feat(spike): cross-chain nonfungible implementation

integration-tests/src/chains/pop_network/mod.rs

@@ -27,6 +27,7 @@ decl_test_parachains! {
 		pallets = {
 			PolkadotXcm: runtime::PolkadotXcm,
 			Balances: runtime::Balances,
+			ForeignNfts: runtime::ForeignNfts,
 		}
 	},
 }

pallets/nfts/README.md

@@ -51,7 +51,9 @@ The NFTs pallet in Substrate is designed to make the following possible:
 * `transfer`: Send an item to a new owner.
 * `redeposit`: Update the deposit amount of an item, potentially freeing funds.
 * `approve_transfer`: Name a delegate who may authorize a transfer.
+* `approve_collection_transfer`: Name a delegate who may authorize a transfer of all collection items owned by the account.
 * `cancel_approval`: Revert the effects of a previous `approve_transfer`.
+* `cancel_collection_transfer`: Revert the effects of a previous `approve_collection_transfer`.
 * `approve_item_attributes`: Name a delegate who may change item's attributes within a namespace.
 * `cancel_item_attributes_approval`: Revert the effects of a previous `approve_item_attributes`.
 * `set_price`: Set the price for an item.
@@ -70,6 +72,7 @@ The NFTs pallet in Substrate is designed to make the following possible:
 * `lock_item_transfer`: Prevent an individual item from being transferred.
 * `unlock_item_transfer`: Revert the effects of a previous `lock_item_transfer`.
 * `clear_all_transfer_approvals`: Clears all transfer approvals set by calling the `approve_transfer`.
+* `clear_collection_approvals`: Clears collection approvals set by calling the `approve_collection_transfer`.
 * `lock_collection`: Prevent all items within a collection from being transferred (making them all `soul bound`).
 * `lock_item_properties`: Lock item's metadata or attributes.
 * `transfer_ownership`: Alter the owner of a collection, moving all associated deposits. (Ownership of individual items
@@ -95,6 +98,9 @@ The NFTs pallet in Substrate is designed to make the following possible:
 * `force_collection_owner`: Change collection's owner.
 * `force_collection_config`: Change collection's config.
 * `force_set_attribute`: Set an attribute.
+* `force_approve_collection_transfer`: Name a delegate who may authorize a transfer of all collection items owned by the specified account.
+* `force_cancel_collection_transfer`: Revert the effects of a previous `approve_collection_transfer`.
+* `force_clear_collection_approvals`: Reverts the effects of all previous `approve_collection_transfer` calls for the collection.
 
 Please refer to the [`Call`](https://paritytech.github.io/substrate/master/pallet_nfts/pallet/enum.Call.html) enum and
 its associated variants for documentation on each function.

pallets/nfts/src/common_functions.rs

@@ -25,15 +25,38 @@ use crate::*;
 
 impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	/// Get the owner of the item, if the item exists.
+	///
+	/// - `collection`: The identifier of the collection.
+	/// - `item`: The identifier of the collection item.
 	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.
+	///
+	/// - `collection`: The identifier of the collection.
 	pub fn collection_owner(collection: T::CollectionId) -> Option<T::AccountId> {
 		Collection::<T, I>::get(collection).map(|i| i.owner)
 	}
 
+	/// Get the total number of items in the collection, if the collection exists.
+	///
+	/// - `collection`: The identifier of the collection.
+	pub fn collection_items(collection: T::CollectionId) -> Option<u32> {
+		Collection::<T, I>::get(collection).map(|i| i.items)
+	}
+
+	/// Get the metadata of the collection item.
+	///
+	/// - `collection`: The identifier of the collection.
+	/// - `item`: The identifier of the collection item.
+	pub fn item_metadata(
+		collection: T::CollectionId,
+		item: T::ItemId,
+	) -> Option<BoundedVec<u8, T::StringLimit>> {
+		ItemMetadataOf::<T, I>::get(collection, item).map(|metadata| metadata.data)
+	}
+
 	/// Validates the signature of the given data with the provided signer's account ID.
 	///
 	/// # Errors
@@ -46,7 +69,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		signer: &T::AccountId,
 	) -> DispatchResult {
 		if signature.verify(&**data, signer) {
-			return Ok(())
+			return Ok(());
 		}
 
 		// NOTE: for security reasons modern UIs implicitly wrap the data requested to sign into
@@ -65,7 +88,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 
 	pub(crate) fn set_next_collection_id(collection: T::CollectionId) {
 		let next_id = collection.increment();
-		NextCollectionId::<T, I>::set(next_id);
+		NextCollectionId::<T, I>::set(next_id.clone());
 		Self::deposit_event(Event::NextCollectionIdIncremented { next_id });
 	}