[Uniques V2] Basic marketplace functions

bin/node/runtime/src/lib.rs

@@ -1476,6 +1476,10 @@ impl pallet_uniques::Config for Runtime {
 	type Locker = ();
 }
 
+parameter_types! {
+	pub const SellerTipsLimit: u32 = 10;
+}
+
 impl pallet_nfts::Config for Runtime {
 	type Event = Event;
 	type CollectionId = u32;
@@ -1495,6 +1499,7 @@ impl pallet_nfts::Config for Runtime {
 	type Helper = ();
 	type CreateOrigin = AsEnsureOriginWithArg<EnsureSigned<AccountId>>;
 	type Locker = ();
+	type SellerTipsLimit = SellerTipsLimit;
 }
 
 impl pallet_transaction_storage::Config for Runtime {

frame/nfts/src/functions.rs

@@ -48,6 +48,12 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		Account::<T, I>::insert((&dest, &collection, &item), ());
 		let origin = details.owner;
 		details.owner = dest;
+
+		if let Some(ref seller) = details.seller.clone() {
+			details.seller = None;
+			Seller::<T, I>::remove((seller, &collection, &item));
+		}
+
 		Item::<T, I>::insert(&collection, &item, &details);
 		ItemPriceOf::<T, I>::remove(&collection, &item);
 
@@ -168,7 +174,8 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 
 				let owner = owner.clone();
 				Account::<T, I>::insert((&owner, &collection, &item), ());
-				let details = ItemDetails { owner, approved: None, is_frozen: false, deposit };
+				let details =
+					ItemDetails { owner, approved: None, is_frozen: false, deposit, seller: None };
 				Item::<T, I>::insert(&collection, &item, details);
 				Ok(())
 			},

frame/nfts/src/lib.rs

@@ -38,6 +38,7 @@ mod tests;
 mod functions;
 mod impl_nonfungibles;
 mod types;
+mod user_features;
 
 pub mod weights;
 
@@ -155,6 +156,10 @@ pub mod pallet {
 
 		/// Weight information for extrinsics in this pallet.
 		type WeightInfo: WeightInfo;
+
+		/// The maximum amount of seller tips records an item could have.
+		#[pallet::constant]
+		type SellerTipsLimit: Get<u32>;
 	}
 
 	#[pallet::storage]
@@ -267,6 +272,19 @@ pub mod pallet {
 	pub(super) type CollectionMaxSupply<T: Config<I>, I: 'static = ()> =
 		StorageMap<_, Blake2_128Concat, T::CollectionId, u32, OptionQuery>;
 
+	#[pallet::storage]
+	/// Sellers and items they could sell.
+	pub(super) type Seller<T: Config<I>, I: 'static = ()> = StorageNMap<
+		_,
+		(
+			NMapKey<Blake2_128Concat, T::AccountId>, // seller
+			NMapKey<Blake2_128Concat, T::CollectionId>,
+			NMapKey<Blake2_128Concat, T::ItemId>,
+		),
+		ItemSellData<ItemPrice<T, I>, ItemTip<T, I>, T::SellerTipsLimit>,
+		OptionQuery,
+	>;
+
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config<I>, I: 'static = ()> {
@@ -375,6 +393,24 @@ pub mod pallet {
 			seller: T::AccountId,
 			buyer: T::AccountId,
 		},
+		/// A tip was sent.
+		TipSent {
+			collection: T::CollectionId,
+			item: T::ItemId,
+			sender: T::AccountId,
+			receiver: T::AccountId,
+			amount: DepositBalanceOf<T, I>,
+		},
+		/// A seller was set for an item.
+		SellerSet {
+			collection: T::CollectionId,
+			item: T::ItemId,
+			seller: T::AccountId,
+			price: ItemPrice<T, I>,
+			tips: SellerTipsOf<T, I>,
+		},
+		/// A seller was removed from an item.
+		SellerRemoved { collection: T::CollectionId, item: T::ItemId, seller: T::AccountId },
 	}
 
 	#[pallet::error]
@@ -415,6 +451,12 @@ pub mod pallet {
 		NotForSale,
 		/// The provided bid is too low.
 		BidTooLow,
+		/// Wrong seller provided.
+		WrongSeller,
+		/// Wrong price provided.
+		WrongPrice,
+		/// Wrong tips provided.
+		WrongTips,
 	}
 
 	impl<T: Config<I>, I: 'static> Pallet<T, I> {
@@ -1493,5 +1535,93 @@ pub mod pallet {
 			let origin = ensure_signed(origin)?;
 			Self::do_buy_item(collection, item, origin, bid_price)
 		}
+
+		/// Allows to pay the tips.
+		///
+		/// Origin must be Signed.
+		///
+		/// - `tips`: Tips array.
+		///
+		/// Emits `TipSent` on every tip transfer.
+		#[pallet::weight(0)]
+		#[transactional]
+		pub fn pay_tips(origin: OriginFor<T>, tips: Vec<ItemTip<T, I>>) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			Self::do_pay_tips(origin, tips)
+		}
+
+		/// Allows to set the seller for an item and to set the tips those should be paid.
+		///
+		/// Origin must be Signed and must not be the owner of the `item`.
+		///
+		/// - `collection`: The collection of the item.
+		/// - `item`: The item the owner wants to set the seller for.
+		/// - `seller`: Seller's account.
+		/// - `price`: The price for an item.
+		/// - `tips`: Tips those should be paid.
+		///
+		/// Emits `SellerSet` on success.
+		#[pallet::weight(0)]
+		pub fn set_seller(
+			origin: OriginFor<T>,
+			collection: T::CollectionId,
+			item: T::ItemId,
+			seller: AccountIdLookupOf<T>,
+			price: ItemPrice<T, I>,
+			tips: SellerTipsOf<T, I>,
+		) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			let seller = T::Lookup::lookup(seller)?;
+			Self::do_set_seller(collection, item, origin, seller, price, tips)
+		}
+
+		/// Removes the seller from an item.
+		///
+		/// Origin must be Signed and must not be the owner of the `item`.
+		///
+		/// - `collection`: The collection of the item.
+		/// - `item`: The item the owner wants to remove the seller from.
+		/// - `seller`: Previously set seller's account.
+		///
+		/// Emits `SellerRemoved` on success.
+		#[pallet::weight(0)]
+		pub fn remove_seller(
+			origin: OriginFor<T>,
+			collection: T::CollectionId,
+			item: T::ItemId,
+			seller: AccountIdLookupOf<T>,
+		) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			let seller = T::Lookup::lookup(seller)?;
+			Self::do_remove_seller(collection, item, origin, seller)
+		}
+
+		/// Allows to buy an item from the seller.
+		///
+		/// Origin must be Signed and must not be the owner of the `item`.
+		///
+		/// Note: the `price` and `tips` params need to be provided to ensure it won't be
+		/// possible to change them in the state by front-running that call.
+		///
+		/// - `collection`: The collection of the item.
+		/// - `item`: The item the sender wants to buy.
+		/// - `seller`: Previously set seller's account.
+		/// - `price`: Previously set price.
+		/// - `tips`: Previously set tips.
+		///
+		/// Emits `ItemBought` on success.
+		#[pallet::weight(0)]
+		pub fn buy_from_seller(
+			origin: OriginFor<T>,
+			collection: T::CollectionId,
+			item: T::ItemId,
+			seller: AccountIdLookupOf<T>,
+			price: ItemPrice<T, I>,
+			tips: SellerTipsOf<T, I>,
+		) -> DispatchResult {
+			let origin = ensure_signed(origin)?;
+			let seller = T::Lookup::lookup(seller)?;
+			Self::do_buy_from_seller(collection, item, origin, seller, price, tips)
+		}
 	}
 }

frame/nfts/src/mock.rs

@@ -103,6 +103,7 @@ impl Config for Test {
 	type WeightInfo = ();
 	#[cfg(feature = "runtime-benchmarks")]
 	type Helper = ();
+	type SellerTipsLimit = ConstU32<10>;
 }
 
 pub(crate) fn new_test_ext() -> sp_io::TestExternalities {