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update from the standard library #126

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update from the standard library #126

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6e345ff
update from the standard library
Sep 22, 2020
1180348
Added timeout
Sep 22, 2020
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55 changes: 42 additions & 13 deletions email.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import (
"mime"
"mime/multipart"
"mime/quotedprintable"
"net"
"net/mail"
"net/smtp"
"net/textproto"
Expand Down Expand Up @@ -51,6 +52,7 @@ type Email struct {
Headers textproto.MIMEHeader
Attachments []*Attachment
ReadReceipt []string
timeout time.Duration
}

// part is a copyable representation of a multipart.Part
Expand Down Expand Up @@ -177,7 +179,7 @@ func NewEmailFromReader(r io.Reader) (*Email, error) {
return e, err
}
filename, filenameDefined := params["filename"]
if cd == "attachment" || (cd == "inline" && filenameDefined){
if cd == "attachment" || (cd == "inline" && filenameDefined) {
_, err = e.Attach(bytes.NewReader(p.body), filename, ct)
if err != nil {
return e, err
Expand Down Expand Up @@ -555,6 +557,13 @@ func (e *Email) parseSender() (string, error) {
}
}

// Timeout sets a timeout to use in custom SendWith* functions.
// Further calls to SendWith* functions reset this value.
func (e *Email) Timeout(t time.Duration) *Email {
e.timeout = t
return e
}

// SendWithTLS sends an email over tls with an optional TLS config.
//
// The TLS Config is helpful if you need to connect to a host that is used an untrusted
Expand Down Expand Up @@ -583,7 +592,16 @@ func (e *Email) SendWithTLS(addr string, a smtp.Auth, t *tls.Config) error {
return err
}

conn, err := tls.Dial("tcp", addr, t)
var conn *tls.Conn
if e.timeout == 0 {
conn, err = tls.Dial("tcp", addr, t)
} else {
dialer := net.Dialer{
Timeout: e.timeout,
}
e.timeout = 0
conn, err = tls.DialWithDialer(&dialer, "tcp", addr, t)
}
if err != nil {
return err
}
Expand All @@ -598,10 +616,11 @@ func (e *Email) SendWithTLS(addr string, a smtp.Auth, t *tls.Config) error {
}

if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
if ok, _ := c.Extension("AUTH"); !ok {
return errors.New("smtp: server doesn't support AUTH")
}
if err = c.Auth(a); err != nil {
return err
}
}
if err = c.Mail(sender); err != nil {
Expand Down Expand Up @@ -657,26 +676,36 @@ func (e *Email) SendWithStartTLS(addr string, a smtp.Auth, t *tls.Config) error

// Taken from the standard library
// https://github.com/golang/go/blob/master/src/net/smtp/smtp.go#L328
c, err := smtp.Dial(addr)
var c *smtp.Client
if e.timeout == 0 {
c, err = smtp.Dial(addr)
} else {
conn, err := net.DialTimeout("tcp", addr, e.timeout)
e.timeout = 0
if err != nil {
return err
}
host, _, _ := net.SplitHostPort(addr)
c, err = smtp.NewClient(conn, host)
}
if err != nil {
return err
}
defer c.Close()
if err = c.Hello("localhost"); err != nil {
return err
}
// Use TLS if available
if ok, _ := c.Extension("STARTTLS"); ok {
if err = c.StartTLS(t); err != nil {
return err
}
}

if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
if ok, _ := c.Extension("AUTH"); !ok {
return errors.New("smtp: server doesn't support AUTH")
}
if err = c.Auth(a); err != nil {
return err
}
}
if err = c.Mail(sender); err != nil {
Expand Down