MetaMask + Puppeteer

account_details.js

const dappeteer = require('@chainsafe/dappeteer');
const puppeteer = require('puppeteer');

const SEED = 'hello world its me again';
const PWD = '123456Git';

const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));

const retry = async (fn, count = 3) => {
    try {
        return await fn();
    } catch (error) {
        if (count <= 0) {
            throw error;
        }
        return await retry(fn, --count);
    }
}

(async () => {

    const browser = await dappeteer.launch(puppeteer, { metamaskVersion: 'v10.8.1', headless: false, defaultViewport: null });
    const metamask = await dappeteer.setupMetamask(browser, { seed: SEED, password: PWD });

    const metamaskPage = metamask.page;

    // wait ::: until account options menu shows up
    await retry(
        () => metamaskPage.waitForSelector('button.menu-bar__account-options', { visible: true })
    );

    // click ::: account options menu
    await retry(
        () => metamaskPage.click('button.menu-bar__account-options')
    );

    // wait ::: until popover menu shows up
    await retry(
        () => metamaskPage.waitForSelector('div#popover-content', { visible: true })
    );

    // click ::: account details button
    await metamaskPage.click('button[data-testid="account-options-menu__account-details"]');

    // wait ::: until account details modal shows up
    await retry(
        () => metamaskPage.waitForSelector('div.account-details-modal.account-modal', { visible: true })
    );

    // read ::: account address
    const address = await metamaskPage.$eval('div.qr-code__address', el => el.textContent);

    // click ::: export pkey button
    await metamaskPage.click('button.account-details-modal__button:last-child');

    // wait ::: until confirmation modal shows up
    await retry(
        () => metamaskPage.waitForSelector('input[type=password].export-private-key-modal__password-input', { visible: true })
    );

    // type ::: password input
    await metamaskPage.type('input[type=password].export-private-key-modal__password-input', PWD);

    // click ::: confirm button
    await metamaskPage.click('button.export-private-key-modal__button:last-child');

    // wait ::: until seed phrases shows up
    await retry(
        () => metamaskPage.waitForSelector('textarea.readonly-input__input.export-private-key-modal__password-display-textarea', { visible: true })
    );

    // read ::: account pkey
    const pkey = await metamaskPage.$eval('textarea.readonly-input__input.export-private-key-modal__password-display-textarea', el => el.value);

    // click ::: close button
    await metamaskPage.click('button.export-private-key-modal__button');

    console.log(`account/wallet address: ${address}, pkey: ${pkey}`);

    await browser.close();

})();

create_account.js

const dappeteer = require('@chainsafe/dappeteer');
const puppeteer = require('puppeteer');

const SEED = 'hello world its me again';
const PWD = '123456Git';

const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));

const retry = async (fn, count = 3) => {
    try {
        return await fn();
    } catch (error) {
        if (count <= 0) {
            throw error;
        }
        return await retry(fn, --count);
    }
}

(async () => {

    const browser = await dappeteer.launch(puppeteer, { metamaskVersion: 'v10.8.1', headless: false, defaultViewport: null });
    const metamask = await dappeteer.setupMetamask(browser, { seed: SEED, password: PWD });

    const metamaskPage = metamask.page;

    // navigate ::: metamask create account page
    await metamaskPage.goto(metamaskPage.url().endsWith('#new-account') ? metamaskPage.url() : `${metamaskPage.url()}new-account`, { waitUntil: 'networkidle2' });

    // wait ::: until create button shows
    await retry(
        () => metamaskPage.waitForSelector('button.new-account-create-form__button:last-child', { visible: true })
    );

    // click ::: create button
    await metamaskPage.click('button.new-account-create-form__button:last-child');

    // wait ::: until main page shows
    await retry(
        () => metamaskPage.waitForSelector('#app-content .main-container', { visible: true })
    );

    await browser.close();

})();

install.sh

$ npm install -s puppeteer
$ npm install -s @chainsafe/dappeteer