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webmail: add buttons to download a message as eml, and export 1 or more messages as mbox/maildir in zip/tgz/tar, like for entire mailboxes

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Download as eml is useful with firefox, because opening the raw message in a
new tab, and then downloading it, causes firefox to request the url without
cookies, causing it to save a "403 - forbidden" response.

Exporting a selection is useful during all kinds of testing. Makes it easy to
an entire thread, or just some messages.

The export popover now has buttons for each combination of mbox/maildir vs
zip/tgz/tar. Before you may have had to select the email format and archive
format first, followed by a click. Now it's just a click.
This commit is contained in:
Mechiel Lukkien
2025-03-29 18:10:23 +01:00
parent d6e55b5f36
commit a5d74eb718
8 changed files with 591 additions and 394 deletions
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27
webmail/webmail.go
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@ -618,25 +618,42 @@ func handle(apiHandler http.Handler, isForwarded bool, accountPath string, w htt
err = zw.Close()
log.Check(err, "final write to zip file")
// Raw display of a message, as text/plain.
case len(t) == 2 && t[1] == "raw":
_, _, _, msgr, p, cleanup, ok := xprepare()
// Raw display or download of a message, as text/plain.
case len(t) == 2 && (t[1] == "raw" || t[1] == "rawdl"):
_, _, m, msgr, p, cleanup, ok := xprepare()
if !ok {
return
}
defer cleanup()
headers(false, false, false, false)
// We intentially use text/plain. We certainly don't want to return a format that
// browsers or users would think of executing. We do set the charset if available
// on the outer part. If present, we assume it may be relevant for other parts. If
// not, there is not much we could do better...
headers(false, false, false, false)
ct := "text/plain"
params := map[string]string{}
if charset := p.ContentTypeParams["charset"]; charset != "" {
if t[1] == "rawdl" {
ct = "message/rfc822"
if smtputf8, err := p.NeedsSMTPUTF8(); err != nil {
log.Errorx("checking for smtputf8 for content-type", err, slog.Int64("msgid", m.ID))
http.Error(w, "500 - server error - checking message for content-type: "+err.Error(), http.StatusInternalServerError)
return
} else if smtputf8 {
ct = "message/global"
params["charset"] = "utf-8"
}
} else if charset := p.ContentTypeParams["charset"]; charset != "" {
params["charset"] = charset
}
h.Set("Content-Type", mime.FormatMediaType(ct, params))
if t[1] == "rawdl" {
filename := fmt.Sprintf("email-%d-%s.eml", m.ID, m.Received.Format("20060102-150405"))
cd := mime.FormatMediaType("attachment", map[string]string{"filename": filename})
h.Set("Content-Disposition", cd)
}
h.Set("Cache-Control", "no-store, max-age=0")
_, err := io.Copy(w, &moxio.AtReader{R: msgr})