closed-social
/
gitea

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package mailer
import (	"crypto/tls"	"fmt"	"io"	"net"	"net/smtp"	"os"	"os/exec"	"strings"	"time"
	"code.gitea.io/gitea/modules/base"	"code.gitea.io/gitea/modules/log"	"code.gitea.io/gitea/modules/setting"
	"github.com/jaytaylor/html2text"	"gopkg.in/gomail.v2")
// Message mail body and log info
type Message struct {	Info string // Message information for log purpose.
	*gomail.Message}
// NewMessageFrom creates new mail message object with custom From header.
func NewMessageFrom(to []string, fromDisplayName, fromAddress, subject, body string) *Message {	log.Trace("NewMessageFrom (body):\n%s", body)
	msg := gomail.NewMessage()	msg.SetAddressHeader("From", fromAddress, fromDisplayName)	msg.SetHeader("To", to...)	msg.SetHeader("Subject", subject)	msg.SetDateHeader("Date", time.Now())
	plainBody, err := html2text.FromString(body)	if err != nil || setting.MailService.SendAsPlainText {		if strings.Contains(base.TruncateString(body, 100), "<html>") {			log.Warn("Mail contains HTML but configured to send as plain text.")		}		msg.SetBody("text/plain", plainBody)	} else {		msg.SetBody("text/plain", plainBody)		msg.AddAlternative("text/html", body)	}
	return &Message{		Message: msg,	}}
// NewMessage creates new mail message object with default From header.
func NewMessage(to []string, subject, body string) *Message {	return NewMessageFrom(to, setting.MailService.FromName, setting.MailService.FromEmail, subject, body)}
type loginAuth struct {	username, password string}
// LoginAuth SMTP AUTH LOGIN Auth Handler
func LoginAuth(username, password string) smtp.Auth {	return &loginAuth{username, password}}
// Start start SMTP login auth
func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {	return "LOGIN", []byte{}, nil}
// Next next step of SMTP login auth
func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {	if more {		switch string(fromServer) {		case "Username:":			return []byte(a.username), nil		case "Password:":			return []byte(a.password), nil		default:			return nil, fmt.Errorf("unknown fromServer: %s", string(fromServer))		}	}	return nil, nil}
// Sender SMTP mail sender
type smtpSender struct {}
// Send send email
func (s *smtpSender) Send(from string, to []string, msg io.WriterTo) error {	opts := setting.MailService
	host, port, err := net.SplitHostPort(opts.Host)	if err != nil {		return err	}
	tlsconfig := &tls.Config{		InsecureSkipVerify: opts.SkipVerify,		ServerName:         host,	}
	if opts.UseCertificate {		cert, err := tls.LoadX509KeyPair(opts.CertFile, opts.KeyFile)		if err != nil {			return err		}		tlsconfig.Certificates = []tls.Certificate{cert}	}
	conn, err := net.Dial("tcp", net.JoinHostPort(host, port))	if err != nil {		return err	}	defer conn.Close()
	isSecureConn := false	// Start TLS directly if the port ends with 465 (SMTPS protocol)
	if strings.HasSuffix(port, "465") {		conn = tls.Client(conn, tlsconfig)		isSecureConn = true	}
	client, err := smtp.NewClient(conn, host)	if err != nil {		return fmt.Errorf("NewClient: %v", err)	}
	if !opts.DisableHelo {		hostname := opts.HeloHostname		if len(hostname) == 0 {			hostname, err = os.Hostname()			if err != nil {				return err			}		}
		if err = client.Hello(hostname); err != nil {			return fmt.Errorf("Hello: %v", err)		}	}
	// If not using SMTPS, always use STARTTLS if available
	hasStartTLS, _ := client.Extension("STARTTLS")	if !isSecureConn && hasStartTLS {		if err = client.StartTLS(tlsconfig); err != nil {			return fmt.Errorf("StartTLS: %v", err)		}	}
	canAuth, options := client.Extension("AUTH")	if canAuth && len(opts.User) > 0 {		var auth smtp.Auth
		if strings.Contains(options, "CRAM-MD5") {			auth = smtp.CRAMMD5Auth(opts.User, opts.Passwd)		} else if strings.Contains(options, "PLAIN") {			auth = smtp.PlainAuth("", opts.User, opts.Passwd, host)		} else if strings.Contains(options, "LOGIN") {			// Patch for AUTH LOGIN
			auth = LoginAuth(opts.User, opts.Passwd)		}
		if auth != nil {			if err = client.Auth(auth); err != nil {				return fmt.Errorf("Auth: %v", err)			}		}	}
	if err = client.Mail(from); err != nil {		return fmt.Errorf("Mail: %v", err)	}
	for _, rec := range to {		if err = client.Rcpt(rec); err != nil {			return fmt.Errorf("Rcpt: %v", err)		}	}
	w, err := client.Data()	if err != nil {		return fmt.Errorf("Data: %v", err)	} else if _, err = msg.WriteTo(w); err != nil {		return fmt.Errorf("WriteTo: %v", err)	} else if err = w.Close(); err != nil {		return fmt.Errorf("Close: %v", err)	}
	return client.Quit()}
// Sender sendmail mail sender
type sendmailSender struct {}
// Send send email
func (s *sendmailSender) Send(from string, to []string, msg io.WriterTo) error {	var err error	var closeError error	var waitError error
	args := []string{"-F", from, "-i"}	args = append(args, to...)	log.Trace("Sending with: %s %v", setting.MailService.SendmailPath, args)	cmd := exec.Command(setting.MailService.SendmailPath, args...)	pipe, err := cmd.StdinPipe()
	if err != nil {		return err	}
	if err = cmd.Start(); err != nil {		return err	}
	_, err = msg.WriteTo(pipe)
	// we MUST close the pipe or sendmail will hang waiting for more of the message
	// Also we should wait on our sendmail command even if something fails
	closeError = pipe.Close()	waitError = cmd.Wait()	if err != nil {		return err	} else if closeError != nil {		return closeError	} else {		return waitError	}}
func processMailQueue() {	for {		select {		case msg := <-mailQueue:			log.Trace("New e-mail sending request %s: %s", msg.GetHeader("To"), msg.Info)			if err := gomail.Send(Sender, msg.Message); err != nil {				log.Error(3, "Failed to send emails %s: %s - %v", msg.GetHeader("To"), msg.Info, err)			} else {				log.Trace("E-mails sent %s: %s", msg.GetHeader("To"), msg.Info)			}		}	}}
var mailQueue chan *Message
// Sender sender for sending mail synchronously
var Sender gomail.Sender
// NewContext start mail queue service
func NewContext() {	// Need to check if mailQueue is nil because in during reinstall (user had installed
	// before but swithed install lock off), this function will be called again
	// while mail queue is already processing tasks, and produces a race condition.
	if setting.MailService == nil || mailQueue != nil {		return	}
	if setting.MailService.UseSendmail {		Sender = &sendmailSender{}	} else {		Sender = &smtpSender{}	}
	mailQueue = make(chan *Message, setting.MailService.QueueLength)	go processMailQueue()}
// SendAsync send mail asynchronous
func SendAsync(msg *Message) {	go func() {		mailQueue <- msg	}()}