gitea/modules/context/context_serve.go

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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/typesniffer"
)
type ServeHeaderOptions struct {
ContentType string // defaults to "application/octet-stream"
ContentTypeCharset string
ContentLength *int64
Disposition string // defaults to "attachment"
Filename string
CacheDuration time.Duration // defaults to 5 minutes
LastModified time.Time
}
// SetServeHeaders sets necessary content serve headers
func (ctx *Context) SetServeHeaders(opts *ServeHeaderOptions) {
header := ctx.Resp.Header()
contentType := typesniffer.ApplicationOctetStream
if opts.ContentType != "" {
if opts.ContentTypeCharset != "" {
contentType = opts.ContentType + "; charset=" + strings.ToLower(opts.ContentTypeCharset)
} else {
contentType = opts.ContentType
}
}
header.Set("Content-Type", contentType)
header.Set("X-Content-Type-Options", "nosniff")
if opts.ContentLength != nil {
header.Set("Content-Length", strconv.FormatInt(*opts.ContentLength, 10))
}
if opts.Filename != "" {
disposition := opts.Disposition
if disposition == "" {
disposition = "attachment"
}
backslashEscapedName := strings.ReplaceAll(strings.ReplaceAll(opts.Filename, `\`, `\\`), `"`, `\"`) // \ -> \\, " -> \"
header.Set("Content-Disposition", fmt.Sprintf(`%s; filename="%s"; filename*=UTF-8''%s`, disposition, backslashEscapedName, url.PathEscape(opts.Filename)))
header.Set("Access-Control-Expose-Headers", "Content-Disposition")
}
duration := opts.CacheDuration
if duration == 0 {
duration = 5 * time.Minute
}
httpcache.SetCacheControlInHeader(header, duration)
if !opts.LastModified.IsZero() {
header.Set("Last-Modified", opts.LastModified.UTC().Format(http.TimeFormat))
}
}
// ServeContent serves content to http request
func (ctx *Context) ServeContent(r io.ReadSeeker, opts *ServeHeaderOptions) {
ctx.SetServeHeaders(opts)
http.ServeContent(ctx.Resp, ctx.Req, opts.Filename, opts.LastModified, r)
}