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redirect.go
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redirect.go
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package middleware
import (
"errors"
"net/http"
"strings"
"github.com/datumforge/echox"
)
// RedirectConfig defines the config for Redirect middleware.
type RedirectConfig struct {
// Skipper defines a function to skip middleware.
Skipper
// Status code to be used when redirecting the request.
// Optional. Default value http.StatusMovedPermanently.
Code int
redirect redirectLogic
}
// redirectLogic represents a function that given a scheme, host and uri
// can both: 1) determine if redirect is needed (will set ok accordingly) and
// 2) return the appropriate redirect url.
type redirectLogic func(scheme, host, uri string) (ok bool, url string)
const www = "www."
// RedirectHTTPSConfig is the HTTPS Redirect middleware config.
var RedirectHTTPSConfig = RedirectConfig{redirect: redirectHTTPS}
// RedirectHTTPSWWWConfig is the HTTPS WWW Redirect middleware config.
var RedirectHTTPSWWWConfig = RedirectConfig{redirect: redirectHTTPSWWW}
// RedirectNonHTTPSWWWConfig is the non HTTPS WWW Redirect middleware config.
var RedirectNonHTTPSWWWConfig = RedirectConfig{redirect: redirectNonHTTPSWWW}
// RedirectWWWConfig is the WWW Redirect middleware config.
var RedirectWWWConfig = RedirectConfig{redirect: redirectWWW}
// RedirectNonWWWConfig is the non WWW Redirect middleware config.
var RedirectNonWWWConfig = RedirectConfig{redirect: redirectNonWWW}
// HTTPSRedirect redirects http requests to https.
// For example, http://labstack.com will be redirect to https://labstack.com.
//
// Usage `Echo#Pre(HTTPSRedirect())`
func HTTPSRedirect() echox.MiddlewareFunc {
return HTTPSRedirectWithConfig(RedirectHTTPSConfig)
}
// HTTPSRedirectWithConfig returns a HTTPS redirect middleware with config or panics on invalid configuration.
func HTTPSRedirectWithConfig(config RedirectConfig) echox.MiddlewareFunc {
config.redirect = redirectHTTPS
return toMiddlewareOrPanic(config)
}
// HTTPSWWWRedirect redirects http requests to https www.
// For example, http://labstack.com will be redirect to https://www.labstack.com.
//
// Usage `Echo#Pre(HTTPSWWWRedirect())`
func HTTPSWWWRedirect() echox.MiddlewareFunc {
return HTTPSWWWRedirectWithConfig(RedirectHTTPSWWWConfig)
}
// HTTPSWWWRedirectWithConfig returns a HTTPS WWW redirect middleware with config or panics on invalid configuration.
func HTTPSWWWRedirectWithConfig(config RedirectConfig) echox.MiddlewareFunc {
config.redirect = redirectHTTPSWWW
return toMiddlewareOrPanic(config)
}
// HTTPSNonWWWRedirect redirects http requests to https non www.
// For example, http://www.labstack.com will be redirect to https://labstack.com.
//
// Usage `Echo#Pre(HTTPSNonWWWRedirect())`
func HTTPSNonWWWRedirect() echox.MiddlewareFunc {
return HTTPSNonWWWRedirectWithConfig(RedirectNonHTTPSWWWConfig)
}
// HTTPSNonWWWRedirectWithConfig returns a HTTPS Non-WWW redirect middleware with config or panics on invalid configuration.
func HTTPSNonWWWRedirectWithConfig(config RedirectConfig) echox.MiddlewareFunc {
config.redirect = redirectNonHTTPSWWW
return toMiddlewareOrPanic(config)
}
// WWWRedirect redirects non www requests to www.
// For example, http://labstack.com will be redirect to http://www.labstack.com.
//
// Usage `Echo#Pre(WWWRedirect())`
func WWWRedirect() echox.MiddlewareFunc {
return WWWRedirectWithConfig(RedirectWWWConfig)
}
// WWWRedirectWithConfig returns a WWW redirect middleware with config or panics on invalid configuration.
func WWWRedirectWithConfig(config RedirectConfig) echox.MiddlewareFunc {
config.redirect = redirectWWW
return toMiddlewareOrPanic(config)
}
// NonWWWRedirect redirects www requests to non www.
// For example, http://www.labstack.com will be redirect to http://labstack.com.
//
// Usage `Echo#Pre(NonWWWRedirect())`
func NonWWWRedirect() echox.MiddlewareFunc {
return NonWWWRedirectWithConfig(RedirectNonWWWConfig)
}
// NonWWWRedirectWithConfig returns a Non-WWW redirect middleware with config or panics on invalid configuration.
func NonWWWRedirectWithConfig(config RedirectConfig) echox.MiddlewareFunc {
config.redirect = redirectNonWWW
return toMiddlewareOrPanic(config)
}
// ToMiddleware converts RedirectConfig to middleware or returns an error for invalid configuration
func (config RedirectConfig) ToMiddleware() (echox.MiddlewareFunc, error) {
if config.Skipper == nil {
config.Skipper = DefaultSkipper
}
if config.Code == 0 {
config.Code = http.StatusMovedPermanently
}
if config.redirect == nil {
return nil, errors.New("redirectConfig is missing redirect function")
}
return func(next echox.HandlerFunc) echox.HandlerFunc {
return func(c echox.Context) error {
if config.Skipper(c) {
return next(c)
}
req, scheme := c.Request(), c.Scheme()
host := req.Host
if ok, url := config.redirect(scheme, host, req.RequestURI); ok {
return c.Redirect(config.Code, url)
}
return next(c)
}
}, nil
}
var redirectHTTPS = func(scheme, host, uri string) (bool, string) {
if scheme != "https" {
return true, "https://" + host + uri
}
return false, ""
}
var redirectHTTPSWWW = func(scheme, host, uri string) (bool, string) {
if scheme != "https" && !strings.HasPrefix(host, www) {
return true, "https://www." + host + uri
}
return false, ""
}
var redirectNonHTTPSWWW = func(scheme, host, uri string) (ok bool, url string) {
if scheme != "https" {
host = strings.TrimPrefix(host, www)
return true, "https://" + host + uri
}
return false, ""
}
var redirectWWW = func(scheme, host, uri string) (bool, string) {
if !strings.HasPrefix(host, www) {
return true, scheme + "://www." + host + uri
}
return false, ""
}
var redirectNonWWW = func(scheme, host, uri string) (bool, string) {
if strings.HasPrefix(host, www) {
return true, scheme + "://" + host[4:] + uri
}
return false, ""
}