Add custom metadata storage

pallets/asset/src/benchmarking.rs

@@ -175,7 +175,7 @@ benchmarks! {
 			pallet_chain_space::Pallet::<T>::approve(chain_space_origin, space_id, capacity).expect("Approval should not fail.");
 			Pallet::<T>::create(origin.clone(), entry, digest, authorization_id.clone())?;
 
-		}: _<T::RuntimeOrigin>(origin, issue_entry, issue_entry_digest, authorization_id)
+		}: _<T::RuntimeOrigin>(origin, issue_entry, issue_entry_digest, authorization_id, None)
 		verify {
 			assert_last_event::<T>(Event::Issue { identifier: asset_id, instance: instance_id }.into());
 		}
@@ -265,7 +265,7 @@ benchmarks! {
 			pallet_chain_space::Pallet::<T>::create(origin.clone(), space_digest )?;
 			pallet_chain_space::Pallet::<T>::approve(chain_space_origin, space_id, capacity).expect("Approval should not fail.");
 			Pallet::<T>::create(origin.clone(), entry, digest, authorization_id.clone())?;
-			Pallet::<T>::issue(origin.clone(), issue_entry, issue_entry_digest, authorization_id)?;
+			Pallet::<T>::issue(origin.clone(), issue_entry, issue_entry_digest, authorization_id, None)?;
 
 		}: _<T::RuntimeOrigin>(origin, transfer_entry, transfer_entry_digest)
 		verify {
@@ -346,7 +346,7 @@ benchmarks! {
 			pallet_chain_space::Pallet::<T>::create(origin.clone(), space_digest )?;
 			pallet_chain_space::Pallet::<T>::approve(chain_space_origin, space_id, capacity).expect("Approval should not fail.");
 			Pallet::<T>::create(origin.clone(), entry, digest, authorization_id.clone())?;
-			Pallet::<T>::issue(origin.clone(), issue_entry, issue_entry_digest, authorization_id)?;
+			Pallet::<T>::issue(origin.clone(), issue_entry, issue_entry_digest, authorization_id, None)?;
 
 		}: _<T::RuntimeOrigin>(origin, asset_id.clone(), Some(instance_id.clone()), new_status.clone())
 		verify {

pallets/asset/src/lib.rs

@@ -72,6 +72,9 @@ pub mod pallet {
 	pub type AssetTagOf<T> = BoundedVec<u8, <T as Config>::MaxEncodedValueLength>;
 	pub type AssetMetadataOf<T> = BoundedVec<u8, <T as Config>::MaxEncodedValueLength>;
 
+	pub type AssetKeyOf<T> = BoundedVec<u8, <T as Config>::MaxEncodedValueLength>;
+	pub type AssetValueOf<T> = BoundedVec<u8, <T as Config>::MaxEncodedValueLength>;
+
 	pub type AssetInputEntryOf<T> =
 		AssetInputEntry<AssetDescriptionOf<T>, AssetTypeOf, AssetTagOf<T>, AssetMetadataOf<T>>;
 
@@ -128,6 +131,9 @@ pub mod pallet {
 		#[pallet::constant]
 		type MaxAssetDistribution: Get<u32>;
 
+		#[pallet::constant]
+		type MaxMetaPairLength: Get<u32>;
+
 		/// Weight information for extrinsics in this pallet.
 		type WeightInfo: WeightInfo;
 	}
@@ -185,6 +191,17 @@ pub mod pallet {
 	pub type AssetLookup<T> =
 		StorageMap<_, Blake2_128Concat, EntryHashOf<T>, AssetIdOf, OptionQuery>;
 
+	#[pallet::storage]
+	pub type AssetMeta<T> = StorageDoubleMap<
+		_,
+		Twox64Concat,
+		AssetIdOf,
+		Blake2_128Concat,
+		AssetKeyOf<T>,
+		AssetValueOf<T>,
+		OptionQuery,
+	>;
+
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
@@ -308,6 +325,9 @@ pub mod pallet {
 			entry: AssetIssuanceEntryOf<T>,
 			digest: EntryHashOf<T>,
 			authorization: AuthorizationIdOf,
+			meta: Option<
+				BoundedVec<(AssetKeyOf<T>, AssetValueOf<T>), <T as Config>::MaxMetaPairLength>,
+			>,
 		) -> DispatchResult {
 			let issuer = <T as Config>::EnsureOrigin::ensure_origin(origin)?.subject();
 			let space_id = pallet_chain_space::Pallet::<T>::ensure_authorization_origin(
@@ -320,6 +340,11 @@ pub mod pallet {
 
 			ensure!(asset.asset_issuer == issuer, Error::<T>::UnauthorizedOperation);
 
+			// ensure!(
+			// 	meta.as_ref().map_or(true, |m| m.len() <= T::MaxMetaPairLength as usize),
+			// 	Error::<T>::UnauthorizedOperation
+			// );
+
 			ensure!(AssetStatusOf::ACTIVE == asset.asset_status, Error::<T>::AssetNotActive);
 
 			let issuance_qty = entry.asset_issuance_qty.unwrap_or(1);
@@ -357,6 +382,12 @@ pub mod pallet {
 					.map_err(|_| Error::<T>::DistributionLimitExceeded)
 			})?;
 
+			if let Some(meta) = meta {
+				for (key, value) in meta.iter() {
+					<AssetMeta<T>>::insert(&entry.asset_id, &key, &value);
+				}
+			}
+
 			<AssetLookup<T>>::insert(digest, &entry.asset_id);
 
 			<Issuance<T>>::insert(

pallets/asset/src/mock.rs

@@ -65,6 +65,7 @@ impl mock_origin::Config for Test {
 parameter_types! {
 	pub const MaxEncodedValueLength: u32 = 1_024;
 	pub const MaxAssetDistribution: u32 = u32::MAX;
+	pub const MaxMetaPairLength: u32 = 5;
 }
 
 impl Config for Test {
@@ -73,6 +74,7 @@ impl Config for Test {
 	type OriginSuccess = mock_origin::DoubleOrigin<AccountId, SubjectId>;
 	type MaxEncodedValueLength = MaxEncodedValueLength;
 	type MaxAssetDistribution = MaxAssetDistribution;
+	type MaxMetaPairLength = MaxMetaPairLength;
 	type WeightInfo = ();
 }
 

pallets/asset/src/tests.rs

@@ -158,7 +158,8 @@ fn asset_issue_should_succeed() {
 			DoubleOrigin(author.clone(), creator.clone()).into(),
 			issue_entry.clone(),
 			issue_entry_digest,
-			authorization_id
+			authorization_id,
+			None
 		));
 	});
 }

runtime/src/lib.rs

@@ -798,6 +798,7 @@ impl pallet_network_score::Config for Runtime {
 parameter_types! {
 	pub const MaxEncodedValueLength: u32 = 1_024;
 	pub const MaxAssetDistribution: u32 = u32::MAX;
+	pub const MaxMetaPairLength: u32 = 5;
 }
 
 impl pallet_asset::Config for Runtime {
@@ -806,6 +807,7 @@ impl pallet_asset::Config for Runtime {
 	type OriginSuccess = pallet_did::DidRawOrigin<AccountId, DidIdentifier>;
 	type MaxEncodedValueLength = MaxEncodedValueLength;
 	type MaxAssetDistribution = MaxAssetDistribution;
+	type MaxMetaPairLength = MaxMetaPairLength;
 	type WeightInfo = weights::pallet_asset::WeightInfo<Runtime>;
 }