Golang请求中间件库？

I'm using gorrilla mux for my mux for my routing setup.

Is there any open source library that will provide some sort of request middleware?

router.HandleFunc("/products", GetProducts).Methods("GET")

So currently I have the GetProducts function that will return the products etc.

But this is a REST api that I am building, so I have to handle things like loading the user, verifying the 'api token' for the request etc.

I don't want to do this for each and every method so I was hoping I there was some request middleware when I can do this before/after execution, along with adding things like User, Permissions to the context in each middleware function.

You can use Go Gin HTTP web framework that supports middlewares as well as you want:

Using middleware:

func main() {
// Creates a router without any middleware by default
r := gin.New()

// Global middleware
// Logger middleware will write the logs to gin.DefaultWriter even you set with GIN_MODE=release.
// By default gin.DefaultWriter = os.Stdout
r.Use(gin.Logger())

// Recovery middleware recovers from any panics and writes a 500 if there was one.
r.Use(gin.Recovery())

// Per route middleware, you can add as many as you desire.
r.GET("/benchmark", MyBenchLogger(), benchEndpoint)

// Authorization group
// authorized := r.Group("/", AuthRequired())
// exactly the same as:
authorized := r.Group("/")
// per group middleware! in this case we use the custom created
// AuthRequired() middleware just in the "authorized" group.
authorized.Use(AuthRequired())
{
    authorized.POST("/login", loginEndpoint)
    authorized.POST("/submit", submitEndpoint)
    authorized.POST("/read", readEndpoint)

    // nested group
    testing := authorized.Group("testing")
    testing.GET("/analytics", analyticsEndpoint)
}

// Listen and serve on 0.0.0.0:8080
r.Run(":8080")
}