/
client.go
177 lines (151 loc) · 3.68 KB
/
client.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
168
169
170
171
172
173
174
175
176
177
package imap
import (
"crypto/tls"
"github.com/emersion/go-imap"
"github.com/emersion/go-imap/client"
"github.com/emersion/go-message/mail"
"io"
"jaytaylor.com/html2text"
"strconv"
)
type emailResult struct {
Email *EMail
Error error
}
func emailResultFromError(err error) emailResult {
return emailResult{Error: err}
}
func newImapClient(host string, port int, useTls bool) (*client.Client, error) {
address := host + ":" + strconv.Itoa(port)
if useTls {
return client.DialTLS(address, &tls.Config{})
}
return client.Dial(address)
}
// Client is a high level API for IMAP
type Client struct {
imap *client.Client
}
// NewClient creates a new TCP connection and logs the user in
func NewClient(host string, port int, useTls bool, mail string, password string) (*Client, error) {
imapClient, err := newImapClient(host, port, useTls)
if err != nil {
return nil, err
}
err = imapClient.Login(mail, password)
if err != nil {
return nil, err
}
return &Client{imap: imapClient}, nil
}
// DeleteMail by uid, marks for deletion
func (c *Client) DeleteMail(uid uint32) error {
seqSet := new(imap.SeqSet)
seqSet.AddNum(uid)
err := c.imap.UidStore(seqSet, "+FLAGS", []interface{}{imap.DeletedFlag}, nil)
if err != nil {
return err
}
return nil
}
// GetMails for a given folder from the server
func (c *Client) GetMails(folder string) chan emailResult {
results := make(chan emailResult)
_, err := c.imap.Select(folder, false)
if err != nil {
results <- emailResultFromError(err)
close(results)
return results
}
criteria := imap.NewSearchCriteria()
messageIds, err := c.imap.Search(criteria)
if err != nil {
results <- emailResultFromError(err)
close(results)
return results
}
if len(messageIds) == 0 {
close(results)
return results
}
seqSet := new(imap.SeqSet)
seqSet.AddNum(messageIds...)
messages := make(chan *imap.Message, len(messageIds))
done := make(chan error, 1)
bodySection := &imap.BodySectionName{}
go func() {
done <- c.imap.Fetch(seqSet, []imap.FetchItem{imap.FetchEnvelope, imap.FetchBodyStructure, bodySection.FetchItem()}, messages)
}()
go func() {
for msg := range messages {
email, err := c.parseEmail(msg, bodySection)
if err != nil {
results <- emailResult{email, err}
continue
}
results <- emailResult{Email: email}
if err := <-done; err != nil {
results <- emailResultFromError(err)
}
}
close(results)
}()
return results
}
func (c *Client) parseEmail(msg *imap.Message, bodySection *imap.BodySectionName) (*EMail, error) {
r := msg.GetBody(bodySection)
mr, err := mail.CreateReader(r)
if err != nil {
return nil, err
}
email := EMail{
Uid: msg.Uid,
Subject: msg.Envelope.Subject,
From: msg.Envelope.From,
Attachments: make(map[string][]byte),
}
for {
p, err := mr.NextPart()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
switch h := p.Header.(type) {
case *mail.InlineHeader:
// This is the message's text (can be plain-text or HTML)
b, _ := io.ReadAll(p.Body)
ctype, _, _ := h.ContentType()
switch ctype {
case "text/html":
email.Html = string(b)
break
case "text/plain":
case "text":
email.PlainText = string(b)
break
default:
break
}
case *mail.AttachmentHeader:
filename, _ := h.Filename()
b, _ := io.ReadAll(p.Body)
email.Attachments[filename] = b
}
}
if email.PlainText == "" {
text, err := html2text.FromString(email.Html)
if err != nil {
return nil, err
}
email.PlainText = text
}
return &email, nil
}
// Close connection and delete all messages marked as delete
func (c *Client) Close() error {
if err := c.imap.Close(); err != nil {
return err
}
return nil
}