vendor dependencies with dep

vendor/gopkg.in/gomail.v2/smtp.go

@@ -0,0 +1,175 @@
+package gomail
+
+import (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/smtp"
+)
+
+// A Dialer is a dialer to an SMTP server.
+type Dialer struct {
+	// Host represents the host of the SMTP server.
+	Host string
+	// Port represents the port of the SMTP server.
+	Port int
+	// Auth represents the authentication mechanism used to authenticate to the
+	// SMTP server.
+	Auth smtp.Auth
+	// SSL defines whether an SSL connection is used. It should be false in
+	// most cases since the authentication mechanism should use the STARTTLS
+	// extension instead.
+	SSL bool
+	// TSLConfig represents the TLS configuration used for the TLS (when the
+	// STARTTLS extension is used) or SSL connection.
+	TLSConfig *tls.Config
+}
+
+// NewPlainDialer returns a Dialer. The given parameters are used to connect to
+// the SMTP server via a PLAIN authentication mechanism.
+//
+// It fallbacks to the LOGIN mechanism if it is the only mechanism advertised by
+// the server.
+func NewPlainDialer(host string, port int, username, password string) *Dialer {
+	return &Dialer{
+		Host: host,
+		Port: port,
+		Auth: &plainAuth{
+			username: username,
+			password: password,
+			host:     host,
+		},
+		SSL: port == 465,
+	}
+}
+
+// Dial dials and authenticates to an SMTP server. The returned SendCloser
+// should be closed when done using it.
+func (d *Dialer) Dial() (SendCloser, error) {
+	c, err := d.dial()
+	if err != nil {
+		return nil, err
+	}
+
+	if d.Auth != nil {
+		if ok, _ := c.Extension("AUTH"); ok {
+			if err = c.Auth(d.Auth); err != nil {
+				c.Close()
+				return nil, err
+			}
+		}
+	}
+
+	return &smtpSender{c}, nil
+}
+
+func (d *Dialer) dial() (smtpClient, error) {
+	if d.SSL {
+		return d.sslDial()
+	}
+	return d.starttlsDial()
+}
+
+func (d *Dialer) starttlsDial() (smtpClient, error) {
+	c, err := smtpDial(addr(d.Host, d.Port))
+	if err != nil {
+		return nil, err
+	}
+
+	if ok, _ := c.Extension("STARTTLS"); ok {
+		if err := c.StartTLS(d.tlsConfig()); err != nil {
+			c.Close()
+			return nil, err
+		}
+	}
+
+	return c, nil
+}
+
+func (d *Dialer) sslDial() (smtpClient, error) {
+	conn, err := tlsDial("tcp", addr(d.Host, d.Port), d.tlsConfig())
+	if err != nil {
+		return nil, err
+	}
+
+	return newClient(conn, d.Host)
+}
+
+func (d *Dialer) tlsConfig() *tls.Config {
+	if d.TLSConfig == nil {
+		return &tls.Config{ServerName: d.Host}
+	}
+
+	return d.TLSConfig
+}
+
+func addr(host string, port int) string {
+	return fmt.Sprintf("%s:%d", host, port)
+}
+
+// DialAndSend opens a connection to the SMTP server, sends the given emails and
+// closes the connection.
+func (d *Dialer) DialAndSend(m ...*Message) error {
+	s, err := d.Dial()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	return Send(s, m...)
+}
+
+type smtpSender struct {
+	smtpClient
+}
+
+func (c *smtpSender) Send(from string, to []string, msg io.WriterTo) error {
+	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
+	}
+
+	if _, err = msg.WriteTo(w); err != nil {
+		w.Close()
+		return err
+	}
+
+	return w.Close()
+}
+
+func (c *smtpSender) Close() error {
+	return c.Quit()
+}
+
+// Stubbed out for tests.
+var (
+	smtpDial = func(addr string) (smtpClient, error) {
+		return smtp.Dial(addr)
+	}
+	tlsDial   = tls.Dial
+	newClient = func(conn net.Conn, host string) (smtpClient, error) {
+		return smtp.NewClient(conn, host)
+	}
+)
+
+type smtpClient interface {
+	Extension(string) (bool, string)
+	StartTLS(*tls.Config) error
+	Auth(smtp.Auth) error
+	Mail(string) error
+	Rcpt(string) error
+	Data() (io.WriteCloser, error)
+	Quit() error
+	Close() error
+}