38 lines
1.3 KiB
Solidity
38 lines
1.3 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.6.0;
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import "./IERC1820Implementer.sol";
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/**
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* @dev Implementation of the {IERC1820Implementer} interface.
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*
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* Contracts may inherit from this and call {_registerInterfaceForAddress} to
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* declare their willingness to be implementers.
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* {IERC1820Registry-setInterfaceImplementer} should then be called for the
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* registration to be complete.
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*/
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contract ERC1820Implementer is IERC1820Implementer {
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bytes32 constant private _ERC1820_ACCEPT_MAGIC = keccak256(abi.encodePacked("ERC1820_ACCEPT_MAGIC"));
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mapping(bytes32 => mapping(address => bool)) private _supportedInterfaces;
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/**
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* See {IERC1820Implementer-canImplementInterfaceForAddress}.
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*/
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function canImplementInterfaceForAddress(bytes32 interfaceHash, address account) public view override returns (bytes32) {
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return _supportedInterfaces[interfaceHash][account] ? _ERC1820_ACCEPT_MAGIC : bytes32(0x00);
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}
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/**
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* @dev Declares the contract as willing to be an implementer of
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* `interfaceHash` for `account`.
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*
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* See {IERC1820Registry-setInterfaceImplementer} and
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* {IERC1820Registry-interfaceHash}.
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*/
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function _registerInterfaceForAddress(bytes32 interfaceHash, address account) internal virtual {
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_supportedInterfaces[interfaceHash][account] = true;
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}
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}
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