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webmail: when q/b-word-decoding attachment filenames, recognize more charset encodings

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based on #113 by jsfan3
This commit is contained in:
Mechiel Lukkien 2024-01-12 15:25:23 +01:00
parent aea8740e65
commit 46aacdb79b
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1 changed files with 19 additions and 2 deletions
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21
webmail/message.go
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@ -9,6 +9,7 @@ import (
"strings"
"golang.org/x/exp/slog"
"golang.org/x/text/encoding/ianaindex"
"github.com/mjl-/mox/dns"
"github.com/mjl-/mox/message"
@ -21,6 +22,23 @@ import (
// todo: we should have all needed information for messageItem in store.Message (perhaps some data in message.Part) for fast access, not having to parse the on-disk message file.
var wordDecoder = mime.WordDecoder{
CharsetReader: func(charset string, r io.Reader) (io.Reader, error) {
switch strings.ToLower(charset) {
case "", "us-ascii", "utf-8":
return r, nil
}
enc, _ := ianaindex.MIME.Encoding(charset)
if enc == nil {
enc, _ = ianaindex.IANA.Encoding(charset)
}
if enc == nil {
return r, fmt.Errorf("unknown charset %q", charset)
}
return enc.NewDecoder().Reader(r), nil
},
}
// Attempt q/b-word-decode name, coming from Content-Type "name" field or
// Content-Disposition "filename" field.
//
@ -43,8 +61,7 @@ func tryDecodeParam(log mlog.Log, name string) string {
log.Debug("attachment contains rfc2047 q/b-word-encoded mime parameter instead of rfc2231-encoded", slog.String("name", name))
return name
}
dec := mime.WordDecoder{}
s, err := dec.DecodeHeader(name)
s, err := wordDecoder.DecodeHeader(name)
if err != nil {
log.Debugx("q/b-word decoding mime parameter", err, slog.String("name", name))
return name