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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package httplib
import (
"bytes"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"path"
"path/filepath"
"strconv"
"strings"
"time"
charsetModule "code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/typesniffer"
"code.gitea.io/gitea/modules/util"
"github.com/klauspost/compress/gzhttp"
)
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
}
// ServeSetHeaders sets necessary content serve headers
func ServeSetHeaders(w http.ResponseWriter, opts *ServeHeaderOptions) {
header := w.Header()
skipCompressionExts := container.SetOf(".gz", ".bz2", ".zip", ".xz", ".zst", ".deb", ".apk", ".jar", ".png", ".jpg", ".webp")
if skipCompressionExts.Contains(strings.ToLower(path.Ext(opts.Filename))) {
w.Header().Add(gzhttp.HeaderNoCompression, "1")
}
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))
}
}
// ServeData download file from io.Reader
func setServeHeadersByFile(r *http.Request, w http.ResponseWriter, filePath string, mineBuf []byte) {
// do not set "Content-Length", because the length could only be set by callers, and it needs to support range requests
opts := &ServeHeaderOptions{
Filename: path.Base(filePath),
}
sniffedType := typesniffer.DetectContentType(mineBuf)
// the "render" parameter came from year 2016: 638dd24c, it doesn't have clear meaning, so I think it could be removed later
isPlain := sniffedType.IsText() || r.FormValue("render") != ""
if setting.MimeTypeMap.Enabled {
fileExtension := strings.ToLower(filepath.Ext(filePath))
opts.ContentType = setting.MimeTypeMap.Map[fileExtension]
}
if opts.ContentType == "" {
if sniffedType.IsBrowsableBinaryType() {
opts.ContentType = sniffedType.GetMimeType()
} else if isPlain {
opts.ContentType = "text/plain"
} else {
opts.ContentType = typesniffer.ApplicationOctetStream
}
}
if isPlain {
charset, err := charsetModule.DetectEncoding(mineBuf)
if err != nil {
log.Error("Detect raw file %s charset failed: %v, using by default utf-8", filePath, err)
charset = "utf-8"
}
opts.ContentTypeCharset = strings.ToLower(charset)
}
isSVG := sniffedType.IsSvgImage()
// serve types that can present a security risk with CSP
if isSVG {
w.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
} else if sniffedType.IsPDF() {
// no sandbox attribute for pdf as it breaks rendering in at least safari. this
// should generally be safe as scripts inside PDF can not escape the PDF document
// see https://bugs.chromium.org/p/chromium/issues/detail?id=413851 for more discussion
w.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'")
}
opts.Disposition = "inline"
if isSVG && !setting.UI.SVG.Enabled {
opts.Disposition = "attachment"
}
ServeSetHeaders(w, opts)
}
const mimeDetectionBufferLen = 1024
func ServeContentByReader(r *http.Request, w http.ResponseWriter, filePath string, size int64, reader io.Reader) {
buf := make([]byte, mimeDetectionBufferLen)
n, err := util.ReadAtMost(reader, buf)
if err != nil {
http.Error(w, "serve content: unable to pre-read", http.StatusRequestedRangeNotSatisfiable)
return
}
if n >= 0 {
buf = buf[:n]
}
setServeHeadersByFile(r, w, filePath, buf)
// reset the reader to the beginning
reader = io.MultiReader(bytes.NewReader(buf), reader)
rangeHeader := r.Header.Get("Range")
// if no size or no supported range, serve as 200 (complete response)
if size <= 0 || !strings.HasPrefix(rangeHeader, "bytes=") {
if size >= 0 {
w.Header().Set("Content-Length", strconv.FormatInt(size, 10))
}
_, _ = io.Copy(w, reader) // just like http.ServeContent, not necessary to handle the error
return
}
// do our best to support the minimal "Range" request (no support for multiple range: "Range: bytes=0-50, 100-150")
//
// GET /...
// Range: bytes=0-1023
//
// HTTP/1.1 206 Partial Content
// Content-Range: bytes 0-1023/146515
// Content-Length: 1024
_, rangeParts, _ := strings.Cut(rangeHeader, "=")
rangeBytesStart, rangeBytesEnd, found := strings.Cut(rangeParts, "-")
start, err := strconv.ParseInt(rangeBytesStart, 10, 64)
if start < 0 || start >= size {
err = errors.New("invalid start range")
}
if err != nil {
http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable)
return
}
end, err := strconv.ParseInt(rangeBytesEnd, 10, 64)
if rangeBytesEnd == "" && found {
err = nil
end = size - 1
}
if end >= size {
end = size - 1
}
if end < start {
err = errors.New("invalid end range")
}
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
partialLength := end - start + 1
w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", start, end, size))
w.Header().Set("Content-Length", strconv.FormatInt(partialLength, 10))
if _, err = io.CopyN(io.Discard, reader, start); err != nil {
http.Error(w, "serve content: unable to skip", http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusPartialContent)
_, _ = io.CopyN(w, reader, partialLength) // just like http.ServeContent, not necessary to handle the error
}
func ServeContentByReadSeeker(r *http.Request, w http.ResponseWriter, filePath string, modTime *time.Time, reader io.ReadSeeker) {
buf := make([]byte, mimeDetectionBufferLen)
n, err := util.ReadAtMost(reader, buf)
if err != nil {
http.Error(w, "serve content: unable to read", http.StatusInternalServerError)
return
}
if _, err = reader.Seek(0, io.SeekStart); err != nil {
http.Error(w, "serve content: unable to seek", http.StatusInternalServerError)
return
}
if n >= 0 {
buf = buf[:n]
}
setServeHeadersByFile(r, w, filePath, buf)
if modTime == nil {
modTime = &time.Time{}
}
http.ServeContent(w, r, path.Base(filePath), *modTime, reader)
}
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