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ethereum-js for encoding/decoding asset proxy data

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This commit is contained in:
Greg Hysen
2018-04-11 12:21:14 -07:00
committed by Amir Bandeali
parent e7b0c24d9d
commit a0dfdefd16
1 changed files with 32 additions and 41 deletions
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73
packages/contracts/src/utils/asset_proxy_utils.ts
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@@ -1,66 +1,57 @@
import { BigNumber } from '@0xproject/utils';
import BN = require('bn.js');
import ethUtil = require('ethereumjs-util');
import * as Web3 from 'web3';
import { AssetProxyId } from './types';
export function zeroPad(value: string, width: number): string {
return '0'.repeat(width - value.length) + value;
export function encodeAssetProxyId(assetProxyId: AssetProxyId): Buffer {
const formattedAssetProxyId = new BN(assetProxyId);
const encodedAssetProxyId = ethUtil.toUnsigned(formattedAssetProxyId);
return encodedAssetProxyId;
}
export function encodeAssetProxyId(assetProxyId: AssetProxyId, encodedMetadata: { value: string }) {
encodedMetadata.value += zeroPad(new BigNumber(assetProxyId).toString(16), 2);
export function encodeAddress(address: string): Buffer {
if (!ethUtil.isValidAddress(address)) {
throw new Error(`Invalid Address: ${address}`);
}
const encodedAddress = ethUtil.toBuffer(address);
return encodedAddress;
}
export function encodeAddress(address: string, encodedMetadata: { value: string }) {
encodedMetadata.value += zeroPad(address.replace('0x', ''), 40);
}
export function encodeUint256(value: BigNumber, encodedMetadata: { value: string }) {
encodedMetadata.value += zeroPad(value.toString(16), 64);
export function encodeUint256(value: BigNumber): Buffer {
const formattedValue = new BN(value.toString(10));
const encodedValue = ethUtil.toUnsigned(formattedValue);
return encodedValue;
}
export function encodeERC20ProxyMetadata_V1(tokenAddress: string) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC20_V1, encodedMetadata);
encodeAddress(tokenAddress, encodedMetadata);
const encodedAssetProxyId = encodeAssetProxyId(AssetProxyId.ERC20_V1);
const encodedAddress = encodeAddress(tokenAddress);
const encodedMetadata = Buffer.concat([encodedAssetProxyId, encodedAddress]);
const encodedMetadataHex = ethUtil.bufferToHex(encodedMetadata);
// Verify encoding length - '0x' plus 21 bytes of encoded data
if (encodedMetadata.value.length != 44) {
throw Error('Bad encoding length. Expected 44, got ' + encodedMetadata.value.length);
}
// Return encoded metadata
return encodedMetadata.value;
return encodedMetadataHex;
}
export function encodeERC20ProxyMetadata(tokenAddress: string) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC20, encodedMetadata);
encodeAddress(tokenAddress, encodedMetadata);
const encodedAssetProxyId = encodeAssetProxyId(AssetProxyId.ERC20);
const encodedAddress = encodeAddress(tokenAddress);
const encodedMetadata = Buffer.concat([encodedAssetProxyId, encodedAddress]);
const encodedMetadataHex = ethUtil.bufferToHex(encodedMetadata);
// Verify encoding length - '0x' plus 21 bytes of encoded data
if (encodedMetadata.value.length != 44) {
throw Error('Bad encoding length. Expected 44, got ' + encodedMetadata.value.length);
}
// Return encoded metadata
return encodedMetadata.value;
return encodedMetadataHex;
}
export function encodeERC721ProxyMetadata(tokenAddress: string, tokenId: BigNumber) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC721, encodedMetadata);
encodeAddress(tokenAddress, encodedMetadata);
encodeUint256(tokenId, encodedMetadata);
const encodedAssetProxyId = encodeAssetProxyId(AssetProxyId.ERC721);
const encodedAddress = encodeAddress(tokenAddress);
const encodedTokenId = encodeUint256(tokenId);
const encodedMetadata = Buffer.concat([encodedAssetProxyId, encodedAddress, encodedTokenId]);
const encodedMetadataHex = ethUtil.bufferToHex(encodedMetadata);
// Verify encoding length - '0x' plus 53 bytes of encoded data
if (encodedMetadata.value.length != 108) {
throw Error('Bad encoding length. Expected 108, got ' + encodedMetadata.value.length);
}
// Return encoded metadata
return encodedMetadata.value;
return encodedMetadataHex;
}