无法在中间件中修改/附加请求

Question

我是 nodejs 和 typescript 的新手，我想在 req.body 中添加一个新参数，比如 req.body.jwt_token。

我正在使用中间件来更新请求数据模型。 问题是我能够访问（console.log 有效）新密钥 req.body.jwt_token 只是在该功能中工作，除此之外不可访问（甚至不存在）。

我想在某个控制器中使用req.body.jwt_token。

export function httpsProtocol(req: Request, res: Response, next: NextFunction) {
    try {
        if (req.headers.authorization != undefined) {
            let authorization = req.headers.authorization;
            let authorizationArr: string[] = authorization.split('Bearer')
            if (authorizationArr[1] != undefined) {
                let jwtToken = "Bearer " + authorizationArr[1].trim();
                req.headers.Authorization = jwtToken;
                req.body.jwt_token = authorizationArr[1].trim();
                console.log(req.body.jwt_token); //able to console this
            }

        }
    } catch (error) {
        return res.status(422).json({
            message: "something goes wrong",
            error: error
        });
    }
    next();
};

请针对此问题提出解决方案。我如何在 nodejs 和 typescript 中实现这一点。我正在使用 express 作为框架

谢谢

Answer 1

? 无法在控制器中访问req.body.jwt_token 的唯一原因是，在设置值之前，您是next()。

??‍? 确保在if/else 条件中添加您的next()。所以，你可以复制下面的代码?并使用它：

export function httpsProtocol(req: Request, res: Response, next: NextFunction) {
  try {
      if (req.headers.authorization != undefined) {
          let authorization = req.headers.authorization;
          let authorizationArr: string[] = authorization.split('Bearer')
          if (authorizationArr[1] != undefined) {
              let jwtToken = "Bearer " + authorizationArr[1].trim();
              req.headers.Authorization = jwtToken;
              req.body.jwt_token = authorizationArr[1].trim();
              console.log(req.body.jwt_token); //able to console this
              // your next here
              next();
          } else {
            next(); // next or do some stuff
          }
      } else {
          next(); // next or do some stuff
      }
  } catch (error) {
      return res.status(422).json({
          message: "something goes wrong",
          error: error
      });
  }
  // next(); your next here only make your req.body.jwt_token is undefined
};

也许这个答案会帮助你知道原因：passing value from middleware to controller in restify using req.data is not working?

希望对你有帮助?。