add: Facebook username validation (social category)

user_scanner/user_scan/social/facebook.py

@@ -0,0 +1,117 @@
+import re
+
+import httpx
+from user_scanner.core.result import Result
+
+
+def _check(user: str) -> Result:
+    show_url = "https://facebook.com"
+
+    if not (1 <= len(user) <= 50):
+        return Result.error("Length must be 1-50 characters")
+
+    if not re.match(r"^[a-zA-Z0-9.]+$", user):
+        return Result.error("Only letters, numbers and periods allowed")
+
+    if user.isdigit():
+        return Result.error("Username cannot be numbers only")
+
+    if user.startswith(".") or user.endswith("."):
+        return Result.error("Username cannot start or end with a period")
+
+    with httpx.Client(http2=True, follow_redirects=False, timeout=10.0) as client:
+        try:
+            headers1 = {
+                'User-Agent': "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
+                '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",
+                'sec-ch-ua': '"Google Chrome";v="143", "Chromium";v="143", "Not A(Brand";v="24"',
+            }
+            client.get("https://m.facebook.com/login/", headers=headers1)
+
+            headers2 = {
+                'User-Agent': "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
+                '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",
+                'upgrade-insecure-requests': "1",
+                'sec-fetch-site': "cross-site",
+                'sec-fetch-mode': "navigate",
+                'sec-fetch-user': "?1",
+                'sec-fetch-dest': "document",
+                'sec-ch-ua': '"Google Chrome";v="143", "Chromium";v="143", "Not A(Brand";v="24"',
+                'sec-ch-ua-mobile': "?0",
+                'sec-ch-ua-platform': '"Linux"',
+                'referer': "https://www.google.com/",
+                'accept-language': "en-US,en;q=0.9",
+                'priority': "u=0, i"
+            }
+            res = client.get("https://www.facebook.com", params={'_rdr': ""}, headers=headers2)
+            html = res.text
+
+            lsd_match = re.search(r'\["LSD",\[\],\{"token":"([^"]+)"\}', html) or \
+                re.search(r'name="lsd"\s+value="([^"]+)"', html) or \
+                re.search(r'"lsd":"([^"]+)"', html)
+
+            j_match = re.search(r'jazoest=(\d+)', html) or \
+                re.search(r'name="jazoest"\s+value="(\d+)"', html)
+
+            lsd = lsd_match.group(1) if lsd_match else None
+            jazoest = j_match.group(1) if j_match else None
+
+            if not lsd or not jazoest:
+                return Result.error(f"Token extraction failed (LSD: {bool(lsd)}, Jazoest: {bool(jazoest)})")
+
+            headers3 = {
+                'User-Agent': "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
+                'Accept-Encoding': "identity",
+                'sec-ch-ua-full-version-list': '"Google Chrome";v="143.0.7499.192", "Chromium";v="143.0.7499.192", "Not A(Brand";v="24.0.0.0"',
+                'sec-ch-ua-platform': '"Linux"',
+                'sec-ch-ua': '"Google Chrome";v="143", "Chromium";v="143", "Not A(Brand";v="24"',
+                'sec-ch-ua-model': '""',
+                'sec-ch-ua-mobile': "?0",
+                'x-asbd-id': "359341",
+                'x-fb-lsd': lsd,
+                'sec-ch-prefers-color-scheme': "dark",
+                'sec-ch-ua-platform-version': '""',
+                'origin': "https://www.facebook.com",
+                'sec-fetch-site': "same-origin",
+                'sec-fetch-mode': "cors",
+                'sec-fetch-dest': "empty",
+                'referer': "https://www.facebook.com/login/identify/?ctx=recover&ars=facebook_login&from_login_screen=0",
+                'accept-language': "en-US,en;q=0.9",
+                'priority': "u=1, i"
+            }
+
+            payload = {
+                'jazoest': jazoest,
+                'lsd': lsd,
+                'email': user,
+                'did_submit': "1",
+                '__user': "0",
+                '__a': "1",
+                '__req': "7"
+            }
+
+            response = client.post(
+                "https://www.facebook.com/ajax/login/help/identify.php",
+                params={'ctx': "recover"},
+                data=payload,
+                headers=headers3
+            )
+            body = response.text
+
+            if "These accounts matched your search" in body or "redirectPageTo" in body:
+                return Result.taken(url=show_url)
+            elif "No search results" in body or "Your search did not return any results." in body:
+                return Result.available(url=show_url)
+            else:
+                return Result.error("Unexpected response, report it via GitHub issues")
+
+        except httpx.TimeoutException:
+            return Result.error("Connection timed out")
+        except Exception as e:
+            return Result.error(f"Unexpected exception: {e}")
+
+
+def validate_facebook(user: str) -> Result:
+    return _check(user)