Add nft module

Cargo.dev.toml

@@ -11,4 +11,5 @@ members = [
 	"utilities",
 	"vesting",
 	"rewards",
+  "nft",
 ]

nft/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "orml-nft"
+description = "Utility pallet to perform ROOT calls in a PoA network"
+repository = "https://github.com/open-web3-stack/open-runtime-module-library/tree/master/nft"
+license = "Apache-2.0"
+version = "0.2.1-dev"
+authors = ["Acala Developers"]
+edition = "2018"
+
+[dependencies]
+codec = { package = "parity-scale-codec", version = "1.3.0", default-features = false }
+sp-std = { version = "2.0.0", default-features = false }
+sp-runtime = { version = "2.0.0", default-features = false }
+
+frame-support = { version = "2.0.0", default-features = false }
+frame-system = { version = "2.0.0", default-features = false }
+
+[dev-dependencies]
+sp-io = { version = "2.0.0", default-features = false }
+sp-core = { version = "2.0.0", default-features = false }
+
+[features]
+default = ["std"]
+std = [
+	"codec/std",
+	"sp-std/std",
+	"sp-runtime/std",
+	"frame-support/std",
+	"frame-system/std",
+]

nft/README.md

@@ -0,0 +1,11 @@
+# Non-fungible-token module
+
+### Overview
+
+Non-fungible-token module provides basic functions to create and manager NFT(non fungible token) such as `create_class`, `transfer`, `mint`, `burn`, `destroy_class`.
+
+- `create_class` create NFT(non fungible token) class
+- `transfer` transfer NFT(non fungible token) to another account.
+- `mint` mint NFT(non fungible token)
+- `burn` burn NFT(non fungible token)
+- `destroy_class` destroy NFT(non fungible token) class

nft/src/lib.rs

@@ -0,0 +1,219 @@
+//! # Non Fungible Token
+//! The module provides implementations for non-fungible-token.
+//!
+//! - [`Trait`](./trait.Trait.html)
+//! - [`Call`](./enum.Call.html)
+//! - [`Module`](./struct.Module.html)
+//!
+//! ## Overview
+//!
+//! This module provides basic functions to create and manager
+//! NFT(non fungible token) such as `create_class`, `transfer`, `mint`, `burn`.
+
+//! ### Module Functions
+//!
+//! - `create_class` - Create NFT(non fungible token) class
+//! - `transfer` - Transfer NFT(non fungible token) to another account.
+//! - `mint` - Mint NFT(non fungible token)
+//! - `burn` - Burn NFT(non fungible token)
+//! - `destroy_class` - Destroy NFT(non fungible token) class
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use codec::{Decode, Encode};
+use frame_support::{decl_error, decl_module, decl_storage, ensure, Parameter};
+use sp_runtime::{
+	traits::{AtLeast32BitUnsigned, CheckedAdd, CheckedSub, Member, One, Zero},
+	DispatchError, DispatchResult, RuntimeDebug,
+};
+use sp_std::vec::Vec;
+
+mod mock;
+mod tests;
+
+pub type CID = Vec<u8>;
+
+/// Class info
+#[derive(Encode, Decode, Clone, Eq, PartialEq, RuntimeDebug)]
+pub struct ClassInfo<TokenId, AccountId, Data> {
+	/// Class metadata
+	pub metadata: CID,
+	/// Total issuance for the class
+	pub total_issuance: TokenId,
+	/// Class owner
+	pub owner: AccountId,
+	/// Class Properties
+	pub data: Data,
+}
+
+/// Token info
+#[derive(Encode, Decode, Clone, Eq, PartialEq, RuntimeDebug)]
+pub struct TokenInfo<AccountId, Data> {
+	/// Token metadata
+	pub metadata: CID,
+	/// Token owner
+	pub owner: AccountId,
+	/// Token Properties
+	pub data: Data,
+}
+
+pub trait Trait: frame_system::Trait {
+	/// The class ID type
+	type ClassId: Parameter + Member + AtLeast32BitUnsigned + Default + Copy;
+	/// The token ID type
+	type TokenId: Parameter + Member + AtLeast32BitUnsigned + Default + Copy;
+	/// The class properties type
+	type ClassData: Parameter + Member;
+	/// The token properties type
+	type TokenData: Parameter + Member;
+}
+
+decl_error! {
+	/// Error for non-fungible-token module.
+	pub enum Error for Module<T: Trait> {
+		/// No available class ID
+		NoAvailableClassId,
+		/// No available token ID
+		NoAvailableTokenId,
+		/// Token(ClassId, TokenId) not found
+		TokenNotFound,
+		/// Class not found
+		ClassNotFound,
+		/// The operator is not the owner of the token and has no permission
+		NoPermission,
+		/// Arithmetic calculation overflow
+		NumOverflow,
+		/// Can not destroy class
+		/// Total issuance is not 0
+		CannotDestroyClass,
+	}
+}
+
+pub type ClassInfoOf<T> =
+	ClassInfo<<T as Trait>::TokenId, <T as frame_system::Trait>::AccountId, <T as Trait>::ClassData>;
+pub type TokenInfoOf<T> = TokenInfo<<T as frame_system::Trait>::AccountId, <T as Trait>::TokenData>;
+
+decl_storage! {
+	trait Store for Module<T: Trait> as NonFungibleToken {
+		/// Next available class ID.
+		pub NextClassId get(fn next_class_id): T::ClassId;
+		/// Next available token ID.
+		pub NextTokenId get(fn next_token_id): T::TokenId;
+		/// Store class info.
+		///
+		/// Returns `None` if class info not set or removed.
+		pub Classes get(fn classes): map hasher(twox_64_concat) T::ClassId => Option<ClassInfoOf<T>>;
+		/// Store token info.
+		///
+		/// Returns `None` if token info not set or removed.
+		pub Tokens get(fn tokens): double_map hasher(twox_64_concat) T::ClassId, hasher(twox_64_concat) T::TokenId => Option<TokenInfoOf<T>>;
+		/// Token existence check by owner and class ID.
+		pub TokensByOwner get(fn tokens_by_owner): double_map hasher(twox_64_concat) T::AccountId, hasher(twox_64_concat) (T::ClassId, T::TokenId) => Option<()>;
+	}
+}
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+	}
+}
+
+impl<T: Trait> Module<T> {
+	/// Create NFT(non fungible token) class
+	pub fn create_class(owner: &T::AccountId, metadata: CID, data: T::ClassData) -> Result<T::ClassId, DispatchError> {
+		let class_id = NextClassId::<T>::try_mutate(|id| -> Result<T::ClassId, DispatchError> {
+			let current_id = *id;
+			*id = id.checked_add(&One::one()).ok_or(Error::<T>::NoAvailableClassId)?;
+			Ok(current_id)
+		})?;
+
+		let info = ClassInfo {
+			metadata,
+			total_issuance: Default::default(),
+			owner: owner.clone(),
+			data,
+		};
+		Classes::<T>::insert(class_id, info);
+
+		Ok(class_id)
+	}
+
+	/// Transfer NFT(non fungible token) from `from` account to `to` account
+	pub fn transfer(from: &T::AccountId, to: &T::AccountId, token: (T::ClassId, T::TokenId)) -> DispatchResult {
+		if from == to {
+			return Ok(());
+		}
+
+		TokensByOwner::<T>::try_mutate_exists(from, token, |token_by_owner| -> DispatchResult {
+			ensure!(token_by_owner.take().is_some(), Error::<T>::NoPermission);
+			TokensByOwner::<T>::insert(to, token, ());
+
+			Tokens::<T>::try_mutate_exists(token.0, token.1, |token_info| -> DispatchResult {
+				let mut info = token_info.as_mut().ok_or(Error::<T>::TokenNotFound)?;
+				info.owner = to.clone();
+				Ok(())
+			})
+		})
+	}
+
+	/// Mint NFT(non fungible token) to `owner`
+	pub fn mint(
+		owner: &T::AccountId,
+		class_id: T::ClassId,
+		metadata: CID,
+		data: T::TokenData,
+	) -> Result<T::TokenId, DispatchError> {
+		NextTokenId::<T>::try_mutate(|id| -> Result<T::TokenId, DispatchError> {
+			let token_id = *id;
+			*id = id.checked_add(&One::one()).ok_or(Error::<T>::NoAvailableTokenId)?;
+
+			Classes::<T>::try_mutate(class_id, |class_info| -> DispatchResult {
+				let info = class_info.as_mut().ok_or(Error::<T>::ClassNotFound)?;
+				info.total_issuance = info
+					.total_issuance
+					.checked_add(&One::one())
+					.ok_or(Error::<T>::NumOverflow)?;
+				Ok(())
+			})?;
+
+			let token_info = TokenInfo {
+				metadata,
+				owner: owner.clone(),
+				data,
+			};
+			Tokens::<T>::insert(class_id, token_id, token_info);
+			TokensByOwner::<T>::insert(owner, (class_id, token_id), ());
+
+			Ok(token_id)
+		})
+	}
+
+	/// Burn NFT(non fungible token) from `owner`
+	pub fn burn(owner: &T::AccountId, token: (T::ClassId, T::TokenId)) -> DispatchResult {
+		Tokens::<T>::try_mutate_exists(token.0, token.1, |token_info| -> DispatchResult {
+			ensure!(token_info.take().is_some(), Error::<T>::TokenNotFound);
+
+			TokensByOwner::<T>::try_mutate_exists(owner, token, |info| -> DispatchResult {
+				ensure!(info.take().is_some(), Error::<T>::NoPermission);
+
+				Classes::<T>::try_mutate(token.0, |class_info| -> DispatchResult {
+					let info = class_info.as_mut().ok_or(Error::<T>::ClassNotFound)?;
+					info.total_issuance = info
+						.total_issuance
+						.checked_sub(&One::one())
+						.ok_or(Error::<T>::NumOverflow)?;
+					Ok(())
+				})
+			})
+		})
+	}
+
+	/// Destroy NFT(non fungible token) class
+	pub fn destroy_class(owner: &T::AccountId, class_id: T::ClassId) -> DispatchResult {
+		Classes::<T>::try_mutate_exists(class_id, |class_info| -> DispatchResult {
+			let info = class_info.take().ok_or(Error::<T>::ClassNotFound)?;
+			ensure!(info.owner == *owner, Error::<T>::NoPermission);
+			ensure!(info.total_issuance == Zero::zero(), Error::<T>::CannotDestroyClass);
+			Ok(())
+		})
+	}
+}

nft/src/mock.rs

@@ -0,0 +1,90 @@
+//! Mocks for the gradually-update module.
+
+#![cfg(test)]
+
+use frame_support::{impl_outer_origin, parameter_types};
+use sp_core::H256;
+use sp_runtime::{testing::Header, traits::IdentityLookup, Perbill};
+
+use super::*;
+
+impl_outer_origin! {
+	pub enum Origin for Runtime {}
+}
+
+// Workaround for https://github.com/rust-lang/rust/issues/26925 . Remove when sorted.
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub struct Runtime;
+parameter_types! {
+	pub const BlockHashCount: u64 = 250;
+	pub const MaximumBlockWeight: u32 = 1024;
+	pub const MaximumBlockLength: u32 = 2 * 1024;
+	pub const AvailableBlockRatio: Perbill = Perbill::one();
+}
+
+pub type AccountId = u128;
+pub type BlockNumber = u64;
+
+impl frame_system::Trait for Runtime {
+	type Origin = Origin;
+	type Index = u64;
+	type BlockNumber = BlockNumber;
+	type Call = ();
+	type Hash = H256;
+	type Hashing = ::sp_runtime::traits::BlakeTwo256;
+	type AccountId = AccountId;
+	type Lookup = IdentityLookup<Self::AccountId>;
+	type Header = Header;
+	type Event = ();
+	type BlockHashCount = BlockHashCount;
+	type MaximumBlockWeight = MaximumBlockWeight;
+	type MaximumBlockLength = MaximumBlockLength;
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = ();
+	type PalletInfo = ();
+	type AccountData = ();
+	type OnNewAccount = ();
+	type OnKilledAccount = ();
+	type DbWeight = ();
+	type BlockExecutionWeight = ();
+	type ExtrinsicBaseWeight = ();
+	type MaximumExtrinsicWeight = ();
+	type BaseCallFilter = ();
+	type SystemWeightInfo = ();
+}
+pub type System = frame_system::Module<Runtime>;
+
+impl Trait for Runtime {
+	type ClassId = u64;
+	type TokenId = u64;
+	type ClassData = ();
+	type TokenData = ();
+}
+pub type NonFungibleTokenModule = Module<Runtime>;
+
+pub const ALICE: AccountId = 1;
+pub const BOB: AccountId = 2;
+pub const CLASS_ID: <Runtime as Trait>::ClassId = 0;
+pub const CLASS_ID_NOT_EXIST: <Runtime as Trait>::ClassId = 1;
+pub const TOKEN_ID: <Runtime as Trait>::TokenId = 0;
+pub const TOKEN_ID_NOT_EXIST: <Runtime as Trait>::TokenId = 1;
+
+pub struct ExtBuilder;
+
+impl Default for ExtBuilder {
+	fn default() -> Self {
+		ExtBuilder
+	}
+}
+
+impl ExtBuilder {
+	pub fn build(self) -> sp_io::TestExternalities {
+		let t = frame_system::GenesisConfig::default()
+			.build_storage::<Runtime>()
+			.unwrap();
+
+		let mut ext = sp_io::TestExternalities::new(t);
+		ext.execute_with(|| System::set_block_number(1));
+		ext
+	}
+}