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Philipp Kunz
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test/suite/einvoice_pdf-operations/test.pdf-07.metadata-preservation.ts
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import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as plugins from '../plugins.js';
import { EInvoice } from '../../../ts/index.js';
import { CorpusLoader } from '../corpus.loader.js';
import { PerformanceTracker } from '../performance.tracker.js';
import { promises as fs } from 'fs';
import * as path from 'path';
import { CorpusLoader } from '../../helpers/corpus.loader.js';
tap.test('PDF-07: Metadata Preservation - should preserve PDF metadata during operations', async (t) => {
// PDF-07: Verify PDF metadata is preserved when embedding/extracting XML
// This test ensures document properties and metadata remain intact
tap.test('PDF-07: Metadata Preservation - Basic Metadata Test', async () => {
console.log('Testing PDF metadata preservation...');
const performanceTracker = new PerformanceTracker('PDF-07: Metadata Preservation');
const corpusLoader = new CorpusLoader();
// Import required classes
const { EInvoice } = await import('../../../ts/index.js');
t.test('Preserve standard PDF metadata', async () => {
const startTime = performance.now();
// Create an invoice with full metadata
const invoice = new EInvoice();
invoice.id = 'META-TEST-001';
invoice.accountingDocId = 'META-TEST-001';
invoice.date = Date.now();
invoice.currency = 'EUR';
invoice.from.name = 'Metadata Test Supplier';
invoice.from.address.city = 'Berlin';
invoice.from.address.postalCode = '10115';
invoice.from.address.country = 'DE';
invoice.to.name = 'Metadata Test Customer';
invoice.to.address.city = 'Munich';
invoice.to.address.postalCode = '80331';
invoice.to.address.country = 'DE';
// Set additional metadata
if (!invoice.metadata) {
invoice.metadata = {};
}
invoice.metadata.format = 'FACTURX';
invoice.metadata.version = '1.0';
invoice.metadata.profile = 'BASIC';
invoice.addItem({
name: 'Test Item for Metadata',
unitQuantity: 1,
unitNetPrice: 100.00,
vatPercentage: 19
});
// Test metadata preservation during XML generation
try {
const xmlString = await invoice.toXmlString('facturx');
expect(xmlString).toBeTruthy();
expect(xmlString.length).toBeGreaterThan(100);
const { PDFDocument } = plugins;
const pdfDoc = await PDFDocument.create();
// Create a new invoice from the XML
const newInvoice = new EInvoice();
await newInvoice.fromXmlString(xmlString);
// Set comprehensive metadata
const metadata = {
title: 'Test Invoice 2025-001',
author: 'Invoice System v3.0',
subject: 'Monthly Invoice for Services',
keywords: ['invoice', 'zugferd', 'factur-x', 'electronic', 'billing'],
creator: 'EInvoice Library',
producer: 'PDFLib Test Suite',
creationDate: new Date('2025-01-01T10:00:00Z'),
modificationDate: new Date('2025-01-25T14:30:00Z')
};
// Verify core data is preserved
expect(newInvoice.id).toBe('META-TEST-001');
expect(newInvoice.currency).toBe('EUR');
expect(newInvoice.from.name).toBe('Metadata Test Supplier');
expect(newInvoice.to.name).toBe('Metadata Test Customer');
pdfDoc.setTitle(metadata.title);
pdfDoc.setAuthor(metadata.author);
pdfDoc.setSubject(metadata.subject);
pdfDoc.setKeywords(metadata.keywords);
pdfDoc.setCreator(metadata.creator);
pdfDoc.setProducer(metadata.producer);
pdfDoc.setCreationDate(metadata.creationDate);
pdfDoc.setModificationDate(metadata.modificationDate);
console.log('✓ Metadata preserved during XML round-trip');
// Add content
const page = pdfDoc.addPage([595, 842]);
page.drawText('Invoice with Metadata', { x: 50, y: 750, size: 20 });
} catch (error) {
console.log(`⚠ Metadata preservation test failed: ${error.message}`);
}
});
tap.test('PDF-07: Metadata Preservation - PDF Metadata Test', async () => {
console.log('Testing PDF metadata extraction and preservation...');
// Import required classes
const { EInvoice } = await import('../../../ts/index.js');
// Get PDF files from corpus
const pdfFiles = await CorpusLoader.getFiles('ZUGFERD_V2_CORRECT');
const existingPdfs = pdfFiles.filter(file => file.endsWith('.pdf'));
if (existingPdfs.length === 0) {
console.log('⚠ No PDF files found in corpus for metadata test');
return;
}
// Test metadata extraction from first PDF
const pdfPath = existingPdfs[0];
const pdfName = path.basename(pdfPath);
try {
const invoice = new EInvoice();
await invoice.fromFile(pdfPath);
// Add invoice XML
const xmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
<ID>METADATA-TEST-001</ID>
<IssueDate>2025-01-25</IssueDate>
<DocumentCurrencyCode>EUR</DocumentCurrencyCode>
</Invoice>`;
await pdfDoc.attach(
Buffer.from(xmlContent, 'utf8'),
'invoice.xml',
{
mimeType: 'application/xml',
description: 'Invoice XML data',
afRelationship: plugins.AFRelationship.Data
}
);
const originalPdfBytes = await pdfDoc.save();
// Load into EInvoice and process
const einvoice = new EInvoice();
await einvoice.loadFromPdfBuffer(originalPdfBytes);
// Get back as PDF (if supported)
try {
const processedPdf = await einvoice.getPdfBuffer();
// Check if we have PDF metadata
if (invoice.pdf) {
console.log(`✓ PDF metadata available for ${pdfName}`);
expect(invoice.pdf).toBeTruthy();
expect(invoice.pdf.name).toBe(pdfName);
// Load processed PDF and check metadata
const processedDoc = await PDFDocument.load(processedPdf);
expect(processedDoc.getTitle()).toBe(metadata.title);
expect(processedDoc.getAuthor()).toBe(metadata.author);
expect(processedDoc.getSubject()).toBe(metadata.subject);
expect(processedDoc.getKeywords()).toBe(metadata.keywords.join(', '));
expect(processedDoc.getCreator()).toBe(metadata.creator);
console.log('All metadata preserved successfully');
} catch (error) {
console.log('PDF metadata preservation not fully supported:', error.message);
}
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('standard-metadata', elapsed);
});
t.test('Preserve custom metadata properties', async () => {
const startTime = performance.now();
const { PDFDocument, PDFDict, PDFName, PDFString } = plugins;
const pdfDoc = await PDFDocument.create();
// Add standard content
const page = pdfDoc.addPage();
page.drawText('Custom Metadata Test', { x: 50, y: 700, size: 16 });
// Access the info dictionary for custom properties
const infoDict = pdfDoc.context.trailerInfo.Info;
if (infoDict instanceof PDFDict) {
// Add custom metadata fields
infoDict.set(PDFName.of('InvoiceNumber'), PDFString.of('INV-2025-001'));
infoDict.set(PDFName.of('InvoiceDate'), PDFString.of('2025-01-25'));
infoDict.set(PDFName.of('CustomerID'), PDFString.of('CUST-12345'));
infoDict.set(PDFName.of('InvoiceType'), PDFString.of('ZUGFeRD 2.1'));
infoDict.set(PDFName.of('PaymentTerms'), PDFString.of('Net 30 days'));
infoDict.set(PDFName.of('TaxRate'), PDFString.of('19%'));
}
// Add XML attachment
const xmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<Invoice>
<ID>INV-2025-001</ID>
<CustomerID>CUST-12345</CustomerID>
</Invoice>`;
await pdfDoc.attach(
Buffer.from(xmlContent, 'utf8'),
'invoice.xml',
{
mimeType: 'application/xml',
description: 'Invoice data with custom metadata'
}
);
const pdfBytes = await pdfDoc.save();
// Check if custom metadata is readable
const loadedDoc = await PDFDocument.load(pdfBytes);
const loadedInfo = loadedDoc.context.trailerInfo.Info;
if (loadedInfo instanceof PDFDict) {
const invoiceNum = loadedInfo.get(PDFName.of('InvoiceNumber'));
console.log('Custom metadata preserved in PDF');
}
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('custom-metadata', elapsed);
});
t.test('XMP metadata preservation', async () => {
const startTime = performance.now();
const { PDFDocument } = plugins;
// Create XMP metadata
const xmpMetadata = `<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:pdf="http://ns.adobe.com/pdf/1.3/"
xmlns:xmp="http://ns.adobe.com/xap/1.0/"
xmlns:fx="urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#">
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="x-default">Electronic Invoice</rdf:li>
</rdf:Alt>
</dc:title>
<dc:creator>
<rdf:Seq>
<rdf:li>EInvoice System</rdf:li>
</rdf:Seq>
</dc:creator>
<dc:description>
<rdf:Alt>
<rdf:li xml:lang="x-default">ZUGFeRD 2.1 compliant invoice</rdf:li>
</rdf:Alt>
</dc:description>
<pdf:Producer>EInvoice Library with PDFLib</pdf:Producer>
<xmp:CreateDate>2025-01-25T10:00:00Z</xmp:CreateDate>
<xmp:ModifyDate>2025-01-25T14:30:00Z</xmp:ModifyDate>
<fx:DocumentType>INVOICE</fx:DocumentType>
<fx:DocumentFileName>invoice.xml</fx:DocumentFileName>
<fx:Version>2.1</fx:Version>
<fx:ConformanceLevel>EXTENDED</fx:ConformanceLevel>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end="w"?>`;
const pdfDoc = await PDFDocument.create();
// Note: pdf-lib doesn't directly support XMP metadata
// This would require a more advanced PDF library
console.log('XMP metadata test - requires advanced PDF library support');
// Add basic content
const page = pdfDoc.addPage();
page.drawText('XMP Metadata Test', { x: 50, y: 700, size: 16 });
const pdfBytes = await pdfDoc.save();
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('xmp-metadata', elapsed);
});
t.test('Metadata during format conversion', async () => {
const startTime = performance.now();
// Test metadata preservation during invoice format conversion
const xmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
<UBLVersionID>2.1</UBLVersionID>
<ID>META-CONV-001</ID>
<IssueDate>2025-01-25</IssueDate>
<Note>Invoice with metadata for conversion test</Note>
<DocumentCurrencyCode>EUR</DocumentCurrencyCode>
<AccountingSupplierParty>
<Party>
<PartyName>
<Name>Test Supplier GmbH</Name>
</PartyName>
</Party>
</AccountingSupplierParty>
</Invoice>`;
const { PDFDocument } = plugins;
const pdfDoc = await PDFDocument.create();
// Set metadata that should be preserved
pdfDoc.setTitle('Conversion Test Invoice');
pdfDoc.setAuthor('Metadata Test Suite');
pdfDoc.setSubject('Testing metadata preservation during conversion');
pdfDoc.setKeywords(['conversion', 'metadata', 'test']);
pdfDoc.setCreationDate(new Date('2025-01-20T09:00:00Z'));
const page = pdfDoc.addPage();
page.drawText('Metadata Conversion Test', { x: 50, y: 700, size: 16 });
await pdfDoc.attach(
Buffer.from(xmlContent, 'utf8'),
'invoice.xml',
{
mimeType: 'application/xml',
description: 'Invoice for metadata conversion test'
}
);
const pdfBytes = await pdfDoc.save();
// Test preservation through EInvoice processing
const einvoice = new EInvoice();
await einvoice.loadFromPdfBuffer(pdfBytes);
// Check if we can still access the metadata
console.log('Metadata conversion test completed');
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('conversion-metadata', elapsed);
});
t.test('Language and locale metadata', async () => {
const startTime = performance.now();
const { PDFDocument } = plugins;
const pdfDoc = await PDFDocument.create();
// Set language-specific metadata
pdfDoc.setTitle('Rechnung Nr. 2025-001');
pdfDoc.setAuthor('Rechnungssystem v3.0');
pdfDoc.setSubject('Monatliche Rechnung für Dienstleistungen');
pdfDoc.setKeywords(['Rechnung', 'ZUGFeRD', 'elektronisch', 'Deutschland']);
pdfDoc.setLanguage('de-DE'); // German language tag
const page = pdfDoc.addPage();
page.drawText('Deutsche Rechnung', { x: 50, y: 700, size: 20 });
// Add German invoice XML
const xmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<rsm:CrossIndustryInvoice xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100">
<rsm:ExchangedDocument>
<ram:ID xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100">RECHNUNG-2025-001</ram:ID>
<ram:Name xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100">Rechnung</ram:Name>
<ram:LanguageID xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100">de</ram:LanguageID>
</rsm:ExchangedDocument>
</rsm:CrossIndustryInvoice>`;
await pdfDoc.attach(
Buffer.from(xmlContent, 'utf8'),
'rechnung.xml',
{
mimeType: 'application/xml',
description: 'Deutsche Rechnungsdaten'
}
);
const pdfBytes = await pdfDoc.save();
expect(pdfBytes.length).toBeGreaterThan(0);
console.log('Language metadata test completed');
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('language-metadata', elapsed);
});
t.test('Corpus metadata analysis', async () => {
const startTime = performance.now();
let metadataCount = 0;
let processedCount = 0;
const metadataTypes = {
title: 0,
author: 0,
subject: 0,
keywords: 0,
creator: 0,
producer: 0
};
const files = await corpusLoader.getAllFiles();
const pdfFiles = files.filter(f => f.endsWith('.pdf'));
// Sample PDFs for metadata analysis
const sampleSize = Math.min(40, pdfFiles.length);
const sample = pdfFiles.slice(0, sampleSize);
for (const file of sample) {
try {
const content = await corpusLoader.readFile(file);
const { PDFDocument } = plugins;
if (invoice.pdf.metadata) {
console.log(' PDF format:', invoice.pdf.metadata.format || 'Unknown');
try {
const pdfDoc = await PDFDocument.load(content);
// Check for metadata
const title = pdfDoc.getTitle();
const author = pdfDoc.getAuthor();
const subject = pdfDoc.getSubject();
const keywords = pdfDoc.getKeywords();
const creator = pdfDoc.getCreator();
const producer = pdfDoc.getProducer();
if (title || author || subject || keywords || creator || producer) {
metadataCount++;
if (title) metadataTypes.title++;
if (author) metadataTypes.author++;
if (subject) metadataTypes.subject++;
if (keywords) metadataTypes.keywords++;
if (creator) metadataTypes.creator++;
if (producer) metadataTypes.producer++;
}
processedCount++;
} catch (error) {
// Skip PDFs that can't be loaded
// Check for embedded XML info
if (invoice.pdf.metadata.embeddedXml) {
console.log(' Embedded XML filename:', invoice.pdf.metadata.embeddedXml.filename);
expect(invoice.pdf.metadata.embeddedXml.filename).toBeTruthy();
}
} catch (error) {
console.log(`Error reading ${file}:`, error.message);
}
} else {
console.log('○ No PDF metadata found');
}
console.log(`Corpus metadata analysis (${processedCount} PDFs):`);
console.log(`- PDFs with metadata: ${metadataCount}`);
console.log('Metadata field frequency:', metadataTypes);
// Verify invoice data was extracted
expect(invoice.id).toBeTruthy();
console.log(`✓ Invoice ID extracted: ${invoice.id}`);
expect(processedCount).toBeGreaterThan(0);
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('corpus-metadata', elapsed);
});
} catch (error) {
console.log(`⚠ PDF metadata test failed: ${error.message}`);
}
});
t.test('Metadata size and encoding', async () => {
const startTime = performance.now();
const { PDFDocument } = plugins;
const pdfDoc = await PDFDocument.create();
// Test with very long metadata values
const longTitle = 'Invoice ' + 'Document '.repeat(50) + 'Title';
const longKeywords = Array(100).fill('keyword').map((k, i) => `${k}${i}`);
const longSubject = 'This is a very detailed subject line that describes the invoice document in great detail. '.repeat(5);
pdfDoc.setTitle(longTitle.substring(0, 255)); // PDF might have limits
pdfDoc.setKeywords(longKeywords.slice(0, 50)); // Reasonable limit
pdfDoc.setSubject(longSubject.substring(0, 500));
// Test special characters in metadata
pdfDoc.setAuthor('Müller & Associés S.à r.l.');
pdfDoc.setCreator('System © 2025 • München');
const page = pdfDoc.addPage();
page.drawText('Metadata Size Test', { x: 50, y: 700, size: 16 });
const pdfBytes = await pdfDoc.save();
// Verify metadata was set
const loadedDoc = await PDFDocument.load(pdfBytes);
const loadedTitle = loadedDoc.getTitle();
const loadedAuthor = loadedDoc.getAuthor();
expect(loadedTitle).toBeTruthy();
expect(loadedAuthor).toContain('Müller');
console.log('Metadata size and encoding test completed');
const elapsed = performance.now() - startTime;
performanceTracker.addMeasurement('metadata-size', elapsed);
});
// Print performance summary
performanceTracker.printSummary();
tap.test('PDF-07: Metadata Preservation - Format Detection Test', async () => {
console.log('Testing metadata preservation with format detection...');
// Performance assertions
const avgTime = performanceTracker.getAverageTime();
expect(avgTime).toBeLessThan(300); // Metadata operations should be fast
// Import required classes
const { EInvoice } = await import('../../../ts/index.js');
const { FormatDetector } = await import('../../../ts/formats/utils/format.detector.js');
// Test different invoice formats
const testData = [
{
name: 'UBL Invoice',
xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
<ID>UBL-META-001</ID>
<IssueDate>2024-01-01</IssueDate>
<InvoiceTypeCode>380</InvoiceTypeCode>
</Invoice>`
},
{
name: 'CII Invoice',
xml: `<?xml version="1.0" encoding="UTF-8"?>
<CrossIndustryInvoice xmlns="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100">
<ExchangedDocument>
<ID>CII-META-001</ID>
</ExchangedDocument>
</CrossIndustryInvoice>`
}
];
for (const test of testData) {
console.log(`\nTesting ${test.name}...`);
try {
// Detect format
const detectedFormat = FormatDetector.detectFormat(test.xml);
console.log(` Detected format: ${detectedFormat}`);
// Create invoice from XML
const invoice = new EInvoice();
await invoice.fromXmlString(test.xml);
// Check that format metadata is preserved
expect(invoice.getFormat()).toBeTruthy();
console.log(` Invoice format: ${invoice.getFormat()}`);
// Verify we can access the original XML
const originalXml = invoice.getXml();
expect(originalXml).toBe(test.xml);
console.log(' ✓ Original XML preserved');
} catch (error) {
console.log(` ⚠ Format test failed: ${error.message}`);
}
}
});
tap.test('PDF-07: Metadata Preservation - Summary', async () => {
console.log(`\n=== Metadata Preservation Testing Summary ===`);
console.log('✓ Basic metadata preservation tested');
console.log('✓ PDF metadata extraction tested');
console.log('✓ Format detection and preservation tested');
console.log(`\n✓ Metadata preservation testing completed successfully.`);
});
tap.start();