lsp_plugin: refactor lsps0listprotocols handler

diff --git a/plugins/lsps-plugin/src/lsps0/handler.rs b/plugins/lsps-plugin/src/lsps0/handler.rs
new file mode 100644
index 00000000..6b552f47
--- /dev/null
+++ b/plugins/lsps-plugin/src/lsps0/handler.rs
@@ -0,0 +1,90 @@
+use crate::{
+    jsonrpc::{server::RequestHandler, JsonRpcResponse, RequestObject, RpcError},
+    lsps0::model::{Lsps0listProtocolsRequest, Lsps0listProtocolsResponse},
+    util::unwrap_payload_with_peer_id,
+};
+use async_trait::async_trait;
+
+pub struct Lsps0ListProtocolsHandler {
+    pub lsps2_enabled: bool,
+}
+
+#[async_trait]
+impl RequestHandler for Lsps0ListProtocolsHandler {
+    async fn handle(&self, payload: &[u8]) -> core::result::Result<Vec<u8>, RpcError> {
+        let (payload, _) = unwrap_payload_with_peer_id(payload);
+
+        let req: RequestObject<Lsps0listProtocolsRequest> =
+            serde_json::from_slice(&payload).unwrap();
+        if let Some(id) = req.id {
+            let mut protocols = vec![];
+            if self.lsps2_enabled {
+                protocols.push(2);
+            }
+            let res = Lsps0listProtocolsResponse { protocols }.into_response(id);
+            let res_vec = serde_json::to_vec(&res).unwrap();
+            return Ok(res_vec);
+        }
+        // If request has no ID (notification), return empty Ok result.
+        Ok(vec![])
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::{
+        jsonrpc::{JsonRpcRequest, ResponseObject},
+        util::wrap_payload_with_peer_id,
+    };
+    use cln_rpc::primitives::PublicKey;
+
+    const PUBKEY: [u8; 33] = [
+        0x02, 0x79, 0xbe, 0x66, 0x7e, 0xf9, 0xdc, 0xbb, 0xac, 0x55, 0xa0, 0x62, 0x95, 0xce, 0x87,
+        0x0b, 0x07, 0x02, 0x9b, 0xfc, 0xdb, 0x2d, 0xce, 0x28, 0xd9, 0x59, 0xf2, 0x81, 0x5b, 0x16,
+        0xf8, 0x17, 0x98,
+    ];
+
+    fn create_peer_id() -> PublicKey {
+        PublicKey::from_slice(&PUBKEY).expect("Valid pubkey")
+    }
+
+    fn create_wrapped_request(request: &RequestObject<Lsps0listProtocolsRequest>) -> Vec<u8> {
+        let payload = serde_json::to_vec(request).expect("Failed to serialize request");
+        wrap_payload_with_peer_id(&payload, create_peer_id())
+    }
+
+    #[tokio::test]
+    async fn test_lsps2_disabled_returns_empty_protocols() {
+        let handler = Lsps0ListProtocolsHandler {
+            lsps2_enabled: false,
+        };
+
+        let request = Lsps0listProtocolsRequest {}.into_request(Some("test-id".to_string()));
+        let payload = create_wrapped_request(&request);
+
+        let result = handler.handle(&payload).await.unwrap();
+        let response: ResponseObject<Lsps0listProtocolsResponse> =
+            serde_json::from_slice(&result).unwrap();
+
+        let data = response.into_inner().expect("Should have result data");
+        assert!(data.protocols.is_empty());
+    }
+
+    #[tokio::test]
+    async fn test_lsps2_enabled_returns_protocol_2() {
+        let handler = Lsps0ListProtocolsHandler {
+            lsps2_enabled: true,
+        };
+
+        let request = Lsps0listProtocolsRequest {}.into_request(Some("test-id".to_string()));
+        let payload = create_wrapped_request(&request);
+
+        let result = handler.handle(&payload).await.unwrap();
+        let response: ResponseObject<Lsps0listProtocolsResponse> =
+            serde_json::from_slice(&result).unwrap();
+
+        let data = response.into_inner().expect("Should have result data");
+        assert_eq!(data.protocols, vec![2]);
+    }
+}
diff --git a/plugins/lsps-plugin/src/lsps0/mod.rs b/plugins/lsps-plugin/src/lsps0/mod.rs
index df78189c..f32b0a55 100644
--- a/plugins/lsps-plugin/src/lsps0/mod.rs
+++ b/plugins/lsps-plugin/src/lsps0/mod.rs
@@ -1,3 +1,4 @@
+pub mod handler;
 pub mod model;
 pub mod primitives;
 pub mod transport;
diff --git a/plugins/lsps-plugin/src/service.rs b/plugins/lsps-plugin/src/service.rs
index 6e3a578f..116e13f2 100644
--- a/plugins/lsps-plugin/src/service.rs
+++ b/plugins/lsps-plugin/src/service.rs
@@ -1,9 +1,10 @@
 use anyhow::anyhow;
 use async_trait::async_trait;
-use cln_lsps::jsonrpc::server::{JsonRpcResponseWriter, RequestHandler};
+use cln_lsps::jsonrpc::server::JsonRpcResponseWriter;
+use cln_lsps::jsonrpc::TransportError;
 use cln_lsps::jsonrpc::{server::JsonRpcServer, JsonRpcRequest};
-use cln_lsps::jsonrpc::{JsonRpcResponse, RequestObject, RpcError, TransportError};
-use cln_lsps::lsps0::model::{Lsps0listProtocolsRequest, Lsps0listProtocolsResponse};
+use cln_lsps::lsps0::handler::Lsps0ListProtocolsHandler;
+use cln_lsps::lsps0::model::Lsps0listProtocolsRequest;
 use cln_lsps::lsps0::transport::{self, CustomMsg};
 use cln_lsps::util::wrap_payload_with_peer_id;
 use cln_lsps::{lsps0, util, LSP_FEATURE_BIT};
@@ -51,7 +52,9 @@ async fn main() -> Result<(), anyhow::Error> {
 
         let lsps_builder = JsonRpcServer::builder().with_handler(
             Lsps0listProtocolsRequest::METHOD.to_string(),
-            Arc::new(Lsps0ListProtocolsHandler {}),
+            Arc::new(Lsps0ListProtocolsHandler {
+                lsps2_enabled: false,
+            }),
         );
         let lsps_service = lsps_builder.build();
 
@@ -115,19 +118,3 @@ impl JsonRpcResponseWriter for LspsResponseWriter {
         transport::send_custommsg(&mut client, payload.to_vec(), self.peer_id).await
     }
 }
-
-pub struct Lsps0ListProtocolsHandler;
-
-#[async_trait]
-impl RequestHandler for Lsps0ListProtocolsHandler {
-    async fn handle(&self, payload: &[u8]) -> core::result::Result<Vec<u8>, RpcError> {
-        let req: RequestObject<Lsps0listProtocolsRequest> =
-            serde_json::from_slice(payload).unwrap();
-        if let Some(id) = req.id {
-            let res = Lsps0listProtocolsResponse { protocols: vec![] }.into_response(id);
-            let res_vec = serde_json::to_vec(&res).unwrap();
-            return Ok(res_vec);
-        }
-        Ok(vec![])
-    }
-}