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https://github.com/datahaven-xyz/datahaven
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479af2e192
## Summary This PR adds Moonbeam's CallPermit precompile to DataHaven, enabling gasless meta-transactions through EIP-712 signature-based permissions. Users can sign transaction permits offline, allowing relayers to execute transactions on their behalf while maintaining full security and authentication. ## Key Features ### CallPermit Precompile Functions - **`dispatch(address from, address to, uint256 value, bytes data, uint64[] gasLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s)`**: Execute permitted calls with signature verification - **`nonces(address owner)`**: Get current nonce for permit validation ### Technical Implementation - **Address**: `0x080A` (2058 in decimal) - **EIP-712 Compliance**: Structured signature validation with proper domain separation - **Nonce Management**: Per-user nonce tracking for replay protection - **Deadline Validation**: Time-bound permits for enhanced security - **Gas Forwarding**: Proper gas limit enforcement and forwarding Depends on https://github.com/datahaven-xyz/datahaven/pull/137 --------- Co-authored-by: Claude <noreply@anthropic.com>
54 lines
2.4 KiB
Solidity
54 lines
2.4 KiB
Solidity
// SPDX-License-Identifier: GPL-3.0-only
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pragma solidity >=0.8.3;
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/// @dev The CallPermit contract's address.
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address constant CALL_PERMIT_ADDRESS = 0x000000000000000000000000000000000000080a;
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/// @dev The CallPermit contract's instance.
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CallPermit constant CALL_PERMIT_CONTRACT = CallPermit(CALL_PERMIT_ADDRESS);
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/// @author The Moonbeam Team
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/// @title Call Permit Interface
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/// @dev The interface aims to be a general-purpose tool to perform gas-less transactions. It uses the EIP-712 standard,
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/// and signed messages can be dispatched by another network participant with a transaction
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/// @custom:address 0x000000000000000000000000000000000000080a
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interface CallPermit {
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/// @dev Dispatch a call on the behalf of an other user with a EIP712 permit.
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/// Will revert if the permit is not valid or if the dispatched call reverts or errors (such as
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/// out of gas).
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/// If successful the EIP712 nonce is increased to prevent this permit to be replayed.
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/// @param from Who made the permit and want its call to be dispatched on their behalf.
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/// @param to Which address the call is made to.
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/// @param value Value being transfered from the "from" account.
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/// @param data Call data
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/// @param gaslimit Gaslimit the dispatched call requires.
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/// Providing it prevents the dispatcher to manipulate the gaslimit.
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/// @param deadline Deadline in UNIX seconds after which the permit will no longer be valid.
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/// @param v V part of the signature.
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/// @param r R part of the signature.
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/// @param s S part of the signature.
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/// @return output Output of the call.
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/// @custom:selector b5ea0966
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function dispatch(
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address from,
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address to,
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uint256 value,
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bytes memory data,
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uint64 gaslimit,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) external returns (bytes memory output);
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/// @dev Returns the current nonce for given owner.
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/// A permit must have this nonce to be consumed, which will
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/// increase the nonce by one.
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/// @custom:selector 7ecebe00
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function nonces(address owner) external view returns (uint256);
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/// @dev Returns the EIP712 domain separator. It is used to avoid replay
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/// attacks accross assets or other similar EIP712 message structures.
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/// @custom:selector 3644e515
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function DOMAIN_SEPARATOR() external view returns (bytes32);
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}
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