mirror of https://github.com/caddyserver/caddy.git
132 lines
3.7 KiB
Go
132 lines
3.7 KiB
Go
// 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"
|
|
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
|
|
)
|
|
|
|
func init() {
|
|
caddy.RegisterModule(Headers{})
|
|
}
|
|
|
|
// Headers is a middleware which can mutate HTTP headers.
|
|
type Headers struct {
|
|
Request *HeaderOps `json:"request,omitempty"`
|
|
Response *RespHeaderOps `json:"response,omitempty"`
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (Headers) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
Name: "http.handlers.headers",
|
|
New: func() caddy.Module { return new(Headers) },
|
|
}
|
|
}
|
|
|
|
// HeaderOps defines some operations to
|
|
// perform on HTTP headers.
|
|
type HeaderOps struct {
|
|
Add http.Header `json:"add,omitempty"`
|
|
Set http.Header `json:"set,omitempty"`
|
|
Delete []string `json:"delete,omitempty"`
|
|
}
|
|
|
|
// RespHeaderOps is like HeaderOps, but
|
|
// optionally deferred until response time.
|
|
type RespHeaderOps struct {
|
|
*HeaderOps
|
|
Require *caddyhttp.ResponseMatcher `json:"require,omitempty"`
|
|
Deferred bool `json:"deferred,omitempty"`
|
|
}
|
|
|
|
func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
|
|
apply(h.Request, r.Header, repl)
|
|
if h.Response != nil {
|
|
if h.Response.Deferred || h.Response.Require != nil {
|
|
w = &responseWriterWrapper{
|
|
ResponseWriterWrapper: &caddyhttp.ResponseWriterWrapper{ResponseWriter: w},
|
|
replacer: repl,
|
|
require: h.Response.Require,
|
|
headerOps: h.Response.HeaderOps,
|
|
}
|
|
} else {
|
|
apply(h.Response.HeaderOps, w.Header(), repl)
|
|
}
|
|
}
|
|
return next.ServeHTTP(w, r)
|
|
}
|
|
|
|
func apply(ops *HeaderOps, hdr http.Header, repl caddy.Replacer) {
|
|
if ops == nil {
|
|
return
|
|
}
|
|
for fieldName, vals := range ops.Add {
|
|
fieldName = repl.ReplaceAll(fieldName, "")
|
|
for _, v := range vals {
|
|
hdr.Add(fieldName, repl.ReplaceAll(v, ""))
|
|
}
|
|
}
|
|
for fieldName, vals := range ops.Set {
|
|
fieldName = repl.ReplaceAll(fieldName, "")
|
|
for i := range vals {
|
|
vals[i] = repl.ReplaceAll(vals[i], "")
|
|
}
|
|
hdr.Set(fieldName, strings.Join(vals, ","))
|
|
}
|
|
for _, fieldName := range ops.Delete {
|
|
hdr.Del(repl.ReplaceAll(fieldName, ""))
|
|
}
|
|
}
|
|
|
|
// responseWriterWrapper defers response header
|
|
// operations until WriteHeader is called.
|
|
type responseWriterWrapper struct {
|
|
*caddyhttp.ResponseWriterWrapper
|
|
replacer caddy.Replacer
|
|
require *caddyhttp.ResponseMatcher
|
|
headerOps *HeaderOps
|
|
wroteHeader bool
|
|
}
|
|
|
|
func (rww *responseWriterWrapper) WriteHeader(status int) {
|
|
if rww.wroteHeader {
|
|
return
|
|
}
|
|
rww.wroteHeader = true
|
|
if rww.require == nil || rww.require.Match(status, rww.ResponseWriterWrapper.Header()) {
|
|
apply(rww.headerOps, rww.ResponseWriterWrapper.Header(), rww.replacer)
|
|
}
|
|
rww.ResponseWriterWrapper.WriteHeader(status)
|
|
}
|
|
|
|
func (rww *responseWriterWrapper) Write(d []byte) (int, error) {
|
|
if !rww.wroteHeader {
|
|
rww.WriteHeader(http.StatusOK)
|
|
}
|
|
return rww.ResponseWriterWrapper.Write(d)
|
|
}
|
|
|
|
// Interface guards
|
|
var (
|
|
_ caddyhttp.MiddlewareHandler = (*Headers)(nil)
|
|
_ caddyhttp.HTTPInterfaces = (*responseWriterWrapper)(nil)
|
|
)
|