docs: add CloakBrowser stealth browser example

docs/examples/stealth_cloakbrowser.py

@@ -0,0 +1,126 @@
+"""
+CloakBrowser + Crawl4AI: Stealth crawling with source-level fingerprint patches.
+
+CloakBrowser is a patched Chromium binary that modifies fingerprints at the C++ source
+level, rather than through JavaScript injection. This makes it effective against sites
+that detect runtime fingerprint overrides (e.g. Cloudflare, reCAPTCHA, DataDome).
+
+This example connects Crawl4AI to CloakBrowser via CDP, then runs bot detection tests
+to verify stealth effectiveness.
+
+Install: pip install cloakbrowser crawl4ai
+The CloakBrowser binary (~200MB) auto-downloads on first run.
+https://github.com/CloakHQ/CloakBrowser
+"""
+
+import asyncio
+import base64
+
+from crawl4ai import AsyncWebCrawler, BrowserConfig, CrawlerRunConfig
+
+from cloakbrowser import launch_async
+
+
+async def example_basic():
+    """Basic usage: crawl a page through CloakBrowser."""
+    print("\n=== Example 1: Basic Stealth Crawling ===")
+
+    cb_browser = await launch_async(
+        headless=True,
+        args=["--remote-debugging-port=9243", "--remote-debugging-address=127.0.0.1"],
+    )
+
+    async with AsyncWebCrawler(
+        config=BrowserConfig(browser_mode="cdp", cdp_url="http://127.0.0.1:9243")
+    ) as crawler:
+        result = await crawler.arun(
+            url="https://www.example.com",
+            config=CrawlerRunConfig(),
+        )
+        print(f"Status: {result.status_code}")
+        print(f"Extracted {len(result.markdown)} chars of markdown")
+
+    await cb_browser.close()
+
+
+async def example_bot_detection():
+    """Verify stealth: run bot detection tests, save screenshot, and print results."""
+    print("\n=== Example 2: Bot Detection Verification ===")
+
+    cb_browser = await launch_async(
+        headless=True,
+        args=["--remote-debugging-port=9243", "--remote-debugging-address=127.0.0.1"],
+    )
+
+    async with AsyncWebCrawler(
+        config=BrowserConfig(browser_mode="cdp", cdp_url="http://127.0.0.1:9243")
+    ) as crawler:
+        result = await crawler.arun(
+            url="https://bot.sannysoft.com",
+            config=CrawlerRunConfig(
+                wait_until="networkidle",
+                screenshot=True,
+            ),
+        )
+        print(f"Status: {result.status_code}")
+
+        # Save screenshot for visual verification
+        if result.screenshot:
+            with open("cloakbrowser_bot_detection.png", "wb") as f:
+                f.write(base64.b64decode(result.screenshot))
+            print("Screenshot saved: cloakbrowser_bot_detection.png")
+
+        # Parse detection results from the HTML table
+        from bs4 import BeautifulSoup
+
+        soup = BeautifulSoup(result.html, "html.parser")
+        passed = failed = 0
+        for row in soup.select("table tr"):
+            cells = row.select("td")
+            if len(cells) >= 2:
+                name = cells[0].get_text(strip=True)
+                value = cells[1].get_text(strip=True)
+                style = cells[1].get("style", "")
+                if "#f45159" in style:
+                    print(f"  ✗ {name:35s} {value}")
+                    failed += 1
+                else:
+                    print(f"  ✓ {name:35s} {value}")
+                    passed += 1
+        print(f"\nResults: {passed} passed, {failed} failed")
+
+    await cb_browser.close()
+
+
+async def example_with_proxy():
+    """Use a proxy with CloakBrowser for geo-targeted crawling."""
+    print("\n=== Example 3: With Proxy ===")
+
+    # Pass proxy to CloakBrowser. Crawl4AI doesn't need to know about it.
+    cb_browser = await launch_async(
+        headless=True,
+        proxy="http://user:pass@proxy-host:port",  # Replace with your proxy
+        args=["--remote-debugging-port=9243", "--remote-debugging-address=127.0.0.1"],
+    )
+
+    async with AsyncWebCrawler(
+        config=BrowserConfig(browser_mode="cdp", cdp_url="http://127.0.0.1:9243")
+    ) as crawler:
+        result = await crawler.arun(
+            url="https://httpbin.org/ip",
+            config=CrawlerRunConfig(),
+        )
+        print(f"IP result: {result.markdown[:200]}")
+
+    await cb_browser.close()
+
+
+async def main():
+    await example_basic()
+    await example_bot_detection()
+    # Uncomment after setting your proxy:
+    # await example_with_proxy()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())