backend: blocked pairing server with duplicate name

gamestream-webtransport-proxy/src/pair.rs

@@ -292,7 +292,11 @@ async fn send_client_pairing_secret(
 
 #[craft]
 impl crate::config::ConfigFile {
-    #[craft(endpoint(status_codes(StatusCode::OK, StatusCode::INTERNAL_SERVER_ERROR)))]
+    #[craft(endpoint(status_codes(
+        StatusCode::OK,
+        StatusCode::BAD_REQUEST,
+        StatusCode::INTERNAL_SERVER_ERROR
+    )))]
     pub async fn post_pair(
         self: ::std::sync::Arc<Self>,
         body: salvo::oapi::extract::JsonBody<PostPairParams>,
@@ -305,6 +309,30 @@ impl crate::config::ConfigFile {
             name: params.name,
         };
 
+        let reader = self.read().await;
+
+        let servers = match reader.servers() {
+            Ok(s) => s,
+            Err(e) => {
+                error!("Could not get servers: {e}");
+                return Err(AppError {
+                    status_code: StatusCode::INTERNAL_SERVER_ERROR,
+                    description: "Pairing failed".to_string(),
+                });
+            }
+        };
+
+        if servers.contains_key(&server.name) {
+            error!(
+                "Could not pair server with name {}, server with that name already exists.",
+                server.name
+            );
+            return Err(AppError {
+                status_code: StatusCode::BAD_REQUEST,
+                description: format!("Server with name {} already exists.", server.name),
+            });
+        }
+
         let unique_id = match self.read().await.unique_id() {
             Ok(u) => u,
             Err(e) => {