from "../lib/lambda-line-bot-stack";

const app = new cdk.App();
const accessToken = app.node.tryGetContext("ACCESS_TOKEN");
const channelSecret = app.node.tryGetContext("CHANNEL_SECRET");

new LambdaLineBotStack(app, "LambdaLineBotStack", {
  channelAccessToken: accessToken,
  channelSecret: channelSecret,

});

CHANNEL_SERCRET="XXXXXXXXXXXXXXXXXXXXXX"
ACCESS_TOKEN="YYYYYYYYYYYYYYYYYYYYYYYY"

npx cdk deploy LambdaLineBotStack --context CHANNEL_SECRET=$CHANNEL_SECRET --context ACCESS_TOKEN=$ACCESS_TOKEN