如何在午睡中覆盖某些资源的默认（“**”）装饰器？

Posted 2023-03-15

【中文标题】如何在午睡中覆盖某些资源的默认（“**”）装饰器？

【英文标题】：How to override default ("**") decorator for certain resource in siesta?

【发布时间】：2019-04-11 13:46:21

【问题描述】：

我正在尝试在服务器上将 Siesta swift 包与我的 API 一起使用。我们已经使用访问和刷新令牌设置了 JWT 身份验证。我们可以通过刷新过程成功地进行身份验证并获取新的访问令牌。但是我们提出的解决方案让我看起来有点老套。

我们正在使用这样的请求装饰器

func init() 
       service.configure("**") 
            if let session = self.appSession 
                $0.headers["Authorization"] = "Bearer \(session.tokens.access)"
            

            $0.decorateRequests 
                self.globalApiFailHandler(request: $1)
            
        

        service.configure(authRefreshResource) 
            if let session = self.appSession 
                $0.headers["Authorization-Refresh"] = "Bearer \(session.tokens.refresh)"
            

            $0.decorateRequests 
                self.refreshTokenFailure(request: $1)
            
        


private func globalApiFailHandler(request: Siesta.Request) -> Request 

        return request.chained                     //special case to Refresh Token On Auth Failure
            if case
                .failure(let error) = $0.response,  // Did request fail…
                error.httpStatusCode == 401,        // …because of expired token?
                self.appSession != nil             // we have refreshToken

                log.warning("Seems like Access Token is expired, Trying to refresh it!")
                return .passTo(
                    self.refreshAuth().chained                   // first request a new token, then:
                        if case .failure = $0.response           // If token request failed…
                            return .useThisResponse               // …report that error.
                         else 
                            return .passTo(request.repeated())    // We have a new token! Repeat the original request.
                        
                    
                )

            

            if case
                .failure(let error) = $0.response,
                error.httpStatusCode != 409 

                log.warning("Something went wrong during request: \(error)")
                self.retryLaterEvent() // TODO: Really need this here?
            

            return .useThisResponse                // If not, use the response we got.
        
    

    private func refreshTokenFailure(request: Siesta.Request) -> Request 
        return request.chained 
            if case
                .failure(let error) = $0.response   // Did request fail…

                log.error("Refresh token procedure failed with \(error).")

                if error.httpStatusCode == 409 
                    log.warning("409, Resetting app session storage! Relogin or app recreation is needed!")
                    self.relogin = true //Reset saved sessions to create new app
                    self.reloginEvent()
                 else 
                    log.warning("Something went wrong during refresh token procedure. Please retry later!")
                    self.retryLaterEvent()
                

                ///let requestError  = RequestError(userMessage: "Unable to refresh access token", cause: "")
                let response = Response.failure(error) //(requestError)
                let responseInfo = ResponseInfo(response: response)

                return .useResponse(responseInfo)                // If not, use the response we got.
            

            return .useThisResponse        // We have new token!
        
    

请注意409 返回代码检查globalApiFailHandler。它在那里是因为全局装饰器总是为authRefreshResource 调用。如果我们忽略该检查，API 将在某些服务器错误下陷入无限循环刷新令牌。

问题是如何为我们想要的特定资源禁用全局装饰器？拥有它将优雅地解决我们的问题。

【参考方案1】：

您可以将任意谓词传递给configure(whenURLMatches:)，这样您就可以外科手术般地排除您喜欢的任何东西：

service.configure(whenURLMatches:  url in url.path != "/auth" ) 
    ...

或者，如果你想排除一个你有Resource方便的URL：

service.configure(whenURLMatches:  $0 != authRefreshResource.url ) 
    ...

【讨论】：

很好，谢谢！我们很快就会试一试！