/usr/share/gocode/src/github.com/labstack/gommon/email/email.go is in golang-github-labstack-gommon-dev 0.2.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package email
import (
"bytes"
"crypto/tls"
"html/template"
"net/mail"
"net/smtp"
"net"
"time"
"github.com/labstack/gommon/random"
)
type (
Email struct {
Auth smtp.Auth
Header map[string]string
Template *template.Template
smtpAddress string
}
Message struct {
ID string `json:"id"`
From string `json:"from"`
To string `json:"to"`
CC string `json:"cc"`
Subject string `json:"subject"`
Text string `json:"text"`
HTML string `json:"html"`
Inlines []*File `json:"inlines"`
Attachments []*File `json:"attachments"`
buffer *bytes.Buffer
boundary string
}
File struct {
Name string
Type string
Content string
}
)
func New(smtpAddress string) *Email {
return &Email{
smtpAddress: smtpAddress,
Header: map[string]string{},
}
}
func (m *Message) writeHeader(key, value string) {
m.buffer.WriteString(key)
m.buffer.WriteString(": ")
m.buffer.WriteString(value)
m.buffer.WriteString("\r\n")
}
func (m *Message) writeBoundary() {
m.buffer.WriteString("--")
m.buffer.WriteString(m.boundary)
m.buffer.WriteString("\r\n")
}
func (m *Message) writeText(content string, contentType string) {
m.writeBoundary()
m.writeHeader("Content-Type", contentType+"; charset=UTF-8")
m.buffer.WriteString("\r\n")
m.buffer.WriteString(content)
m.buffer.WriteString("\r\n")
m.buffer.WriteString("\r\n")
}
func (m *Message) writeFile(f *File, disposition string) {
m.writeBoundary()
m.writeHeader("Content-Type", f.Type+`; name="`+f.Name+`"`)
m.writeHeader("Content-Disposition", disposition+`; filename="`+f.Name+`"`)
m.writeHeader("Content-Transfer-Encoding", "base64")
m.buffer.WriteString("\r\n")
m.buffer.WriteString(f.Content)
m.buffer.WriteString("\r\n")
m.buffer.WriteString("\r\n")
}
func (e *Email) Send(m *Message) (err error) {
// Message header
m.buffer = bytes.NewBuffer(make([]byte, 256))
m.buffer.Reset()
m.boundary = random.String(16)
m.writeHeader("MIME-Version", "1.0")
m.writeHeader("Message-ID", m.ID)
m.writeHeader("Date", time.Now().Format(time.RFC1123Z))
m.writeHeader("From", m.From)
m.writeHeader("To", m.To)
if m.CC != "" {
m.writeHeader("CC", m.CC)
}
if m.Subject != "" {
m.writeHeader("Subject", m.Subject)
}
// Extra
for k, v := range e.Header {
m.writeHeader(k, v)
}
m.writeHeader("Content-Type", "multipart/mixed; boundary="+m.boundary)
m.buffer.WriteString("\r\n")
// Message body
if m.Text != "" {
m.writeText(m.Text, "text/plain")
} else if m.HTML != "" {
m.writeText(m.HTML, "text/html")
} else {
// TODO:
}
// Inlines/attachments
for _, f := range m.Inlines {
m.writeFile(f, "inline")
}
for _, f := range m.Attachments {
m.writeFile(f, "attachment")
}
m.buffer.WriteString("--")
m.buffer.WriteString(m.boundary)
m.buffer.WriteString("--")
// Dial
c, err := smtp.Dial(e.smtpAddress)
if err != nil {
return
}
defer c.Close()
// Check if TLS is required
if ok, _ := c.Extension("STARTTLS"); ok {
host, _, _ := net.SplitHostPort(e.smtpAddress)
config := &tls.Config{ServerName: host}
if err = c.StartTLS(config); err != nil {
return err
}
}
// Authenticate
if e.Auth != nil {
if err = c.Auth(e.Auth); err != nil {
return
}
}
// Send message
from, err := mail.ParseAddress(m.From)
if err != nil {
return
}
if err = c.Mail(from.Address); err != nil {
return
}
to, err := mail.ParseAddressList(m.To)
if err != nil {
return
}
for _, a := range to {
if err = c.Rcpt(a.Address); err != nil {
return
}
}
wc, err := c.Data()
if err != nil {
return
}
defer wc.Close()
_, err = m.buffer.WriteTo(wc)
return
}
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