--- a/runtime/src/chain_extension.rs
+++ /dev/null
@@ -1,234 +0,0 @@
-//! NFT Chain Extension
-
-//
-// This file is subject to the terms and conditions defined in
-// file 'LICENSE', which is part of this source code package.
-//
-
-use codec::{Decode, Encode};
-use max_encoded_len::MaxEncodedLen;
-use derivative::Derivative;
-
-pub use pallet_contracts::chain_extension::RetVal;
-use pallet_contracts::chain_extension::{
-	ChainExtension, Environment, Ext, InitState, SysConfig, UncheckedFrom,
-};
-
-pub use frame_support::debug;
-use frame_support::dispatch::DispatchError;
-
-extern crate pallet_nft;
-pub use pallet_nft::*;
-use pallet_nft::CrossAccountId;
-use nft_data_structs::*;
-
-/// Create item parameters
-#[derive(Debug, PartialEq, Encode, Decode, MaxEncodedLen)]
-pub struct NFTExtCreateItem<AccountId> {
-	pub owner: AccountId,
-	pub collection_id: u32,
-	pub data: CreateItemData,
-}
-
-/// Transfer parameters
-#[derive(Debug, PartialEq, Encode, Decode, MaxEncodedLen)]
-pub struct NFTExtTransfer<AccountId> {
-	pub recipient: AccountId,
-	pub collection_id: u32,
-	pub token_id: u32,
-	pub amount: u128,
-}
-
-#[derive(Derivative, PartialEq, Encode, Decode, MaxEncodedLen)]
-#[derivative(Debug)]
-pub struct NFTExtCreateMultipleItems<AccountId> {
-	pub owner: AccountId,
-	pub collection_id: u32,
-	#[derivative(Debug = "ignore")]
-	pub data: BoundedVec<CreateItemData, MaxItemsPerBatch>,
-}
-
-#[derive(Debug, PartialEq, Encode, Decode, MaxEncodedLen)]
-pub struct NFTExtApprove<AccountId> {
-	pub spender: AccountId,
-	pub collection_id: u32,
-	pub item_id: u32,
-	pub amount: u128,
-}
-
-#[derive(Debug, PartialEq, Encode, Decode, MaxEncodedLen)]
-pub struct NFTExtTransferFrom<AccountId> {
-	pub owner: AccountId,
-	pub recipient: AccountId,
-	pub collection_id: u32,
-	pub item_id: u32,
-	pub amount: u128,
-}
-
-#[derive(Derivative, PartialEq, Encode, Decode, MaxEncodedLen)]
-#[derivative(Debug)]
-pub struct NFTExtSetVariableMetaData {
-	pub collection_id: u32,
-	pub item_id: u32,
-	#[derivative(Debug = "ignore")]
-	pub data: BoundedVec<u8, MaxDataSize>,
-}
-
-#[derive(Debug, PartialEq, Encode, Decode, MaxEncodedLen)]
-pub struct NFTExtToggleWhiteList<AccountId> {
-	pub collection_id: u32,
-	pub address: AccountId,
-	pub whitelisted: bool,
-}
-
-/// The chain Extension of NFT pallet
-pub struct NFTExtension;
-
-pub type NftWeightInfoOf<C> = <C as pallet_nft::Config>::WeightInfo;
-
-pub type AccountIdOf<C> = <C as SysConfig>::AccountId;
-
-impl<C: Config + pallet_contracts::Config> ChainExtension<C> for NFTExtension {
-	fn call<E: Ext>(func_id: u32, env: Environment<E, InitState>) -> Result<RetVal, DispatchError>
-	where
-		E: Ext<T = C>,
-		C: pallet_nft::Config,
-		<E::T as SysConfig>::AccountId: UncheckedFrom<<E::T as SysConfig>::Hash> + AsRef<[u8]>,
-	{
-		// The memory of the vm stores buf in scale-codec
-		match func_id {
-			0 => {
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtTransfer<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::transfer())?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::transfer_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&C::CrossAccountId::from_sub(input.recipient),
-					&collection,
-					input.token_id,
-					input.amount,
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			1 => {
-				// Create Item
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtCreateItem<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::create_item(input.data.data_size()))?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::create_item_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&collection,
-					&C::CrossAccountId::from_sub(input.owner),
-					input.data,
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			2 => {
-				// Create multiple items
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtCreateMultipleItems<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::create_item(
-					input.data.iter().map(|i| i.data_size()).sum(),
-				))?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::create_multiple_items_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&collection,
-					&C::CrossAccountId::from_sub(input.owner),
-					input.data.into_inner(),
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			3 => {
-				// Approve
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtApprove<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::approve())?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::approve_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&C::CrossAccountId::from_sub(input.spender),
-					&collection,
-					input.item_id,
-					input.amount,
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			4 => {
-				// Transfer from
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtTransferFrom<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::transfer_from())?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::transfer_from_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&C::CrossAccountId::from_sub(input.owner),
-					&C::CrossAccountId::from_sub(input.recipient),
-					&collection,
-					input.item_id,
-					input.amount,
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			5 => {
-				// Set variable metadata
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtSetVariableMetaData = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::set_variable_meta_data())?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::set_variable_meta_data_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&collection,
-					input.item_id,
-					input.data.into_inner(),
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			6 => {
-				// Toggle whitelist
-				let mut env = env.buf_in_buf_out();
-				let input: NFTExtToggleWhiteList<AccountIdOf<C>> = env.read_as()?;
-				env.charge_weight(NftWeightInfoOf::<C>::add_to_white_list())?;
-
-				let collection = pallet_nft::Module::<C>::get_collection(input.collection_id)?;
-
-				pallet_nft::Module::<C>::toggle_white_list_internal(
-					&C::CrossAccountId::from_sub(env.ext().address().clone()),
-					&collection,
-					&C::CrossAccountId::from_sub(input.address),
-					input.whitelisted,
-				)?;
-
-				collection.submit_logs()?;
-				Ok(RetVal::Converging(0))
-			}
-			_ => Err(DispatchError::Other("unknown chain_extension func_id")),
-		}
-	}
-}