forked from emersion/go-milter
/
receiver.go
167 lines (142 loc) · 3.25 KB
/
receiver.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
package main
import (
"bytes"
"errors"
"fmt"
"io"
"log"
"net"
"regexp"
"sync"
"time"
"github.com/d--j/go-milter/integration"
"github.com/emersion/go-smtp"
)
type Receiver struct {
Msg chan *integration.Output
expectOutput bool
m sync.Mutex
Config *Config
s *smtp.Server
}
type receiverBackend struct {
receiver *Receiver
}
type ReceiverSession struct {
Hostname string
Output *integration.Output
receiver *Receiver
}
func (rs *ReceiverSession) Reset() {
rs.Output = nil
}
func (rs *ReceiverSession) Logout() error {
return nil
}
func (rs *ReceiverSession) AuthPlain(_, _ string) error {
return errors.New("no auth")
}
func (rs *ReceiverSession) Mail(from string, opts *smtp.MailOptions) error {
if rs.Output == nil {
rs.Output = &integration.Output{}
}
rs.Output.From = integration.ToAddrArg(from, opts)
return nil
}
func (rs *ReceiverSession) Rcpt(to string, opts *smtp.RcptOptions) error {
rs.Output.To = append(rs.Output.To, integration.ToAddrArgRcpt(to, opts))
return nil
}
func (rs *ReceiverSession) Data(r io.Reader) (err error) {
var b []byte
b, err = io.ReadAll(r)
if err != nil {
return
}
endHeaders := bytes.Index(b, []byte("\r\n\r\n"))
if endHeaders < 0 {
return fmt.Errorf("no end header marker found: %q", b)
}
rs.Output.Header = b[:endHeaders+4]
rs.Output.Body = b[endHeaders+4:]
rs.receiver.onMsg(rs.Output)
return
}
func (r *receiverBackend) NewSession(c *smtp.Conn) (smtp.Session, error) {
return &ReceiverSession{Hostname: c.Hostname(), receiver: r.receiver}, nil
}
func (r *Receiver) Start() error {
r.Msg = make(chan *integration.Output, 100)
s := smtp.NewServer(&receiverBackend{receiver: r})
s.Addr = fmt.Sprintf(":%d", r.Config.ReceiverPort)
s.Domain = "localhost"
s.ReadTimeout = 10 * time.Second
s.WriteTimeout = 10 * time.Second
s.MaxMessageBytes = 1024 * 1024
s.MaxRecipients = 50
s.AllowInsecureAuth = true
s.EnableSMTPUTF8 = true
s.EnableREQUIRETLS = true
l, err := net.Listen("tcp", s.Addr)
if err != nil {
return err
}
go func() {
_ = s.Serve(l)
}()
r.s = s
return nil
}
func (r *Receiver) clearMessages() {
for {
select {
case o := <-r.Msg:
r.onUnexpectedMsg(o)
default:
return
}
}
}
func (r *Receiver) ExpectMessage() {
r.m.Lock()
defer r.m.Unlock()
r.expectOutput = true
r.clearMessages()
}
func (r *Receiver) IgnoreMessages() {
r.m.Lock()
defer r.m.Unlock()
r.expectOutput = false
r.clearMessages()
}
var receiverMatch = regexp.MustCompile("(?ms)^Received:.*?(\r\n[^ \t])")
func (r *Receiver) WaitForMessage() *integration.Output {
select {
case <-time.After(time.Second * 20):
return nil
case o := <-r.Msg:
if o.Header != nil {
// replace the first received line with a placeholder
loc := receiverMatch.FindIndex(o.Header)
if len(loc) == 2 {
o.Header = append(o.Header[:loc[0]], append([]byte("Received: placeholder"), o.Header[loc[1]-3:]...)...)
}
}
return o
}
}
func (r *Receiver) onMsg(output *integration.Output) {
r.m.Lock()
defer r.m.Unlock()
if r.expectOutput {
r.Msg <- output
} else {
r.onUnexpectedMsg(output)
}
}
func (r *Receiver) onUnexpectedMsg(output *integration.Output) {
log.Printf("WARN: unexpected message received: %s", output)
}
func (r *Receiver) Cleanup() {
_ = r.s.Close()
}