update structure

ts/forwarding/factory/forwarding-factory.ts

@@ -0,0 +1,156 @@
+import type { ForwardConfig } from '../config/forwarding-types.js';
+import type { ForwardingHandler } from '../handlers/base-handler.js';
+import { HttpForwardingHandler } from '../handlers/http-handler.js';
+import { HttpsPassthroughHandler } from '../handlers/https-passthrough-handler.js';
+import { HttpsTerminateToHttpHandler } from '../handlers/https-terminate-to-http-handler.js';
+import { HttpsTerminateToHttpsHandler } from '../handlers/https-terminate-to-https-handler.js';
+
+/**
+ * Factory for creating forwarding handlers based on the configuration type
+ */
+export class ForwardingHandlerFactory {
+  /**
+   * Create a forwarding handler based on the configuration
+   * @param config The forwarding configuration
+   * @returns The appropriate forwarding handler
+   */
+  public static createHandler(config: ForwardConfig): ForwardingHandler {
+    // Create the appropriate handler based on the forwarding type
+    switch (config.type) {
+      case 'http-only':
+        return new HttpForwardingHandler(config);
+        
+      case 'https-passthrough':
+        return new HttpsPassthroughHandler(config);
+        
+      case 'https-terminate-to-http':
+        return new HttpsTerminateToHttpHandler(config);
+        
+      case 'https-terminate-to-https':
+        return new HttpsTerminateToHttpsHandler(config);
+        
+      default:
+        // Type system should prevent this, but just in case:
+        throw new Error(`Unknown forwarding type: ${(config as any).type}`);
+    }
+  }
+  
+  /**
+   * Apply default values to a forwarding configuration based on its type
+   * @param config The original forwarding configuration
+   * @returns A configuration with defaults applied
+   */
+  public static applyDefaults(config: ForwardConfig): ForwardConfig {
+    // Create a deep copy of the configuration
+    const result: ForwardConfig = JSON.parse(JSON.stringify(config));
+    
+    // Apply defaults based on forwarding type
+    switch (config.type) {
+      case 'http-only':
+        // Set defaults for HTTP-only mode
+        result.http = {
+          enabled: true,
+          ...config.http
+        };
+        break;
+        
+      case 'https-passthrough':
+        // Set defaults for HTTPS passthrough
+        result.https = {
+          forwardSni: true,
+          ...config.https
+        };
+        // SNI forwarding doesn't do HTTP
+        result.http = {
+          enabled: false,
+          ...config.http
+        };
+        break;
+        
+      case 'https-terminate-to-http':
+        // Set defaults for HTTPS termination to HTTP
+        result.https = {
+          ...config.https
+        };
+        // Support HTTP access by default in this mode
+        result.http = {
+          enabled: true,
+          redirectToHttps: true,
+          ...config.http
+        };
+        // Enable ACME by default
+        result.acme = {
+          enabled: true,
+          maintenance: true,
+          ...config.acme
+        };
+        break;
+        
+      case 'https-terminate-to-https':
+        // Similar to terminate-to-http but with different target handling
+        result.https = {
+          ...config.https
+        };
+        result.http = {
+          enabled: true,
+          redirectToHttps: true,
+          ...config.http
+        };
+        result.acme = {
+          enabled: true,
+          maintenance: true,
+          ...config.acme
+        };
+        break;
+    }
+    
+    return result;
+  }
+  
+  /**
+   * Validate a forwarding configuration
+   * @param config The configuration to validate
+   * @throws Error if the configuration is invalid
+   */
+  public static validateConfig(config: ForwardConfig): void {
+    // Validate common properties
+    if (!config.target) {
+      throw new Error('Forwarding configuration must include a target');
+    }
+    
+    if (!config.target.host || (Array.isArray(config.target.host) && config.target.host.length === 0)) {
+      throw new Error('Target must include a host or array of hosts');
+    }
+    
+    if (!config.target.port || config.target.port <= 0 || config.target.port > 65535) {
+      throw new Error('Target must include a valid port (1-65535)');
+    }
+    
+    // Type-specific validation
+    switch (config.type) {
+      case 'http-only':
+        // HTTP-only needs http.enabled to be true
+        if (config.http?.enabled === false) {
+          throw new Error('HTTP-only forwarding must have HTTP enabled');
+        }
+        break;
+        
+      case 'https-passthrough':
+        // HTTPS passthrough doesn't support HTTP
+        if (config.http?.enabled === true) {
+          throw new Error('HTTPS passthrough does not support HTTP');
+        }
+        
+        // HTTPS passthrough doesn't work with ACME
+        if (config.acme?.enabled === true) {
+          throw new Error('HTTPS passthrough does not support ACME');
+        }
+        break;
+        
+      case 'https-terminate-to-http':
+      case 'https-terminate-to-https':
+        // These modes support all options, nothing specific to validate
+        break;
+    }
+  }
+}

ts/forwarding/factory/index.ts

@@ -0,0 +1,5 @@
+/**
+ * Forwarding factory implementations
+ */
+
+export { ForwardingHandlerFactory } from './forwarding-factory.js';