initialer commit, Grundcode

backend/auth.py

@@ -0,0 +1,66 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+import os
+
+import models
+from database import get_db
+
+SECRET_KEY = os.environ.get(
+    "SECRET_KEY", "insecure-default-key-change-in-production-use-env-var"
+)
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7  # 7 days
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/token")
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+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.utcnow() + (
+        expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    )
+    to_encode["exp"] = expire
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def get_current_user(
+    token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)
+) -> models.User:
+    exc = 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 not username:
+            raise exc
+    except JWTError:
+        raise exc
+    user = db.query(models.User).filter(models.User.username == username).first()
+    if not user:
+        raise exc
+    return user
+
+
+def get_current_admin(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    if not current_user.is_admin:
+        raise HTTPException(status_code=403, detail="Admin access required")
+    return current_user