import { assert } from '@0xproject/assert'; import { ContractWrappers, EtherTokenWrapper, ExchangeWrapper, TokenRegistryWrapper, TokenTransferProxyWrapper, TokenWrapper, ContractWrappersConfig, } 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: ContractWrappersConfig) { 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 { // Hack: Get Web3Wrapper from ZeroExContract const web3Wrapper: 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 { 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 { // Hack: Get Web3Wrapper from ZeroExContract const web3Wrapper: 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): Promise { // Hack: Get Web3Wrapper from ZeroExContract const web3Wrapper: Web3Wrapper = (this._contractWrappers as any)._web3Wrapper; const networkId = await web3Wrapper.getNetworkIdAsync(); const provider = this._contractWrappers.getProvider(); const orderWatcher = new OrderWatcher(provider, networkId, config); return orderWatcher; } }