simplemail/simplemail.go

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2024-02-20 23:51:48 +00:00
package simplemail
import (
"bytes"
"errors"
"github.com/1f349/overlapfs"
"github.com/emersion/go-message/mail"
htmlTemplate "html/template"
"io"
"io/fs"
"log"
"os"
"path/filepath"
textTemplate "text/template"
)
type SimpleMail struct {
mailSender *Mail
htmlTemplates *htmlTemplate.Template
textTemplates *textTemplate.Template
}
func New(sender *Mail, wd string, normal fs.FS) (simpleMail *SimpleMail, err error) {
m := &SimpleMail{mailSender: sender}
if wd != "" {
mailDir := filepath.Join(wd, "mail-templates")
err = os.Mkdir(mailDir, os.ModePerm)
if err != nil && !errors.Is(err, os.ErrExist) {
return
}
wdFs := os.DirFS(mailDir)
normal = overlapfs.OverlapFS{A: normal, B: wdFs}
}
m.htmlTemplates, err = htmlTemplate.New("mail").ParseFS(normal, "*.go.html")
if err != nil {
return
}
m.textTemplates, err = textTemplate.New("mail").ParseFS(normal, "*.go.txt")
if err != nil {
return
}
return m, nil
}
func (m *SimpleMail) render(wrHtml, wrTxt io.Writer, name string, data any) {
err := m.htmlTemplates.ExecuteTemplate(wrHtml, name+".go.html", data)
if err != nil {
log.Printf("Failed to render mail html: %s: %s\n", name, err)
}
err = m.textTemplates.ExecuteTemplate(wrTxt, name+".go.txt", data)
if err != nil {
log.Printf("Failed to render mail text: %s: %s\n", name, err)
}
}
func (m *SimpleMail) Send(templateName, subject string, to *mail.Address, data map[string]any) error {
var bufHtml, bufTxt bytes.Buffer
m.render(&bufHtml, &bufTxt, templateName, data)
return m.mailSender.SendMail(subject, []*mail.Address{to}, &bufHtml, &bufTxt)
}