You've already forked golang-base-project
60 lines
2.0 KiB
Go
60 lines
2.0 KiB
Go
// Package email handles the sending of emails
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package email
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import (
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"bytes"
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"fmt"
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"github.com/uberswe/golang-base-project/config"
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"github.com/uberswe/golang-base-project/text"
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"log"
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"mime/multipart"
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"net/smtp"
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"strings"
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)
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// Service holds a golang-base-project config.Config and provides functions to send emails
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type Service struct {
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Config config.Config
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}
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// New takes a golang-base-project config.Config and returns an instance of Service
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func New(c config.Config) Service {
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return Service{
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Config: c,
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}
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}
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// Send sends an email with the provided subject and message to the provided email.
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func (s Service) Send(to string, subject string, message string) {
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// Authentication.
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auth := smtp.PlainAuth("", s.Config.SMTPUsername, s.Config.SMTPPassword, s.Config.SMTPHost)
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// RFC #822 Standard
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writer := multipart.NewWriter(bytes.NewBufferString(""))
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var b bytes.Buffer
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_, _ = fmt.Fprintf(&b, "From: %s\r\nTo: %s\r\nSubject: %s\r\n", s.Config.SMTPSender, to, subject)
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_, _ = fmt.Fprintf(&b, "MIME-Version: 1.0\r\n")
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_, _ = fmt.Fprintf(&b, "Content-Type: multipart/alternative; charset=\"UTF-8\"; boundary=\"%s\"\r\n", writer.Boundary())
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_, _ = fmt.Fprintf(&b, "\r\n\r\n--%s\r\nContent-Type: %s; charset=UTF-8;\nContent-Transfer-Encoding: 8bit\r\n\r\n", writer.Boundary(), "text/plain")
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b.Write([]byte(message))
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htmlMessage := text.LinkToHTMLLink(message)
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htmlMessage = text.Nl2Br(htmlMessage)
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_, _ = fmt.Fprintf(&b, "\r\n\r\n--%s\r\nContent-Type: %s; charset=UTF-8;\nContent-Transfer-Encoding: 8bit\r\n\r\n", writer.Boundary(), "text/html")
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b.Write([]byte(htmlMessage))
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_, _ = fmt.Fprintf(&b, "\r\n\r\n--%s--\r\n", writer.Boundary())
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sender := s.Config.SMTPSender
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if strings.Contains(sender, "<") {
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sender = text.BetweenStrings(sender, "<", ">")
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}
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// Sending email.
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err := smtp.SendMail(fmt.Sprintf("%s:%s", s.Config.SMTPHost, s.Config.SMTPPort), auth, sender, []string{to}, b.Bytes())
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if err != nil {
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log.Println(err)
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return
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}
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log.Println(fmt.Sprintf("Email sent to %s", to))
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}
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