feat: add ElectrumClient::server_features method

bdk-ffi/src/bdk.udl

@@ -1066,6 +1066,18 @@ interface ElectrumClient {
 
   [Throws=ElectrumError]
   string broadcast([ByRef] Transaction transaction);
+
+  [Throws=ElectrumError]
+  ServerFeaturesRes server_features();
+};
+
+dictionary ServerFeaturesRes {
+  string server_version;
+  string genesis_hash;
+  string protocol_min;
+  string protocol_max;
+  string? hash_function;
+  i64? pruning;
 };
 
 // ------------------------------------------------------------------------

bdk-ffi/src/electrum.rs

@@ -7,11 +7,14 @@ use bdk_core::spk_client::FullScanRequest as BdkFullScanRequest;
 use bdk_core::spk_client::FullScanResponse as BdkFullScanResponse;
 use bdk_core::spk_client::SyncRequest as BdkSyncRequest;
 use bdk_core::spk_client::SyncResponse as BdkSyncResponse;
+use bdk_electrum::electrum_client::ServerFeaturesRes as BdkServerFeaturesRes;
 use bdk_electrum::BdkElectrumClient as BdkBdkElectrumClient;
 use bdk_wallet::bitcoin::Transaction as BdkTransaction;
 use bdk_wallet::KeychainKind;
 use bdk_wallet::Update as BdkUpdate;
 
+use bdk_core::bitcoin::hex::{Case, DisplayHex};
+use bdk_electrum::electrum_client::ElectrumApi;
 use std::collections::BTreeMap;
 use std::sync::Arc;
 
@@ -93,4 +96,34 @@ impl ElectrumClient {
             .map_err(ElectrumError::from)
             .map(|txid| txid.to_string())
     }
+
+    pub fn server_features(&self) -> Result<ServerFeaturesRes, ElectrumError> {
+        self.0
+            .inner
+            .server_features()
+            .map_err(ElectrumError::from)
+            .map(ServerFeaturesRes::from)
+    }
+}
+
+pub struct ServerFeaturesRes {
+    pub server_version: String,
+    pub genesis_hash: String,
+    pub protocol_min: String,
+    pub protocol_max: String,
+    pub hash_function: Option<String>,
+    pub pruning: Option<i64>,
+}
+
+impl From<BdkServerFeaturesRes> for ServerFeaturesRes {
+    fn from(value: BdkServerFeaturesRes) -> ServerFeaturesRes {
+        ServerFeaturesRes {
+            server_version: value.server_version,
+            genesis_hash: value.genesis_hash.to_hex_string(Case::Lower),
+            protocol_min: value.protocol_min,
+            protocol_max: value.protocol_max,
+            hash_function: value.hash_function,
+            pruning: value.pruning,
+        }
+    }
 }

bdk-ffi/src/lib.rs

@@ -17,6 +17,7 @@ use crate::bitcoin::TxIn;
 use crate::bitcoin::TxOut;
 use crate::descriptor::Descriptor;
 use crate::electrum::ElectrumClient;
+use crate::electrum::ServerFeaturesRes;
 use crate::error::AddressParseError;
 use crate::error::Bip32Error;
 use crate::error::Bip39Error;