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Rework raw file http header logic (#20484)
- Always respect the user's configured mime type map - Allow more types like image/pdf/video/audio to serve with correct content-type - Shorten cache duration of raw files to 5 minutes, matching GitHub - Don't set `content-disposition: attachment`, let the browser decide whether it wants to download or display a file directly - Implement rfc5987 for filenames, remove previous hack. Confirmed it working in Safari. - Make PDF attachment work in Safari by removing `sandbox` attribute. This change will make a lot more file types open directly in browser now. Logic should generally be more readable than before with less `if` nesting and such. Replaces: https://github.com/go-gitea/gitea/pull/20460 Replaces: https://github.com/go-gitea/gitea/pull/20455 Fixes: https://github.com/go-gitea/gitea/issues/20404
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parent
7fe77f0167
commit
eaf653f843
2 changed files with 67 additions and 39 deletions
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@ -70,6 +70,16 @@ func (ct SniffedType) IsRepresentableAsText() bool {
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return ct.IsText() || ct.IsSvgImage()
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}
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// IsBrowsableType returns whether a non-text type can be displayed in a browser
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func (ct SniffedType) IsBrowsableBinaryType() bool {
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return ct.IsImage() || ct.IsSvgImage() || ct.IsPDF() || ct.IsVideo() || ct.IsAudio()
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}
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// GetMimeType returns the mime type
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func (ct SniffedType) GetMimeType() string {
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return strings.SplitN(ct.contentType, ";", 2)[0]
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}
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// DetectContentType extends http.DetectContentType with more content types. Defaults to text/unknown if input is empty.
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func DetectContentType(data []byte) SniffedType {
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if len(data) == 0 {
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@ -7,12 +7,13 @@ package common
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import (
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"fmt"
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"io"
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"net/url"
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"path"
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"path/filepath"
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"strings"
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"time"
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"code.gitea.io/gitea/modules/charset"
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charsetModule "code.gitea.io/gitea/modules/charset"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/httpcache"
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@ -42,7 +43,7 @@ func ServeBlob(ctx *context.Context, blob *git.Blob, lastModified time.Time) err
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}
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// ServeData download file from io.Reader
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func ServeData(ctx *context.Context, name string, size int64, reader io.Reader) error {
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func ServeData(ctx *context.Context, filePath string, size int64, reader io.Reader) error {
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buf := make([]byte, 1024)
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n, err := util.ReadAtMost(reader, buf)
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if err != nil {
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@ -52,56 +53,73 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)
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buf = buf[:n]
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}
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ctx.Resp.Header().Set("Cache-Control", "public,max-age=86400")
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httpcache.AddCacheControlToHeader(ctx.Resp.Header(), 5*time.Minute)
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if size >= 0 {
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ctx.Resp.Header().Set("Content-Length", fmt.Sprintf("%d", size))
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} else {
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log.Error("ServeData called to serve data: %s with size < 0: %d", name, size)
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log.Error("ServeData called to serve data: %s with size < 0: %d", filePath, size)
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}
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name = path.Base(name)
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// Google Chrome dislike commas in filenames, so let's change it to a space
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name = strings.ReplaceAll(name, ",", " ")
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fileName := path.Base(filePath)
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sniffedType := typesniffer.DetectContentType(buf)
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isPlain := sniffedType.IsText() || ctx.FormBool("render")
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mimeType := ""
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charset := ""
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st := typesniffer.DetectContentType(buf)
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mappedMimeType := ""
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if setting.MimeTypeMap.Enabled {
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fileExtension := strings.ToLower(filepath.Ext(name))
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mappedMimeType = setting.MimeTypeMap.Map[fileExtension]
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fileExtension := strings.ToLower(filepath.Ext(fileName))
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mimeType = setting.MimeTypeMap.Map[fileExtension]
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}
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if st.IsText() || ctx.FormBool("render") {
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cs, err := charset.DetectEncoding(buf)
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if err != nil {
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log.Error("Detect raw file %s charset failed: %v, using by default utf-8", name, err)
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cs = "utf-8"
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}
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if mappedMimeType == "" {
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mappedMimeType = "text/plain"
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}
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ctx.Resp.Header().Set("Content-Type", mappedMimeType+"; charset="+strings.ToLower(cs))
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} else {
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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if mappedMimeType != "" {
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ctx.Resp.Header().Set("Content-Type", mappedMimeType)
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}
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if (st.IsImage() || st.IsPDF()) && (setting.UI.SVG.Enabled || !st.IsSvgImage()) {
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ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, name))
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if st.IsSvgImage() || st.IsPDF() {
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
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ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
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if st.IsSvgImage() {
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ctx.Resp.Header().Set("Content-Type", typesniffer.SvgMimeType)
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} else {
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ctx.Resp.Header().Set("Content-Type", typesniffer.ApplicationOctetStream)
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}
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}
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if mimeType == "" {
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if sniffedType.IsBrowsableBinaryType() {
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mimeType = sniffedType.GetMimeType()
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} else if isPlain {
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mimeType = "text/plain"
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} else {
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ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, name))
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mimeType = typesniffer.ApplicationOctetStream
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}
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}
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if isPlain {
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charset, err = charsetModule.DetectEncoding(buf)
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if err != nil {
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log.Error("Detect raw file %s charset failed: %v, using by default utf-8", filePath, err)
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charset = "utf-8"
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}
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}
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if charset != "" {
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ctx.Resp.Header().Set("Content-Type", mimeType+"; charset="+strings.ToLower(charset))
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} else {
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ctx.Resp.Header().Set("Content-Type", mimeType)
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}
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ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
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isSVG := sniffedType.IsSvgImage()
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// serve types that can present a security risk with CSP
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if isSVG {
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
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} else if sniffedType.IsPDF() {
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// no sandbox attribute for pdf as it breaks rendering in at least safari. this
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// should generally be safe as scripts inside PDF can not escape the PDF document
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// see https://bugs.chromium.org/p/chromium/issues/detail?id=413851 for more discussion
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ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'")
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}
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disposition := "inline"
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if isSVG && !setting.UI.SVG.Enabled {
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disposition = "attachment"
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}
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// encode filename per https://datatracker.ietf.org/doc/html/rfc5987
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encodedFileName := `filename*=UTF-8''` + url.PathEscape(fileName)
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ctx.Resp.Header().Set("Content-Disposition", disposition+"; "+encodedFileName)
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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_, err = ctx.Resp.Write(buf)
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if err != nil {
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return err
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