Pierre-Olivier Mercier
c0a3ea2d4c
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159 lines
4.5 KiB
Go
159 lines
4.5 KiB
Go
// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydomain.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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package utils
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import (
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"bytes"
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"flag"
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"io"
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"net/mail"
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"text/template"
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"git.happydns.org/happydomain/ui"
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gomail "github.com/go-mail/mail"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer/html"
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)
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// mailAddress defines an interface that handle mail.Address configuration
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// throught custom flag.
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type mailAddress struct {
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*mail.Address
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}
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func (i *mailAddress) String() string {
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if i.Address == nil {
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return ""
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}
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return i.Address.String()
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}
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func (i *mailAddress) Set(value string) error {
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v, err := mail.ParseAddress(value)
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if err != nil {
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return err
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}
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*i.Address = *v
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return nil
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}
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type sendMethod interface {
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PrepareAndSend(...*gomail.Message) error
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}
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var (
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// MailFrom holds the content of the From field for all e-mails that
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// will be send.
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MailFrom = mail.Address{Name: "happyDomain", Address: "happydomain@localhost"}
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// SendMethod is a pointer to the current global method used to send
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// e-mails.
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SendMethod sendMethod = &SystemSendmail{}
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)
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func init() {
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flag.Var(&mailAddress{&MailFrom}, "mail-from", "Define the sender name and address for all e-mail sent")
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}
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// SendMail takes a content writen in Markdown to send it to the given user. It
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// uses Markdown to create a HTML version of the message and leave the Markdown
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// format in the text version. To perform sending, it relies on the SendMethod
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// global variable.
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func SendMail(to *mail.Address, subject, content string) (err error) {
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m := gomail.NewMessage()
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m.SetHeader("From", MailFrom.String())
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m.SetHeader("To", to.String())
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m.SetHeader("Subject", subject)
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toName := to.Name
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if len(toName) == 0 {
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toName = to.Address
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}
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tplData := map[string]string{
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"Lang": "en",
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"To": toName,
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"ToAddress": to.Address,
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"Subject": subject,
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"From": MailFrom.Name,
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"FromAddress": MailFrom.Address,
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"Content": content,
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}
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if t, err := template.New("mailText").Parse(mailTXTTpl); err != nil {
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return err
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} else {
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m.SetBodyWriter("text/plain", func(w io.Writer) error {
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return t.Execute(w, tplData)
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})
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}
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// Convert text from Markdown to HTML
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md := goldmark.New(
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goldmark.WithExtensions(extension.GFM),
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goldmark.WithParserOptions(
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parser.WithAutoHeadingID(),
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),
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goldmark.WithRendererOptions(
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html.WithHardWraps(),
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html.WithXHTML(),
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),
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)
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var buf bytes.Buffer
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if err = md.Convert([]byte(content), &buf); err != nil {
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return
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}
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if data, err := ui.GetEmbedFS().Open("dist/img/happydomain.png"); err == nil {
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m.EmbedReader("happydomain.png", data)
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}
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if t, err := template.New("mailHTML").Parse(mailHTMLTpl); err != nil {
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return err
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} else {
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m.AddAlternativeWriter("text/html", func(w io.Writer) error {
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tplData["Content"] = buf.String()
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return t.Execute(w, tplData)
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})
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}
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if err = SendMethod.PrepareAndSend(m); err != nil {
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return
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}
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return
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}
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