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improve dsn handling

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have the full smtp reply in the Diagnostic-Code field, not something that
resembles it but isn't quite the same.

include any additional error message in the Status field as comment.

before, we ended up having an Diagnostic-Code that didn't include the original
smtp code. it only had the enhanced error code.
This commit is contained in:
Mechiel Lukkien
2024-02-20 16:31:15 +01:00
parent dc83ad1df5
commit 1c934f0103
8 changed files with 69 additions and 116 deletions
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60
dsn/dsn.go
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@ -11,7 +11,6 @@ import (
"io"
"mime/multipart"
"net/textproto"
"strconv"
"strings"
"time"
@ -100,9 +99,10 @@ type Recipient struct {
Action Action
// Enhanced status code. First digit indicates permanent or temporary
// error. If the string contains more than just a status, that
// additional text is added as comment when composing a DSN.
// error.
Status string
// For additional details, included in comment.
StatusComment string
// Optional fields.
// Original intended recipient of message. Used with the DSN extensions ORCPT
@ -114,10 +114,10 @@ type Recipient struct {
// deliveries.
RemoteMTA NameIP
// If RemoteMTA is present, DiagnosticCode is from remote. When
// creating a DSN, additional text in the string will be added to the
// DSN as comment.
DiagnosticCode string
// DiagnosticCode should either be empty, or start with "smtp; " followed by the
// literal full SMTP response lines, space separated.
DiagnosticCode string
LastAttemptDate time.Time
FinalLogID string
@ -272,11 +272,9 @@ func (m *Message) Compose(log mlog.Log, smtputf8 bool) ([]byte, error) {
st = "2.0.0"
}
}
var rest string
st, rest = codeLine(st)
statusLine := st
if rest != "" {
statusLine += " (" + rest + ")"
if r.StatusComment != "" {
statusLine += " (" + r.StatusComment + ")"
}
status("Status", statusLine) // ../rfc/3464:975
if !r.RemoteMTA.IsZero() {
@ -289,13 +287,8 @@ func (m *Message) Compose(log mlog.Log, smtputf8 bool) ([]byte, error) {
}
// Presence of Diagnostic-Code indicates the code is from Remote-MTA. ../rfc/3464:1053
if r.DiagnosticCode != "" {
diagCode, rest := codeLine(r.DiagnosticCode)
diagLine := diagCode
if rest != "" {
diagLine += " (" + rest + ")"
}
// ../rfc/6533:589
status("Diagnostic-Code", "smtp; "+diagLine)
// ../rfc/3461:1342 ../rfc/6533:589
status("Diagnostic-Code", r.DiagnosticCode)
}
if !r.LastAttemptDate.IsZero() {
status("Last-Attempt-Date", r.LastAttemptDate.Format(message.RFC5322Z)) // ../rfc/3464:1076
@ -388,34 +381,3 @@ func (w *errWriter) Write(buf []byte) (int, error) {
w.err = err
return n, err
}
// split a line into enhanced status code and rest.
func codeLine(s string) (string, string) {
t := strings.SplitN(s, " ", 2)
l := strings.Split(t[0], ".")
if len(l) != 3 {
return "", s
}
for i, e := range l {
_, err := strconv.ParseInt(e, 10, 32)
if err != nil {
return "", s
}
if i == 0 && len(e) != 1 {
return "", s
}
}
var rest string
if len(t) == 2 {
rest = t[1]
}
return t[0], rest
}
// HasCode returns whether line starts with an enhanced SMTP status code.
func HasCode(line string) bool {
// ../rfc/3464:986
ecode, _ := codeLine(line)
return ecode != ""
}