introduce ip based routing

Rocket.toml

@@ -1,5 +1,6 @@
 [default]
 template_dir = "static/html"
+ip_header = "Proxy-Real-IP"
 
 [debug]
 address = "127.0.0.1"

src/main.rs

@@ -3,6 +3,16 @@
 use rocket::form::Form;
 use rocket_dyn_templates::{Template, context};
 use rocket::fs::FileServer;
+use std::net::{IpAddr, Ipv4Addr};
+
+
+fn ip_to_ipv4(ip: IpAddr) -> Option<Ipv4Addr> {
+    if let IpAddr::V4(v4_addr) = ip {
+        Some(v4_addr)
+    } else {
+        None
+    }
+}
 
 #[derive(FromForm)]
 struct LoginData {
@@ -25,9 +35,18 @@ fn login(login_data: Form<LoginData>) -> Template {
 }
 
 #[get("/")]
-fn index() -> Template {
+fn index(ip: IpAddr) -> Template {
+    if let Some(ipv4) = ip_to_ipv4(ip) {
+        if ipv4.is_private() {
+            Template::render("private_index", context! {})
+        } else {
             Template::render("index", context! {})
         }
+    } else {
+        Template::render("index", context! {})
+    }
+    
+}
 
 #[launch]
 fn rocket() -> _ {