fix: resolve BDSM Singles browser challenge

user_scanner/user_scan/adult/bdsmsingles.py

@@ -1,12 +1,37 @@
+import hashlib
 import re
-from user_scanner.core.orchestrator import generic_validate, Result
 
+from user_scanner.core.orchestrator import Result, generic_validate, make_request
 
-def validate_bdsmsingles(user):
+
+def validate_bdsmsingles(user: str) -> Result:
     url = f"https://www.bdsmsingles.com/members/{user}/"
     show_url = url
 
     def process(response):
+        if response.status_code == 202:
+            challenge = re.search(
+                r'prefix="([0-9a-f]+)",win="(\d+)",diff=(\d+)', response.text
+            )
+            if not challenge or challenge.group(3) != "4":
+                return Result.error("Unsupported browser challenge.", url=show_url)
+
+            prefix, window, _ = challenge.groups()
+            nonce = next(
+                (
+                    value
+                    for value in range(1 << 20)
+                    if hashlib.sha256(f"{prefix}{value}".encode())
+                    .hexdigest()
+                    .startswith("0000")
+                ),
+                None,
+            )
+            if nonce is None:
+                return Result.error("Could not solve browser challenge.", url=show_url)
+
+            response = make_request(url, cookies={"_jscp": f"{window}.{nonce}"})
+
         if response.status_code == 200 and "<title>Profile" in response.text:
             extra = {}
             media = {}
@@ -18,7 +43,8 @@ def process(response):
 
             # Info / Orientation
             info_match = re.search(
-                r"</h2>\s*<p>\s*(.*?)\s*</p>", response.text, re.DOTALL)
+                r"</h2>\s*<p>\s*(.*?)\s*</p>", response.text, re.DOTALL
+            )
             if info_match:
                 # Clean up multiple whitespaces
                 cleaned_info = re.sub(r"\s+", " ", info_match.group(1)).strip()
@@ -28,16 +54,17 @@ def process(response):
 
             # Avatar (if not default nophoto svg)
             avatar_match = re.search(
-                r'src="(https://media\.bdsmsingles\.com/images/user_photo/[^"]+)"', response.text)
+                r'src="(https://media\.bdsmsingles\.com/images/user_photo/[^"]+)"',
+                response.text,
+            )
             if avatar_match and "nophoto" not in avatar_match.group(1):
                 media["image"] = avatar_match.group(1)
 
             # Table fields extraction
             def extract_table_field(field_name):
                 # Search for field label followed by its value div
                 pattern = rf"{field_name}</div>\s*<div style=\"[^\"]*width:\s*60%;[^\"]*\">\s*(.*?)\s*</div>"
-                match = re.search(pattern, response.text,
-                                  re.DOTALL | re.IGNORECASE)
+                match = re.search(pattern, response.text, re.DOTALL | re.IGNORECASE)
                 return match.group(1).strip() if match else None
 
             first_name = extract_table_field("First name")
@@ -62,10 +89,11 @@ def extract_table_field(field_name):
 
             return Result.taken(extra=extra, media=media, url=show_url)
 
-        # No confirmed not-found marker exists: /members/ sits behind an active
-        # JS challenge, and the site name matches its own home page, its login
-        # redirect and the challenge page alike — keying a miss on any of them
-        # reports every handle as free.
-        return Result.error("Unexpected response body, report it via GitHub issues.", url=show_url)
+        if response.status_code == 302 and response.headers.get("location") == "/":
+            return Result.available(url=show_url)
+
+        return Result.error(
+            "Unexpected response body, report it via GitHub issues.", url=show_url
+        )
 
     return generic_validate(url, process, show_url=show_url)