2021-11-09 03:05:12 +01:00
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const { xmlToJSON } = require('./index')
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2021-12-04 22:07:43 +01:00
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const { stripHtml } = require("string-strip-html")
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2021-11-09 03:05:12 +01:00
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function parseCreators(metadata) {
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if (!metadata['dc:creator']) return null
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var creators = metadata['dc:creator']
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if (!creators.length) return null
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return creators.map(c => {
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if (typeof c !== 'object' || !c['$'] || !c['_']) return false
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return {
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value: c['_'],
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role: c['$']['opf:role'] || null,
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fileAs: c['$']['opf:file-as'] || null
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}
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})
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}
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function fetchCreator(creators, role) {
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if (!creators || !creators.length) return null
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var creator = creators.find(c => c.role === role)
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return creator ? creator.value : null
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}
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2021-11-10 00:54:28 +01:00
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function fetchTagString(metadata, tag) {
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if (!metadata[tag] || !metadata[tag].length) return null
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var tag = metadata[tag][0]
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if (typeof tag !== 'string') return null
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return tag
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}
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2021-11-09 03:05:12 +01:00
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function fetchDate(metadata) {
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2021-11-10 00:54:28 +01:00
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var date = fetchTagString(metadata, 'dc:date')
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if (!date) return null
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var dateSplit = date.split('-')
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2021-11-09 03:05:12 +01:00
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if (!dateSplit.length || dateSplit[0].length !== 4 || isNaN(dateSplit[0])) return null
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return dateSplit[0]
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}
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function fetchPublisher(metadata) {
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2021-11-10 00:54:28 +01:00
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return fetchTagString(metadata, 'dc:publisher')
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2021-11-09 03:05:12 +01:00
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}
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function fetchISBN(metadata) {
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if (!metadata['dc:identifier'] || !metadata['dc:identifier'].length) return null
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var identifiers = metadata['dc:identifier']
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var isbnObj = identifiers.find(i => i['$'] && i['$']['opf:scheme'] === 'ISBN')
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return isbnObj ? isbnObj['_'] || null : null
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}
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function fetchTitle(metadata) {
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2021-11-10 00:54:28 +01:00
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return fetchTagString(metadata, 'dc:title')
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}
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function fetchDescription(metadata) {
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var description = fetchTagString(metadata, 'dc:description')
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if (!description) return null
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// check if description is HTML or plain text. only plain text allowed
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// calibre stores < and > as < and >
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description = description.replace(/</g, '<').replace(/>/g, '>')
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2021-12-04 22:07:43 +01:00
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if (description.match(/<!DOCTYPE html>|<\/?\s*[a-z-][^>]*\s*>|(\&(?:[\w\d]+|#\d+|#x[a-f\d]+);)/)) return stripHtml(description).result
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2021-11-10 00:54:28 +01:00
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return description
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}
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function fetchGenres(metadata) {
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if (!metadata['dc:subject'] || !metadata['dc:subject'].length) return []
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return metadata['dc:subject'].map(g => typeof g === 'string' ? g : null).filter(g => !!g)
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}
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function fetchLanguage(metadata) {
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return fetchTagString(metadata, 'dc:language')
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2021-11-09 03:05:12 +01:00
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}
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2021-12-04 22:07:31 +01:00
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function fetchSeries(metadata) {
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if(typeof metadata.meta == "undefined") return null
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return fetchTagString(metadata.meta, "calibre:series")
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}
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function fetchVolumeNumber(metadata) {
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if(typeof metadata.meta == "undefined") return null
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return fetchTagString(metadata.meta, "calibre:series_index")
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}
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2021-11-09 03:05:12 +01:00
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module.exports.parseOpfMetadataXML = async (xml) => {
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var json = await xmlToJSON(xml)
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if (!json || !json.package || !json.package.metadata) return null
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var metadata = json.package.metadata
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2021-11-10 00:54:28 +01:00
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2021-11-09 03:05:12 +01:00
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if (Array.isArray(metadata)) {
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if (!metadata.length) return null
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metadata = metadata[0]
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}
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var creators = parseCreators(metadata)
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var data = {
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title: fetchTitle(metadata),
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author: fetchCreator(creators, 'aut'),
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narrator: fetchCreator(creators, 'nrt'),
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publishYear: fetchDate(metadata),
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publisher: fetchPublisher(metadata),
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2021-11-10 00:54:28 +01:00
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isbn: fetchISBN(metadata),
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description: fetchDescription(metadata),
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genres: fetchGenres(metadata),
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2021-12-04 22:07:31 +01:00
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language: fetchLanguage(metadata),
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series: fetchSeries(metadata),
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volumeNumber: fetchVolumeNumber(metadata)
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2021-11-09 03:05:12 +01:00
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}
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return data
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}
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