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Update AssetProxyUtils

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This commit is contained in:
Remco Bloemen
2018-06-22 09:51:59 +02:00
committed by Amir Bandeali
parent b7b0185baf
commit 08d22d2f3c
1 changed files with 41 additions and 90 deletions
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131
packages/order-utils/src/asset_proxy_utils.ts
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@@ -1,8 +1,7 @@
import { AssetProxyId, ERC20AssetData, ERC721AssetData } from '@0xproject/types';
import { BigNumber, NULL_BYTES } from '@0xproject/utils';
import { BigNumber } from '@0xproject/utils';
import BN = require('bn.js');
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
const ERC20_ASSET_DATA_BYTE_LENGTH = 36;
const ERC721_ASSET_DATA_MINIMUM_BYTE_LENGTH = 53;
@@ -11,6 +10,13 @@ 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;
// TODO: Push upstream to DefinitelyTyped
interface EthAbi {
simpleEncode(signature: string, ...args: any[]): Buffer;
rawDecode(signature: string[], data: Buffer): any[];
}
const ethAbi = require('ethereumjs-abi') as EthAbi;
export const assetProxyUtils = {
encodeAssetProxyId(assetProxyId: AssetProxyId): Buffer {
return ethUtil.toBuffer(assetProxyId);
@@ -55,123 +61,68 @@ export const assetProxyUtils = {
return value;
},
encodeERC20AssetData(tokenAddress: string): string {
const encodedAssetProxyId = assetProxyUtils.encodeAssetProxyId(AssetProxyId.ERC20);
const encodedAddress = assetProxyUtils.encodeAddress(tokenAddress);
const encodedAssetData = Buffer.concat([encodedAssetProxyId, encodedAddress]);
const encodedAssetDataHex = ethUtil.bufferToHex(encodedAssetData);
return encodedAssetDataHex;
return ethUtil.bufferToHex(ethAbi.simpleEncode(
'ERC20Token(address)',
tokenAddress,
));
},
decodeERC20AssetData(proxyData: string): ERC20AssetData {
const encodedAssetData = ethUtil.toBuffer(proxyData);
if (encodedAssetData.byteLength !== ERC20_ASSET_DATA_BYTE_LENGTH) {
decodeERC20AssetData(assetData: string): ERC20AssetData {
const data = ethUtil.toBuffer(assetData);
if (data.byteLength < ERC20_ASSET_DATA_BYTE_LENGTH) {
throw new Error(
`Could not decode ERC20 Proxy Data. Expected length of encoded data to be ${ERC20_ASSET_DATA_BYTE_LENGTH}. Got ${
encodedAssetData.byteLength
}`,
`Could not decode ERC20 Proxy Data. Expected length of encoded data to be at least ${ERC20_ASSET_DATA_BYTE_LENGTH}. Got ${data.byteLength}`,
);
}
const encodedAssetProxyId = encodedAssetData.slice(0, 4);
const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
const assetProxyId = ethUtil.bufferToHex(data.slice(0, 4));
if (assetProxyId !== AssetProxyId.ERC20) {
throw new Error(
`Could not decode ERC20 Proxy Data. Expected Asset Proxy Id to be ERC20 (${
AssetProxyId.ERC20
}), but got ${assetProxyId}`,
`Could not decode ERC20 Proxy Data. Expected Asset Proxy Id to be ERC20 (${AssetProxyId.ERC20}), but got ${assetProxyId}`,
);
}
const encodedTokenAddress = encodedAssetData.slice(16, 20);
const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
const erc20AssetData = {
const [tokenAddress] = ethAbi.rawDecode(['address'], data.slice(4));
return {
assetProxyId,
tokenAddress,
tokenAddress: ethUtil.addHexPrefix(tokenAddress),
};
return erc20AssetData;
},
encodeERC721AssetData(tokenAddress: string, tokenId: BigNumber, receiverData?: string): string {
const encodedAssetProxyId = assetProxyUtils.encodeAssetProxyId(AssetProxyId.ERC721);
const encodedAddress = assetProxyUtils.encodeAddress(tokenAddress);
const encodedTokenId = assetProxyUtils.encodeUint256(tokenId);
let encodedAssetData = Buffer.concat([encodedAddress, encodedTokenId]);
if (!_.isUndefined(receiverData)) {
const encodedReceiverData = ethUtil.toBuffer(receiverData);
const receiverDataLength = new BigNumber(encodedReceiverData.byteLength);
const encodedReceiverDataLength = assetProxyUtils.encodeUint256(receiverDataLength);
encodedAssetData = Buffer.concat([encodedAssetData, encodedReceiverDataLength, encodedReceiverData]);
}
encodedAssetData = Buffer.concat([encodedAssetProxyId, encodedAssetData]);
const encodedAssetDataHex = ethUtil.bufferToHex(encodedAssetData);
return encodedAssetDataHex;
// TODO: Pass `tokendId` as a BigNumber.
return ethUtil.bufferToHex(ethAbi.simpleEncode(
'ERC721Token(address,uint256,bytes)',
tokenAddress,
tokenId.toString(16),
ethUtil.toBuffer(receiverData || '0x'),
));
},
decodeERC721AssetData(assetData: string): ERC721AssetData {
const encodedAssetData = ethUtil.toBuffer(assetData);
if (encodedAssetData.byteLength < ERC721_ASSET_DATA_MINIMUM_BYTE_LENGTH) {
const data = ethUtil.toBuffer(assetData);
if (data.byteLength < ERC721_ASSET_DATA_MINIMUM_BYTE_LENGTH) {
throw new Error(
`Could not decode ERC20 Proxy Data. Expected length of encoded data to be at least ${ERC721_ASSET_DATA_MINIMUM_BYTE_LENGTH}. Got ${
encodedAssetData.byteLength
}`,
`Could not decode ERC721 Asset Data. Expected length of encoded data to be at least ${ERC721_ASSET_DATA_MINIMUM_BYTE_LENGTH}. Got ${data.byteLength}`,
);
}
console.log(rawDecode);
//const result = ethAbi.rawDecode(['address', 'uint256', 'bytes'], encodedAssetData.slice(4));
//console.log(result);
const encodedTokenAddress = encodedAssetData.slice(
ASSET_DATA_ADDRESS_OFFSET,
ERC721_ASSET_DATA_TOKEN_ID_OFFSET,
);
const encodedAssetProxyId = encodedAssetData.slice(0, 4);
const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
const assetProxyId = ethUtil.bufferToHex(data.slice(0, 4));
if (assetProxyId !== AssetProxyId.ERC721) {
throw new Error(
`Could not decode ERC721 Proxy Data. Expected Asset Proxy Id to be ERC721 (${
AssetProxyId.ERC721
}), but got ${assetProxyId}`,
`Could not decode ERC721 Asset Data. Expected Asset Proxy Id to be ERC721 (${AssetProxyId.ERC721}), but got ${assetProxyId}`,
);
}
const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
const encodedTokenId = encodedAssetData.slice(
ERC721_ASSET_DATA_TOKEN_ID_OFFSET,
ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET,
const [tokenAddress, tokenId, receiverData] = ethAbi.rawDecode(
['address', 'uint256', 'bytes'],
data.slice(4),
);
const tokenId = assetProxyUtils.decodeUint256(encodedTokenId);
let receiverData = NULL_BYTES;
const lengthUpToReceiverDataLength = ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET + 1;
if (encodedAssetData.byteLength > lengthUpToReceiverDataLength) {
const encodedReceiverDataLength = encodedAssetData.slice(
ERC721_ASSET_DATA_RECEIVER_DATA_LENGTH_OFFSET,
ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET,
);
const receiverDataLength = assetProxyUtils.decodeUint256(encodedReceiverDataLength);
const lengthUpToReceiverData = ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET + 1;
const expectedReceiverDataLength = new BigNumber(encodedAssetData.byteLength - lengthUpToReceiverData);
if (!receiverDataLength.equals(expectedReceiverDataLength)) {
throw new Error(
`Data length (${receiverDataLength}) does not match actual length of data (${expectedReceiverDataLength})`,
);
}
const encodedReceiverData = encodedAssetData.slice(
ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET,
receiverDataLength.add(ERC721_ASSET_DATA_RECEIVER_DATA_OFFSET).toNumber(),
);
receiverData = ethUtil.bufferToHex(encodedReceiverData);
}
const erc721AssetData: ERC721AssetData = {
return {
assetProxyId,
tokenAddress,
tokenId,
receiverData,
tokenAddress: ethUtil.addHexPrefix(tokenAddress),
tokenId: new BigNumber(tokenId.toString()),
receiverData: ethUtil.bufferToHex(receiverData),
};
return erc721AssetData;
},
decodeAssetDataId(assetData: string): AssetProxyId {
const encodedAssetData = ethUtil.toBuffer(assetData);
if (encodedAssetData.byteLength < 4) {
throw new Error(
`Could not decode Proxy Data. Expected length of encoded data to be at least 4. Got ${
encodedAssetData.byteLength
}`,
`Could not decode Proxy Data. Expected length of encoded data to be at least 4. Got ${encodedAssetData.byteLength}`,
);
}
const encodedAssetProxyId = encodedAssetData.slice(0, 4);