git.delta.rocks / unique-network / refs/commits / 81e4404a75c5

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	>;284}285286pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);287impl<T: Config> NonfungibleHandle<T> {288	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {289		Self(inner)290	}291	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {292		self.0293	}294	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {295		&mut self.0296	}297}298299impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {300	fn recorder(&self) -> &SubstrateRecorder<T> {301		self.0.recorder()302	}303	fn into_recorder(self) -> SubstrateRecorder<T> {304		self.0.into_recorder()305	}306}307impl<T: Config> Deref for NonfungibleHandle<T> {308	type Target = pallet_common::CollectionHandle<T>;309310	fn deref(&self) -> &Self::Target {311		&self.0312	}313}314315impl<T: Config> Pallet<T> {316	/// Get number of NFT tokens in collection.317	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {318		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)319	}320321	/// Check that NFT token exists.322	///323	/// - `token`: Token ID.324	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {325		<TokenData<T>>::contains_key((collection.id, token))326	}327328	/// Set the token property with the scope.329	///330	/// - `property`: Contains key-value pair.331	pub fn set_scoped_token_property(332		collection_id: CollectionId,333		token_id: TokenId,334		scope: PropertyScope,335		property: Property,336	) -> DispatchResult {337		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {338			properties.try_scoped_set(scope, property.key, property.value)339		})340		.map_err(<CommonError<T>>::from)?;341342		Ok(())343	}344345	/// Batch operation to set multiple properties with the same scope.346	pub fn set_scoped_token_properties(347		collection_id: CollectionId,348		token_id: TokenId,349		scope: PropertyScope,350		properties: impl Iterator<Item = Property>,351	) -> DispatchResult {352		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {353			stored_properties.try_scoped_set_from_iter(scope, properties)354		})355		.map_err(<CommonError<T>>::from)?;356357		Ok(())358	}359360	/// Add or edit auxiliary data for the property.361	///362	/// - `f`: function that adds or edits auxiliary data.363	pub fn try_mutate_token_aux_property<R, E>(364		collection_id: CollectionId,365		token_id: TokenId,366		scope: PropertyScope,367		key: PropertyKey,368		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,369	) -> Result<R, E> {370		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)371	}372373	/// Remove auxiliary data for the property.374	pub fn remove_token_aux_property(375		collection_id: CollectionId,376		token_id: TokenId,377		scope: PropertyScope,378		key: PropertyKey,379	) {380		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));381	}382383	/// Get all auxiliary data in a given scope.384	///385	/// Returns iterator over Property Key - Data pairs.386	pub fn iterate_token_aux_properties(387		collection_id: CollectionId,388		token_id: TokenId,389		scope: PropertyScope,390	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {391		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))392	}393394	/// Get ID of the last minted token395	pub fn current_token_id(collection_id: CollectionId) -> TokenId {396		TokenId(<TokensMinted<T>>::get(collection_id))397	}398}399400// unchecked calls skips any permission checks401impl<T: Config> Pallet<T> {402	/// Create NFT collection403	///404	/// `init_collection` will take non-refundable deposit for collection creation.405	///406	/// - `data`: Contains settings for collection limits and permissions.407	pub fn init_collection(408		owner: T::CrossAccountId,409		payer: T::CrossAccountId,410		data: CreateCollectionData<T::AccountId>,411		flags: CollectionFlags,412	) -> Result<CollectionId, DispatchError> {413		<PalletCommon<T>>::init_collection(owner, payer, data, flags)414	}415416	/// Destroy NFT collection417	///418	/// `destroy_collection` will throw error if collection contains any tokens.419	/// Only owner can destroy collection.420	pub fn destroy_collection(421		collection: NonfungibleHandle<T>,422		sender: &T::CrossAccountId,423	) -> DispatchResult {424		let id = collection.id;425426		if Self::collection_has_tokens(id) {427			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());428		}429430		// =========431432		PalletCommon::destroy_collection(collection.0, sender)?;433434		let _ = <TokenData<T>>::clear_prefix((id,), u32::MAX, None);435		let _ = <TokenChildren<T>>::clear_prefix((id,), u32::MAX, None);436		let _ = <Owned<T>>::clear_prefix((id,), u32::MAX, None);437		<TokensMinted<T>>::remove(id);438		<TokensBurnt<T>>::remove(id);439		let _ = <Allowance<T>>::clear_prefix((id,), u32::MAX, None);440		let _ = <AccountBalance<T>>::clear_prefix((id,), u32::MAX, None);441		let _ = <CollectionAllowance<T>>::clear_prefix((id,), u32::MAX, None);442		Ok(())443	}444445	/// Burn NFT token446	///447	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token448	/// if the token is nested.449	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.450	/// Also removes all corresponding properties and auxiliary properties.451	///452	/// - `token`: Token that should be burned453	/// - `collection`: Collection that contains the token454	pub fn burn(455		collection: &NonfungibleHandle<T>,456		sender: &T::CrossAccountId,457		token: TokenId,458	) -> DispatchResult {459		let token_data =460			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;461		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);462463		if collection.permissions.access() == AccessMode::AllowList {464			collection.check_allowlist(sender)?;465		}466467		if Self::token_has_children(collection.id, token) {468			return Err(<Error<T>>::CantBurnNftWithChildren.into());469		}470471		let burnt = <TokensBurnt<T>>::get(collection.id)472			.checked_add(1)473			.ok_or(ArithmeticError::Overflow)?;474475		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))476			.checked_sub(1)477			.ok_or(ArithmeticError::Overflow)?;478479		// =========480481		if balance == 0 {482			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));483		} else {484			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);485		}486487		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);488489		<Owned<T>>::remove((collection.id, &token_data.owner, token));490		<TokensBurnt<T>>::insert(collection.id, burnt);491		<TokenData<T>>::remove((collection.id, token));492		<TokenProperties<T>>::remove((collection.id, token));493		let _ = <TokenAuxProperties<T>>::clear_prefix((collection.id, token), u32::MAX, None);494		let old_spender = <Allowance<T>>::take((collection.id, token));495496		if let Some(old_spender) = old_spender {497			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(498				collection.id,499				token,500				token_data.owner.clone(),501				old_spender,502				0,503			));504		}505506		<PalletEvm<T>>::deposit_log(507			ERC721Events::Transfer {508				from: *token_data.owner.as_eth(),509				to: H160::default(),510				token_id: token.into(),511			}512			.to_log(collection_id_to_address(collection.id)),513		);514		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(515			collection.id,516			token,517			token_data.owner,518			1,519		));520		Ok(())521	}522523	/// Same as [`burn`] but burns all the tokens that are nested in the token first524	///525	/// - `self_budget`: Limit for searching children in depth.526	/// - `breadth_budget`: Limit of breadth of searching children.527	///528	/// [`burn`]: struct.Pallet.html#method.burn529	#[transactional]530	pub fn burn_recursively(531		collection: &NonfungibleHandle<T>,532		sender: &T::CrossAccountId,533		token: TokenId,534		self_budget: &dyn Budget,535		breadth_budget: &dyn Budget,536	) -> DispatchResultWithPostInfo {537		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);538539		let current_token_account =540			T::CrossTokenAddressMapping::token_to_address(collection.id, token);541542		let mut weight = Weight::zero();543544		// This method is transactional, if user in fact doesn't have permissions to remove token -545		// tokens removed here will be restored after rejected transaction546		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {547			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);548			let PostDispatchInfo { actual_weight, .. } =549				<PalletStructure<T>>::burn_item_recursively(550					current_token_account.clone(),551					collection,552					token,553					self_budget,554					breadth_budget,555				)?;556			if let Some(actual_weight) = actual_weight {557				weight = weight.saturating_add(actual_weight);558			}559		}560561		Self::burn(collection, sender, token)?;562		DispatchResultWithPostInfo::Ok(PostDispatchInfo {563			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),564			pays_fee: Pays::Yes,565		})566	}567568	/// A batch operation to add, edit or remove properties for a token.569	///570	/// - `nesting_budget`: Limit for searching parents in-depth to check ownership.571	/// - `is_token_create`: Indicates that method is called during token initialization.572	///   Allows to bypass ownership check.573	///574	/// All affected properties should have `mutable` permission575	/// to be **deleted** or to be **set more than once**,576	/// and the sender should have permission to edit those properties.577	///578	/// This function fires an event for each property change.579	/// In case of an error, all the changes (including the events) will be reverted580	/// since the function is transactional.581	#[transactional]582	fn modify_token_properties(583		collection: &NonfungibleHandle<T>,584		sender: &T::CrossAccountId,585		token_id: TokenId,586		properties_updates: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,587		is_token_create: bool,588		nesting_budget: &dyn Budget,589	) -> DispatchResult {590		let is_token_owner = || {591			let is_owned = <PalletStructure<T>>::check_indirectly_owned(592				sender.clone(),593				collection.id,594				token_id,595				None,596				nesting_budget,597			)?;598599			Ok(is_owned)600		};601602		let stored_properties = <TokenProperties<T>>::get((collection.id, token_id));603604		<PalletCommon<T>>::modify_token_properties(605			collection,606			sender,607			token_id,608			properties_updates,609			is_token_create,610			stored_properties,611			is_token_owner,612			|properties| <TokenProperties<T>>::set((collection.id, token_id), properties),613			erc::ERC721TokenEvent::TokenChanged {614				token_id: token_id.into(),615			}616			.to_log(T::ContractAddress::get()),617		)618	}619620	/// Batch operation to add or edit properties for the token621	///622	/// Same as [`modify_token_properties`] but doesn't allow to remove properties623	///624	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties625	pub fn set_token_properties(626		collection: &NonfungibleHandle<T>,627		sender: &T::CrossAccountId,628		token_id: TokenId,629		properties: impl Iterator<Item = Property>,630		is_token_create: bool,631		nesting_budget: &dyn Budget,632	) -> DispatchResult {633		Self::modify_token_properties(634			collection,635			sender,636			token_id,637			properties.map(|p| (p.key, Some(p.value))),638			is_token_create,639			nesting_budget,640		)641	}642643	/// Add or edit single property for the token644	///645	/// Calls [`set_token_properties`] internally646	///647	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties648	pub fn set_token_property(649		collection: &NonfungibleHandle<T>,650		sender: &T::CrossAccountId,651		token_id: TokenId,652		property: Property,653		nesting_budget: &dyn Budget,654	) -> DispatchResult {655		let is_token_create = false;656657		Self::set_token_properties(658			collection,659			sender,660			token_id,661			[property].into_iter(),662			is_token_create,663			nesting_budget,664		)665	}666667	/// Batch operation to remove properties from the token668	///669	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties670	///671	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties672	pub fn delete_token_properties(673		collection: &NonfungibleHandle<T>,674		sender: &T::CrossAccountId,675		token_id: TokenId,676		property_keys: impl Iterator<Item = PropertyKey>,677		nesting_budget: &dyn Budget,678	) -> DispatchResult {679		let is_token_create = false;680681		Self::modify_token_properties(682			collection,683			sender,684			token_id,685			property_keys.into_iter().map(|key| (key, None)),686			is_token_create,687			nesting_budget,688		)689	}690691	/// Remove single property from the token692	///693	/// Calls [`delete_token_properties`] internally694	///695	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties696	pub fn delete_token_property(697		collection: &NonfungibleHandle<T>,698		sender: &T::CrossAccountId,699		token_id: TokenId,700		property_key: PropertyKey,701		nesting_budget: &dyn Budget,702	) -> DispatchResult {703		Self::delete_token_properties(704			collection,705			sender,706			token_id,707			[property_key].into_iter(),708			nesting_budget,709		)710	}711712	/// Add or edit properties for the collection713	pub fn set_collection_properties(714		collection: &NonfungibleHandle<T>,715		sender: &T::CrossAccountId,716		properties: Vec<Property>,717	) -> DispatchResult {718		<PalletCommon<T>>::set_collection_properties(collection, sender, properties.into_iter())719	}720721	/// Remove properties from the collection722	pub fn delete_collection_properties(723		collection: &CollectionHandle<T>,724		sender: &T::CrossAccountId,725		property_keys: Vec<PropertyKey>,726	) -> DispatchResult {727		<PalletCommon<T>>::delete_collection_properties(728			collection,729			sender,730			property_keys.into_iter(),731		)732	}733734	/// Set property permissions for the token.735	///736	/// Sender should be the owner or admin of token's collection.737	pub fn set_token_property_permissions(738		collection: &CollectionHandle<T>,739		sender: &T::CrossAccountId,740		property_permissions: Vec<PropertyKeyPermission>,741	) -> DispatchResult {742		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)743	}744745	/// Set property permissions for the token with scope.746	///747	/// Sender should be the owner or admin of token's collection.748	pub fn set_scoped_token_property_permissions(749		collection: &CollectionHandle<T>,750		sender: &T::CrossAccountId,751		scope: PropertyScope,752		property_permissions: Vec<PropertyKeyPermission>,753	) -> DispatchResult {754		<PalletCommon<T>>::set_scoped_token_property_permissions(755			collection,756			sender,757			scope,758			property_permissions,759		)760	}761762	pub fn token_property_permission(collection_id: CollectionId) -> PropertiesPermissionMap {763		<PalletCommon<T>>::property_permissions(collection_id)764	}765766	pub fn check_token_immediate_ownership(767		collection: &NonfungibleHandle<T>,768		token: TokenId,769		possible_owner: &T::CrossAccountId,770	) -> DispatchResult {771		let token_data =772			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;773		ensure!(774			&token_data.owner == possible_owner,775			<CommonError<T>>::NoPermission776		);777		Ok(())778	}779780	/// Transfer NFT token from one account to another.781	///782	/// `from` account stops being the owner and `to` account becomes the owner of the token.783	/// If `to` is token than `to` becomes owner of the token and the token become nested.784	/// Unnests token from previous parent if it was nested before.785	/// Removes allowance for the token if there was any.786	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.787	///788	/// - `nesting_budget`: Limit for token nesting depth789	pub fn transfer(790		collection: &NonfungibleHandle<T>,791		from: &T::CrossAccountId,792		to: &T::CrossAccountId,793		token: TokenId,794		nesting_budget: &dyn Budget,795	) -> DispatchResult {796		ensure!(797			collection.limits.transfers_enabled(),798			<CommonError<T>>::TransferNotAllowed799		);800801		let token_data =802			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;803		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);804805		if collection.permissions.access() == AccessMode::AllowList {806			collection.check_allowlist(from)?;807			collection.check_allowlist(to)?;808		}809		<PalletCommon<T>>::ensure_correct_receiver(to)?;810811		let balance_from = <AccountBalance<T>>::get((collection.id, from))812			.checked_sub(1)813			.ok_or(<CommonError<T>>::TokenValueTooLow)?;814		let balance_to = if from != to {815			let balance_to = <AccountBalance<T>>::get((collection.id, to))816				.checked_add(1)817				.ok_or(ArithmeticError::Overflow)?;818819			ensure!(820				balance_to < collection.limits.account_token_ownership_limit(),821				<CommonError<T>>::AccountTokenLimitExceeded,822			);823824			Some(balance_to)825		} else {826			None827		};828829		<PalletStructure<T>>::nest_if_sent_to_token(830			from.clone(),831			to,832			collection.id,833			token,834			nesting_budget,835		)?;836837		// =========838839		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);840841		<TokenData<T>>::insert(842			(collection.id, token),843			ItemData {844				owner: to.clone(),845				..token_data846			},847		);848849		if let Some(balance_to) = balance_to {850			// from != to851			if balance_from == 0 {852				<AccountBalance<T>>::remove((collection.id, from));853			} else {854				<AccountBalance<T>>::insert((collection.id, from), balance_from);855			}856			<AccountBalance<T>>::insert((collection.id, to), balance_to);857			<Owned<T>>::remove((collection.id, from, token));858			<Owned<T>>::insert((collection.id, to, token), true);859		}860		Self::set_allowance_unchecked(collection, from, token, None, true);861862		<PalletEvm<T>>::deposit_log(863			ERC721Events::Transfer {864				from: *from.as_eth(),865				to: *to.as_eth(),866				token_id: token.into(),867			}868			.to_log(collection_id_to_address(collection.id)),869		);870		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(871			collection.id,872			token,873			from.clone(),874			to.clone(),875			1,876		));877		Ok(())878	}879880	/// Batch operation to mint multiple NFT tokens.881	///882	/// The sender should be the owner/admin of the collection or collection should be configured883	/// to allow public minting.884	/// Throws if amount of tokens reached it's limit for the collection or if caller reached885	/// token ownership limit.886	///887	/// - `data`: Contains list of token properties and users who will become the owners of the888	///   corresponging tokens.889	/// - `nesting_budget`: Limit for token nesting depth890	pub fn create_multiple_items(891		collection: &NonfungibleHandle<T>,892		sender: &T::CrossAccountId,893		data: Vec<CreateItemData<T>>,894		nesting_budget: &dyn Budget,895	) -> DispatchResult {896		if !collection.is_owner_or_admin(sender) {897			ensure!(898				collection.permissions.mint_mode(),899				<CommonError<T>>::PublicMintingNotAllowed900			);901			collection.check_allowlist(sender)?;902903			for item in data.iter() {904				collection.check_allowlist(&item.owner)?;905			}906		}907908		for data in data.iter() {909			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;910		}911912		let first_token = <TokensMinted<T>>::get(collection.id);913		let tokens_minted = first_token914			.checked_add(data.len() as u32)915			.ok_or(ArithmeticError::Overflow)?;916		ensure!(917			tokens_minted <= collection.limits.token_limit(),918			<CommonError<T>>::CollectionTokenLimitExceeded919		);920921		let mut balances = BTreeMap::new();922		for data in &data {923			let balance = balances924				.entry(&data.owner)925				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));926			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;927928			ensure!(929				*balance <= collection.limits.account_token_ownership_limit(),930				<CommonError<T>>::AccountTokenLimitExceeded,931			);932		}933934		for (i, data) in data.iter().enumerate() {935			let token = TokenId(first_token + i as u32 + 1);936937			<PalletStructure<T>>::check_nesting(938				sender.clone(),939				&data.owner,940				collection.id,941				token,942				nesting_budget,943			)?;944		}945946		// =========947948		with_transaction(|| {949			for (i, data) in data.iter().enumerate() {950				let token = first_token + i as u32 + 1;951952				<TokenData<T>>::insert(953					(collection.id, token),954					ItemData {955						// const_data: data.const_data.clone(),956						owner: data.owner.clone(),957					},958				);959960				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(961					&data.owner,962					collection.id,963					TokenId(token),964				);965966				if let Err(e) = Self::set_token_properties(967					collection,968					sender,969					TokenId(token),970					data.properties.clone().into_iter(),971					true,972					nesting_budget,973				) {974					return TransactionOutcome::Rollback(Err(e));975				}976			}977			TransactionOutcome::Commit(Ok(()))978		})?;979980		<TokensMinted<T>>::insert(collection.id, tokens_minted);981		for (account, balance) in balances {982			<AccountBalance<T>>::insert((collection.id, account), balance);983		}984		for (i, data) in data.into_iter().enumerate() {985			let token = first_token + i as u32 + 1;986			<Owned<T>>::insert((collection.id, &data.owner, token), true);987988			<PalletEvm<T>>::deposit_log(989				ERC721Events::Transfer {990					from: H160::default(),991					to: *data.owner.as_eth(),992					token_id: token.into(),993				}994				.to_log(collection_id_to_address(collection.id)),995			);996			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(997				collection.id,998				TokenId(token),999				data.owner.clone(),1000				1,1001			));1002		}1003		Ok(())1004	}10051006	pub fn set_allowance_unchecked(1007		collection: &NonfungibleHandle<T>,1008		sender: &T::CrossAccountId,1009		token: TokenId,1010		spender: Option<&T::CrossAccountId>,1011		assume_implicit_eth: bool,1012	) {1013		if let Some(spender) = spender {1014			let old_spender = <Allowance<T>>::get((collection.id, token));1015			<Allowance<T>>::insert((collection.id, token), spender);1016			// In ERC721 there is only one possible approved user of token, so we set1017			// approved user to spender1018			<PalletEvm<T>>::deposit_log(1019				ERC721Events::Approval {1020					owner: *sender.as_eth(),1021					approved: *spender.as_eth(),1022					token_id: token.into(),1023				}1024				.to_log(collection_id_to_address(collection.id)),1025			);1026			// In Unique chain, any token can have any amount of approved users, so we need to1027			// set allowance of old owner to 0, and allowance of new owner to 11028			if old_spender.as_ref() != Some(spender) {1029				if let Some(old_owner) = old_spender {1030					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1031						collection.id,1032						token,1033						sender.clone(),1034						old_owner,1035						0,1036					));1037				}1038				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1039					collection.id,1040					token,1041					sender.clone(),1042					spender.clone(),1043					1,1044				));1045			}1046		} else {1047			let old_spender = <Allowance<T>>::take((collection.id, token));1048			if !assume_implicit_eth {1049				// In ERC721 there is only one possible approved user of token, so we set1050				// approved user to zero address1051				<PalletEvm<T>>::deposit_log(1052					ERC721Events::Approval {1053						owner: *sender.as_eth(),1054						approved: H160::default(),1055						token_id: token.into(),1056					}1057					.to_log(collection_id_to_address(collection.id)),1058				);1059			}1060			// In Unique chain, any token can have any amount of approved users, so we need to1061			// set allowance of old owner to 01062			if let Some(old_spender) = old_spender {1063				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1064					collection.id,1065					token,1066					sender.clone(),1067					old_spender,1068					0,1069				));1070			}1071		}1072	}10731074	pub fn get_allowance(1075		collection: &NonfungibleHandle<T>,1076		token_id: TokenId,1077	) -> Result<Option<T::CrossAccountId>, DispatchError> {1078		ensure!(1079			<TokenData<T>>::get((collection.id, token_id)).is_some(),1080			<CommonError<T>>::TokenNotFound1081		);1082		Ok(<Allowance<T>>::get((collection.id, token_id)))1083	}10841085	/// Set allowance for the spender to `transfer` or `burn` sender's token.1086	///1087	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1088	pub fn set_allowance(1089		collection: &NonfungibleHandle<T>,1090		sender: &T::CrossAccountId,1091		token: TokenId,1092		spender: Option<&T::CrossAccountId>,1093	) -> DispatchResult {1094		if collection.permissions.access() == AccessMode::AllowList {1095			collection.check_allowlist(sender)?;1096			if let Some(spender) = spender {1097				collection.check_allowlist(spender)?;1098			}1099		}11001101		if let Some(spender) = spender {1102			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1103		}11041105		let token_data =1106			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1107		if &token_data.owner != sender {1108			ensure!(1109				collection.ignores_owned_amount(sender),1110				<CommonError<T>>::CantApproveMoreThanOwned1111			);1112		}11131114		// =========11151116		Self::set_allowance_unchecked(collection, sender, token, spender, false);1117		Ok(())1118	}11191120	/// Set allowance for the spender to `transfer` or `burn` sender's token from eth mirror.1121	///1122	/// - `from`: Address of sender's eth mirror.1123	/// - `to`: Adress of spender.1124	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1125	pub fn set_allowance_from(1126		collection: &NonfungibleHandle<T>,1127		sender: &T::CrossAccountId,1128		from: &T::CrossAccountId,1129		token: TokenId,1130		to: Option<&T::CrossAccountId>,1131	) -> DispatchResult {1132		if collection.permissions.access() == AccessMode::AllowList {1133			collection.check_allowlist(sender)?;1134			collection.check_allowlist(from)?;1135			if let Some(to) = to {1136				collection.check_allowlist(to)?;1137			}1138		}11391140		if let Some(to) = to {1141			<PalletCommon<T>>::ensure_correct_receiver(to)?;1142		}11431144		ensure!(1145			sender.conv_eq(from),1146			<CommonError<T>>::AddressIsNotEthMirror1147		);11481149		let token_data =1150			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1151		if token_data.owner != *from {1152			ensure!(1153				collection.limits.owner_can_transfer()1154					&& (collection.is_owner_or_admin(sender) || collection.is_owner_or_admin(from)),1155				<CommonError<T>>::CantApproveMoreThanOwned1156			);1157		}11581159		// =========11601161		Self::set_allowance_unchecked(collection, from, token, to, false);1162		Ok(())1163	}11641165	/// Checks allowance for the spender to use the token.1166	fn check_allowed(1167		collection: &NonfungibleHandle<T>,1168		spender: &T::CrossAccountId,1169		from: &T::CrossAccountId,1170		token: TokenId,1171		nesting_budget: &dyn Budget,1172	) -> DispatchResult {1173		if spender.conv_eq(from) {1174			return Ok(());1175		}1176		if collection.permissions.access() == AccessMode::AllowList {1177			// `from`, `to` checked in [`transfer`]1178			collection.check_allowlist(spender)?;1179		}11801181		if collection.ignores_token_restrictions(spender) {1182			return Ok(());1183		}11841185		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1186			ensure!(1187				<PalletStructure<T>>::check_indirectly_owned(1188					spender.clone(),1189					source.0,1190					source.1,1191					None,1192					nesting_budget1193				)?,1194				<CommonError<T>>::ApprovedValueTooLow,1195			);1196			return Ok(());1197		}1198		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1199			return Ok(());1200		}1201		if <CollectionAllowance<T>>::get((collection.id, from, spender)) {1202			return Ok(());1203		}12041205		Err(<CommonError<T>>::ApprovedValueTooLow.into())1206	}12071208	/// Transfer NFT token from one account to another.1209	///1210	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1211	/// The owner should set allowance for the spender to transfer token.1212	///1213	/// [`transfer`]: struct.Pallet.html#method.transfer1214	pub fn transfer_from(1215		collection: &NonfungibleHandle<T>,1216		spender: &T::CrossAccountId,1217		from: &T::CrossAccountId,1218		to: &T::CrossAccountId,1219		token: TokenId,1220		nesting_budget: &dyn Budget,1221	) -> DispatchResult {1222		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12231224		// =========12251226		// Allowance is reset in [`transfer`]1227		Self::transfer(collection, from, to, token, nesting_budget)1228	}12291230	/// Burn NFT token for `from` account.1231	///1232	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1233	/// set allowance for the spender to burn token.1234	///1235	/// [`burn`]: struct.Pallet.html#method.burn1236	pub fn burn_from(1237		collection: &NonfungibleHandle<T>,1238		spender: &T::CrossAccountId,1239		from: &T::CrossAccountId,1240		token: TokenId,1241		nesting_budget: &dyn Budget,1242	) -> DispatchResult {1243		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12441245		// =========12461247		Self::burn(collection, from, token)1248	}12491250	/// Check that `from` token could be nested in `under` token.1251	///1252	pub fn check_nesting(1253		handle: &NonfungibleHandle<T>,1254		sender: T::CrossAccountId,1255		from: (CollectionId, TokenId),1256		under: TokenId,1257		nesting_budget: &dyn Budget,1258	) -> DispatchResult {1259		let nesting = handle.permissions.nesting();12601261		#[cfg(not(feature = "runtime-benchmarks"))]1262		let permissive = false;1263		#[cfg(feature = "runtime-benchmarks")]1264		let permissive = nesting.permissive;12651266		if permissive {1267			ensure!(1268				<TokenData<T>>::contains_key((handle.id, under)),1269				<CommonError<T>>::TokenNotFound1270			);1271		} else if nesting.token_owner1272			&& <PalletStructure<T>>::check_indirectly_owned(1273				sender.clone(),1274				handle.id,1275				under,1276				Some(from),1277				nesting_budget,1278			)? {1279			// Pass, token existence and ouroboros checks are done in `check_indirectly_owned`1280		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1281			// token existence and ouroboros checks are done in `get_checked_topmost_owner`1282			let _ = <PalletStructure<T>>::get_checked_topmost_owner(1283				handle.id,1284				under,1285				Some(from),1286				nesting_budget,1287			)?1288			.ok_or(<CommonError<T>>::TokenNotFound)?;1289		} else {1290			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1291		}12921293		if let Some(whitelist) = &nesting.restricted {1294			ensure!(1295				whitelist.contains(&from.0),1296				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1297			);1298		}1299		Ok(())1300	}13011302	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1303		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1304	}13051306	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1307		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1308	}13091310	fn collection_has_tokens(collection_id: CollectionId) -> bool {1311		<TokenData<T>>::iter_prefix((collection_id,))1312			.next()1313			.is_some()1314	}13151316	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1317		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1318			.next()1319			.is_some()1320	}13211322	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1323		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1324			.map(|((child_collection_id, child_id), _)| TokenChild {1325				collection: child_collection_id,1326				token: child_id,1327			})1328			.collect()1329	}13301331	/// Mint single NFT token.1332	///1333	/// Delegated to [`create_multiple_items`]1334	///1335	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1336	pub fn create_item(1337		collection: &NonfungibleHandle<T>,1338		sender: &T::CrossAccountId,1339		data: CreateItemData<T>,1340		nesting_budget: &dyn Budget,1341	) -> DispatchResult {1342		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1343	}13441345	/// Sets or unsets the approval of a given operator.1346	///1347	/// The `operator` is allowed to transfer all token pieces of the `owner` on their behalf.1348	/// - `owner`: Token owner1349	/// - `operator`: Operator1350	/// - `approve`: Should operator status be granted or revoked?1351	pub fn set_allowance_for_all(1352		collection: &NonfungibleHandle<T>,1353		owner: &T::CrossAccountId,1354		operator: &T::CrossAccountId,1355		approve: bool,1356	) -> DispatchResult {1357		<PalletCommon<T>>::set_allowance_for_all(1358			collection,1359			owner,1360			operator,1361			approve,1362			|| <CollectionAllowance<T>>::insert((collection.id, owner, operator), approve),1363			ERC721Events::ApprovalForAll {1364				owner: *owner.as_eth(),1365				operator: *operator.as_eth(),1366				approved: approve,1367			}1368			.to_log(collection_id_to_address(collection.id)),1369		)1370	}13711372	/// Tells whether the given `owner` approves the `operator`.1373	pub fn allowance_for_all(1374		collection: &NonfungibleHandle<T>,1375		owner: &T::CrossAccountId,1376		operator: &T::CrossAccountId,1377	) -> bool {1378		<CollectionAllowance<T>>::get((collection.id, owner, operator))1379	}13801381	pub fn repair_item(collection: &NonfungibleHandle<T>, token: TokenId) -> DispatchResult {1382		<TokenProperties<T>>::mutate((collection.id, token), |properties| {1383			properties.recompute_consumed_space();1384		});13851386		Ok(())1387	}1388}