47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package mailyak
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import (
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"bytes"
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"net"
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)
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// senderWithStartTLS connects to the remote SMTP server, upgrades the
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// connection using STARTTLS if available, and sends the email.
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type senderWithStartTLS struct {
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hostAndPort string
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hostname string
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buf *bytes.Buffer
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}
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func (s *senderWithStartTLS) Send(m sendableMail) error {
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conn, err := net.Dial("tcp", s.hostAndPort)
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if err != nil {
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return err
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}
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defer func() { _ = conn.Close() }()
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return smtpExchange(m, conn, s.hostname, true)
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}
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func newSenderWithStartTLS(hostAndPort string) *senderWithStartTLS {
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hostName, _, err := net.SplitHostPort(hostAndPort)
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if err != nil {
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// Really this should be an error, but we can't return it from the New()
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// constructor without breaking compatability. Fortunately by the time
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// it gets to the dial() the user will get a pretty clear error as this
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// hostAndPort value is almost certainly invalid.
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//
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// This hostname must be split from the port so the correct value is
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// used when performing the SMTP AUTH as the Go SMTP implementation
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// refuses to send credentials over non-localhost plaintext connections,
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// and including the port messes this check up (and is probably the
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// wrong thing to be sending anyway).
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hostName = hostAndPort
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}
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return &senderWithStartTLS{
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hostAndPort: hostAndPort,
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hostname: hostName,
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buf: &bytes.Buffer{},
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}
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}
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