feat(contract): add get_protocol_fee_view read-only view method

creator-keys/src/lib.rs

@@ -53,6 +53,18 @@ pub mod fee {
     }
 }
 
+/// Stable, non-optional view of the protocol fee configuration.
+///
+/// Returned by [`CreatorKeysContract::get_protocol_fee_view`] for indexer-friendly consumption.
+/// When `is_configured` is `false`, both bps fields are `0` and no fee config has been stored.
+#[derive(Clone)]
+#[contracttype]
+pub struct ProtocolFeeView {
+    pub creator_bps: u32,
+    pub protocol_bps: u32,
+    pub is_configured: bool,
+}
+
 #[derive(Clone)]
 #[contracttype]
 pub enum DataKey {
@@ -164,6 +176,30 @@ impl CreatorKeysContract {
         env.storage().persistent().get(&DataKey::FeeConfig)
     }
 
+    /// Read-only view: returns the current protocol fee configuration.
+    ///
+    /// Returns a stable [`ProtocolFeeView`] regardless of whether a fee config has been set.
+    /// When no config is stored, `is_configured` is `false` and both bps fields are `0`.
+    /// Use this method for indexers and read-only callers that need a non-optional result.
+    pub fn get_protocol_fee_view(env: Env) -> ProtocolFeeView {
+        match env
+            .storage()
+            .persistent()
+            .get::<DataKey, fee::FeeConfig>(&DataKey::FeeConfig)
+        {
+            Some(config) => ProtocolFeeView {
+                creator_bps: config.creator_bps,
+                protocol_bps: config.protocol_bps,
+                is_configured: true,
+            },
+            None => ProtocolFeeView {
+                creator_bps: 0,
+                protocol_bps: 0,
+                is_configured: false,
+            },
+        }
+    }
+
     pub fn compute_fees_for_payment(env: Env, total: i128) -> (i128, i128) {
         let config: fee::FeeConfig = env
             .storage()

creator-keys/tests/fee_config_view.rs

@@ -0,0 +1,71 @@
+//! Tests for the get_protocol_fee_view read-only method (#19).
+
+use creator_keys::{CreatorKeysContract, CreatorKeysContractClient};
+use soroban_sdk::{testutils::Address as _, Env};
+
+#[test]
+fn test_get_protocol_fee_view_unconfigured_returns_defaults() {
+    let env = Env::default();
+    let contract_id = env.register(CreatorKeysContract, ());
+    let client = CreatorKeysContractClient::new(&env, &contract_id);
+
+    let view = client.get_protocol_fee_view();
+    assert!(!view.is_configured);
+    assert_eq!(view.creator_bps, 0);
+    assert_eq!(view.protocol_bps, 0);
+}
+
+#[test]
+fn test_get_protocol_fee_view_returns_configured_values() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let contract_id = env.register(CreatorKeysContract, ());
+    let client = CreatorKeysContractClient::new(&env, &contract_id);
+    let admin = soroban_sdk::Address::generate(&env);
+
+    client.set_fee_config(&admin, &9000u32, &1000u32);
+
+    let view = client.get_protocol_fee_view();
+    assert!(view.is_configured);
+    assert_eq!(view.creator_bps, 9000);
+    assert_eq!(view.protocol_bps, 1000);
+}
+
+#[test]
+fn test_get_protocol_fee_view_is_read_only() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let contract_id = env.register(CreatorKeysContract, ());
+    let client = CreatorKeysContractClient::new(&env, &contract_id);
+    let admin = soroban_sdk::Address::generate(&env);
+
+    client.set_fee_config(&admin, &8000u32, &2000u32);
+
+    let v1 = client.get_protocol_fee_view();
+    let v2 = client.get_protocol_fee_view();
+
+    assert_eq!(v1.creator_bps, v2.creator_bps);
+    assert_eq!(v1.protocol_bps, v2.protocol_bps);
+    assert_eq!(v1.is_configured, v2.is_configured);
+}
+
+#[test]
+fn test_get_protocol_fee_view_updates_after_reconfiguration() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let contract_id = env.register(CreatorKeysContract, ());
+    let client = CreatorKeysContractClient::new(&env, &contract_id);
+    let admin = soroban_sdk::Address::generate(&env);
+
+    client.set_fee_config(&admin, &9000u32, &1000u32);
+    let v1 = client.get_protocol_fee_view();
+    assert_eq!(v1.protocol_bps, 1000);
+
+    client.set_fee_config(&admin, &8000u32, &2000u32);
+    let v2 = client.get_protocol_fee_view();
+    assert_eq!(v2.protocol_bps, 2000);
+    assert_eq!(v2.creator_bps, 8000);
+}