add ip=true optional parameter

cmd/whoami/main.go

@@ -6,6 +6,7 @@ import (
 	"encoding/base32"
 	"strings"
 	"flag"
+	"log"
 )
 
 // define tld
@@ -14,12 +15,17 @@ var tld = flag.String("tld", "mesh.cat", "The top level domain for our network")
 // domainFromIP derives a meshname subdomain for the authoritative DNS server address
 func domainFromIP(target net.IP) string {
 	host := strings.ToLower(base32.StdEncoding.EncodeToString(target)[0:26])
-	domain := strings.Join([]string{host, ".", *tld, "\n"}, "")
+	domain := host + "." + *tld
 	return domain
 }
 
 // handle HTTP requests
 func handler(w http.ResponseWriter, r *http.Request) {
+	// parse query parameters
+	params := r.URL.Query()
+	ipParam := params.Get("ip")
+	// check if the "ip" query parameter is set to "true"
+	showIP := ipParam == "true"
 	// get client's ip address
 	ip, port, err := net.SplitHostPort(r.RemoteAddr)
 	_, _ = port, err	
@@ -31,7 +37,13 @@ func handler(w http.ResponseWriter, r *http.Request) {
 	parsedIP := net.ParseIP(ip)
 	// return domain for IPv6 only
 	if parsedIP.To4() == nil {
-		w.Write([]byte(domainFromIP(parsedIP)))
+		if (showIP) {
+			w.Write([]byte(ip + "\n"))
+		} else {
+			w.Write([]byte(domainFromIP(parsedIP) + "\n"))
+		}
+		log.Println(showIP)
+		log.Println(ip)
 	} else {
 		// set the response status code to 422
 		w.WriteHeader(http.StatusUnprocessableEntity)
@@ -49,7 +61,7 @@ func main() {
 	// parse the command-line arguments
 	flag.Parse()
 	// construct listening address
-	listenAddr := strings.Join([]string{*address, ":", *port}, "")
+	listenAddr := *address + ":" + *port
 	print("Listening on address: ", listenAddr, "\n")
 	// start server
 	http.ListenAndServe(listenAddr, nil)