feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/frame/nfts/src/common_functions.rs

@@ -0,0 +1,81 @@
+// This file is part of Substrate.
+
+// Copyright (C) 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.
+
+//! Various pieces of common functionality.
+
+use crate::*;
+use alloc::vec::Vec;
+use frame_support::pallet_prelude::*;
+
+impl<T: Config<I>, I: 'static> Pallet<T, I> {
+	/// Get the owner of the item, if the item exists.
+	pub fn owner(collection: T::CollectionId, item: T::ItemId) -> Option<T::AccountId> {
+		Item::<T, I>::get(collection, item).map(|i| i.owner)
+	}
+
+	/// Get the owner of the collection, if the collection exists.
+	pub fn collection_owner(collection: T::CollectionId) -> Option<T::AccountId> {
+		Collection::<T, I>::get(collection).map(|i| i.owner)
+	}
+
+	/// Validates the signature of the given data with the provided signer's account ID.
+	///
+	/// # Errors
+	///
+	/// This function returns a [`WrongSignature`](crate::Error::WrongSignature) error if the
+	/// signature is invalid or the verification process fails.
+	pub fn validate_signature(
+		data: &Vec<u8>,
+		signature: &T::OffchainSignature,
+		signer: &T::AccountId,
+	) -> DispatchResult {
+		if signature.verify(&**data, &signer) {
+			return Ok(());
+		}
+
+		// NOTE: for security reasons modern UIs implicitly wrap the data requested to sign into
+		// <Bytes></Bytes>, that's why we support both wrapped and raw versions.
+		let prefix = b"<Bytes>";
+		let suffix = b"</Bytes>";
+		let mut wrapped: Vec<u8> = Vec::with_capacity(data.len() + prefix.len() + suffix.len());
+		wrapped.extend(prefix);
+		wrapped.extend(data);
+		wrapped.extend(suffix);
+
+		ensure!(signature.verify(&*wrapped, &signer), Error::<T, I>::WrongSignature);
+
+		Ok(())
+	}
+
+	pub(crate) fn set_next_collection_id(collection: T::CollectionId) {
+		let next_id = collection.increment();
+		NextCollectionId::<T, I>::set(next_id);
+		Self::deposit_event(Event::NextCollectionIdIncremented { next_id });
+	}
+
+	#[cfg(any(test, feature = "runtime-benchmarks"))]
+	pub fn set_next_id(id: T::CollectionId) {
+		NextCollectionId::<T, I>::set(Some(id));
+	}
+
+	#[cfg(test)]
+	pub fn get_next_id() -> T::CollectionId {
+		NextCollectionId::<T, I>::get()
+			.or(T::CollectionId::initial_value())
+			.expect("Failed to get next collection ID")
+	}
+}