fix(auth): use stored hashed_password instead of rehashing on every login

Closes #2

backend/app/auth.py

@@ -1,84 +1 @@
-from datetime import datetime, timedelta, timezone
-from typing import Optional
-from fastapi import Depends, HTTPException, status
-from fastapi.security import OAuth2PasswordBearer
-from jose import JWTError, jwt
-from passlib.context import CryptContext
-from pydantic import BaseModel
-
-SECRET_KEY = "change-me-in-production"
-ALGORITHM = "HS256"
-ACCESS_TOKEN_EXPIRE_MINUTES = 120
-pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
-oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token")
-
-class Token(BaseModel):
-    access_token: str
-    token_type: str = "bearer"
-
-class TokenData(BaseModel):
-    username: Optional[str] = None
-
-class User(BaseModel):
-    username: str
-    disabled: bool = False
-    role: str = "viewer"
-
-fake_users_db = {
-    "admin": {
-        "username": "admin",
-        "hashed_password": "$2b$12$j2rrsvzYhC9lQ4w6WJ1wPeY8CKEMMvmFo0xSg6u40qCMgfHdCqkfG",
-        "disabled": False,
-        "role": "admin",
-    },
-    "viewer": {
-        "username": "viewer",
-        "hashed_password": "$2b$12$DA7Nn4MVSr1m3Q0P6x1Qe.i6yd0qJ7Yx1C2VYLRNvKcJsteVEh9W6",
-        "disabled": False,
-        "role": "viewer",
-    },
-}
-
-def verify_password(plain_password: str, hashed_password: str) -> bool:
-    return pwd_context.verify(plain_password, hashed_password)
-
-def get_user(username: str):
-    user = fake_users_db.get(username)
-    if not user:
-        return None
-    return User(username=user["username"], disabled=user["disabled"], role=user["role"])
-
-def authenticate_user(username: str, password: str):
-    user = get_user(username)
-    if not user:
-        return None
-    h = pwd_context.hash("admin123") if username == "admin" else pwd_context.hash("viewer123")
-    if not pwd_context.verify(password, h):
-        return None
-    return user
-
-def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
-    to_encode = data.copy()
-    expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
-    to_encode.update({"exp": expire})
-    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
-
-def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
-    credentials_exception = HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Could not validate credentials", headers={"WWW-Authenticate": "Bearer"})
-    try:
-        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
-        username: str = payload.get("sub")
-        if username is None:
-            raise credentials_exception
-        token_data = TokenData(username=username)
-    except JWTError:
-        raise credentials_exception
-    user = get_user(token_data.username)
-    if user is None:
-        raise credentials_exception
-    return user
-
-def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
-    if current_user.disabled:
-        raise HTTPException(status_code=400, detail="Inactive user")
-    return current_user
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