add backend source code

backend/app/core/security.py

@@ -0,0 +1,109 @@
+"""
+安全认证模块
+"""
+from datetime import datetime, timedelta
+from typing import Any, Optional, Annotated
+from jose import jwt, JWTError
+import bcrypt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.core.config import settings
+from app.core.database import get_db
+from app.models.models import User
+
+
+# 密码加密直接使用 bcrypt
+
+# OAuth2 密码模式
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_PREFIX}/auth/login")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """验证密码"""
+    return bcrypt.checkpw(plain_password.encode('utf-8'), hashed_password.encode('utf-8'))
+
+
+def get_password_hash(password: str) -> str:
+    """生成密码哈希"""
+    return bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')
+
+
+def create_access_token(subject: str | Any, expires_delta: Optional[timedelta] = None) -> str:
+    """创建访问令牌"""
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def decode_token(token: str) -> Optional[dict]:
+    """解码令牌"""
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        return payload
+    except JWTError:
+        return None
+
+
+async def get_current_user(
+    token: Annotated[str, Depends(oauth2_scheme)],
+    db: AsyncSession = Depends(get_db)
+) -> User:
+    """从JWT获取当前用户"""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="无法验证凭据",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    payload = decode_token(token)
+    if payload is None:
+        raise credentials_exception
+    
+    user_id: str = payload.get("sub")
+    if user_id is None:
+        raise credentials_exception
+    
+    result = await db.execute(
+        select(User).where(User.id == int(user_id))
+    )
+    user = result.scalar_one_or_none()
+    
+    if user is None:
+        raise credentials_exception
+    
+    return user
+
+
+async def get_current_active_user(
+    current_user: Annotated[User, Depends(get_current_user)]
+) -> User:
+    """验证当前用户是否激活"""
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="用户已被禁用")
+    return current_user
+
+
+async def get_current_admin_user(
+    current_user: Annotated[User, Depends(get_current_active_user)]
+) -> User:
+    """验证当前用户是否为管理员"""
+    if current_user.role != "admin":
+        raise HTTPException(status_code=403, detail="需要管理员权限")
+    return current_user
+
+
+async def get_current_manager_user(
+    current_user: Annotated[User, Depends(get_current_active_user)]
+) -> User:
+    """验证当前用户是否为管理员或经理"""
+    if current_user.role not in ("admin", "manager"):
+        raise HTTPException(status_code=403, detail="需要管理员或经理权限")
+    return current_user