import { assert } from '@0xproject/assert';
import {
ContractWrappers,
EtherTokenWrapper,
ExchangeWrapper,
TokenRegistryWrapper,
TokenTransferProxyWrapper,
TokenWrapper,
ZeroExContractConfig,
} from '@0xproject/contract-wrappers';
import {
generatePseudoRandomSalt,
getOrderHashHex,
isValidOrderHash,
isValidSignature,
signOrderHashAsync,
} from '@0xproject/order-utils';
import { OrderWatcher, OrderWatcherConfig } from '@0xproject/order-watcher';
import { ECSignature, Order, Provider, SignedOrder, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import * as _ from 'lodash';
import { constants } from './utils/constants';
/**
* The ZeroEx class is the single entry-point into the 0x.js library. It contains all of the library's functionality
* and all calls to the library should be made through a ZeroEx instance.
*/
export class ZeroEx {
/**
* When creating an order without a specified taker or feeRecipient you must supply the Solidity
* address null type (as opposed to Javascripts `null`, `undefined` or empty string). We expose
* this constant for your convenience.
*/
public static NULL_ADDRESS = constants.NULL_ADDRESS;
/**
* An instance of the ExchangeWrapper class containing methods for interacting with the 0x Exchange smart contract.
*/
public exchange: ExchangeWrapper;
/**
* An instance of the TokenRegistryWrapper class containing methods for interacting with the 0x
* TokenRegistry smart contract.
*/
public tokenRegistry: TokenRegistryWrapper;
/**
* An instance of the TokenWrapper class containing methods for interacting with any ERC20 token smart contract.
*/
public token: TokenWrapper;
/**
* An instance of the EtherTokenWrapper class containing methods for interacting with the
* wrapped ETH ERC20 token smart contract.
*/
public etherToken: EtherTokenWrapper;
/**
* An instance of the TokenTransferProxyWrapper class containing methods for interacting with the
* tokenTransferProxy smart contract.
*/
public proxy: TokenTransferProxyWrapper;
private _contractWrappers: ContractWrappers;
/**
* Generates a pseudo-random 256-bit salt.
* The salt can be included in a 0x order, ensuring that the order generates a unique orderHash
* and will not collide with other outstanding orders that are identical in all other parameters.
* @return A pseudo-random 256-bit number that can be used as a salt.
*/
public static generatePseudoRandomSalt(): BigNumber {
return generatePseudoRandomSalt();
}
/**
* Verifies that the elliptic curve signature `signature` was generated
* by signing `data` with the private key corresponding to the `signerAddress` address.
* @param data The hex encoded data signed by the supplied signature.
* @param signature An object containing the elliptic curve signature parameters.
* @param signerAddress The hex encoded address that signed the data, producing the supplied signature.
* @return Whether the signature is valid for the supplied signerAddress and data.
*/
public static isValidSignature(data: string, signature: ECSignature, signerAddress: string): boolean {
return isValidSignature(data, signature, signerAddress);
}
/**
* Computes the orderHash for a supplied order.
* @param order An object that conforms to the Order or SignedOrder interface definitions.
* @return The resulting orderHash from hashing the supplied order.
*/
public static getOrderHashHex(order: Order | SignedOrder): string {
return getOrderHashHex(order);
}
/**
* Checks if the supplied hex encoded order hash is valid.
* Note: Valid means it has the expected format, not that an order with the orderHash exists.
* Use this method when processing orderHashes submitted as user input.
* @param orderHash Hex encoded orderHash.
* @return Whether the supplied orderHash has the expected format.
*/
public static isValidOrderHash(orderHash: string): boolean {
return isValidOrderHash(orderHash);
}
/**
* A unit amount is defined as the amount of a token above the specified decimal places (integer part).
* E.g: If a currency has 18 decimal places, 1e18 or one quintillion of the currency is equivalent
* to 1 unit.
* @param amount The amount in baseUnits that you would like converted to units.
* @param decimals The number of decimal places the unit amount has.
* @return The amount in units.
*/
public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
assert.isValidBaseUnitAmount('amount', amount);
assert.isNumber('decimals', decimals);
const unitAmount = Web3Wrapper.toUnitAmount(amount, decimals);
return unitAmount;
}
/**
* A baseUnit is defined as the smallest denomination of a token. An amount expressed in baseUnits
* is the amount expressed in the smallest denomination.
* E.g: 1 unit of a token with 18 decimal places is expressed in baseUnits as 1000000000000000000
* @param amount The amount of units that you would like converted to baseUnits.
* @param decimals The number of decimal places the unit amount has.
* @return The amount in baseUnits.
*/
public static toBaseUnitAmount(amount: BigNumber, decimals: number): BigNumber {
assert.isBigNumber('amount', amount);
assert.isNumber('decimals', decimals);
const baseUnitAmount = Web3Wrapper.toBaseUnitAmount(amount, decimals);
return baseUnitAmount;
}
/**
* Instantiates a new ZeroEx instance that provides the public interface to the 0x.js library.
* @param provider The Provider instance you would like the 0x.js library to use for interacting with
* the Ethereum network.
* @param config The configuration object. Look up the type for the description.
* @return An instance of the 0x.js ZeroEx class.
*/
constructor(provider: Provider, config: ZeroExContractConfig) {
assert.isWeb3Provider('provider', provider);
this._contractWrappers = new ContractWrappers(provider, config);
this.proxy = this._contractWrappers.proxy;
this.token = this._contractWrappers.token;
this.exchange = this._contractWrappers.exchange;
this.tokenRegistry = this._contractWrappers.tokenRegistry;
this.etherToken = this._contractWrappers.etherToken;
}
/**
* Sets a new web3 provider for 0x.js. Updating the provider will stop all
* subscriptions so you will need to re-subscribe to all events relevant to your app after this call.
* @param provider The Web3Provider you would like the 0x.js library to use from now on.
* @param networkId The id of the network your provider is connected to
*/
public setProvider(provider: Provider, networkId: number): void {
this._contractWrappers.setProvider(provider, networkId);
}
/**
* Get the provider instance currently used by 0x.js
* @return Web3 provider instance
*/
public getProvider(): Provider {
return this._contractWrappers.getProvider();
}
/**
* Get user Ethereum addresses available through the supplied web3 provider available for sending transactions.
* @return An array of available user Ethereum addresses.
*/
public async getAvailableAddressesAsync(): Promise<string[]> {
// Hack: Get Web3Wrapper from ZeroExContract
const web3Wrapper = (this._contractWrappers as any)._web3Wrapper;
const availableAddresses = await web3Wrapper.getAvailableAddressesAsync();
return availableAddresses;
}
/**
* Signs an orderHash and returns it's elliptic curve signature.
* This method currently supports TestRPC, Geth and Parity above and below V1.6.6
* @param orderHash Hex encoded orderHash to sign.
* @param signerAddress The hex encoded Ethereum address you wish to sign it with. This address
* must be available via the Provider supplied to 0x.js.
* @param shouldAddPersonalMessagePrefix Some signers add the personal message prefix `\x19Ethereum Signed Message`
* themselves (e.g Parity Signer, Ledger, TestRPC) and others expect it to already be done by the client
* (e.g Metamask). Depending on which signer this request is going to, decide on whether to add the prefix
* before sending the request.
* @return An object containing the Elliptic curve signature parameters generated by signing the orderHash.
*/
public async signOrderHashAsync(
orderHash: string,
signerAddress: string,
shouldAddPersonalMessagePrefix: boolean,
): Promise<ECSignature> {
return signOrderHashAsync(
this._contractWrappers.getProvider(),
orderHash,
signerAddress,
shouldAddPersonalMessagePrefix,
);
}
/**
* Waits for a transaction to be mined and returns the transaction receipt.
* @param txHash Transaction hash
* @param pollingIntervalMs How often (in ms) should we check if the transaction is mined.
* @param timeoutMs How long (in ms) to poll for transaction mined until aborting.
* @return Transaction receipt with decoded log args.
*/
public async awaitTransactionMinedAsync(
txHash: string,
pollingIntervalMs = 1000,
timeoutMs?: number,
): Promise<TransactionReceiptWithDecodedLogs> {
// Hack: Get Web3Wrapper from ZeroExContract
const web3Wrapper = (this._contractWrappers as any)._web3Wrapper;
const transactionReceiptWithDecodedLogs = await web3Wrapper.awaitTransactionMinedAsync(
txHash,
pollingIntervalMs,
timeoutMs,
);
return transactionReceiptWithDecodedLogs;
}
/**
* Instantiates and returns a new OrderWatcher instance.
* Defaults to watching the pending state.
* @param config The configuration object. Look up the type for the description.
* @return An instance of the 0x.js OrderWatcher class.
*/
public async createOrderWatcherAsync(config?: OrderWatcherConfig) {
// Hack: Get Web3Wrapper from ZeroExContract
const web3Wrapper = (this._contractWrappers as any)._web3Wrapper;
const networkId = web3Wrapper.getNetworkIdAsync();
const provider = this._contractWrappers.getProvider();
return new OrderWatcher(provider, networkId, config);
}
}
