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January 9, 2020 03:13
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25_twitter.js
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import AWS from 'aws-sdk'; | |
import request from 'request-promise'; | |
import { recognizeImage } from './image'; | |
const { BUCKET = '' } = process.env; | |
const SEPARATOR = '_-_'; | |
const s3 = new AWS.S3(); | |
const TWITTER_STATUS_URL = 'https://api.twitter.com/1.1/statuses/update.json'; | |
const { | |
TWITTER_ACCESS_TOKEN = '', | |
TWITTER_ACCESS_TOKEN_SECRET = '', | |
TWITTER_CONSUMER_API_KEY = '', | |
TWITTER_CONSUMER_API_KEY_SECRET = '', | |
} = process.env; | |
const oauth = { | |
consumer_key: TWITTER_CONSUMER_API_KEY, | |
consumer_secret: TWITTER_CONSUMER_API_KEY_SECRET, | |
token: TWITTER_ACCESS_TOKEN, | |
token_secret: TWITTER_ACCESS_TOKEN_SECRET, | |
}; | |
const TWEET_CHARACTER_LIMIT = 240; | |
const parseTweet = tweet => { | |
const tweetData = tweet.tweet_create_events; | |
if (typeof tweetData === 'undefined' || tweetData.length < 1) { | |
console.log('Not a new tweet event', tweetData); | |
return false; | |
} | |
const { | |
id_str: tweetId = '', | |
user: { id_str: userId = '', screen_name: screenName = '' } = {}, | |
entities: { media = {} } = {}, | |
} = tweetData[0]; | |
if (!media || !media.length) { | |
return false; | |
} | |
const { media_url: mediaUrl = '', type = '' } = media[0]; | |
console.log('parsed tweet data: %j', { tweetId, userId, screenName, mediaUrl, type }); | |
return { tweetId, userId, screenName, mediaUrl, type }; | |
}; | |
export const uploadImage = async (imageUrl, meta) => { | |
const options = { uri: imageUrl, encoding: null }; | |
const mediaResponse = await request(options); | |
const params = { | |
Bucket: meta.bucket, | |
Key: meta.key, | |
Body: mediaResponse, | |
}; | |
try { | |
const uploadedImage = await s3.putObject(params).promise(); | |
console.log(uploadedImage, 'Image uploaded.'); | |
} catch (err) { | |
console.log('Failure uploading image to S3', err); | |
} | |
}; | |
export const processTweet = async event => { | |
try { | |
const tweet = JSON.parse(event.body); | |
console.log('incoming tweet', tweet); | |
const parsedTweet = parseTweet(tweet); | |
if (!parsedTweet) { | |
return true; | |
} | |
const { tweetId = '', userId = '', screenName = '', mediaUrl = '', type = '' } = parsedTweet; | |
console.log('processTweet', { tweetId, userId, screenName, mediaUrl, type }); | |
if (!mediaUrl || type !== 'photo') { | |
return true; // don't do anything | |
} | |
const extension = mediaUrl.split('.').pop(); | |
const key = `${screenName}${SEPARATOR}${tweetId}${SEPARATOR}${Date.now()}.${extension}`; | |
console.log('Saving image to s3 bucket at: ', key); | |
await uploadImage(mediaUrl, { | |
bucket: BUCKET, | |
key, | |
}); | |
return true; | |
} catch (e) { | |
console.log('process tweet err', e); | |
return false; | |
} | |
}; | |
const splitTweet = (heading, labelMessage, celebMessage) => { | |
const split = `${heading}${labelMessage}${celebMessage}`.split('\n'); | |
const chunks = []; | |
let currentChunk = ''; | |
for (const chunk of split) { | |
if (currentChunk.length + chunk.length > TWEET_CHARACTER_LIMIT) { | |
chunks.push(currentChunk); | |
currentChunk = chunk; | |
} else { | |
currentChunk = currentChunk.concat(`\n${chunk}`); | |
} | |
} | |
if (currentChunk !== '') { | |
chunks.push(currentChunk); | |
} | |
return chunks; | |
}; | |
const createTweet = async (status, tweetId) => { | |
const requestOptions = { | |
url: TWITTER_STATUS_URL, | |
oauth, | |
headers: { | |
'Content-type': 'application/x-www-form-urlencoded', | |
}, | |
form: { | |
status, | |
in_reply_to_status_id: tweetId, | |
auto_populate_reply_metadata: true, | |
}, | |
resolveWithFullResponse: true, | |
}; | |
try { | |
const response = await request.post(requestOptions); | |
console.log('createTweet', response.body); | |
return true; | |
} catch (e) { | |
console.log('create tweet err', e.message); | |
return false; | |
} | |
}; | |
export const composeTweet = (username, labels = [], celebrities = []) => { | |
let heading = `Hi @${username}, I like your image. \n`; | |
let labelMessage = ``; | |
let celebMessage = ``; | |
if (labels.length + celebrities.length === 0) { | |
heading += "I can't recognize anything in the image though..."; | |
} else { | |
if (labels.length) { | |
labelMessage += `I recognize some things in this image: ${labels.map(l => l.Name || 'something').join(', ')}\n`; | |
} | |
if (celebrities.length) { | |
const celebFormatter = c => `${c.name} (${c.url}) `; | |
celebMessage += `I see some celebs, too: ${celebrities.map(celebFormatter).join('\n')}`; | |
} | |
} | |
return { heading, labelMessage, celebMessage }; | |
}; | |
export const respondToImageTweet = async event => { | |
try { | |
const { s3 } = event.Records[0]; | |
const [screenName, tweetId] = s3.object.key.split(SEPARATOR); | |
const { labels, celebrities } = await recognizeImage(s3); | |
console.log('image contents', { labels, celebrities }); | |
const { heading, labelMessage, celebMessage } = composeTweet(screenName, labels, celebrities); | |
const tweetLength = heading.length + labelMessage.length + celebMessage.length; | |
if (tweetLength > TWEET_CHARACTER_LIMIT) { | |
const tweetChunks = splitTweet(heading, labelMessage, celebMessage); | |
console.log('tweetChunks', tweetChunks); | |
const createTweetPromises = tweetChunks.map(chunk => createTweet(chunk, tweetId)); | |
await Promise.all(createTweetPromises); | |
} else { | |
const message = `${heading}${labelMessage}${celebMessage}`; | |
await createTweet(message, tweetId); | |
console.log('respond to image tweet', message); | |
} | |
return true; | |
} catch (e) { | |
console.log('respond to tweet err', e.message); | |
return false; | |
} | |
}; |
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