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116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
package smtpserver
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import (
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"fmt"
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"github.com/mjl-/mox/message"
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)
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// ../rfc/8601:577
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// Authentication-Results header, see RFC 8601.
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type AuthResults struct {
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Hostname string
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Comment string // If not empty, header comment without "()", added after Hostname.
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Methods []AuthMethod
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}
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// ../rfc/8601:598
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// AuthMethod is a result for one authentication method.
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//
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// Example encoding in the header: "spf=pass smtp.mailfrom=example.net".
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type AuthMethod struct {
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// E.g. "dkim", "spf", "iprev", "auth".
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Method string
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Result string // Each method has a set of known values, e.g. "pass", "temperror", etc.
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Comment string // Optional, message header comment.
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Reason string // Optional.
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Props []AuthProp
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}
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// ../rfc/8601:606
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// AuthProp describes properties for an authentication method.
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// Each method has a set of known properties.
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// Encoded in the header as "type.property=value", e.g. "smtp.mailfrom=example.net"
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// for spf.
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type AuthProp struct {
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// Valid values maintained at https://www.iana.org/assignments/email-auth/email-auth.xhtml
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Type string
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Property string
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Value string
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// Whether value is address-like (localpart@domain, or domain). Or another value,
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// which is subject to escaping.
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IsAddrLike bool
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Comment string // If not empty, header comment withtout "()", added after Value.
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}
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// todo future: we could store fields as dns.Domain, and when we encode as non-ascii also add the ascii version as a comment.
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// Header returns an Authentication-Results header, possibly spanning multiple
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// lines, always ending in crlf.
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func (h AuthResults) Header() string {
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// Escaping of values: ../rfc/8601:684 ../rfc/2045:661
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optComment := func(s string) string {
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if s != "" {
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return " (" + s + ")"
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}
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return s
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}
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w := &message.HeaderWriter{}
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w.Add("", "Authentication-Results:"+optComment(h.Comment)+" "+value(h.Hostname)+";")
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for i, m := range h.Methods {
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tokens := []string{}
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addf := func(format string, args ...any) {
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s := fmt.Sprintf(format, args...)
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tokens = append(tokens, s)
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}
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addf("%s=%s", m.Method, m.Result)
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if m.Comment != "" && (m.Reason != "" || len(m.Props) > 0) {
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addf("(%s)", m.Comment)
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}
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if m.Reason != "" {
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addf("reason=%s", value(m.Reason))
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}
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for _, p := range m.Props {
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v := p.Value
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if !p.IsAddrLike {
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v = value(v)
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}
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addf("%s.%s=%s%s", p.Type, p.Property, v, optComment(p.Comment))
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}
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for j, t := range tokens {
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if j == len(tokens)-1 && i < len(h.Methods)-1 {
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t += ";"
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}
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w.Add(" ", t)
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}
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}
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return w.String()
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}
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func value(s string) string {
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quote := s == ""
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for _, c := range s {
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// utf-8 does not have to be quoted. ../rfc/6532:242
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if c == '"' || c == '\\' || c <= ' ' || c == 0x7f {
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quote = true
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break
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}
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}
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if !quote {
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return s
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}
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r := `"`
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for _, c := range s {
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if c == '"' || c == '\\' {
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r += "\\"
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}
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r += string(c)
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}
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r += `"`
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return r
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}
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