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when exporting mbox files, set new status,x-status,x-keywords headers, and remove any content-length header

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Mechiel Lukkien 2023-02-17 17:04:48 +01:00
parent c65731ac56
commit f76fe26976
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1 changed files with 61 additions and 2 deletions
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63
store/export.go
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@ -105,6 +105,8 @@ func (a DirArchiver) Close() error {
// file "errors.txt" is added to the archive describing the errors. The goal is to
// let users export (hopefully) most messages even in the face of errors.
func ExportMessages(log *mlog.Log, db *bstore.DB, accountDir string, archiver Archiver, maildir bool, mailboxOpt string) error {
// todo optimize: should prepare next file to add to archive (can be an mbox with many messages) while writing a file to the archive (which typically compresses, which takes time).
// Start transaction without closure, we are going to close it early, but don't
// want to deal with declaring many variables now to be able to assign them in a
// closure and use them afterwards.
@ -398,8 +400,6 @@ func ExportMessages(log *mlog.Log, db *bstore.DB, accountDir string, archiver Ar
return w.Close()
}
// todo: should we put status flags in Status or X-Status header inside the message?
// todo: should we do anything with Content-Length headers? changing the escaping could invalidate those. is anything checking that field?
mailfrom := "mox"
if m.MailFrom != "" {
mailfrom = m.MailFrom
@ -407,6 +407,54 @@ func ExportMessages(log *mlog.Log, db *bstore.DB, accountDir string, archiver Ar
if _, err := fmt.Fprintf(mboxwriter, "From %s %s\n", mailfrom, m.Received.Format(time.ANSIC)); err != nil {
return fmt.Errorf("write message line to mbox temp file: %v", err)
}
// Write message flags in the three headers that mbox consumers may (or may not) understand.
if m.Seen {
if _, err := fmt.Fprintf(mboxwriter, "Status: R\n"); err != nil {
return fmt.Errorf("writing status header: %v", err)
}
}
xstatus := ""
if m.Answered {
xstatus += "A"
}
if m.Flagged {
xstatus += "F"
}
if m.Draft {
xstatus += "T"
}
if m.Deleted {
xstatus += "D"
}
if xstatus != "" {
if _, err := fmt.Fprintf(mboxwriter, "X-Status: %s\n", xstatus); err != nil {
return fmt.Errorf("writing x-status header: %v", err)
}
}
var xkeywords []string
if m.Forwarded {
xkeywords = append(xkeywords, "$Forwarded")
}
if m.Junk && !m.Notjunk {
xkeywords = append(xkeywords, "$Junk")
}
if m.Notjunk && !m.Junk {
xkeywords = append(xkeywords, "$NotJunk")
}
if m.Phishing {
xkeywords = append(xkeywords, "$Phishing")
}
if m.MDNSent {
xkeywords = append(xkeywords, "$MDNSent")
}
if len(xkeywords) > 0 {
if _, err := fmt.Fprintf(mboxwriter, "X-Keywords: %s\n", strings.Join(xkeywords, ",")); err != nil {
return fmt.Errorf("writing x-keywords header: %v", err)
}
}
header := true
r := bufio.NewReader(mr)
for {
line, rerr := r.ReadBytes('\n')
@ -418,6 +466,17 @@ func ExportMessages(log *mlog.Log, db *bstore.DB, accountDir string, archiver Ar
line = line[:len(line)-1]
line[len(line)-1] = '\n'
}
if header && len(line) == 1 {
header = false
}
if header {
// Skip any previously stored flag-holding or now incorrect content-length headers.
// This assumes these headers are just a single line.
switch strings.ToLower(string(bytes.SplitN(line, []byte(":"), 2)[0])) {
case "status", "x-status", "x-keywords", "content-length":
continue
}
}
if bytes.HasPrefix(bytes.TrimLeft(line, ">"), []byte("From ")) {
if _, err := fmt.Fprint(mboxwriter, ">"); err != nil {
return fmt.Errorf("writing escaping >: %v", err)