we know if a user is logger in so use it

main.go

@@ -22,15 +22,13 @@ func signupPage(res http.ResponseWriter, req *http.Request) {
 			http.Redirect(res, req, "/", 302)
 		} else {
 			data := struct {
-				Title      string
+				Title    string
-				Username   string
+				Username string
-				ShowLogin  bool
+				LoggedIn bool
-				ShowLogout bool
 			}{
 				"Register",
 				"Unregistered",
 				false,
-				false,
 			}
 			tpl.ExecuteTemplate(res, "register", data)
 		}
@@ -71,14 +69,12 @@ func loginPage(res http.ResponseWriter, req *http.Request) {
 			http.Redirect(res, req, "/", 302)
 		} else {
 			data := struct {
-				Title      string
+				Title    string
-				Username   string
+				Username string
-				ShowLogin  bool
+				LoggedIn bool
-				ShowLogout bool
 			}{
 				"Login",
 				"Unregistered",
-				true,
 				false,
 			}
 			tpl.ExecuteTemplate(res, "login", data)
@@ -116,15 +112,13 @@ func tokenPage(res http.ResponseWriter, req *http.Request) {
 		tpl.ExecuteTemplate(res, "error", nil)
 	}
 	data := struct {
-		Title      string
+		Title    string
-		Username   string
+		Username string
-		ShowLogin  bool
+		LoggedIn bool
-		ShowLogout bool
+		Token    string
-		Token      string
 	}{
 		"Token Generation",
 		u,
-		false,
 		true,
 		token,
 	}
@@ -133,20 +127,20 @@ func tokenPage(res http.ResponseWriter, req *http.Request) {
 
 func homePage(res http.ResponseWriter, req *http.Request) {
 	u := getUserName(req)
+	active := false
 	uname := "Unregistered"
 	if u != "" {
 		uname = u
+		active = true
 	}
 	data := struct {
-		Title      string
+		Title    string
-		Username   string
+		Username string
-		ShowLogin  bool
+		LoggedIn bool
-		ShowLogout bool
 	}{
 		"Index",
 		uname,
-		true,
+		active,
-		true,
 	}
 
 	tpl.ExecuteTemplate(res, "index", data)

templates/header.html

@@ -9,7 +9,7 @@
 		<nav>
 			<div style="overflow: hidden;">
 				<p style="float: left;">Logged in as: {{.Username}}</p> 
-				<p style="float: right;"><a href="/">Home</a> {{if .ShowLogin}}<a href="/login">Login</a> {{end}}{{if .ShowLogout}}<a href="/logout">Logout</a>{{end}}</p>
+				<p style="float: right;"><a href="/">Home</a> {{if .LoggedIn}}<a href="/logout">Logout</a> {{else}}<a href="/login">Login</a>{{end}}</p>
 			</div>
 		</nav>
 {{end}}

templates/index.html

@@ -1,6 +1,9 @@
 {{ define "index" }}
 {{ template "header" .}}
-<p><a href="/register">Register</a></p>
+{{if .LoggedIn }}
 <p><a href="/token">Get Token</a></p>
+{{else}}
+<p><a href="/register">Register</a></p>
+{{end}}
 {{template "footer" .}}
 {{ end }}