121 lines
4.0 KiB
Go
121 lines
4.0 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package email
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import (
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"bytes"
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"errors"
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"fmt"
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"net/smtp"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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"time"
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"github.com/google/uuid"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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)
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func (s *sender) sendTemplate(template string, subject string, data any, toAddresses ...string) error {
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buf := &bytes.Buffer{}
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if err := s.template.ExecuteTemplate(buf, template, data); err != nil {
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return err
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}
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msg, err := assembleMessage(subject, buf.String(), s.from, s.msgIDHost, toAddresses...)
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if err != nil {
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return err
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}
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if err := smtp.SendMail(s.hostAddress, s.auth, s.from, toAddresses, msg); err != nil {
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return gtserror.SetSMTP(err)
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}
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return nil
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}
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func loadTemplates(templateBaseDir string) (*template.Template, error) {
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if !filepath.IsAbs(templateBaseDir) {
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cwd, err := os.Getwd()
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if err != nil {
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return nil, fmt.Errorf("error getting current working directory: %s", err)
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}
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templateBaseDir = filepath.Join(cwd, templateBaseDir)
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}
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// look for all templates that start with 'email_'
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return template.ParseGlob(filepath.Join(templateBaseDir, "email_*"))
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}
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// assembleMessage assembles a valid email message following:
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// - https://datatracker.ietf.org/doc/html/rfc2822
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// - https://pkg.go.dev/net/smtp#SendMail
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func assembleMessage(mailSubject string, mailBody string, mailFrom string, msgIDHost string, mailTo ...string) ([]byte, error) {
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if strings.ContainsAny(mailSubject, "\r\n") {
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return nil, errors.New("email subject must not contain newline characters")
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}
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if strings.ContainsAny(mailFrom, "\r\n") {
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return nil, errors.New("email from address must not contain newline characters")
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}
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for _, to := range mailTo {
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if strings.ContainsAny(to, "\r\n") {
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return nil, errors.New("email to address must not contain newline characters")
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}
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}
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// Normalize the message body to use CRLF line endings
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const CRLF = "\r\n"
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mailBody = strings.ReplaceAll(mailBody, CRLF, "\n")
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mailBody = strings.ReplaceAll(mailBody, "\n", CRLF)
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msg := bytes.Buffer{}
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switch {
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case len(mailTo) == 1:
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// Address email directly to the one recipient.
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msg.WriteString("To: " + mailTo[0] + CRLF)
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case config.GetSMTPDiscloseRecipients():
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// Simply address To all recipients.
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msg.WriteString("To: " + strings.Join(mailTo, ", ") + CRLF)
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default:
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// Address To anonymous group.
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//
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// Email will be sent to all recipients but we shouldn't include Bcc header.
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//
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// From the smtp.SendMail function: 'Sending "Bcc" messages is accomplished by
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// including an email address in the to parameter but not including it in the
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// msg headers.'
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msg.WriteString("To: Undisclosed Recipients:;" + CRLF)
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}
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msg.WriteString("Date: " + time.Now().Format(time.RFC822Z) + CRLF)
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msg.WriteString("From: " + mailFrom + CRLF)
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msg.WriteString("Message-ID: <" + uuid.New().String() + "@" + msgIDHost + ">" + CRLF)
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msg.WriteString("Subject: " + mailSubject + CRLF)
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msg.WriteString("MIME-Version: 1.0" + CRLF)
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msg.WriteString("Content-Transfer-Encoding: 8bit" + CRLF)
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msg.WriteString("Content-Type: text/plain; charset=\"UTF-8\"" + CRLF)
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msg.WriteString(CRLF)
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msg.WriteString(mailBody)
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msg.WriteString(CRLF)
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return msg.Bytes(), nil
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}
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