add new ui

backend/security.py

@@ -0,0 +1,79 @@
+import os
+from datetime import datetime, timedelta, timezone
+from typing import Optional, Callable, Iterable
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from . import models
+from .database import get_db
+
+
+SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-change-me")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "60"))
+
+# Use pbkdf2_sha256 to avoid external bcrypt backend issues
+pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token")
+
+
+def verify_password(plain_password: str, password_hash: str) -> bool:
+    return pwd_context.verify(plain_password, password_hash)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+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_user_by_username(db: Session, username: str) -> Optional[models.User]:
+    return db.query(models.User).filter(models.User.username == username).first()
+
+
+def authenticate_user(db: Session, username: str, password: str) -> Optional[models.User]:
+    user = get_user_by_username(db, username)
+    if not user:
+        return None
+    if not verify_password(password, user.password_hash):
+        return None
+    return user
+
+
+async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> models.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
+    except JWTError:
+        raise credentials_exception
+    user = get_user_by_username(db, username=username)
+    if user is None:
+        raise credentials_exception
+    return user
+
+
+def require_roles(allowed_roles: Iterable[str]) -> Callable[[models.User], models.User]:
+    allowed = set(allowed_roles)
+
+    def _dependency(user: models.User = Depends(get_current_user)) -> models.User:
+        if user.role not in allowed:
+            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Insufficient permissions")
+        return user
+
+    return _dependency