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diff --git a/packages/contracts/src/2.0.0/protocol/AssetProxy/MixinAuthorizable.sol b/packages/contracts/src/2.0.0/protocol/AssetProxy/MixinAuthorizable.sol
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+/*
+
+ Copyright 2018 ZeroEx Intl.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+*/
+
+pragma solidity ^0.4.24;
+pragma experimental ABIEncoderV2;
+
+import "../../utils/Ownable/Ownable.sol";
+import "./mixins/MAuthorizable.sol";
+
+contract MixinAuthorizable is
+ Ownable,
+ MAuthorizable
+{
+
+ /// @dev Only authorized addresses can invoke functions with this modifier.
+ modifier onlyAuthorized {
+ require(
+ authorized[msg.sender],
+ "SENDER_NOT_AUTHORIZED"
+ );
+ _;
+ }
+
+ mapping (address => bool) public authorized;
+ address[] public authorities;
+
+ /// @dev Authorizes an address.
+ /// @param target Address to authorize.
+ function addAuthorizedAddress(address target)
+ external
+ onlyOwner
+ {
+ require(
+ !authorized[target],
+ "TARGET_ALREADY_AUTHORIZED"
+ );
+
+ authorized[target] = true;
+ authorities.push(target);
+ emit AuthorizedAddressAdded(target, msg.sender);
+ }
+
+ /// @dev Removes authorizion of an address.
+ /// @param target Address to remove authorization from.
+ function removeAuthorizedAddress(address target)
+ external
+ onlyOwner
+ {
+ require(
+ authorized[target],
+ "TARGET_NOT_AUTHORIZED"
+ );
+
+ delete authorized[target];
+ for (uint256 i = 0; i < authorities.length; i++) {
+ if (authorities[i] == target) {
+ authorities[i] = authorities[authorities.length - 1];
+ authorities.length -= 1;
+ break;
+ }
+ }
+ emit AuthorizedAddressRemoved(target, msg.sender);
+ }
+
+ /// @dev Removes authorizion of an address.
+ /// @param target Address to remove authorization from.
+ /// @param index Index of target in authorities array.
+ function removeAuthorizedAddressAtIndex(
+ address target,
+ uint256 index
+ )
+ external
+ onlyOwner
+ {
+ require(
+ authorized[target],
+ "TARGET_NOT_AUTHORIZED"
+ );
+ require(
+ index < authorities.length,
+ "INDEX_OUT_OF_BOUNDS"
+ );
+ require(
+ authorities[index] == target,
+ "AUTHORIZED_ADDRESS_MISMATCH"
+ );
+
+ delete authorized[target];
+ authorities[index] = authorities[authorities.length - 1];
+ authorities.length -= 1;
+ emit AuthorizedAddressRemoved(target, msg.sender);
+ }
+
+ /// @dev Gets all authorized addresses.
+ /// @return Array of authorized addresses.
+ function getAuthorizedAddresses()
+ external
+ view
+ returns (address[] memory)
+ {
+ return authorities;
+ }
+}