add: util ip endpoint

src/routes.rs

@@ -43,6 +43,7 @@ pub fn routes() -> Router {
         .route("/{slug}", get(view_request))
         .route("/{slug}/edit", get(editor_request))
         // api
+        .route("/api/v1/util/ip", get(util_ip))
         .route("/api/v1/render", post(render_request))
         .route("/api/v1/entries", post(create_request))
         .route("/api/v1/entries/{slug}", post(edit_request))
@@ -286,6 +287,15 @@ async fn exists_request(
     })
 }
 
+async fn util_ip(headers: HeaderMap) -> impl IntoResponse {
+    headers
+        .get(var("REAL_IP_HEADER").unwrap_or("CF-Connecting-IP".to_string()))
+        .unwrap_or(&HeaderValue::from_static(""))
+        .to_str()
+        .unwrap_or("")
+        .to_string()
+}
+
 #[derive(Deserialize)]
 struct CreateEntry {
     content: String,