feat(api): Implement JWT utility functions and configuration

src/ea_chatbot/api/utils.py

@@ -0,0 +1,43 @@
+from datetime import datetime, timedelta, timezone
+from typing import Optional, Union
+from jose import JWTError, jwt
+from ea_chatbot.config import Settings
+
+settings = Settings()
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """
+    Create a JWT access token.
+    
+    Args:
+        data: The payload data to encode.
+        expires_delta: Optional expiration time delta.
+        
+    Returns:
+        str: The encoded JWT token.
+    """
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.now(timezone.utc) + expires_delta
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
+    
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
+    return encoded_jwt
+
+def decode_access_token(token: str) -> Optional[dict]:
+    """
+    Decode a JWT access token.
+    
+    Args:
+        token: The token to decode.
+        
+    Returns:
+        Optional[dict]: The decoded payload if valid, None otherwise.
+    """
+    try:
+        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
+        return payload
+    except JWTError:
+        return None