Add support for ListAuthenticators operation

Signed-off-by: Joe Ellis <joe.ellis@arm.com>

src/core/basic_client.rs

@@ -4,6 +4,9 @@
 use super::operation_client::OperationClient;
 use crate::auth::AuthenticationData;
 use crate::error::{ClientErrorKind, Error, Result};
+use parsec_interface::operations::list_authenticators::{
+    AuthenticatorInfo, Operation as ListAuthenticators,
+};
 use parsec_interface::operations::list_opcodes::Operation as ListOpcodes;
 use parsec_interface::operations::list_providers::{Operation as ListProviders, ProviderInfo};
 use parsec_interface::operations::ping::Operation as Ping;
@@ -241,6 +244,22 @@ impl BasicClient {
         }
     }
 
+    /// **[Core Operation]** List the authenticators that are supported by the service.
+    pub fn list_authenticators(&self) -> Result<Vec<AuthenticatorInfo>> {
+        let res = self.op_client.process_operation(
+            NativeOperation::ListAuthenticators(ListAuthenticators {}),
+            ProviderID::Core,
+            &self.auth_data,
+        )?;
+        if let NativeResult::ListAuthenticators(res) = res {
+            Ok(res.authenticators)
+        } else {
+            // Should really not be reached given the checks we do, but it's not impossible if some
+            // changes happen in the interface
+            Err(Error::Client(ClientErrorKind::InvalidServiceResponseType))
+        }
+    }
+
     /// **[Core Operation]** Send a ping request to the service.
     ///
     /// This operation is intended for testing connectivity to the