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EventEmitter from 'events';\nimport bodyParser from 'body-parser';\nimport {Router} from 'express';\nimport Elements from './Elements.js';\nimport Buttons from './Buttons.js';\nimport fetch from './libs/fetch.js';\nimport _ from 'lodash';\n\nexport {Elements, Buttons};\n\nconst userCache = {};\n\nexport async function wait(time) {\n return new Promise(resolve => setTimeout(() => resolve(), time));\n}\n\nclass Bot extends EventEmitter {\n static Buttons = Buttons;\n static Elements = Elements;\n\n static wait = wait;\n\n constructor(token, verification, debug = false) {\n super();\n\n this._token = token;\n this._debug = debug;\n this._verification = verification;\n }\n\n async send(to, message) {\n if (this._debug) {\n console.log({recipient: {id: to}, message: message ? message.toJSON() : message});\n }\n\n try {\n await fetch('https://graph.facebook.com/v2.6/me/messages', {\n method: 'post',\n query: {access_token: this._token},\n body: {recipient: {id: to}, message}\n });\n } catch (e) {\n if (e.text) {\n let text = e.text;\n try {\n const err = JSON.parse(e.text).error;\n text = `${err.type || 'Unknown'}: ${err.message || 'No message'}`;\n } catch (ee) {\n // ignore\n }\n\n throw Error(text);\n } else {\n throw e;\n }\n }\n }\n\n async fetchUser(id, fields = 'first_name,last_name,profile_pic', cache = false) {\n const key = id + fields;\n let props;\n\n if (cache && userCache[key]) {\n props = userCache[key];\n props.fromCache = true;\n } else {\n const {body} = await fetch(`https://graph.facebook.com/v2.6/${id}`, {\n query: {access_token: this._token, fields}, json: true\n });\n\n props = body;\n props.fromCache = false;\n\n if (cache) {\n userCache[key] = props;\n }\n }\n\n return props;\n }\n\n async handleMessage(input) {\n const body = JSON.parse(JSON.stringify(input));\n const message = body.entry[0].messaging[0];\n Object.assign(message, message.message);\n delete message.message;\n\n message.raw = input;\n\n message.sender.fetch = async (fields, cache) => {\n const props = await this.fetchUser(message.sender.id, fields, cache);\n Object.assign(message.sender, props);\n return message.sender;\n };\n\n if (message.postback) {\n let postback = {};\n\n try {\n postback = JSON.parse(message.postback.payload);\n } catch (e) {\n // ignore\n }\n\n if (postback.hasOwnProperty('data')) {\n message.postback = postback;\n message.data = postback.data;\n message.event = postback.event;\n\n this.emit('postback', message.event, message, message.data);\n\n if (postback.hasOwnProperty('event')) {\n this.emit(message.event, message, message.data);\n }\n } else {\n this.emit('invalid-postback', message, message.postback);\n }\n\n return;\n }\n\n if (message.delivery) {\n Object.assign(message, message.delivery);\n message.delivered = message.delivery.mids;\n\n delete message.delivery;\n\n this.emit('delivery', message, message.delivered);\n return;\n }\n\n if (message.optin) {\n message.param = message.optin.ref || true;\n message.optin = message.param;\n this.emit('optin', message, message.optin);\n return;\n }\n\n const attachments = _.groupBy(message.attachments, 'type');\n\n if (attachments.image) {\n message.images = attachments.image.map(a => a.payload.url);\n }\n\n if (attachments.video) {\n message.videos = attachments.video.map(a => a.payload.url);\n }\n\n if (attachments.audio) {\n message.audio = attachments.audio.map(a => a.payload.url)[0];\n }\n\n if (attachments.location) {\n const location = attachments.location[0];\n message.location = {...location, ...location.payload.coordinates};\n delete message.location.payload;\n }\n\n message.object = body.object;\n\n delete message.attachments;\n\n this.emit('message', message);\n }\n\n router() {\n const router = new Router();\n\n router.use(bodyParser.json());\n\n router.get('/', (req, res) => {\n if (req.query['hub.verify_token'] === this._verification) {\n res.send(req.query['hub.challenge']);\n } else {\n res.send('Error, wrong validation token');\n }\n });\n\n router.post('/', (req, res) => {\n this.handleMessage(req.body);\n res.send().status(200);\n });\n\n return router;\n }\n}\n\nexport {Bot};\n\nexport default Bot;\n"]} |