mirror of
https://github.com/1f349/simplemail.git
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97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package simplemail
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import (
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"bytes"
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"github.com/emersion/go-message/mail"
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"github.com/emersion/go-sasl"
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"github.com/emersion/go-smtp"
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"io"
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"net"
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"time"
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)
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type Mail struct {
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Name string `json:"name"`
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Tls bool `json:"tls"`
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Server string `json:"server"`
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From FromAddress `json:"from"`
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Username string `json:"username"`
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Password string `json:"password"`
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}
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func (m *Mail) loginInfo() sasl.Client {
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return sasl.NewPlainClient("", m.Username, m.Password)
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}
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func (m *Mail) mailCall(to []string, r io.Reader) error {
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host, _, err := net.SplitHostPort(m.Server)
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if err != nil {
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return err
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}
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if m.Tls {
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return smtp.SendMailTLS(m.Server, m.loginInfo(), m.From.String(), to, r)
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}
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if host == "localhost" || host == "127.0.0.1" {
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// internals of smtp.SendMail without STARTTLS for localhost testing
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dial, err := smtp.Dial(m.Server)
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if err != nil {
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return err
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}
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err = dial.Auth(m.loginInfo())
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if err != nil {
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return err
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}
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return dial.SendMail(m.From.String(), to, r)
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}
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return smtp.SendMail(m.Server, m.loginInfo(), m.From.String(), to, r)
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}
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func (m *Mail) SendMail(subject string, to []*mail.Address, htmlBody, textBody io.Reader) error {
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// generate the email in this template
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buf := new(bytes.Buffer)
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// setup mail headers
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var h mail.Header
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h.SetDate(time.Now())
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h.SetSubject(subject)
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h.SetAddressList("From", []*mail.Address{m.From.Address})
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h.SetAddressList("To", to)
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h.Set("Content-Type", "multipart/alternative")
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// setup html and text alternative headers
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var hHtml, hTxt mail.InlineHeader
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hHtml.Set("Content-Type", "text/html; charset=utf-8")
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hTxt.Set("Content-Type", "text/plain; charset=utf-8")
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createWriter, err := mail.CreateWriter(buf, h)
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if err != nil {
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return err
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}
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inline, err := createWriter.CreateInline()
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if err != nil {
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return err
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}
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partHtml, err := inline.CreatePart(hHtml)
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if err != nil {
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return err
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}
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if _, err := io.Copy(partHtml, htmlBody); err != nil {
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return err
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}
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partTxt, err := inline.CreatePart(hTxt)
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if err != nil {
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return err
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}
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if _, err := io.Copy(partTxt, textBody); err != nil {
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return err
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}
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// convert all to addresses to strings
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toStr := make([]string, len(to))
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for i := range toStr {
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toStr[i] = to[i].String()
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}
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return m.mailCall(toStr, buf)
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}
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