45 lines
1.2 KiB
Solidity
Executable File
45 lines
1.2 KiB
Solidity
Executable File
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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contract Proxy {
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address payable tokenContract;
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address logic;
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address owner;
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constructor(address payable _tokenAddr) {
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owner = tx.origin;
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tokenContract = _tokenAddr;
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}
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function upgradeLogic(address _newLogic) public {
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require(msg.sender == owner);
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logic = _newLogic;
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}
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function changeOwner(address _owner) public {
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require(msg.sender == owner);
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owner = _owner;
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}
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fallback() external payable {
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address _impl = logic;
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assembly {
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let ptr := mload(0x40)
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// (1) copy incoming call data
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calldatacopy(ptr, 0, calldatasize())
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// (2) forward call to logic contract
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let result := delegatecall(gas(), _impl, ptr, calldatasize(), 0, 0)
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let size := returndatasize()
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// (3) retrieve return data
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returndatacopy(ptr, 0, size)
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// (4) forward return data back to caller
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switch result
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case 0 { revert(ptr, size) }
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default { return(ptr, size) }
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}
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}
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} |