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84 lines
1.5 KiB
84 lines
1.5 KiB
package mailinglist
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import (
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"github.com/emersion/go-sasl"
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"github.com/emersion/go-smtp"
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)
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// Mailer is used to deliver emails to arbitrary recipients.
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type Mailer interface {
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Send(to, subject, body string) error
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}
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// NullMailer acts as a Mailer but actually just does nothing.
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var NullMailer = nullMailer{}
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type nullMailer struct{}
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func (nullMailer) Send(to, subject, body string) error {
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return nil
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}
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// MailerParams are used to initialize a new Mailer instance
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type MailerParams struct {
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SMTPAddr string
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// Optional, if not given then no auth is attempted.
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SMTPAuth sasl.Client
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// The sending email address to use for all emails being sent.
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SendAs string
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}
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type mailer struct {
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params MailerParams
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}
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// NewMailer initializes and returns a Mailer which will use an external SMTP
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// server to deliver email.
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func NewMailer(params MailerParams) Mailer {
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return &mailer{
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params: params,
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}
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}
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func (m *mailer) Send(to, subject, body string) error {
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msg := []byte("From: " + m.params.SendAs + "\r\n" +
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"To: " + to + "\r\n" +
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"Subject: " + subject + "\r\n\r\n" +
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body + "\r\n")
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c, err := smtp.Dial(m.params.SMTPAddr)
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if err != nil {
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return err
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}
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defer c.Close()
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if err = c.Auth(m.params.SMTPAuth); err != nil {
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return err
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}
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if err = c.Mail(m.params.SendAs, nil); err != nil {
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return err
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}
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if err = c.Rcpt(to); err != nil {
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return err
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}
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w, err := c.Data()
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if err != nil {
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return err
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}
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if _, err = w.Write(msg); err != nil {
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return err
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}
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if err = w.Close(); err != nil {
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return err
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}
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return c.Quit()
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}
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