// Copyright (c) 2015 Spinpunch, Inc. All Rights Reserved. // See License.txt for license information. package utils import ( l4g "code.google.com/p/log4go" "crypto/tls" "fmt" "github.com/mattermost/platform/model" "net" "net/mail" "net/smtp" ) func CheckMailSettings() *model.AppError { if len(Cfg.EmailSettings.SMTPServer) == 0 { return model.NewAppError("CheckMailSettings", "No email settings present, mail will not be sent", "") } conn, err := connectToSMTPServer() if err != nil { return err } defer conn.Close() c, err2 := newSMTPClient(conn) if err2 != nil { return err } defer c.Quit() defer c.Close() return nil } func connectToSMTPServer() (net.Conn, *model.AppError) { host, _, _ := net.SplitHostPort(Cfg.EmailSettings.SMTPServer) var conn net.Conn var err error if Cfg.EmailSettings.UseTLS { tlsconfig := &tls.Config{ InsecureSkipVerify: true, ServerName: host, } conn, err = tls.Dial("tcp", Cfg.EmailSettings.SMTPServer, tlsconfig) if err != nil { return nil, model.NewAppError("SendMail", "Failed to open TLS connection", err.Error()) } } else { conn, err = net.Dial("tcp", Cfg.EmailSettings.SMTPServer) if err != nil { return nil, model.NewAppError("SendMail", "Failed to open connection", err.Error()) } } return conn, nil } func newSMTPClient(conn net.Conn) (*smtp.Client, *model.AppError) { host, _, _ := net.SplitHostPort(Cfg.EmailSettings.SMTPServer) c, err := smtp.NewClient(conn, host) if err != nil { l4g.Error("Failed to open a connection to SMTP server %v", err) return nil, model.NewAppError("SendMail", "Failed to open TLS connection", err.Error()) } // GO does not support plain auth over a non encrypted connection. // so if not tls then no auth auth := smtp.PlainAuth("", Cfg.EmailSettings.SMTPUsername, Cfg.EmailSettings.SMTPPassword, host) if Cfg.EmailSettings.UseTLS { if err = c.Auth(auth); err != nil { return nil, model.NewAppError("SendMail", "Failed to authenticate on SMTP server", err.Error()) } } return c, nil } func SendMail(to, subject, body string) *model.AppError { fromMail := mail.Address{"", Cfg.EmailSettings.FeedbackEmail} toMail := mail.Address{"", to} headers := make(map[string]string) headers["From"] = fromMail.String() headers["To"] = toMail.String() headers["Subject"] = subject headers["MIME-version"] = "1.0" headers["Content-Type"] = "text/html" message := "" for k, v := range headers { message += fmt.Sprintf("%s: %s\r\n", k, v) } message += "\r\n" + body + "" if len(Cfg.EmailSettings.SMTPServer) == 0 { l4g.Warn("Skipping sending of email because EmailSettings are not configured") return nil } conn, err1 := connectToSMTPServer() if err1 != nil { return err1 } defer conn.Close() c, err2 := newSMTPClient(conn) if err2 != nil { return err2 } defer c.Quit() defer c.Close() if err := c.Mail(fromMail.Address); err != nil { return model.NewAppError("SendMail", "Failed to add from email address", err.Error()) } if err := c.Rcpt(toMail.Address); err != nil { return model.NewAppError("SendMail", "Failed to add to email address", err.Error()) } w, err := c.Data() if err != nil { return model.NewAppError("SendMail", "Failed to add email messsage data", err.Error()) } _, err = w.Write([]byte(message)) if err != nil { return model.NewAppError("SendMail", "Failed to write email message", err.Error()) } err = w.Close() if err != nil { return model.NewAppError("SendMail", "Failed to close connection to SMTP server", err.Error()) } return nil }