/
message.go
163 lines (136 loc) · 4.03 KB
/
message.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
package server
import (
"fmt"
"github.com/arnisoph/postisto/pkg/log"
imapUtil "github.com/emersion/go-imap"
"github.com/emersion/go-message"
mailUtil "github.com/emersion/go-message/mail"
"strings"
)
type RawMessage imapUtil.Message
type Message struct {
RawMessage imapUtil.Message
Headers MessageHeaders
}
type MessageHeaders map[string]interface{}
func NewMessage(rawMail *imapUtil.Message, headers MessageHeaders) *Message {
return &Message{RawMessage: *rawMail, Headers: headers}
}
func parseMessageHeaders(rawMessage *imapUtil.Message) (MessageHeaders, error) {
headers := MessageHeaders{}
var err error
// Create for mail parsing
var section imapUtil.BodySectionName
section.Specifier = imapUtil.HeaderSpecifier // Loads all headers only (no body)
msgBody := rawMessage.GetBody(§ion)
if msgBody == nil {
return headers, fmt.Errorf("server didn't returned message body for mail")
}
mr, err := mailUtil.CreateReader(msgBody)
if err != nil && !message.IsUnknownCharset(err) {
log.Errorw("Failed to create message reader", err, "message_id", rawMessage.Envelope.MessageId)
return headers, err
} else {
// The error is not an error because the charset could be determined automatically. Weird logic...
err = nil
}
// Address Lists in headers
addrFields := []string{"from", "to", "cc", "reply-to"}
for _, fieldName := range addrFields {
parsedList, err := parseAddrList(mr, fieldName, mr.Header.Get(fieldName))
if err != nil {
return nil, err
} else {
if parsedList == "" {
// no need to set non-existent fields
continue
}
headers[fieldName] = parsedList
}
}
// Some other standard envelope headers
headers["subject"] = strings.ToLower(fmt.Sprintf("%v", rawMessage.Envelope.Subject))
headers["date"] = strings.ToLower(fmt.Sprintf("%v", rawMessage.Envelope.Date))
headers["message-id"] = strings.ToLower(fmt.Sprintf("%v", rawMessage.Envelope.MessageId))
// All the other headers
alreadyHandled := []string{"subject", "date", "message-id"}
alreadyHandled = append(alreadyHandled, addrFields...)
fields := mr.Header.Fields()
for {
next := fields.Next()
if !next {
break
}
fieldName := strings.ToLower(fields.Key())
fieldValue := strings.ToLower(fields.Value())
if contains(alreadyHandled, fieldName) {
// we maintain these headers elsewhere
continue
}
switch val := headers[fieldName].(type) {
case nil:
// detected new header
headers[fieldName] = fieldValue
case string:
headerList := []string{val, fieldValue}
headers[fieldName] = headerList
case []string:
headers[fieldName] = append(val, fieldValue)
}
}
/*
// Process each message's part
for {
p, err := m.NextPart()
if err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
switch h := p.Header.(type) {
case *mail.InlineHeader:
// This is the message's text (can be plain-text or HTML)
b, _ := ioutil.ReadAll(p.Body)
log.Printf("Got text: %v", string(b))
case *mail.AttachmentHeader:
// This is an attachment
filename, _ := h.Filename()
log.Printf("Got attachment: %v", filename)
}
}
*/
return headers, err
}
func parseAddrList(mr *mailUtil.Reader, fieldName string, fallback string) (string, error) {
var fieldValue string
addrs, err := mr.Header.AddressList(fieldName)
if addrs == nil {
// parsing failed, so return own or externally set fallback
f := mr.Header.FieldsByKey(fieldName)
if !f.Next() {
return "", err
} else {
return strings.TrimSpace(fallback), nil
}
}
if err != nil && err.Error() != "mail: missing '@' or angle-addr" { //ignore bad formated addrs
// oh, real error
return "", err
}
for _, addr := range addrs {
formattedAddr := strings.ToLower(strings.TrimSpace(fmt.Sprintf("%v <%v>", addr.Name, addr.Address)))
if fieldValue != "" {
fieldValue += ", "
}
fieldValue += formattedAddr
}
return strings.TrimSpace(fieldValue), err
}
func contains(s []string, e string) bool { //TODO do we really need to implement this?
for _, a := range s {
if a == e {
return true
}
}
return false
}