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// 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")
}
}