10 files changed, 4 insertions, 382 deletions
diff --git a/contracts/core/README.md b/contracts/core/README.md
index 8371d8041..922ea21ad 100644
--- a/contracts/core/README.md
+++ b/contracts/core/README.md
@@ -10,8 +10,6 @@ Contracts that make up and interact with version 2.0.0 of the protocol can be fo
     *   This directory contains the contracts that make up version 2.0.0. A full specification can be found [here](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md).
 *   [extensions](./contracts/extensions)
     *   This directory contains contracts that interact with the 2.0.0 contracts and will be used in production, such as the [Forwarder](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/forwarder-specification.md) contract.
-*   [examples](./contracts/examples)
-    *   This directory contains example implementations of contracts that interact with the protocol but are _not_ intended for use in production. Examples include [filter](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#filter-contracts) contracts, a [Wallet](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#wallet) contract, and a [Validator](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/v2-specification.md#validator) contract, among others.
 *   [test](./contracts/test)
     *   This directory contains mocks and other contracts that are used solely for testing contracts within the other directories.
 
diff --git a/contracts/core/compiler.json b/contracts/core/compiler.json
index 606208e49..3f869024c 100644
--- a/contracts/core/compiler.json
+++ b/contracts/core/compiler.json
@@ -24,7 +24,6 @@
         "ERC20Proxy",
         "ERC721Proxy",
         "Exchange",
-        "ExchangeWrapper",
         "Forwarder",
         "MixinAuthorizable",
         "MultiAssetProxy",
@@ -33,9 +32,6 @@
         "TestAssetProxyDispatcher",
         "TestExchangeInternals",
         "TestSignatureValidator",
-        "TestStaticCallReceiver",
-        "Validator",
-        "Wallet",
-        "Whitelist"
+        "TestStaticCallReceiver"
     ]
 }
diff --git a/contracts/core/contracts/examples/ExchangeWrapper/ExchangeWrapper.sol b/contracts/core/contracts/examples/ExchangeWrapper/ExchangeWrapper.sol
deleted file mode 100644
index d98136922..000000000
--- a/contracts/core/contracts/examples/ExchangeWrapper/ExchangeWrapper.sol
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
-
-  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 "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-
-
-contract ExchangeWrapper {
-
-    // Exchange contract.
-    // solhint-disable-next-line var-name-mixedcase
-    IExchange internal EXCHANGE;
-
-    constructor (address _exchange)
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-    }
-
-    /// @dev Cancels all orders created by sender with a salt less than or equal to the targetOrderEpoch
-    ///      and senderAddress equal to this contract.
-    /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.
-    /// @param salt Arbitrary value to gaurantee uniqueness of 0x transaction hash.
-    /// @param makerSignature Proof that maker wishes to call this function with given params.
-    function cancelOrdersUpTo(
-        uint256 targetOrderEpoch,
-        uint256 salt,
-        bytes makerSignature
-    )
-        external
-    {
-        address makerAddress = msg.sender;
-
-        // Encode arguments into byte array.
-        bytes memory data = abi.encodeWithSelector(
-            EXCHANGE.cancelOrdersUpTo.selector,
-            targetOrderEpoch
-        );
-
-        // Call `cancelOrdersUpTo` via `executeTransaction`.
-        EXCHANGE.executeTransaction(
-            salt,
-            makerAddress,
-            data,
-            makerSignature
-        );
-    }
-
-    /// @dev Fills an order using `msg.sender` as the taker.
-    /// @param order Order struct containing order specifications.
-    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
-    /// @param salt Arbitrary value to gaurantee uniqueness of 0x transaction hash.
-    /// @param orderSignature Proof that order has been created by maker.
-    /// @param takerSignature Proof that taker wishes to call this function with given params.
-    function fillOrder(
-        LibOrder.Order memory order,
-        uint256 takerAssetFillAmount,
-        uint256 salt,
-        bytes memory orderSignature,
-        bytes memory takerSignature
-    )
-        public
-    {
-        address takerAddress = msg.sender;
-
-        // Encode arguments into byte array.
-        bytes memory data = abi.encodeWithSelector(
-            EXCHANGE.fillOrder.selector,
-            order,
-            takerAssetFillAmount,
-            orderSignature
-        );
-
-        // Call `fillOrder` via `executeTransaction`.
-        EXCHANGE.executeTransaction(
-            salt,
-            takerAddress,
-            data,
-            takerSignature
-        );
-    }
-}
diff --git a/contracts/core/contracts/examples/Validator/Validator.sol b/contracts/core/contracts/examples/Validator/Validator.sol
deleted file mode 100644
index e488a9ca7..000000000
--- a/contracts/core/contracts/examples/Validator/Validator.sol
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
-
-  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 "@0x/contracts-interfaces/contracts/protocol/Exchange/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
-}
diff --git a/contracts/core/contracts/examples/Wallet/Wallet.sol b/contracts/core/contracts/examples/Wallet/Wallet.sol
deleted file mode 100644
index 8edc74eb3..000000000
--- a/contracts/core/contracts/examples/Wallet/Wallet.sol
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
-
-  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 "@0x/contracts-interfaces/contracts/protocol/Exchange/IWallet.sol";
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-
-
-contract Wallet is 
-    IWallet
-{
-    using LibBytes for bytes;
-
-    // The owner of this wallet.
-    // solhint-disable-next-line var-name-mixedcase
-    address internal WALLET_OWNER;
-
-    /// @dev constructs a new `Wallet` with a single owner.
-    /// @param walletOwner The owner of this wallet.
-    constructor (address walletOwner) public {
-        WALLET_OWNER = walletOwner;
-    }
-
-    /// @dev Validates an EIP712 signature.
-    ///      The signer must match the owner of this wallet.
-    /// @param hash Message hash that is signed.
-    /// @param eip712Signature Proof of signing.
-    /// @return Validity of signature.
-    function isValidSignature(
-        bytes32 hash,
-        bytes eip712Signature
-    )
-        external
-        view
-        returns (bool isValid)
-    {
-        require(
-            eip712Signature.length == 65,
-            "LENGTH_65_REQUIRED"
-        );
-
-        uint8 v = uint8(eip712Signature[0]);
-        bytes32 r = eip712Signature.readBytes32(1);
-        bytes32 s = eip712Signature.readBytes32(33);
-        address recoveredAddress = ecrecover(hash, v, r, s);
-        isValid = WALLET_OWNER == recoveredAddress;
-        return isValid;
-    }
-}
diff --git a/contracts/core/contracts/examples/Whitelist/Whitelist.sol b/contracts/core/contracts/examples/Whitelist/Whitelist.sol
deleted file mode 100644
index 2a3d33738..000000000
--- a/contracts/core/contracts/examples/Whitelist/Whitelist.sol
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
-
-  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 "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
-
-
-contract Whitelist is
-    Ownable
-{
-
-    // Mapping of address => whitelist status.
-    mapping (address => bool) public isWhitelisted;
-
-    // Exchange contract.
-    // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-    bytes internal TX_ORIGIN_SIGNATURE;
-    // solhint-enable var-name-mixedcase
-
-    byte constant internal VALIDATOR_SIGNATURE_BYTE = "\x05";
-
-    constructor (address _exchange)
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-        TX_ORIGIN_SIGNATURE = abi.encodePacked(address(this), VALIDATOR_SIGNATURE_BYTE);
-    }
-
-    /// @dev Adds or removes an address from the whitelist.
-    /// @param target Address to add or remove from whitelist.
-    /// @param isApproved Whitelist status to assign to address.
-    function updateWhitelistStatus(
-        address target,
-        bool isApproved
-    )
-        external
-        onlyOwner
-    {
-        isWhitelisted[target] = isApproved;
-    }
-
-    /// @dev Verifies signer is same as signer of current Ethereum transaction.
-    ///      NOTE: This function can currently be used to validate signatures coming from outside of this contract.
-    ///      Extra safety checks can be added for a production contract.
-    /// @param signerAddress Address that should have signed the given hash.
-    /// @param signature Proof of signing.
-    /// @return Validity of order signature.
-    // solhint-disable no-unused-vars
-    function isValidSignature(
-        bytes32 hash,
-        address signerAddress,
-        bytes signature
-    )
-        external
-        view
-        returns (bool isValid)
-    {
-        // solhint-disable-next-line avoid-tx-origin
-        return signerAddress == tx.origin;
-    }
-    // solhint-enable no-unused-vars
-
-    /// @dev Fills an order using `msg.sender` as the taker.
-    ///      The transaction will revert if both the maker and taker are not whitelisted.
-    ///      Orders should specify this contract as the `senderAddress` in order to gaurantee
-    ///      that both maker and taker have been whitelisted.
-    /// @param order Order struct containing order specifications.
-    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
-    /// @param salt Arbitrary value to gaurantee uniqueness of 0x transaction hash.
-    /// @param orderSignature Proof that order has been created by maker.
-    function fillOrderIfWhitelisted(
-        LibOrder.Order memory order,
-        uint256 takerAssetFillAmount,
-        uint256 salt,
-        bytes memory orderSignature
-    )
-        public
-    {
-        address takerAddress = msg.sender;
-
-        // This contract must be the entry point for the transaction.
-        require(
-            // solhint-disable-next-line avoid-tx-origin
-            takerAddress == tx.origin,
-            "INVALID_SENDER"
-        );
-
-        // Check if maker is on the whitelist.
-        require(
-            isWhitelisted[order.makerAddress],
-            "MAKER_NOT_WHITELISTED"
-        );
-
-        // Check if taker is on the whitelist.
-        require(
-            isWhitelisted[takerAddress],
-            "TAKER_NOT_WHITELISTED"
-        );
-
-        // Encode arguments into byte array.
-        bytes memory data = abi.encodeWithSelector(
-            EXCHANGE.fillOrder.selector,
-            order,
-            takerAssetFillAmount,
-            orderSignature
-        );
-
-        // Call `fillOrder` via `executeTransaction`.
-        EXCHANGE.executeTransaction(
-            salt,
-            takerAddress,
-            data,
-            TX_ORIGIN_SIGNATURE
-        );
-    }
-}
diff --git a/contracts/core/package.json b/contracts/core/package.json
index fd844ae16..62547c311 100644
--- a/contracts/core/package.json
+++ b/contracts/core/package.json
@@ -33,7 +33,7 @@
         "lint-contracts": "solhint contracts/**/**/**/**/*.sol"
     },
     "config": {
-        "abis": "generated-artifacts/@(AssetProxyOwner|DutchAuction|ERC20Proxy|ERC721Proxy|Forwarder|Exchange|ExchangeWrapper|MixinAuthorizable|MultiAssetProxy|OrderValidator|TestAssetProxyOwner|TestAssetProxyDispatcher|TestExchangeInternals|TestSignatureValidator|TestStaticCallReceiver|Validator|Wallet|Whitelist).json"
+        "abis": "generated-artifacts/@(AssetProxyOwner|DutchAuction|ERC20Proxy|ERC721Proxy|Forwarder|Exchange|MixinAuthorizable|MultiAssetProxy|OrderValidator|TestAssetProxyOwner|TestAssetProxyDispatcher|TestExchangeInternals|TestStaticCallReceiver).json"
     },
     "repository": {
         "type": "git",
@@ -77,6 +77,7 @@
         "@0x/contracts-multisig": "^1.0.0",
         "@0x/contracts-utils": "^1.0.0",
         "@0x/contracts-tokens": "^1.0.0",
+        "@0x/contracts-examples": "^1.0.0",
         "@0x/contracts-libs": "^1.0.0",
         "@0x/contracts-interfaces": "^1.0.0",
         "@0x/types": "^1.3.0",
diff --git a/contracts/core/src/artifacts/index.ts b/contracts/core/src/artifacts/index.ts
index ac334c173..7b598a6d9 100644
--- a/contracts/core/src/artifacts/index.ts
+++ b/contracts/core/src/artifacts/index.ts
@@ -5,7 +5,6 @@ import * as DutchAuction from '../../generated-artifacts/DutchAuction.json';
 import * as ERC20Proxy from '../../generated-artifacts/ERC20Proxy.json';
 import * as ERC721Proxy from '../../generated-artifacts/ERC721Proxy.json';
 import * as Exchange from '../../generated-artifacts/Exchange.json';
-import * as ExchangeWrapper from '../../generated-artifacts/ExchangeWrapper.json';
 import * as Forwarder from '../../generated-artifacts/Forwarder.json';
 import * as MixinAuthorizable from '../../generated-artifacts/MixinAuthorizable.json';
 import * as MultiAssetProxy from '../../generated-artifacts/MultiAssetProxy.json';
@@ -15,9 +14,6 @@ import * as TestAssetProxyOwner from '../../generated-artifacts/TestAssetProxyOw
 import * as TestExchangeInternals from '../../generated-artifacts/TestExchangeInternals.json';
 import * as TestSignatureValidator from '../../generated-artifacts/TestSignatureValidator.json';
 import * as TestStaticCallReceiver from '../../generated-artifacts/TestStaticCallReceiver.json';
-import * as Validator from '../../generated-artifacts/Validator.json';
-import * as Wallet from '../../generated-artifacts/Wallet.json';
-import * as Whitelist from '../../generated-artifacts/Whitelist.json';
 
 export const artifacts = {
     AssetProxyOwner: AssetProxyOwner as ContractArtifact,
@@ -25,7 +21,6 @@ export const artifacts = {
     ERC20Proxy: ERC20Proxy as ContractArtifact,
     ERC721Proxy: ERC721Proxy as ContractArtifact,
     Exchange: Exchange as ContractArtifact,
-    ExchangeWrapper: ExchangeWrapper as ContractArtifact,
     Forwarder: Forwarder as ContractArtifact,
     MixinAuthorizable: MixinAuthorizable as ContractArtifact,
     MultiAssetProxy: MultiAssetProxy as ContractArtifact,
@@ -35,7 +30,4 @@ export const artifacts = {
     TestExchangeInternals: TestExchangeInternals as ContractArtifact,
     TestSignatureValidator: TestSignatureValidator as ContractArtifact,
     TestStaticCallReceiver: TestStaticCallReceiver as ContractArtifact,
-    Validator: Validator as ContractArtifact,
-    Wallet: Wallet as ContractArtifact,
-    Whitelist: Whitelist as ContractArtifact,
 };
diff --git a/contracts/core/src/wrappers/index.ts b/contracts/core/src/wrappers/index.ts
index ff26a171e..ce3714ed7 100644
--- a/contracts/core/src/wrappers/index.ts
+++ b/contracts/core/src/wrappers/index.ts
@@ -3,7 +3,6 @@ export * from '../../generated-wrappers/dutch_auction';
 export * from '../../generated-wrappers/erc20_proxy';
 export * from '../../generated-wrappers/erc721_proxy';
 export * from '../../generated-wrappers/exchange';
-export * from '../../generated-wrappers/exchange_wrapper';
 export * from '../../generated-wrappers/forwarder';
 export * from '../../generated-wrappers/mixin_authorizable';
 export * from '../../generated-wrappers/order_validator';
@@ -12,6 +11,3 @@ export * from '../../generated-wrappers/test_asset_proxy_owner';
 export * from '../../generated-wrappers/test_exchange_internals';
 export * from '../../generated-wrappers/test_signature_validator';
 export * from '../../generated-wrappers/test_static_call_receiver';
-export * from '../../generated-wrappers/validator';
-export * from '../../generated-wrappers/wallet';
-export * from '../../generated-wrappers/whitelist';
diff --git a/contracts/core/tsconfig.json b/contracts/core/tsconfig.json
index ea493cbb8..d6adef2c5 100644
--- a/contracts/core/tsconfig.json
+++ b/contracts/core/tsconfig.json
@@ -12,7 +12,6 @@
         "./generated-artifacts/ERC20Proxy.json",
         "./generated-artifacts/ERC721Proxy.json",
         "./generated-artifacts/Exchange.json",
-        "./generated-artifacts/ExchangeWrapper.json",
         "./generated-artifacts/Forwarder.json",
         "./generated-artifacts/MixinAuthorizable.json",
         "./generated-artifacts/MultiAssetProxy.json",
@@ -21,10 +20,7 @@
         "./generated-artifacts/TestAssetProxyOwner.json",
         "./generated-artifacts/TestExchangeInternals.json",
         "./generated-artifacts/TestSignatureValidator.json",
-        "./generated-artifacts/TestStaticCallReceiver.json",
-        "./generated-artifacts/Validator.json",
-        "./generated-artifacts/Wallet.json",
-        "./generated-artifacts/Whitelist.json"
+        "./generated-artifacts/TestStaticCallReceiver.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]
 }