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Add User-Agent rotation system (#198) #199

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Add User-Agent rotation system (#198) #199

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53 changes: 53 additions & 0 deletions user_scanner/core/helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -199,3 +199,56 @@ def get_proxy_count() -> int:
return _proxy_manager.count()
return 0



# =============================================================================
# User-Agent Rotation
# =============================================================================

def get_random_user_agent() -> str:
"""
Return a random modern User-Agent string.

Provides rotating user agents to reduce fingerprinting when scanning.
Updated 2026-02 to include current browser versions.

Returns:
A random User-Agent string from the curated list.
"""
user_agents = [
# Chrome on Windows 11
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36",

# Chrome on macOS Sonoma
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 14.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",

# Firefox on Windows
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0",

# Firefox on macOS
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 14.2; rv:134.0) Gecko/20100101 Firefox/134.0",

# Safari on macOS
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Safari/605.1.15",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 14.2) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Safari/605.1.15",

# Safari on iPhone 15
"Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1",

# Chrome on Android (Pixel 8)
"Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36",
"Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Mobile Safari/537.36",

# Samsung Internet
"Mozilla/5.0 (Linux; Android 14; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/25.0 Chrome/121.0.0.0 Mobile Safari/537.36",

# Edge on Windows
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36 Edg/132.0.0.0",
]

return random.choice(user_agents)
3 changes: 2 additions & 1 deletion user_scanner/user_scan/creator/substack.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import re
from user_scanner.core.orchestrator import status_validate, Result
from user_scanner.core.helpers import get_random_user_agent


def validate_substack(user: str) -> Result:
Expand All @@ -14,7 +15,7 @@ def validate_substack(user: str) -> Result:
url = f"https://{user}.substack.com"

headers = {
'User-Agent': "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Mobile Safari/537.36",
'User-Agent': get_random_user_agent(),
'Accept': "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
'Accept-Encoding': "identity",
'accept-language': "en-US,en;q=0.9",
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