Add authentication middleware to HTTP handlers

auth/auth.go

@@ -0,0 +1,31 @@
+package auth
+
+import (
+	"net/http"
+	"strconv"
+)
+
+type Authenticator struct {
+}
+
+func (a *Authenticator) Authenticate(in http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		c := http.Cookie{
+			Name: "RequestCounter",
+		}
+		cookie, err := r.Cookie("RequestCounter")
+		if err != nil {
+			cookie = &http.Cookie{
+				Value: "0",
+			}
+		}
+		count, err := strconv.Atoi(cookie.Value)
+		if err != nil {
+			c.Value = "1"
+		} else {
+			c.Value = strconv.Itoa(count + 1)
+		}
+		http.SetCookie(w, &c)
+		in(w, r)
+	}
+}