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// Copyright (C) 2019 David Terry <me@xwvvvvwx.com> | |
// | |
// This program is free software: you can redistribute it and/or modify | |
// it under the terms of the GNU Affero General Public License as published by | |
// the Free Software Foundation, either version 3 of the License, or | |
// (at your option) any later version. | |
// | |
// This program is distributed in the hope that it will be useful, | |
// but WITHOUT ANY WARRANTY; without even the implied warranty of | |
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
// GNU Affero General Public License for more details. | |
// | |
// You should have received a copy of the GNU Affero General Public License | |
// along with this program. If not, see <https://www.gnu.org/licenses/>. | |
pragma solidity >=0.5.0 <0.6.0; | |
import {DSNote} from "ds-note/note.sol"; | |
import {DSAuth, DSAuthority} from "ds-auth/auth.sol"; | |
contract DSPause is DSAuth, DSNote { | |
// --- admin --- | |
modifier wait { require(msg.sender == address(proxy), "ds-pause-undelayed-call"); _; } | |
function setOwner(address owner_) public wait { | |
owner = owner_; | |
emit LogSetOwner(owner); | |
} | |
function setAuthority(DSAuthority authority_) public wait { | |
authority = authority_; | |
emit LogSetAuthority(address(authority)); | |
} | |
function setDelay(uint delay_) public note wait { | |
delay = delay_; | |
} | |
// --- math --- | |
function add(uint x, uint y) internal pure returns (uint z) { | |
z = x + y; | |
require(z >= x, "ds-pause-addition-overflow"); | |
} | |
// --- data --- | |
mapping (bytes32 => bool) public plans; | |
DSPauseProxy public proxy; | |
uint public delay; | |
// --- init --- | |
constructor(uint delay_, address owner_, DSAuthority authority_) public { | |
delay = delay_; | |
owner = owner_; | |
authority = authority_; | |
proxy = new DSPauseProxy(); | |
} | |
// --- util --- | |
function hash(address usr, bytes32 tag, bytes memory fax, uint eta) | |
internal pure | |
returns (bytes32) | |
{ | |
return keccak256(abi.encode(usr, tag, fax, eta)); | |
} | |
function soul(address usr) | |
internal view | |
returns (bytes32 tag) | |
{ | |
assembly { tag := extcodehash(usr) } | |
} | |
// --- operations --- | |
function plot(address usr, bytes32 tag, bytes memory fax, uint eta) | |
public note auth | |
{ | |
require(eta >= add(now, delay), "ds-pause-delay-not-respected"); | |
plans[hash(usr, tag, fax, eta)] = true; | |
} | |
function drop(address usr, bytes32 tag, bytes memory fax, uint eta) | |
public note auth | |
{ | |
plans[hash(usr, tag, fax, eta)] = false; | |
} | |
function exec(address usr, bytes32 tag, bytes memory fax, uint eta) | |
public note | |
returns (bytes memory out) | |
{ | |
require(plans[hash(usr, tag, fax, eta)], "ds-pause-unplotted-plan"); | |
require(soul(usr) == tag, "ds-pause-wrong-codehash"); | |
require(now >= eta, "ds-pause-premature-exec"); | |
plans[hash(usr, tag, fax, eta)] = false; | |
out = proxy.exec(usr, fax); | |
require(proxy.owner() == address(this), "ds-pause-illegal-storage-change"); | |
} | |
} | |
// plans are executed in an isolated storage context to protect the pause from | |
// malicious storage modification during plan execution | |
contract DSPauseProxy { | |
address public owner; | |
modifier auth { require(msg.sender == owner, "ds-pause-proxy-unauthorized"); _; } | |
constructor() public { owner = msg.sender; } | |
function exec(address usr, bytes memory fax) | |
public auth | |
returns (bytes memory out) | |
{ | |
bool ok; | |
(ok, out) = usr.delegatecall(fax); | |
require(ok, "ds-pause-delegatecall-error"); | |
} | |
} |