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// Copyright 2013 The Go Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd.
package httputil
import (
"bytes"
"net/http"
"strconv"
)
// ResponseBuffer is the current response being composed by its owner.
// It implements http.ResponseWriter and io.WriterTo.
type ResponseBuffer struct {
buf bytes.Buffer
status int
header http.Header
}
// Write implements the http.ResponseWriter interface.
func (rb *ResponseBuffer) Write(p []byte) (int, error) {
return rb.buf.Write(p)
}
// WriteHeader implements the http.ResponseWriter interface.
func (rb *ResponseBuffer) WriteHeader(status int) {
rb.status = status
}
// Header implements the http.ResponseWriter interface.
func (rb *ResponseBuffer) Header() http.Header {
if rb.header == nil {
rb.header = make(http.Header)
}
return rb.header
}
// WriteTo implements the io.WriterTo interface.
func (rb *ResponseBuffer) WriteTo(w http.ResponseWriter) error {
for k, v := range rb.header {
w.Header()[k] = v
}
if rb.buf.Len() > 0 {
w.Header().Set("Content-Length", strconv.Itoa(rb.buf.Len()))
}
if rb.status != 0 {
w.WriteHeader(rb.status)
}
if rb.buf.Len() > 0 {
if _, err := w.Write(rb.buf.Bytes()); err != nil {
return err
}
}
return nil
}
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