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handler.js
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handler.js
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'use strict';
require('dotenv').config();
const crypto = require('crypto');
const { getViolationData, getDataByYear } = require('./open-baltimore');
const {
generateNoViolationsTweet,
generateAnnualSummaryTweets,
generateViolationSummaries,
generateViolationTweets,
matchLicensePlates
} = require('./text-parsing');
const { publishTweet } = require('./twitter');
module.exports = {
twitterWebhook,
crcResponse
};
async function twitterWebhook(event) {
if (!verifySignature(event)) {
return {
statusCode: 401
};
}
console.log('event', event);
const body = JSON.parse(event.body);
console.log('body', body);
if (respondToTweet(body)) {
console.log('extended_tweet', body.tweet_create_events[0].extended_tweet);
console.log('entities', body.tweet_create_events[0].entities);
const mention = body.tweet_create_events[0];
let tweetText;
if (mention.extended_tweet && mention.extended_tweet.full_text) {
tweetText = mention.extended_tweet.full_text;
} else {
tweetText = mention.text;
}
const plateMatches = matchLicensePlates(tweetText);
console.log('plateMatches', plateMatches);
await Promise.all(plateMatches.map(async ([state, tag]) => {
console.log(state, tag);
try {
const mentionId = mention.id_str;
let tweets = [];
const violationData = await getViolationData(state, tag);
if (violationData.length > 0) {
const violations = generateViolationSummaries(violationData);
const violationTweets = generateViolationTweets(state, tag, violations);
// annual summary data
const annualSummaryData = await getDataByYear(state, tag);
const annualSummaryTweets = generateAnnualSummaryTweets(state, tag, annualSummaryData);
// put all the tweets together
tweets = [ ...violationTweets, ...annualSummaryTweets ];
} else {
tweets = generateNoViolationsTweet(state, tag);
}
// start with replying to original tweet,
// and update this value for each subsequent tweet
let replyToId = mentionId;
const tweetsAsyncIterable = {
[Symbol.asyncIterator]() {
return {
next() {
if (tweets.length) {
return publishTweet(tweets.shift(), replyToId);
} else {
return Promise.resolve({done: true});
}
}
};
}
};
for await (let id_str of tweetsAsyncIterable) {
replyToId = id_str;
}
return Promise.resolve();
} catch (err) {
console.error(err);
return Promise.reject(err);
}
}));
return { statusCode: 200, body: '' };
}
}
async function crcResponse(event) {
const { crc_token } = event.queryStringParameters;
const response_token = 'sha256=' + crypto.createHmac('sha256', process.env.TWITTER_CONSUMER_SECRET).update(crc_token).digest('base64');
return {
statusCode: 200,
body: JSON.stringify({ response_token })
};
}
function respondToTweet(tweet) {
if (
Object.prototype.hasOwnProperty.call(tweet, 'user_has_blocked') &&
Object.prototype.hasOwnProperty.call(tweet, 'tweet_create_events') &&
tweet.tweet_create_events.length >= 1
) {
return true;
} else {
return false;
}
}
function verifySignature(event) {
const signature = event.headers['X-Twitter-Webhooks-Signature'];
const body = event.body;
const hmac = 'sha256=' + crypto.createHmac('sha256', process.env.TWITTER_CONSUMER_SECRET).update(body).digest('base64');
return signature === hmac;
}