126 lines
3.4 KiB
Go
126 lines
3.4 KiB
Go
// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package httputil
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import (
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"net/http"
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"strings"
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)
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// IsHttps is a helper function that evaluates the http.Request
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// and returns True if the Request uses HTTPS. It is able to detect,
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// using the X-Forwarded-Proto, if the original request was HTTPS and
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// routed through a reverse proxy with SSL termination.
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func IsHttps(r *http.Request) bool {
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switch {
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case r.URL.Scheme == "https":
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return true
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case r.TLS != nil:
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return true
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case strings.HasPrefix(r.Proto, "HTTPS"):
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return true
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case r.Header.Get("X-Forwarded-Proto") == "https":
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return true
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default:
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return false
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}
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}
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// GetScheme is a helper function that evaluates the http.Request
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// and returns the scheme, HTTP or HTTPS. It is able to detect,
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// using the X-Forwarded-Proto, if the original request was HTTPS
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// and routed through a reverse proxy with SSL termination.
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func GetScheme(r *http.Request) string {
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switch {
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case r.URL.Scheme == "https":
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return "https"
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case r.TLS != nil:
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return "https"
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case strings.HasPrefix(r.Proto, "HTTPS"):
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return "https"
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case r.Header.Get("X-Forwarded-Proto") == "https":
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return "https"
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default:
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return "http"
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}
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}
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// GetHost is a helper function that evaluates the http.Request
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// and returns the hostname. It is able to detect, using the
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// X-Forarded-For header, the original hostname when routed
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// through a reverse proxy.
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func GetHost(r *http.Request) string {
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switch {
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case len(r.Host) != 0:
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return r.Host
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case len(r.URL.Host) != 0:
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return r.URL.Host
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case len(r.Header.Get("X-Forwarded-For")) != 0:
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return r.Header.Get("X-Forwarded-For")
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case len(r.Header.Get("X-Host")) != 0:
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return r.Header.Get("X-Host")
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case len(r.Header.Get("XFF")) != 0:
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return r.Header.Get("XFF")
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case len(r.Header.Get("X-Real-IP")) != 0:
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return r.Header.Get("X-Real-IP")
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default:
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return "localhost:8080"
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}
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}
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// GetURL is a helper function that evaluates the http.Request
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// and returns the URL as a string. Only the scheme + hostname
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// are included; the path is excluded.
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func GetURL(r *http.Request) string {
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return GetScheme(r) + "://" + GetHost(r)
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}
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// GetCookie retrieves and verifies the cookie value.
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func GetCookie(r *http.Request, name string) (value string) {
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cookie, err := r.Cookie(name)
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if err != nil {
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return
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}
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value = cookie.Value
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return
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}
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// SetCookie writes the cookie value.
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func SetCookie(w http.ResponseWriter, r *http.Request, name, value string) {
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cookie := http.Cookie{
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Name: name,
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Value: value,
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Path: "/",
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Domain: r.URL.Host,
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HttpOnly: true,
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Secure: IsHttps(r),
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MaxAge: 2147483647, // the cooke value (token) is responsible for expiration
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}
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http.SetCookie(w, &cookie)
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}
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// DelCookie deletes a cookie.
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func DelCookie(w http.ResponseWriter, r *http.Request, name string) {
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cookie := http.Cookie{
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Name: name,
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Value: "deleted",
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Path: "/",
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Domain: r.URL.Host,
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MaxAge: -1,
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}
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http.SetCookie(w, &cookie)
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}
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