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carbon/handlers/twitter.js

65 lines
1.9 KiB
JavaScript

const Twitter = require('twit')
const morph = require('morphmorph')
const RATE_LIMIT_CODE = 420
const MAX_ALT_TEXT_LENGTH = 420
const client = new Twitter({
consumer_key: process.env.TWITTER_CONSUMER_KEY,
consumer_secret: process.env.TWITTER_CONSUMER_SECRET,
access_token: process.env.TWITTER_ACCESS_TOKEN_KEY,
access_token_secret: process.env.TWITTER_ACCESS_TOKEN_SECRET
})
const extractMediaId = morph.get('data.media_id_string')
const extractImageUrl = morph.get('data.entities.media.0.display_url')
const extractErrorCode = morph.get('0.code')
const uploadImage = data => client.post('media/upload', { media_data: data })
const uploadMetadata = (altText, twitterRes = {}) => {
if (!altText)
return twitterRes
const formattedAltText = altText.length > MAX_ALT_TEXT_LENGTH
? `${altText.slice(0, MAX_ALT_TEXT_LENGTH - 3)}...`
: altText
return client
.post('media/metadata/create', {
media_id: extractMediaId(twitterRes),
alt_text: { text: formattedAltText }
})
.then(() => twitterRes)
}
const uploadTweet = (twitterRes = {}) => client.post('statuses/update', {
status: `Carbon Copy #${extractMediaId(twitterRes).slice(0, 8)}`,
media_ids: extractMediaId(twitterRes)
})
const respondSuccess = (res, url) => res.json({ url })
const respondFail = (res, err) => {
const errorCode = extractErrorCode(err)
// check for rate limit
if (errorCode === RATE_LIMIT_CODE) {
return res.status(420).send()
}
// eslint-disable-next-line
console.error(`Error: ${err.message || JSON.stringify(err, null, 2)}`)
return res.status(500).send()
}
module.exports = (req, res) => {
if (!req.body.imageData) {
return res.status(400).send()
}
return uploadImage(req.body.imageData)
.then(uploadMetadata.bind(null, req.body.altText))
.then(uploadTweet)
.then(extractImageUrl)
.then(respondSuccess.bind(null, res))
.catch(respondFail.bind(null, res))
}