git.delta.rocks / unique-network / refs/commits / b4ec6cd8c8b0

1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617//! # Nonfungible Pallet18//!19//! The Nonfungible pallet provides functionality for handling nonfungible collections and tokens.20//!21//! - [`Config`]22//! - [`NonfungibleHandle`]23//! - [`Pallet`]24//! - [`CommonWeights`](common::CommonWeights)25//!26//! ## Overview27//!28//! The Nonfungible pallet provides functions for:29//!30//! - NFT collection creation and removal31//! - Minting and burning of NFT tokens32//! - Retrieving account balances33//! - Transfering NFT tokens34//! - Setting and checking allowance for NFT tokens35//! - Setting properties and permissions for NFT collections and tokens36//! - Nesting and unnesting tokens37//!38//! ### Terminology39//!40//! - **NFT token:** Non fungible token.41//!42//! - **NFT Collection:** A collection of NFT tokens. All NFT tokens are part of a collection.43//!   Each collection can define it's own properties, properties for it's tokens and set of permissions.44//!45//! - **Balance:** Number of NFT tokens owned by an account46//!47//! - **Allowance:** NFT tokens owned by one account that another account is allowed to make operations on48//!49//! - **Burning:** The process of “deleting” a token from a collection and from50//!   an account balance of the owner.51//!52//! - **Nesting:** Setting up parent-child relationship between tokens. Nested tokens are inhereting53//!   owner from their parent. There could be multiple levels of nesting. Token couldn't be nested in54//!   it's child token i.e. parent-child relationship graph shouldn't have cycles.55//!56//! - **Properties:** Key-Values pairs. Token properties are attached to a token. Collection properties are57//!   attached to a collection. Set of permissions could be defined for each property.58//!59//! ### Implementations60//!61//! The Nonfungible pallet provides implementations for the following traits. If these traits provide62//! the functionality that you need, then you can avoid coupling with the Nonfungible pallet.63//!64//! - [`CommonWeightInfo`](pallet_common::CommonWeightInfo): Functions for retrieval of transaction weight65//! - [`CommonCollectionOperations`](pallet_common::CommonCollectionOperations): Functions for dealing66//!   with collections67//!68//! ## Interface69//!70//! ### Dispatchable Functions71//!72//! - `init_collection` - Create NFT collection. NFT collection can be configured to allow or deny access for73//!   some accounts.74//! - `destroy_collection` - Destroy exising NFT collection. There should be no tokens in the collection.75//! - `burn` - Burn NFT token owned by account.76//! - `transfer` - Transfer NFT token. Transfers should be enabled for NFT collection.77//!   Nests the NFT token if it is sent to another token.78//! - `create_item` - Mint NFT token in collection. Sender should have permission to mint tokens.79//! - `set_allowance` - Set allowance for another account.80//! - `set_token_property` - Set token property value.81//! - `delete_token_property` - Remove property from the token.82//! - `set_collection_properties` - Set collection properties.83//! - `delete_collection_properties` - Remove properties from the collection.84//! - `set_property_permission` - Set collection property permission.85//! - `set_token_property_permissions` - Set token property permissions.86//!87//! ## Assumptions88//!89//! * To perform operations on tokens sender should be in collection's allow list if collection access mode is `AllowList`.9091#![cfg_attr(not(feature = "std"), no_std)]9293use erc::ERC721Events;94use evm_coder::ToLog;95use frame_support::{96	BoundedVec, ensure, fail, transactional,97	storage::with_transaction,98	pallet_prelude::DispatchResultWithPostInfo,99	pallet_prelude::Weight,100	dispatch::{PostDispatchInfo, Pays},101};102use up_data_structs::{103	AccessMode, CollectionId, CollectionFlags, CustomDataLimit, TokenId, CreateCollectionData,104	CreateNftExData, mapping::TokenAddressMapping, budget::Budget, Property, PropertyKey,105	PropertyValue, PropertyKeyPermission, PropertyScope, TrySetProperty, TokenChild,106	AuxPropertyValue, PropertiesPermissionMap, TokenProperties as TokenPropertiesT,107};108use pallet_evm::{account::CrossAccountId, Pallet as PalletEvm};109use pallet_common::{110	Error as CommonError, Pallet as PalletCommon, Event as CommonEvent, CollectionHandle,111	eth::collection_id_to_address,112};113use pallet_structure::{Pallet as PalletStructure, Error as StructureError};114use pallet_evm_coder_substrate::{SubstrateRecorder, WithRecorder};115use sp_core::{Get, H160};116use sp_runtime::{ArithmeticError, DispatchError, DispatchResult, TransactionOutcome};117use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap};118use core::ops::Deref;119use codec::{Encode, Decode, MaxEncodedLen};120use scale_info::TypeInfo;121122pub use pallet::*;123use weights::WeightInfo;124#[cfg(feature = "runtime-benchmarks")]125pub mod benchmarking;126pub mod common;127pub mod erc;128pub mod weights;129130pub type CreateItemData<T> = CreateNftExData<<T as pallet_evm::Config>::CrossAccountId>;131pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;132133/// Token data, stored independently from other data used to describe it134/// for the convenience of database access. Notably contains the owner account address.135#[struct_versioning::versioned(version = 2, upper)]136#[derive(Encode, Decode, TypeInfo, MaxEncodedLen)]137pub struct ItemData<CrossAccountId> {138	#[version(..2)]139	pub const_data: BoundedVec<u8, CustomDataLimit>,140141	#[version(..2)]142	pub variable_data: BoundedVec<u8, CustomDataLimit>,143144	pub owner: CrossAccountId,145}146147#[frame_support::pallet]148pub mod pallet {149	use super::*;150	use frame_support::{151		Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key, traits::StorageVersion,152	};153	use frame_system::pallet_prelude::*;154	use up_data_structs::{CollectionId, TokenId};155	use super::weights::WeightInfo;156157	#[pallet::error]158	pub enum Error<T> {159		/// Not Nonfungible item data used to mint in Nonfungible collection.160		NotNonfungibleDataUsedToMintFungibleCollectionToken,161		/// Used amount > 1 with NFT162		NonfungibleItemsHaveNoAmount,163		/// Unable to burn NFT with children164		CantBurnNftWithChildren,165	}166167	#[pallet::config]168	pub trait Config:169		frame_system::Config + pallet_common::Config + pallet_structure::Config + pallet_evm::Config170	{171		type WeightInfo: WeightInfo;172	}173174	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);175176	#[pallet::pallet]177	#[pallet::storage_version(STORAGE_VERSION)]178	pub struct Pallet<T>(_);179180	/// Total amount of minted tokens in a collection.181	#[pallet::storage]182	pub type TokensMinted<T: Config> =183		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;184185	/// Amount of burnt tokens in a collection.186	#[pallet::storage]187	pub type TokensBurnt<T: Config> =188		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;189190	/// Token data, used to partially describe a token.191	#[pallet::storage]192	pub type TokenData<T: Config> = StorageNMap<193		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),194		Value = ItemData<T::CrossAccountId>,195		QueryKind = OptionQuery,196	>;197198	/// Map of key-value pairs, describing the metadata of a token.199	#[pallet::storage]200	#[pallet::getter(fn token_properties)]201	pub type TokenProperties<T: Config> = StorageNMap<202		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),203		Value = TokenPropertiesT,204		QueryKind = ValueQuery,205	>;206207	/// Custom data of a token that is serialized to bytes,208	/// primarily reserved for on-chain operations,209	/// normally obscured from the external users.210	///211	/// Auxiliary properties are slightly different from212	/// usual [`TokenProperties`] due to an unlimited number213	/// and separately stored and written-to key-value pairs.214	///215	/// Currently unused.216	#[pallet::storage]217	#[pallet::getter(fn token_aux_property)]218	pub type TokenAuxProperties<T: Config> = StorageNMap<219		Key = (220			Key<Twox64Concat, CollectionId>,221			Key<Twox64Concat, TokenId>,222			Key<Twox64Concat, PropertyScope>,223			Key<Twox64Concat, PropertyKey>,224		),225		Value = AuxPropertyValue,226		QueryKind = OptionQuery,227	>;228229	/// Used to enumerate tokens owned by account.230	#[pallet::storage]231	pub type Owned<T: Config> = StorageNMap<232		Key = (233			Key<Twox64Concat, CollectionId>,234			Key<Blake2_128Concat, T::CrossAccountId>,235			Key<Twox64Concat, TokenId>,236		),237		Value = bool,238		QueryKind = ValueQuery,239	>;240241	/// Used to enumerate token's children.242	#[pallet::storage]243	#[pallet::getter(fn token_children)]244	pub type TokenChildren<T: Config> = StorageNMap<245		Key = (246			Key<Twox64Concat, CollectionId>,247			Key<Twox64Concat, TokenId>,248			Key<Twox64Concat, (CollectionId, TokenId)>,249		),250		Value = bool,251		QueryKind = ValueQuery,252	>;253254	/// Amount of tokens owned by an account in a collection.255	#[pallet::storage]256	pub type AccountBalance<T: Config> = StorageNMap<257		Key = (258			Key<Twox64Concat, CollectionId>,259			Key<Blake2_128Concat, T::CrossAccountId>,260		),261		Value = u32,262		QueryKind = ValueQuery,263	>;264265	/// Allowance set by a token owner for another user to perform one of certain transactions on a token.266	#[pallet::storage]267	pub type Allowance<T: Config> = StorageNMap<268		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),269		Value = T::CrossAccountId,270		QueryKind = OptionQuery,271	>;272273	/// Operator set by a wallet owner that could perform certain transactions on all tokens in the wallet.274	#[pallet::storage]275	pub type CollectionAllowance<T: Config> = StorageNMap<276		Key = (277			Key<Twox64Concat, CollectionId>,278			Key<Blake2_128Concat, T::CrossAccountId>,279			Key<Blake2_128Concat, T::CrossAccountId>,280		),281		Value = bool,282		QueryKind = ValueQuery,283	>;284285	/// Upgrade from the old schema to properties.286	#[pallet::hooks]287	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {288		fn on_runtime_upgrade() -> Weight {289			StorageVersion::new(1).put::<Pallet<T>>();290291			Weight::zero()292		}293	}294}295296pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);297impl<T: Config> NonfungibleHandle<T> {298	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {299		Self(inner)300	}301	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {302		self.0303	}304	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {305		&mut self.0306	}307}308309impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {310	fn recorder(&self) -> &SubstrateRecorder<T> {311		self.0.recorder()312	}313	fn into_recorder(self) -> SubstrateRecorder<T> {314		self.0.into_recorder()315	}316}317impl<T: Config> Deref for NonfungibleHandle<T> {318	type Target = pallet_common::CollectionHandle<T>;319320	fn deref(&self) -> &Self::Target {321		&self.0322	}323}324325impl<T: Config> Pallet<T> {326	/// Get number of NFT tokens in collection.327	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {328		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)329	}330331	/// Check that NFT token exists.332	///333	/// - `token`: Token ID.334	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {335		<TokenData<T>>::contains_key((collection.id, token))336	}337338	/// Set the token property with the scope.339	///340	/// - `property`: Contains key-value pair.341	pub fn set_scoped_token_property(342		collection_id: CollectionId,343		token_id: TokenId,344		scope: PropertyScope,345		property: Property,346	) -> DispatchResult {347		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {348			properties.try_scoped_set(scope, property.key, property.value)349		})350		.map_err(<CommonError<T>>::from)?;351352		Ok(())353	}354355	/// Batch operation to set multiple properties with the same scope.356	pub fn set_scoped_token_properties(357		collection_id: CollectionId,358		token_id: TokenId,359		scope: PropertyScope,360		properties: impl Iterator<Item = Property>,361	) -> DispatchResult {362		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {363			stored_properties.try_scoped_set_from_iter(scope, properties)364		})365		.map_err(<CommonError<T>>::from)?;366367		Ok(())368	}369370	/// Add or edit auxiliary data for the property.371	///372	/// - `f`: function that adds or edits auxiliary data.373	pub fn try_mutate_token_aux_property<R, E>(374		collection_id: CollectionId,375		token_id: TokenId,376		scope: PropertyScope,377		key: PropertyKey,378		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,379	) -> Result<R, E> {380		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)381	}382383	/// Remove auxiliary data for the property.384	pub fn remove_token_aux_property(385		collection_id: CollectionId,386		token_id: TokenId,387		scope: PropertyScope,388		key: PropertyKey,389	) {390		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));391	}392393	/// Get all auxiliary data in a given scope.394	///395	/// Returns iterator over Property Key - Data pairs.396	pub fn iterate_token_aux_properties(397		collection_id: CollectionId,398		token_id: TokenId,399		scope: PropertyScope,400	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {401		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))402	}403404	/// Get ID of the last minted token405	pub fn current_token_id(collection_id: CollectionId) -> TokenId {406		TokenId(<TokensMinted<T>>::get(collection_id))407	}408}409410// unchecked calls skips any permission checks411impl<T: Config> Pallet<T> {412	/// Create NFT collection413	///414	/// `init_collection` will take non-refundable deposit for collection creation.415	///416	/// - `data`: Contains settings for collection limits and permissions.417	pub fn init_collection(418		owner: T::CrossAccountId,419		payer: T::CrossAccountId,420		data: CreateCollectionData<T::AccountId>,421		flags: CollectionFlags,422	) -> Result<CollectionId, DispatchError> {423		<PalletCommon<T>>::init_collection(owner, payer, data, flags)424	}425426	/// Destroy NFT collection427	///428	/// `destroy_collection` will throw error if collection contains any tokens.429	/// Only owner can destroy collection.430	pub fn destroy_collection(431		collection: NonfungibleHandle<T>,432		sender: &T::CrossAccountId,433	) -> DispatchResult {434		let id = collection.id;435436		if Self::collection_has_tokens(id) {437			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());438		}439440		// =========441442		PalletCommon::destroy_collection(collection.0, sender)?;443444		let _ = <TokenData<T>>::clear_prefix((id,), u32::MAX, None);445		let _ = <TokenChildren<T>>::clear_prefix((id,), u32::MAX, None);446		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);447		<TokensMinted<T>>::remove(id);448		<TokensBurnt<T>>::remove(id);449		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);450		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);451		let _ = <CollectionAllowance<T>>::clear_prefix((id,), u32::MAX, None);452		Ok(())453	}454455	/// Burn NFT token456	///457	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token458	/// if the token is nested.459	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.460	/// Also removes all corresponding properties and auxiliary properties.461	///462	/// - `token`: Token that should be burned463	/// - `collection`: Collection that contains the token464	pub fn burn(465		collection: &NonfungibleHandle<T>,466		sender: &T::CrossAccountId,467		token: TokenId,468	) -> DispatchResult {469		let token_data =470			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;471		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);472473		if collection.permissions.access() == AccessMode::AllowList {474			collection.check_allowlist(sender)?;475		}476477		if Self::token_has_children(collection.id, token) {478			return Err(<Error<T>>::CantBurnNftWithChildren.into());479		}480481		let burnt = <TokensBurnt<T>>::get(collection.id)482			.checked_add(1)483			.ok_or(ArithmeticError::Overflow)?;484485		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))486			.checked_sub(1)487			.ok_or(ArithmeticError::Overflow)?;488489		// =========490491		if balance == 0 {492			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));493		} else {494			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);495		}496497		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);498499		<Owned<T>>::remove((collection.id, &token_data.owner, token));500		<TokensBurnt<T>>::insert(collection.id, burnt);501		<TokenData<T>>::remove((collection.id, token));502		<TokenProperties<T>>::remove((collection.id, token));503		let _ = <TokenAuxProperties<T>>::clear_prefix((collection.id, token), u32::MAX, None);504		let old_spender = <Allowance<T>>::take((collection.id, token));505506		if let Some(old_spender) = old_spender {507			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(508				collection.id,509				token,510				token_data.owner.clone(),511				old_spender,512				0,513			));514		}515516		<PalletEvm<T>>::deposit_log(517			ERC721Events::Transfer {518				from: *token_data.owner.as_eth(),519				to: H160::default(),520				token_id: token.into(),521			}522			.to_log(collection_id_to_address(collection.id)),523		);524		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(525			collection.id,526			token,527			token_data.owner,528			1,529		));530		Ok(())531	}532533	/// Same as [`burn`] but burns all the tokens that are nested in the token first534	///535	/// - `self_budget`: Limit for searching children in depth.536	/// - `breadth_budget`: Limit of breadth of searching children.537	///538	/// [`burn`]: struct.Pallet.html#method.burn539	#[transactional]540	pub fn burn_recursively(541		collection: &NonfungibleHandle<T>,542		sender: &T::CrossAccountId,543		token: TokenId,544		self_budget: &dyn Budget,545		breadth_budget: &dyn Budget,546	) -> DispatchResultWithPostInfo {547		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);548549		let current_token_account =550			T::CrossTokenAddressMapping::token_to_address(collection.id, token);551552		let mut weight = Weight::zero();553554		// This method is transactional, if user in fact doesn't have permissions to remove token -555		// tokens removed here will be restored after rejected transaction556		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {557			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);558			let PostDispatchInfo { actual_weight, .. } =559				<PalletStructure<T>>::burn_item_recursively(560					current_token_account.clone(),561					collection,562					token,563					self_budget,564					breadth_budget,565				)?;566			if let Some(actual_weight) = actual_weight {567				weight = weight.saturating_add(actual_weight);568			}569		}570571		Self::burn(collection, sender, token)?;572		DispatchResultWithPostInfo::Ok(PostDispatchInfo {573			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),574			pays_fee: Pays::Yes,575		})576	}577578	/// A batch operation to add, edit or remove properties for a token.579	///580	/// - `nesting_budget`: Limit for searching parents in-depth to check ownership.581	/// - `is_token_create`: Indicates that method is called during token initialization.582	///   Allows to bypass ownership check.583	///584	/// All affected properties should have `mutable` permission585	/// to be **deleted** or to be **set more than once**,586	/// and the sender should have permission to edit those properties.587	///588	/// This function fires an event for each property change.589	/// In case of an error, all the changes (including the events) will be reverted590	/// since the function is transactional.591	#[transactional]592	fn modify_token_properties(593		collection: &NonfungibleHandle<T>,594		sender: &T::CrossAccountId,595		token_id: TokenId,596		properties_updates: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,597		is_token_create: bool,598		nesting_budget: &dyn Budget,599	) -> DispatchResult {600		let is_token_owner = || {601			let is_owned = <PalletStructure<T>>::check_indirectly_owned(602				sender.clone(),603				collection.id,604				token_id,605				None,606				nesting_budget,607			)?;608609			Ok(is_owned)610		};611612		let stored_properties = <TokenProperties<T>>::get((collection.id, token_id));613614		<PalletCommon<T>>::modify_token_properties(615			collection,616			sender,617			token_id,618			properties_updates,619			is_token_create,620			stored_properties,621			is_token_owner,622			|properties| <TokenProperties<T>>::set((collection.id, token_id), properties),623			erc::ERC721TokenEvent::TokenChanged {624				token_id: token_id.into(),625			}626			.to_log(T::ContractAddress::get()),627		)628	}629630	/// Batch operation to add or edit properties for the token631	///632	/// Same as [`modify_token_properties`] but doesn't allow to remove properties633	///634	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties635	pub fn set_token_properties(636		collection: &NonfungibleHandle<T>,637		sender: &T::CrossAccountId,638		token_id: TokenId,639		properties: impl Iterator<Item = Property>,640		is_token_create: bool,641		nesting_budget: &dyn Budget,642	) -> DispatchResult {643		Self::modify_token_properties(644			collection,645			sender,646			token_id,647			properties.map(|p| (p.key, Some(p.value))),648			is_token_create,649			nesting_budget,650		)651	}652653	/// Add or edit single property for the token654	///655	/// Calls [`set_token_properties`] internally656	///657	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties658	pub fn set_token_property(659		collection: &NonfungibleHandle<T>,660		sender: &T::CrossAccountId,661		token_id: TokenId,662		property: Property,663		nesting_budget: &dyn Budget,664	) -> DispatchResult {665		let is_token_create = false;666667		Self::set_token_properties(668			collection,669			sender,670			token_id,671			[property].into_iter(),672			is_token_create,673			nesting_budget,674		)675	}676677	/// Batch operation to remove properties from the token678	///679	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties680	///681	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties682	pub fn delete_token_properties(683		collection: &NonfungibleHandle<T>,684		sender: &T::CrossAccountId,685		token_id: TokenId,686		property_keys: impl Iterator<Item = PropertyKey>,687		nesting_budget: &dyn Budget,688	) -> DispatchResult {689		let is_token_create = false;690691		Self::modify_token_properties(692			collection,693			sender,694			token_id,695			property_keys.into_iter().map(|key| (key, None)),696			is_token_create,697			nesting_budget,698		)699	}700701	/// Remove single property from the token702	///703	/// Calls [`delete_token_properties`] internally704	///705	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties706	pub fn delete_token_property(707		collection: &NonfungibleHandle<T>,708		sender: &T::CrossAccountId,709		token_id: TokenId,710		property_key: PropertyKey,711		nesting_budget: &dyn Budget,712	) -> DispatchResult {713		Self::delete_token_properties(714			collection,715			sender,716			token_id,717			[property_key].into_iter(),718			nesting_budget,719		)720	}721722	/// Add or edit properties for the collection723	pub fn set_collection_properties(724		collection: &NonfungibleHandle<T>,725		sender: &T::CrossAccountId,726		properties: Vec<Property>,727	) -> DispatchResult {728		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())729	}730731	/// Remove properties from the collection732	pub fn delete_collection_properties(733		collection: &CollectionHandle<T>,734		sender: &T::CrossAccountId,735		property_keys: Vec<PropertyKey>,736	) -> DispatchResult {737		<PalletCommon<T>>::delete_collection_properties(738			collection,739			sender,740			property_keys.into_iter(),741		)742	}743744	/// Set property permissions for the token.745	///746	/// Sender should be the owner or admin of token's collection.747	pub fn set_token_property_permissions(748		collection: &CollectionHandle<T>,749		sender: &T::CrossAccountId,750		property_permissions: Vec<PropertyKeyPermission>,751	) -> DispatchResult {752		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)753	}754755	/// Set property permissions for the token with scope.756	///757	/// Sender should be the owner or admin of token's collection.758	pub fn set_scoped_token_property_permissions(759		collection: &CollectionHandle<T>,760		sender: &T::CrossAccountId,761		scope: PropertyScope,762		property_permissions: Vec<PropertyKeyPermission>,763	) -> DispatchResult {764		<PalletCommon<T>>::set_scoped_token_property_permissions(765			collection,766			sender,767			scope,768			property_permissions,769		)770	}771772	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {773		<PalletCommon<T>>::property_permissions(collection_id)774	}775776	pub fn check_token_immediate_ownership(777		collection: &NonfungibleHandle<T>,778		token: TokenId,779		possible_owner: &T::CrossAccountId,780	) -> DispatchResult {781		let token_data =782			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;783		ensure!(784			&token_data.owner == possible_owner,785			<CommonError<T>>::NoPermission786		);787		Ok(())788	}789790	/// Transfer NFT token from one account to another.791	///792	/// `from` account stops being the owner and `to` account becomes the owner of the token.793	/// If `to` is token than `to` becomes owner of the token and the token become nested.794	/// Unnests token from previous parent if it was nested before.795	/// Removes allowance for the token if there was any.796	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.797	///798	/// - `nesting_budget`: Limit for token nesting depth799	pub fn transfer(800		collection: &NonfungibleHandle<T>,801		from: &T::CrossAccountId,802		to: &T::CrossAccountId,803		token: TokenId,804		nesting_budget: &dyn Budget,805	) -> DispatchResult {806		ensure!(807			collection.limits.transfers_enabled(),808			<CommonError<T>>::TransferNotAllowed809		);810811		let token_data =812			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;813		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);814815		if collection.permissions.access() == AccessMode::AllowList {816			collection.check_allowlist(from)?;817			collection.check_allowlist(to)?;818		}819		<PalletCommon<T>>::ensure_correct_receiver(to)?;820821		let balance_from = <AccountBalance<T>>::get((collection.id, from))822			.checked_sub(1)823			.ok_or(<CommonError<T>>::TokenValueTooLow)?;824		let balance_to = if from != to {825			let balance_to = <AccountBalance<T>>::get((collection.id, to))826				.checked_add(1)827				.ok_or(ArithmeticError::Overflow)?;828829			ensure!(830				balance_to < collection.limits.account_token_ownership_limit(),831				<CommonError<T>>::AccountTokenLimitExceeded,832			);833834			Some(balance_to)835		} else {836			None837		};838839		<PalletStructure<T>>::nest_if_sent_to_token(840			from.clone(),841			to,842			collection.id,843			token,844			nesting_budget,845		)?;846847		// =========848849		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);850851		<TokenData<T>>::insert(852			(collection.id, token),853			ItemData {854				owner: to.clone(),855				..token_data856			},857		);858859		if let Some(balance_to) = balance_to {860			// from != to861			if balance_from == 0 {862				<AccountBalance<T>>::remove((collection.id, from));863			} else {864				<AccountBalance<T>>::insert((collection.id, from), balance_from);865			}866			<AccountBalance<T>>::insert((collection.id, to), balance_to);867			<Owned<T>>::remove((collection.id, from, token));868			<Owned<T>>::insert((collection.id, to, token), true);869		}870		Self::set_allowance_unchecked(collection, from, token, None, true);871872		<PalletEvm<T>>::deposit_log(873			ERC721Events::Transfer {874				from: *from.as_eth(),875				to: *to.as_eth(),876				token_id: token.into(),877			}878			.to_log(collection_id_to_address(collection.id)),879		);880		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(881			collection.id,882			token,883			from.clone(),884			to.clone(),885			1,886		));887		Ok(())888	}889890	/// Batch operation to mint multiple NFT tokens.891	///892	/// The sender should be the owner/admin of the collection or collection should be configured893	/// to allow public minting.894	/// Throws if amount of tokens reached it's limit for the collection or if caller reached895	/// token ownership limit.896	///897	/// - `data`: Contains list of token properties and users who will become the owners of the898	///   corresponging tokens.899	/// - `nesting_budget`: Limit for token nesting depth900	pub fn create_multiple_items(901		collection: &NonfungibleHandle<T>,902		sender: &T::CrossAccountId,903		data: Vec<CreateItemData<T>>,904		nesting_budget: &dyn Budget,905	) -> DispatchResult {906		if !collection.is_owner_or_admin(sender) {907			ensure!(908				collection.permissions.mint_mode(),909				<CommonError<T>>::PublicMintingNotAllowed910			);911			collection.check_allowlist(sender)?;912913			for item in data.iter() {914				collection.check_allowlist(&item.owner)?;915			}916		}917918		for data in data.iter() {919			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;920		}921922		let first_token = <TokensMinted<T>>::get(collection.id);923		let tokens_minted = first_token924			.checked_add(data.len() as u32)925			.ok_or(ArithmeticError::Overflow)?;926		ensure!(927			tokens_minted <= collection.limits.token_limit(),928			<CommonError<T>>::CollectionTokenLimitExceeded929		);930931		let mut balances = BTreeMap::new();932		for data in &data {933			let balance = balances934				.entry(&data.owner)935				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));936			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;937938			ensure!(939				*balance <= collection.limits.account_token_ownership_limit(),940				<CommonError<T>>::AccountTokenLimitExceeded,941			);942		}943944		for (i, data) in data.iter().enumerate() {945			let token = TokenId(first_token + i as u32 + 1);946947			<PalletStructure<T>>::check_nesting(948				sender.clone(),949				&data.owner,950				collection.id,951				token,952				nesting_budget,953			)?;954		}955956		// =========957958		with_transaction(|| {959			for (i, data) in data.iter().enumerate() {960				let token = first_token + i as u32 + 1;961962				<TokenData<T>>::insert(963					(collection.id, token),964					ItemData {965						// const_data: data.const_data.clone(),966						owner: data.owner.clone(),967					},968				);969970				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(971					&data.owner,972					collection.id,973					TokenId(token),974				);975976				if let Err(e) = Self::set_token_properties(977					collection,978					sender,979					TokenId(token),980					data.properties.clone().into_iter(),981					true,982					nesting_budget,983				) {984					return TransactionOutcome::Rollback(Err(e));985				}986			}987			TransactionOutcome::Commit(Ok(()))988		})?;989990		<TokensMinted<T>>::insert(collection.id, tokens_minted);991		for (account, balance) in balances {992			<AccountBalance<T>>::insert((collection.id, account), balance);993		}994		for (i, data) in data.into_iter().enumerate() {995			let token = first_token + i as u32 + 1;996			<Owned<T>>::insert((collection.id, &data.owner, token), true);997998			<PalletEvm<T>>::deposit_log(999				ERC721Events::Transfer {1000					from: H160::default(),1001					to: *data.owner.as_eth(),1002					token_id: token.into(),1003				}1004				.to_log(collection_id_to_address(collection.id)),1005			);1006			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1007				collection.id,1008				TokenId(token),1009				data.owner.clone(),1010				1,1011			));1012		}1013		Ok(())1014	}10151016	pub fn set_allowance_unchecked(1017		collection: &NonfungibleHandle<T>,1018		sender: &T::CrossAccountId,1019		token: TokenId,1020		spender: Option<&T::CrossAccountId>,1021		assume_implicit_eth: bool,1022	) {1023		if let Some(spender) = spender {1024			let old_spender = <Allowance<T>>::get((collection.id, token));1025			<Allowance<T>>::insert((collection.id, token), spender);1026			// In ERC721 there is only one possible approved user of token, so we set1027			// approved user to spender1028			<PalletEvm<T>>::deposit_log(1029				ERC721Events::Approval {1030					owner: *sender.as_eth(),1031					approved: *spender.as_eth(),1032					token_id: token.into(),1033				}1034				.to_log(collection_id_to_address(collection.id)),1035			);1036			// In Unique chain, any token can have any amount of approved users, so we need to1037			// set allowance of old owner to 0, and allowance of new owner to 11038			if old_spender.as_ref() != Some(spender) {1039				if let Some(old_owner) = old_spender {1040					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1041						collection.id,1042						token,1043						sender.clone(),1044						old_owner,1045						0,1046					));1047				}1048				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1049					collection.id,1050					token,1051					sender.clone(),1052					spender.clone(),1053					1,1054				));1055			}1056		} else {1057			let old_spender = <Allowance<T>>::take((collection.id, token));1058			if !assume_implicit_eth {1059				// In ERC721 there is only one possible approved user of token, so we set1060				// approved user to zero address1061				<PalletEvm<T>>::deposit_log(1062					ERC721Events::Approval {1063						owner: *sender.as_eth(),1064						approved: H160::default(),1065						token_id: token.into(),1066					}1067					.to_log(collection_id_to_address(collection.id)),1068				);1069			}1070			// In Unique chain, any token can have any amount of approved users, so we need to1071			// set allowance of old owner to 01072			if let Some(old_spender) = old_spender {1073				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1074					collection.id,1075					token,1076					sender.clone(),1077					old_spender,1078					0,1079				));1080			}1081		}1082	}10831084	pub fn get_allowance(1085		collection: &NonfungibleHandle<T>,1086		token_id: TokenId,1087	) -> Result<Option<T::CrossAccountId>, DispatchError> {1088		ensure!(1089			<TokenData<T>>::get((collection.id, token_id)).is_some(),1090			<CommonError<T>>::TokenNotFound1091		);1092		Ok(<Allowance<T>>::get((collection.id, token_id)))1093	}10941095	/// Set allowance for the spender to `transfer` or `burn` sender's token.1096	///1097	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1098	pub fn set_allowance(1099		collection: &NonfungibleHandle<T>,1100		sender: &T::CrossAccountId,1101		token: TokenId,1102		spender: Option<&T::CrossAccountId>,1103	) -> DispatchResult {1104		if collection.permissions.access() == AccessMode::AllowList {1105			collection.check_allowlist(sender)?;1106			if let Some(spender) = spender {1107				collection.check_allowlist(spender)?;1108			}1109		}11101111		if let Some(spender) = spender {1112			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1113		}11141115		let token_data =1116			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1117		if &token_data.owner != sender {1118			ensure!(1119				collection.ignores_owned_amount(sender),1120				<CommonError<T>>::CantApproveMoreThanOwned1121			);1122		}11231124		// =========11251126		Self::set_allowance_unchecked(collection, sender, token, spender, false);1127		Ok(())1128	}11291130	/// Set allowance for the spender to `transfer` or `burn` sender's token from eth mirror.1131	///1132	/// - `from`: Address of sender's eth mirror.1133	/// - `to`: Adress of spender.1134	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1135	pub fn set_allowance_from(1136		collection: &NonfungibleHandle<T>,1137		sender: &T::CrossAccountId,1138		from: &T::CrossAccountId,1139		token: TokenId,1140		to: Option<&T::CrossAccountId>,1141	) -> DispatchResult {1142		if collection.permissions.access() == AccessMode::AllowList {1143			collection.check_allowlist(sender)?;1144			collection.check_allowlist(from)?;1145			if let Some(to) = to {1146				collection.check_allowlist(to)?;1147			}1148		}11491150		if let Some(to) = to {1151			<PalletCommon<T>>::ensure_correct_receiver(to)?;1152		}11531154		ensure!(1155			sender.conv_eq(from),1156			<CommonError<T>>::AddressIsNotEthMirror1157		);11581159		let token_data =1160			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1161		if token_data.owner != *from {1162			ensure!(1163				collection.limits.owner_can_transfer()1164					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from)),1165				<CommonError<T>>::CantApproveMoreThanOwned1166			);1167		}11681169		// =========11701171		Self::set_allowance_unchecked(collection, from, token, to, false);1172		Ok(())1173	}11741175	/// Checks allowance for the spender to use the token.1176	fn check_allowed(1177		collection: &NonfungibleHandle<T>,1178		spender: &T::CrossAccountId,1179		from: &T::CrossAccountId,1180		token: TokenId,1181		nesting_budget: &dyn Budget,1182	) -> DispatchResult {1183		if spender.conv_eq(from) {1184			return Ok(());1185		}1186		if collection.permissions.access() == AccessMode::AllowList {1187			// `from`, `to` checked in [`transfer`]1188			collection.check_allowlist(spender)?;1189		}11901191		if collection.ignores_token_restrictions(spender) {1192			return Ok(());1193		}11941195		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1196			ensure!(1197				<PalletStructure<T>>::check_indirectly_owned(1198					spender.clone(),1199					source.0,1200					source.1,1201					None,1202					nesting_budget1203				)?,1204				<CommonError<T>>::ApprovedValueTooLow,1205			);1206			return Ok(());1207		}1208		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1209			return Ok(());1210		}1211		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1212			return Ok(());1213		}12141215		Err(<CommonError<T>>::ApprovedValueTooLow.into())1216	}12171218	/// Transfer NFT token from one account to another.1219	///1220	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1221	/// The owner should set allowance for the spender to transfer token.1222	///1223	/// [`transfer`]: struct.Pallet.html#method.transfer1224	pub fn transfer_from(1225		collection: &NonfungibleHandle<T>,1226		spender: &T::CrossAccountId,1227		from: &T::CrossAccountId,1228		to: &T::CrossAccountId,1229		token: TokenId,1230		nesting_budget: &dyn Budget,1231	) -> DispatchResult {1232		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12331234		// =========12351236		// Allowance is reset in [`transfer`]1237		Self::transfer(collection, from, to, token, nesting_budget)1238	}12391240	/// Burn NFT token for `from` account.1241	///1242	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1243	/// set allowance for the spender to burn token.1244	///1245	/// [`burn`]: struct.Pallet.html#method.burn1246	pub fn burn_from(1247		collection: &NonfungibleHandle<T>,1248		spender: &T::CrossAccountId,1249		from: &T::CrossAccountId,1250		token: TokenId,1251		nesting_budget: &dyn Budget,1252	) -> DispatchResult {1253		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12541255		// =========12561257		Self::burn(collection, from, token)1258	}12591260	/// Check that `from` token could be nested in `under` token.1261	///1262	pub fn check_nesting(1263		handle: &NonfungibleHandle<T>,1264		sender: T::CrossAccountId,1265		from: (CollectionId, TokenId),1266		under: TokenId,1267		nesting_budget: &dyn Budget,1268	) -> DispatchResult {1269		let nesting = handle.permissions.nesting();12701271		#[cfg(not(feature = "runtime-benchmarks"))]1272		let permissive = false;1273		#[cfg(feature = "runtime-benchmarks")]1274		let permissive = nesting.permissive;12751276		if permissive {1277			ensure!(1278				<TokenData<T>>::contains_key((handle.id, under)),1279				<CommonError<T>>::TokenNotFound1280			);1281		} else if nesting.token_owner1282			&& <PalletStructure<T>>::check_indirectly_owned(1283				sender.clone(),1284				handle.id,1285				under,1286				Some(from),1287				nesting_budget,1288			)? {1289			// Pass, token existence and ouroboros checks are done in `check_indirectly_owned`1290		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1291			// token existence and ouroboros checks are done in `get_checked_topmost_owner`1292			let _ = <PalletStructure<T>>::get_checked_topmost_owner(1293				handle.id,1294				under,1295				Some(from),1296				nesting_budget,1297			)?1298			.ok_or(<CommonError<T>>::TokenNotFound)?;1299		} else {1300			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1301		}13021303		if let Some(whitelist) = &nesting.restricted {1304			ensure!(1305				whitelist.contains(&from.0),1306				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1307			);1308		}1309		Ok(())1310	}13111312	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1313		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1314	}13151316	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1317		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1318	}13191320	fn collection_has_tokens(collection_id: CollectionId) -> bool {1321		<TokenData<T>>::iter_prefix((collection_id,))1322			.next()1323			.is_some()1324	}13251326	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1327		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1328			.next()1329			.is_some()1330	}13311332	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1333		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1334			.map(|((child_collection_id, child_id), _)| TokenChild {1335				collection: child_collection_id,1336				token: child_id,1337			})1338			.collect()1339	}13401341	/// Mint single NFT token.1342	///1343	/// Delegated to [`create_multiple_items`]1344	///1345	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1346	pub fn create_item(1347		collection: &NonfungibleHandle<T>,1348		sender: &T::CrossAccountId,1349		data: CreateItemData<T>,1350		nesting_budget: &dyn Budget,1351	) -> DispatchResult {1352		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1353	}13541355	/// Sets or unsets the approval of a given operator.1356	///1357	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1358	/// - `owner`: Token owner1359	/// - `operator`: Operator1360	/// - `approve`: Should operator status be granted or revoked?1361	pub fn set_allowance_for_all(1362		collection: &NonfungibleHandle<T>,1363		owner: &T::CrossAccountId,1364		operator: &T::CrossAccountId,1365		approve: bool,1366	) -> DispatchResult {1367		<PalletCommon<T>>::set_allowance_for_all(1368			collection,1369			owner,1370			operator,1371			approve,1372			|| <CollectionAllowance<T>>::insert((collection.id, owner, operator), approve),1373			ERC721Events::ApprovalForAll {1374				owner: *owner.as_eth(),1375				operator: *operator.as_eth(),1376				approved: approve,1377			}1378			.to_log(collection_id_to_address(collection.id)),1379		)1380	}13811382	/// Tells whether the given `owner` approves the `operator`.1383	pub fn allowance_for_all(1384		collection: &NonfungibleHandle<T>,1385		owner: &T::CrossAccountId,1386		operator: &T::CrossAccountId,1387	) -> bool {1388		<CollectionAllowance<T>>::get((collection.id, owner, operator))1389	}13901391	pub fn repair_item(collection: &NonfungibleHandle<T>, token: TokenId) -> DispatchResult {1392		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1393			properties.recompute_consumed_space();1394		});13951396		Ok(())1397	}1398}