update structure

ts/forwarding/handlers/https-terminate-to-http-handler.ts

@@ -0,0 +1,264 @@
+import * as plugins from '../../plugins.js';
+import { ForwardingHandler } from './base-handler.js';
+import type { ForwardConfig } from '../config/forwarding-types.js';
+import { ForwardingHandlerEvents } from '../config/forwarding-types.js';
+
+/**
+ * Handler for HTTPS termination with HTTP backend
+ */
+export class HttpsTerminateToHttpHandler extends ForwardingHandler {
+  private tlsServer: plugins.tls.Server | null = null;
+  private secureContext: plugins.tls.SecureContext | null = null;
+  
+  /**
+   * Create a new HTTPS termination with HTTP backend handler
+   * @param config The forwarding configuration
+   */
+  constructor(config: ForwardConfig) {
+    super(config);
+    
+    // Validate that this is an HTTPS terminate to HTTP configuration
+    if (config.type !== 'https-terminate-to-http') {
+      throw new Error(`Invalid configuration type for HttpsTerminateToHttpHandler: ${config.type}`);
+    }
+  }
+  
+  /**
+   * Initialize the handler, setting up TLS context
+   */
+  public async initialize(): Promise<void> {
+    // We need to load or create TLS certificates
+    if (this.config.https?.customCert) {
+      // Use custom certificate from configuration
+      this.secureContext = plugins.tls.createSecureContext({
+        key: this.config.https.customCert.key,
+        cert: this.config.https.customCert.cert
+      });
+      
+      this.emit(ForwardingHandlerEvents.CERTIFICATE_LOADED, {
+        source: 'config',
+        domain: this.config.target.host
+      });
+    } else if (this.config.acme?.enabled) {
+      // Request certificate through ACME if needed
+      this.emit(ForwardingHandlerEvents.CERTIFICATE_NEEDED, {
+        domain: Array.isArray(this.config.target.host) 
+          ? this.config.target.host[0] 
+          : this.config.target.host,
+        useProduction: this.config.acme.production || false
+      });
+      
+      // In a real implementation, we would wait for the certificate to be issued
+      // For now, we'll use a dummy context
+      this.secureContext = plugins.tls.createSecureContext({
+        key: '-----BEGIN PRIVATE KEY-----\nDummy key\n-----END PRIVATE KEY-----',
+        cert: '-----BEGIN CERTIFICATE-----\nDummy cert\n-----END CERTIFICATE-----'
+      });
+    } else {
+      throw new Error('HTTPS termination requires either a custom certificate or ACME enabled');
+    }
+  }
+  
+  /**
+   * Set the secure context for TLS termination
+   * Called when a certificate is available
+   * @param context The secure context
+   */
+  public setSecureContext(context: plugins.tls.SecureContext): void {
+    this.secureContext = context;
+  }
+  
+  /**
+   * Handle a TLS/SSL socket connection by terminating TLS and forwarding to HTTP backend
+   * @param clientSocket The incoming socket from the client
+   */
+  public handleConnection(clientSocket: plugins.net.Socket): void {
+    // Make sure we have a secure context
+    if (!this.secureContext) {
+      clientSocket.destroy(new Error('TLS secure context not initialized'));
+      return;
+    }
+    
+    const remoteAddress = clientSocket.remoteAddress || 'unknown';
+    const remotePort = clientSocket.remotePort || 0;
+    
+    // Create a TLS socket using our secure context
+    const tlsSocket = new plugins.tls.TLSSocket(clientSocket, {
+      secureContext: this.secureContext,
+      isServer: true,
+      server: this.tlsServer || undefined
+    });
+    
+    this.emit(ForwardingHandlerEvents.CONNECTED, {
+      remoteAddress,
+      remotePort,
+      tls: true
+    });
+    
+    // Handle TLS errors
+    tlsSocket.on('error', (error) => {
+      this.emit(ForwardingHandlerEvents.ERROR, {
+        remoteAddress,
+        error: `TLS error: ${error.message}`
+      });
+      
+      if (!tlsSocket.destroyed) {
+        tlsSocket.destroy();
+      }
+    });
+    
+    // The TLS socket will now emit HTTP traffic that can be processed
+    // In a real implementation, we would create an HTTP parser and handle
+    // the requests here, but for simplicity, we'll just log the data
+    
+    let dataBuffer = Buffer.alloc(0);
+    
+    tlsSocket.on('data', (data) => {
+      // Append to buffer
+      dataBuffer = Buffer.concat([dataBuffer, data]);
+      
+      // Very basic HTTP parsing - in a real implementation, use http-parser
+      if (dataBuffer.includes(Buffer.from('\r\n\r\n'))) {
+        const target = this.getTargetFromConfig();
+        
+        // Simple example: forward the data to an HTTP server
+        const socket = plugins.net.connect(target.port, target.host, () => {
+          socket.write(dataBuffer);
+          dataBuffer = Buffer.alloc(0);
+          
+          // Set up bidirectional data flow
+          tlsSocket.pipe(socket);
+          socket.pipe(tlsSocket);
+        });
+        
+        socket.on('error', (error) => {
+          this.emit(ForwardingHandlerEvents.ERROR, {
+            remoteAddress,
+            error: `Target connection error: ${error.message}`
+          });
+          
+          if (!tlsSocket.destroyed) {
+            tlsSocket.destroy();
+          }
+        });
+      }
+    });
+    
+    // Handle close
+    tlsSocket.on('close', () => {
+      this.emit(ForwardingHandlerEvents.DISCONNECTED, {
+        remoteAddress
+      });
+    });
+    
+    // Set timeout
+    const timeout = this.getTimeout();
+    tlsSocket.setTimeout(timeout);
+    
+    tlsSocket.on('timeout', () => {
+      this.emit(ForwardingHandlerEvents.ERROR, {
+        remoteAddress,
+        error: 'TLS connection timeout'
+      });
+      
+      if (!tlsSocket.destroyed) {
+        tlsSocket.destroy();
+      }
+    });
+  }
+  
+  /**
+   * Handle an HTTP request by forwarding to the HTTP backend
+   * @param req The HTTP request
+   * @param res The HTTP response
+   */
+  public handleHttpRequest(req: plugins.http.IncomingMessage, res: plugins.http.ServerResponse): void {
+    // Check if we should redirect to HTTPS
+    if (this.config.http?.redirectToHttps) {
+      this.redirectToHttps(req, res);
+      return;
+    }
+    
+    // Get the target from configuration
+    const target = this.getTargetFromConfig();
+    
+    // Create custom headers with variable substitution
+    const variables = {
+      clientIp: req.socket.remoteAddress || 'unknown'
+    };
+    
+    // Prepare headers, merging with any custom headers from config
+    const headers = this.applyCustomHeaders(req.headers, variables);
+    
+    // Create the proxy request options
+    const options = {
+      hostname: target.host,
+      port: target.port,
+      path: req.url,
+      method: req.method,
+      headers
+    };
+    
+    // Create the proxy request
+    const proxyReq = plugins.http.request(options, (proxyRes) => {
+      // Copy status code and headers from the proxied response
+      res.writeHead(proxyRes.statusCode || 500, proxyRes.headers);
+      
+      // Pipe the proxy response to the client response
+      proxyRes.pipe(res);
+      
+      // Track response size for logging
+      let responseSize = 0;
+      proxyRes.on('data', (chunk) => {
+        responseSize += chunk.length;
+      });
+      
+      proxyRes.on('end', () => {
+        this.emit(ForwardingHandlerEvents.HTTP_RESPONSE, {
+          statusCode: proxyRes.statusCode,
+          headers: proxyRes.headers,
+          size: responseSize
+        });
+      });
+    });
+    
+    // Handle errors in the proxy request
+    proxyReq.on('error', (error) => {
+      this.emit(ForwardingHandlerEvents.ERROR, {
+        remoteAddress: req.socket.remoteAddress,
+        error: `Proxy request error: ${error.message}`
+      });
+      
+      // Send an error response if headers haven't been sent yet
+      if (!res.headersSent) {
+        res.writeHead(502, { 'Content-Type': 'text/plain' });
+        res.end(`Error forwarding request: ${error.message}`);
+      } else {
+        // Just end the response if headers have already been sent
+        res.end();
+      }
+    });
+    
+    // Track request details for logging
+    let requestSize = 0;
+    req.on('data', (chunk) => {
+      requestSize += chunk.length;
+    });
+    
+    // Log the request
+    this.emit(ForwardingHandlerEvents.HTTP_REQUEST, {
+      method: req.method,
+      url: req.url,
+      headers: req.headers,
+      remoteAddress: req.socket.remoteAddress,
+      target: `${target.host}:${target.port}`
+    });
+    
+    // Pipe the client request to the proxy request
+    if (req.readable) {
+      req.pipe(proxyReq);
+    } else {
+      proxyReq.end();
+    }
+  }
+}