Twitter BOT to send joke and image (lambda + typescript)

npm install -g serverless

sls create --template aws-nodejs-typescript

npm install --save axios twitter-api-client
npm install --save-dev serverless-offline

import type { AWS } from '@serverless/typescript';

const serverlessConfiguration: AWS = {
  service: 'twitter-bot',
  frameworkVersion: '2',
  custom: {
    webpack: {
      webpackConfig: './webpack.config.js',
      includeModules: true
    }
  },
  // Add the serverless-webpack plugin
  plugins: ['serverless-webpack', 'serverless-offline'],
  provider: {
    name: 'aws',
    runtime: 'nodejs14.x',
    apiGateway: {
      minimumCompressionSize: 1024,
    },
    environment: {
      AWS_NODEJS_CONNECTION_REUSE_ENABLED: '1',
    },
  },
  functions: {
    twitterJokesBot: {
      handler: 'handler.twitterJokesBot',
      events: [
        {
          http: {
            method: 'get',
            path: 'twitterJokesBot',
          }
        }
      ]
    }
  }
}

module.exports = serverlessConfiguration;

import { TwitterClient } from 'twitter-api-client';

export const twitterClient = new TwitterClient({
    apiKey: process.env.TWITTER_API_KEY,
    apiSecret: process.env.TWITTER_API_SECRET,
    accessToken: process.env.TWITTER_ACCESS_TOKEN,
    accessTokenSecret: process.env.TWITTER_ACCESS_SECRET,
});

import Axios, { AxiosResponse } from "axios";

/**
 * Get a joke from jokeapi.dev. If the length of tweet string is greater than 280 character then recurse till you find one.
 * @returns string
 */
export const getJokeTweet = async () => {
  //List of hashtags for the tweet
  const hashTags =
    "@metacollective9 #jokes #javascript #programming #dev #linux #java #programming #python #reactjs #DataScience #infosec #gamedev #BigData #serverless";

  const footerText = "From https://jokeapi.dev";

  //Get a random joke from jokeapi
  let joke: AxiosResponse = await Axios.get(
    "https://v2.jokeapi.dev/joke/Programming?blacklistFlags=nsfw,religious,political,racist,sexist,explicit&type=single"
  );

  // \n will add line breaks to the tweet
  const tweet = `${joke.data.joke} \n\n ${hashTags} \n\n ${footerText}`;

  console.log(tweet.length);

  if (tweet.length <= 280) {
    return tweet;
  }

   return await getJokeTweet();

};

/**
 * Get a gif image from giphy.com
 * @returns image buffer
 */
export const getJokeImage = async () => {
  //get a giphy to go with this joke
  let giphy: AxiosResponse = await Axios.get(
    `https://api.giphy.com/v1/gifs/random?api_key=${process.env.GIPHY_API_KEY}&tag=bad+joke&rating=g`
  );

  //Get that giphy image as a buffer.
  const image: AxiosResponse = await Axios.get(giphy?.data.data.images.downsized_medium.url, {
    responseType: "arraybuffer",
  });

  return image;
};

import { APIGatewayProxyHandler } from "aws-lambda";
import "source-map-support/register";
import { twitterClient } from "./src/util/twitterApiClient";
import { getJokeImage, getJokeTweet } from "./src/util/joke";
import { AxiosResponse } from "axios";
import { MediaUpload } from "twitter-api-client";
export const twitterJokesBot: APIGatewayProxyHandler = async (_event, _context) => {
  let tweet: string = "";

  try {
    //get Joke
    tweet = await getJokeTweet();

    const image: AxiosResponse = await getJokeImage();

    //Upload media to twitter
    const media: MediaUpload = await twitterClient.media.mediaUpload({
      media: Buffer.from(image.data, "binary").toString("base64"),
    });

    //Send a tweet with joke and media
    await twitterClient.tweets.statusesUpdate({
      status: tweet,
      media_ids: media.media_id_string, 
    });
  } catch (error) {
    console.log(error);
  }

  return {
    statusCode: 200,
    body: JSON.stringify(
      {
        joke: tweet,
        length: tweet.length
      },
      null,
      2
    ),
  };
};