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-rw-r--r--packages/order-utils/src/asset_proxy_utils.ts44
1 files changed, 26 insertions, 18 deletions
diff --git a/packages/order-utils/src/asset_proxy_utils.ts b/packages/order-utils/src/asset_proxy_utils.ts
index ed8832b18..e2b377899 100644
--- a/packages/order-utils/src/asset_proxy_utils.ts
+++ b/packages/order-utils/src/asset_proxy_utils.ts
@@ -1,13 +1,15 @@
import { AssetProxyId, ERC20AssetData, ERC721AssetData } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BigNumber, NULL_BYTES } from '@0xproject/utils';
import BN = require('bn.js');
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
-import { constants } from '../../src/utils/constants';
-
const ERC20_ASSET_DATA_BYTE_LENGTH = 21;
const ERC721_ASSET_DATA_BYTE_LENGTH = 53;
+const ASSET_DATA_ADDRESS_OFFSET = 0;
+const ERC721_ASSET_DATA_TOKEN_ID_OFFSET = 20;
+const ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET = 52;
+const ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET = 84;
export const assetProxyUtils = {
encodeAssetProxyId(assetProxyId: AssetProxyId): Buffer {
@@ -59,7 +61,8 @@ export const assetProxyUtils = {
}`,
);
}
- const encodedAssetProxyId = encodedAssetData.slice(-1);
+ const assetProxyIdOffset = encodedAssetData.byteLength - 1;
+ const encodedAssetProxyId = encodedAssetData.slice(assetProxyIdOffset);
const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
if (assetProxyId !== AssetProxyId.ERC20) {
throw new Error(
@@ -68,8 +71,7 @@ export const assetProxyUtils = {
}), but got ${assetProxyId}`,
);
}
- const addressOffset = ERC20_ASSET_DATA_BYTE_LENGTH - 1;
- const encodedTokenAddress = encodedAssetData.slice(0, addressOffset);
+ const encodedTokenAddress = encodedAssetData.slice(ASSET_DATA_ADDRESS_OFFSET, assetProxyIdOffset);
const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
const erc20AssetData = {
assetProxyId,
@@ -101,11 +103,11 @@ export const assetProxyUtils = {
}`,
);
}
- const addressOffset = 0;
- const tokenIdOffset = 20;
- const receiverDataLengthOffset = 52;
- const receiverDataOffset = 84;
- const encodedTokenAddress = encodedAssetData.slice(addressOffset, tokenIdOffset);
+
+ const encodedTokenAddress = encodedAssetData.slice(
+ ASSET_DATA_ADDRESS_OFFSET,
+ ERC721_ASSET_DATA_TOKEN_ID_OFFSET,
+ );
const proxyIdOffset = encodedAssetData.byteLength - 1;
const encodedAssetProxyId = encodedAssetData.slice(-1);
const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
@@ -117,14 +119,20 @@ export const assetProxyUtils = {
);
}
const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
- const encodedTokenId = encodedAssetData.slice(tokenIdOffset, receiverDataLengthOffset);
+ const encodedTokenId = encodedAssetData.slice(
+ ERC721_ASSET_DATA_TOKEN_ID_OFFSET,
+ ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET,
+ );
const tokenId = assetProxyUtils.decodeUint256(encodedTokenId);
- let receiverData = constants.NULL_BYTE;
- const lengthUpToReceiverDataLength = receiverDataLengthOffset + 1;
+ let receiverData = NULL_BYTES;
+ const lengthUpToReceiverDataLength = ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET + 1;
if (encodedAssetData.byteLength > lengthUpToReceiverDataLength) {
- const encodedReceiverDataLength = encodedAssetData.slice(receiverDataLengthOffset, receiverDataOffset);
+ const encodedReceiverDataLength = encodedAssetData.slice(
+ ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET,
+ ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET,
+ );
const receiverDataLength = assetProxyUtils.decodeUint256(encodedReceiverDataLength);
- const lengthUpToReceiverData = receiverDataOffset + 1;
+ const lengthUpToReceiverData = ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET + 1;
const expectedReceiverDataLength = new BigNumber(encodedAssetData.byteLength - lengthUpToReceiverData);
if (!receiverDataLength.equals(expectedReceiverDataLength)) {
throw new Error(
@@ -132,8 +140,8 @@ export const assetProxyUtils = {
);
}
const encodedReceiverData = encodedAssetData.slice(
- receiverDataOffset,
- receiverDataOffset + receiverDataLength.toNumber(),
+ ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET,
+ ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET + receiverDataLength.toNumber(),
);
receiverData = ethUtil.bufferToHex(encodedReceiverData);
}