Fix: books read stat #167, Add: scanner parse metadata.opf and metadata.xml and use data #141

server/utils/parseOpfMetadata.js

@@ -0,0 +1,78 @@
+const { xmlToJSON } = require('./index')
+
+function parseCreators(metadata) {
+  if (!metadata['dc:creator']) return null
+  var creators = metadata['dc:creator']
+  if (!creators.length) return null
+  return creators.map(c => {
+    if (typeof c !== 'object' || !c['$'] || !c['_']) return false
+    return {
+      value: c['_'],
+      role: c['$']['opf:role'] || null,
+      fileAs: c['$']['opf:file-as'] || null
+    }
+  })
+}
+
+function fetchCreator(creators, role) {
+  if (!creators || !creators.length) return null
+  var creator = creators.find(c => c.role === role)
+  return creator ? creator.value : null
+}
+
+function fetchDate(metadata) {
+  if (!metadata['dc:date']) return null
+  var dates = metadata['dc:date']
+  if (!dates.length || typeof dates[0] !== 'string') return null
+  var dateSplit = dates[0].split('-')
+  if (!dateSplit.length || dateSplit[0].length !== 4 || isNaN(dateSplit[0])) return null
+  return dateSplit[0]
+}
+
+function fetchPublisher(metadata) {
+  if (!metadata['dc:publisher']) return null
+  var publishers = metadata['dc:publisher']
+  if (!publishers.length || typeof publishers[0] !== 'string') return null
+  return publishers[0]
+}
+
+function fetchISBN(metadata) {
+  if (!metadata['dc:identifier'] || !metadata['dc:identifier'].length) return null
+  var identifiers = metadata['dc:identifier']
+  var isbnObj = identifiers.find(i => i['$'] && i['$']['opf:scheme'] === 'ISBN')
+  return isbnObj ? isbnObj['_'] || null : null
+}
+
+function fetchTitle(metadata) {
+  if (!metadata['dc:title']) return null
+  var titles = metadata['dc:title']
+  if (!titles.length) return null
+  if (typeof titles[0] === 'string') {
+    return titles[0]
+  }
+  if (titles[0]['_']) {
+    return titles[0]['_']
+  }
+  return null
+}
+
+module.exports.parseOpfMetadataXML = async (xml) => {
+  var json = await xmlToJSON(xml)
+  if (!json || !json.package || !json.package.metadata) return null
+  var metadata = json.package.metadata
+  if (Array.isArray(metadata)) {
+    if (!metadata.length) return null
+    metadata = metadata[0]
+  }
+
+  var creators = parseCreators(metadata)
+  var data = {
+    title: fetchTitle(metadata),
+    author: fetchCreator(creators, 'aut'),
+    narrator: fetchCreator(creators, 'nrt'),
+    publishYear: fetchDate(metadata),
+    publisher: fetchPublisher(metadata),
+    isbn: fetchISBN(metadata)
+  }
+  return data
+}