2 files changed, 49 insertions, 3 deletions

diff --git a/g4f/Provider/Phind.py b/g4f/Provider/Phind.py
index e7156842..a7fdbeca 100644
--- a/g4f/Provider/Phind.py
+++ b/g4f/Provider/Phind.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from urllib import parse
 from datetime import datetime
 
 from ..typing import AsyncResult, Messages
@@ -55,9 +56,9 @@ class Phind(AsyncGeneratorProvider):
                     "customLinks": []
                 },
                 "context": "\n".join([message["content"] for message in messages if message["role"] == "system"]),
-                "rewrittenQuestion": prompt,
-                "challenge": 0.21132115912208504
             }
+            data["challenge"] = generate_challenge(data)
+            
             async with session.post(f"https://https.api.phind.com/infer/", headers=headers, json=data) as response:
                 new_line = False
                 async for line in response.iter_lines():
@@ -65,6 +66,8 @@ class Phind(AsyncGeneratorProvider):
                         chunk = line[6:]
                         if chunk.startswith(b'<PHIND_DONE/>'):
                             break
+                        if chunk.startswith(b'<PHIND_BACKEND_ERROR>'):
+                            raise RuntimeError(f"Response: {chunk}")
                         if chunk.startswith(b'<PHIND_WEBRESULTS>') or chunk.startswith(b'<PHIND_FOLLOWUP>'):
                             pass
                         elif chunk.startswith(b"<PHIND_METADATA>") or chunk.startswith(b"<PHIND_INDICATOR>"):
@@ -78,3 +81,46 @@ class Phind(AsyncGeneratorProvider):
                             new_line = False
                         else:
                             new_line = True
+
+def deterministic_stringify(obj):
+    def handle_value(value):
+        if isinstance(value, (dict, list)):
+            if isinstance(value, list):
+                return '[' + ','.join(sorted(map(handle_value, value))) + ']'
+            else:  # It's a dict
+                return '{' + deterministic_stringify(value) + '}'
+        elif isinstance(value, bool):
+            return 'true' if value else 'false'
+        elif isinstance(value, (int, float)):
+            return format(value, '.8f').rstrip('0').rstrip('.')
+        elif isinstance(value, str):
+            return f'"{value}"'
+        else:
+            return 'null'
+
+    items = sorted(obj.items(), key=lambda x: x[0])
+    return ','.join([f'{k}:{handle_value(v)}' for k, v in items if handle_value(v) is not None])
+
+def simple_hash(s):
+    d = 0
+    for char in s:
+        if len(char) > 1 or ord(char) >= 256:
+            continue
+        d = ((d << 5) - d + ord(char[0])) & 0xFFFFFFFF
+        if d > 0x7FFFFFFF: # 2147483647
+            d -= 0x100000000 # Subtract 2**32
+    return d
+
+def generate_challenge(obj):
+    deterministic_str = deterministic_stringify(obj)
+    encoded_str = parse.quote(deterministic_str, safe='')
+
+    c = simple_hash(encoded_str)
+    a = (9301 * c + 49297)
+    b = 233280
+
+    # If negativ, we need a special logic
+    if a < 0:
+        return ((a%b)-b)/b
+    else:
+        return a%b/b
\ No newline at end of file
diff --git a/g4f/models.py b/g4f/models.py
index e58ccef2..b971cf2d 100644
--- a/g4f/models.py
+++ b/g4f/models.py
@@ -89,7 +89,7 @@ gpt_4 = Model(
     name          = 'gpt-4',
     base_provider = 'openai',
     best_provider = RetryProvider([
-        Bing, Phind, Liaobots, 
+        Bing, Liaobots, 
     ])
 )