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send.go
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send.go
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package main
import (
"fmt"
"net"
"os"
"flag"
"time"
"bufio"
"syscall"
"strings"
"math/rand"
"crypto/tls"
"net/smtp"
"encoding/base64"
"golang.org/x/crypto/ssh/terminal"
"github.com/pkg/errors"
"golang.org/x/net/proxy"
)
var userName, password string
var proxyAddress, smtpAddress string
type _PlainAuth struct {
identity, username, password string
host string
}
func (a *_PlainAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
if server.Name != a.host {
return "", nil, errors.New("wrong host name")
}
resp := []byte(a.identity + "\x00" + a.username + "\x00" + a.password)
return "PLAIN", resp, nil
}
func (a *_PlainAuth) Next(from_server []byte, more bool) ([]byte, error) {
if more {
// We've already sent everything.
return nil, errors.New("unexpected server challenge")
}
return nil, nil
}
func baseEncode(s string) string {
return fmt.Sprintf("=?UTF-8?B?%s?=", base64.StdEncoding.EncodeToString([]byte(s)))
}
func plainAuth(identity, username, password string,
host string) smtp.Auth {
return &_PlainAuth{identity, username, password,
host}
}
func init() {
flag.StringVar(&proxyAddress, "proxy", "", "Send mail (SMTP) server proxy address")
flag.StringVar(&smtpAddress, "smtp", "smtp.gmail.com:587", "Send mail (SMTP) server address")
}
func setupMailCredentials(enterUsernameTip, enterPasswordTip string) {
reader := bufio.NewReader(os.Stdin)
fmt.Print(enterUsernameTip)
userName, _ = reader.ReadString('\n')
fmt.Print(enterPasswordTip)
bytePassword, err := terminal.ReadPassword(int(syscall.Stdin))
fmt.Println("")
if err != nil {
fmt.Println(err)
}
password = string(bytePassword)
userName = strings.TrimSpace(userName)
// fmt.Println(userName, password, proxyAddress, smtpAddress)
}
func SendMail(to string, subjcet string, body string) (error) {
if "" == userName {
return errors.New("userName is empty")
} else if "" == password {
return errors.New("password is empty")
}
var c *smtp.Client
var err error
if "" != proxyAddress {
dialer, err := proxy.SOCKS5("tcp", proxyAddress, nil, proxy.Direct)
if err != nil {
return err
}
conn, err := dialer.Dial("tcp", smtpAddress)
if err != nil {
return err
}
host, _, _ := net.SplitHostPort(smtpAddress)
c, err = smtp.NewClient(conn, host)
} else {
c, err = smtp.Dial(smtpAddress)
}
if err != nil {
return err
}
defer c.Close()
if err := c.Hello("localhost"); err != nil {
return err
}
host, _, err := net.SplitHostPort(smtpAddress)
if err != nil {
return err
}
if ok, _ := c.Extension("STARTTLS"); ok {
spli := strings.Split(smtpAddress, ":")
if 2 != len(spli) {
return errors.New("smtpAddress is an invalid value")
}
c.StartTLS( &tls.Config { ServerName: spli[0] } )
}
auth := plainAuth ( "", userName, password, host )
if err = c.Auth(auth); err != nil {
return err
}
// 设置发件人
if err := c.Mail(userName); err != nil {
return err
}
// 设置接收人
if err = c.Rcpt(to); err != nil {
return err
}
w, err := c.Data()
if err != nil {
return err
}
hostname, err := os.Hostname()
if err != nil {
return err
}
headers := map[string]string{}
headers["Subject"] = baseEncode(subjcet)
headers["To"] = to
headers["From"] = userName
headers["MIME-Version"] = "1.0"
headers["Content-Type"] = "text/html; charset=UTF-8"
headers["Message-ID"] = fmt.Sprintf("<%f.%d@%s>", rand.Float64(),
time.Now().UnixNano(), hostname)
msg := ""
for k, v := range headers {
msg += fmt.Sprintf("%s: %s\r\n", k, v)
}
msg += fmt.Sprintf("\r\n" + body)
if _, err := w.Write([]byte(msg)); err != nil {
return err
}
if err := w.Close(); err != nil {
return err
}
return nil
}