89 lines
3.7 KiB
Solidity
89 lines
3.7 KiB
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity 0.8.17;
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import "openzeppelin-contracts/interfaces/IERC20.sol";
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import "openzeppelin-contracts/interfaces/IERC165.sol";
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/// @title Interface for IERC5827 contracts
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/// @notice Please see https://eips.ethereum.org/EIPS/eip-5827 for more details on the goals of this interface
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/// @author Zac (zlace0x), zhongfu (zhongfu), Edison (edison0xyz)
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interface IERC5827 is IERC20, IERC165 {
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/// Note: the ERC-165 identifier for this interface is 0x93cd7af6.
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/// 0x93cd7af6 ===
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/// bytes4(keccak256('approveRenewable(address,uint256,uint256)')) ^
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/// bytes4(keccak256('renewableAllowance(address,address)')) ^
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/// bytes4(keccak256('approve(address,uint256)') ^
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/// bytes4(keccak256('transferFrom(address,address,uint256)') ^
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/// bytes4(keccak256('allowance(address,address)') ^
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/// @dev Thrown when there available allowance is lesser than transfer amount
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/// @param available Allowance available, 0 if unset
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error InsufficientRenewableAllowance(uint256 available);
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/// @notice Emitted when a new renewable allowance is set.
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/// @param _owner owner of token
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/// @param _spender allowed spender of token
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/// @param _value initial and maximum allowance given to spender
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/// @param _recoveryRate recovery amount per second
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event RenewableApproval(
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address indexed _owner,
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address indexed _spender,
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uint256 _value,
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uint256 _recoveryRate
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);
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/// @notice Grants an allowance of `_value` to `_spender` initially, which recovers over time based on `_recoveryRate` up to a limit of `_value`.
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/// SHOULD throw when `_recoveryRate` is larger than `_value`.
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/// MUST emit `RenewableApproval` event.
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/// @param _spender allowed spender of token
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/// @param _value initial and maximum allowance given to spender
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/// @param _recoveryRate recovery amount per second
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function approveRenewable(
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address _spender,
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uint256 _value,
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uint256 _recoveryRate
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) external returns (bool success);
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/// @notice Returns approved max amount and recovery rate.
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/// @return amount initial and maximum allowance given to spender
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/// @return recoveryRate recovery amount per second
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function renewableAllowance(
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address _owner,
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address _spender
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) external view returns (uint256 amount, uint256 recoveryRate);
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/// Overridden EIP-20 functions
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/// @notice Grants a (non-increasing) allowance of _value to _spender.
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/// MUST clear set _recoveryRate to 0 on the corresponding renewable allowance, if any.
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/// @param _spender allowed spender of token
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/// @param _value allowance given to spender
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function approve(
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address _spender,
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uint256 _value
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) external returns (bool success);
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/// @notice Moves `amount` tokens from `from` to `to` using the
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/// allowance mechanism. `amount` is then deducted from the caller's
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/// allowance factoring in recovery rate logic.
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/// SHOULD throw when there is insufficient allowance
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/// @param from token owner address
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/// @param to token recipient
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/// @param amount amount of token to transfer
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/// @return success True if the function is successful, false if otherwise
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) external returns (bool success);
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/// @notice Returns amounts spendable by `_spender`.
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/// @param _owner Address of the owner
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/// @param _spender spender of token
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/// @return remaining allowance at the current point in time
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function allowance(
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address _owner,
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address _spender
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) external view returns (uint256 remaining);
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}
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