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25 lines
1.2 KiB
25 lines
1.2 KiB
6 years ago
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pragma solidity ^0.5.0;
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6 years ago
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import "./IERC1820Implementer.sol";
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/**
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* @dev ERC1820Implementer allows your contract to implement an interface for another account in the sense of ERC1820.
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* That account or one of its ERC1820 managers can register the implementer in the ERC1820 registry, but the registry
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* will first check with the implementer if it agrees to it, and only allow it if it does. Using the internal
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* function _registerInterfaceForAddress provided by this contract, you are expressing this agreement,
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* and you will be able to register the contract as an implementer in the registry for that account.
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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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function canImplementInterfaceForAddress(bytes32 interfaceHash, address account) external view returns (bytes32) {
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return _supportedInterfaces[interfaceHash][account] ? ERC1820_ACCEPT_MAGIC : bytes32(0x00);
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}
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function _registerInterfaceForAddress(bytes32 interfaceHash, address account) internal {
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_supportedInterfaces[interfaceHash][account] = true;
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}
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}
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