cfx-lecture-3-examples

index.js

const Account = require('js-conflux-sdk/src/account');
const assert = require('assert');
const { Conflux, Drip, Message, util } = require('js-conflux-sdk');

async function main() {
    // ---- generate random private key ----
    const privkey = util.sign.randomPrivateKey();
    console.log('private key:', util.format.hex(privkey));

    // ---- derive public key ----
    const pubkey = util.sign.privateKeyToPublicKey(privkey);
    console.log('public key:', util.format.hex(pubkey));

    // ---- derive address ----
    const address = util.sign.publicKeyToAddress(pubkey);
    console.log('address:', util.format.hex(address));

    // ---- sign message ----
    const msg = new Message('Hello! Sincerely, Peter');
    msg.sign(privkey);
    console.log('signed message:', msg)

    // ---- check signature ----
    let recovered = Message.recover(msg.signature, msg.hash)
    assert.strictEqual(recovered, util.format.hex(pubkey))

    // ---- detect tampering using signature ----
    msg.message = 'Hello! Sincerely, ----- Hacker';
    recovered = Message.recover(msg.signature, msg.hash)
    assert.notStrictEqual(recovered, util.format.hex(pubkey))

    // ---- create and sign transaction ----
    const local_account = new Account({ privateKey: util.format.hex(privkey) });

    const tx = local_account.signTransaction({
        from: util.format.hex(address),
        to: util.format.hex(address),
        value: Drip.fromCFX(10).toDrip(),
        nonce: '0x00',
        gasPrice: '0x00',
        gas: '0x00',
        storageLimit: '0x00',
        epochHeight: '0x00',
    });

    console.log('transaction:', tx);
    console.log('transaction hash:', tx.hash);

    // ---- send transaction ----
    const conflux = new Conflux({ url: 'http://mainnet-jsonrpc.conflux-chain.org:12537' });

    // TODO: import your Conflux Portal wallet
    // follow: Account Details, Export Private Key
    // make sure to add a '0x' prefix to your private key
    // make sure your account has sufficient balance
    const account = conflux.Account({ privateKey: util.format.hex(privkey) });

    // set recipient
    const to = '0x145834072064DcD9B931237B5aEe217c241e3644';

    // set value to send
    const value = Drip.fromCFX(10).toDrip();

    const epochHeight = await conflux.getEpochNumber();
    const estimate = await conflux.estimateGasAndCollateral({ to, value });
    const gasPrice = await conflux.getGasPrice();
    const nonce = await conflux.getNextNonce(account.address);
    const status = await conflux.getStatus();

    const txHash = await account.sendTransaction({
        to,
        value,
        nonce,
        gasPrice,
        gas: estimate.gasUsed,
        storageLimit: estimate.storageCollateralized,
        chainId: status.chainId,
        data: null,
        epochHeight,
    });

    console.log('sending transaction, hash:', txHash);

    // wait 10 seconds
    await new Promise(resolve => setTimeout(resolve, 10 * 1000));

    // get transaction
    const transaction = await conflux.getTransactionByHash(txHash);
    console.log('transaction:', transaction);

    // wait 10 seconds
    await new Promise(resolve => setTimeout(resolve, 10 * 1000));

    // get receipt
    const receipt = await conflux.getTransactionReceipt(txHash);
    console.log('receipt', receipt);
}

main()