git.delta.rocks / unique-network / refs/commits / d1f105e686c1

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`]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//! * Sender should be in collection's allow list to perform operations on tokens.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#[struct_versioning::versioned(version = 2, upper)]134#[derive(Encode, Decode, TypeInfo, MaxEncodedLen)]135pub struct ItemData<CrossAccountId> {136	#[version(..2)]137	pub const_data: BoundedVec<u8, CustomDataLimit>,138139	#[version(..2)]140	pub variable_data: BoundedVec<u8, CustomDataLimit>,141142	pub owner: CrossAccountId,143}144145#[frame_support::pallet]146pub mod pallet {147	use super::*;148	use frame_support::{149		Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key, traits::StorageVersion,150	};151	use frame_system::pallet_prelude::*;152	use up_data_structs::{CollectionId, TokenId};153	use super::weights::WeightInfo;154155	#[pallet::error]156	pub enum Error<T> {157		/// Not Nonfungible item data used to mint in Nonfungible collection.158		NotNonfungibleDataUsedToMintFungibleCollectionToken,159		/// Used amount > 1 with NFT160		NonfungibleItemsHaveNoAmount,161		/// Unable to burn NFT with children162		CantBurnNftWithChildren,163	}164165	#[pallet::config]166	pub trait Config:167		frame_system::Config + pallet_common::Config + pallet_structure::Config + pallet_evm::Config168	{169		type WeightInfo: WeightInfo;170	}171172	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);173174	#[pallet::pallet]175	#[pallet::storage_version(STORAGE_VERSION)]176	#[pallet::generate_store(pub(super) trait Store)]177	pub struct Pallet<T>(_);178179	/// Amount of tokens minted for collection.180	#[pallet::storage]181	pub type TokensMinted<T: Config> =182		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;183184	/// Amount of burnt tokens for collection.185	#[pallet::storage]186	pub type TokensBurnt<T: Config> =187		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u32, QueryKind = ValueQuery>;188189	/// Custom data serialized to bytes for token.190	#[pallet::storage]191	pub type TokenData<T: Config> = StorageNMap<192		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),193		Value = ItemData<T::CrossAccountId>,194		QueryKind = OptionQuery,195	>;196197	/// Key-Value map stored for token.198	#[pallet::storage]199	#[pallet::getter(fn token_properties)]200	pub type TokenProperties<T: Config> = StorageNMap<201		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),202		Value = Properties,203		QueryKind = ValueQuery,204		OnEmpty = up_data_structs::TokenProperties,205	>;206207	/// Custom data that is serialized to bytes and attached to a token property.208	#[pallet::storage]209	#[pallet::getter(fn token_aux_property)]210	pub type TokenAuxProperties<T: Config> = StorageNMap<211		Key = (212			Key<Twox64Concat, CollectionId>,213			Key<Twox64Concat, TokenId>,214			Key<Twox64Concat, PropertyScope>,215			Key<Twox64Concat, PropertyKey>,216		),217		Value = AuxPropertyValue,218		QueryKind = OptionQuery,219	>;220221	/// Used to enumerate tokens owned by account.222	#[pallet::storage]223	pub type Owned<T: Config> = StorageNMap<224		Key = (225			Key<Twox64Concat, CollectionId>,226			Key<Blake2_128Concat, T::CrossAccountId>,227			Key<Twox64Concat, TokenId>,228		),229		Value = bool,230		QueryKind = ValueQuery,231	>;232233	/// Used to enumerate token's children.234	#[pallet::storage]235	#[pallet::getter(fn token_children)]236	pub type TokenChildren<T: Config> = StorageNMap<237		Key = (238			Key<Twox64Concat, CollectionId>,239			Key<Twox64Concat, TokenId>,240			Key<Twox64Concat, (CollectionId, TokenId)>,241		),242		Value = bool,243		QueryKind = ValueQuery,244	>;245246	/// Amount of tokens owned by account.247	#[pallet::storage]248	pub type AccountBalance<T: Config> = StorageNMap<249		Key = (250			Key<Twox64Concat, CollectionId>,251			Key<Blake2_128Concat, T::CrossAccountId>,252		),253		Value = u32,254		QueryKind = ValueQuery,255	>;256257	/// Allowance set by an owner for a spender for a token.258	#[pallet::storage]259	pub type Allowance<T: Config> = StorageNMap<260		Key = (Key<Twox64Concat, CollectionId>, Key<Twox64Concat, TokenId>),261		Value = T::CrossAccountId,262		QueryKind = OptionQuery,263	>;264265	#[pallet::hooks]266	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {267		fn on_runtime_upgrade() -> Weight {268			if StorageVersion::get::<Pallet<T>>() < StorageVersion::new(1) {269				let mut had_consts = BTreeSet::new();270				<TokenData<T>>::translate::<ItemDataVersion1<T::CrossAccountId>, _>(271					|(collection, token), v| {272						let mut props = vec![];273						if !v.const_data.is_empty() {274							props.push(Property {275								key: b"_old_constData".to_vec().try_into().unwrap(),276								value: v277									.const_data278									.clone()279									.into_inner()280									.try_into()281									.expect("const too long"),282							});283							had_consts.insert(collection);284						}285						if !v.variable_data.is_empty() {286							props.push(Property {287								key: b"_old_variableData".to_vec().try_into().unwrap(),288								value: v289									.variable_data290									.clone()291									.into_inner()292									.try_into()293									.expect("variable too long"),294							})295						}296						if !props.is_empty() {297							Self::set_scoped_token_properties(298								collection,299								token,300								PropertyScope::None,301								props.into_iter(),302							)303							.expect("existing token data exceeds property storage");304						}305						Some(<ItemDataVersion2<T::CrossAccountId>>::from(v))306					},307				);308				for collection in had_consts {309					<PalletCommon<T>>::set_property_permission_unchecked(310						collection,311						PropertyKeyPermission {312							key: b"_old_constData".to_vec().try_into().unwrap(),313							permission: PropertyPermission {314								mutable: false,315								collection_admin: true,316								token_owner: false,317							},318						},319					)320					.expect("failed to configure permission");321				}322			}323324			0325		}326	}327}328329pub struct NonfungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);330impl<T: Config> NonfungibleHandle<T> {331	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {332		Self(inner)333	}334	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {335		self.0336	}337	pub fn common_mut(&mut self) -> &mut pallet_common::CollectionHandle<T> {338		&mut self.0339	}340}341impl<T: Config> WithRecorder<T> for NonfungibleHandle<T> {342	fn recorder(&self) -> &SubstrateRecorder<T> {343		self.0.recorder()344	}345	fn into_recorder(self) -> SubstrateRecorder<T> {346		self.0.into_recorder()347	}348}349impl<T: Config> Deref for NonfungibleHandle<T> {350	type Target = pallet_common::CollectionHandle<T>;351352	fn deref(&self) -> &Self::Target {353		&self.0354	}355}356357impl<T: Config> Pallet<T> {358	/// Get number of NFT tokens in collection.359	pub fn total_supply(collection: &NonfungibleHandle<T>) -> u32 {360		<TokensMinted<T>>::get(collection.id) - <TokensBurnt<T>>::get(collection.id)361	}362363	/// Check that NFT token exists.364	///365	/// - `token`: Token ID.366	pub fn token_exists(collection: &NonfungibleHandle<T>, token: TokenId) -> bool {367		<TokenData<T>>::contains_key((collection.id, token))368	}369370	/// Set the token property with the scope.371	///372	/// - `property`: Contains key-value pair.373	pub fn set_scoped_token_property(374		collection_id: CollectionId,375		token_id: TokenId,376		scope: PropertyScope,377		property: Property,378	) -> DispatchResult {379		TokenProperties::<T>::try_mutate((collection_id, token_id), |properties| {380			properties.try_scoped_set(scope, property.key, property.value)381		})382		.map_err(<CommonError<T>>::from)?;383384		Ok(())385	}386387	/// Batch operation to set multiple properties with the same scope.388	pub fn set_scoped_token_properties(389		collection_id: CollectionId,390		token_id: TokenId,391		scope: PropertyScope,392		properties: impl Iterator<Item = Property>,393	) -> DispatchResult {394		TokenProperties::<T>::try_mutate((collection_id, token_id), |stored_properties| {395			stored_properties.try_scoped_set_from_iter(scope, properties)396		})397		.map_err(<CommonError<T>>::from)?;398399		Ok(())400	}401402	/// Add or edit auxiliary data for the property.403	///404	/// - `f`: function that adds or edits auxiliary data.405	pub fn try_mutate_token_aux_property<R, E>(406		collection_id: CollectionId,407		token_id: TokenId,408		scope: PropertyScope,409		key: PropertyKey,410		f: impl FnOnce(&mut Option<AuxPropertyValue>) -> Result<R, E>,411	) -> Result<R, E> {412		<TokenAuxProperties<T>>::try_mutate((collection_id, token_id, scope, key), f)413	}414415	/// Remove auxiliary data for the property.416	pub fn remove_token_aux_property(417		collection_id: CollectionId,418		token_id: TokenId,419		scope: PropertyScope,420		key: PropertyKey,421	) {422		<TokenAuxProperties<T>>::remove((collection_id, token_id, scope, key));423	}424425	/// Get all auxiliary data in a given scope.426	///427	/// Returns iterator over Property Key - Data pairs.428	pub fn iterate_token_aux_properties(429		collection_id: CollectionId,430		token_id: TokenId,431		scope: PropertyScope,432	) -> impl Iterator<Item = (PropertyKey, AuxPropertyValue)> {433		<TokenAuxProperties<T>>::iter_prefix((collection_id, token_id, scope))434	}435436	/// Get ID of the last minted token437	pub fn current_token_id(collection_id: CollectionId) -> TokenId {438		TokenId(<TokensMinted<T>>::get(collection_id))439	}440}441442// unchecked calls skips any permission checks443impl<T: Config> Pallet<T> {444	/// Create ТFT collection445	///446	/// `init_collection` will take non-refundable deposit for collection creation.447	///448	/// - `data`: Contains settings for collection limits and permissions.449	pub fn init_collection(450		owner: T::CrossAccountId,451		data: CreateCollectionData<T::AccountId>,452		is_external: bool,453	) -> Result<CollectionId, DispatchError> {454		<PalletCommon<T>>::init_collection(owner, data, is_external)455	}456457	/// Destroy ТFT collection458	///459	/// `destroy_collection` will throw error if collection contains any tokens.460	/// Only owner can destroy collection.461	pub fn destroy_collection(462		collection: NonfungibleHandle<T>,463		sender: &T::CrossAccountId,464	) -> DispatchResult {465		let id = collection.id;466467		if Self::collection_has_tokens(id) {468			return Err(<CommonError<T>>::CantDestroyNotEmptyCollection.into());469		}470471		// =========472473		PalletCommon::destroy_collection(collection.0, sender)?;474475		<TokenData<T>>::remove_prefix((id,), None);476		<TokenChildren<T>>::remove_prefix((id,), None);477		<Owned<T>>::remove_prefix((id,), None);478		<TokensMinted<T>>::remove(id);479		<TokensBurnt<T>>::remove(id);480		<Allowance<T>>::remove_prefix((id,), None);481		<AccountBalance<T>>::remove_prefix((id,), None);482		Ok(())483	}484485	/// Burn NFT token486	///487	/// `burn` removes `token` from the `collection`, from it's owner and from the parent token488	/// if the token is nested.489	/// Only the owner can `burn` the token. The `token` shouldn't have any nested tokens.490	/// Also removes all corresponding properties and auxiliary properties.491	///492	/// - `token`: Token that should be burned493	/// - `collection`: Collection that contains the token494	pub fn burn(495		collection: &NonfungibleHandle<T>,496		sender: &T::CrossAccountId,497		token: TokenId,498	) -> DispatchResult {499		let token_data =500			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;501		ensure!(&token_data.owner == sender, <CommonError<T>>::NoPermission);502503		if collection.permissions.access() == AccessMode::AllowList {504			collection.check_allowlist(sender)?;505		}506507		if Self::token_has_children(collection.id, token) {508			return Err(<Error<T>>::CantBurnNftWithChildren.into());509		}510511		let burnt = <TokensBurnt<T>>::get(collection.id)512			.checked_add(1)513			.ok_or(ArithmeticError::Overflow)?;514515		let balance = <AccountBalance<T>>::get((collection.id, token_data.owner.clone()))516			.checked_sub(1)517			.ok_or(ArithmeticError::Overflow)?;518519		// =========520521		if balance == 0 {522			<AccountBalance<T>>::remove((collection.id, token_data.owner.clone()));523		} else {524			<AccountBalance<T>>::insert((collection.id, token_data.owner.clone()), balance);525		}526527		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);528529		<Owned<T>>::remove((collection.id, &token_data.owner, token));530		<TokensBurnt<T>>::insert(collection.id, burnt);531		<TokenData<T>>::remove((collection.id, token));532		<TokenProperties<T>>::remove((collection.id, token));533		<TokenAuxProperties<T>>::remove_prefix((collection.id, token), None);534		let old_spender = <Allowance<T>>::take((collection.id, token));535536		if let Some(old_spender) = old_spender {537			<PalletCommon<T>>::deposit_event(CommonEvent::Approved(538				collection.id,539				token,540				token_data.owner.clone(),541				old_spender,542				0,543			));544		}545546		<PalletEvm<T>>::deposit_log(547			ERC721Events::Transfer {548				from: *token_data.owner.as_eth(),549				to: H160::default(),550				token_id: token.into(),551			}552			.to_log(collection_id_to_address(collection.id)),553		);554		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(555			collection.id,556			token,557			token_data.owner,558			1,559		));560		Ok(())561	}562563	/// Same as [`burn`] but burns all the tokens that are nested in the token first564	///565	/// - `self_budget`: Limit for searching children in depth.566	/// - `breadth_budget`: Limit of breadth of searching children.567	///568	/// [`burn`]: struct.Pallet.html#method.burn569	#[transactional]570	pub fn burn_recursively(571		collection: &NonfungibleHandle<T>,572		sender: &T::CrossAccountId,573		token: TokenId,574		self_budget: &dyn Budget,575		breadth_budget: &dyn Budget,576	) -> DispatchResultWithPostInfo {577		ensure!(self_budget.consume(), <StructureError<T>>::DepthLimit,);578579		let current_token_account =580			T::CrossTokenAddressMapping::token_to_address(collection.id, token);581582		let mut weight = 0 as Weight;583584		// This method is transactional, if user in fact doesn't have permissions to remove token -585		// tokens removed here will be restored after rejected transaction586		for ((collection, token), _) in <TokenChildren<T>>::iter_prefix((collection.id, token)) {587			ensure!(breadth_budget.consume(), <StructureError<T>>::BreadthLimit,);588			let PostDispatchInfo { actual_weight, .. } =589				<PalletStructure<T>>::burn_item_recursively(590					current_token_account.clone(),591					collection,592					token,593					self_budget,594					breadth_budget,595				)?;596			if let Some(actual_weight) = actual_weight {597				weight = weight.saturating_add(actual_weight);598			}599		}600601		Self::burn(collection, sender, token)?;602		DispatchResultWithPostInfo::Ok(PostDispatchInfo {603			actual_weight: Some(weight + <SelfWeightOf<T>>::burn_item()),604			pays_fee: Pays::Yes,605		})606	}607608	/// Batch operation to add, edit or remove properties for the token609	///610	/// All affected properties should have mutable permission and sender should have611	/// permission to edit those properties.612	///613	/// - `nesting_budget`: Limit for searching parents in depth to check ownership.614	/// - `is_token_create`: Indicates that method is called during token initialization.615	///   Allows to bypass ownership check.616	#[transactional]617	fn modify_token_properties(618		collection: &NonfungibleHandle<T>,619		sender: &T::CrossAccountId,620		token_id: TokenId,621		properties: impl Iterator<Item = (PropertyKey, Option<PropertyValue>)>,622		is_token_create: bool,623		nesting_budget: &dyn Budget,624	) -> DispatchResult {625		let mut collection_admin_status = None;626		let mut token_owner_result = None;627628		let mut is_collection_admin =629			|| *collection_admin_status.get_or_insert_with(|| collection.is_owner_or_admin(sender));630631		let mut is_token_owner = || {632			*token_owner_result.get_or_insert_with(|| -> Result<bool, DispatchError> {633				let is_owned = <PalletStructure<T>>::check_indirectly_owned(634					sender.clone(),635					collection.id,636					token_id,637					None,638					nesting_budget,639				)?;640641				Ok(is_owned)642			})643		};644645		for (key, value) in properties {646			let permission = <PalletCommon<T>>::property_permissions(collection.id)647				.get(&key)648				.cloned()649				.unwrap_or_else(PropertyPermission::none);650651			let is_property_exists = TokenProperties::<T>::get((collection.id, token_id))652				.get(&key)653				.is_some();654655			match permission {656				PropertyPermission { mutable: false, .. } if is_property_exists => {657					return Err(<CommonError<T>>::NoPermission.into());658				}659660				PropertyPermission {661					collection_admin,662					token_owner,663					..664				} => {665					//TODO: investigate threats during public minting.666					if is_token_create && (collection_admin || token_owner) && value.is_some() {667						// Pass668					} else if collection_admin && is_collection_admin() {669						// Pass670					} else if token_owner && is_token_owner()? {671						// Pass672					} else {673						fail!(<CommonError<T>>::NoPermission);674					}675				}676			}677678			match value {679				Some(value) => {680					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {681						properties.try_set(key.clone(), value)682					})683					.map_err(<CommonError<T>>::from)?;684685					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertySet(686						collection.id,687						token_id,688						key,689					));690				}691				None => {692					<TokenProperties<T>>::try_mutate((collection.id, token_id), |properties| {693						properties.remove(&key)694					})695					.map_err(<CommonError<T>>::from)?;696697					<PalletCommon<T>>::deposit_event(CommonEvent::TokenPropertyDeleted(698						collection.id,699						token_id,700						key,701					));702				}703			}704		}705706		Ok(())707	}708709	/// Batch operation to add or edit properties for the token710	///711	/// Same as [`modify_token_properties`] but doesn't allow to remove properties712	///713	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties714	pub fn set_token_properties(715		collection: &NonfungibleHandle<T>,716		sender: &T::CrossAccountId,717		token_id: TokenId,718		properties: impl Iterator<Item = Property>,719		is_token_create: bool,720		nesting_budget: &dyn Budget,721	) -> DispatchResult {722		Self::modify_token_properties(723			collection,724			sender,725			token_id,726			properties.map(|p| (p.key, Some(p.value))),727			is_token_create,728			nesting_budget,729		)730	}731732	/// Add or edit single property for the token733	///734	/// Calls [`set_token_properties`] internally735	///736	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties737	pub fn set_token_property(738		collection: &NonfungibleHandle<T>,739		sender: &T::CrossAccountId,740		token_id: TokenId,741		property: Property,742		nesting_budget: &dyn Budget,743	) -> DispatchResult {744		let is_token_create = false;745746		Self::set_token_properties(747			collection,748			sender,749			token_id,750			[property].into_iter(),751			is_token_create,752			nesting_budget,753		)754	}755756	/// Batch operation to remove properties from the token757	///758	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties759	///760	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties761	pub fn delete_token_properties(762		collection: &NonfungibleHandle<T>,763		sender: &T::CrossAccountId,764		token_id: TokenId,765		property_keys: impl Iterator<Item = PropertyKey>,766		nesting_budget: &dyn Budget,767	) -> DispatchResult {768		let is_token_create = false;769770		Self::modify_token_properties(771			collection,772			sender,773			token_id,774			property_keys.into_iter().map(|key| (key, None)),775			is_token_create,776			nesting_budget,777		)778	}779780	/// Remove single property from the token781	///782	/// Calls [`delete_token_properties`] internally783	///784	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties785	pub fn delete_token_property(786		collection: &NonfungibleHandle<T>,787		sender: &T::CrossAccountId,788		token_id: TokenId,789		property_key: PropertyKey,790		nesting_budget: &dyn Budget,791	) -> DispatchResult {792		Self::delete_token_properties(793			collection,794			sender,795			token_id,796			[property_key].into_iter(),797			nesting_budget,798		)799	}800801	/// Add or edit properties for the collection802	pub fn set_collection_properties(803		collection: &NonfungibleHandle<T>,804		sender: &T::CrossAccountId,805		properties: Vec<Property>,806	) -> DispatchResult {807		<PalletCommon<T>>::set_collection_properties(collection, sender, properties)808	}809810	/// Remove properties from the collection811	pub fn delete_collection_properties(812		collection: &CollectionHandle<T>,813		sender: &T::CrossAccountId,814		property_keys: Vec<PropertyKey>,815	) -> DispatchResult {816		<PalletCommon<T>>::delete_collection_properties(collection, sender, property_keys)817	}818819	/// Set property permissions for the token.820	///821	/// Sender should be the owner or admin of token's collection.822	pub fn set_token_property_permissions(823		collection: &CollectionHandle<T>,824		sender: &T::CrossAccountId,825		property_permissions: Vec<PropertyKeyPermission>,826	) -> DispatchResult {827		<PalletCommon<T>>::set_token_property_permissions(collection, sender, property_permissions)828	}829830	/// Set property permissions for the collection.831	///832	/// Sender should be the owner or admin of the collection.833	pub fn set_property_permission(834		collection: &CollectionHandle<T>,835		sender: &T::CrossAccountId,836		permission: PropertyKeyPermission,837	) -> DispatchResult {838		<PalletCommon<T>>::set_property_permission(collection, sender, permission)839	}840841	/// Transfer NFT token from one account to another.842	///843	/// `from` account stops being the owner and `to` account becomes the owner of the token.844	/// If `to` is token than `to` becomes owner of the token and the token become nested.845	/// Unnests token from previous parent if it was nested before.846	/// Removes allowance for the token if there was any.847	/// Throws if transfers aren't allowed for collection or if receiver reached token ownership limit.848	///849	/// - `nesting_budget`: Limit for token nesting depth850	pub fn transfer(851		collection: &NonfungibleHandle<T>,852		from: &T::CrossAccountId,853		to: &T::CrossAccountId,854		token: TokenId,855		nesting_budget: &dyn Budget,856	) -> DispatchResult {857		ensure!(858			collection.limits.transfers_enabled(),859			<CommonError<T>>::TransferNotAllowed860		);861862		let token_data =863			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;864		ensure!(&token_data.owner == from, <CommonError<T>>::NoPermission);865866		if collection.permissions.access() == AccessMode::AllowList {867			collection.check_allowlist(from)?;868			collection.check_allowlist(to)?;869		}870		<PalletCommon<T>>::ensure_correct_receiver(to)?;871872		let balance_from = <AccountBalance<T>>::get((collection.id, from))873			.checked_sub(1)874			.ok_or(<CommonError<T>>::TokenValueTooLow)?;875		let balance_to = if from != to {876			let balance_to = <AccountBalance<T>>::get((collection.id, to))877				.checked_add(1)878				.ok_or(ArithmeticError::Overflow)?;879880			ensure!(881				balance_to < collection.limits.account_token_ownership_limit(),882				<CommonError<T>>::AccountTokenLimitExceeded,883			);884885			Some(balance_to)886		} else {887			None888		};889890		<PalletStructure<T>>::nest_if_sent_to_token(891			from.clone(),892			to,893			collection.id,894			token,895			nesting_budget,896		)?;897898		// =========899900		<PalletStructure<T>>::unnest_if_nested(&token_data.owner, collection.id, token);901902		<TokenData<T>>::insert(903			(collection.id, token),904			ItemData {905				owner: to.clone(),906				..token_data907			},908		);909910		if let Some(balance_to) = balance_to {911			// from != to912			if balance_from == 0 {913				<AccountBalance<T>>::remove((collection.id, from));914			} else {915				<AccountBalance<T>>::insert((collection.id, from), balance_from);916			}917			<AccountBalance<T>>::insert((collection.id, to), balance_to);918			<Owned<T>>::remove((collection.id, from, token));919			<Owned<T>>::insert((collection.id, to, token), true);920		}921		Self::set_allowance_unchecked(collection, from, token, None, true);922923		<PalletEvm<T>>::deposit_log(924			ERC721Events::Transfer {925				from: *from.as_eth(),926				to: *to.as_eth(),927				token_id: token.into(),928			}929			.to_log(collection_id_to_address(collection.id)),930		);931		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(932			collection.id,933			token,934			from.clone(),935			to.clone(),936			1,937		));938		Ok(())939	}940941	/// Batch operation to mint multiple NFT tokens.942	///943	/// The sender should be the owner/admin of the collection or collection should be configured944	/// to allow public minting.945	/// Throws if amount of tokens reached it's limit for the collection or if caller reached946	/// token ownership limit.947	///948	/// - `data`: Contains list of token properties and users who will become the owners of the949	///   corresponging tokens.950	/// - `nesting_budget`: Limit for token nesting depth951	pub fn create_multiple_items(952		collection: &NonfungibleHandle<T>,953		sender: &T::CrossAccountId,954		data: Vec<CreateItemData<T>>,955		nesting_budget: &dyn Budget,956	) -> DispatchResult {957		if !collection.is_owner_or_admin(sender) {958			ensure!(959				collection.permissions.mint_mode(),960				<CommonError<T>>::PublicMintingNotAllowed961			);962			collection.check_allowlist(sender)?;963964			for item in data.iter() {965				collection.check_allowlist(&item.owner)?;966			}967		}968969		for data in data.iter() {970			<PalletCommon<T>>::ensure_correct_receiver(&data.owner)?;971		}972973		let first_token = <TokensMinted<T>>::get(collection.id);974		let tokens_minted = first_token975			.checked_add(data.len() as u32)976			.ok_or(ArithmeticError::Overflow)?;977		ensure!(978			tokens_minted <= collection.limits.token_limit(),979			<CommonError<T>>::CollectionTokenLimitExceeded980		);981982		let mut balances = BTreeMap::new();983		for data in &data {984			let balance = balances985				.entry(&data.owner)986				.or_insert_with(|| <AccountBalance<T>>::get((collection.id, &data.owner)));987			*balance = balance.checked_add(1).ok_or(ArithmeticError::Overflow)?;988989			ensure!(990				*balance <= collection.limits.account_token_ownership_limit(),991				<CommonError<T>>::AccountTokenLimitExceeded,992			);993		}994995		for (i, data) in data.iter().enumerate() {996			let token = TokenId(first_token + i as u32 + 1);997998			<PalletStructure<T>>::check_nesting(999				sender.clone(),1000				&data.owner,1001				collection.id,1002				token,1003				nesting_budget,1004			)?;1005		}10061007		// =========10081009		with_transaction(|| {1010			for (i, data) in data.iter().enumerate() {1011				let token = first_token + i as u32 + 1;10121013				<TokenData<T>>::insert(1014					(collection.id, token),1015					ItemData {1016						// const_data: data.const_data.clone(),1017						owner: data.owner.clone(),1018					},1019				);10201021				<PalletStructure<T>>::nest_if_sent_to_token_unchecked(1022					&data.owner,1023					collection.id,1024					TokenId(token),1025				);10261027				if let Err(e) = Self::set_token_properties(1028					collection,1029					sender,1030					TokenId(token),1031					data.properties.clone().into_iter(),1032					true,1033					nesting_budget,1034				) {1035					return TransactionOutcome::Rollback(Err(e));1036				}1037			}1038			TransactionOutcome::Commit(Ok(()))1039		})?;10401041		<TokensMinted<T>>::insert(collection.id, tokens_minted);1042		for (account, balance) in balances {1043			<AccountBalance<T>>::insert((collection.id, account), balance);1044		}1045		for (i, data) in data.into_iter().enumerate() {1046			let token = first_token + i as u32 + 1;1047			<Owned<T>>::insert((collection.id, &data.owner, token), true);10481049			<PalletEvm<T>>::deposit_log(1050				ERC721Events::Transfer {1051					from: H160::default(),1052					to: *data.owner.as_eth(),1053					token_id: token.into(),1054				}1055				.to_log(collection_id_to_address(collection.id)),1056			);1057			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(1058				collection.id,1059				TokenId(token),1060				data.owner.clone(),1061				1,1062			));1063		}1064		Ok(())1065	}10661067	pub fn set_allowance_unchecked(1068		collection: &NonfungibleHandle<T>,1069		sender: &T::CrossAccountId,1070		token: TokenId,1071		spender: Option<&T::CrossAccountId>,1072		assume_implicit_eth: bool,1073	) {1074		if let Some(spender) = spender {1075			let old_spender = <Allowance<T>>::get((collection.id, token));1076			<Allowance<T>>::insert((collection.id, token), spender);1077			// In ERC721 there is only one possible approved user of token, so we set1078			// approved user to spender1079			<PalletEvm<T>>::deposit_log(1080				ERC721Events::Approval {1081					owner: *sender.as_eth(),1082					approved: *spender.as_eth(),1083					token_id: token.into(),1084				}1085				.to_log(collection_id_to_address(collection.id)),1086			);1087			// In Unique chain, any token can have any amount of approved users, so we need to1088			// set allowance of old owner to 0, and allowance of new owner to 11089			if old_spender.as_ref() != Some(spender) {1090				if let Some(old_owner) = old_spender {1091					<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1092						collection.id,1093						token,1094						sender.clone(),1095						old_owner,1096						0,1097					));1098				}1099				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1100					collection.id,1101					token,1102					sender.clone(),1103					spender.clone(),1104					1,1105				));1106			}1107		} else {1108			let old_spender = <Allowance<T>>::take((collection.id, token));1109			if !assume_implicit_eth {1110				// In ERC721 there is only one possible approved user of token, so we set1111				// approved user to zero address1112				<PalletEvm<T>>::deposit_log(1113					ERC721Events::Approval {1114						owner: *sender.as_eth(),1115						approved: H160::default(),1116						token_id: token.into(),1117					}1118					.to_log(collection_id_to_address(collection.id)),1119				);1120			}1121			// In Unique chain, any token can have any amount of approved users, so we need to1122			// set allowance of old owner to 01123			if let Some(old_spender) = old_spender {1124				<PalletCommon<T>>::deposit_event(CommonEvent::Approved(1125					collection.id,1126					token,1127					sender.clone(),1128					old_spender,1129					0,1130				));1131			}1132		}1133	}11341135	/// Set allowance for the spender to `transfer` or `burn` sender's token.1136	///1137	/// - `token`: Token the spender is allowed to `transfer` or `burn`.1138	pub fn set_allowance(1139		collection: &NonfungibleHandle<T>,1140		sender: &T::CrossAccountId,1141		token: TokenId,1142		spender: Option<&T::CrossAccountId>,1143	) -> DispatchResult {1144		if collection.permissions.access() == AccessMode::AllowList {1145			collection.check_allowlist(sender)?;1146			if let Some(spender) = spender {1147				collection.check_allowlist(spender)?;1148			}1149		}11501151		if let Some(spender) = spender {1152			<PalletCommon<T>>::ensure_correct_receiver(spender)?;1153		}11541155		let token_data =1156			<TokenData<T>>::get((collection.id, token)).ok_or(<CommonError<T>>::TokenNotFound)?;1157		if &token_data.owner != sender {1158			ensure!(1159				collection.ignores_owned_amount(sender),1160				<CommonError<T>>::CantApproveMoreThanOwned1161			);1162		}11631164		// =========11651166		Self::set_allowance_unchecked(collection, sender, token, spender, false);1167		Ok(())1168	}11691170	/// Checks allowance for the spender to use the token.1171	fn check_allowed(1172		collection: &NonfungibleHandle<T>,1173		spender: &T::CrossAccountId,1174		from: &T::CrossAccountId,1175		token: TokenId,1176		nesting_budget: &dyn Budget,1177	) -> DispatchResult {1178		if spender.conv_eq(from) {1179			return Ok(());1180		}1181		if collection.permissions.access() == AccessMode::AllowList {1182			// `from`, `to` checked in [`transfer`]1183			collection.check_allowlist(spender)?;1184		}11851186		if collection.limits.owner_can_transfer() && collection.is_owner_or_admin(spender) {1187			return Ok(());1188		}11891190		if let Some(source) = T::CrossTokenAddressMapping::address_to_token(from) {1191			ensure!(1192				<PalletStructure<T>>::check_indirectly_owned(1193					spender.clone(),1194					source.0,1195					source.1,1196					None,1197					nesting_budget1198				)?,1199				<CommonError<T>>::ApprovedValueTooLow,1200			);1201			return Ok(());1202		}1203		if <Allowance<T>>::get((collection.id, token)).as_ref() == Some(spender) {1204			return Ok(());1205		}1206		ensure!(1207			collection.ignores_allowance(spender),1208			<CommonError<T>>::ApprovedValueTooLow1209		);1210		Ok(())1211	}12121213	/// Transfer NFT token from one account to another.1214	///1215	/// Same as the [`transfer`] but spender doesn't needs to be the owner of the token.1216	/// The owner should set allowance for the spender to transfer token.1217	///1218	/// [`transfer`]: struct.Pallet.html#method.transfer1219	pub fn transfer_from(1220		collection: &NonfungibleHandle<T>,1221		spender: &T::CrossAccountId,1222		from: &T::CrossAccountId,1223		to: &T::CrossAccountId,1224		token: TokenId,1225		nesting_budget: &dyn Budget,1226	) -> DispatchResult {1227		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12281229		// =========12301231		// Allowance is reset in [`transfer`]1232		Self::transfer(collection, from, to, token, nesting_budget)1233	}12341235	/// Burn NFT token for `from` account.1236	///1237	/// Same as the [`burn`] but spender doesn't need to be an owner of the token. The owner should1238	/// set allowance for the spender to burn token.1239	///1240	/// [`burn`]: struct.Pallet.html#method.burn1241	pub fn burn_from(1242		collection: &NonfungibleHandle<T>,1243		spender: &T::CrossAccountId,1244		from: &T::CrossAccountId,1245		token: TokenId,1246		nesting_budget: &dyn Budget,1247	) -> DispatchResult {1248		Self::check_allowed(collection, spender, from, token, nesting_budget)?;12491250		// =========12511252		Self::burn(collection, from, token)1253	}12541255	/// Check that `from` token could be nested in `under` token.1256	///1257	pub fn check_nesting(1258		handle: &NonfungibleHandle<T>,1259		sender: T::CrossAccountId,1260		from: (CollectionId, TokenId),1261		under: TokenId,1262		nesting_budget: &dyn Budget,1263	) -> DispatchResult {1264		let nesting = handle.permissions.nesting();12651266		#[cfg(not(feature = "runtime-benchmarks"))]1267		let permissive = false;1268		#[cfg(feature = "runtime-benchmarks")]1269		let permissive = nesting.permissive;12701271		if permissive {1272			// Pass1273		} else if nesting.token_owner1274			&& <PalletStructure<T>>::check_indirectly_owned(1275				sender.clone(),1276				handle.id,1277				under,1278				Some(from),1279				nesting_budget,1280			)? {1281			// Pass1282		} else if nesting.collection_admin && handle.is_owner_or_admin(&sender) {1283			// Pass1284		} else {1285			fail!(<CommonError<T>>::UserIsNotAllowedToNest);1286		}12871288		if let Some(whitelist) = &nesting.restricted {1289			ensure!(1290				whitelist.contains(&from.0),1291				<CommonError<T>>::SourceCollectionIsNotAllowedToNest1292			);1293		}1294		Ok(())1295	}12961297	fn nest(under: (CollectionId, TokenId), to_nest: (CollectionId, TokenId)) {1298		<TokenChildren<T>>::insert((under.0, under.1, (to_nest.0, to_nest.1)), true);1299	}13001301	fn unnest(under: (CollectionId, TokenId), to_unnest: (CollectionId, TokenId)) {1302		<TokenChildren<T>>::remove((under.0, under.1, to_unnest));1303	}13041305	fn collection_has_tokens(collection_id: CollectionId) -> bool {1306		<TokenData<T>>::iter_prefix((collection_id,))1307			.next()1308			.is_some()1309	}13101311	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {1312		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1313			.next()1314			.is_some()1315	}13161317	pub fn token_children_ids(collection_id: CollectionId, token_id: TokenId) -> Vec<TokenChild> {1318		<TokenChildren<T>>::iter_prefix((collection_id, token_id))1319			.map(|((child_collection_id, child_id), _)| TokenChild {1320				collection: child_collection_id,1321				token: child_id,1322			})1323			.collect()1324	}13251326	/// Mint single NFT token.1327	///1328	/// Delegated to [`create_multiple_items`]1329	///1330	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items1331	pub fn create_item(1332		collection: &NonfungibleHandle<T>,1333		sender: &T::CrossAccountId,1334		data: CreateItemData<T>,1335		nesting_budget: &dyn Budget,1336	) -> DispatchResult {1337		Self::create_multiple_items(collection, sender, vec![data], nesting_budget)1338	}1339}