dcrouter/test/suite/smtpclient_commands/test.ccmd-08.rset-command.ts

import { tap, expect } from '@git.zone/tstest/tapbundle';
import { startTestSmtpServer } from '../../helpers/server.loader.js';
import { createSmtpClient } from '../../helpers/smtp.client.js';

let testServer: any;

tap.test('setup test SMTP server', async () => {
  testServer = await startTestSmtpServer();
  expect(testServer).toBeTruthy();
  expect(testServer.port).toBeGreaterThan(0);
});

tap.test('CCMD-08: Basic RSET command', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Send RSET command
  const rsetResponse = await smtpClient.sendCommand('RSET');
  
  // Verify response
  expect(rsetResponse).toInclude('250');
  expect(rsetResponse).toMatch(/reset|ok/i);
  
  console.log(`RSET response: ${rsetResponse.trim()}`);

  await smtpClient.close();
});

tap.test('CCMD-08: RSET after MAIL FROM', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Start transaction
  const mailResponse = await smtpClient.sendCommand('MAIL FROM:<sender@example.com>');
  expect(mailResponse).toInclude('250');

  // Reset transaction
  const rsetResponse = await smtpClient.sendCommand('RSET');
  expect(rsetResponse).toInclude('250');

  // Verify transaction was reset by trying RCPT TO without MAIL FROM
  const rcptResponse = await smtpClient.sendCommand('RCPT TO:<recipient@example.com>');
  expect(rcptResponse).toMatch(/[45]\d\d/); // Should fail

  await smtpClient.close();
});

tap.test('CCMD-08: RSET after multiple recipients', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Build up a transaction with multiple recipients
  await smtpClient.sendCommand('MAIL FROM:<sender@example.com>');
  await smtpClient.sendCommand('RCPT TO:<recipient1@example.com>');
  await smtpClient.sendCommand('RCPT TO:<recipient2@example.com>');
  await smtpClient.sendCommand('RCPT TO:<recipient3@example.com>');

  console.log('Transaction built with 3 recipients');

  // Reset the transaction
  const rsetResponse = await smtpClient.sendCommand('RSET');
  expect(rsetResponse).toInclude('250');

  // Start a new transaction to verify reset
  const newMailResponse = await smtpClient.sendCommand('MAIL FROM:<newsender@example.com>');
  expect(newMailResponse).toInclude('250');

  const newRcptResponse = await smtpClient.sendCommand('RCPT TO:<newrecipient@example.com>');
  expect(newRcptResponse).toInclude('250');

  console.log('Successfully started new transaction after RSET');

  await smtpClient.sendCommand('RSET');
  await smtpClient.close();
});

tap.test('CCMD-08: RSET during DATA phase', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Start transaction
  await smtpClient.sendCommand('MAIL FROM:<sender@example.com>');
  await smtpClient.sendCommand('RCPT TO:<recipient@example.com>');
  
  // Enter DATA phase
  const dataResponse = await smtpClient.sendCommand('DATA');
  expect(dataResponse).toInclude('354');

  // Try RSET during DATA (should fail or be queued)
  // Most servers will interpret this as message content
  await smtpClient.sendCommand('RSET');
  
  // Complete the DATA phase
  const endDataResponse = await smtpClient.sendCommand('.');
  expect(endDataResponse).toInclude('250');

  // Now RSET should work
  const rsetResponse = await smtpClient.sendCommand('RSET');
  expect(rsetResponse).toInclude('250');

  await smtpClient.close();
});

tap.test('CCMD-08: Multiple RSET commands', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Send multiple RSET commands
  for (let i = 0; i < 5; i++) {
    const rsetResponse = await smtpClient.sendCommand('RSET');
    expect(rsetResponse).toInclude('250');
    console.log(`RSET ${i + 1}: ${rsetResponse.trim()}`);
  }

  // Should still be able to start a transaction
  const mailResponse = await smtpClient.sendCommand('MAIL FROM:<sender@example.com>');
  expect(mailResponse).toInclude('250');

  await smtpClient.sendCommand('RSET');
  await smtpClient.close();
});

tap.test('CCMD-08: RSET with pipelining', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    enablePipelining: true,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Pipeline commands including RSET
  const pipelinedCommands = [
    smtpClient.sendCommand('MAIL FROM:<sender@example.com>'),
    smtpClient.sendCommand('RCPT TO:<recipient@example.com>'),
    smtpClient.sendCommand('RSET'),
    smtpClient.sendCommand('MAIL FROM:<newsender@example.com>'),
    smtpClient.sendCommand('RCPT TO:<newrecipient@example.com>')
  ];

  const responses = await Promise.all(pipelinedCommands);

  // Check responses
  expect(responses[0]).toInclude('250'); // MAIL FROM
  expect(responses[1]).toInclude('250'); // RCPT TO
  expect(responses[2]).toInclude('250'); // RSET
  expect(responses[3]).toInclude('250'); // New MAIL FROM
  expect(responses[4]).toInclude('250'); // New RCPT TO

  console.log('Successfully pipelined commands with RSET');

  await smtpClient.sendCommand('RSET');
  await smtpClient.close();
});

tap.test('CCMD-08: RSET state verification', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: true
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  // Build complex state
  await smtpClient.sendCommand('MAIL FROM:<sender@example.com> SIZE=1000');
  await smtpClient.sendCommand('RCPT TO:<recipient1@example.com>');
  await smtpClient.sendCommand('RCPT TO:<recipient2@example.com>');

  console.log('Built transaction state with SIZE parameter and 2 recipients');

  // Reset
  const rsetResponse = await smtpClient.sendCommand('RSET');
  expect(rsetResponse).toInclude('250');

  // Verify all state is cleared
  // 1. Can't add recipients without MAIL FROM
  const rcptResponse = await smtpClient.sendCommand('RCPT TO:<test@example.com>');
  expect(rcptResponse).toMatch(/[45]\d\d/);

  // 2. Can start fresh transaction
  const newMailResponse = await smtpClient.sendCommand('MAIL FROM:<different@example.com>');
  expect(newMailResponse).toInclude('250');

  // 3. Previous recipients are not remembered
  const dataResponse = await smtpClient.sendCommand('DATA');
  expect(dataResponse).toMatch(/[45]\d\d/); // Should fail - no recipients

  await smtpClient.sendCommand('RSET');
  await smtpClient.close();
});

tap.test('CCMD-08: RSET performance impact', async () => {
  const smtpClient = createSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    connectionTimeout: 5000,
    debug: false // Quiet for performance test
  });

  await smtpClient.connect();
  await smtpClient.sendCommand('EHLO testclient.example.com');

  const iterations = 20;
  const times: number[] = [];

  for (let i = 0; i < iterations; i++) {
    // Build transaction
    await smtpClient.sendCommand('MAIL FROM:<sender@example.com>');
    await smtpClient.sendCommand('RCPT TO:<recipient@example.com>');
    
    // Measure RSET time
    const startTime = Date.now();
    await smtpClient.sendCommand('RSET');
    const elapsed = Date.now() - startTime;
    
    times.push(elapsed);
  }

  // Analyze RSET performance
  const avgTime = times.reduce((a, b) => a + b, 0) / times.length;
  const minTime = Math.min(...times);
  const maxTime = Math.max(...times);

  console.log(`RSET performance over ${iterations} iterations:`);
  console.log(`  Average: ${avgTime.toFixed(2)}ms`);
  console.log(`  Min: ${minTime}ms`);
  console.log(`  Max: ${maxTime}ms`);

  // RSET should be fast
  expect(avgTime).toBeLessThan(100);

  await smtpClient.close();
});

tap.test('cleanup test SMTP server', async () => {
  if (testServer) {
    await testServer.stop();
  }
});

export default tap.start();