From 2f684e42d5b8b78fe688b2f7e31d54d2333c0701 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Fri, 20 Sep 2019 13:13:49 -0600
Subject: reverse_proxy/headers: Expose header replacement ability in Caddyfile

Adds header_up and header_down subdirectives to reverse_proxy
---
 modules/caddyhttp/reverseproxy/caddyfile.go | 45 +++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'modules/caddyhttp/reverseproxy/caddyfile.go')

diff --git a/modules/caddyhttp/reverseproxy/caddyfile.go b/modules/caddyhttp/reverseproxy/caddyfile.go
index d8c63b4..83298d8 100644
--- a/modules/caddyhttp/reverseproxy/caddyfile.go
+++ b/modules/caddyhttp/reverseproxy/caddyfile.go
@@ -25,6 +25,7 @@ import (
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
 	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
+	"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
 	"github.com/dustin/go-humanize"
 )
 
@@ -67,6 +68,10 @@ func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error)
 //         unhealthy_status <status>
 //         unhealthy_latency <duration>
 //
+//         # header manipulation
+//         header_up   [+|-]<field> [<value|regexp> [<replacement>]]
+//         header_down [+|-]<field> [<value|regexp> [<replacement>]]
+//
 //         # round trip
 //         transport <name> {
 //             ...
@@ -327,6 +332,46 @@ func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				}
 				h.HealthChecks.Passive.UnhealthyLatency = caddy.Duration(dur)
 
+			case "header_up":
+				if h.Headers == nil {
+					h.Headers = new(headers.Handler)
+				}
+				if h.Headers.Request == nil {
+					h.Headers.Request = new(headers.HeaderOps)
+				}
+				args := d.RemainingArgs()
+				switch len(args) {
+				case 1:
+					headers.CaddyfileHeaderOp(h.Headers.Request, args[0], "", "")
+				case 2:
+					headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], "")
+				case 3:
+					headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], args[2])
+				default:
+					return d.ArgErr()
+				}
+
+			case "header_down":
+				if h.Headers == nil {
+					h.Headers = new(headers.Handler)
+				}
+				if h.Headers.Response == nil {
+					h.Headers.Response = &headers.RespHeaderOps{
+						HeaderOps: new(headers.HeaderOps),
+					}
+				}
+				args := d.RemainingArgs()
+				switch len(args) {
+				case 1:
+					headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], "", "")
+				case 2:
+					headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], "")
+				case 3:
+					headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], args[2])
+				default:
+					return d.ArgErr()
+				}
+
 			case "transport":
 				if !d.NextArg() {
 					return d.ArgErr()
-- 
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