74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package main
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import (
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"crypto/tls"
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"fmt"
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"net/smtp"
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"strings"
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)
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type Emailer struct {
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From string
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SMTP string
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POP3 string
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Password string
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}
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func (e *Emailer) Send(to, subj, msg string) error {
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headers := e.headers(to, e.From, subj)
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body := e.body(headers, msg)
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smtp, err := e.smtp()
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if err != nil {
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return err
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}
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defer smtp.Quit()
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if err := smtp.Mail(e.From); err != nil {
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return err
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}
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if err := smtp.Rcpt(to); err != nil {
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return err
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}
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w, err := smtp.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([]byte(body)); err != nil {
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return err
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}
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return w.Close()
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}
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func (e *Emailer) headers(to, from, subj string) map[string]string {
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return map[string]string{
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"To": to,
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"From": from,
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"Subject": subj,
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}
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}
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func (e *Emailer) body(headers map[string]string, body string) string {
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b := ""
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for k, v := range headers {
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b += fmt.Sprintf("%s: %s\r\n", k, v)
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}
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return b + "\r\n" + body
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}
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func (e *Emailer) smtp() (*smtp.Client, error) {
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host := strings.Split(e.SMTP, ":")[0]
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auth := smtp.PlainAuth("", e.From, e.Password, host)
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tlsconfig := &tls.Config{ServerName: host}
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conn, err := tls.Dial("tcp", e.SMTP, tlsconfig)
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if err != nil {
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return nil, fmt.Errorf("cannot dial %v: %v", e.SMTP, err)
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}
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smtp, err := smtp.NewClient(conn, host)
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if err != nil {
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return nil, fmt.Errorf("cannot new client %v: %v", host, err)
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}
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if err := smtp.Auth(auth); err != nil {
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return nil, fmt.Errorf("cannot auth client: %v", err)
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}
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return smtp, nil
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}
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