git.delta.rocks / unique-network / refs/commits / 23e7e864f113

difftreelog

Merge pull request #337 from UniqueNetwork/CORE-178

kozyrevdev2022-04-21parents: #41b4396 #ac711ec.patch.diff
in: master
feature/core-178

9 files changed

modifiedclient/rpc/src/lib.rsdiffbeforeafterboth
--- a/client/rpc/src/lib.rs
+++ b/client/rpc/src/lib.rs
@@ -119,6 +119,15 @@
 	) -> Result<Option<Collection<AccountId>>>;
 	#[rpc(name = "unique_collectionStats")]
 	fn collection_stats(&self, at: Option<BlockHash>) -> Result<CollectionStats>;
+
+	#[rpc(name = "unique_nextSponsored")]
+	fn next_sponsored(
+		&self,
+		collection: CollectionId,
+		account: CrossAccountId,
+		token: TokenId,
+		at: Option<BlockHash>,
+	) -> Result<Option<u64>>;
 	#[rpc(name = "unique_effectiveCollectionLimits")]
 	fn effective_collection_limits(
 		&self,
@@ -228,5 +237,6 @@
 	pass_method!(last_token_id(collection: CollectionId) -> TokenId);
 	pass_method!(collection_by_id(collection: CollectionId) -> Option<Collection<AccountId>>);
 	pass_method!(collection_stats() -> CollectionStats);
+	pass_method!(next_sponsored(collection: CollectionId, account: CrossAccountId, token: TokenId) -> Option<u64>);
 	pass_method!(effective_collection_limits(collection_id: CollectionId) -> Option<CollectionLimits>);
 }
modifiedpallets/unique/src/lib.rsdiffbeforeafterboth
--- a/pallets/unique/src/lib.rs
+++ b/pallets/unique/src/lib.rs
@@ -67,7 +67,7 @@
 
 mod eth;
 mod sponsorship;
-pub use sponsorship::UniqueSponsorshipHandler;
+pub use sponsorship::{UniqueSponsorshipHandler, UniqueSponsorshipPredict};
 pub use eth::sponsoring::UniqueEthSponsorshipHandler;
 
 pub use eth::UniqueErcSupport;
@@ -82,6 +82,12 @@
 pub mod weights;
 use weights::WeightInfo;
 
+pub trait SponsorshipPredict<T: Config> {
+	fn predict(collection: CollectionId, account: T::CrossAccountId, token: TokenId) -> Option<u64>
+	where
+		u64: From<<T as frame_system::Config>::BlockNumber>;
+}
+
 decl_error! {
 	/// Error for non-fungible-token module.
 	pub enum Error for Module<T: Config> {
modifiedpallets/unique/src/sponsorship.rsdiffbeforeafterboth
before · pallets/unique/src/sponsorship.rs
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/>.1617use crate::{18	Config, Call, CreateItemBasket, VariableMetaDataBasket, ReFungibleTransferBasket,19	FungibleTransferBasket, NftTransferBasket, CreateItemData, CollectionMode, NftApproveBasket,20	FungibleApproveBasket, RefungibleApproveBasket,21};22use core::marker::PhantomData;23use up_sponsorship::SponsorshipHandler;24use frame_support::{25	traits::{IsSubType},26	storage::{StorageMap, StorageDoubleMap, StorageNMap},27};28use up_data_structs::{29	CollectionId, FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT, MetaUpdatePermission,30	NFT_SPONSOR_TRANSFER_TIMEOUT, REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT, TokenId,31};32use pallet_common::{CollectionHandle};33use pallet_evm::account::CrossAccountId;3435pub fn withdraw_transfer<T: Config>(36	collection: &CollectionHandle<T>,37	who: &T::CrossAccountId,38	item_id: &TokenId,39) -> Option<()> {40	// preliminary sponsoring correctness check41	match collection.mode {42		CollectionMode::NFT => {43			let owner = pallet_nonfungible::TokenData::<T>::get((collection.id, item_id))?.owner;44			if !owner.conv_eq(who) {45				return None;46			}47		}48		CollectionMode::Fungible(_) => {49			if item_id != &TokenId::default() {50				return None;51			}52			if <pallet_fungible::Balance<T>>::get((collection.id, who)) == 0 {53				return None;54			}55		}56		CollectionMode::ReFungible => {57			if !<pallet_refungible::Owned<T>>::get((collection.id, who, item_id)) {58				return None;59			}60		}61	}6263	// sponsor timeout64	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;65	let limit = collection66		.limits67		.sponsor_transfer_timeout(match collection.mode {68			CollectionMode::NFT => NFT_SPONSOR_TRANSFER_TIMEOUT,69			CollectionMode::Fungible(_) => FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,70			CollectionMode::ReFungible => REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,71		});7273	let last_tx_block = match collection.mode {74		CollectionMode::NFT => <NftTransferBasket<T>>::get(collection.id, item_id),75		CollectionMode::Fungible(_) => {76			<FungibleTransferBasket<T>>::get(collection.id, who.as_sub())77		}78		CollectionMode::ReFungible => {79			<ReFungibleTransferBasket<T>>::get((collection.id, item_id, who.as_sub()))80		}81	};8283	if let Some(last_tx_block) = last_tx_block {84		let timeout = last_tx_block + limit.into();85		if block_number < timeout {86			return None;87		}88	}8990	match collection.mode {91		CollectionMode::NFT => <NftTransferBasket<T>>::insert(collection.id, item_id, block_number),92		CollectionMode::Fungible(_) => {93			<FungibleTransferBasket<T>>::insert(collection.id, who.as_sub(), block_number)94		}95		CollectionMode::ReFungible => <ReFungibleTransferBasket<T>>::insert(96			(collection.id, item_id, who.as_sub()),97			block_number,98		),99	};100101	Some(())102}103104pub fn withdraw_create_item<T: Config>(105	collection: &CollectionHandle<T>,106	who: &T::CrossAccountId,107	_properties: &CreateItemData,108) -> Option<()> {109	if _properties.data_size() as u32 > collection.limits.sponsored_data_size() {110		return None;111	}112113	// sponsor timeout114	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;115	let limit = collection116		.limits117		.sponsor_transfer_timeout(match _properties {118			CreateItemData::NFT(_) => NFT_SPONSOR_TRANSFER_TIMEOUT,119			CreateItemData::Fungible(_) => FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,120			CreateItemData::ReFungible(_) => REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,121		});122123	if let Some(last_tx_block) = <CreateItemBasket<T>>::get((collection.id, who.as_sub())) {124		let timeout = last_tx_block + limit.into();125		if block_number < timeout {126			return None;127		}128	}129130	CreateItemBasket::<T>::insert((collection.id, who.as_sub()), block_number);131132	Some(())133}134135pub fn withdraw_set_variable_meta_data<T: Config>(136	who: &T::CrossAccountId,137	collection: &CollectionHandle<T>,138	item_id: &TokenId,139	data: &[u8],140) -> Option<()> {141	// TODO: make it work for admins142	if collection.meta_update_permission != MetaUpdatePermission::ItemOwner {143		return None;144	}145	// preliminary sponsoring correctness check146	match collection.mode {147		CollectionMode::NFT => {148			let owner = pallet_nonfungible::TokenData::<T>::get((collection.id, item_id))?.owner;149			if !owner.conv_eq(who) {150				return None;151			}152		}153		CollectionMode::Fungible(_) => {154			if item_id != &TokenId::default() {155				return None;156			}157			if <pallet_fungible::Balance<T>>::get((collection.id, who)) == 0 {158				return None;159			}160		}161		CollectionMode::ReFungible => {162			if !<pallet_refungible::Owned<T>>::get((collection.id, who, item_id)) {163				return None;164			}165		}166	}167168	// Can't sponsor fungible collection, this tx will be rejected169	// as invalid170	if matches!(collection.mode, CollectionMode::Fungible(_)) {171		return None;172	}173	if data.len() > collection.limits.sponsored_data_size() as usize {174		return None;175	}176177	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;178	let limit = collection.limits.sponsored_data_rate_limit()?;179180	if let Some(last_tx_block) = VariableMetaDataBasket::<T>::get(collection.id, item_id) {181		let timeout = last_tx_block + limit.into();182		if block_number < timeout {183			return None;184		}185	}186187	<VariableMetaDataBasket<T>>::insert(collection.id, item_id, block_number);188189	Some(())190}191192pub fn withdraw_approve<T: Config>(193	collection: &CollectionHandle<T>,194	who: &T::AccountId,195	item_id: &TokenId,196) -> Option<()> {197	// sponsor timeout198	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;199	let limit = collection.limits.sponsor_approve_timeout();200201	let last_tx_block = match collection.mode {202		CollectionMode::NFT => <NftApproveBasket<T>>::get(collection.id, item_id),203		CollectionMode::Fungible(_) => <FungibleApproveBasket<T>>::get(collection.id, who),204		CollectionMode::ReFungible => {205			<RefungibleApproveBasket<T>>::get((collection.id, item_id, who))206		}207	};208209	if let Some(last_tx_block) = last_tx_block {210		let timeout = last_tx_block + limit.into();211		if block_number < timeout {212			return None;213		}214	}215216	match collection.mode {217		CollectionMode::NFT => <NftApproveBasket<T>>::insert(collection.id, item_id, block_number),218		CollectionMode::Fungible(_) => {219			<FungibleApproveBasket<T>>::insert(collection.id, who, block_number)220		}221		CollectionMode::ReFungible => {222			<RefungibleApproveBasket<T>>::insert((collection.id, item_id, who), block_number)223		}224	};225226	Some(())227}228229fn load<T: Config>(id: CollectionId) -> Option<(T::AccountId, CollectionHandle<T>)> {230	let collection = CollectionHandle::new(id)?;231	let sponsor = collection.sponsorship.sponsor().cloned()?;232	Some((sponsor, collection))233}234235pub struct UniqueSponsorshipHandler<T>(PhantomData<T>);236impl<T, C> SponsorshipHandler<T::AccountId, C> for UniqueSponsorshipHandler<T>237where238	T: Config,239	C: IsSubType<Call<T>>,240{241	fn get_sponsor(who: &T::AccountId, call: &C) -> Option<T::AccountId> {242		match IsSubType::<Call<T>>::is_sub_type(call)? {243			Call::create_item {244				collection_id,245				data,246				..247			} => {248				let (sponsor, collection) = load(*collection_id)?;249				withdraw_create_item::<T>(250					&collection,251					&T::CrossAccountId::from_sub(who.clone()),252					data,253				)254				.map(|()| sponsor)255			}256			Call::transfer {257				collection_id,258				item_id,259				..260			} => {261				let (sponsor, collection) = load(*collection_id)?;262				withdraw_transfer::<T>(263					&collection,264					&T::CrossAccountId::from_sub(who.clone()),265					item_id,266				)267				.map(|()| sponsor)268			}269			Call::transfer_from {270				collection_id,271				item_id,272				from,273				..274			} => {275				let (sponsor, collection) = load(*collection_id)?;276				withdraw_transfer::<T>(&collection, from, item_id).map(|()| sponsor)277			}278			Call::approve {279				collection_id,280				item_id,281				..282			} => {283				let (sponsor, collection) = load(*collection_id)?;284				withdraw_approve::<T>(&collection, who, item_id).map(|()| sponsor)285			}286			Call::set_variable_meta_data {287				collection_id,288				item_id,289				data,290			} => {291				let (sponsor, collection) = load(*collection_id)?;292				withdraw_set_variable_meta_data::<T>(293					&T::CrossAccountId::from_sub(who.clone()),294					&collection,295					item_id,296					data,297				)298				.map(|()| sponsor)299			}300			_ => None,301		}302	}303}
after · pallets/unique/src/sponsorship.rs
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/>.1617use crate::{18	Config, Call, CreateItemBasket, VariableMetaDataBasket, ReFungibleTransferBasket,19	FungibleTransferBasket, NftTransferBasket, CreateItemData, CollectionMode, NftApproveBasket,20	FungibleApproveBasket, RefungibleApproveBasket,21};22use core::marker::PhantomData;23use up_sponsorship::SponsorshipHandler;24use frame_support::{25	traits::{IsSubType},26	storage::{StorageMap, StorageDoubleMap, StorageNMap},27};28use up_data_structs::{29	CollectionId, FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT, MetaUpdatePermission,30	NFT_SPONSOR_TRANSFER_TIMEOUT, REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT, TokenId,31};32use sp_runtime::traits::Saturating;33use pallet_common::{CollectionHandle};34use pallet_evm::account::CrossAccountId;3536pub fn withdraw_transfer<T: Config>(37	collection: &CollectionHandle<T>,38	who: &T::CrossAccountId,39	item_id: &TokenId,40) -> Option<()> {41	// preliminary sponsoring correctness check42	match collection.mode {43		CollectionMode::NFT => {44			let owner = pallet_nonfungible::TokenData::<T>::get((collection.id, item_id))?.owner;45			if !owner.conv_eq(who) {46				return None;47			}48		}49		CollectionMode::Fungible(_) => {50			if item_id != &TokenId::default() {51				return None;52			}53			if <pallet_fungible::Balance<T>>::get((collection.id, who)) == 0 {54				return None;55			}56		}57		CollectionMode::ReFungible => {58			if !<pallet_refungible::Owned<T>>::get((collection.id, who, item_id)) {59				return None;60			}61		}62	}6364	// sponsor timeout65	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;66	let limit = collection67		.limits68		.sponsor_transfer_timeout(match collection.mode {69			CollectionMode::NFT => NFT_SPONSOR_TRANSFER_TIMEOUT,70			CollectionMode::Fungible(_) => FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,71			CollectionMode::ReFungible => REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,72		});7374	let last_tx_block = match collection.mode {75		CollectionMode::NFT => <NftTransferBasket<T>>::get(collection.id, item_id),76		CollectionMode::Fungible(_) => {77			<FungibleTransferBasket<T>>::get(collection.id, who.as_sub())78		}79		CollectionMode::ReFungible => {80			<ReFungibleTransferBasket<T>>::get((collection.id, item_id, who.as_sub()))81		}82	};8384	if let Some(last_tx_block) = last_tx_block {85		let timeout = last_tx_block + limit.into();86		if block_number < timeout {87			return None;88		}89	}9091	match collection.mode {92		CollectionMode::NFT => <NftTransferBasket<T>>::insert(collection.id, item_id, block_number),93		CollectionMode::Fungible(_) => {94			<FungibleTransferBasket<T>>::insert(collection.id, who.as_sub(), block_number)95		}96		CollectionMode::ReFungible => <ReFungibleTransferBasket<T>>::insert(97			(collection.id, item_id, who.as_sub()),98			block_number,99		),100	};101102	Some(())103}104105pub fn withdraw_create_item<T: Config>(106	collection: &CollectionHandle<T>,107	who: &T::CrossAccountId,108	_properties: &CreateItemData,109) -> Option<()> {110	if _properties.data_size() as u32 > collection.limits.sponsored_data_size() {111		return None;112	}113114	// sponsor timeout115	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;116	let limit = collection117		.limits118		.sponsor_transfer_timeout(match _properties {119			CreateItemData::NFT(_) => NFT_SPONSOR_TRANSFER_TIMEOUT,120			CreateItemData::Fungible(_) => FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,121			CreateItemData::ReFungible(_) => REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,122		});123124	if let Some(last_tx_block) = <CreateItemBasket<T>>::get((collection.id, who.as_sub())) {125		let timeout = last_tx_block + limit.into();126		if block_number < timeout {127			return None;128		}129	}130131	CreateItemBasket::<T>::insert((collection.id, who.as_sub()), block_number);132133	Some(())134}135136pub fn withdraw_set_variable_meta_data<T: Config>(137	who: &T::CrossAccountId,138	collection: &CollectionHandle<T>,139	item_id: &TokenId,140	data: &[u8],141) -> Option<()> {142	// TODO: make it work for admins143	if collection.meta_update_permission != MetaUpdatePermission::ItemOwner {144		return None;145	}146	// preliminary sponsoring correctness check147	match collection.mode {148		CollectionMode::NFT => {149			let owner = pallet_nonfungible::TokenData::<T>::get((collection.id, item_id))?.owner;150			if !owner.conv_eq(who) {151				return None;152			}153		}154		CollectionMode::Fungible(_) => {155			if item_id != &TokenId::default() {156				return None;157			}158			if <pallet_fungible::Balance<T>>::get((collection.id, who)) == 0 {159				return None;160			}161		}162		CollectionMode::ReFungible => {163			if !<pallet_refungible::Owned<T>>::get((collection.id, who, item_id)) {164				return None;165			}166		}167	}168169	// Can't sponsor fungible collection, this tx will be rejected170	// as invalid171	if matches!(collection.mode, CollectionMode::Fungible(_)) {172		return None;173	}174	if data.len() > collection.limits.sponsored_data_size() as usize {175		return None;176	}177178	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;179	let limit = collection.limits.sponsored_data_rate_limit()?;180181	if let Some(last_tx_block) = VariableMetaDataBasket::<T>::get(collection.id, item_id) {182		let timeout = last_tx_block + limit.into();183		if block_number < timeout {184			return None;185		}186	}187188	<VariableMetaDataBasket<T>>::insert(collection.id, item_id, block_number);189190	Some(())191}192193pub fn withdraw_approve<T: Config>(194	collection: &CollectionHandle<T>,195	who: &T::AccountId,196	item_id: &TokenId,197) -> Option<()> {198	// sponsor timeout199	let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;200	let limit = collection.limits.sponsor_approve_timeout();201202	let last_tx_block = match collection.mode {203		CollectionMode::NFT => <NftApproveBasket<T>>::get(collection.id, item_id),204		CollectionMode::Fungible(_) => <FungibleApproveBasket<T>>::get(collection.id, who),205		CollectionMode::ReFungible => {206			<RefungibleApproveBasket<T>>::get((collection.id, item_id, who))207		}208	};209210	if let Some(last_tx_block) = last_tx_block {211		let timeout = last_tx_block + limit.into();212		if block_number < timeout {213			return None;214		}215	}216217	match collection.mode {218		CollectionMode::NFT => <NftApproveBasket<T>>::insert(collection.id, item_id, block_number),219		CollectionMode::Fungible(_) => {220			<FungibleApproveBasket<T>>::insert(collection.id, who, block_number)221		}222		CollectionMode::ReFungible => {223			<RefungibleApproveBasket<T>>::insert((collection.id, item_id, who), block_number)224		}225	};226227	Some(())228}229230fn load<T: Config>(id: CollectionId) -> Option<(T::AccountId, CollectionHandle<T>)> {231	let collection = CollectionHandle::new(id)?;232	let sponsor = collection.sponsorship.sponsor().cloned()?;233	Some((sponsor, collection))234}235236pub struct UniqueSponsorshipHandler<T>(PhantomData<T>);237impl<T, C> SponsorshipHandler<T::AccountId, C> for UniqueSponsorshipHandler<T>238where239	T: Config,240	C: IsSubType<Call<T>>,241{242	fn get_sponsor(who: &T::AccountId, call: &C) -> Option<T::AccountId> {243		match IsSubType::<Call<T>>::is_sub_type(call)? {244			Call::create_item {245				collection_id,246				data,247				..248			} => {249				let (sponsor, collection) = load(*collection_id)?;250				withdraw_create_item::<T>(251					&collection,252					&T::CrossAccountId::from_sub(who.clone()),253					data,254				)255				.map(|()| sponsor)256			}257			Call::transfer {258				collection_id,259				item_id,260				..261			} => {262				let (sponsor, collection) = load(*collection_id)?;263				withdraw_transfer::<T>(264					&collection,265					&T::CrossAccountId::from_sub(who.clone()),266					item_id,267				)268				.map(|()| sponsor)269			}270			Call::transfer_from {271				collection_id,272				item_id,273				from,274				..275			} => {276				let (sponsor, collection) = load(*collection_id)?;277				withdraw_transfer::<T>(&collection, from, item_id).map(|()| sponsor)278			}279			Call::approve {280				collection_id,281				item_id,282				..283			} => {284				let (sponsor, collection) = load(*collection_id)?;285				withdraw_approve::<T>(&collection, who, item_id).map(|()| sponsor)286			}287			Call::set_variable_meta_data {288				collection_id,289				item_id,290				data,291			} => {292				let (sponsor, collection) = load(*collection_id)?;293				withdraw_set_variable_meta_data::<T>(294					&T::CrossAccountId::from_sub(who.clone()),295					&collection,296					item_id,297					data,298				)299				.map(|()| sponsor)300			}301			_ => None,302		}303	}304}305306use crate::SponsorshipPredict;307use up_data_structs::SponsorshipState;308pub struct UniqueSponsorshipPredict<T>(PhantomData<T>);309310impl<T> SponsorshipPredict<T> for UniqueSponsorshipPredict<T>311where312	T: Config,313{314	fn predict(collection_id: CollectionId, who: T::CrossAccountId, token: TokenId) -> Option<u64>315	where316		u64: From<<T as frame_system::Config>::BlockNumber>,317	{318		let collection = <CollectionHandle<T>>::try_get(collection_id).ok()?;319		let _ = collection.sponsorship.sponsor()?;320321		// sponsor timeout322		let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;323		let limit = collection324			.limits325			.sponsor_transfer_timeout(match collection.mode {326				CollectionMode::NFT => NFT_SPONSOR_TRANSFER_TIMEOUT,327				CollectionMode::Fungible(_) => FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,328				CollectionMode::ReFungible => REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,329			});330331		let last_tx_block = match collection.mode {332			CollectionMode::NFT => <NftTransferBasket<T>>::get(collection.id, token),333			CollectionMode::Fungible(_) => {334				<FungibleTransferBasket<T>>::get(collection.id, who.as_sub())335			}336			CollectionMode::ReFungible => {337				<ReFungibleTransferBasket<T>>::get((collection.id, token, who.as_sub()))338			}339		};340341		if let Some(last_tx_block) = last_tx_block {342			return Some(343				last_tx_block344					.saturating_add(limit.into())345					.saturating_sub(block_number)346					.into(),347			);348		}349350		let token_exists = match collection.mode {351			CollectionMode::NFT => {352				<pallet_nonfungible::TokenData<T>>::contains_key((collection.id, token))353			}354			CollectionMode::Fungible(_) => true,355			CollectionMode::ReFungible => {356				<pallet_refungible::TotalSupply<T>>::contains_key((collection.id, token))357			}358		};359360		if token_exists {361			Some(0)362		} else {363			None364		}365	}366}
modifiedprimitives/rpc/src/lib.rsdiffbeforeafterboth
--- a/primitives/rpc/src/lib.rs
+++ b/primitives/rpc/src/lib.rs
@@ -59,6 +59,7 @@
 		fn last_token_id(collection: CollectionId) -> Result<TokenId>;
 		fn collection_by_id(collection: CollectionId) -> Result<Option<Collection<AccountId>>>;
 		fn collection_stats() -> Result<CollectionStats>;
+		fn next_sponsored(collection: CollectionId, account: CrossAccountId, token: TokenId) -> Result<Option<u64>>;
 		fn effective_collection_limits(collection_id: CollectionId) -> Result<Option<CollectionLimits>>;
 	}
 }
modifiedruntime/common/src/runtime_apis.rsdiffbeforeafterboth
--- a/runtime/common/src/runtime_apis.rs
+++ b/runtime/common/src/runtime_apis.rs
@@ -69,6 +69,13 @@
                 fn collection_stats() -> Result<CollectionStats, DispatchError> {
                     Ok(<pallet_common::Pallet<Runtime>>::collection_stats())
                 }
+                fn next_sponsored(collection: CollectionId, account: CrossAccountId, token: TokenId) -> Result<Option<u64>, DispatchError> {
+                    Ok(<pallet_unique::UniqueSponsorshipPredict<Runtime> as
+                            pallet_unique::SponsorshipPredict<Runtime>>::predict(
+                        collection,
+                        account,
+                        token))
+                }
 
                 fn effective_collection_limits(collection: CollectionId) -> Result<Option<CollectionLimits>, DispatchError> {
                     Ok(<pallet_common::Pallet<Runtime>>::effective_collection_limits(collection))
modifiedtests/src/interfaces/augment-api-rpc.tsdiffbeforeafterboth
--- a/tests/src/interfaces/augment-api-rpc.ts
+++ b/tests/src/interfaces/augment-api-rpc.ts
@@ -623,6 +623,10 @@
        * Get token variable metadata
        **/
       variableMetadata: AugmentedRpc<(collection: u32 | AnyNumber | Uint8Array, tokenId: u32 | AnyNumber | Uint8Array, at?: Hash | string | Uint8Array) => Observable<Bytes>>;
+      /**
+       * nextSponsored transaction
+       **/
+      nextSponsored: AugmentedRpc<(collection: u32 | AnyNumber | Uint8Array,  account:  AccountId | string | Uint8Array | { Substrate: any } | { Ethereum: any } | string | Uint8Array, tokenId: u32 | AnyNumber | Uint8Array, at?: Hash | string | Uint8Array) => Observable<Option<u64>>>;
     };
     web3: {
       /**
modifiedtests/src/interfaces/unique/definitions.tsdiffbeforeafterboth
--- a/tests/src/interfaces/unique/definitions.ts
+++ b/tests/src/interfaces/unique/definitions.ts
@@ -55,6 +55,7 @@
     collectionById: fun('Get collection by specified id', [collectionParam], 'Option<UpDataStructsCollection>'),
     collectionStats: fun('Get collection stats', [], 'UpDataStructsCollectionStats'),
     allowed: fun('Check if user is allowed to use collection', [collectionParam, crossAccountParam()], 'bool'),
+    nextSponsored: fun('Get number of blocks when sponsored transaction is available', [collectionParam, crossAccountParam(), tokenParam], 'Option<u64>'),
     effectiveCollectionLimits: fun('Get effective collection limits', [collectionParam], 'Option<UpDataStructsCollectionLimits>'),
   },
 };
addedtests/src/nextSponsoring.test.tsdiffbeforeafterboth
--- /dev/null
+++ b/tests/src/nextSponsoring.test.ts
@@ -0,0 +1,110 @@
+// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.
+// This file is part of Unique Network.
+
+// Unique Network is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Unique Network is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
+
+import {ApiPromise} from '@polkadot/api';
+import {IKeyringPair} from '@polkadot/types/types';
+import chai from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import privateKey from './substrate/privateKey';
+import {default as usingApi} from './substrate/substrate-api';
+import {
+  createCollectionExpectSuccess,
+  setCollectionSponsorExpectSuccess,
+  confirmSponsorshipExpectSuccess,
+  createItemExpectSuccess,
+  transferExpectSuccess,
+  normalizeAccountId,
+  getNextSponsored,
+} from './util/helpers';
+
+chai.use(chaiAsPromised);
+const expect = chai.expect;
+
+
+
+describe('Integration Test getNextSponsored(collection_id, owner, item_id):', () => {
+  let alice: IKeyringPair;
+  let bob: IKeyringPair;
+
+  before(async () => {
+    await usingApi(async () => {
+      alice = privateKey('//Alice');
+      bob = privateKey('//Bob');
+    });
+  });
+
+  it('NFT', async () => {
+    await usingApi(async (api: ApiPromise) => {
+
+      // Not existing collection 
+      expect(await getNextSponsored(api, 0, normalizeAccountId(alice), 0)).to.be.equal(-1);
+
+      const collectionId = await createCollectionExpectSuccess();
+      const itemId = await createItemExpectSuccess(alice, collectionId, 'NFT', alice.address);
+
+      // Check with Disabled sponsoring state
+      expect(await getNextSponsored(api, collectionId, normalizeAccountId(alice), itemId)).to.be.equal(-1);
+      await setCollectionSponsorExpectSuccess(collectionId, bob.address);
+
+      // Check with Unconfirmed sponsoring state
+      expect(await getNextSponsored(api, collectionId, normalizeAccountId(alice), itemId)).to.be.equal(-1);
+      await confirmSponsorshipExpectSuccess(collectionId, '//Bob');
+
+      // Check with Confirmed sponsoring state
+      expect(await getNextSponsored(api, collectionId, normalizeAccountId(alice), itemId)).to.be.equal(0);
+
+      // After transfer
+      await transferExpectSuccess(collectionId, itemId, alice, bob, 1);
+      expect(await getNextSponsored(api, collectionId, normalizeAccountId(alice), itemId)).to.be.equal(5);
+
+      // Not existing token 
+      expect(await getNextSponsored(api, collectionId, normalizeAccountId(alice), itemId+1)).to.be.equal(-1);
+    });
+  });
+
+  it('Fungible', async () => {
+    await usingApi(async (api: ApiPromise) => {
+
+      const createMode = 'Fungible';
+      const funCollectionId = await createCollectionExpectSuccess({mode: {type: createMode, decimalPoints: 0}});
+      await createItemExpectSuccess(alice, funCollectionId, createMode);
+      await setCollectionSponsorExpectSuccess(funCollectionId, bob.address);
+      await confirmSponsorshipExpectSuccess(funCollectionId, '//Bob');
+      expect(await getNextSponsored(api, funCollectionId, normalizeAccountId(alice), 0)).to.be.equal(0);
+
+      await transferExpectSuccess(funCollectionId, 0, alice, bob, 10, 'Fungible');
+      expect(await getNextSponsored(api, funCollectionId, normalizeAccountId(alice), 0)).to.be.equal(5);
+    });
+  });
+
+  it('ReFungible', async () => {
+    await usingApi(async (api: ApiPromise) => {
+
+      const createMode = 'ReFungible';
+      const refunCollectionId = await createCollectionExpectSuccess({mode: {type: createMode}});
+      const refunItemId = await createItemExpectSuccess(alice, refunCollectionId, createMode);
+      await setCollectionSponsorExpectSuccess(refunCollectionId, bob.address);
+      await confirmSponsorshipExpectSuccess(refunCollectionId, '//Bob');
+      expect(await getNextSponsored(api, refunCollectionId, normalizeAccountId(alice), refunItemId)).to.be.equal(0);
+
+      await transferExpectSuccess(refunCollectionId, refunItemId, alice, bob, 10, 'ReFungible');
+      expect(await getNextSponsored(api, refunCollectionId, normalizeAccountId(alice), refunItemId)).to.be.equal(5);
+
+      // Not existing token 
+      expect(await getNextSponsored(api, refunCollectionId, normalizeAccountId(alice), refunItemId+1)).to.be.equal(-1);
+    });
+  });
+});
modifiedtests/src/util/helpers.tsdiffbeforeafterboth
--- a/tests/src/util/helpers.ts
+++ b/tests/src/util/helpers.ts
@@ -608,6 +608,15 @@
   });
 }
 
+export async function getNextSponsored(
+  api: ApiPromise,
+  collectionId: number,
+  account: string | CrossAccountId,
+  tokenId: number,
+): Promise<number> {
+  return Number((await api.rpc.unique.nextSponsored(collectionId, account, tokenId)).unwrapOr(-1));
+}
+
 export async function toggleContractAllowlistExpectSuccess(sender: IKeyringPair, contractAddress: AccountId | string, value = true) {
   await usingApi(async (api) => {
     const tx = api.tx.unique.toggleContractAllowList(contractAddress, value);