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reverseproxy: Header up/down support for CLI command (#5460)

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This commit is contained in:
Francis Lavoie 2023-03-27 16:35:31 -04:00 committed by GitHub
parent 05e9974570
commit 10b265d252
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 59 additions and 5 deletions
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64
modules/caddyhttp/reverseproxy/command.go
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@ -19,6 +19,7 @@ import (
"fmt"
"net/http"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
@ -34,7 +35,7 @@ import (
func init() {
caddycmd.RegisterCommand(caddycmd.Command{
Name: "reverse-proxy",
Usage: "[--from <addr>] [--to <addr>] [--change-host-header] [--insecure] [--internal-certs] [--disable-redirects] [--access-log]",
Usage: `[--from <addr>] [--to <addr>] [--change-host-header] [--insecure] [--internal-certs] [--disable-redirects] [--header-up "Field: value"] [--header-down "Field: value"] [--access-log] [--debug]`,
Short: "A quick and production-ready reverse proxy",
Long: `
A simple but production-ready reverse proxy. Useful for quick deployments,
@ -57,8 +58,11 @@ If serving HTTPS:
CA instead of attempting to issue a public certificate.
For proxying:
--header-up can be used to set a request header to send to the upstream.
--header-down can be used to set a response header to send back to the client.
--change-host-header sets the Host header on the request to the address
of the upstream, instead of defaulting to the incoming Host header.
This is a shortcut for --header-up "Host: {http.reverse_proxy.upstream.hostport}".
--insecure disables TLS verification with the upstream. WARNING: THIS
DISABLES SECURITY BY NOT VERIFYING THE UPSTREAM'S CERTIFICATE.
`,
@ -69,6 +73,8 @@ For proxying:
cmd.Flags().BoolP("insecure", "", false, "Disable TLS verification (WARNING: DISABLES SECURITY BY NOT VERIFYING TLS CERTIFICATES!)")
cmd.Flags().BoolP("disable-redirects", "r", false, "Disable HTTP->HTTPS redirects")
cmd.Flags().BoolP("internal-certs", "i", false, "Use internal CA for issuing certs")
cmd.Flags().StringSliceP("header-up", "H", []string{}, "Set a request header to send to the upstream (format: \"Field: value\")")
cmd.Flags().StringSliceP("header-down", "d", []string{}, "Set a response header to send back to the client (format: \"Field: value\")")
cmd.Flags().BoolP("access-log", "", false, "Enable the access log")
cmd.Flags().BoolP("debug", "v", false, "Enable verbose debug logs")
cmd.RunE = caddycmd.WrapCommandFuncForCobra(cmdReverseProxy)
@ -157,16 +163,64 @@ func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
Upstreams: upstreamPool,
}
if changeHost {
// set up header_up
headerUp, err := fs.GetStringSlice("header-up")
if err != nil {
return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid header flag: %v", err)
}
if len(headerUp) > 0 {
reqHdr := make(http.Header)
for i, h := range headerUp {
key, val, found := strings.Cut(h, ":")
key, val = strings.TrimSpace(key), strings.TrimSpace(val)
if !found || key == "" || val == "" {
return caddy.ExitCodeFailedStartup, fmt.Errorf("header-up %d: invalid format \"%s\" (expecting \"Field: value\")", i, h)
}
reqHdr.Set(key, val)
}
handler.Headers = &headers.Handler{
Request: &headers.HeaderOps{
Set: http.Header{
"Host": []string{"{http.reverse_proxy.upstream.hostport}"},
},
Set: reqHdr,
},
}
}
// set up header_down
headerDown, err := fs.GetStringSlice("header-down")
if err != nil {
return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid header flag: %v", err)
}
if len(headerDown) > 0 {
respHdr := make(http.Header)
for i, h := range headerDown {
key, val, found := strings.Cut(h, ":")
key, val = strings.TrimSpace(key), strings.TrimSpace(val)
if !found || key == "" || val == "" {
return caddy.ExitCodeFailedStartup, fmt.Errorf("header-down %d: invalid format \"%s\" (expecting \"Field: value\")", i, h)
}
respHdr.Set(key, val)
}
if handler.Headers == nil {
handler.Headers = &headers.Handler{}
}
handler.Headers.Response = &headers.RespHeaderOps{
HeaderOps: &headers.HeaderOps{
Set: respHdr,
},
}
}
if changeHost {
if handler.Headers == nil {
handler.Headers = &headers.Handler{
Request: &headers.HeaderOps{
Set: http.Header{},
},
}
}
handler.Headers.Request.Set.Set("Host", "{http.reverse_proxy.upstream.hostport}")
}
route := caddyhttp.Route{
HandlersRaw: []json.RawMessage{
caddyconfig.JSONModuleObject(handler, "handler", "reverse_proxy", nil),