git.delta.rocks / unique-network / refs/commits / 57b97ca5400c

1//2// This file is subject to the terms and conditions defined in3// file 'LICENSE', which is part of this source code package.4//56#![recursion_limit = "1024"]7#![cfg_attr(not(feature = "std"), no_std)]8#![allow(9	clippy::too_many_arguments,10	clippy::unnecessary_mut_passed,11	clippy::unused_unit12)]1314extern crate alloc;1516pub use serde::{Serialize, Deserialize};1718pub use frame_support::{19	construct_runtime, decl_event, decl_module, decl_storage, decl_error,20	dispatch::DispatchResult,21	ensure, fail, parameter_types,22	traits::{23		Currency, ExistenceRequirement, Get, Imbalance, KeyOwnerProofSystem, OnUnbalanced,24		Randomness, IsSubType, WithdrawReasons,25	},26	weights::{27		constants::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, WEIGHT_PER_SECOND},28		DispatchInfo, GetDispatchInfo, IdentityFee, Pays, PostDispatchInfo, Weight,29		WeightToFeePolynomial, DispatchClass,30	},31	StorageValue, transactional,32};3334use frame_system::{self as system, ensure_signed};35use sp_core::H160;36use sp_std::vec;37use sp_runtime::{DispatchError, sp_std::prelude::Vec};38use core::ops::{Deref, DerefMut};39use nft_data_structs::{40	MAX_DECIMAL_POINTS, MAX_SPONSOR_TIMEOUT, MAX_TOKEN_OWNERSHIP, MAX_REFUNGIBLE_PIECES,41	CUSTOM_DATA_LIMIT, COLLECTION_NUMBER_LIMIT, ACCOUNT_TOKEN_OWNERSHIP_LIMIT,42	VARIABLE_ON_CHAIN_SCHEMA_LIMIT, CONST_ON_CHAIN_SCHEMA_LIMIT, COLLECTION_ADMINS_LIMIT,43	OFFCHAIN_SCHEMA_LIMIT, MAX_TOKEN_PREFIX_LENGTH, MAX_COLLECTION_NAME_LENGTH,44	MAX_COLLECTION_DESCRIPTION_LENGTH, AccessMode, Collection, CreateItemData, CollectionLimits,45	CollectionId, CollectionMode, TokenId, SchemaVersion, SponsorshipState, Ownership, NftItemType,46	MetaUpdatePermission, FungibleItemType, ReFungibleItemType,47};4849#[cfg(test)]50mod mock;5152#[cfg(test)]53mod tests;5455mod eth;56mod sponsorship;57pub use sponsorship::NftSponsorshipHandler;58pub use eth::sponsoring::NftEthSponsorshipHandler;5960pub use eth::NftErcSupport;61pub use eth::account::*;62use eth::erc::{ERC20Events, ERC721Events};6364#[cfg(feature = "runtime-benchmarks")]65mod benchmarking;66pub mod weights;67use weights::WeightInfo;6869decl_error! {70	/// Error for non-fungible-token module.71	pub enum Error for Module<T: Config> {72		/// Decimal_points parameter must be lower than MAX_DECIMAL_POINTS constant, currently it is 30.73		CollectionDecimalPointLimitExceeded,74		/// This address is not set as sponsor, use setCollectionSponsor first.75		ConfirmUnsetSponsorFail,76		/// Length of items properties must be greater than 0.77		EmptyArgument,78		/// Collection limit bounds per collection exceeded79		CollectionLimitBoundsExceeded,80		/// Tried to enable permissions which are only permitted to be disabled81		OwnerPermissionsCantBeReverted,82	}83}84pub trait Config:85	system::Config86	+ pallet_evm_coder_substrate::Config87	+ pallet_common::Config88	+ pallet_nonfungible::Config89	+ pallet_refungible::Config90	+ pallet_fungible::Config91	+ Sized92{93	/// Weight information for extrinsics in this pallet.94	type WeightInfo: WeightInfo;95}9697type SelfWeightOf<T> = <T as Config>::WeightInfo;9899trait WeightInfoHelpers: WeightInfo {100	fn transfer() -> Weight {101		Self::transfer_nft()102			.max(Self::transfer_fungible())103			.max(Self::transfer_refungible())104	}105	fn transfer_from() -> Weight {106		Self::transfer_from_nft()107			.max(Self::transfer_from_fungible())108			.max(Self::transfer_from_refungible())109	}110	fn approve() -> Weight {111		// TODO: refungible, fungible112		Self::approve_nft()113	}114	fn set_variable_meta_data(data: u32) -> Weight {115		// TODO: refungible116		Self::set_variable_meta_data_nft(data)117	}118	fn create_item(data: u32) -> Weight {119		Self::create_item_nft(data)120			.max(Self::create_item_fungible())121			.max(Self::create_item_refungible(data))122	}123	fn create_multiple_items(amount: u32) -> Weight {124		Self::create_multiple_items_nft(amount)125			.max(Self::create_multiple_items_fungible(amount))126			.max(Self::create_multiple_items_refungible(amount))127	}128	fn burn_item() -> Weight {129		// TODO: refungible, fungible130		Self::burn_item_nft()131	}132}133impl<T: WeightInfo> WeightInfoHelpers for T {}134135// # Used definitions136//137// ## User control levels138//139// chain-controlled - key is uncontrolled by user140//                    i.e autoincrementing index141//                    can use non-cryptographic hash142// real - key is controlled by user143//        but it is hard to generate enough colliding values, i.e owner of signed txs144//        can use non-cryptographic hash145// controlled - key is completly controlled by users146//              i.e maps with mutable keys147//              should use cryptographic hash148//149// ## User control level downgrade reasons150//151// ?1 - chain-controlled -> controlled152//      collections/tokens can be destroyed, resulting in massive holes153// ?2 - chain-controlled -> controlled154//      same as ?1, but can be only added, resulting in easier exploitation155// ?3 - real -> controlled156//      no confirmation required, so addresses can be easily generated157decl_storage! {158	trait Store for Module<T: Config> as Nft {159160		//#region Private members161		/// Used for migrations162		ChainVersion: u64;163		//#endregion164165		//#region Tokens transfer rate limit baskets166		/// (Collection id (controlled?2), who created (real))167		/// TODO: Off chain worker should remove from this map when collection gets removed168		pub CreateItemBasket get(fn create_item_basket): map hasher(blake2_128_concat) (CollectionId, T::AccountId) => T::BlockNumber;169		/// Collection id (controlled?2), token id (controlled?2)170		pub NftTransferBasket get(fn nft_transfer_basket): double_map hasher(blake2_128_concat) CollectionId, hasher(blake2_128_concat) TokenId => T::BlockNumber;171		/// Collection id (controlled?2), owning user (real)172		pub FungibleTransferBasket get(fn fungible_transfer_basket): double_map hasher(blake2_128_concat) CollectionId, hasher(twox_64_concat) T::AccountId => T::BlockNumber;173		/// Collection id (controlled?2), token id (controlled?2)174		pub ReFungibleTransferBasket get(fn refungible_transfer_basket): double_map hasher(blake2_128_concat) CollectionId, hasher(blake2_128_concat) TokenId => T::BlockNumber;175		//#endregion176177		/// Variable metadata sponsoring178		/// Collection id (controlled?2), token id (controlled?2)179		pub VariableMetaDataBasket get(fn variable_meta_data_basket): double_map hasher(blake2_128_concat) CollectionId, hasher(blake2_128_concat) TokenId => Option<T::BlockNumber> = None;180	}181}182183decl_module! {184	pub struct Module<T: Config> for enum Call185	where186		origin: T::Origin187	{188		const CollectionAdminsLimit: u64 = COLLECTION_ADMINS_LIMIT;189		type Error = Error<T>;190191		fn on_initialize(_now: T::BlockNumber) -> Weight {192			0193		}194195		/// This method creates a Collection of NFTs. Each Token may have multiple properties encoded as an array of bytes of certain length. The initial owner and admin of the collection are set to the address that signed the transaction. Both addresses can be changed later.196		///197		/// # Permissions198		///199		/// * Anyone.200		///201		/// # Arguments202		///203		/// * collection_name: UTF-16 string with collection name (limit 64 characters), will be stored as zero-terminated.204		///205		/// * collection_description: UTF-16 string with collection description (limit 256 characters), will be stored as zero-terminated.206		///207		/// * token_prefix: UTF-8 string with token prefix.208		///209		/// * mode: [CollectionMode] collection type and type dependent data.210		// returns collection ID211		#[weight = <SelfWeightOf<T>>::create_collection()]212		#[transactional]213		pub fn create_collection(origin,214								 collection_name: Vec<u16>,215								 collection_description: Vec<u16>,216								 token_prefix: Vec<u8>,217								 mode: CollectionMode) -> DispatchResult {218219			// Anyone can create a collection220			let who = ensure_signed(origin)?;221222			// Take a (non-refundable) deposit of collection creation223			let mut imbalance = <<<T as Config>::Currency as Currency<T::AccountId>>::PositiveImbalance>::zero();224			imbalance.subsume(<<T as Config>::Currency as Currency<T::AccountId>>::deposit_creating(225				&T::TreasuryAccountId::get(),226				T::CollectionCreationPrice::get(),227			));228			<T as Config>::Currency::settle(229				&who,230				imbalance,231				WithdrawReasons::TRANSFER,232				ExistenceRequirement::KeepAlive,233			).map_err(|_| Error::<T>::NoPermission)?;234235			let decimal_points = match mode {236				CollectionMode::Fungible(points) => points,237				_ => 0238			};239240			let created_count = CreatedCollectionCount::get();241			let destroyed_count = DestroyedCollectionCount::get();242243			// bound Total number of collections244			ensure!(created_count - destroyed_count < COLLECTION_NUMBER_LIMIT, Error::<T>::TotalCollectionsLimitExceeded);245246			// check params247			ensure!(decimal_points <= MAX_DECIMAL_POINTS, Error::<T>::CollectionDecimalPointLimitExceeded);248			ensure!(collection_name.len() <= MAX_COLLECTION_NAME_LENGTH, Error::<T>::CollectionNameLimitExceeded);249			ensure!(collection_description.len() <= MAX_COLLECTION_DESCRIPTION_LENGTH, Error::<T>::CollectionDescriptionLimitExceeded);250			ensure!(token_prefix.len() <= MAX_TOKEN_PREFIX_LENGTH, Error::<T>::CollectionTokenPrefixLimitExceeded);251252			// Generate next collection ID253			let next_id = created_count254				.checked_add(1)255				.ok_or(Error::<T>::NumOverflow)?;256257			CreatedCollectionCount::put(next_id);258259			let limits = CollectionLimits {260				sponsored_data_size: CUSTOM_DATA_LIMIT,261				..Default::default()262			};263264			// Create new collection265			let new_collection = Collection {266				owner: who.clone(),267				name: collection_name,268				mode: mode.clone(),269				mint_mode: false,270				access: AccessMode::Normal,271				description: collection_description,272				decimal_points,273				token_prefix,274				offchain_schema: Vec::new(),275				schema_version: SchemaVersion::ImageURL,276				sponsorship: SponsorshipState::Disabled,277				variable_on_chain_schema: Vec::new(),278				const_on_chain_schema: Vec::new(),279				limits,280				meta_update_permission: MetaUpdatePermission::default(),281				transfers_enabled: true,282			};283284			// Add new collection to map285			<CollectionById<T>>::insert(next_id, new_collection);286287			// call event288			Self::deposit_event(RawEvent::CollectionCreated(next_id, mode.id(), who));289290			Ok(())291		}292293		/// **DANGEROUS**: Destroys collection and all NFTs within this collection. Users irrecoverably lose their assets and may lose real money.294		///295		/// # Permissions296		///297		/// * Collection Owner.298		///299		/// # Arguments300		///301		/// * collection_id: collection to destroy.302		#[weight = <SelfWeightOf<T>>::destroy_collection()]303		#[transactional]304		pub fn destroy_collection(origin, collection_id: CollectionId) -> DispatchResult {305306			let sender = ensure_signed(origin)?;307			let collection = Self::get_collection(collection_id)?;308			Self::check_owner_permissions(&collection, &sender)?;309			if !collection.limits.owner_can_destroy {310				fail!(Error::<T>::NoPermission);311			}312313			<AddressTokens<T>>::remove_prefix(collection_id, None);314			<Allowances<T>>::remove_prefix(collection_id, None);315			<Balance<T>>::remove_prefix(collection_id, None);316			<ItemListIndex>::remove(collection_id);317			<AdminList<T>>::remove(collection_id);318			<CollectionById<T>>::remove(collection_id);319			<WhiteList<T>>::remove_prefix(collection_id, None);320321			<NftItemList<T>>::remove_prefix(collection_id, None);322			<FungibleItemList<T>>::remove_prefix(collection_id, None);323			<ReFungibleItemList<T>>::remove_prefix(collection_id, None);324325			<NftTransferBasket<T>>::remove_prefix(collection_id, None);326			<FungibleTransferBasket<T>>::remove_prefix(collection_id, None);327			<ReFungibleTransferBasket<T>>::remove_prefix(collection_id, None);328329			<VariableMetaDataBasket<T>>::remove_prefix(collection_id, None);330331			DestroyedCollectionCount::put(DestroyedCollectionCount::get()332				.checked_add(1)333				.ok_or(Error::<T>::NumOverflow)?);334335			Ok(())336		}337338		/// Add an address to white list.339		///340		/// # Permissions341		///342		/// * Collection Owner343		/// * Collection Admin344		///345		/// # Arguments346		///347		/// * collection_id.348		///349		/// * address.350		#[weight = <SelfWeightOf<T>>::add_to_white_list()]351		#[transactional]352		pub fn add_to_white_list(origin, collection_id: CollectionId, address: T::CrossAccountId) -> DispatchResult{353354			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);355			let collection = Self::get_collection(collection_id)?;356357			Self::toggle_white_list_internal(358				&sender,359				&collection,360				&address,361				true,362			)?;363364			Ok(())365		}366367		/// Remove an address from white list.368		///369		/// # Permissions370		///371		/// * Collection Owner372		/// * Collection Admin373		///374		/// # Arguments375		///376		/// * collection_id.377		///378		/// * address.379		#[weight = <SelfWeightOf<T>>::remove_from_white_list()]380		#[transactional]381		pub fn remove_from_white_list(origin, collection_id: CollectionId, address: T::CrossAccountId) -> DispatchResult{382383			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);384			let collection = Self::get_collection(collection_id)?;385386			Self::toggle_white_list_internal(387				&sender,388				&collection,389				&address,390				false,391			)?;392393			Ok(())394		}395396		/// Toggle between normal and white list access for the methods with access for `Anyone`.397		///398		/// # Permissions399		///400		/// * Collection Owner.401		///402		/// # Arguments403		///404		/// * collection_id.405		///406		/// * mode: [AccessMode]407		#[weight = <SelfWeightOf<T>>::set_public_access_mode()]408		#[transactional]409		pub fn set_public_access_mode(origin, collection_id: CollectionId, mode: AccessMode) -> DispatchResult410		{411			let sender = ensure_signed(origin)?;412413			let mut target_collection = Self::get_collection(collection_id)?;414			Self::check_owner_permissions(&target_collection, &sender)?;415			target_collection.access = mode;416			target_collection.save()417		}418419		/// Allows Anyone to create tokens if:420		/// * White List is enabled, and421		/// * Address is added to white list, and422		/// * This method was called with True parameter423		///424		/// # Permissions425		/// * Collection Owner426		///427		/// # Arguments428		///429		/// * collection_id.430		///431		/// * mint_permission: Boolean parameter. If True, allows minting to Anyone with conditions above.432		#[weight = <SelfWeightOf<T>>::set_mint_permission()]433		#[transactional]434		pub fn set_mint_permission(origin, collection_id: CollectionId, mint_permission: bool) -> DispatchResult435		{436			let sender = ensure_signed(origin)?;437438			let mut target_collection = Self::get_collection(collection_id)?;439			Self::check_owner_permissions(&target_collection, &sender)?;440			target_collection.mint_mode = mint_permission;441			target_collection.save()442		}443444		/// Change the owner of the collection.445		///446		/// # Permissions447		///448		/// * Collection Owner.449		///450		/// # Arguments451		///452		/// * collection_id.453		///454		/// * new_owner.455		#[weight = <SelfWeightOf<T>>::change_collection_owner()]456		#[transactional]457		pub fn change_collection_owner(origin, collection_id: CollectionId, new_owner: T::AccountId) -> DispatchResult {458459			let sender = ensure_signed(origin)?;460			let mut target_collection = Self::get_collection(collection_id)?;461			Self::check_owner_permissions(&target_collection, &sender)?;462			target_collection.owner = new_owner;463			target_collection.save()464		}465466		/// Adds an admin of the Collection.467		/// NFT Collection can be controlled by multiple admin addresses (some which can also be servers, for example). Admins can issue and burn NFTs, as well as add and remove other admins, but cannot change NFT or Collection ownership.468		///469		/// # Permissions470		///471		/// * Collection Owner.472		/// * Collection Admin.473		///474		/// # Arguments475		///476		/// * collection_id: ID of the Collection to add admin for.477		///478		/// * new_admin_id: Address of new admin to add.479		#[weight = <SelfWeightOf<T>>::add_collection_admin()]480		#[transactional]481		pub fn add_collection_admin(origin, collection_id: CollectionId, new_admin_id: T::CrossAccountId) -> DispatchResult {482			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);483			let collection = Self::get_collection(collection_id)?;484			Self::check_owner_or_admin_permissions(&collection, &sender)?;485			let mut admin_arr = <AdminList<T>>::get(collection_id);486487			match admin_arr.binary_search(&new_admin_id) {488				Ok(_) => {},489				Err(idx) => {490					ensure!(admin_arr.len() < COLLECTION_ADMINS_LIMIT as usize, Error::<T>::CollectionAdminsLimitExceeded);491					admin_arr.insert(idx, new_admin_id);492					<AdminList<T>>::insert(collection_id, admin_arr);493				}494			}495			Ok(())496		}497498		/// Remove admin address of the Collection. An admin address can remove itself. List of admins may become empty, in which case only Collection Owner will be able to add an Admin.499		///500		/// # Permissions501		///502		/// * Collection Owner.503		/// * Collection Admin.504		///505		/// # Arguments506		///507		/// * collection_id: ID of the Collection to remove admin for.508		///509		/// * account_id: Address of admin to remove.510		#[weight = <SelfWeightOf<T>>::remove_collection_admin()]511		#[transactional]512		pub fn remove_collection_admin(origin, collection_id: CollectionId, account_id: T::CrossAccountId) -> DispatchResult {513			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);514			let collection = Self::get_collection(collection_id)?;515			Self::check_owner_or_admin_permissions(&collection, &sender)?;516			let mut admin_arr = <AdminList<T>>::get(collection_id);517518			if let Ok(idx) = admin_arr.binary_search(&account_id) {519				admin_arr.remove(idx);520				<AdminList<T>>::insert(collection_id, admin_arr);521			}522			Ok(())523		}524525		/// # Permissions526		///527		/// * Collection Owner528		///529		/// # Arguments530		///531		/// * collection_id.532		///533		/// * new_sponsor.534		#[weight = <SelfWeightOf<T>>::set_collection_sponsor()]535		#[transactional]536		pub fn set_collection_sponsor(origin, collection_id: CollectionId, new_sponsor: T::AccountId) -> DispatchResult {537			let sender = ensure_signed(origin)?;538			let mut target_collection = Self::get_collection(collection_id)?;539			Self::check_owner_permissions(&target_collection, &sender)?;540541			target_collection.sponsorship = SponsorshipState::Unconfirmed(new_sponsor);542			target_collection.save()543		}544545		/// # Permissions546		///547		/// * Sponsor.548		///549		/// # Arguments550		///551		/// * collection_id.552		#[weight = <SelfWeightOf<T>>::confirm_sponsorship()]553		#[transactional]554		pub fn confirm_sponsorship(origin, collection_id: CollectionId) -> DispatchResult {555			let sender = ensure_signed(origin)?;556557			let mut target_collection = Self::get_collection(collection_id)?;558			ensure!(559				target_collection.sponsorship.pending_sponsor() == Some(&sender),560				Error::<T>::ConfirmUnsetSponsorFail561			);562563			target_collection.sponsorship = SponsorshipState::Confirmed(sender);564			target_collection.save()565		}566567		/// Switch back to pay-per-own-transaction model.568		///569		/// # Permissions570		///571		/// * Collection owner.572		///573		/// # Arguments574		///575		/// * collection_id.576		#[weight = <SelfWeightOf<T>>::remove_collection_sponsor()]577		#[transactional]578		pub fn remove_collection_sponsor(origin, collection_id: CollectionId) -> DispatchResult {579			let sender = ensure_signed(origin)?;580581			let mut target_collection = Self::get_collection(collection_id)?;582			Self::check_owner_permissions(&target_collection, &sender)?;583584			target_collection.sponsorship = SponsorshipState::Disabled;585			target_collection.save()586		}587588		/// This method creates a concrete instance of NFT Collection created with CreateCollection method.589		///590		/// # Permissions591		///592		/// * Collection Owner.593		/// * Collection Admin.594		/// * Anyone if595		///     * White List is enabled, and596		///     * Address is added to white list, and597		///     * MintPermission is enabled (see SetMintPermission method)598		///599		/// # Arguments600		///601		/// * collection_id: ID of the collection.602		///603		/// * owner: Address, initial owner of the NFT.604		///605		/// * data: Token data to store on chain.606		// #[weight =607		// (130_000_000 as Weight)608		// .saturating_add((2135 as Weight).saturating_mul((properties.len() as u64) as Weight))609		// .saturating_add(RocksDbWeight::get().reads(10 as Weight))610		// .saturating_add(RocksDbWeight::get().writes(8 as Weight))]611612		#[weight = <SelfWeightOf<T>>::create_item(data.data_size() as u32)]613		#[transactional]614		pub fn create_item(origin, collection_id: CollectionId, owner: T::CrossAccountId, data: CreateItemData) -> DispatchResult {615			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);616			let collection = Self::get_collection(collection_id)?;617618			Self::create_item_internal(&sender, &collection, &owner, data)?;619620			collection.submit_logs()621		}622623		/// This method creates multiple items in a collection created with CreateCollection method.624		///625		/// # Permissions626		///627		/// * Collection Owner.628		/// * Collection Admin.629		/// * Anyone if630		///     * White List is enabled, and631		///     * Address is added to white list, and632		///     * MintPermission is enabled (see SetMintPermission method)633		///634		/// # Arguments635		///636		/// * collection_id: ID of the collection.637		///638		/// * itemsData: Array items properties. Each property is an array of bytes itself, see [create_item].639		///640		/// * owner: Address, initial owner of the NFT.641		#[weight = <SelfWeightOf<T>>::create_multiple_items(items_data.len() as u32)]642		#[transactional]643		pub fn create_multiple_items(origin, collection_id: CollectionId, owner: T::CrossAccountId, items_data: Vec<CreateItemData>) -> DispatchResult {644645			ensure!(!items_data.is_empty(), Error::<T>::EmptyArgument);646			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);647			let collection = Self::get_collection(collection_id)?;648649			Self::create_multiple_items_internal(&sender, &collection, &owner, items_data)?;650651			collection.submit_logs()652		}653654		// TODO! transaction weight655656		/// Set transfers_enabled value for particular collection657		///658		/// # Permissions659		///660		/// * Collection Owner.661		///662		/// # Arguments663		///664		/// * collection_id: ID of the collection.665		///666		/// * value: New flag value.667		#[weight = <SelfWeightOf<T>>::set_transfers_enabled_flag()]668		#[transactional]669		pub fn set_transfers_enabled_flag(origin, collection_id: CollectionId, value: bool) -> DispatchResult {670671			let sender = ensure_signed(origin)?;672			let mut target_collection = Self::get_collection(collection_id)?;673674			Self::check_owner_permissions(&target_collection, &sender)?;675676			target_collection.transfers_enabled = value;677			target_collection.save()678		}679680		// TODO! transaction weight681		/// Set meta_update_permission value for particular collection682		///683		/// # Permissions684		///685		/// * Collection Owner.686		///687		/// # Arguments688		///689		/// * collection_id: ID of the collection.690		///691		/// * value: New flag value.692		#[weight = <T as Config>::WeightInfo::burn_item()]693		#[transactional]694		pub fn set_meta_update_permission_flag(origin, collection_id: CollectionId, value: MetaUpdatePermission) -> DispatchResult {695696			let sender = ensure_signed(origin)?;697			let mut target_collection = Self::get_collection(collection_id)?;698699			ensure!(700				target_collection.meta_update_permission != MetaUpdatePermission::None,701				Error::<T>::MetadataFlagFrozen702			);703			Self::check_owner_permissions(&target_collection, &sender)?;704705			target_collection.meta_update_permission = value;706707			target_collection.save()708		}709710		/// Destroys a concrete instance of NFT.711		///712		/// # Permissions713		///714		/// * Collection Owner.715		/// * Collection Admin.716		/// * Current NFT Owner.717		///718		/// # Arguments719		///720		/// * collection_id: ID of the collection.721		///722		/// * item_id: ID of NFT to burn.723		#[weight = <SelfWeightOf<T>>::burn_item()]724		#[transactional]725		pub fn burn_item(origin, collection_id: CollectionId, item_id: TokenId, value: u128) -> DispatchResult {726727			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);728			let target_collection = Self::get_collection(collection_id)?;729730			Self::burn_item_internal(&sender, &target_collection, item_id, value)?;731732			target_collection.submit_logs()733		}734735		/// Change ownership of the token.736		///737		/// # Permissions738		///739		/// * Collection Owner740		/// * Collection Admin741		/// * Current NFT owner742		///743		/// # Arguments744		///745		/// * recipient: Address of token recipient.746		///747		/// * collection_id.748		///749		/// * item_id: ID of the item750		///     * Non-Fungible Mode: Required.751		///     * Fungible Mode: Ignored.752		///     * Re-Fungible Mode: Required.753		///754		/// * value: Amount to transfer.755		///     * Non-Fungible Mode: Ignored756		///     * Fungible Mode: Must specify transferred amount757		///     * Re-Fungible Mode: Must specify transferred portion (between 0 and 1)758		#[weight = <SelfWeightOf<T>>::transfer()]759		#[transactional]760		pub fn transfer(origin, recipient: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, value: u128) -> DispatchResult {761			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);762			let collection = Self::get_collection(collection_id)?;763764			Self::transfer_internal(&sender, &recipient, &collection, item_id, value)?;765766			collection.submit_logs()767		}768769		/// Set, change, or remove approved address to transfer the ownership of the NFT.770		///771		/// # Permissions772		///773		/// * Collection Owner774		/// * Collection Admin775		/// * Current NFT owner776		///777		/// # Arguments778		///779		/// * approved: Address that is approved to transfer this NFT or zero (if needed to remove approval).780		///781		/// * collection_id.782		///783		/// * item_id: ID of the item.784		#[weight = <SelfWeightOf<T>>::approve()]785		#[transactional]786		pub fn approve(origin, spender: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, amount: u128) -> DispatchResult {787			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);788			let collection = Self::get_collection(collection_id)?;789790			Self::approve_internal(&sender, &spender, &collection, item_id, amount)?;791792			collection.submit_logs()793		}794795		/// Change ownership of a NFT on behalf of the owner. See Approve method for additional information. After this method executes, the approval is removed so that the approved address will not be able to transfer this NFT again from this owner.796		///797		/// # Permissions798		/// * Collection Owner799		/// * Collection Admin800		/// * Current NFT owner801		/// * Address approved by current NFT owner802		///803		/// # Arguments804		///805		/// * from: Address that owns token.806		///807		/// * recipient: Address of token recipient.808		///809		/// * collection_id.810		///811		/// * item_id: ID of the item.812		///813		/// * value: Amount to transfer.814		#[weight = <SelfWeightOf<T>>::transfer_from()]815		#[transactional]816		pub fn transfer_from(origin, from: T::CrossAccountId, recipient: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, value: u128 ) -> DispatchResult {817			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);818			let collection = Self::get_collection(collection_id)?;819820			Self::transfer_from_internal(&sender, &from, &recipient, &collection, item_id, value)?;821822			collection.submit_logs()823		}824		// #[weight = 0]825		//     // let no_perm_mes = "You do not have permissions to modify this collection";826		//     // ensure!(<ApprovedList<T>>::contains_key((collection_id, item_id)), no_perm_mes);827		//     // let list_itm = <ApprovedList<T>>::get((collection_id, item_id));828		//     // ensure!(list_itm.contains(&new_owner.clone()), no_perm_mes);829830		//     // // on_nft_received  call831832		//     // Self::transfer(origin, collection_id, item_id, new_owner)?;833834		//     Ok(())835		// }836837		/// Set off-chain data schema.838		///839		/// # Permissions840		///841		/// * Collection Owner842		/// * Collection Admin843		///844		/// # Arguments845		///846		/// * collection_id.847		///848		/// * schema: String representing the offchain data schema.849		#[weight = <SelfWeightOf<T>>::set_variable_meta_data(data.len() as u32)]850		#[transactional]851		pub fn set_variable_meta_data (852			origin,853			collection_id: CollectionId,854			item_id: TokenId,855			data: Vec<u8>856		) -> DispatchResult {857			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);858859			let collection = Self::get_collection(collection_id)?;860			Self::meta_update_check(&sender, &collection, item_id)?;861862			Self::set_variable_meta_data_internal(&sender, &collection, item_id, data)?;863864			Ok(())865		}866867		/// Set schema standard868		/// ImageURL869		/// Unique870		///871		/// # Permissions872		///873		/// * Collection Owner874		/// * Collection Admin875		///876		/// # Arguments877		///878		/// * collection_id.879		///880		/// * schema: SchemaVersion: enum881		#[weight = <SelfWeightOf<T>>::set_schema_version()]882		#[transactional]883		pub fn set_schema_version(884			origin,885			collection_id: CollectionId,886			version: SchemaVersion887		) -> DispatchResult {888			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);889			let mut target_collection = Self::get_collection(collection_id)?;890			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;891			target_collection.schema_version = version;892			target_collection.save()893		}894895		/// Set off-chain data schema.896		///897		/// # Permissions898		///899		/// * Collection Owner900		/// * Collection Admin901		///902		/// # Arguments903		///904		/// * collection_id.905		///906		/// * schema: String representing the offchain data schema.907		#[weight = <SelfWeightOf<T>>::set_offchain_schema(schema.len() as u32)]908		#[transactional]909		pub fn set_offchain_schema(910			origin,911			collection_id: CollectionId,912			schema: Vec<u8>913		) -> DispatchResult {914			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);915			let mut target_collection = Self::get_collection(collection_id)?;916			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;917918			// check schema limit919			ensure!(schema.len() as u32 <= OFFCHAIN_SCHEMA_LIMIT, "");920921			target_collection.offchain_schema = schema;922			target_collection.save()923		}924925		/// Set const on-chain data schema.926		///927		/// # Permissions928		///929		/// * Collection Owner930		/// * Collection Admin931		///932		/// # Arguments933		///934		/// * collection_id.935		///936		/// * schema: String representing the const on-chain data schema.937		#[weight = <SelfWeightOf<T>>::set_const_on_chain_schema(schema.len() as u32)]938		#[transactional]939		pub fn set_const_on_chain_schema (940			origin,941			collection_id: CollectionId,942			schema: Vec<u8>943		) -> DispatchResult {944			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);945			let mut target_collection = Self::get_collection(collection_id)?;946			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;947948			// check schema limit949			ensure!(schema.len() as u32 <= CONST_ON_CHAIN_SCHEMA_LIMIT, "");950951			target_collection.const_on_chain_schema = schema;952			target_collection.save()953		}954955		/// Set variable on-chain data schema.956		///957		/// # Permissions958		///959		/// * Collection Owner960		/// * Collection Admin961		///962		/// # Arguments963		///964		/// * collection_id.965		///966		/// * schema: String representing the variable on-chain data schema.967		#[weight = <SelfWeightOf<T>>::set_const_on_chain_schema(schema.len() as u32)]968		#[transactional]969		pub fn set_variable_on_chain_schema (970			origin,971			collection_id: CollectionId,972			schema: Vec<u8>973		) -> DispatchResult {974			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);975			let mut target_collection = Self::get_collection(collection_id)?;976			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;977978			// check schema limit979			ensure!(schema.len() as u32 <= VARIABLE_ON_CHAIN_SCHEMA_LIMIT, "");980981			target_collection.variable_on_chain_schema = schema;982			target_collection.save()983		}984985		#[weight = <SelfWeightOf<T>>::set_collection_limits()]986		#[transactional]987		pub fn set_collection_limits(988			origin,989			collection_id: u32,990			new_limits: CollectionLimits<T::BlockNumber>,991		) -> DispatchResult {992			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);993			let mut target_collection = Self::get_collection(collection_id)?;994			Self::check_owner_permissions(&target_collection, sender.as_sub())?;995			let old_limits = &target_collection.limits;996997			// collection bounds998			ensure!(new_limits.sponsor_transfer_timeout <= MAX_SPONSOR_TIMEOUT &&999				new_limits.account_token_ownership_limit <= MAX_TOKEN_OWNERSHIP &&1000				new_limits.sponsored_data_size <= CUSTOM_DATA_LIMIT,1001				Error::<T>::CollectionLimitBoundsExceeded);10021003			// token_limit   check  prev1004			ensure!(old_limits.token_limit >= new_limits.token_limit, Error::<T>::CollectionTokenLimitExceeded);1005			ensure!(new_limits.token_limit > 0, Error::<T>::CollectionTokenLimitExceeded);10061007			ensure!(1008				(old_limits.owner_can_transfer || !new_limits.owner_can_transfer) &&1009				(old_limits.owner_can_destroy || !new_limits.owner_can_destroy),1010				Error::<T>::OwnerPermissionsCantBeReverted,1011			);10121013			target_collection.limits = new_limits;10141015			target_collection.save()1016		}1017	}1018}10191020impl<T: Config> Module<T> {1021	pub fn create_item_internal(1022		sender: &T::CrossAccountId,1023		collection: &CollectionHandle<T>,1024		owner: &T::CrossAccountId,1025		data: CreateItemData,1026	) -> DispatchResult {1027		ensure!(1028			owner != &T::CrossAccountId::from_eth(H160([0; 20])),1029			Error::<T>::AddressIsZero1030		);10311032		Self::can_create_items_in_collection(collection, sender, owner, 1)?;1033		Self::validate_create_item_args(collection, &data)?;1034		Self::create_item_no_validation(collection, owner, data)?;10351036		Ok(())1037	}10381039	pub fn transfer_internal(1040		sender: &T::CrossAccountId,1041		recipient: &T::CrossAccountId,1042		target_collection: &CollectionHandle<T>,1043		item_id: TokenId,1044		value: u128,1045	) -> DispatchResult {1046		ensure!(1047			recipient != &T::CrossAccountId::from_eth(H160([0; 20])),1048			Error::<T>::AddressIsZero1049		);10501051		// Limits check1052		Self::is_correct_transfer(target_collection, recipient)?;10531054		// Transfer permissions check1055		ensure!(1056			Self::is_item_owner(sender, target_collection, item_id)?1057				|| Self::is_owner_or_admin_permissions(target_collection, sender)?,1058			Error::<T>::NoPermission1059		);10601061		if target_collection.access == AccessMode::WhiteList {1062			Self::check_white_list(target_collection, sender)?;1063			Self::check_white_list(target_collection, recipient)?;1064		}10651066		match target_collection.mode {1067			CollectionMode::NFT => Self::transfer_nft(1068				target_collection,1069				item_id,1070				sender.clone(),1071				recipient.clone(),1072			)?,1073			CollectionMode::Fungible(_) => {1074				Self::transfer_fungible(target_collection, value, sender, recipient)?1075			}1076			CollectionMode::ReFungible => Self::transfer_refungible(1077				target_collection,1078				item_id,1079				value,1080				sender.clone(),1081				recipient.clone(),1082			)?,1083		};10841085		Self::deposit_event(RawEvent::Transfer(1086			target_collection.id,1087			item_id,1088			sender.clone(),1089			recipient.clone(),1090			value,1091		));10921093		Ok(())1094	}10951096	pub fn approve_internal(1097		sender: &T::CrossAccountId,1098		spender: &T::CrossAccountId,1099		collection: &CollectionHandle<T>,1100		item_id: TokenId,1101		amount: u128,1102	) -> DispatchResult {1103		Self::token_exists(collection, item_id)?;11041105		// Transfer permissions check1106		let bypasses_limits = collection.limits.owner_can_transfer1107			&& Self::is_owner_or_admin_permissions(collection, sender)?;11081109		let allowance_limit = if bypasses_limits {1110			None1111		} else if let Some(amount) = Self::owned_amount(sender, collection, item_id)? {1112			Some(amount)1113		} else {1114			fail!(Error::<T>::NoPermission);1115		};11161117		if collection.access == AccessMode::WhiteList {1118			Self::check_white_list(collection, sender)?;1119			Self::check_white_list(collection, spender)?;1120		}11211122		collection.consume_sload()?;1123		let allowance: u128 = amount1124			.checked_add(<Allowances<T>>::get(1125				collection.id,1126				(item_id, sender.as_sub(), spender.as_sub()),1127			))1128			.ok_or(Error::<T>::NumOverflow)?;1129		if let Some(limit) = allowance_limit {1130			ensure!(limit >= allowance, Error::<T>::TokenValueTooLow);1131		}1132		collection.consume_sstore()?;1133		<Allowances<T>>::insert(1134			collection.id,1135			(item_id, sender.as_sub(), spender.as_sub()),1136			allowance,1137		);11381139		if matches!(collection.mode, CollectionMode::NFT) {1140			// TODO: NFT: only one owner may exist for token in ERC7211141			collection.log(ERC721Events::Approval {1142				owner: *sender.as_eth(),1143				approved: *spender.as_eth(),1144				token_id: item_id.into(),1145			})?;1146		}11471148		if matches!(collection.mode, CollectionMode::Fungible(_)) {1149			// TODO: NFT: only one owner may exist for token in ERC201150			collection.log(ERC20Events::Approval {1151				owner: *sender.as_eth(),1152				spender: *spender.as_eth(),1153				value: allowance.into(),1154			})?;1155		}11561157		Self::deposit_event(RawEvent::Approved(1158			collection.id,1159			item_id,1160			sender.clone(),1161			spender.clone(),1162			allowance,1163		));1164		Ok(())1165	}11661167	pub fn transfer_from_internal(1168		sender: &T::CrossAccountId,1169		from: &T::CrossAccountId,1170		recipient: &T::CrossAccountId,1171		collection: &CollectionHandle<T>,1172		item_id: TokenId,1173		amount: u128,1174	) -> DispatchResult {1175		if sender == from {1176			// Transfer by `from`, because it is either equal to sender, or derived from him1177			return Self::transfer_internal(from, recipient, collection, item_id, amount);1178		}11791180		// Check approval1181		collection.consume_sload()?;1182		let approval: u128 =1183			<Allowances<T>>::get(collection.id, (item_id, from.as_sub(), sender.as_sub()));11841185		// Limits check1186		Self::is_correct_transfer(collection, recipient)?;11871188		// Transfer permissions check1189		ensure!(1190			approval >= amount1191				|| (collection.limits.owner_can_transfer1192					&& Self::is_owner_or_admin_permissions(collection, sender)?),1193			Error::<T>::NoPermission1194		);11951196		if collection.access == AccessMode::WhiteList {1197			Self::check_white_list(collection, sender)?;1198			Self::check_white_list(collection, recipient)?;1199		}12001201		// Reduce approval by transferred amount or remove if remaining approval drops to 01202		let allowance = approval.saturating_sub(amount);1203		collection.consume_sstore()?;1204		if allowance > 0 {1205			<Allowances<T>>::insert(1206				collection.id,1207				(item_id, from.as_sub(), sender.as_sub()),1208				allowance,1209			);1210		} else {1211			<Allowances<T>>::remove(collection.id, (item_id, from.as_sub(), sender.as_sub()));1212		}12131214		match collection.mode {1215			CollectionMode::NFT => {1216				Self::transfer_nft(collection, item_id, from.clone(), recipient.clone())?1217			}1218			CollectionMode::Fungible(_) => {1219				Self::transfer_fungible(collection, amount, from, recipient)?1220			}1221			CollectionMode::ReFungible => Self::transfer_refungible(1222				collection,1223				item_id,1224				amount,1225				from.clone(),1226				recipient.clone(),1227			)?,1228		};12291230		if matches!(collection.mode, CollectionMode::Fungible(_)) {1231			collection.log(ERC20Events::Approval {1232				owner: *from.as_eth(),1233				spender: *sender.as_eth(),1234				value: allowance.into(),1235			})?;1236		}12371238		Ok(())1239	}12401241	pub fn set_variable_meta_data_internal(1242		sender: &T::CrossAccountId,1243		collection: &CollectionHandle<T>,1244		item_id: TokenId,1245		data: Vec<u8>,1246	) -> DispatchResult {1247		Self::token_exists(collection, item_id)?;12481249		ensure!(1250			CUSTOM_DATA_LIMIT >= data.len() as u32,1251			Error::<T>::TokenVariableDataLimitExceeded1252		);12531254		ensure!(1255			(Self::is_item_owner(sender, collection, item_id)?1256				&& collection.meta_update_permission == MetaUpdatePermission::ItemOwner)1257				|| (Self::is_owner_or_admin_permissions(collection, sender)?1258					&& collection.meta_update_permission == MetaUpdatePermission::Admin),1259			Error::<T>::NoPermission1260		);12611262		match collection.mode {1263			CollectionMode::NFT => Self::set_nft_variable_data(collection, item_id, data)?,1264			CollectionMode::ReFungible => {1265				Self::set_re_fungible_variable_data(collection, item_id, data)?1266			}1267			CollectionMode::Fungible(_) => fail!(Error::<T>::CantStoreMetadataInFungibleTokens),1268		};12691270		Ok(())1271	}12721273	pub fn meta_update_check(1274		sender: &T::CrossAccountId,1275		collection: &CollectionHandle<T>,1276		item_id: TokenId,1277	) -> DispatchResult {1278		match collection.meta_update_permission {1279			MetaUpdatePermission::ItemOwner => ensure!(1280				Self::is_item_owner(sender, collection, item_id)?,1281				Error::<T>::NoPermission1282			),1283			MetaUpdatePermission::Admin => ensure!(1284				Self::is_owner_or_admin_permissions(collection, sender)?,1285				Error::<T>::NoPermission1286			),1287			MetaUpdatePermission::None => fail!(Error::<T>::MetadataUpdateDenied),1288		}12891290		Ok(())1291	}12921293	pub fn get_variable_metadata(1294		collection: &CollectionHandle<T>,1295		item_id: TokenId,1296	) -> Result<Vec<u8>, DispatchError> {1297		Ok(match collection.mode {1298			CollectionMode::NFT => {1299				<NftItemList<T>>::get(collection.id, item_id)1300					.ok_or(Error::<T>::TokenNotFound)?1301					.variable_data1302			}1303			CollectionMode::ReFungible => {1304				<ReFungibleItemList<T>>::get(collection.id, item_id)1305					.ok_or(Error::<T>::TokenNotFound)?1306					.variable_data1307			}1308			_ => fail!(Error::<T>::UnexpectedCollectionType),1309		})1310	}13111312	pub fn create_multiple_items_internal(1313		sender: &T::CrossAccountId,1314		collection: &CollectionHandle<T>,1315		owner: &T::CrossAccountId,1316		items_data: Vec<CreateItemData>,1317	) -> DispatchResult {1318		Self::can_create_items_in_collection(collection, sender, owner, items_data.len() as u32)?;13191320		for data in &items_data {1321			Self::validate_create_item_args(collection, data)?;1322		}1323		for data in &items_data {1324			Self::create_item_no_validation(collection, owner, data.clone())?;1325		}13261327		Ok(())1328	}13291330	pub fn burn_item_internal(1331		sender: &T::CrossAccountId,1332		collection: &CollectionHandle<T>,1333		item_id: TokenId,1334		value: u128,1335	) -> DispatchResult {1336		ensure!(1337			Self::is_item_owner(sender, collection, item_id)?1338				|| (collection.limits.owner_can_transfer1339					&& Self::is_owner_or_admin_permissions(collection, sender)?),1340			Error::<T>::NoPermission1341		);13421343		if collection.access == AccessMode::WhiteList {1344			Self::check_white_list(collection, sender)?;1345		}13461347		match collection.mode {1348			CollectionMode::NFT => Self::burn_nft_item(collection, item_id)?,1349			CollectionMode::Fungible(_) => Self::burn_fungible_item(sender, collection, value)?,1350			CollectionMode::ReFungible => Self::burn_refungible_item(collection, item_id, sender)?,1351		};13521353		Ok(())1354	}13551356	pub fn toggle_white_list_internal(1357		sender: &T::CrossAccountId,1358		collection: &CollectionHandle<T>,1359		address: &T::CrossAccountId,1360		whitelisted: bool,1361	) -> DispatchResult {1362		Self::check_owner_or_admin_permissions(collection, sender)?;13631364		if whitelisted {1365			<WhiteList<T>>::insert(collection.id, address.as_sub(), true);1366		} else {1367			<WhiteList<T>>::remove(collection.id, address.as_sub());1368		}13691370		Ok(())1371	}13721373	fn is_correct_transfer(1374		collection: &CollectionHandle<T>,1375		recipient: &T::CrossAccountId,1376	) -> DispatchResult {1377		let collection_id = collection.id;13781379		// check token limit and account token limit1380		collection.consume_sload()?;1381		let account_items: u32 =1382			<AddressTokens<T>>::get(collection_id, recipient.as_sub()).len() as u32;13831384		// zero limit means collection limit is disabled1385		// otherwise get lower value1386		let limit = if collection.limits.account_token_ownership_limit == 01387			|| collection.limits.account_token_ownership_limit > ACCOUNT_TOKEN_OWNERSHIP_LIMIT1388		{1389			ACCOUNT_TOKEN_OWNERSHIP_LIMIT1390		} else {1391			collection.limits.account_token_ownership_limit1392		};13931394		ensure!(limit > account_items, Error::<T>::AccountTokenLimitExceeded);13951396		// preliminary transfer check1397		ensure!(collection.transfers_enabled, Error::<T>::TransferNotAllowed);13981399		Ok(())1400	}14011402	fn can_create_items_in_collection(1403		collection: &CollectionHandle<T>,1404		sender: &T::CrossAccountId,1405		owner: &T::CrossAccountId,1406		amount: u32,1407	) -> DispatchResult {1408		let collection_id = collection.id;14091410		// check token limit and account token limit1411		let total_items: u32 = ItemListIndex::get(collection_id)1412			.checked_add(amount)1413			.ok_or(Error::<T>::CollectionTokenLimitExceeded)?;1414		let account_items: u32 = (<AddressTokens<T>>::get(collection_id, owner.as_sub()).len()1415			as u32)1416			.checked_add(amount)1417			.ok_or(Error::<T>::AccountTokenLimitExceeded)?;14181419		// zero limit means collection limit is disabled1420		// otherwise get lower value1421		let account_token_limit = if collection.limits.account_token_ownership_limit == 01422			|| collection.limits.account_token_ownership_limit > ACCOUNT_TOKEN_OWNERSHIP_LIMIT1423		{1424			ACCOUNT_TOKEN_OWNERSHIP_LIMIT1425		} else {1426			collection.limits.account_token_ownership_limit1427		};14281429		ensure!(1430			collection.limits.token_limit >= total_items,1431			Error::<T>::CollectionTokenLimitExceeded1432		);1433		ensure!(1434			account_token_limit >= account_items,1435			Error::<T>::AccountTokenLimitExceeded1436		);14371438		if !Self::is_owner_or_admin_permissions(collection, sender)? {1439			ensure!(collection.mint_mode, Error::<T>::PublicMintingNotAllowed);1440			Self::check_white_list(collection, owner)?;1441			Self::check_white_list(collection, sender)?;1442		}14431444		Ok(())1445	}14461447	fn validate_create_item_args(1448		target_collection: &CollectionHandle<T>,1449		data: &CreateItemData,1450	) -> DispatchResult {1451		match target_collection.mode {1452			CollectionMode::NFT => {1453				if !matches!(data, CreateItemData::NFT(_)) {1454					fail!(Error::<T>::NotNftDataUsedToMintNftCollectionToken);1455				}1456			}1457			CollectionMode::Fungible(_) => {1458				if !matches!(data, CreateItemData::Fungible(_)) {1459					fail!(Error::<T>::NotFungibleDataUsedToMintFungibleCollectionToken);1460				}1461			}1462			CollectionMode::ReFungible => {1463				if let CreateItemData::ReFungible(data) = data {1464					// Check refungibility limits1465					ensure!(1466						data.pieces <= MAX_REFUNGIBLE_PIECES,1467						Error::<T>::WrongRefungiblePieces1468					);1469					ensure!(data.pieces > 0, Error::<T>::WrongRefungiblePieces);1470				} else {1471					fail!(Error::<T>::NotReFungibleDataUsedToMintReFungibleCollectionToken);1472				}1473			}1474		};14751476		Ok(())1477	}14781479	fn create_item_no_validation(1480		collection: &CollectionHandle<T>,1481		owner: &T::CrossAccountId,1482		data: CreateItemData,1483	) -> DispatchResult {1484		match data {1485			CreateItemData::NFT(data) => {1486				let item = NftItemType {1487					owner: owner.clone(),1488					const_data: data.const_data.into_inner(),1489					variable_data: data.variable_data.into_inner(),1490				};14911492				Self::add_nft_item(collection, item)?;1493			}1494			CreateItemData::Fungible(data) => {1495				Self::add_fungible_item(collection, owner, data.value)?;1496			}1497			CreateItemData::ReFungible(data) => {1498				let owner_list = vec![Ownership {1499					owner: owner.clone(),1500					fraction: data.pieces,1501				}];15021503				let item = ReFungibleItemType {1504					owner: owner_list,1505					const_data: data.const_data.into_inner(),1506					variable_data: data.variable_data.into_inner(),1507				};15081509				Self::add_refungible_item(collection, item)?;1510			}1511		};15121513		Ok(())1514	}15151516	fn add_fungible_item(1517		collection: &CollectionHandle<T>,1518		owner: &T::CrossAccountId,1519		value: u128,1520	) -> DispatchResult {1521		let collection_id = collection.id;15221523		// Does new owner already have an account?1524		collection.consume_sload()?;1525		let balance: u128 = <FungibleItemList<T>>::get(collection_id, owner.as_sub()).value;15261527		// Mint1528		let item = FungibleItemType {1529			value: balance.checked_add(value).ok_or(Error::<T>::NumOverflow)?,1530		};1531		collection.consume_sstore()?;1532		<FungibleItemList<T>>::insert(collection_id, owner.as_sub(), item);15331534		// Update balance1535		collection.consume_sload()?;1536		let new_balance = <Balance<T>>::get(collection_id, owner.as_sub())1537			.checked_add(value)1538			.ok_or(Error::<T>::NumOverflow)?;1539		collection.consume_sstore()?;1540		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);15411542		collection.log(ERC20Events::Transfer {1543			from: H160::default(),1544			to: *owner.as_eth(),1545			value: value.into(),1546		})?;1547		Self::deposit_event(RawEvent::ItemCreated(collection_id, 0, owner.clone()));1548		Ok(())1549	}15501551	fn add_refungible_item(1552		collection: &CollectionHandle<T>,1553		item: ReFungibleItemType<T::CrossAccountId>,1554	) -> DispatchResult {1555		let collection_id = collection.id;15561557		let current_index = <ItemListIndex>::get(collection_id)1558			.checked_add(1)1559			.ok_or(Error::<T>::NumOverflow)?;1560		let itemcopy = item.clone();15611562		ensure!(item.owner.len() == 1, Error::<T>::BadCreateRefungibleCall,);1563		let item_owner = item.owner.first().expect("only one owner is defined");15641565		let value = item_owner.fraction;1566		let owner = item_owner.owner.clone();15671568		Self::add_token_index(collection, current_index, &owner)?;15691570		<ItemListIndex>::insert(collection_id, current_index);1571		<ReFungibleItemList<T>>::insert(collection_id, current_index, itemcopy);15721573		// Update balance1574		let new_balance = <Balance<T>>::get(collection_id, owner.as_sub())1575			.checked_add(value)1576			.ok_or(Error::<T>::NumOverflow)?;1577		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);15781579		Self::deposit_event(RawEvent::ItemCreated(collection_id, current_index, owner));1580		Ok(())1581	}15821583	fn add_nft_item(1584		collection: &CollectionHandle<T>,1585		item: NftItemType<T::CrossAccountId>,1586	) -> DispatchResult {1587		let collection_id = collection.id;15881589		let current_index = <ItemListIndex>::get(collection_id)1590			.checked_add(1)1591			.ok_or(Error::<T>::NumOverflow)?;15921593		let item_owner = item.owner.clone();1594		Self::add_token_index(collection, current_index, &item.owner)?;15951596		<ItemListIndex>::insert(collection_id, current_index);1597		<NftItemList<T>>::insert(collection_id, current_index, item);15981599		// Update balance1600		let new_balance = <Balance<T>>::get(collection_id, item_owner.as_sub())1601			.checked_add(1)1602			.ok_or(Error::<T>::NumOverflow)?;1603		<Balance<T>>::insert(collection_id, item_owner.as_sub(), new_balance);16041605		collection.log(ERC721Events::Transfer {1606			from: H160::default(),1607			to: *item_owner.as_eth(),1608			token_id: current_index.into(),1609		})?;1610		Self::deposit_event(RawEvent::ItemCreated(1611			collection_id,1612			current_index,1613			item_owner,1614		));1615		Ok(())1616	}16171618	fn burn_refungible_item(1619		collection: &CollectionHandle<T>,1620		item_id: TokenId,1621		owner: &T::CrossAccountId,1622	) -> DispatchResult {1623		let collection_id = collection.id;16241625		let mut token = <ReFungibleItemList<T>>::get(collection_id, item_id)1626			.ok_or(Error::<T>::TokenNotFound)?;1627		let rft_balance = token1628			.owner1629			.iter()1630			.find(|&i| i.owner == *owner)1631			.ok_or(Error::<T>::TokenNotFound)?;1632		Self::remove_token_index(collection, item_id, owner)?;16331634		// update balance1635		let new_balance = <Balance<T>>::get(collection_id, rft_balance.owner.as_sub())1636			.checked_sub(rft_balance.fraction)1637			.ok_or(Error::<T>::NumOverflow)?;1638		<Balance<T>>::insert(collection_id, rft_balance.owner.as_sub(), new_balance);16391640		// Re-create owners list with sender removed1641		let index = token1642			.owner1643			.iter()1644			.position(|i| i.owner == *owner)1645			.expect("owned item is exists");1646		token.owner.remove(index);1647		let owner_count = token.owner.len();16481649		// Burn the token completely if this was the last (only) owner1650		if owner_count == 0 {1651			<ReFungibleItemList<T>>::remove(collection_id, item_id);1652			<VariableMetaDataBasket<T>>::remove(collection_id, item_id);1653		} else {1654			<ReFungibleItemList<T>>::insert(collection_id, item_id, token);1655		}16561657		Ok(())1658	}16591660	fn burn_nft_item(collection: &CollectionHandle<T>, item_id: TokenId) -> DispatchResult {1661		let collection_id = collection.id;16621663		let item =1664			<NftItemList<T>>::get(collection_id, item_id).ok_or(Error::<T>::TokenNotFound)?;1665		Self::remove_token_index(collection, item_id, &item.owner)?;16661667		// update balance1668		let new_balance = <Balance<T>>::get(collection_id, item.owner.as_sub())1669			.checked_sub(1)1670			.ok_or(Error::<T>::NumOverflow)?;1671		<Balance<T>>::insert(collection_id, item.owner.as_sub(), new_balance);1672		<NftItemList<T>>::remove(collection_id, item_id);1673		<VariableMetaDataBasket<T>>::remove(collection_id, item_id);16741675		collection.log(ERC721Events::Transfer {1676			from: *item.owner.as_eth(),1677			to: H160::default(),1678			token_id: item_id.into(),1679		})?;1680		Self::deposit_event(RawEvent::ItemDestroyed(collection.id, item_id));1681		Ok(())1682	}16831684	fn burn_fungible_item(1685		owner: &T::CrossAccountId,1686		collection: &CollectionHandle<T>,1687		value: u128,1688	) -> DispatchResult {1689		let collection_id = collection.id;16901691		let mut balance = <FungibleItemList<T>>::get(collection_id, owner.as_sub());1692		ensure!(balance.value >= value, Error::<T>::TokenValueNotEnough);16931694		// update balance1695		let new_balance = <Balance<T>>::get(collection_id, owner.as_sub())1696			.checked_sub(value)1697			.ok_or(Error::<T>::NumOverflow)?;1698		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);16991700		if balance.value - value > 0 {1701			balance.value -= value;1702			<FungibleItemList<T>>::insert(collection_id, owner.as_sub(), balance);1703		} else {1704			<FungibleItemList<T>>::remove(collection_id, owner.as_sub());1705		}17061707		collection.log(ERC20Events::Transfer {1708			from: *owner.as_eth(),1709			to: H160::default(),1710			value: value.into(),1711		})?;1712		Ok(())1713	}17141715	pub fn get_collection(1716		collection_id: CollectionId,1717	) -> Result<CollectionHandle<T>, sp_runtime::DispatchError> {1718		Ok(<CollectionHandle<T>>::get(collection_id).ok_or(Error::<T>::CollectionNotFound)?)1719	}17201721	fn check_owner_permissions(1722		target_collection: &CollectionHandle<T>,1723		subject: &T::AccountId,1724	) -> DispatchResult {1725		ensure!(1726			*subject == target_collection.owner,1727			Error::<T>::NoPermission1728		);17291730		Ok(())1731	}17321733	fn is_owner_or_admin_permissions(1734		collection: &CollectionHandle<T>,1735		subject: &T::CrossAccountId,1736	) -> Result<bool, DispatchError> {1737		collection.consume_sload()?;1738		Ok(*subject.as_sub() == collection.owner1739			|| <AdminList<T>>::get(collection.id).contains(subject))1740	}17411742	fn check_owner_or_admin_permissions(1743		collection: &CollectionHandle<T>,1744		subject: &T::CrossAccountId,1745	) -> DispatchResult {1746		ensure!(1747			Self::is_owner_or_admin_permissions(collection, subject)?,1748			Error::<T>::NoPermission1749		);17501751		Ok(())1752	}17531754	fn owned_amount(1755		subject: &T::CrossAccountId,1756		collection: &CollectionHandle<T>,1757		item_id: TokenId,1758	) -> Result<Option<u128>, DispatchError> {1759		collection.consume_sload()?;1760		Ok(Self::owned_amount_unchecked(subject, collection, item_id))1761	}17621763	fn owned_amount_unchecked(1764		subject: &T::CrossAccountId,1765		target_collection: &CollectionHandle<T>,1766		item_id: TokenId,1767	) -> Option<u128> {1768		let collection_id = target_collection.id;17691770		match target_collection.mode {1771			CollectionMode::NFT => {1772				(<NftItemList<T>>::get(collection_id, item_id)?.owner == *subject).then(|| 1)1773			}1774			CollectionMode::Fungible(_) => {1775				Some(<FungibleItemList<T>>::get(collection_id, &subject.as_sub()).value)1776			}1777			CollectionMode::ReFungible => <ReFungibleItemList<T>>::get(collection_id, item_id)?1778				.owner1779				.iter()1780				.find(|i| i.owner == *subject)1781				.map(|i| i.fraction),1782		}1783	}17841785	fn is_item_owner(1786		subject: &T::CrossAccountId,1787		target_collection: &CollectionHandle<T>,1788		item_id: TokenId,1789	) -> Result<bool, DispatchError> {1790		Ok(match target_collection.mode {1791			CollectionMode::Fungible(_) => true,1792			_ => Self::owned_amount(subject, target_collection, item_id)?.is_some(),1793		})1794	}17951796	fn check_white_list(1797		collection: &CollectionHandle<T>,1798		address: &T::CrossAccountId,1799	) -> DispatchResult {1800		collection.consume_sload()?;1801		ensure!(1802			<WhiteList<T>>::contains_key(collection.id, address.as_sub()),1803			Error::<T>::AddresNotInWhiteList,1804		);1805		Ok(())1806	}18071808	/// Check if token exists. In case of Fungible, check if there is an entry for1809	/// the owner in fungible balances double map1810	fn token_exists(target_collection: &CollectionHandle<T>, item_id: TokenId) -> DispatchResult {1811		let collection_id = target_collection.id;1812		let exists = match target_collection.mode {1813			CollectionMode::NFT => <NftItemList<T>>::contains_key(collection_id, item_id),1814			CollectionMode::Fungible(_) => true,1815			CollectionMode::ReFungible => {1816				<ReFungibleItemList<T>>::contains_key(collection_id, item_id)1817			}1818		};18191820		ensure!(exists, Error::<T>::TokenNotFound);1821		Ok(())1822	}18231824	fn transfer_fungible(1825		collection: &CollectionHandle<T>,1826		value: u128,1827		owner: &T::CrossAccountId,1828		recipient: &T::CrossAccountId,1829	) -> DispatchResult {1830		let collection_id = collection.id;18311832		collection.consume_sload()?;1833		collection.consume_sload()?;1834		let mut recipient_balance = <FungibleItemList<T>>::get(collection_id, recipient.as_sub());1835		let mut balance = <FungibleItemList<T>>::get(collection_id, owner.as_sub());18361837		recipient_balance.value = recipient_balance1838			.value1839			.checked_add(value)1840			.ok_or(Error::<T>::NumOverflow)?;1841		balance.value = balance1842			.value1843			.checked_sub(value)1844			.ok_or(Error::<T>::TokenValueTooLow)?;18451846		// update balanceOf1847		collection.consume_sstore()?;1848		collection.consume_sstore()?;1849		if balance.value != 0 {1850			<Balance<T>>::insert(collection_id, owner.as_sub(), balance.value);1851		} else {1852			<Balance<T>>::remove(collection_id, owner.as_sub());1853		}1854		<Balance<T>>::insert(collection_id, recipient.as_sub(), recipient_balance.value);18551856		// Reduce or remove sender1857		collection.consume_sstore()?;1858		collection.consume_sstore()?;1859		if balance.value != 0 {1860			<FungibleItemList<T>>::insert(collection_id, owner.as_sub(), balance);1861		} else {1862			<FungibleItemList<T>>::remove(collection_id, owner.as_sub());1863		}1864		<FungibleItemList<T>>::insert(collection_id, recipient.as_sub(), recipient_balance);18651866		collection.log(ERC20Events::Transfer {1867			from: *owner.as_eth(),1868			to: *recipient.as_eth(),1869			value: value.into(),1870		})?;1871		Self::deposit_event(RawEvent::Transfer(1872			collection.id,1873			1,1874			owner.clone(),1875			recipient.clone(),1876			value,1877		));18781879		Ok(())1880	}18811882	fn transfer_refungible(1883		collection: &CollectionHandle<T>,1884		item_id: TokenId,1885		value: u128,1886		owner: T::CrossAccountId,1887		new_owner: T::CrossAccountId,1888	) -> DispatchResult {1889		let collection_id = collection.id;1890		collection.consume_sload()?;1891		let full_item = <ReFungibleItemList<T>>::get(collection_id, item_id)1892			.ok_or(Error::<T>::TokenNotFound)?;18931894		let item = full_item1895			.owner1896			.iter()1897			.find(|i| i.owner == owner)1898			.ok_or(Error::<T>::TokenNotFound)?;1899		let amount = item.fraction;19001901		ensure!(amount >= value, Error::<T>::TokenValueTooLow);19021903		collection.consume_sload()?;1904		// update balance1905		let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.as_sub())1906			.checked_sub(value)1907			.ok_or(Error::<T>::NumOverflow)?;1908		collection.consume_sstore()?;1909		<Balance<T>>::insert(collection_id, item.owner.as_sub(), balance_old_owner);19101911		collection.consume_sload()?;1912		let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.as_sub())1913			.checked_add(value)1914			.ok_or(Error::<T>::NumOverflow)?;1915		collection.consume_sstore()?;1916		<Balance<T>>::insert(collection_id, new_owner.as_sub(), balance_new_owner);19171918		let old_owner = item.owner.clone();1919		let new_owner_has_account = full_item.owner.iter().any(|i| i.owner == new_owner);19201921		let mut new_full_item = full_item.clone();1922		// transfer1923		if amount == value && !new_owner_has_account {1924			// change owner1925			// new owner do not have account1926			new_full_item1927				.owner1928				.iter_mut()1929				.find(|i| i.owner == owner)1930				.expect("old owner does present in refungible")1931				.owner = new_owner.clone();1932			collection.consume_sstore()?;1933			<ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);19341935			// update index collection1936			Self::move_token_index(collection, item_id, &old_owner, &new_owner)?;1937		} else {1938			new_full_item1939				.owner1940				.iter_mut()1941				.find(|i| i.owner == owner)1942				.expect("old owner does present in refungible")1943				.fraction -= value;19441945			// separate amount1946			if new_owner_has_account {1947				// new owner has account1948				new_full_item1949					.owner1950					.iter_mut()1951					.find(|i| i.owner == new_owner)1952					.expect("new owner has account")1953					.fraction += value;1954			} else {1955				// new owner do not have account1956				new_full_item.owner.push(Ownership {1957					owner: new_owner.clone(),1958					fraction: value,1959				});1960				Self::add_token_index(collection, item_id, &new_owner)?;1961			}19621963			collection.consume_sstore()?;1964			<ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);1965		}19661967		Self::deposit_event(RawEvent::Transfer(1968			collection.id,1969			item_id,1970			owner,1971			new_owner,1972			amount,1973		));19741975		Ok(())1976	}19771978	fn transfer_nft(1979		collection: &CollectionHandle<T>,1980		item_id: TokenId,1981		sender: T::CrossAccountId,1982		new_owner: T::CrossAccountId,1983	) -> DispatchResult {1984		let collection_id = collection.id;1985		collection.consume_sload()?;1986		let mut item =1987			<NftItemList<T>>::get(collection_id, item_id).ok_or(Error::<T>::TokenNotFound)?;19881989		ensure!(sender == item.owner, Error::<T>::MustBeTokenOwner);19901991		collection.consume_sload()?;1992		// update balance1993		let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.as_sub())1994			.checked_sub(1)1995			.ok_or(Error::<T>::NumOverflow)?;1996		collection.consume_sstore()?;1997		<Balance<T>>::insert(collection_id, item.owner.as_sub(), balance_old_owner);19981999		collection.consume_sload()?;2000		let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.as_sub())2001			.checked_add(1)2002			.ok_or(Error::<T>::NumOverflow)?;2003		collection.consume_sstore()?;2004		<Balance<T>>::insert(collection_id, new_owner.as_sub(), balance_new_owner);20052006		// change owner2007		let old_owner = item.owner.clone();2008		item.owner = new_owner.clone();2009		collection.consume_sstore()?;2010		<NftItemList<T>>::insert(collection_id, item_id, item);20112012		// update index collection2013		Self::move_token_index(collection, item_id, &old_owner, &new_owner)?;20142015		collection.log(ERC721Events::Transfer {2016			from: *sender.as_eth(),2017			to: *new_owner.as_eth(),2018			token_id: item_id.into(),2019		})?;2020		Self::deposit_event(RawEvent::Transfer(2021			collection.id,2022			item_id,2023			sender,2024			new_owner,2025			1,2026		));20272028		Ok(())2029	}20302031	fn set_re_fungible_variable_data(2032		collection: &CollectionHandle<T>,2033		item_id: TokenId,2034		data: Vec<u8>,2035	) -> DispatchResult {2036		let collection_id = collection.id;2037		let mut item = <ReFungibleItemList<T>>::get(collection_id, item_id)2038			.ok_or(Error::<T>::TokenNotFound)?;20392040		item.variable_data = data;20412042		<ReFungibleItemList<T>>::insert(collection_id, item_id, item);20432044		Ok(())2045	}20462047	fn set_nft_variable_data(2048		collection: &CollectionHandle<T>,2049		item_id: TokenId,2050		data: Vec<u8>,2051	) -> DispatchResult {2052		let collection_id = collection.id;2053		let mut item =2054			<NftItemList<T>>::get(collection_id, item_id).ok_or(Error::<T>::TokenNotFound)?;20552056		item.variable_data = data;20572058		<NftItemList<T>>::insert(collection_id, item_id, item);20592060		Ok(())2061	}20622063	#[allow(dead_code)]2064	fn init_collection(item: &Collection<T>) {2065		// check params2066		assert!(2067			item.decimal_points <= MAX_DECIMAL_POINTS,2068			"decimal_points parameter must be lower than MAX_DECIMAL_POINTS"2069		);2070		assert!(2071			item.name.len() <= 64,2072			"Collection name can not be longer than 63 char"2073		);2074		assert!(2075			item.name.len() <= 256,2076			"Collection description can not be longer than 255 char"2077		);2078		assert!(2079			item.token_prefix.len() <= 16,2080			"Token prefix can not be longer than 15 char"2081		);20822083		// Generate next collection ID2084		let next_id = CreatedCollectionCount::get().checked_add(1).unwrap();20852086		CreatedCollectionCount::put(next_id);2087	}20882089	#[allow(dead_code)]2090	fn init_nft_token(collection_id: CollectionId, item: &NftItemType<T::CrossAccountId>) {2091		let current_index = <ItemListIndex>::get(collection_id).checked_add(1).unwrap();20922093		Self::add_token_index(2094			&CollectionHandle::get(collection_id).unwrap(),2095			current_index,2096			&item.owner,2097		)2098		.unwrap();20992100		<ItemListIndex>::insert(collection_id, current_index);21012102		// Update balance2103		let new_balance = <Balance<T>>::get(collection_id, item.owner.as_sub())2104			.checked_add(1)2105			.unwrap();2106		<Balance<T>>::insert(collection_id, item.owner.as_sub(), new_balance);2107	}21082109	#[allow(dead_code)]2110	fn init_fungible_token(2111		collection_id: CollectionId,2112		owner: &T::CrossAccountId,2113		item: &FungibleItemType,2114	) {2115		let current_index = <ItemListIndex>::get(collection_id).checked_add(1).unwrap();21162117		Self::add_token_index(2118			&CollectionHandle::get(collection_id).unwrap(),2119			current_index,2120			owner,2121		)2122		.unwrap();21232124		<ItemListIndex>::insert(collection_id, current_index);21252126		// Update balance2127		let new_balance = <Balance<T>>::get(collection_id, owner.as_sub())2128			.checked_add(item.value)2129			.unwrap();2130		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);2131	}21322133	#[allow(dead_code)]2134	fn init_refungible_token(2135		collection_id: CollectionId,2136		item: &ReFungibleItemType<T::CrossAccountId>,2137	) {2138		let current_index = <ItemListIndex>::get(collection_id).checked_add(1).unwrap();21392140		let value = item.owner.first().unwrap().fraction;2141		let owner = item.owner.first().unwrap().owner.clone();21422143		Self::add_token_index(2144			&CollectionHandle::get(collection_id).unwrap(),2145			current_index,2146			&owner,2147		)2148		.unwrap();21492150		<ItemListIndex>::insert(collection_id, current_index);21512152		// Update balance2153		let new_balance = <Balance<T>>::get(collection_id, &owner.as_sub())2154			.checked_add(value)2155			.unwrap();2156		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);2157	}21582159	fn add_token_index(2160		collection: &CollectionHandle<T>,2161		item_index: TokenId,2162		owner: &T::CrossAccountId,2163	) -> DispatchResult {2164		collection.consume_sload()?;2165		let list_exists = <AddressTokens<T>>::contains_key(collection.id, owner.as_sub());2166		if list_exists {2167			collection.consume_sload()?;2168			let mut list = <AddressTokens<T>>::get(collection.id, owner.as_sub());21692170			// bound Owned tokens by a single address in collection2171			let account_items: u32 = list.len() as u32;2172			ensure!(2173				account_items < ACCOUNT_TOKEN_OWNERSHIP_LIMIT,2174				Error::<T>::AddressOwnershipLimitExceeded2175			);21762177			let item_contains = list.contains(&item_index.clone());21782179			if !item_contains {2180				list.push(item_index);2181			}21822183			collection.consume_sstore()?;2184			<AddressTokens<T>>::insert(collection.id, owner.as_sub(), list);2185		} else {2186			let itm = vec![item_index];2187			collection.consume_sstore()?;2188			<AddressTokens<T>>::insert(collection.id, owner.as_sub(), itm);2189		}21902191		Ok(())2192	}21932194	fn remove_token_index(2195		collection: &CollectionHandle<T>,2196		item_index: TokenId,2197		owner: &T::CrossAccountId,2198	) -> DispatchResult {2199		collection.consume_sload()?;2200		let list_exists = <AddressTokens<T>>::contains_key(collection.id, owner.as_sub());2201		if list_exists {2202			collection.consume_sload()?;2203			let mut list = <AddressTokens<T>>::get(collection.id, owner.as_sub());2204			let item_contains = list.contains(&item_index.clone());22052206			if item_contains {2207				list.retain(|&item| item != item_index);2208				collection.consume_sstore()?;2209				<AddressTokens<T>>::insert(collection.id, owner.as_sub(), list);2210			}2211		}22122213		Ok(())2214	}22152216	fn move_token_index(2217		collection: &CollectionHandle<T>,2218		item_index: TokenId,2219		old_owner: &T::CrossAccountId,2220		new_owner: &T::CrossAccountId,2221	) -> DispatchResult {2222		Self::remove_token_index(collection, item_index, old_owner)?;2223		Self::add_token_index(collection, item_index, new_owner)?;22242225		Ok(())2226	}2227}22282229sp_api::decl_runtime_apis! {2230	pub trait NftApi {2231		/// Used for ethereum integration2232		fn eth_contract_code(account: H160) -> Option<Vec<u8>>;2233	}2234}