forked from wheelcomplex/kmg
/
SmtpSendEmail.go
106 lines (100 loc) · 2.17 KB
/
SmtpSendEmail.go
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package kmgEmail
import (
"bytes"
"crypto/tls"
"net"
"net/smtp"
"strings"
"text/template"
"github.com/bronze1man/kmg/kmgLog"
"github.com/bronze1man/kmg/kmgNet"
"github.com/bronze1man/kmg/kmgNet/kmgProxy"
)
func SmtpSendEmail(req *SmtpRequest) (err error) {
parameters := &struct {
From string
To string
Subject string
Message string
}{
req.From,
strings.Join([]string(req.To), ","),
req.Subject,
req.Message,
}
buffer := new(bytes.Buffer)
t := template.Must(template.New("emailTemplate").Parse(_EmailScript()))
t.Execute(buffer, parameters)
auth := smtp.PlainAuth("", req.From, req.SmtpPassword, req.SmtpHost)
var conn net.Conn
if req.Socks4aProxyAddr != "" {
conn, err = kmgProxy.Socks4aDial(req.Socks4aProxyAddr, kmgNet.JoinHostPortInt(req.SmtpHost, req.SmtpPort))
} else {
conn, err = net.Dial("tcp", kmgNet.JoinHostPortInt(req.SmtpHost, req.SmtpPort))
}
if err != nil {
kmgLog.Log("Email", "1", err.Error())
return
}
c, err := smtp.NewClient(conn, req.SmtpHost)
if err != nil {
kmgLog.Log("Email", err.Error())
return
}
err = smtpSendMailPart2(c,
req.SmtpHost,
auth,
req.From,
req.To,
buffer.Bytes())
return err
}
func smtpSendMailPart2(c *smtp.Client, smtpHost string, a smtp.Auth, from string, to []string, msg []byte) (err error) {
defer c.Close()
if err = c.Hello("localhost"); err != nil {
return err
}
if ok, _ := c.Extension("STARTTLS"); ok {
config := &tls.Config{ServerName: smtpHost}
if err = c.StartTLS(config); err != nil {
return err
}
}
if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
}
}
if err = c.Mail(from); err != nil {
return err
}
for _, addr := range to {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(msg)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
// _EmailScript returns a template for the email message to be sent
func _EmailScript() (script string) {
return `From: {{.From}}
To: {{.To}}
Subject: {{.Subject}}
MIME-version: 1.0
Content-Type: text/html; charset="UTF-8"
{{.Message}}`
}