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// 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/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("headers", parseCaddyfile)
}
// parseCaddyfile 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 parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
hdr := new(Headers)
for h.Next() {
// first see if headers are in the initial line
var hasArgs bool
if h.NextArg() {
hasArgs = true
field := h.Val()
h.NextArg()
value := h.Val()
processCaddyfileLine(hdr, field, value)
}
// if not, they should be in a block
for h.NextBlock() {
if hasArgs {
return nil, h.Err("cannot specify headers in both arguments and block")
}
field := h.Val()
var value string
if h.NextArg() {
value = h.Val()
}
processCaddyfileLine(hdr, field, value)
}
}
return hdr, nil
}
func processCaddyfileLine(hdr *Headers, field, value string) {
if strings.HasPrefix(field, "+") {
if hdr.Response == nil {
hdr.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
}
if hdr.Response.Add == nil {
hdr.Response.Add = make(http.Header)
}
hdr.Response.Add.Set(field[1:], value)
} else if strings.HasPrefix(field, "-") {
if hdr.Response == nil {
hdr.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
}
hdr.Response.Delete = append(hdr.Response.Delete, field[1:])
hdr.Response.Deferred = true
} else {
if hdr.Response == nil {
hdr.Response = &RespHeaderOps{HeaderOps: new(HeaderOps)}
}
if hdr.Response.Set == nil {
hdr.Response.Set = make(http.Header)
}
hdr.Response.Set.Set(field, value)
}
}
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