65 lines
2.7 KiB
Solidity
65 lines
2.7 KiB
Solidity
pragma solidity ^0.4.20;
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// Adapted from https://gist.github.com/VladLupashevskyi/84f18eabb1e4afadf572cf92af3e7e7f
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// and: https://github.com/poanetwork/posdao-contracts/blob/master/contracts/TxPermission.sol
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contract TxPermission {
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/// Allowed transaction types mask
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uint32 constant None = 0;
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uint32 constant All = 0xffffffff;
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uint32 constant Basic = 0x01;
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uint32 constant Call = 0x02;
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uint32 constant Create = 0x04;
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uint32 constant Private = 0x08;
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/// Contract name
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function contractName() public constant returns (string) {
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return "TX_PERMISSION_CONTRACT";
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}
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/// Contract name hash
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function contractNameHash() public constant returns (bytes32) {
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return keccak256(contractName());
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}
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/// Contract version
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function contractVersion() public constant returns (uint256) {
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return 4;
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}
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/// @dev Defines the allowed transaction types which may be initiated by the specified sender with
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/// the specified gas price and data. Used by node's engine each time a transaction is about to be
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/// included into a block. See https://openethereum.github.io/Permissioning.html#how-it-works-1
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/// @param _sender Transaction sender address.
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/// @param _to Transaction recipient address. If creating a contract, the `_to` address is zero.
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/// @param _value Transaction amount in wei.
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/// @param _maxFeePerGas The `maxFeePerGas` in Wei for EIP-1559 transaction, or gas price for a legacy transaction.
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/// @param _maxInclusionFeePerGas The `maxInclusionFeePerGas` in Wei for EIP-1559 transaction.
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/// Equals to gas price for a legacy transaction.
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/// @param _gasLimit Gas limit for the transaction.
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/// @param _data Transaction data.
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/// @return `uint32 typesMask` - Set of allowed transactions for `_sender` depending on tx `_to` address,
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/// `_gasPrice`, and `_data`. The result is represented as a set of flags:
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/// 0x01 - basic transaction (e.g. ether transferring to user wallet);
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/// 0x02 - contract call;
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/// 0x04 - contract creation;
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/// 0x08 - private transaction.
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/// `bool cache` - If `true` is returned, the same permissions will be applied from the same
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/// `_sender` without calling this contract again.
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function allowedTxTypes(
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address _sender,
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address _to,
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uint256 _value,
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uint256 _maxFeePerGas, // equals to gasPrice for legacy transactions
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uint256 _maxInclusionFeePerGas, // equals to gasPrice for legacy transactions
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uint256 _gasLimit,
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bytes memory _data
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)
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public
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view
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returns(uint32 typesMask, bool cache)
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{
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if (_maxFeePerGas > 0 || _data.length < 4) return (All, false);
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return (None, false);
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}
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} |