Haketilo

# SPDX-License-Identifier: GPL-3.0-or-later

"""

Common fixtures for Haketilo unit tests

"""

# This file is part of Haketilo.

#

# Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.

#

# I, Wojtek Kosior, thereby promise not to sue for violation of this file's

# license. Although I request that you do not make use of this code in a

# proprietary program, I am not going to enforce this in court.

import pytest

from pathlib import Path

from tempfile import TemporaryDirectory

from selenium.webdriver.common.by import By

from selenium.webdriver.support.ui import WebDriverWait

from selenium.webdriver.support import expected_conditions as EC

from .profiles           import firefox_safe_mode

from .server             import do_an_internet

from .extension_crafting import make_extension

from .world_wide_library import start_serving_script, dump_scripts

from .misc_constants     import here

@pytest.fixture(scope="session")

def proxy():

    httpd = do_an_internet()

    yield httpd

    httpd.shutdown()

@pytest.fixture(scope="session")

def _driver(proxy):

    with firefox_safe_mode() as driver:

        yield driver

        driver.quit()

def close_all_but_one_window(driver):

    while len(driver.window_handles) > 1:

        driver.switch_to.window(driver.window_handles[-1])

        driver.close()

    driver.switch_to.window(driver.window_handles[0])

@pytest.fixture()

def driver(_driver, request):

    nav_target = request.node.get_closest_marker('get_page')

    nav_target = nav_target.args[0] if nav_target else 'about:blank'

    second_driver = request.node.get_closest_marker('second_driver')

    if second_driver:

        with firefox_safe_mode() as _driver:

            _driver.get(nav_target)

            yield _driver

            _driver.quit()

    else:

        close_all_but_one_window(_driver)

        _driver.get(nav_target)

        _driver.implicitly_wait(0)

        yield _driver

@pytest.fixture()

def webextension(driver, request):

    ext_data = request.node.get_closest_marker('ext_data')

    if ext_data is None:

        raise Exception('"webextension" fixture requires "ext_data" marker to be set')

    ext_data = ext_data.args[0].copy()

    navigate_to = ext_data.get('navigate_to')

    if navigate_to is not None:

        del ext_data['navigate_to']

    driver.get('https://gotmyowndoma.in/')

    ext_path = make_extension(Path(driver.firefox_profile.path), **ext_data)

    addon_id = driver.install_addon(str(ext_path), temporary=True)

    get_url = lambda d: d.execute_script('return window.ext_page_url;')

    ext_page_url = WebDriverWait(driver, 10).until(get_url)

    driver.get(ext_page_url)

    if navigate_to is not None:

        driver.get(driver.current_url.replace('testpage.html', navigate_to))

    yield

    # Unloading an extension might cause its windows to vanish. Make sure

    # there's at least one window navigated to some other page before

    # uninstalling the addon. Otherwise, we could be left with a windowless

    # browser :c

    driver.switch_to.window(driver.window_handles[-1])

    driver.get('https://gotmyowndoma.in/')

    driver.uninstall_addon(addon_id)

    ext_path.unlink()

@pytest.fixture()

def haketilo(driver):

    addon_id = driver.install_addon(str(here.parent / 'mozilla-build.zip'),

                                    temporary=True)

    yield

    driver.uninstall_addon(addon_id)

script_injector_script = '''\

/*

 * Selenium by default executes scripts in some weird one-time context. We want

 * separately-loaded scripts to be able to access global variables defined

 * before, including those declared with `const` or `let`. To achieve that, we

 * run our scripts by injecting them into the page with a <script> tag that runs

 * javascript served by our proxy. We use custom properties of the `window`

 * object to communicate with injected code.

 */

const inject = async () => {

    delete window.haketilo_selenium_return_value;

    delete window.haketilo_selenium_exception;

    window.returnval = val => window.haketilo_selenium_return_value = val;

    const injectee = document.createElement('script');

    injectee.src = arguments[0];

    injectee.type = "application/javascript";

    injectee.async = true;

    const prom = new Promise(cb => injectee.onload = cb);

    window.arguments = arguments[1];

    document.body.append(injectee);

    await prom;

    /*

     * To ease debugging, we want this script to signal all exceptions from the

     * injectee.

     */

    if (window.haketilo_selenium_exception !== false)

        throw ['haketilo_selenium_error',

               'Error in injected script! Check your geckodriver.log and ./injected_scripts/!'];

    return window.haketilo_selenium_return_value;

}

return inject();

'''

def _execute_in_page_context(driver, script, args):

    script = script + '\n;\nwindow.haketilo_selenium_exception = false;'

    script_url = start_serving_script(script)

    try:

        result = driver.execute_script(script_injector_script, script_url, args)

        if type(result) is list and len(result) == 2 and \

           result[0] == 'haketilo_selenium_error':

            raise Exception(result[1])

        return result

    except Exception as e:

        dump_scripts()

        raise e from None

# Some fixtures here just define functions that operate on driver. We should

# consider making them into webdriver wrapper class methods.

@pytest.fixture()

def execute_in_page(driver):

    def do_execute(script, *args):

        return _execute_in_page_context(driver, script, args)

    yield do_execute

@pytest.fixture()

def wait_elem_text(driver):

    def do_wait(id, text):

        WebDriverWait(driver, 10).until(

            EC.text_to_be_present_in_element((By.ID, id), text)

        )

    yield do_wait