example-qr-generation.ts

import { QRCodeGenerator, ErrorCorrectionLevel } from './src/qr';
import { OtpAuth } from './src/qr';
import { TOTP } from './src/core/totp';

async function demonstrateQRCodeGeneration() {
  console.log('=== QR Code Generation Demo ===\n');

  // Generate a secure secret
  const secret = TOTP.generateSecret(20);
  console.log(`Generated secret: ${secret}\n`);

  // Create TOTP configuration
  const otpauthConfig = {
    label: 'MyApp:user@example.com',
    secret: secret,
    issuer: 'MyApp',
    algorithm: 'sha1' as const,
    digits: 6 as 6 | 7 | 8,
    period: 30
  };

  // Generate otpauth URI
  const otpauthUri = OtpAuth.generateTOTPUri(otpauthConfig);
  console.log(`otpauth URI: ${otpauthUri}\n`);

  // Parse the URI back
  const parsed = OtpAuth.parseUri(otpauthUri);
  console.log('Parsed URI:');
  console.log(`  Type: ${parsed.type}`);
  console.log(`  Label: ${parsed.label}`);
  console.log(`  Secret: ${parsed.params.secret}`);
  console.log(`  Issuer: ${parsed.params.issuer}`);
  console.log(`  Digits: ${parsed.params.digits}`);
  console.log(`  Period: ${parsed.params.period}\n`);

  // Generate QR code as data URI
  console.log('Generating QR code...');
  const qrOptions = {
    otpauth: otpauthConfig,
    width: 300,
    margin: 4,
    errorCorrectionLevel: ErrorCorrectionLevel.MEDIUM,
    color: {
      dark: '#000000',
      light: '#FFFFFF'
    }
  };

  try {
    const qrCode = await QRCodeGenerator.generate(qrOptions);
    console.log(`QR code generated successfully!`);
    console.log(`Data URI length: ${qrCode.dataUri.length} characters`);
    console.log(`Dimensions: ${qrCode.width}x${qrCode.height}px\n`);

    // Generate QR code as SVG
    console.log('Generating QR code as SVG...');
    const svgQRCode = await QRCodeGenerator.generateSVG(qrOptions);
    console.log(`SVG QR code generated successfully!`);
    console.log(`SVG length: ${svgQRCode.length} characters\n`);

    // Generate QR code for terminal
    console.log('Generating QR code for terminal display...');
    const terminalQRCode = await QRCodeGenerator.generateTerminal(qrOptions);
    console.log('Terminal QR code:');
    console.log(terminalQRCode);

    // Calculate QR code version
    const version = await QRCodeGenerator.calculateVersion(qrOptions);
    console.log(`\nQR code version: ${version}`);

  } catch (error) {
    console.error('Error generating QR code:', error);
  }
}

// Run the demonstration
demonstrateQRCodeGeneration().catch(console.error);