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Fix content-type header for non-text-file attachments #20460

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Fix content-type header for non-text-file attachments #20460

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ea68b61
Fix content-type header for non-text files
silverwind Jul 23, 2022
fb51aad
move X-Content-Type-Options setter
silverwind Jul 23, 2022
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2 changes: 2 additions & 0 deletions modules/typesniffer/typesniffer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ const sniffLen = 1024
const (
// SvgMimeType MIME type of SVG images.
SvgMimeType = "image/svg+xml"
// PdfMimeType MIME type of PDF images.
PdfMimeType = "application/pdf"
// ApplicationOctetStream MIME type of binary files.
ApplicationOctetStream = "application/octet-stream"
)
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36 changes: 19 additions & 17 deletions routers/common/repo.go
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Expand Up @@ -66,37 +66,39 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)

st := typesniffer.DetectContentType(buf)

mappedMimeType := ""
mimeType := ""
if setting.MimeTypeMap.Enabled {
fileExtension := strings.ToLower(filepath.Ext(name))
mappedMimeType = setting.MimeTypeMap.Map[fileExtension]
mimeType = setting.MimeTypeMap.Map[fileExtension]
}

if st.IsText() || ctx.FormBool("render") {
cs, err := charset.DetectEncoding(buf)
if err != nil {
log.Error("Detect raw file %s charset failed: %v, using by default utf-8", name, err)
cs = "utf-8"
}
if mappedMimeType == "" {
mappedMimeType = "text/plain"
if mimeType == "" {
mimeType = "text/plain"
}
ctx.Resp.Header().Set("Content-Type", mappedMimeType+"; charset="+strings.ToLower(cs))
ctx.Resp.Header().Set("Content-Type", mimeType+"; charset="+strings.ToLower(cs))
} else {
ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
if mappedMimeType != "" {
ctx.Resp.Header().Set("Content-Type", mappedMimeType)
if mimeType == "" {
if st.IsSvgImage() {
mimeType = typesniffer.SvgMimeType
} else if st.IsPDF() {
mimeType = typesniffer.PdfMimeType
} else {
mimeType = typesniffer.ApplicationOctetStream
}
}
ctx.Resp.Header().Set("Content-Type", mimeType)
ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")

ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
if (st.IsImage() || st.IsPDF()) && (setting.UI.SVG.Enabled || !st.IsSvgImage()) {
ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, name))
if st.IsSvgImage() || st.IsPDF() {
ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
if st.IsSvgImage() {
ctx.Resp.Header().Set("Content-Type", typesniffer.SvgMimeType)
} else {
ctx.Resp.Header().Set("Content-Type", typesniffer.ApplicationOctetStream)
}
}
ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
} else {
ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, name))
}
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