git.delta.rocks / unique-network / refs/commits / 4458a1dde4ff

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			if StorageVersion::get::<Pallet<T>>() < StorageVersion::new(1) {280				let mut had_consts = BTreeSet::new();281				<TokenData<T>>::translate::<ItemDataVersion1<T::CrossAccountId>, _>(282					|(collection, token), v| {283						let mut props = vec![];284						if !v.const_data.is_empty() {285							props.push(Property {286								key: b"_old_constData".to_vec().try_into().unwrap(),287								value: v288									.const_data289									.clone()290									.into_inner()291									.try_into()292									.expect("const too long"),293							});294							had_consts.insert(collection);295						}296						if !v.variable_data.is_empty() {297							props.push(Property {298								key: b"_old_variableData".to_vec().try_into().unwrap(),299								value: v300									.variable_data301									.clone()302									.into_inner()303									.try_into()304									.expect("variable too long"),305							})306						}307						if !props.is_empty() {308							Self::set_scoped_token_properties(309								collection,310								token,311								PropertyScope::None,312								props.into_iter(),313							)314							.expect("existing token data exceeds property storage");315						}316						Some(<ItemDataVersion2<T::CrossAccountId>>::from(v))317					},318				);319				for collection in had_consts {320					<PalletCommon<T>>::set_property_permission_unchecked(321						collection,322						PropertyKeyPermission {323							key: b"_old_constData".to_vec().try_into().unwrap(),324							permission: PropertyPermission {325								mutable: false,326								collection_admin: true,327								token_owner: false,328							},329						},330					)331					.expect("failed to configure permission");332				}333			}334335			0336		}337	}338}339340pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);341impl<T: Config> NonfungibleHandle<T> {342	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {343		Self(inner)344	}345	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {346		self.0347	}348	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {349		&mut self.0350	}351}352impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {353	fn recorder(&self) -> &SubstrateRecorder<T> {354		self.0.recorder()355	}356	fn into_recorder(self) -> SubstrateRecorder<T> {357		self.0.into_recorder()358	}359}360impl<T: Config> Deref for NonfungibleHandle<T> {361	type Target = pallet_common::CollectionHandle<T>;362363	fn deref(&self) -> &Self::Target {364		&self.0365	}366}367368impl<T: Config> Pallet<T> {369	/// Get number of NFT tokens in collection.370	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {371		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)372	}373374	/// Check that NFT token exists.375	///376	/// - `token`: Token ID.377	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {378		<TokenData<T>>::contains_key((collection.id, token))379	}380381	/// Set the token property with the scope.382	///383	/// - `property`: Contains key-value pair.384	pub fn set_scoped_token_property(385		collection_id: CollectionId,386		token_id: TokenId,387		scope: PropertyScope,388		property: Property,389	) -> DispatchResult {390		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {391			properties.try_scoped_set(scope, property.key, property.value)392		})393		.map_err(<CommonError<T>>::from)?;394395		Ok(())396	}397398	/// Batch operation to set multiple properties with the same scope.399	pub fn set_scoped_token_properties(400		collection_id: CollectionId,401		token_id: TokenId,402		scope: PropertyScope,403		properties: impl Iterator<Item = Property>,404	) -> DispatchResult {405		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {406			stored_properties.try_scoped_set_from_iter(scope, properties)407		})408		.map_err(<CommonError<T>>::from)?;409410		Ok(())411	}412413	/// Add or edit auxiliary data for the property.414	///415	/// - `f`: function that adds or edits auxiliary data.416	pub fn try_mutate_token_aux_property<R, E>(417		collection_id: CollectionId,418		token_id: TokenId,419		scope: PropertyScope,420		key: PropertyKey,421		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,422	) -> Result<R, E> {423		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)424	}425426	/// Remove auxiliary data for the property.427	pub fn remove_token_aux_property(428		collection_id: CollectionId,429		token_id: TokenId,430		scope: PropertyScope,431		key: PropertyKey,432	) {433		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));434	}435436	/// Get all auxiliary data in a given scope.437	///438	/// Returns iterator over Property Key - Data pairs.439	pub fn iterate_token_aux_properties(440		collection_id: CollectionId,441		token_id: TokenId,442		scope: PropertyScope,443	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {444		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))445	}446447	/// Get ID of the last minted token448	pub fn current_token_id(collection_id: CollectionId) -> TokenId {449		TokenId(<TokensMinted<T>>::get(collection_id))450	}451}452453// unchecked calls skips any permission checks454impl<T: Config> Pallet<T> {455	/// Create NFT collection456	///457	/// `init_collection` will take non-refundable deposit for collection creation.458	///459	/// - `data`: Contains settings for collection limits and permissions.460	pub fn init_collection(461		owner: T::CrossAccountId,462		data: CreateCollectionData<T::AccountId>,463		is_external: bool,464	) -> Result<CollectionId, DispatchError> {465		<PalletCommon<T>>::init_collection(owner, data, is_external)466	}467468	/// Destroy NFT collection469	///470	/// `destroy_collection` will throw error if collection contains any tokens.471	/// Only owner can destroy collection.472	pub fn destroy_collection(473		collection: NonfungibleHandle<T>,474		sender: &T::CrossAccountId,475	) -> DispatchResult {476		let id = collection.id;477478		if Self::collection_has_tokens(id) {479			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());480		}481482		// =========483484		PalletCommon::destroy_collection(collection.0, sender)?;485486		<TokenData<T>>::remove_prefix((id,), None);487		<TokenChildren<T>>::remove_prefix((id,), None);488		<Owned<T>>::remove_prefix((id,), None);489		<TokensMinted<T>>::remove(id);490		<TokensBurnt<T>>::remove(id);491		<Allowance<T>>::remove_prefix((id,), None);492		<AccountBalance<T>>::remove_prefix((id,), None);493		Ok(())494	}495496	/// Burn NFT token497	///498	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token499	/// if the token is nested.500	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.501	/// Also removes all corresponding properties and auxiliary properties.502	///503	/// - `token`: Token that should be burned504	/// - `collection`: Collection that contains the token505	pub fn burn(506		collection: &NonfungibleHandle<T>,507		sender: &T::CrossAccountId,508		token: TokenId,509	) -> DispatchResult {510		let token_data =511			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;512		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);513514		if collection.permissions.access() == AccessMode::AllowList {515			collection.check_allowlist(sender)?;516		}517518		if Self::token_has_children(collection.id, token) {519			return Err(<Error<T>>::CantBurnNftWithChildren.into());520		}521522		let burnt = <TokensBurnt<T>>::get(collection.id)523			.checked_add(1)524			.ok_or(ArithmeticError::Overflow)?;525526		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))527			.checked_sub(1)528			.ok_or(ArithmeticError::Overflow)?;529530		// =========531532		if balance == 0 {533			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));534		} else {535			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);536		}537538		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);539540		<Owned<T>>::remove((collection.id, &token_data.owner, token));541		<TokensBurnt<T>>::insert(collection.id, burnt);542		<TokenData<T>>::remove((collection.id, token));543		<TokenProperties<T>>::remove((collection.id, token));544		<TokenAuxProperties<T>>::remove_prefix((collection.id, token), None);545		let old_spender = <Allowance<T>>::take((collection.id, token));546547		if let Some(old_spender) = old_spender {548			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(549				collection.id,550				token,551				token_data.owner.clone(),552				old_spender,553				0,554			));555		}556557		<PalletEvm<T>>::deposit_log(558			ERC721Events::Transfer {559				from: *token_data.owner.as_eth(),560				to: H160::default(),561				token_id: token.into(),562			}563			.to_log(collection_id_to_address(collection.id)),564		);565		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(566			collection.id,567			token,568			token_data.owner,569			1,570		));571		Ok(())572	}573574	/// Same as [`burn`] but burns all the tokens that are nested in the token first575	///576	/// - `self_budget`: Limit for searching children in depth.577	/// - `breadth_budget`: Limit of breadth of searching children.578	///579	/// [`burn`]: struct.Pallet.html#method.burn580	#[transactional]581	pub fn burn_recursively(582		collection: &NonfungibleHandle<T>,583		sender: &T::CrossAccountId,584		token: TokenId,585		self_budget: &dyn Budget,586		breadth_budget: &dyn Budget,587	) -> DispatchResultWithPostInfo {588		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);589590		let current_token_account =591			T::CrossTokenAddressMapping::token_to_address(collection.id, token);592593		let mut weight = 0 as Weight;594595		// This method is transactional, if user in fact doesn't have permissions to remove token -596		// tokens removed here will be restored after rejected transaction597		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {598			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);599			let PostDispatchInfo { actual_weight, .. } =600				<PalletStructure<T>>::burn_item_recursively(601					current_token_account.clone(),602					collection,603					token,604					self_budget,605					breadth_budget,606				)?;607			if let Some(actual_weight) = actual_weight {608				weight = weight.saturating_add(actual_weight);609			}610		}611612		Self::burn(collection, sender, token)?;613		DispatchResultWithPostInfo::Ok(PostDispatchInfo {614			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),615			pays_fee: Pays::Yes,616		})617	}618619	/// Batch operation to add, edit or remove properties for the token620	///621	/// All affected properties should have mutable permission and sender should have622	/// permission to edit those properties.623	///624	/// - `nesting_budget`: Limit for searching parents in depth to check ownership.625	/// - `is_token_create`: Indicates that method is called during token initialization.626	///   Allows to bypass ownership check.627	#[transactional]628	fn modify_token_properties(629		collection: &NonfungibleHandle<T>,630		sender: &T::CrossAccountId,631		token_id: TokenId,632		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,633		is_token_create: bool,634		nesting_budget: &dyn Budget,635	) -> DispatchResult {636		let mut collection_admin_status = None;637		let mut token_owner_result = None;638639		let mut is_collection_admin =640			|| *collection_admin_status.get_or_insert_with(|| collection.is_owner_or_admin(sender));641642		let mut is_token_owner = || {643			*token_owner_result.get_or_insert_with(|| -> Result<bool, DispatchError> {644				let is_owned = <PalletStructure<T>>::check_indirectly_owned(645					sender.clone(),646					collection.id,647					token_id,648					None,649					nesting_budget,650				)?;651652				Ok(is_owned)653			})654		};655656		for (key, value) in properties {657			let permission = <PalletCommon<T>>::property_permissions(collection.id)658				.get(&key)659				.cloned()660				.unwrap_or_else(PropertyPermission::none);661662			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))663				.get(&key)664				.is_some();665666			match permission {667				PropertyPermission { mutable: false, .. } if is_property_exists => {668					return Err(<CommonError<T>>::NoPermission.into());669				}670671				PropertyPermission {672					collection_admin,673					token_owner,674					..675				} => {676					//TODO: investigate threats during public minting.677					if is_token_create && (collection_admin || token_owner) && value.is_some() {678						// Pass679					} else if collection_admin && is_collection_admin() {680						// Pass681					} else if token_owner && is_token_owner()? {682						// Pass683					} else {684						fail!(<CommonError<T>>::NoPermission);685					}686				}687			}688689			match value {690				Some(value) => {691					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {692						properties.try_set(key.clone(), value)693					})694					.map_err(<CommonError<T>>::from)?;695696					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(697						collection.id,698						token_id,699						key,700					));701				}702				None => {703					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {704						properties.remove(&key)705					})706					.map_err(<CommonError<T>>::from)?;707708					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(709						collection.id,710						token_id,711						key,712					));713				}714			}715		}716717		Ok(())718	}719720	/// Batch operation to add or edit properties for the token721	///722	/// Same as [`modify_token_properties`] but doesn't allow to remove properties723	///724	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties725	pub fn set_token_properties(726		collection: &NonfungibleHandle<T>,727		sender: &T::CrossAccountId,728		token_id: TokenId,729		properties: impl Iterator<Item = Property>,730		is_token_create: bool,731		nesting_budget: &dyn Budget,732	) -> DispatchResult {733		Self::modify_token_properties(734			collection,735			sender,736			token_id,737			properties.map(|p| (p.key, Some(p.value))),738			is_token_create,739			nesting_budget,740		)741	}742743	/// Add or edit single property for the token744	///745	/// Calls [`set_token_properties`] internally746	///747	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties748	pub fn set_token_property(749		collection: &NonfungibleHandle<T>,750		sender: &T::CrossAccountId,751		token_id: TokenId,752		property: Property,753		nesting_budget: &dyn Budget,754	) -> DispatchResult {755		let is_token_create = false;756757		Self::set_token_properties(758			collection,759			sender,760			token_id,761			[property].into_iter(),762			is_token_create,763			nesting_budget,764		)765	}766767	/// Batch operation to remove properties from the token768	///769	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties770	///771	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties772	pub fn delete_token_properties(773		collection: &NonfungibleHandle<T>,774		sender: &T::CrossAccountId,775		token_id: TokenId,776		property_keys: impl Iterator<Item = PropertyKey>,777		nesting_budget: &dyn Budget,778	) -> DispatchResult {779		let is_token_create = false;780781		Self::modify_token_properties(782			collection,783			sender,784			token_id,785			property_keys.into_iter().map(|key| (key, None)),786			is_token_create,787			nesting_budget,788		)789	}790791	/// Remove single property from the token792	///793	/// Calls [`delete_token_properties`] internally794	///795	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties796	pub fn delete_token_property(797		collection: &NonfungibleHandle<T>,798		sender: &T::CrossAccountId,799		token_id: TokenId,800		property_key: PropertyKey,801		nesting_budget: &dyn Budget,802	) -> DispatchResult {803		Self::delete_token_properties(804			collection,805			sender,806			token_id,807			[property_key].into_iter(),808			nesting_budget,809		)810	}811812	/// Add or edit properties for the collection813	pub fn set_collection_properties(814		collection: &NonfungibleHandle<T>,815		sender: &T::CrossAccountId,816		properties: Vec<Property>,817	) -> DispatchResult {818		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)819	}820821	/// Remove properties from the collection822	pub fn delete_collection_properties(823		collection: &CollectionHandle<T>,824		sender: &T::CrossAccountId,825		property_keys: Vec<PropertyKey>,826	) -> DispatchResult {827		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)828	}829830	/// Set property permissions for the token.831	///832	/// Sender should be the owner or admin of token's collection.833	pub fn set_token_property_permissions(834		collection: &CollectionHandle<T>,835		sender: &T::CrossAccountId,836		property_permissions: Vec<PropertyKeyPermission>,837	) -> DispatchResult {838		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)839	}840841	/// Set property permissions for the collection.842	///843	/// Sender should be the owner or admin of the collection.844	pub fn set_property_permission(845		collection: &CollectionHandle<T>,846		sender: &T::CrossAccountId,847		permission: PropertyKeyPermission,848	) -> DispatchResult {849		<PalletCommon<T>>::set_property_permission(collection, sender, permission)850	}851852	/// Transfer NFT token from one account to another.853	///854	/// `from` account stops being the owner and `to` account becomes the owner of the token.855	/// If `to` is token than `to` becomes owner of the token and the token become nested.856	/// Unnests token from previous parent if it was nested before.857	/// Removes allowance for the token if there was any.858	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.859	///860	/// - `nesting_budget`: Limit for token nesting depth861	pub fn transfer(862		collection: &NonfungibleHandle<T>,863		from: &T::CrossAccountId,864		to: &T::CrossAccountId,865		token: TokenId,866		nesting_budget: &dyn Budget,867	) -> DispatchResult {868		ensure!(869			collection.limits.transfers_enabled(),870			<CommonError<T>>::TransferNotAllowed871		);872873		let token_data =874			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;875		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);876877		if collection.permissions.access() == AccessMode::AllowList {878			collection.check_allowlist(from)?;879			collection.check_allowlist(to)?;880		}881		<PalletCommon<T>>::ensure_correct_receiver(to)?;882883		let balance_from = <AccountBalance<T>>::get((collection.id, from))884			.checked_sub(1)885			.ok_or(<CommonError<T>>::TokenValueTooLow)?;886		let balance_to = if from != to {887			let balance_to = <AccountBalance<T>>::get((collection.id, to))888				.checked_add(1)889				.ok_or(ArithmeticError::Overflow)?;890891			ensure!(892				balance_to < collection.limits.account_token_ownership_limit(),893				<CommonError<T>>::AccountTokenLimitExceeded,894			);895896			Some(balance_to)897		} else {898			None899		};900901		<PalletStructure<T>>::nest_if_sent_to_token(902			from.clone(),903			to,904			collection.id,905			token,906			nesting_budget,907		)?;908909		// =========910911		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);912913		<TokenData<T>>::insert(914			(collection.id, token),915			ItemData {916				owner: to.clone(),917				..token_data918			},919		);920921		if let Some(balance_to) = balance_to {922			// from != to923			if balance_from == 0 {924				<AccountBalance<T>>::remove((collection.id, from));925			} else {926				<AccountBalance<T>>::insert((collection.id, from), balance_from);927			}928			<AccountBalance<T>>::insert((collection.id, to), balance_to);929			<Owned<T>>::remove((collection.id, from, token));930			<Owned<T>>::insert((collection.id, to, token), true);931		}932		Self::set_allowance_unchecked(collection, from, token, None, true);933934		<PalletEvm<T>>::deposit_log(935			ERC721Events::Transfer {936				from: *from.as_eth(),937				to: *to.as_eth(),938				token_id: token.into(),939			}940			.to_log(collection_id_to_address(collection.id)),941		);942		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(943			collection.id,944			token,945			from.clone(),946			to.clone(),947			1,948		));949		Ok(())950	}951952	/// Batch operation to mint multiple NFT tokens.953	///954	/// The sender should be the owner/admin of the collection or collection should be configured955	/// to allow public minting.956	/// Throws if amount of tokens reached it's limit for the collection or if caller reached957	/// token ownership limit.958	///959	/// - `data`: Contains list of token properties and users who will become the owners of the960	///   corresponging tokens.961	/// - `nesting_budget`: Limit for token nesting depth962	pub fn create_multiple_items(963		collection: &NonfungibleHandle<T>,964		sender: &T::CrossAccountId,965		data: Vec<CreateItemData<T>>,966		nesting_budget: &dyn Budget,967	) -> DispatchResult {968		if !collection.is_owner_or_admin(sender) {969			ensure!(970				collection.permissions.mint_mode(),971				<CommonError<T>>::PublicMintingNotAllowed972			);973			collection.check_allowlist(sender)?;974975			for item in data.iter() {976				collection.check_allowlist(&item.owner)?;977			}978		}979980		for data in data.iter() {981			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;982		}983984		let first_token = <TokensMinted<T>>::get(collection.id);985		let tokens_minted = first_token986			.checked_add(data.len() as u32)987			.ok_or(ArithmeticError::Overflow)?;988		ensure!(989			tokens_minted <= collection.limits.token_limit(),990			<CommonError<T>>::CollectionTokenLimitExceeded991		);992993		let mut balances = BTreeMap::new();994		for data in &data {995			let balance = balances996				.entry(&data.owner)997				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));998			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;9991000			ensure!(1001				*balance <= collection.limits.account_token_ownership_limit(),1002				<CommonError<T>>::AccountTokenLimitExceeded,1003			);1004		}10051006		for (i, data) in data.iter().enumerate() {1007			let token = TokenId(first_token + i as u32 + 1);10081009			<PalletStructure<T>>::check_nesting(1010				sender.clone(),1011				&data.owner,1012				collection.id,1013				token,1014				nesting_budget,1015			)?;1016		}10171018		// =========10191020		with_transaction(|| {1021			for (i, data) in data.iter().enumerate() {1022				let token = first_token + i as u32 + 1;10231024				<TokenData<T>>::insert(1025					(collection.id, token),1026					ItemData {1027						// const_data: data.const_data.clone(),1028						owner: data.owner.clone(),1029					},1030				);10311032				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(1033					&data.owner,1034					collection.id,1035					TokenId(token),1036				);10371038				if let Err(e) = Self::set_token_properties(1039					collection,1040					sender,1041					TokenId(token),1042					data.properties.clone().into_iter(),1043					true,1044					nesting_budget,1045				) {1046					return TransactionOutcome::Rollback(Err(e));1047				}1048			}1049			TransactionOutcome::Commit(Ok(()))1050		})?;10511052		<TokensMinted<T>>::insert(collection.id, tokens_minted);1053		for (account, balance) in balances {1054			<AccountBalance<T>>::insert((collection.id, account), balance);1055		}1056		for (i, data) in data.into_iter().enumerate() {1057			let token = first_token + i as u32 + 1;1058			<Owned<T>>::insert((collection.id, &data.owner, token), true);10591060			<PalletEvm<T>>::deposit_log(1061				ERC721Events::Transfer {1062					from: H160::default(),1063					to: *data.owner.as_eth(),1064					token_id: token.into(),1065				}1066				.to_log(collection_id_to_address(collection.id)),1067			);1068			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1069				collection.id,1070				TokenId(token),1071				data.owner.clone(),1072				1,1073			));1074		}1075		Ok(())1076	}10771078	pub fn set_allowance_unchecked(1079		collection: &NonfungibleHandle<T>,1080		sender: &T::CrossAccountId,1081		token: TokenId,1082		spender: Option<&T::CrossAccountId>,1083		assume_implicit_eth: bool,1084	) {1085		if let Some(spender) = spender {1086			let old_spender = <Allowance<T>>::get((collection.id, token));1087			<Allowance<T>>::insert((collection.id, token), spender);1088			// In ERC721 there is only one possible approved user of token, so we set1089			// approved user to spender1090			<PalletEvm<T>>::deposit_log(1091				ERC721Events::Approval {1092					owner: *sender.as_eth(),1093					approved: *spender.as_eth(),1094					token_id: token.into(),1095				}1096				.to_log(collection_id_to_address(collection.id)),1097			);1098			// In Unique chain, any token can have any amount of approved users, so we need to1099			// set allowance of old owner to 0, and allowance of new owner to 11100			if old_spender.as_ref() != Some(spender) {1101				if let Some(old_owner) = old_spender {1102					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1103						collection.id,1104						token,1105						sender.clone(),1106						old_owner,1107						0,1108					));1109				}1110				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1111					collection.id,1112					token,1113					sender.clone(),1114					spender.clone(),1115					1,1116				));1117			}1118		} else {1119			let old_spender = <Allowance<T>>::take((collection.id, token));1120			if !assume_implicit_eth {1121				// In ERC721 there is only one possible approved user of token, so we set1122				// approved user to zero address1123				<PalletEvm<T>>::deposit_log(1124					ERC721Events::Approval {1125						owner: *sender.as_eth(),1126						approved: H160::default(),1127						token_id: token.into(),1128					}1129					.to_log(collection_id_to_address(collection.id)),1130				);1131			}1132			// In Unique chain, any token can have any amount of approved users, so we need to1133			// set allowance of old owner to 01134			if let Some(old_spender) = old_spender {1135				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1136					collection.id,1137					token,1138					sender.clone(),1139					old_spender,1140					0,1141				));1142			}1143		}1144	}11451146	/// Set allowance for the spender to `transfer` or `burn` sender's token.1147	///1148	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1149	pub fn set_allowance(1150		collection: &NonfungibleHandle<T>,1151		sender: &T::CrossAccountId,1152		token: TokenId,1153		spender: Option<&T::CrossAccountId>,1154	) -> DispatchResult {1155		if collection.permissions.access() == AccessMode::AllowList {1156			collection.check_allowlist(sender)?;1157			if let Some(spender) = spender {1158				collection.check_allowlist(spender)?;1159			}1160		}11611162		if let Some(spender) = spender {1163			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1164		}11651166		let token_data =1167			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1168		if &token_data.owner != sender {1169			ensure!(1170				collection.ignores_owned_amount(sender),1171				<CommonError<T>>::CantApproveMoreThanOwned1172			);1173		}11741175		// =========11761177		Self::set_allowance_unchecked(collection, sender, token, spender, false);1178		Ok(())1179	}11801181	/// Checks allowance for the spender to use the token.1182	fn check_allowed(1183		collection: &NonfungibleHandle<T>,1184		spender: &T::CrossAccountId,1185		from: &T::CrossAccountId,1186		token: TokenId,1187		nesting_budget: &dyn Budget,1188	) -> DispatchResult {1189		if spender.conv_eq(from) {1190			return Ok(());1191		}1192		if collection.permissions.access() == AccessMode::AllowList {1193			// `from`, `to` checked in [`transfer`]1194			collection.check_allowlist(spender)?;1195		}11961197		if collection.limits.owner_can_transfer() && collection.is_owner_or_admin(spender) {1198			return Ok(());1199		}12001201		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1202			ensure!(1203				<PalletStructure<T>>::check_indirectly_owned(1204					spender.clone(),1205					source.0,1206					source.1,1207					None,1208					nesting_budget1209				)?,1210				<CommonError<T>>::ApprovedValueTooLow,1211			);1212			return Ok(());1213		}1214		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1215			return Ok(());1216		}1217		ensure!(1218			collection.ignores_allowance(spender),1219			<CommonError<T>>::ApprovedValueTooLow1220		);1221		Ok(())1222	}12231224	/// Transfer NFT token from one account to another.1225	///1226	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1227	/// The owner should set allowance for the spender to transfer token.1228	///1229	/// [`transfer`]: struct.Pallet.html#method.transfer1230	pub fn transfer_from(1231		collection: &NonfungibleHandle<T>,1232		spender: &T::CrossAccountId,1233		from: &T::CrossAccountId,1234		to: &T::CrossAccountId,1235		token: TokenId,1236		nesting_budget: &dyn Budget,1237	) -> DispatchResult {1238		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12391240		// =========12411242		// Allowance is reset in [`transfer`]1243		Self::transfer(collection, from, to, token, nesting_budget)1244	}12451246	/// Burn NFT token for `from` account.1247	///1248	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1249	/// set allowance for the spender to burn token.1250	///1251	/// [`burn`]: struct.Pallet.html#method.burn1252	pub fn burn_from(1253		collection: &NonfungibleHandle<T>,1254		spender: &T::CrossAccountId,1255		from: &T::CrossAccountId,1256		token: TokenId,1257		nesting_budget: &dyn Budget,1258	) -> DispatchResult {1259		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12601261		// =========12621263		Self::burn(collection, from, token)1264	}12651266	/// Check that `from` token could be nested in `under` token.1267	///1268	pub fn check_nesting(1269		handle: &NonfungibleHandle<T>,1270		sender: T::CrossAccountId,1271		from: (CollectionId, TokenId),1272		under: TokenId,1273		nesting_budget: &dyn Budget,1274	) -> DispatchResult {1275		let nesting = handle.permissions.nesting();12761277		#[cfg(not(feature = "runtime-benchmarks"))]1278		let permissive = false;1279		#[cfg(feature = "runtime-benchmarks")]1280		let permissive = nesting.permissive;12811282		if permissive {1283			// Pass1284		} else if nesting.token_owner1285			&& <PalletStructure<T>>::check_indirectly_owned(1286				sender.clone(),1287				handle.id,1288				under,1289				Some(from),1290				nesting_budget,1291			)? {1292			// Pass1293		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1294			// Pass1295		} else {1296			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1297		}12981299		if let Some(whitelist) = &nesting.restricted {1300			ensure!(1301				whitelist.contains(&from.0),1302				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1303			);1304		}1305		Ok(())1306	}13071308	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1309		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1310	}13111312	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1313		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1314	}13151316	fn collection_has_tokens(collection_id: CollectionId) -> bool {1317		<TokenData<T>>::iter_prefix((collection_id,))1318			.next()1319			.is_some()1320	}13211322	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1323		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1324			.next()1325			.is_some()1326	}13271328	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1329		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1330			.map(|((child_collection_id, child_id), _)| TokenChild {1331				collection: child_collection_id,1332				token: child_id,1333			})1334			.collect()1335	}13361337	/// Mint single NFT token.1338	///1339	/// Delegated to [`create_multiple_items`]1340	///1341	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1342	pub fn create_item(1343		collection: &NonfungibleHandle<T>,1344		sender: &T::CrossAccountId,1345		data: CreateItemData<T>,1346		nesting_budget: &dyn Budget,1347	) -> DispatchResult {1348		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1349	}1350}