fix: handle bytes responses in auth API methods

dimo/api/auth.py

@@ -2,6 +2,7 @@
 from dimo.errors import check_type, check_optional_type
 from urllib.parse import urlencode
 from typing import Dict, Optional
+import json
 
 
 class Auth:
@@ -36,13 +37,18 @@ def generate_challenge(
             "address": address,
         }
 
-        return self._request(
+        response = self._request(
             "POST",
             "Auth",
             "/auth/web3/generate_challenge",
             data=urlencode(body),
             headers=headers,
         )
+
+        if isinstance(response, bytes):
+            response = json.loads(response.decode('utf-8'))
+
+        return response
 
     def sign_challenge(self, message: str, private_key: str) -> str:
         check_type("message", message, str)
@@ -78,13 +84,18 @@ def submit_challenge(
 
         encoded_data = urlencode(form_data)
 
-        return self._request(
+        response = self._request(
             "POST",
             "Auth",
             "/auth/web3/submit_challenge",
             data=encoded_data,
             headers=headers,
         )
+
+        if isinstance(response, bytes):
+            response = json.loads(response.decode('utf-8'))
+
+        return response
 
     # Requires client_id, domain, and private_key. Address defaults to client_id.
     def get_dev_jwt(
@@ -96,7 +107,18 @@ def get_dev_jwt(
         scope="openid email",
         response_type="code",
     ) -> Dict:
-
+        """
+        Generate a signed developer JWT in one step.
+        For testing, mocks and POCs.
+
+        Args:
+            client_id (str): The Ethereum address of the client
+            domain (str): The domain name for the client
+            private_key (str): The private key to sign the challenge
+
+        Returns:
+            dict: The authentication response containing access_token
+        """
         check_type("client_id", client_id, str)
         check_type("domain", domain, str)
         check_type("private_key", private_key, str)
@@ -109,6 +131,7 @@ def get_dev_jwt(
 
         headers = {"Content-Type": "application/x-www-form-urlencoded"}
 
+        # Generate a challenge
         challenge = self.generate_challenge(
             headers=headers,
             client_id=client_id,
@@ -117,14 +140,21 @@ def get_dev_jwt(
             response_type=response_type,
             address=address,
         )
-
+
+        if isinstance(challenge, bytes):
+            challenge = json.loads(challenge.decode('utf-8'))
+
         sign = self.sign_challenge(
             message=challenge["challenge"],
             private_key=private_key,
         )
-
+        
         state = challenge["state"]
         signature = sign
 
         submit = self.submit_challenge(client_id, domain, state, signature, headers)
+
+        if isinstance(submit, bytes):
+            submit = json.loads(submit.decode('utf-8'))
+
         return submit