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pragma solidity ^0.7.0;
interface AccountImplementations {
function getImplementation(bytes4 _sig) external view returns (address);
}
contract InstaAccountV2 {
AccountImplementations public immutable implementations;
constructor(address _implementations) {
implementations = AccountImplementations(_implementations);
}
function _delegate(address implementation) internal {
assembly {
calldatacopy(0, 0, calldatasize())
let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
returndatacopy(0, 0, returndatasize())
switch result
case 0 { revert(0, returndatasize()) }
default { return(0, returndatasize()) }
}
}
function _fallback(bytes4 _sig) internal {
address _implementation = implementations.getImplementation(_sig);
require(_implementation != address(0), "InstaAccountV2: Not able to find _implementation");
_delegate(_implementation);
}
fallback () external payable {
_fallback(msg.sig);
}
receive () external payable {
if (msg.sig != 0x00000000) {
_fallback(msg.sig);
}
}
}
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