port assets-erc20 precompile

precompiles/assets-erc20/Cargo.toml

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+[package]
+name = "pallet-evm-precompileset-assets-erc20"
+authors = { workspace = true }
+description = "A Precompile to expose Assets pallet through an ERC20-compliant interface."
+edition = "2021"
+version = "0.1.0"
+
+[dependencies]
+log = { workspace = true }
+num_enum = { workspace = true }
+paste = { workspace = true }
+
+# Moonbeam
+precompile-utils = { workspace = true }
+
+# Substrate
+frame-support = { workspace = true }
+frame-system = { workspace = true }
+pallet-assets = { workspace = true }
+pallet-balances = { workspace = true }
+pallet-timestamp = { workspace = true }
+parity-scale-codec = { workspace = true, features = [ "max-encoded-len" ] }
+scale-info = { workspace = true, features = [ "derive" ] }
+sp-core = { workspace = true }
+sp-io = { workspace = true }
+sp-runtime = { workspace = true }
+sp-std = { workspace = true }
+
+# Frontier
+fp-evm = { workspace = true }
+pallet-evm = { workspace = true, features = [ "forbid-evm-reentrancy" ] }
+
+[dev-dependencies]
+derive_more = { workspace = true }
+hex-literal = { workspace = true }
+libsecp256k1 = { workspace = true }
+serde = { workspace = true }
+sha3 = { workspace = true }
+
+# Moonbeam
+precompile-utils = { workspace = true, features = [ "std", "testing" ] }
+
+pallet-timestamp = { workspace = true, features = [ "std" ] }
+parity-scale-codec = { workspace = true, features = [ "max-encoded-len", "std" ] }
+scale-info = { workspace = true, features = [ "derive" ] }
+sp-runtime = { workspace = true, features = [ "std" ] }
+
+[features]
+default = [ "std" ]
+std = [
+	"fp-evm/std",
+	"frame-support/std",
+	"frame-system/std",
+	"pallet-assets/std",
+	"pallet-balances/std",
+	"pallet-evm/std",
+	"pallet-timestamp/std",
+	"parity-scale-codec/std",
+	"precompile-utils/std",
+	"sp-core/std",
+	"sp-io/std",
+	"sp-runtime/std",
+	"sp-std/std",
+]

precompiles/assets-erc20/ERC20.sol

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+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.8.3;
+
+/// @author The Moonbeam Team
+/// @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.
+    /// @custom:selector 06fdde03
+    function name() external view returns (string memory);
+
+    /// @dev Returns the symbol of the token.
+    /// @custom:selector 95d89b41
+    function symbol() external view returns (string memory);
+
+    /// @dev Returns the decimals places of the token.
+    /// @custom:selector 313ce567
+    function decimals() external view returns (uint8);
+
+    /// @dev Total number of tokens in existence
+    /// @custom:selector 18160ddd
+    function totalSupply() external view returns (uint256);
+
+    /// @dev Gets the balance of the specified address.
+    /// @custom: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.
+    /// @custom: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
+    /// @custom: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
+    /// @custom: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
+    /// @custom: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.
+    /// @custom: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.
+    /// @custom: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
+    );
+}

precompiles/assets-erc20/Permit.sol

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+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.8.3;
+
+/// @author The Moonbeam Team
+/// @title Extension of the ERC20 interface that allows users to
+/// sign permit messages to interact with contracts without needing to
+/// make a first approve transaction.
+interface Permit {
+    /// @dev Consumes an approval permit.
+    /// Anyone can call this function for a permit.
+    /// @custom:selector d505accf
+    /// @param owner Owner of the tokens issuing the permit
+    /// @param spender Address whose allowance will be increased.
+    /// @param value Allowed value.
+    /// @param deadline Timestamp after which the permit will no longer be valid.
+    /// @param v V component of the signature.
+    /// @param r R component of the signature.
+    /// @param s S component of the signature.
+    function permit(
+        address owner,
+        address spender,
+        uint256 value,
+        uint256 deadline,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) external;
+
+    /// @dev Returns the current nonce for given owner.
+    /// A permit must have this nonce to be consumed, which will
+    /// increase the nonce by one.
+    /// @custom:selector 7ecebe00
+    function nonces(address owner) external view returns (uint256);
+
+    /// @dev Returns the EIP712 domain separator. It is used to avoid replay
+    /// attacks accross assets or other similar EIP712 message structures.
+    /// @custom:selector 3644e515
+    function DOMAIN_SEPARATOR() external view returns (bytes32);
+}

precompiles/assets-erc20/Roles.sol

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+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.8.3;
+
+/// @author The Moonbeam Team
+/// @title ERC20 interface Asset Roles
+/// @dev Extension of the ERC20 interface that allows users to get the account capable of fulfilling different asset roles
+/// @custom:address 0xFFFFFFFE + hex(assetId)
+interface Roles {
+    /// @dev Function to check the owner of the asset
+    /// @custom:selector 8da5cb5b
+    /// @return the address of the owner.
+    function owner()
+        external
+        view
+        returns (address);
+
+    /// @dev Function to check the freezer of the asset
+    /// @dev Freezer: the account that can freeze an asset
+    /// @custom:selector 92716054
+    /// @return the address of the freezer.
+    function freezer()
+        external
+        view
+        returns (address);
+
+    /// @dev Function to check the issuer of the asset
+    /// @dev Issuer: the account that can issue tokens for an asset
+    /// @custom:selector 1d143848
+    /// @return the address of the issuer.
+    function issuer()
+        external
+        view
+        returns (address);
+
+    /// @dev Function to check the admin of the asset
+    /// @dev Admin: the account that can unfreeze and force transfer
+    /// @custom:selector f851a440
+    /// @return the address of the admin.
+    function admin()
+        external
+        view
+        returns (address);
+}