How to pass param from middleware to controller

Question

I am building a web API with Echo Labstack framework. I have a middleware in my route to check for user authentication, but then I am having difficulty in passing the data to controller and could not find anything about this in Google and SO.

routes.go

func Routes(e *echo.Echo) {
    e.(middlewareAuthorise)
    user := e.Group("/user")
    user.GET("/profile", controllers.UserProfile)
}

func middlewareAuthorise(next echo.HandlerFunc) echo.HandlerFunc {
    return func(c echo.Context) error {
        // Do some authentication here with access token and get user ID
        auth := controllers.Auth(c, 1)
        if auth["status"] != 200 {
            return c.JSON(401, map[string]any{"status": 401})
        }

        user_id := auth["user_id"]
        // I want to pass user_id to my controllers
        return next(c, user_id)
    }
}

contollers.go

func UserProfile(c echo.Context) error {
    // I want to get the user_id here from middleware
    return c.JSON(200, map[string]any{
        "user_id": user_id,
    })
}

I have searched and tried several combinations for a whole day but couldn't find something that works. How do I pass the param from middleware to my controllers in the most efficient way possible?

Answer 1

You can use the context's Set and Get methods.