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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;
+
+import "../src/interfaces/IValidator.sol";
+
+
+contract Validator is
+ IValidator
+{
+
+ // The single valid signer for this wallet.
+ // solhint-disable-next-line var-name-mixedcase
+ address internal VALID_SIGNER;
+
+ /// @dev constructs a new `Validator` with a single valid signer.
+ /// @param validSigner The sole, valid signer.
+ constructor (address validSigner) public {
+ VALID_SIGNER = validSigner;
+ }
+
+ /// @dev Verifies that a signature is valid. `signer` must match `VALID_SIGNER`.
+ /// @param hash Message hash that is signed.
+ /// @param signerAddress Address that should have signed the given hash.
+ /// @param signature Proof of signing.
+ /// @return Validity of signature.
+ // solhint-disable no-unused-vars
+ function isValidSignature(
+ bytes32 hash,
+ address signerAddress,
+ bytes signature
+ )
+ external
+ view
+ returns (bool isValid)
+ {
+ return (signerAddress == VALID_SIGNER);
+ }
+ // solhint-enable no-unused-vars
+}