feat: implement security logging system

src/lib/security/logger.test.ts

@@ -0,0 +1,49 @@
+import { SecurityLogger, SecurityEventType } from './logger';
+
+describe('Security Logging System', () => {
+  let logger: SecurityLogger;
+
+  beforeEach(() => {
+    logger = new SecurityLogger();
+  });
+
+  test('should log security events', () => {
+    logger.logEvent({
+      type: SecurityEventType.CAPTCHA_FAILED,
+      ip: '192.168.1.1',
+      email: 'test@example.com',
+      details: { reason: 'Invalid answer' },
+    });
+
+    const logs = logger.getRecentLogs(10);
+    expect(logs.length).toBe(1);
+    expect(logs[0].type).toBe(SecurityEventType.CAPTCHA_FAILED);
+  });
+
+  test('should detect suspicious activity', () => {
+    for (let i = 0; i < 6; i++) {
+      logger.logEvent({
+        type: SecurityEventType.CAPTCHA_FAILED,
+        ip: '192.168.1.2',
+        email: 'suspicious@example.com',
+        details: {},
+      });
+    }
+
+    const suspiciousIPs = logger.getSuspiciousIPs();
+    expect(suspiciousIPs).toContain('192.168.1.2');
+  });
+
+  test('should clear old logs', () => {
+    logger.logEvent({
+      type: SecurityEventType.RATE_LIMIT_EXCEEDED,
+      ip: '192.168.1.3',
+      details: {},
+    });
+
+    logger.clearOldLogs(0);
+
+    const logs = logger.getRecentLogs(10);
+    expect(logs.length).toBe(0);
+  });
+});