MaximumGasPrice contract

contracts/extensions/contracts/src/MaximumGasPrice.sol

@@ -0,0 +1,52 @@
+/*
+
+  Copyright 2019 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 ^0.5.16;
+pragma experimental ABIEncoderV2;
+
+
+contract MaximumGasPrice {
+    // 20 Gwei
+    uint256 constant private DEFAULT_MAX_GAS_PRICE = 20 * (10 ** 9);
+
+    /// @dev Checks that the current transaction's gas price is less than
+    ///      the default maximum value of 20 Gwei.
+    function checkGasPrice()
+        external
+        view
+    {
+        require(
+            tx.gasprice <= DEFAULT_MAX_GAS_PRICE,
+            "MaximumGasPrice/GAS_PRICE_EXCEEDS_20_GWEI"
+        );
+    }
+
+    /// @dev Checks that the current transaction's gas price is less than
+    ///      the specified maximum value.
+    /// @param data Encodes the maximum gas price.
+    function checkGasPrice(bytes calldata data)
+        external
+        view
+    {
+        (uint256 maxGasPrice) = abi.decode(data, (uint256));
+        require(
+            tx.gasprice <= maxGasPrice,
+            "MaximumGasPrice/GAS_PRICE_EXCEEDS_MAXIMUM"
+        );
+    }
+}

contracts/extensions/package.json

@@ -38,7 +38,7 @@
         "docs:json": "typedoc --excludePrivate --excludeExternals --excludeProtected --ignoreCompilerErrors --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
     "config": {
-        "abis": "./test/generated-artifacts/@(LibAssetDataTransfer|LibAssetDataTransferRichErrors|LibWethUtilsRichErrors|MixinWethUtils).json",
+        "abis": "./test/generated-artifacts/@(LibAssetDataTransfer|LibAssetDataTransferRichErrors|LibWethUtilsRichErrors|MaximumGasPrice|MixinWethUtils).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {

contracts/extensions/src/artifacts.ts

@@ -8,9 +8,11 @@ import { ContractArtifact } from 'ethereum-types';
 import * as LibAssetDataTransfer from '../generated-artifacts/LibAssetDataTransfer.json';
 import * as LibAssetDataTransferRichErrors from '../generated-artifacts/LibAssetDataTransferRichErrors.json';
 import * as LibWethUtilsRichErrors from '../generated-artifacts/LibWethUtilsRichErrors.json';
+import * as MaximumGasPrice from '../generated-artifacts/MaximumGasPrice.json';
 import * as MixinWethUtils from '../generated-artifacts/MixinWethUtils.json';
 export const artifacts = {
     LibAssetDataTransfer: LibAssetDataTransfer as ContractArtifact,
+    MaximumGasPrice: MaximumGasPrice as ContractArtifact,
     MixinWethUtils: MixinWethUtils as ContractArtifact,
     LibAssetDataTransferRichErrors: LibAssetDataTransferRichErrors as ContractArtifact,
     LibWethUtilsRichErrors: LibWethUtilsRichErrors as ContractArtifact,

contracts/extensions/src/wrappers.ts

@@ -6,4 +6,5 @@
 export * from '../generated-wrappers/lib_asset_data_transfer';
 export * from '../generated-wrappers/lib_asset_data_transfer_rich_errors';
 export * from '../generated-wrappers/lib_weth_utils_rich_errors';
+export * from '../generated-wrappers/maximum_gas_price';
 export * from '../generated-wrappers/mixin_weth_utils';

contracts/extensions/test/artifacts.ts

@@ -8,9 +8,11 @@ import { ContractArtifact } from 'ethereum-types';
 import * as LibAssetDataTransfer from '../test/generated-artifacts/LibAssetDataTransfer.json';
 import * as LibAssetDataTransferRichErrors from '../test/generated-artifacts/LibAssetDataTransferRichErrors.json';
 import * as LibWethUtilsRichErrors from '../test/generated-artifacts/LibWethUtilsRichErrors.json';
+import * as MaximumGasPrice from '../test/generated-artifacts/MaximumGasPrice.json';
 import * as MixinWethUtils from '../test/generated-artifacts/MixinWethUtils.json';
 export const artifacts = {
     LibAssetDataTransfer: LibAssetDataTransfer as ContractArtifact,
+    MaximumGasPrice: MaximumGasPrice as ContractArtifact,
     MixinWethUtils: MixinWethUtils as ContractArtifact,
     LibAssetDataTransferRichErrors: LibAssetDataTransferRichErrors as ContractArtifact,
     LibWethUtilsRichErrors: LibWethUtilsRichErrors as ContractArtifact,

contracts/extensions/test/wrappers.ts

@@ -6,4 +6,5 @@
 export * from '../test/generated-wrappers/lib_asset_data_transfer';
 export * from '../test/generated-wrappers/lib_asset_data_transfer_rich_errors';
 export * from '../test/generated-wrappers/lib_weth_utils_rich_errors';
+export * from '../test/generated-wrappers/maximum_gas_price';
 export * from '../test/generated-wrappers/mixin_weth_utils';

contracts/extensions/tsconfig.json

@@ -6,10 +6,12 @@
         "generated-artifacts/LibAssetDataTransfer.json",
         "generated-artifacts/LibAssetDataTransferRichErrors.json",
         "generated-artifacts/LibWethUtilsRichErrors.json",
+        "generated-artifacts/MaximumGasPrice.json",
         "generated-artifacts/MixinWethUtils.json",
         "test/generated-artifacts/LibAssetDataTransfer.json",
         "test/generated-artifacts/LibAssetDataTransferRichErrors.json",
         "test/generated-artifacts/LibWethUtilsRichErrors.json",
+        "test/generated-artifacts/MaximumGasPrice.json",
         "test/generated-artifacts/MixinWethUtils.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]