我試圖在我的 Lambda 中創(chuàng)建一個身份驗證中間件，它基本上在結構user中注入一個屬性ctx，并調用處理函數。我是怎么做的：中間件/authentication.go：package middlewaresimport (    "context"    "github.com/aws/aws-lambda-go/events"    "github.com/passus/api/models")func Authentication(next MiddlewareSignature) MiddlewareSignature {    user := models.User{}    return func(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {        claims := request.RequestContext.Authorizer["claims"]        // Find user by claims properties.        if err := user.Current(claims); err != nil {            return events.APIGatewayProxyResponse{}, err        }        // Augment ctx with user property.        ctx = context.WithValue(ctx, "user", user)        return next(ctx, request)    }}我的 lambda.go:package mainimport (    "context"    "fmt"    "github.com/aws/aws-lambda-go/events"    "github.com/aws/aws-lambda-go/lambda"    "github.com/passus/api/middlewares")func Handler(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {    fmt.Println(ctx.user)    return events.APIGatewayProxyResponse{}, nil}func main() {    lambda.Start(        middlewares.Authentication(Handler),    )}這種方法的問題在于：它不起作用。我在嘗試構建它時看到以下錯誤：create/main.go:13:17: ctx.user undefined (type context.Context has no field or method user)先感謝您。