116 lines
3.5 KiB
TypeScript
116 lines
3.5 KiB
TypeScript
import * as plugins from './plugins.js';
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import * as interfaces from './interfaces.js';
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import { PDFDocument, PDFDict, PDFName, PDFRawStream } from 'pdf-lib';
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export class XInvoice {
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public pdfUint8Array: Uint8Array;
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constructor(pdfBuffer: Uint8Array | Buffer) {
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this.pdfUint8Array = Uint8Array.from(pdfBuffer);
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}
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public async embedXml(xmlString: string): Promise<void> {
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try {
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const pdfDoc = await PDFDocument.load(this.pdfUint8Array);
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const xmlBuffer = new TextEncoder().encode(xmlString);
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pdfDoc.attach(xmlBuffer, plugins.path.basename('invoice.xml'), {
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mimeType: 'application/xml',
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description: 'XRechnung XML Invoice',
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});
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const modifiedPdfBytes = await pdfDoc.save();
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this.pdfUint8Array = modifiedPdfBytes;
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console.log(`PDF Buffer updated with new XML attachment!`);
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} catch (error) {
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console.error('Error embedding XML into PDF:', error);
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throw error;
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}
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}
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/**
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* reads the xml part and returns parsed structured data
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* @returns {Promise<interfaces.IXInvoice>} Parsed XML data
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*/
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public async getParsedXmlData(): Promise<interfaces.IXInvoice> {
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try {
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const pdfBuffer = this.pdfUint8Array;
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const pdfDoc = await PDFDocument.load(pdfBuffer);
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const namesDict = pdfDoc.catalog.get(PDFName.of('Names')) as PDFDict;
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if (!namesDict) throw new Error('No Names dictionary found in PDF!');
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const embeddedFilesDict = namesDict.get(PDFName.of('EmbeddedFiles')) as PDFDict;
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if (!embeddedFilesDict) throw new Error('No EmbeddedFiles dictionary found!');
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const filesSpecDict = embeddedFilesDict.get(PDFName.of('Names')) as PDFDict;
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if (!filesSpecDict) throw new Error('No files specified in EmbeddedFiles dictionary!');
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let xmlFile: PDFRawStream | undefined = undefined;
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const entries = filesSpecDict.entries();
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for (const [key, fileSpecValue] of entries) {
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const fileSpec = fileSpecValue as PDFDict;
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const efDict = fileSpec.get(PDFName.of('EF')) as PDFDict;
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xmlFile = efDict.get(PDFName.of('F')) as PDFRawStream;
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if (xmlFile) break;
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}
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if (!xmlFile) throw new Error('XML file stream not found!');
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const xmlBytes = xmlFile.getContents();
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const xmlContent = new TextDecoder().decode(xmlBytes);
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console.log(`Read embedded XML: ${xmlContent}`);
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return this.parseXmlToInvoice(xmlContent);
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} catch (error) {
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console.error('Error extracting or parsing embedded XML from PDF:', error);
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throw error;
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}
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}
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private parseXmlToInvoice(xmlContent: string): interfaces.IXInvoice {
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// Implement XML parsing logic here
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// Placeholder return, replace with actual parsing result
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return {
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InvoiceNumber: '12345',
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DateIssued: '2023-04-01',
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Seller: {
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Name: 'Seller Co',
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Address: {
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Street: '1234 Market St',
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City: 'Sample City',
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PostalCode: '12345',
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Country: 'DE',
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},
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Contact: {
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Email: 'contact@sellerco.com',
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Phone: '123-456-7890',
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},
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},
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Buyer: {
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Name: 'Buyer Inc',
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Address: {
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Street: '5678 Trade Rd',
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City: 'Trade City',
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PostalCode: '67890',
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Country: 'DE',
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},
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Contact: {
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Email: 'info@buyerinc.com',
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Phone: '987-654-3210',
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},
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},
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Items: [
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{
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Description: 'Item 1',
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Quantity: 10,
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UnitPrice: 9.99,
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TotalPrice: 99.9,
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},
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],
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TotalAmount: 99.9,
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};
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}
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}
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