mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
138 lines
3.4 KiB
Go
138 lines
3.4 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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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 reverseproxy
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import (
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"encoding/json"
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"flag"
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"log"
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"net/http"
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"net/url"
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"strings"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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caddycmd "github.com/caddyserver/caddy/v2/cmd"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
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"github.com/mholt/certmagic"
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)
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func init() {
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caddycmd.RegisterCommand(caddycmd.Command{
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Name: "reverse-proxy",
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Func: cmdReverseProxy,
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Usage: "[--from <addr>] [--to <addr>]",
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Short: "A quick and production-ready reverse proxy",
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Long: `
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A simple but production-ready reverse proxy. Useful for quick deployments,
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demos, and development.
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Simply shuttles HTTP traffic from the --from address to the --to address.
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If the --from address has a domain name, Caddy will attempt to serve the
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proxy over HTTPS with a certificate.
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`,
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Flags: func() *flag.FlagSet {
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fs := flag.NewFlagSet("file-server", flag.ExitOnError)
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fs.String("from", "", "Address to receive traffic on")
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fs.String("to", "", "Upstream address to proxy traffic to")
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return fs
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}(),
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})
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}
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func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
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from := fs.String("from")
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to := fs.String("to")
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if from == "" {
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from = "localhost:" + httpcaddyfile.DefaultPort
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}
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if !strings.Contains(from, "://") {
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from = "http://" + from
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}
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fromURL, err := url.Parse(from)
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if err != nil {
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fromURL.Host = from
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}
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toURL, err := url.Parse(to)
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if err != nil {
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toURL.Host = to
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}
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ht := HTTPTransport{}
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if toURL.Scheme == "https" {
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ht.TLS = new(TLSConfig)
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}
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handler := Handler{
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TransportRaw: caddyconfig.JSONModuleObject(ht, "protocol", "http", nil),
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Upstreams: UpstreamPool{{Dial: toURL.Host}},
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Headers: &headers.Handler{
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Request: &headers.HeaderOps{
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Set: http.Header{
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"Host": []string{"{http.handlers.reverse_proxy.upstream.host}"},
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},
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},
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},
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}
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route := caddyhttp.Route{
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HandlersRaw: []json.RawMessage{
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caddyconfig.JSONModuleObject(handler, "handler", "reverse_proxy", nil),
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},
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}
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if fromURL.Hostname() != "" {
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route.MatcherSetsRaw = []map[string]json.RawMessage{
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map[string]json.RawMessage{
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"host": caddyconfig.JSON(caddyhttp.MatchHost{fromURL.Hostname()}, nil),
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},
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}
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}
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listen := ":" + httpcaddyfile.DefaultPort
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if certmagic.HostQualifies(fromURL.Hostname()) {
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listen = ":443"
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}
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server := &caddyhttp.Server{
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Routes: caddyhttp.RouteList{route},
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Listen: []string{listen},
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}
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httpApp := caddyhttp.App{
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Servers: map[string]*caddyhttp.Server{"proxy": server},
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}
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cfg := &caddy.Config{
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AppsRaw: map[string]json.RawMessage{
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"http": caddyconfig.JSON(httpApp, nil),
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},
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}
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err = caddy.Run(cfg)
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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log.Printf("Caddy 2 proxying from %s to %s", from, to)
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select {}
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}
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