Feature xcmp assets

Cargo.toml

@@ -3,7 +3,14 @@ members = [
     "frame/block-reward",
     "frame/custom-signatures",
     "frame/dapps-staking",
+    "precompiles/assets-erc20",
     "precompiles/dapps-staking",
     "precompiles/sr25519",
     "precompiles/utils",
 ]
+
+[patch.crates-io]
+ethereum = { git = "https://github.com/AstarNetwork/ethereum", branch = "polkadot-v0.9.17" }
+evm = { git = "https://github.com/AstarNetwork/evm", branch = "polkadot-v0.9.17" }
+evm-gasometer = { git = "https://github.com/AstarNetwork/evm", branch = "polkadot-v0.9.17" }
+evm-runtime = { git = "https://github.com/AstarNetwork/evm", branch = "polkadot-v0.9.17" }

precompiles/assets-erc20/Cargo.toml

@@ -0,0 +1,55 @@
+[package]
+name = "pallet-evm-precompile-assets-erc20"
+authors = [ "Stake Technologies", "PureStake" ]
+description = "A Precompile to expose a Assets pallet through an ERC20-compliant interface."
+edition = "2018"
+version = "0.2.0"
+
+[dependencies]
+log = "0.4"
+num_enum = { version = "0.5.3", default-features = false }
+slices = "0.2.0"
+
+# Moonbeam
+precompile-utils = { path = "../utils", default-features = false }
+
+# Substrate
+codec = { package = "parity-scale-codec", version = "2.0.0", default-features = false, features = [ "max-encoded-len" ] }
+frame-support = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+frame-system = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+pallet-assets = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+pallet-balances = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+sp-core = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+sp-io = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+sp-std = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17", default-features = false }
+
+# Frontier
+fp-evm = { git = "https://github.com/AstarNetwork/frontier", branch = "polkadot-v0.9.17", default-features = false }
+pallet-evm = { git = "https://github.com/AstarNetwork/frontier", branch = "polkadot-v0.9.17", default-features = false }
+
+[dev-dependencies]
+derive_more = { version = "0.99" }
+serde = { version = "1.0.100" }
+sha3 = "0.8"
+
+codec = { package = "parity-scale-codec", version = "2.0.0", features = [ "max-encoded-len" ] }
+pallet-timestamp = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17" }
+scale-info = { version = "1.0", default-features = false, features = [ "derive" ] }
+sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.17" }
+
+[features]
+default = [ "std" ]
+std = [
+	"codec/std",
+	"fp-evm/std",
+	"frame-support/std",
+	"frame-system/std",
+	"pallet-assets/std",
+	"pallet-evm/std",
+	"precompile-utils/std",
+	"sp-core/std",
+	"sp-io/std",
+	"sp-runtime/std",
+	"sp-std/std",
+]

precompiles/assets-erc20/ERC20.sol

@@ -0,0 +1,111 @@
+ pragma solidity ^0.8.0;
+
+    /**
+     * @title ERC20 interface
+     * @dev see https://github.com/ethereum/EIPs/issues/20
+     * @dev copied from https://github.com/OpenZeppelin/openzeppelin-contracts
+     */
+    interface IERC20 {
+
+    /**
+    * @dev Returns the name of the token.
+    * Selector: 06fdde03
+    */
+    function name() external view returns (string memory);
+
+    /**
+    * @dev Returns the symbol of the token.
+    * Selector: 95d89b41
+    */
+    function symbol() external view returns (string memory);
+
+    /**
+    * @dev Returns the decimals places of the token.
+    * Selector: 313ce567
+    */
+    function decimals() external view returns (uint8);
+
+    /**
+     * @dev Total number of tokens in existence
+     * Selector: 18160ddd
+     */
+    function totalSupply() external view returns (uint256);
+
+    /**
+     * @dev Gets the balance of the specified address.
+     * Selector: 70a08231
+     * @param who The address to query the balance of.
+     * @return An uint256 representing the amount owned by the passed address.
+     */
+    function balanceOf(address who) external view returns (uint256);
+
+    /**
+     * @dev Function to check the amount of tokens that an owner allowed to a spender.
+     * Selector: dd62ed3e
+     * @param owner address The address which owns the funds.
+     * @param spender address The address which will spend the funds.
+     * @return A uint256 specifying the amount of tokens still available for the spender.
+     */
+    function allowance(address owner, address spender)
+        external view returns (uint256);
+
+    /**
+     * @dev Transfer token for a specified address
+     * Selector: a9059cbb
+     * @param to The address to transfer to.
+     * @param value The amount to be transferred.
+     */
+    function transfer(address to, uint256 value) external returns (bool);
+
+    /**
+     * @dev Approve the passed address to spend the specified amount of tokens on behalf
+     * of msg.sender.
+     * Beware that changing an allowance with this method brings the risk that someone may
+     * use both the old
+     * and the new allowance by unfortunate transaction ordering. One possible solution to
+     * mitigate this race condition is to first reduce the spender's allowance to 0 and set
+     * the desired value afterwards:
+     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+     * Selector: 095ea7b3
+     * @param spender The address which will spend the funds.
+     * @param value The amount of tokens to be spent.
+     */
+    function approve(address spender, uint256 value)
+        external returns (bool);
+
+    /**
+     * @dev Transfer tokens from one address to another
+     * Selector: 23b872dd
+     * @param from address The address which you want to send tokens from
+     * @param to address The address which you want to transfer to
+     * @param value uint256 the amount of tokens to be transferred
+     */
+    function transferFrom(address from, address to, uint256 value)
+        external returns (bool);
+
+    /**
+     * @dev Event emited when a transfer has been performed.
+     * Selector: ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef
+     * @param from address The address sending the tokens
+     * @param to address The address receiving the tokens.
+     * @param value uint256 The amount of tokens transfered.
+     */
+    event Transfer(
+        address indexed from,
+        address indexed to,
+        uint256 value
+    );
+
+    /**
+     * @dev Event emited when an approval has been registered.
+     * Selector: 8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925
+     * @param owner address Owner of the tokens.
+     * @param spender address Allowed spender.
+     * @param value uint256 Amount of tokens approved.
+     */
+    event Approval(
+        address indexed owner,
+        address indexed spender,
+        uint256 value
+    );
+}