From ab885f07b844fd60adb9d49ed7884f3cd2d939a7 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Fri, 9 Aug 2019 12:05:47 -0600
Subject: Implement config adapters and beginning of Caddyfile adapter

Along with several other changes, such as renaming caddyhttp.ServerRoute
to caddyhttp.Route, exporting some types that were not exported before,
and tweaking the caddytls TLS values to be more consistent.

Notably, we also now disable automatic cert management for names which
already have a cert (manually) loaded into the cache. These names no
longer need to be specified in the "skip_certificates" field of the
automatic HTTPS config, because they will be skipped automatically.
---
 modules/caddyhttp/headers/caddyfile.go | 92 ++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 modules/caddyhttp/headers/caddyfile.go

(limited to 'modules/caddyhttp/headers')

diff --git a/modules/caddyhttp/headers/caddyfile.go b/modules/caddyhttp/headers/caddyfile.go
new file mode 100644
index 0000000..03f9e68
--- /dev/null
+++ b/modules/caddyhttp/headers/caddyfile.go
@@ -0,0 +1,92 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package headers
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/caddyserver/caddy/caddyconfig/caddyfile"
+	"github.com/caddyserver/caddy/caddyconfig/httpcaddyfile"
+)
+
+// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
+//
+//     headers [<matcher>] [[+|-]<field> <value>] {
+//         [+][<field>] [<value>]
+//         [-<field>]
+//     }
+//
+// Either a block can be opened or a single header field can be configured
+// in the first line, but not both in the same directive.
+func (h *Headers) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	for d.Next() {
+		// first see if headers are in the initial line
+		var hasArgs bool
+		if d.NextArg() {
+			hasArgs = true
+			field := d.Val()
+			d.NextArg()
+			value := d.Val()
+			h.processCaddyfileLine(field, value)
+		}
+
+		// if not, they should be in a block
+		for d.NextBlock() {
+			if hasArgs {
+				return d.Err("cannot specify headers in both arguments and block")
+			}
+			field := d.Val()
+			var value string
+			if d.NextArg() {
+				value = d.Val()
+			}
+			h.processCaddyfileLine(field, value)
+		}
+	}
+	return nil
+}
+
+func (h *Headers) processCaddyfileLine(field, value string) {
+	if strings.HasPrefix(field, "+") {
+		if h.Response == nil {
+			h.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
+		}
+		if h.Response.Add == nil {
+			h.Response.Add = make(http.Header)
+		}
+		h.Response.Add.Set(field[1:], value)
+	} else if strings.HasPrefix(field, "-") {
+		if h.Response == nil {
+			h.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
+		}
+		h.Response.Delete = append(h.Response.Delete, field[1:])
+		h.Response.Deferred = true
+	} else {
+		if h.Response == nil {
+			h.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
+		}
+		if h.Response.Set == nil {
+			h.Response.Set = make(http.Header)
+		}
+		h.Response.Set.Set(field, value)
+	}
+}
+
+// Bucket returns the HTTP Caddyfile handler bucket number.
+func (h Headers) Bucket() int { return 3 }
+
+// Interface guard
+var _ httpcaddyfile.HandlerDirective = (*Headers)(nil)
-- 
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