116 lines
3.4 KiB
Solidity
116 lines
3.4 KiB
Solidity
/*
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Copyright 2018 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity ^0.4.14;
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import { Ownable } from "zeppelin-solidity/contracts/ownership/Ownable.sol";
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import { ERC20 as Token } from "zeppelin-solidity/contracts/token/ERC20/ERC20.sol";
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/// @title TokenTransferProxy - Transfers tokens on behalf of contracts that have been approved via decentralized governance.
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/// @author Amir Bandeali - <amir@0xProject.com>, Will Warren - <will@0xProject.com>
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contract TokenTransferProxy is Ownable {
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/// @dev Only authorized addresses can invoke functions with this modifier.
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modifier onlyAuthorized {
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require(authorized[msg.sender]);
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_;
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}
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modifier targetAuthorized(address target) {
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require(authorized[target]);
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_;
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}
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modifier targetNotAuthorized(address target) {
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require(!authorized[target]);
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_;
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}
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mapping (address => bool) public authorized;
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address[] public authorities;
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event LogAuthorizedAddressAdded(address indexed target, address indexed caller);
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event LogAuthorizedAddressRemoved(address indexed target, address indexed caller);
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/*
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* Public functions
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*/
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/// @dev Authorizes an address.
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/// @param target Address to authorize.
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function addAuthorizedAddress(address target)
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public
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onlyOwner
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targetNotAuthorized(target)
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{
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authorized[target] = true;
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authorities.push(target);
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LogAuthorizedAddressAdded(target, msg.sender);
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}
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/// @dev Removes authorizion of an address.
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/// @param target Address to remove authorization from.
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function removeAuthorizedAddress(address target)
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public
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onlyOwner
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targetAuthorized(target)
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{
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delete authorized[target];
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for (uint i = 0; i < authorities.length; i++) {
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if (authorities[i] == target) {
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authorities[i] = authorities[authorities.length - 1];
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authorities.length -= 1;
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break;
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}
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}
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LogAuthorizedAddressRemoved(target, msg.sender);
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}
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/// @dev Calls into ERC20 Token contract, invoking transferFrom.
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/// @param token Address of token to transfer.
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/// @param from Address to transfer token from.
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/// @param to Address to transfer token to.
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/// @param value Amount of token to transfer.
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/// @return Success of transfer.
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function transferFrom(
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address token,
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address from,
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address to,
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uint value)
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public
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onlyAuthorized
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returns (bool)
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{
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return Token(token).transferFrom(from, to, value);
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}
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/*
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* Public constant functions
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*/
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/// @dev Gets all authorized addresses.
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/// @return Array of authorized addresses.
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function getAuthorizedAddresses()
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public
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constant
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returns (address[])
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{
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return authorities;
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}
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}
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