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

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const cheerio = require('cheerio')
const dayjs = require('dayjs')
const { parseDates } = require('../parser-utils')
const parseDate = (timeText = '') => {
const parts = timeText.split('at')
const datePart = parts[0] || null
const timePart = parts[1] || null
const rangeTimeParts = timePart ? timePart.split('') : []
const startTimePart = `${datePart || ''}${rangeTimeParts[0] || ''}`
const endTimePart = `${datePart || ''}${rangeTimeParts[1] || ''}`
const startTime = startTimePart ?
dayjs(startTimePart) :
dayjs(new Date())
const endTime = dayjs(endTimePart)
const normalizedStartTime = startTime.isValid() ? startTime : dayjs(new Date())
const normalizedEndTime = endTime.isValid() ? endTime : dayjs(new Date())
const { start, duration } = parseDates(normalizedStartTime, normalizedEndTime)
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const minimumDuration = { ...duration, minutes: duration.minutes || 120 }
return {
start,
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duration: minimumDuration,
}
}
const createLocationData = (streetText, areaText) => {
const location = ([ streetText, areaText ])
.filter(i => i)
.join(', ') || ''
return location.replace(/\r?\n|\r/g, ' ')
}
// NOTE: Fallback parser
// Attempt reading event data directly from DOM
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const parseUsingDOM = (html, { logger }) => {
if (logger) {
logger.log({
message: 'Using fallback DOM parser',
level: 'info',
service: 'parser',
})
}
const $ = cheerio.load(html)
const title = $('title').text()
const $eventSummary = $('#event_summary')
const $eventNode = $eventSummary ? $eventSummary.children()[1] : null
const $timeNode = $eventNode ? $eventNode.childNodes[0] : null
const $locationNode = $eventNode ? $eventNode.childNodes[1] : null
const timeText = $timeNode ? $timeNode.attribs.title : ''
const $locationBlock = $locationNode ? $($locationNode).find('td') : null
const $locationBlockTDs = $locationBlock ? $locationBlock.children() : []
const $streetBlock = $locationBlockTDs[1] || null
const $areaBlock = $locationBlockTDs[2] || null
const streetText = $streetBlock ? $($streetBlock).text() : ''
const areaText = $areaBlock ? $($areaBlock).text() : ''
const location = createLocationData(streetText, areaText)
const { start, duration } = parseDate(timeText)
const eventData = {
location,
start,
duration,
title,
}
if (!eventData.title || !eventData.start) {
return null
}
return eventData
}
module.exports = parseUsingDOM