mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-09-20 14:22:02 +00:00
c2738474d5
* [bugfix] add Date and Message-ID headers for email This should make spam filters more happy, as most of them grant some negative score for not having those headers. Also the Date is convenient for the user receiving the mail. * make golangci-lint happy
120 lines
4 KiB
Go
120 lines
4 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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