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fix: align Cloudflare challenge browser flow #2

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Merged
dariyaanis merged 1 commit into from
Oct 1, 2026
Merged

fix: align Cloudflare challenge browser flow #2

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26 changes: 12 additions & 14 deletions examples/cloudflare_challenge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,20 +4,25 @@
import time

from captcha_solver_api.tasks import TurnstileTaskProxyless
from common import create_client, show_success
from common import create_client, required_env, show_success
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support.ui import WebDriverWait
from seleniumbase import Driver

URL = os.getenv("TARGET_URL") or "https://2captcha.com/demo/cloudflare-turnstile-challenge"
URL = required_env("TARGET_URL")
BROWSER_USER_AGENT = os.getenv("BROWSER_USER_AGENT") or (
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
"(KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36"
)

INTERCEPT_SCRIPT = """
window.__turnstileParams = null;
window.__turnstileCallback = null;
const timer = setInterval(() => {
if (!window.turnstile) return;
clearInterval(timer);
window.turnstile.render = (_container, options) => {
const originalRender = window.turnstile.render;
window.turnstile.render = (container, options) => {
window.__turnstileParams = {
websiteKey: options.sitekey,
websiteURL: window.location.href,
Expand All @@ -27,7 +32,7 @@
userAgent: navigator.userAgent,
};
window.__turnstileCallback = options.callback;
return undefined;
return originalRender ? originalRender(container, options) : undefined;
};
}, 10);
"""
Expand Down Expand Up @@ -61,24 +66,17 @@ def capture_params(driver):
return state["params"]


def normalized_user_agent() -> str:
"""Read Chrome's UA before launching the challenge browser."""
with Driver(browser="chrome", headless=True) as driver:
user_agent = driver.execute_script("return navigator.userAgent")
return user_agent.replace("Headless", "").replace("Chromium", "Chrome")


def main() -> None:
user_agent = normalized_user_agent()
with (
Driver(browser="chrome", headless=False, uc=True, agent=user_agent) as driver,
Driver(browser="chrome", headless=False, agent=BROWSER_USER_AGENT) as driver,
create_client() as client,
):
driver.get(URL)
driver.execute_cdp_cmd(
"Page.addScriptToEvaluateOnNewDocument",
{"source": INTERCEPT_SCRIPT},
)
driver.get(URL)
driver.refresh()
params = capture_params(driver)
if params is None:
return
Expand Down
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