BREAKING CHANGE(smartproxy): Remove legacy migration utilities and deprecated forwarding helpers; consolidate route utilities, streamline interface definitions, and normalize IPv6-mapped IPv4 addresses

ts/forwarding/handlers/base-handler.ts

@@ -55,17 +55,37 @@ export abstract class ForwardingHandler extends plugins.EventEmitter implements
       const randomIndex = Math.floor(Math.random() * target.host.length);
       return {
         host: target.host[randomIndex],
-        port: target.port
+        port: this.resolvePort(target.port)
       };
     }
     
     // Single host
     return {
       host: target.host,
-      port: target.port
+      port: this.resolvePort(target.port)
     };
   }
   
+  /**
+   * Resolves a port value, handling 'preserve' and function ports
+   */
+  protected resolvePort(port: number | 'preserve' | ((ctx: any) => number)): number {
+    if (typeof port === 'function') {
+      try {
+        // Create a minimal context for the function
+        const ctx = { port: 80 }; // Default port for minimal context
+        return port(ctx);
+      } catch (err) {
+        console.error('Error resolving port function:', err);
+        return 80; // Default fallback port
+      }
+    } else if (port === 'preserve') {
+      return 80; // Default port for 'preserve' in base handler
+    } else {
+      return port;
+    }
+  }
+
   /**
    * Redirect an HTTP request to HTTPS
    * @param req The HTTP request