Add inspect trait for asset roles (#11738)

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/frame/support/src/traits/tokens/fungibles.rs

@@ -31,6 +31,7 @@ pub mod metadata;
 pub use balanced::{Balanced, Unbalanced};
 mod imbalance;
 pub use imbalance::{CreditOf, DebtOf, HandleImbalanceDrop, Imbalance};
+pub mod roles;
 
 /// Trait for providing balance-inspection access to a set of named fungible assets.
 pub trait Inspect<AccountId> {

substrate/frame/support/src/traits/tokens/fungibles/roles.rs

@@ -0,0 +1,29 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2019-2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Inspect traits for Asset roles
+
+pub trait Inspect<AccountId>: super::Inspect<AccountId> {
+	// Get owner for an AssetId.
+	fn owner(asset: Self::AssetId) -> Option<AccountId>;
+	// Get issuer for an AssetId.
+	fn issuer(asset: Self::AssetId) -> Option<AccountId>;
+	// Get admin for an AssetId.
+	fn admin(asset: Self::AssetId) -> Option<AccountId>;
+	// Get freezer for an AssetId.
+	fn freezer(asset: Self::AssetId) -> Option<AccountId>;
+}