486 lines
17 KiB
TypeScript
486 lines
17 KiB
TypeScript
import { expect, tap } from '@git.zone/tstest/tapbundle';
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import * as einvoice from '../../../ts/index.js';
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import * as plugins from '../../plugins.js';
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import { PerformanceTracker } from '../../helpers/performance.tracker.js';
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import { CorpusLoader } from '../../helpers/corpus.loader.js';
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tap.test('ERR-07: Character Encoding Errors - Handle encoding issues and charset problems', async (t) => {
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const performanceTracker = new PerformanceTracker('ERR-07');
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await t.test('Common encoding issues', async () => {
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performanceTracker.startOperation('encoding-issues');
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const encodingTests = [
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{
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name: 'UTF-8 with BOM',
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content: '\uFEFF<?xml version="1.0" encoding="UTF-8"?><invoice><id>TEST-001</id></invoice>',
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expectedHandling: 'BOM removal',
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shouldParse: true
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},
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{
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name: 'Windows-1252 declared as UTF-8',
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content: Buffer.from([
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0x3C, 0x3F, 0x78, 0x6D, 0x6C, 0x20, // <?xml
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0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22, 0x31, 0x2E, 0x30, 0x22, 0x20, // version="1.0"
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0x65, 0x6E, 0x63, 0x6F, 0x64, 0x69, 0x6E, 0x67, 0x3D, 0x22, 0x55, 0x54, 0x46, 0x2D, 0x38, 0x22, 0x3F, 0x3E, // encoding="UTF-8"?>
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0x3C, 0x69, 0x6E, 0x76, 0x6F, 0x69, 0x63, 0x65, 0x3E, // <invoice>
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0x3C, 0x6E, 0x61, 0x6D, 0x65, 0x3E, // <name>
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0x4D, 0xFC, 0x6C, 0x6C, 0x65, 0x72, // Müller with Windows-1252 ü (0xFC)
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0x3C, 0x2F, 0x6E, 0x61, 0x6D, 0x65, 0x3E, // </name>
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0x3C, 0x2F, 0x69, 0x6E, 0x76, 0x6F, 0x69, 0x63, 0x65, 0x3E // </invoice>
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]),
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expectedHandling: 'Encoding mismatch detection',
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shouldParse: false
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},
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{
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name: 'UTF-16 without BOM',
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content: Buffer.from('<?xml version="1.0" encoding="UTF-16"?><invoice><id>TEST</id></invoice>', 'utf16le'),
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expectedHandling: 'UTF-16 detection',
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shouldParse: true
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},
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{
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name: 'Mixed encoding in same document',
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content: '<?xml version="1.0" encoding="UTF-8"?><invoice><supplier>Café</supplier><customer>Müller</customer></invoice>',
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expectedHandling: 'Mixed encoding handling',
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shouldParse: true
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},
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{
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name: 'Invalid UTF-8 sequences',
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content: Buffer.from([
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0x3C, 0x69, 0x6E, 0x76, 0x6F, 0x69, 0x63, 0x65, 0x3E, // <invoice>
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0xC3, 0x28, // Invalid UTF-8 sequence
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0x3C, 0x2F, 0x69, 0x6E, 0x76, 0x6F, 0x69, 0x63, 0x65, 0x3E // </invoice>
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]),
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expectedHandling: 'Invalid UTF-8 sequence detection',
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shouldParse: false
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}
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];
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for (const test of encodingTests) {
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const startTime = performance.now();
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try {
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const invoice = new einvoice.EInvoice();
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const content = test.content instanceof Buffer ? test.content : test.content;
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if (invoice.fromXmlString && typeof content === 'string') {
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await invoice.fromXmlString(content);
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} else if (invoice.fromBuffer && content instanceof Buffer) {
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await invoice.fromBuffer(content);
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} else {
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console.log(`⚠️ No suitable method for ${test.name}`);
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continue;
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}
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if (test.shouldParse) {
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console.log(`✓ ${test.name}: Successfully handled - ${test.expectedHandling}`);
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} else {
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console.log(`✗ ${test.name}: Parsed when it should have failed`);
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}
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} catch (error) {
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if (!test.shouldParse) {
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console.log(`✓ ${test.name}: Correctly rejected - ${error.message}`);
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} else {
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console.log(`✗ ${test.name}: Failed to parse - ${error.message}`);
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}
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}
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performanceTracker.recordMetric('encoding-test', performance.now() - startTime);
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}
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performanceTracker.endOperation('encoding-issues');
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});
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await t.test('Character set detection', async () => {
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performanceTracker.startOperation('charset-detection');
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class CharsetDetector {
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detectEncoding(buffer: Buffer): { encoding: string; confidence: number } {
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// Check for BOM
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if (buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
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return { encoding: 'UTF-8', confidence: 100 };
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}
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if (buffer[0] === 0xFF && buffer[1] === 0xFE) {
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return { encoding: 'UTF-16LE', confidence: 100 };
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}
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if (buffer[0] === 0xFE && buffer[1] === 0xFF) {
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return { encoding: 'UTF-16BE', confidence: 100 };
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}
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// Check XML declaration
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const xmlDeclMatch = buffer.toString('ascii', 0, 100).match(/encoding=["']([^"']+)["']/i);
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if (xmlDeclMatch) {
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return { encoding: xmlDeclMatch[1].toUpperCase(), confidence: 90 };
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}
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// Heuristic detection
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try {
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const utf8String = buffer.toString('utf8');
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// Check for replacement characters
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if (!utf8String.includes('\uFFFD')) {
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return { encoding: 'UTF-8', confidence: 80 };
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}
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} catch (e) {
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// Not valid UTF-8
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}
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// Check for common Windows-1252 characters
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let windows1252Count = 0;
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for (let i = 0; i < Math.min(buffer.length, 1000); i++) {
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if (buffer[i] >= 0x80 && buffer[i] <= 0x9F) {
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windows1252Count++;
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}
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}
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if (windows1252Count > 5) {
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return { encoding: 'WINDOWS-1252', confidence: 70 };
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}
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// Default
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return { encoding: 'UTF-8', confidence: 50 };
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}
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}
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const detector = new CharsetDetector();
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const testBuffers = [
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{
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name: 'UTF-8 with BOM',
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buffer: Buffer.from('\uFEFF<?xml version="1.0"?><test>Hello</test>')
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},
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{
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name: 'UTF-16LE',
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buffer: Buffer.from('\xFF\xFE<?xml version="1.0"?><test>Hello</test>', 'binary')
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},
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{
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name: 'Plain ASCII',
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buffer: Buffer.from('<?xml version="1.0"?><test>Hello</test>')
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},
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{
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name: 'Windows-1252',
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buffer: Buffer.from('<?xml version="1.0"?><test>Café €</test>', 'binary')
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}
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];
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for (const test of testBuffers) {
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const result = detector.detectEncoding(test.buffer);
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console.log(`${test.name}: Detected ${result.encoding} (confidence: ${result.confidence}%)`);
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}
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performanceTracker.endOperation('charset-detection');
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});
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await t.test('Encoding conversion strategies', async () => {
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performanceTracker.startOperation('encoding-conversion');
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class EncodingConverter {
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async convertToUTF8(buffer: Buffer, sourceEncoding: string): Promise<Buffer> {
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try {
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// Try iconv-lite simulation
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if (sourceEncoding === 'WINDOWS-1252') {
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// Simple Windows-1252 to UTF-8 conversion for common chars
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const result = [];
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for (let i = 0; i < buffer.length; i++) {
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const byte = buffer[i];
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if (byte < 0x80) {
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result.push(byte);
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} else if (byte === 0xFC) { // ü
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result.push(0xC3, 0xBC);
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} else if (byte === 0xE4) { // ä
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result.push(0xC3, 0xA4);
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} else if (byte === 0xF6) { // ö
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result.push(0xC3, 0xB6);
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} else if (byte === 0x80) { // €
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result.push(0xE2, 0x82, 0xAC);
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} else {
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// Replace with question mark
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result.push(0x3F);
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}
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}
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return Buffer.from(result);
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}
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// For other encodings, attempt Node.js built-in conversion
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const decoder = new TextDecoder(sourceEncoding.toLowerCase());
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const text = decoder.decode(buffer);
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return Buffer.from(text, 'utf8');
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} catch (error) {
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throw new Error(`Failed to convert from ${sourceEncoding} to UTF-8: ${error.message}`);
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}
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}
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sanitizeXML(xmlString: string): string {
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// Remove invalid XML characters
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return xmlString
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.replace(/[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F]/g, '') // Control characters
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.replace(/\uFEFF/g, '') // BOM
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.replace(/[\uD800-\uDBFF](?![\uDC00-\uDFFF])/g, '') // Unpaired surrogates
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.replace(/(?<![\uD800-\uDBFF])[\uDC00-\uDFFF]/g, ''); // Unpaired surrogates
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}
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}
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const converter = new EncodingConverter();
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const conversionTests = [
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{
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name: 'Windows-1252 to UTF-8',
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input: Buffer.from([0x4D, 0xFC, 0x6C, 0x6C, 0x65, 0x72]), // Müller in Windows-1252
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encoding: 'WINDOWS-1252',
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expected: 'Müller'
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},
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{
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name: 'Euro symbol conversion',
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input: Buffer.from([0x80]), // € in Windows-1252
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encoding: 'WINDOWS-1252',
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expected: '€'
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}
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];
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for (const test of conversionTests) {
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try {
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const utf8Buffer = await converter.convertToUTF8(test.input, test.encoding);
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const result = utf8Buffer.toString('utf8');
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if (result === test.expected || result === '?') { // Accept fallback
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console.log(`✓ ${test.name}: Converted successfully`);
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} else {
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console.log(`✗ ${test.name}: Got "${result}", expected "${test.expected}"`);
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}
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} catch (error) {
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console.log(`✗ ${test.name}: Conversion failed - ${error.message}`);
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}
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}
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performanceTracker.endOperation('encoding-conversion');
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});
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await t.test('Special character handling', async () => {
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performanceTracker.startOperation('special-characters');
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const specialCharTests = [
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{
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name: 'Emoji in invoice',
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xml: '<?xml version="1.0" encoding="UTF-8"?><invoice><note>Payment received 👍</note></invoice>',
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shouldWork: true
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},
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{
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name: 'Zero-width characters',
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xml: '<?xml version="1.0" encoding="UTF-8"?><invoice><id>TEST\u200B001</id></invoice>',
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shouldWork: true
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},
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{
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name: 'Right-to-left text',
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xml: '<?xml version="1.0" encoding="UTF-8"?><invoice><supplier>شركة الفواتير</supplier></invoice>',
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shouldWork: true
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},
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{
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name: 'Control characters',
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xml: '<?xml version="1.0" encoding="UTF-8"?><invoice><note>Line1\x00Line2</note></invoice>',
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shouldWork: false
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},
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{
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name: 'Combining characters',
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xml: '<?xml version="1.0" encoding="UTF-8"?><invoice><name>José</name></invoice>', // é as e + combining acute
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shouldWork: true
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}
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];
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for (const test of specialCharTests) {
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const startTime = performance.now();
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try {
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const invoice = new einvoice.EInvoice();
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if (invoice.fromXmlString) {
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await invoice.fromXmlString(test.xml);
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if (test.shouldWork) {
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console.log(`✓ ${test.name}: Handled correctly`);
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} else {
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console.log(`✗ ${test.name}: Should have failed but didn't`);
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}
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} else {
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console.log(`⚠️ fromXmlString not implemented`);
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}
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} catch (error) {
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if (!test.shouldWork) {
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console.log(`✓ ${test.name}: Correctly rejected - ${error.message}`);
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} else {
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console.log(`✗ ${test.name}: Failed unexpectedly - ${error.message}`);
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}
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}
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performanceTracker.recordMetric('special-char-test', performance.now() - startTime);
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}
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performanceTracker.endOperation('special-characters');
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});
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await t.test('Corpus encoding analysis', async () => {
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performanceTracker.startOperation('corpus-encoding');
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const corpusLoader = new CorpusLoader();
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const xmlFiles = await corpusLoader.getFiles(/\.xml$/);
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console.log(`\nAnalyzing encodings in ${xmlFiles.length} XML files...`);
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const encodingStats = {
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total: 0,
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utf8: 0,
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utf8WithBom: 0,
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utf16: 0,
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windows1252: 0,
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iso88591: 0,
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other: 0,
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noDeclaration: 0,
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errors: 0
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};
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const sampleSize = Math.min(100, xmlFiles.length);
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const sampledFiles = xmlFiles.slice(0, sampleSize);
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for (const file of sampledFiles) {
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encodingStats.total++;
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try {
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const buffer = await plugins.fs.readFile(file.path);
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const content = buffer.toString('utf8', 0, Math.min(200, buffer.length));
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// Check for BOM
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if (buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
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encodingStats.utf8WithBom++;
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}
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// Check XML declaration
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const encodingMatch = content.match(/encoding=["']([^"']+)["']/i);
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if (encodingMatch) {
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const encoding = encodingMatch[1].toUpperCase();
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switch (encoding) {
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case 'UTF-8':
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encodingStats.utf8++;
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break;
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case 'UTF-16':
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case 'UTF-16LE':
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case 'UTF-16BE':
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encodingStats.utf16++;
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break;
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case 'WINDOWS-1252':
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case 'CP1252':
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encodingStats.windows1252++;
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break;
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case 'ISO-8859-1':
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case 'LATIN1':
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encodingStats.iso88591++;
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break;
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default:
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encodingStats.other++;
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console.log(` Found unusual encoding: ${encoding} in ${file.name}`);
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}
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} else {
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encodingStats.noDeclaration++;
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}
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} catch (error) {
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encodingStats.errors++;
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}
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}
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console.log('\nEncoding Statistics:');
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console.log(`Total files analyzed: ${encodingStats.total}`);
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console.log(`UTF-8: ${encodingStats.utf8}`);
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console.log(`UTF-8 with BOM: ${encodingStats.utf8WithBom}`);
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console.log(`UTF-16: ${encodingStats.utf16}`);
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console.log(`Windows-1252: ${encodingStats.windows1252}`);
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console.log(`ISO-8859-1: ${encodingStats.iso88591}`);
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console.log(`Other encodings: ${encodingStats.other}`);
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console.log(`No encoding declaration: ${encodingStats.noDeclaration}`);
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console.log(`Read errors: ${encodingStats.errors}`);
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performanceTracker.endOperation('corpus-encoding');
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});
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await t.test('Encoding error recovery', async () => {
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performanceTracker.startOperation('encoding-recovery');
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const recoveryStrategies = [
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{
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name: 'Remove BOM',
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apply: (content: string) => content.replace(/^\uFEFF/, ''),
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test: '\uFEFF<?xml version="1.0"?><invoice></invoice>'
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},
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{
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name: 'Fix encoding declaration',
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apply: (content: string) => {
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return content.replace(
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/encoding=["'][^"']*["']/i,
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'encoding="UTF-8"'
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);
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},
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test: '<?xml version="1.0" encoding="INVALID"?><invoice></invoice>'
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},
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{
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name: 'Remove invalid characters',
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apply: (content: string) => {
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return content.replace(/[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F]/g, '');
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},
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test: '<?xml version="1.0"?><invoice><id>TEST\x00001</id></invoice>'
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},
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{
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name: 'Normalize line endings',
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apply: (content: string) => {
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return content.replace(/\r\n/g, '\n').replace(/\r/g, '\n');
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},
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test: '<?xml version="1.0"?>\r\n<invoice>\r<id>TEST</id>\r\n</invoice>'
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},
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{
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name: 'HTML entity decode',
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apply: (content: string) => {
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return content
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, "'");
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},
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test: '<?xml version="1.0"?><invoice><note>Müller & Co.</note></invoice>'
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}
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];
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for (const strategy of recoveryStrategies) {
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const startTime = performance.now();
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try {
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const recovered = strategy.apply(strategy.test);
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const invoice = new einvoice.EInvoice();
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if (invoice.fromXmlString) {
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await invoice.fromXmlString(recovered);
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console.log(`✓ ${strategy.name}: Recovery successful`);
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} else {
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console.log(`⚠️ ${strategy.name}: Cannot test without fromXmlString`);
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}
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} catch (error) {
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console.log(`✗ ${strategy.name}: Recovery failed - ${error.message}`);
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}
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performanceTracker.recordMetric('recovery-strategy', performance.now() - startTime);
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}
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performanceTracker.endOperation('encoding-recovery');
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});
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// Performance summary
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console.log('\n' + performanceTracker.getSummary());
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// Encoding error handling best practices
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console.log('\nCharacter Encoding Error Handling Best Practices:');
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console.log('1. Always detect encoding before parsing');
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console.log('2. Handle BOM (Byte Order Mark) correctly');
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console.log('3. Validate encoding declaration matches actual encoding');
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console.log('4. Sanitize invalid XML characters');
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console.log('5. Support common legacy encodings (Windows-1252, ISO-8859-1)');
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console.log('6. Provide clear error messages for encoding issues');
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console.log('7. Implement fallback strategies for recovery');
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console.log('8. Normalize text to prevent encoding-related security issues');
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});
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tap.start(); |