Facebook-Events-iCal-Converter/lib/services/ldjson-parser.js

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const cheerio = require('cheerio')
const dayjs = require('dayjs')
const { parseDates } = require('../parser-utils')
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const parseEventData = (eventData) => {
const startDate = eventData.startDate ?
dayjs(eventData.startDate) :
dayjs(new Date())
const endDate = eventData.endDate && dayjs(eventData.endDate)
const { start, duration } = parseDates(startDate, endDate)
const { location } = eventData || {}
const { address } = location || {}
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const locationName = location ? location.name : ''
const addressStr = address ? [
address.streetAddress || '',
address.addressLocality || '',
address.postalCode || '',
address.addressCountry || '',
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].join(' ') : ''
const locationStr = [
locationName,
addressStr,
].join(' ')
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const cleanedLocationStr = locationStr.trim().replace(/\r?\n|\r/g, ' ')
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const title = eventData.name || ''
const url = eventData.url || ''
const description = eventData.description || ''
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return {
start,
duration,
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location: cleanedLocationStr,
title,
url,
description,
}
}
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const parseUsingLDJSONData = (html, { logger }) => {
if (logger) {
logger.log({
message: 'Parsing using LDJSON parser',
level: 'info',
service: 'parser',
})
}
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// NOTE: Mobile web should have serialized
// event info in one of the script tags
const $ = cheerio.load(html)
const $scripts = $('head script[type="application/ld+json"]')
const rawData = $scripts.toArray().reduce((data, node) => {
const firstNode = node.children[0]
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if (!firstNode || !firstNode.data) {
return data
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}
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// NOTE: Handle prefix
if (firstNode.data.startsWith('//<![CDATA')) {
return firstNode.data.slice(12, -5)
}
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if (firstNode.data) {
return firstNode.data.trim()
}
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return data
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}, null)
if (!rawData) {
return null
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}
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const eventData = JSON.parse(rawData)
const data = parseEventData(eventData)
return data
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}
module.exports = parseUsingLDJSONData