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83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
// Copyright 2022 Harness Inc. All rights reserved.
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// Use of this source code is governed by the Polyform Free Trial License
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// that can be found in the LICENSE.md file for this repository.
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package address
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import (
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"net/http"
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"strings"
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)
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// Handler returns an http.HandlerFunc middleware that sets
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// the http.Request scheme and hostname.
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func Handler(scheme, host string) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// update the scheme and host for the inbound
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// http.Request so they are available to subsequent
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// handlers in the chain.
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r.URL.Scheme = scheme
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r.URL.Host = host
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// if the scheme is not configured, attempt to ascertain
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// the scheme from the inbound http.Request.
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if r.URL.Scheme == "" {
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r.URL.Scheme = resolveScheme(r)
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}
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// if the host is not configured, attempt to ascertain
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// the host from the inbound http.Request.
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if r.URL.Host == "" {
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r.URL.Host = resolveHost(r)
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}
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// invoke the next handler in the chain.
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next.ServeHTTP(w, r)
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})
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}
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}
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// resolveScheme 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 resolveScheme(r *http.Request) string {
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const https = "https"
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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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// resolveHost 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 resolveHost(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:3000"
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}
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}
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