Update auth.py

auth.py

@@ -0,0 +1,40 @@
+import jwt
+import datetime
+from passlib.hash import bcrypt
+from storage import get_user, add_user
+from fastapi import HTTPException
+
+SECRET_KEY = "your-secret-key-keep-it-safe"  # Change this in production!
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+def verify_password(plain_password, hashed_password):
+    return bcrypt.verify(plain_password, hashed_password)
+
+def get_password_hash(password):
+    return bcrypt.hash(password)
+
+def create_access_token(data: dict, expires_delta: datetime.timedelta = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.datetime.utcnow() + datetime.timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+def authenticate_user(username: str, password: str):
+    user = get_user(username)
+    if not user:
+        return False
+    if not verify_password(password, user["password"]):
+        return False
+    return user
+
+def register_user(username: str, password: str):
+    if get_user(username):
+        raise HTTPException(status_code=400, detail="Username already registered")
+    hashed_password = get_password_hash(password)
+    add_user(username, hashed_password)
+    return {"username": username, "message": "User created successfully"}