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49 lines
1.2 KiB
49 lines
1.2 KiB
// Copyright 2018 Gin Core Team. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package render
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import (
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"io"
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"net/http"
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"strconv"
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)
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// Reader contains the IO reader and its length, and custom ContentType and other headers.
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type Reader struct {
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ContentType string
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ContentLength int64
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Reader io.Reader
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Headers map[string]string
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}
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// Render (Reader) writes data with custom ContentType and headers.
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func (r Reader) Render(w http.ResponseWriter) (err error) {
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r.WriteContentType(w)
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if r.ContentLength >= 0 {
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if r.Headers == nil {
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r.Headers = map[string]string{}
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}
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r.Headers["Content-Length"] = strconv.FormatInt(r.ContentLength, 10)
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}
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r.writeHeaders(w, r.Headers)
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_, err = io.Copy(w, r.Reader)
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return
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}
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// WriteContentType (Reader) writes custom ContentType.
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func (r Reader) WriteContentType(w http.ResponseWriter) {
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writeContentType(w, []string{r.ContentType})
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}
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// writeHeaders writes custom Header.
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func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
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header := w.Header()
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for k, v := range headers {
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if header.Get(k) == "" {
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header.Set(k, v)
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}
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}
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}
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