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# to you under the Apache License, Version 2.0 (the
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# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing,
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# specific language governing permissions and limitations
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"""
Module for different webdrivers considered.
"""
import importlib.resources
import json
import logging
import os.path
from pathlib import Path
from typing import Iterable
from selenium import webdriver
from selenium.webdriver import DesiredCapabilities
from selenium.webdriver.remote.webdriver import WebDriver
from .config import Config
from .driver_check import Drivers, is_driver_installed, log_driver_version
from .error import WebDriverSendError
logger = logging.getLogger("wtl")
def _setup_chrome(config: Config, profile_path: Path = None) -> WebDriver:
assert is_driver_installed(Drivers.GOOGLE_CHROME) or is_driver_installed(Drivers.CHROMIUM)
assert is_driver_installed(Drivers.CHROMEDRIVER)
log_driver_version("Google Chrome version", Drivers.GOOGLE_CHROME)
log_driver_version("Chromium version", Drivers.CHROMIUM)
log_driver_version("Chromedriver version", Drivers.CHROMEDRIVER)
chrome_options = webdriver.ChromeOptions()
browser = config.browser
# Disable security
# Don't enforce the same-origin policy, see https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
# Without this the JS code executed with Selenium WebDriver cannot access cross-domain CSS which are popular.
chrome_options.add_argument("--disable-web-security")
chrome_options.add_argument("--allow-running-insecure-content")
chrome_options.add_argument("--no-sandbox")
# Disable unused/annoying features
chrome_options.add_argument("--disable-infobars")
chrome_options.add_argument("--mute-audio")
chrome_options.add_argument("--hide-scrollbars")
chrome_options.add_argument("--disable-dev-shm-usage")
chrome_options.headless = browser.headless
if profile_path:
profile_dir = profile_path.name
user_data_dir = str(profile_path.parent)
chrome_options.add_argument(f"--user-data-dir={user_data_dir}")
chrome_options.add_argument(f"--profile-directory={profile_dir}")
if browser.proxy:
chrome_options.add_argument(f"--proxy-server={browser.proxy}")
chrome_options.add_argument("--disk-cache-dir=chrometemp/") # Proxy messes up access rights of cache folder
if browser.enable_mhtml:
with importlib.resources.path("webtraversallibrary.extension", "wtl_extension.crx") as filepath:
chrome_options.add_extension(str(filepath))
chrome_options.add_experimental_option(
"prefs", {"download.default_directory": os.path.expanduser(config.scraping.temp_path)}
)
if "pixelRatio" in browser and browser.pixelRatio != 0:
# Emulating a mobile device - the full set of parameters must be provided
chrome_options.add_experimental_option(
"mobileEmulation",
{
"deviceMetrics": {"width": browser.width, "height": browser.height, "pixelRatio": browser.pixelRatio},
"userAgent": browser.useragent,
},
)
else:
if "useragent" in browser:
chrome_options.add_argument(f'--user-agent="{browser.useragent}"')
if "width" in browser and "height" in browser:
chrome_options.add_argument(f"--window-size={browser.width},{browser.height + 120}")
capabilities = DesiredCapabilities.CHROME.copy()
capabilities["goog:loggingPrefs"] = {"browser": "ALL"}
def _add_script(driver: WebDriver, script_path: str):
send(driver, "Page.addScriptToEvaluateOnNewDocument", {"source": script_path})
WebDriver.add_script = _add_script
# launch Chrome
driver = webdriver.Chrome(options=chrome_options, desired_capabilities=capabilities)
return driver
def _setup_firefox(config: Config, _profile_path: Path = None) -> WebDriver:
assert is_driver_installed(Drivers.FIREFOX)
assert is_driver_installed(Drivers.GECKODRIVER)
log_driver_version("Firefox version", Drivers.FIREFOX)
log_driver_version("Geckodriver version", Drivers.GECKODRIVER)
firefox_profile = webdriver.FirefoxProfile()
firefox_options = webdriver.FirefoxOptions()
browser = config.browser
# Disable security
firefox_options.add_argument("-safe-mode")
firefox_profile.set_preference("browser.link.open_newwindow", 3)
firefox_profile.set_preference("browser.link.open_newwindow.restriction", 0)
firefox_profile.set_preference("media.volume_scale", "0.0")
firefox_options.headless = browser.headless
if browser.proxy:
address = browser.proxy.split(":")
firefox_profile.set_preference("network.proxy.http", address[0])
firefox_profile.set_preference("network.proxy.http_port", address[1])
if browser.enable_mhtml:
# TODO
logger.critical("Firefox does not currently support MHTML")
assert False
if "pixelRatio" in browser and browser.pixelRatio != 0:
# TODO
logger.error("Firefox does not currently support custom pixelratio")
if "useragent" in browser:
firefox_profile.set_preference("general.useragent.override", browser.useragent)
def _add_script(driver: WebDriver, script_path: str):
send(driver, "Page.addScriptToEvaluateOnNewDocument", {"source": script_path})
WebDriver.add_script = _add_script
# TODO No support to output console logs for geckodriver
driver = webdriver.Firefox(options=firefox_options, firefox_profile=firefox_profile)
# Screen size (we can't set viewport size as for Chrome so we adjust screen size)
if "width" in browser and "height" in browser:
driver.set_window_size(browser.width, browser.height)
return driver
[docs]def setup_driver(config: Config, profile_path: Path = None, preload_callbacks: Iterable[Path] = None) -> WebDriver:
"""
Creates a WebDriver object with the given configuration.
:param: configuration Configuration dictionary
:return: A WebDriver instance
"""
driver = None
name = config.browser.browser.lower()
if name == "chrome":
driver = _setup_chrome(config=config, profile_path=profile_path)
elif name == "firefox":
driver = _setup_firefox(config=config, _profile_path=profile_path)
else:
raise NotImplementedError(f"Uninmplemented browser type given to setup_driver: {config.browser.browser}")
preload_callbacks = preload_callbacks or []
for cb in preload_callbacks:
driver.add_script(str(cb))
return driver
[docs]def send(driver: WebDriver, cmd: str, params: dict = None) -> int:
"""
Send command to the webdriver, return resulting status code.
"""
# pylint: disable=protected-access
params = params or {}
resource = f"/session/{driver.session_id}/chromium/send_command_and_get_result"
url = driver.command_executor._url + resource
body = json.dumps({"cmd": cmd, "params": params})
response = driver.command_executor._request("POST", url, body)
value = response.get("value")
if response.get("status", False):
raise WebDriverSendError(f"Command '{cmd}' returned status={value}")
return value