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['$']['opf:file-as'] || null } }) } function fetchCreator(creators, role) { if (!creators || !creators.length) return null var creator = creators.find(c => c.role === role) return creator ? creator.value : null } function fetchTagString(metadata, tag) { if (!metadata[tag] || !metadata[tag].length) return null var tag = metadata[tag][0] if (typeof tag !== 'string') return null return tag } function fetchDate(metadata) { var date = fetchTagString(metadata, 'dc:date') if (!date) return null var dateSplit = date.split('-') if (!dateSplit.length || dateSplit[0].length !== 4 || isNaN(dateSplit[0])) return null return dateSplit[0] } function fetchPublisher(metadata) { return fetchTagString(metadata, 'dc:publisher') } function fetchISBN(metadata) { if (!metadata['dc:identifier'] || !metadata['dc:identifier'].length) return null var identifiers = metadata['dc:identifier'] var isbnObj = identifiers.find(i => i['$'] && i['$']['opf:scheme'] === 'ISBN') return isbnObj ? isbnObj['_'] || null : null } function fetchTitle(metadata) { return fetchTagString(metadata, 'dc:title') } function fetchDescription(metadata) { var description = fetchTagString(metadata, 'dc:description') if (!description) return null // check if description is HTML or plain text. only plain text allowed // calibre stores < and > as < and > description = description.replace(/</g, '<').replace(/>/g, '>') if (description.match(/|<\/?\s*[a-z-][^>]*\s*>|(\&(?:[\w\d]+|#\d+|#x[a-f\d]+);)/)) return null return description } function fetchGenres(metadata) { if (!metadata['dc:subject'] || !metadata['dc:subject'].length) return [] return metadata['dc:subject'].map(g => typeof g === 'string' ? g : null).filter(g => !!g) } function fetchLanguage(metadata) { return fetchTagString(metadata, 'dc:language') } function fetchSeries(metadata) { if(typeof metadata.meta == "undefined") return null return fetchTagString(metadata.meta, "calibre:series") } function fetchVolumeNumber(metadata) { if(typeof metadata.meta == "undefined") return null return fetchTagString(metadata.meta, "calibre:series_index") } 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), description: fetchDescription(metadata), genres: fetchGenres(metadata), language: fetchLanguage(metadata), series: fetchSeries(metadata), volumeNumber: fetchVolumeNumber(metadata) } return data }