gotosocial/internal/email/util.go

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/*
GoToSocial
2021-12-20 17:42:19 +00:00
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package email
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"text/template"
)
func loadTemplates(templateBaseDir string) (*template.Template, error) {
cwd, err := os.Getwd()
if err != nil {
return nil, fmt.Errorf("error getting current working directory: %s", err)
}
// look for all templates that start with 'email_'
tmPath := filepath.Join(cwd, fmt.Sprintf("%semail_*", templateBaseDir))
return template.ParseGlob(tmPath)
}
// https://datatracker.ietf.org/doc/html/rfc2822
// I did not read the RFC, I just copy and pasted from
// https://pkg.go.dev/net/smtp#SendMail
// and it did seem to work.
func assembleMessage(mailSubject string, mailBody string, mailTo string, mailFrom string) ([]byte, error) {
if strings.Contains(mailSubject, "\r") || strings.Contains(mailSubject, "\n") {
return nil, errors.New("email subject must not contain newline characters")
}
if strings.Contains(mailFrom, "\r") || strings.Contains(mailFrom, "\n") {
return nil, errors.New("email from address must not contain newline characters")
}
if strings.Contains(mailTo, "\r") || strings.Contains(mailTo, "\n") {
return nil, errors.New("email to address must not contain newline characters")
}
// normalize the message body to use CRLF line endings
mailBody = strings.ReplaceAll(mailBody, "\r\n", "\n")
mailBody = strings.ReplaceAll(mailBody, "\n", "\r\n")
msg := []byte(
"To: " + mailTo + "\r\n" +
"Subject: " + mailSubject + "\r\n" +
"\r\n" +
mailBody + "\r\n",
)
return msg, nil
}