When using Gin framework for Go, I’m writing some custom middleware. One of my new middleware will evaluate if the request coming in is from my front-end SPA. If it is, I want to also use the sessions middleware to create/load the user session info. If it is not, then I don’t want to call that middleware.

I can’t seem to find how (if possible) to do this. I was hoping I could either use an IF block when I’m defining my router.Use(xyz) statements, or better yet, tell my current middleware to load another one before I call the c.Next().

Example:

func MyMiddleware(c *gin.Context) {
    isFromFrontend := myFunctionToDetermine()
    c.Set("isFromFrontend", isFromFrontend)
    if isFromFrontend {
        <here is where i'd like to effectively call r.Use() again and pass the session middleware>
    }
    c.Next()
}

r := gin.Default()
r.Use(MyMiddleware)

I tried the other method of defining middleware where I:

1. created a new function for MyMiddleware that accepts an instance of the router, so that I can try to call the .Use() method again from within my middleware; it doesn’t error but it also doesn’t seem to call it. I’m guessing that the middleware chain is already established before it is evaluated?

Is there a way to add a new middleware to the existing chain before it finishes processing?

Or is there maybe some other entirely different way to accomplish what I’m doing?