Source: middleware.go in package golang.org/x/pkgsite/internal/middleware

Source File
	middleware.go

Belonging Package
	golang.org/x/pkgsite/internal/middleware

Package middleware implements a simple middleware pattern for http handlers, along with implementations for some common middlewares.

package middleware

import "net/http"

A Middleware is a func that wraps an http.Handler.

type Middleware func(http.Handler) http.Handler

Chain creates a new Middleware that applies a sequence of Middlewares, so that they execute in the given order when handling an http request. In other words, Chain(m1, m2)(handler) = m1(m2(handler)) A similar pattern is used in e.g. github.com/justinas/alice: https://github.com/justinas/alice/blob/ce87934/chain.go#L45

func Chain(middlewares ...Middleware) Middleware {
	return func(h http.Handler) http.Handler {
		for i := range middlewares {
			h = middlewares[len(middlewares)-1-i](h)
		}
		return h
	}
}

Identity is a middleware that does nothing. It can be used as a helper when building middleware chains.

func Identity() Middleware {
	return func(h http.Handler) http.Handler {
		return h
	}


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