add fallback parser when LD/JSON not found, use DOM parser

lib/services/ldjson-parser.js

@@ -0,0 +1,67 @@
+const cheerio = require('cheerio')
+const dayjs = require('dayjs')
+const { parseDates } = require('../parser-utils')
+
+const parseEventData = (eventData) => {
+  const startDate = eventData.startDate && dayjs(eventData.startDate)
+  const endDate = eventData.endDate && dayjs(eventData.endDate)
+  const { start, duration } = parseDates(startDate, endDate)
+  const { location } = eventData || {}
+  const { address } = location || {}
+
+  const locationStr = location ? [
+    location.name || '',
+    address.streetAddress || '',
+    address.addressLocality || '',
+    address.postalCode || '',
+    address.addressCountry || '',
+  ].join(' ') : ''
+  const cleanedLocationStr = locationStr.replace(/\r?\n|\r/g, ' ')
+  const title = eventData.name || ''
+  const url = eventData.url || ''
+  const description = eventData.description || ''
+
+  return {
+    start,
+    duration,
+    location: cleanedLocationStr,
+    title,
+    url,
+    description,
+  }
+}
+
+const parseUsingLDJSONData = (html) => {
+  try {
+    // 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]
+
+      if (!firstNode || !firstNode.data) {
+        return data
+      }
+
+      if (firstNode.data.startsWith('//<![CDATA')) {
+        return firstNode.data
+      }
+
+      return data
+    }, null)
+
+    if (!rawData) {
+    return null
+    }
+
+    const eventData = JSON.parse(rawData.slice(12, -5))
+    const data = parseEventData(eventData)
+
+    return data
+  } catch (err) {
+    throw err
+  }
+}
+
+module.exports = parseUsingLDJSONData