git.delta.rocks / unique-network / refs/commits / eb176303d30b

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	weights::{PostDispatchInfo, Pays},101};102use up_data_structs::{103	AccessMode, CollectionId, CustomDataLimit, TokenId, CreateCollectionData, CreateNftExData,104	mapping::TokenAddressMapping, budget::Budget, Property, PropertyPermission, PropertyKey,105	PropertyValue, PropertyKeyPermission, Properties, PropertyScope, TrySetProperty, TokenChild,106	AuxPropertyValue,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::H160;116use sp_runtime::{ArithmeticError, DispatchError, DispatchResult, TransactionOutcome};117use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap, collections::btree_set::BTreeSet};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::account::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	#[pallet::generate_store(pub(super) trait Store)]179	pub struct Pallet<T>(_);180181	/// Total amount of minted tokens in a collection.182	#[pallet::storage]183	pub type TokensMinted<T: Config> =184		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;185186	/// Amount of burnt tokens in a collection.187	#[pallet::storage]188	pub type TokensBurnt<T: Config> =189		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;190191	/// Token data, used to partially describe a token.192	#[pallet::storage]193	pub type TokenData<T: Config> = StorageNMap<194		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),195		Value = ItemData<T::CrossAccountId>,196		QueryKind = OptionQuery,197	>;198199	/// Map of key-value pairs, describing the metadata of a token.200	#[pallet::storage]201	#[pallet::getter(fn token_properties)]202	pub type TokenProperties<T: Config> = StorageNMap<203		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),204		Value = Properties,205		QueryKind = ValueQuery,206		OnEmpty = up_data_structs::TokenProperties,207	>;208209	/// Custom data of a token that is serialized to bytes,210	/// primarily reserved for on-chain operations,211	/// normally obscured from the external users.212	///213	/// Auxiliary properties are slightly different from214	/// usual [`TokenProperties`] due to an unlimited number215	/// and separately stored and written-to key-value pairs.216	///217	/// Currently used to store RMRK data.218	#[pallet::storage]219	#[pallet::getter(fn token_aux_property)]220	pub type TokenAuxProperties<T: Config> = StorageNMap<221		Key = (222			Key<Twox64Concat, CollectionId>,223			Key<Twox64Concat, TokenId>,224			Key<Twox64Concat, PropertyScope>,225			Key<Twox64Concat, PropertyKey>,226		),227		Value = AuxPropertyValue,228		QueryKind = OptionQuery,229	>;230231	/// Used to enumerate tokens owned by account.232	#[pallet::storage]233	pub type Owned<T: Config> = StorageNMap<234		Key = (235			Key<Twox64Concat, CollectionId>,236			Key<Blake2_128Concat, T::CrossAccountId>,237			Key<Twox64Concat, TokenId>,238		),239		Value = bool,240		QueryKind = ValueQuery,241	>;242243	/// Used to enumerate token's children.244	#[pallet::storage]245	#[pallet::getter(fn token_children)]246	pub type TokenChildren<T: Config> = StorageNMap<247		Key = (248			Key<Twox64Concat, CollectionId>,249			Key<Twox64Concat, TokenId>,250			Key<Twox64Concat, (CollectionId, TokenId)>,251		),252		Value = bool,253		QueryKind = ValueQuery,254	>;255256	/// Amount of tokens owned by an account in a collection.257	#[pallet::storage]258	pub type AccountBalance<T: Config> = StorageNMap<259		Key = (260			Key<Twox64Concat, CollectionId>,261			Key<Blake2_128Concat, T::CrossAccountId>,262		),263		Value = u32,264		QueryKind = ValueQuery,265	>;266267	/// Allowance set by a token owner for another user to perform one of certain transactions on a token.268	#[pallet::storage]269	pub type Allowance<T: Config> = StorageNMap<270		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),271		Value = T::CrossAccountId,272		QueryKind = OptionQuery,273	>;274275	/// Upgrade from the old schema to properties.276	#[pallet::hooks]277	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {278		fn on_runtime_upgrade() -> Weight {279			StorageVersion::new(1).put::<Pallet<T>>();280281			0282		}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}298impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {299	fn recorder(&self) -> &SubstrateRecorder<T> {300		self.0.recorder()301	}302	fn into_recorder(self) -> SubstrateRecorder<T> {303		self.0.into_recorder()304	}305}306impl<T: Config> Deref for NonfungibleHandle<T> {307	type Target = pallet_common::CollectionHandle<T>;308309	fn deref(&self) -> &Self::Target {310		&self.0311	}312}313314impl<T: Config> Pallet<T> {315	/// Get number of NFT tokens in collection.316	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {317		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)318	}319320	/// Check that NFT token exists.321	///322	/// - `token`: Token ID.323	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {324		<TokenData<T>>::contains_key((collection.id, token))325	}326327	/// Set the token property with the scope.328	///329	/// - `property`: Contains key-value pair.330	pub fn set_scoped_token_property(331		collection_id: CollectionId,332		token_id: TokenId,333		scope: PropertyScope,334		property: Property,335	) -> DispatchResult {336		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {337			properties.try_scoped_set(scope, property.key, property.value)338		})339		.map_err(<CommonError<T>>::from)?;340341		Ok(())342	}343344	/// Batch operation to set multiple properties with the same scope.345	pub fn set_scoped_token_properties(346		collection_id: CollectionId,347		token_id: TokenId,348		scope: PropertyScope,349		properties: impl Iterator<Item = Property>,350	) -> DispatchResult {351		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {352			stored_properties.try_scoped_set_from_iter(scope, properties)353		})354		.map_err(<CommonError<T>>::from)?;355356		Ok(())357	}358359	/// Add or edit auxiliary data for the property.360	///361	/// - `f`: function that adds or edits auxiliary data.362	pub fn try_mutate_token_aux_property<R, E>(363		collection_id: CollectionId,364		token_id: TokenId,365		scope: PropertyScope,366		key: PropertyKey,367		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,368	) -> Result<R, E> {369		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)370	}371372	/// Remove auxiliary data for the property.373	pub fn remove_token_aux_property(374		collection_id: CollectionId,375		token_id: TokenId,376		scope: PropertyScope,377		key: PropertyKey,378	) {379		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));380	}381382	/// Get all auxiliary data in a given scope.383	///384	/// Returns iterator over Property Key - Data pairs.385	pub fn iterate_token_aux_properties(386		collection_id: CollectionId,387		token_id: TokenId,388		scope: PropertyScope,389	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {390		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))391	}392393	/// Get ID of the last minted token394	pub fn current_token_id(collection_id: CollectionId) -> TokenId {395		TokenId(<TokensMinted<T>>::get(collection_id))396	}397}398399// unchecked calls skips any permission checks400impl<T: Config> Pallet<T> {401	/// Create NFT collection402	///403	/// `init_collection` will take non-refundable deposit for collection creation.404	///405	/// - `data`: Contains settings for collection limits and permissions.406	pub fn init_collection(407		owner: T::CrossAccountId,408		data: CreateCollectionData<T::AccountId>,409		is_external: bool,410	) -> Result<CollectionId, DispatchError> {411		<PalletCommon<T>>::init_collection(owner, data, is_external)412	}413414	/// Destroy NFT collection415	///416	/// `destroy_collection` will throw error if collection contains any tokens.417	/// Only owner can destroy collection.418	pub fn destroy_collection(419		collection: NonfungibleHandle<T>,420		sender: &T::CrossAccountId,421	) -> DispatchResult {422		let id = collection.id;423424		if Self::collection_has_tokens(id) {425			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());426		}427428		// =========429430		PalletCommon::destroy_collection(collection.0, sender)?;431432		<TokenData<T>>::remove_prefix((id,), None);433		<TokenChildren<T>>::remove_prefix((id,), None);434		<Owned<T>>::remove_prefix((id,), None);435		<TokensMinted<T>>::remove(id);436		<TokensBurnt<T>>::remove(id);437		<Allowance<T>>::remove_prefix((id,), None);438		<AccountBalance<T>>::remove_prefix((id,), None);439		Ok(())440	}441442	/// Burn NFT token443	///444	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token445	/// if the token is nested.446	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.447	/// Also removes all corresponding properties and auxiliary properties.448	///449	/// - `token`: Token that should be burned450	/// - `collection`: Collection that contains the token451	pub fn burn(452		collection: &NonfungibleHandle<T>,453		sender: &T::CrossAccountId,454		token: TokenId,455	) -> DispatchResult {456		let token_data =457			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;458		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);459460		if collection.permissions.access() == AccessMode::AllowList {461			collection.check_allowlist(sender)?;462		}463464		if Self::token_has_children(collection.id, token) {465			return Err(<Error<T>>::CantBurnNftWithChildren.into());466		}467468		let burnt = <TokensBurnt<T>>::get(collection.id)469			.checked_add(1)470			.ok_or(ArithmeticError::Overflow)?;471472		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))473			.checked_sub(1)474			.ok_or(ArithmeticError::Overflow)?;475476		// =========477478		if balance == 0 {479			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));480		} else {481			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);482		}483484		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);485486		<Owned<T>>::remove((collection.id, &token_data.owner, token));487		<TokensBurnt<T>>::insert(collection.id, burnt);488		<TokenData<T>>::remove((collection.id, token));489		<TokenProperties<T>>::remove((collection.id, token));490		<TokenAuxProperties<T>>::remove_prefix((collection.id, token), None);491		let old_spender = <Allowance<T>>::take((collection.id, token));492493		if let Some(old_spender) = old_spender {494			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(495				collection.id,496				token,497				token_data.owner.clone(),498				old_spender,499				0,500			));501		}502503		<PalletEvm<T>>::deposit_log(504			ERC721Events::Transfer {505				from: *token_data.owner.as_eth(),506				to: H160::default(),507				token_id: token.into(),508			}509			.to_log(collection_id_to_address(collection.id)),510		);511		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(512			collection.id,513			token,514			token_data.owner,515			1,516		));517		Ok(())518	}519520	/// Same as [`burn`] but burns all the tokens that are nested in the token first521	///522	/// - `self_budget`: Limit for searching children in depth.523	/// - `breadth_budget`: Limit of breadth of searching children.524	///525	/// [`burn`]: struct.Pallet.html#method.burn526	#[transactional]527	pub fn burn_recursively(528		collection: &NonfungibleHandle<T>,529		sender: &T::CrossAccountId,530		token: TokenId,531		self_budget: &dyn Budget,532		breadth_budget: &dyn Budget,533	) -> DispatchResultWithPostInfo {534		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);535536		let current_token_account =537			T::CrossTokenAddressMapping::token_to_address(collection.id, token);538539		let mut weight = 0 as Weight;540541		// This method is transactional, if user in fact doesn't have permissions to remove token -542		// tokens removed here will be restored after rejected transaction543		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {544			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);545			let PostDispatchInfo { actual_weight, .. } =546				<PalletStructure<T>>::burn_item_recursively(547					current_token_account.clone(),548					collection,549					token,550					self_budget,551					breadth_budget,552				)?;553			if let Some(actual_weight) = actual_weight {554				weight = weight.saturating_add(actual_weight);555			}556		}557558		Self::burn(collection, sender, token)?;559		DispatchResultWithPostInfo::Ok(PostDispatchInfo {560			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),561			pays_fee: Pays::Yes,562		})563	}564565	/// Batch operation to add, edit or remove properties for the token566	///567	/// All affected properties should have mutable permission and sender should have568	/// permission to edit those properties.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	#[transactional]574	fn modify_token_properties(575		collection: &NonfungibleHandle<T>,576		sender: &T::CrossAccountId,577		token_id: TokenId,578		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,579		is_token_create: bool,580		nesting_budget: &dyn Budget,581	) -> DispatchResult {582		let mut collection_admin_status = None;583		let mut token_owner_result = None;584585		let mut is_collection_admin =586			|| *collection_admin_status.get_or_insert_with(|| collection.is_owner_or_admin(sender));587588		let mut is_token_owner = || {589			*token_owner_result.get_or_insert_with(|| -> Result<bool, DispatchError> {590				let is_owned = <PalletStructure<T>>::check_indirectly_owned(591					sender.clone(),592					collection.id,593					token_id,594					None,595					nesting_budget,596				)?;597598				Ok(is_owned)599			})600		};601602		for (key, value) in properties {603			let permission = <PalletCommon<T>>::property_permissions(collection.id)604				.get(&key)605				.cloned()606				.unwrap_or_else(PropertyPermission::none);607608			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))609				.get(&key)610				.is_some();611612			match permission {613				PropertyPermission { mutable: false, .. } if is_property_exists => {614					return Err(<CommonError<T>>::NoPermission.into());615				}616617				PropertyPermission {618					collection_admin,619					token_owner,620					..621				} => {622					//TODO: investigate threats during public minting.623					if is_token_create && (collection_admin || token_owner) && value.is_some() {624						// Pass625					} else if collection_admin && is_collection_admin() {626						// Pass627					} else if token_owner && is_token_owner()? {628						// Pass629					} else {630						fail!(<CommonError<T>>::NoPermission);631					}632				}633			}634635			match value {636				Some(value) => {637					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {638						properties.try_set(key.clone(), value)639					})640					.map_err(<CommonError<T>>::from)?;641642					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(643						collection.id,644						token_id,645						key,646					));647				}648				None => {649					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {650						properties.remove(&key)651					})652					.map_err(<CommonError<T>>::from)?;653654					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(655						collection.id,656						token_id,657						key,658					));659				}660			}661		}662663		Ok(())664	}665666	/// Batch operation to add or edit properties for the token667	///668	/// Same as [`modify_token_properties`] but doesn't allow to remove properties669	///670	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties671	pub fn set_token_properties(672		collection: &NonfungibleHandle<T>,673		sender: &T::CrossAccountId,674		token_id: TokenId,675		properties: impl Iterator<Item = Property>,676		is_token_create: bool,677		nesting_budget: &dyn Budget,678	) -> DispatchResult {679		Self::modify_token_properties(680			collection,681			sender,682			token_id,683			properties.map(|p| (p.key, Some(p.value))),684			is_token_create,685			nesting_budget,686		)687	}688689	/// Add or edit single property for the token690	///691	/// Calls [`set_token_properties`] internally692	///693	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties694	pub fn set_token_property(695		collection: &NonfungibleHandle<T>,696		sender: &T::CrossAccountId,697		token_id: TokenId,698		property: Property,699		nesting_budget: &dyn Budget,700	) -> DispatchResult {701		let is_token_create = false;702703		Self::set_token_properties(704			collection,705			sender,706			token_id,707			[property].into_iter(),708			is_token_create,709			nesting_budget,710		)711	}712713	/// Batch operation to remove properties from the token714	///715	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties716	///717	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties718	pub fn delete_token_properties(719		collection: &NonfungibleHandle<T>,720		sender: &T::CrossAccountId,721		token_id: TokenId,722		property_keys: impl Iterator<Item = PropertyKey>,723		nesting_budget: &dyn Budget,724	) -> DispatchResult {725		let is_token_create = false;726727		Self::modify_token_properties(728			collection,729			sender,730			token_id,731			property_keys.into_iter().map(|key| (key, None)),732			is_token_create,733			nesting_budget,734		)735	}736737	/// Remove single property from the token738	///739	/// Calls [`delete_token_properties`] internally740	///741	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties742	pub fn delete_token_property(743		collection: &NonfungibleHandle<T>,744		sender: &T::CrossAccountId,745		token_id: TokenId,746		property_key: PropertyKey,747		nesting_budget: &dyn Budget,748	) -> DispatchResult {749		Self::delete_token_properties(750			collection,751			sender,752			token_id,753			[property_key].into_iter(),754			nesting_budget,755		)756	}757758	/// Add or edit properties for the collection759	pub fn set_collection_properties(760		collection: &NonfungibleHandle<T>,761		sender: &T::CrossAccountId,762		properties: Vec<Property>,763	) -> DispatchResult {764		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)765	}766767	/// Remove properties from the collection768	pub fn delete_collection_properties(769		collection: &CollectionHandle<T>,770		sender: &T::CrossAccountId,771		property_keys: Vec<PropertyKey>,772	) -> DispatchResult {773		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)774	}775776	/// Set property permissions for the token.777	///778	/// Sender should be the owner or admin of token's collection.779	pub fn set_token_property_permissions(780		collection: &CollectionHandle<T>,781		sender: &T::CrossAccountId,782		property_permissions: Vec<PropertyKeyPermission>,783	) -> DispatchResult {784		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)785	}786787	/// Set property permissions for the collection.788	///789	/// Sender should be the owner or admin of the collection.790	pub fn set_property_permission(791		collection: &CollectionHandle<T>,792		sender: &T::CrossAccountId,793		permission: PropertyKeyPermission,794	) -> DispatchResult {795		<PalletCommon<T>>::set_property_permission(collection, sender, permission)796	}797798	/// Transfer NFT token from one account to another.799	///800	/// `from` account stops being the owner and `to` account becomes the owner of the token.801	/// If `to` is token than `to` becomes owner of the token and the token become nested.802	/// Unnests token from previous parent if it was nested before.803	/// Removes allowance for the token if there was any.804	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.805	///806	/// - `nesting_budget`: Limit for token nesting depth807	pub fn transfer(808		collection: &NonfungibleHandle<T>,809		from: &T::CrossAccountId,810		to: &T::CrossAccountId,811		token: TokenId,812		nesting_budget: &dyn Budget,813	) -> DispatchResult {814		ensure!(815			collection.limits.transfers_enabled(),816			<CommonError<T>>::TransferNotAllowed817		);818819		let token_data =820			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;821		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);822823		if collection.permissions.access() == AccessMode::AllowList {824			collection.check_allowlist(from)?;825			collection.check_allowlist(to)?;826		}827		<PalletCommon<T>>::ensure_correct_receiver(to)?;828829		let balance_from = <AccountBalance<T>>::get((collection.id, from))830			.checked_sub(1)831			.ok_or(<CommonError<T>>::TokenValueTooLow)?;832		let balance_to = if from != to {833			let balance_to = <AccountBalance<T>>::get((collection.id, to))834				.checked_add(1)835				.ok_or(ArithmeticError::Overflow)?;836837			ensure!(838				balance_to < collection.limits.account_token_ownership_limit(),839				<CommonError<T>>::AccountTokenLimitExceeded,840			);841842			Some(balance_to)843		} else {844			None845		};846847		<PalletStructure<T>>::nest_if_sent_to_token(848			from.clone(),849			to,850			collection.id,851			token,852			nesting_budget,853		)?;854855		// =========856857		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);858859		<TokenData<T>>::insert(860			(collection.id, token),861			ItemData {862				owner: to.clone(),863				..token_data864			},865		);866867		if let Some(balance_to) = balance_to {868			// from != to869			if balance_from == 0 {870				<AccountBalance<T>>::remove((collection.id, from));871			} else {872				<AccountBalance<T>>::insert((collection.id, from), balance_from);873			}874			<AccountBalance<T>>::insert((collection.id, to), balance_to);875			<Owned<T>>::remove((collection.id, from, token));876			<Owned<T>>::insert((collection.id, to, token), true);877		}878		Self::set_allowance_unchecked(collection, from, token, None, true);879880		<PalletEvm<T>>::deposit_log(881			ERC721Events::Transfer {882				from: *from.as_eth(),883				to: *to.as_eth(),884				token_id: token.into(),885			}886			.to_log(collection_id_to_address(collection.id)),887		);888		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(889			collection.id,890			token,891			from.clone(),892			to.clone(),893			1,894		));895		Ok(())896	}897898	/// Batch operation to mint multiple NFT tokens.899	///900	/// The sender should be the owner/admin of the collection or collection should be configured901	/// to allow public minting.902	/// Throws if amount of tokens reached it's limit for the collection or if caller reached903	/// token ownership limit.904	///905	/// - `data`: Contains list of token properties and users who will become the owners of the906	///   corresponging tokens.907	/// - `nesting_budget`: Limit for token nesting depth908	pub fn create_multiple_items(909		collection: &NonfungibleHandle<T>,910		sender: &T::CrossAccountId,911		data: Vec<CreateItemData<T>>,912		nesting_budget: &dyn Budget,913	) -> DispatchResult {914		if !collection.is_owner_or_admin(sender) {915			ensure!(916				collection.permissions.mint_mode(),917				<CommonError<T>>::PublicMintingNotAllowed918			);919			collection.check_allowlist(sender)?;920921			for item in data.iter() {922				collection.check_allowlist(&item.owner)?;923			}924		}925926		for data in data.iter() {927			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;928		}929930		let first_token = <TokensMinted<T>>::get(collection.id);931		let tokens_minted = first_token932			.checked_add(data.len() as u32)933			.ok_or(ArithmeticError::Overflow)?;934		ensure!(935			tokens_minted <= collection.limits.token_limit(),936			<CommonError<T>>::CollectionTokenLimitExceeded937		);938939		let mut balances = BTreeMap::new();940		for data in &data {941			let balance = balances942				.entry(&data.owner)943				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));944			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;945946			ensure!(947				*balance <= collection.limits.account_token_ownership_limit(),948				<CommonError<T>>::AccountTokenLimitExceeded,949			);950		}951952		for (i, data) in data.iter().enumerate() {953			let token = TokenId(first_token + i as u32 + 1);954955			<PalletStructure<T>>::check_nesting(956				sender.clone(),957				&data.owner,958				collection.id,959				token,960				nesting_budget,961			)?;962		}963964		// =========965966		with_transaction(|| {967			for (i, data) in data.iter().enumerate() {968				let token = first_token + i as u32 + 1;969970				<TokenData<T>>::insert(971					(collection.id, token),972					ItemData {973						// const_data: data.const_data.clone(),974						owner: data.owner.clone(),975					},976				);977978				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(979					&data.owner,980					collection.id,981					TokenId(token),982				);983984				if let Err(e) = Self::set_token_properties(985					collection,986					sender,987					TokenId(token),988					data.properties.clone().into_iter(),989					true,990					nesting_budget,991				) {992					return TransactionOutcome::Rollback(Err(e));993				}994			}995			TransactionOutcome::Commit(Ok(()))996		})?;997998		<TokensMinted<T>>::insert(collection.id, tokens_minted);999		for (account, balance) in balances {1000			<AccountBalance<T>>::insert((collection.id, account), balance);1001		}1002		for (i, data) in data.into_iter().enumerate() {1003			let token = first_token + i as u32 + 1;1004			<Owned<T>>::insert((collection.id, &data.owner, token), true);10051006			<PalletEvm<T>>::deposit_log(1007				ERC721Events::Transfer {1008					from: H160::default(),1009					to: *data.owner.as_eth(),1010					token_id: token.into(),1011				}1012				.to_log(collection_id_to_address(collection.id)),1013			);1014			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1015				collection.id,1016				TokenId(token),1017				data.owner.clone(),1018				1,1019			));1020		}1021		Ok(())1022	}10231024	pub fn set_allowance_unchecked(1025		collection: &NonfungibleHandle<T>,1026		sender: &T::CrossAccountId,1027		token: TokenId,1028		spender: Option<&T::CrossAccountId>,1029		assume_implicit_eth: bool,1030	) {1031		if let Some(spender) = spender {1032			let old_spender = <Allowance<T>>::get((collection.id, token));1033			<Allowance<T>>::insert((collection.id, token), spender);1034			// In ERC721 there is only one possible approved user of token, so we set1035			// approved user to spender1036			<PalletEvm<T>>::deposit_log(1037				ERC721Events::Approval {1038					owner: *sender.as_eth(),1039					approved: *spender.as_eth(),1040					token_id: token.into(),1041				}1042				.to_log(collection_id_to_address(collection.id)),1043			);1044			// In Unique chain, any token can have any amount of approved users, so we need to1045			// set allowance of old owner to 0, and allowance of new owner to 11046			if old_spender.as_ref() != Some(spender) {1047				if let Some(old_owner) = old_spender {1048					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1049						collection.id,1050						token,1051						sender.clone(),1052						old_owner,1053						0,1054					));1055				}1056				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1057					collection.id,1058					token,1059					sender.clone(),1060					spender.clone(),1061					1,1062				));1063			}1064		} else {1065			let old_spender = <Allowance<T>>::take((collection.id, token));1066			if !assume_implicit_eth {1067				// In ERC721 there is only one possible approved user of token, so we set1068				// approved user to zero address1069				<PalletEvm<T>>::deposit_log(1070					ERC721Events::Approval {1071						owner: *sender.as_eth(),1072						approved: H160::default(),1073						token_id: token.into(),1074					}1075					.to_log(collection_id_to_address(collection.id)),1076				);1077			}1078			// In Unique chain, any token can have any amount of approved users, so we need to1079			// set allowance of old owner to 01080			if let Some(old_spender) = old_spender {1081				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1082					collection.id,1083					token,1084					sender.clone(),1085					old_spender,1086					0,1087				));1088			}1089		}1090	}10911092	/// Set allowance for the spender to `transfer` or `burn` sender's token.1093	///1094	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1095	pub fn set_allowance(1096		collection: &NonfungibleHandle<T>,1097		sender: &T::CrossAccountId,1098		token: TokenId,1099		spender: Option<&T::CrossAccountId>,1100	) -> DispatchResult {1101		if collection.permissions.access() == AccessMode::AllowList {1102			collection.check_allowlist(sender)?;1103			if let Some(spender) = spender {1104				collection.check_allowlist(spender)?;1105			}1106		}11071108		if let Some(spender) = spender {1109			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1110		}11111112		let token_data =1113			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1114		if &token_data.owner != sender {1115			ensure!(1116				collection.ignores_owned_amount(sender),1117				<CommonError<T>>::CantApproveMoreThanOwned1118			);1119		}11201121		// =========11221123		Self::set_allowance_unchecked(collection, sender, token, spender, false);1124		Ok(())1125	}11261127	/// Checks allowance for the spender to use the token.1128	fn check_allowed(1129		collection: &NonfungibleHandle<T>,1130		spender: &T::CrossAccountId,1131		from: &T::CrossAccountId,1132		token: TokenId,1133		nesting_budget: &dyn Budget,1134	) -> DispatchResult {1135		if spender.conv_eq(from) {1136			return Ok(());1137		}1138		if collection.permissions.access() == AccessMode::AllowList {1139			// `from`, `to` checked in [`transfer`]1140			collection.check_allowlist(spender)?;1141		}11421143		if collection.limits.owner_can_transfer() && collection.is_owner_or_admin(spender) {1144			return Ok(());1145		}11461147		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1148			ensure!(1149				<PalletStructure<T>>::check_indirectly_owned(1150					spender.clone(),1151					source.0,1152					source.1,1153					None,1154					nesting_budget1155				)?,1156				<CommonError<T>>::ApprovedValueTooLow,1157			);1158			return Ok(());1159		}1160		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1161			return Ok(());1162		}1163		ensure!(1164			collection.ignores_allowance(spender),1165			<CommonError<T>>::ApprovedValueTooLow1166		);1167		Ok(())1168	}11691170	/// Transfer NFT token from one account to another.1171	///1172	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1173	/// The owner should set allowance for the spender to transfer token.1174	///1175	/// [`transfer`]: struct.Pallet.html#method.transfer1176	pub fn transfer_from(1177		collection: &NonfungibleHandle<T>,1178		spender: &T::CrossAccountId,1179		from: &T::CrossAccountId,1180		to: &T::CrossAccountId,1181		token: TokenId,1182		nesting_budget: &dyn Budget,1183	) -> DispatchResult {1184		Self::check_allowed(collection, spender, from, token, nesting_budget)?;11851186		// =========11871188		// Allowance is reset in [`transfer`]1189		Self::transfer(collection, from, to, token, nesting_budget)1190	}11911192	/// Burn NFT token for `from` account.1193	///1194	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1195	/// set allowance for the spender to burn token.1196	///1197	/// [`burn`]: struct.Pallet.html#method.burn1198	pub fn burn_from(1199		collection: &NonfungibleHandle<T>,1200		spender: &T::CrossAccountId,1201		from: &T::CrossAccountId,1202		token: TokenId,1203		nesting_budget: &dyn Budget,1204	) -> DispatchResult {1205		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12061207		// =========12081209		Self::burn(collection, from, token)1210	}12111212	/// Check that `from` token could be nested in `under` token.1213	///1214	pub fn check_nesting(1215		handle: &NonfungibleHandle<T>,1216		sender: T::CrossAccountId,1217		from: (CollectionId, TokenId),1218		under: TokenId,1219		nesting_budget: &dyn Budget,1220	) -> DispatchResult {1221		let nesting = handle.permissions.nesting();12221223		#[cfg(not(feature = "runtime-benchmarks"))]1224		let permissive = false;1225		#[cfg(feature = "runtime-benchmarks")]1226		let permissive = nesting.permissive;12271228		if permissive {1229			// Pass1230		} else if nesting.token_owner1231			&& <PalletStructure<T>>::check_indirectly_owned(1232				sender.clone(),1233				handle.id,1234				under,1235				Some(from),1236				nesting_budget,1237			)? {1238			// Pass1239		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1240			// Pass1241		} else {1242			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1243		}12441245		if let Some(whitelist) = &nesting.restricted {1246			ensure!(1247				whitelist.contains(&from.0),1248				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1249			);1250		}1251		Ok(())1252	}12531254	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1255		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1256	}12571258	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1259		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1260	}12611262	fn collection_has_tokens(collection_id: CollectionId) -> bool {1263		<TokenData<T>>::iter_prefix((collection_id,))1264			.next()1265			.is_some()1266	}12671268	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1269		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1270			.next()1271			.is_some()1272	}12731274	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1275		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1276			.map(|((child_collection_id, child_id), _)| TokenChild {1277				collection: child_collection_id,1278				token: child_id,1279			})1280			.collect()1281	}12821283	/// Mint single NFT token.1284	///1285	/// Delegated to [`create_multiple_items`]1286	///1287	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1288	pub fn create_item(1289		collection: &NonfungibleHandle<T>,1290		sender: &T::CrossAccountId,1291		data: CreateItemData<T>,1292		nesting_budget: &dyn Budget,1293	) -> DispatchResult {1294		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1295	}1296}