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httputil.go
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httputil.go
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package httputil
import (
"net/http"
"strings"
)
// IsHttps is a helper function that evaluates the http.Request
// and returns True if the Request uses HTTPS. It is able to detect,
// using the X-Forwarded-Proto, if the original request was HTTPS and
// routed through a reverse proxy with SSL termination.
func IsHttps(r *http.Request) bool {
switch {
case r.URL.Scheme == "https":
return true
case r.TLS != nil:
return true
case strings.HasPrefix(r.Proto, "HTTPS"):
return true
case r.Header.Get("X-Forwarded-Proto") == "https":
return true
default:
return false
}
}
// GetScheme is a helper function that evaluates the http.Request
// and returns the scheme, HTTP or HTTPS. It is able to detect,
// using the X-Forwarded-Proto, if the original request was HTTPS
// and routed through a reverse proxy with SSL termination.
func GetScheme(r *http.Request) string {
switch {
case r.URL.Scheme == "https":
return "https"
case r.TLS != nil:
return "https"
case strings.HasPrefix(r.Proto, "HTTPS"):
return "https"
case r.Header.Get("X-Forwarded-Proto") == "https":
return "https"
default:
return "http"
}
}
// GetHost is a helper function that evaluates the http.Request
// and returns the hostname. It is able to detect, using the
// X-Forarded-For header, the original hostname when routed
// through a reverse proxy.
func GetHost(r *http.Request) string {
switch {
case len(r.Host) != 0:
return r.Host
case len(r.URL.Host) != 0:
return r.URL.Host
case len(r.Header.Get("X-Forwarded-For")) != 0:
return r.Header.Get("X-Forwarded-For")
case len(r.Header.Get("X-Host")) != 0:
return r.Header.Get("X-Host")
case len(r.Header.Get("XFF")) != 0:
return r.Header.Get("XFF")
case len(r.Header.Get("X-Real-IP")) != 0:
return r.Header.Get("X-Real-IP")
default:
return "localhost:8080"
}
}
// GetURL is a helper function that evaluates the http.Request
// and returns the URL as a string. Only the scheme + hostname
// are included; the path is excluded.
func GetURL(r *http.Request) string {
return GetScheme(r) + "://" + GetHost(r)
}
// GetCookie retrieves and verifies the cookie value.
func GetCookie(r *http.Request, name string) (value string) {
cookie, err := r.Cookie(name)
if err != nil {
return
}
value = cookie.Value
return
}
// SetCookie writes the cookie value.
func SetCookie(w http.ResponseWriter, r *http.Request, name, value string) {
cookie := http.Cookie{
Name: name,
Value: value,
Path: "/",
Domain: r.URL.Host,
HttpOnly: true,
Secure: IsHttps(r),
MaxAge: 2147483647, // the cooke value (token) is responsible for expiration
}
http.SetCookie(w, &cookie)
}
// DelCookie deletes a cookie.
func DelCookie(w http.ResponseWriter, r *http.Request, name string) {
cookie := http.Cookie{
Name: name,
Value: "deleted",
Path: "/",
Domain: r.URL.Host,
MaxAge: -1,
}
http.SetCookie(w, &cookie)
}