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package middleware
import (
"fmt"
"net"
"net/http"
"strings"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
)
/*
WWW Redirect Middleware
This is a duplicate of existing functionality in Echo. This exists
because we don't want to prefix www to a request that is an IP address
only, only requests that use hostnames.
*/
type WWWRedirectConfig struct {
Skipper middleware.Skipper
Code int
}
var DefaultWWWRedirectConfig = WWWRedirectConfig{
Skipper: middleware.DefaultSkipper,
Code: http.StatusMovedPermanently,
}
func WWWRedirect() echo.MiddlewareFunc {
return WWWRedirectWithConfig(DefaultWWWRedirectConfig)
}
func WWWRedirectWithConfig(config WWWRedirectConfig) echo.MiddlewareFunc {
if config.Skipper == nil {
config.Skipper = DefaultWWWRedirectConfig.Skipper
}
if config.Code == 0 {
config.Code = DefaultWWWRedirectConfig.Code
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
req := c.Request()
if config.Skipper(c) || strings.HasPrefix(req.Host, "www.") {
return next(c)
}
host, _, err := net.SplitHostPort(req.Host)
if err != nil {
return echo.ErrBadRequest
}
// Never prefix an IP with www
//
// We have to parse the hostname for something that looks like an IP
// because the golang http server removes the header from the header
// map and there's no good way to unambiguously determine if this was
// a raw IP request or if a hostname was submitted.
//
// TLS connections could use the req.TLS.ServerName property which
// should have the correct hostname but there's no such thing for HTTP.
// Instead we just try to parse anything that makes it to this point
// because it should be a small one-time cost for a few requests.
if ip := net.ParseIP(host); ip != nil {
return next(c)
}
return c.Redirect(
config.Code,
fmt.Sprintf("https://www.%s%s", req.Host, req.RequestURI),
)
}
}
}
|
