createCDP.ts

import { BitGo } from 'bitgo';
import * as ethUtil from 'ethereumjs-util';
import { Contract } from '../../src/contract';

const makerProxyRegistry = new Contract('DSProxyFactory'); // there is only 1, so no need for instance

async function sendBitGoTx(): Promise<void> {
    // step 1 - setup your bitgo wallet and deploy your proxy

    const bitGo = new BitGo({ env: 'prod' });
    const baseCoin = bitGo.coin('eth');
    const withdrawAmount = 30 * 1e18; // The amount of dai you want to withdraw (more than $30).
    const depositAmount = 1e18; // Amount of eth you want to deposit
    bitGo.authenticateWithAccessToken({ accessToken: 'access token here' });
    const bitGoWallet = await baseCoin.wallets().get({ id: 'wallet id here' });
    const walletPassphrase = 'password';


    // First we need to deploy a proxy contract that will simplify adding our DAI to the DSR
    // Note this step only needs to be done once per wallet, so if you have already done it, skip to the next step

    let { data, amount, address } = makerProxyRegistry.methods().build.call({});
    let transaction = await bitGoWallet.send({ data, amount, address, walletPassphrase });
    console.dir(transaction);

    // ============================================ //
    // ============================================ //

    // step 2 - Create CDP and withdraw DAI

    // Now we need to go get the address of the newly created proxy contract. The easiest way to do this is go to
    // the Etherscan page for the Proxy Registry contract, here: https://etherscan.io/address/0x4678f0a6958e4d2bc4f1baf7bc52e8f3564f3fe4#readContract
    // Enter your wallet address in the `proxies` query, then press `Query`. It will return your proxy address

    const proxyAddress = '0x17458bbdd96d6c19645457f5fae87ed5a07ad8fd';

    const daiSavingsRateProxy = new Contract('DSProxy').address(proxyAddress);

    // The following addresses are constants in the MakerDAO MCD ecosystem. You can look them up and verify on Etherscan
    const daiJoin = '0x9759a6ac90977b93b58547b4a71c78317f391a28';
    const ethJoin = '0x2f0b23f53734252bda2277357e97e1517d6b042a';
    const manager = '0x5ef30b9986345249bc32d8928b7ee64de9435e39';
    const jug = '0x19c0976f590d67707e62397c87829d896dc0f1f1';

    const ilk = new Buffer('4554482d41000000000000000000000000000000000000000000000000000000', 'hex');
    const dsProxyActionsContract = new Contract('DSProxyActions');

    const { data: internalData, address: proxyActionsAddress } = dsProxyActionsContract.methods()
        .openLockETHAndDraw.call({ manager, jug, ethJoin, daiJoin, ilk, wadD: withdrawAmount.toString(10) });
    // Build the external call for our proxy to create the cdp

    ({ data, amount, address } = daiSavingsRateProxy.methods()
        .execute.call({
            _target: proxyActionsAddress,
            _data: ethUtil.toBuffer(internalData),
        }));

    // send the transaction through BitGo
    transaction = await bitGoWallet.send({
        data,
        address,
        amount: depositAmount.toString(10),
        walletPassphrase,
    });

    console.dir(transaction);
}


sendBitGoTx();