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import { BigNumber } from '@0xproject/utils';
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, encodedMetadata: { value: string }) {
encodedMetadata.value += zeroPad(new BigNumber(assetProxyId).toString(16), 2);
}
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 encodeERC20ProxyMetadata_V1(tokenAddress: string) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC20_V1, encodedMetadata);
encodeAddress(tokenAddress, 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;
}
export function encodeERC20ProxyMetadata(tokenAddress: string) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC20, encodedMetadata);
encodeAddress(tokenAddress, 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;
}
export function encodeERC721ProxyMetadata(tokenAddress: string, tokenId: BigNumber) {
// Encode metadata
const encodedMetadata = { value: '0x' };
encodeAssetProxyId(AssetProxyId.ERC721, encodedMetadata);
encodeAddress(tokenAddress, encodedMetadata);
encodeUint256(tokenId, 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;
}
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