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backend/auth.py

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+import logging
+from datetime import datetime, timedelta
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+
+logger = logging.getLogger("app")
+
+SECRET_KEY = "changethis"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 30  # 1 month
+
+pwd_context = CryptContext(schemes=["bcrypt"])
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+def create_access_token(user_id: str) -> str:
+    expire = datetime.now() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    return jwt.encode({"sub": user_id, "exp": expire}, SECRET_KEY, algorithm=ALGORITHM)
+
+def decode_access_token(token: str) -> str | None:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        return payload.get("sub")
+    except JWTError:
+        return None