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[bug] Send plaintext emails to fix "message refused: Message is not RFC 2822 compliant" (#366)

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* trying to fix "message refused: Message is not RFC 2822 compliant"

* fix "message refused: Message is not RFC 2822 compliant"

550 5.7.1 Delivery not authorized, message refused: Message is not RFC
2822 compliant

* remove silly regex

* lint

* fix tests

* we should use text/template instead of html/template now
This commit is contained in:
Forest Johnson
2022-01-31 10:46:20 +00:00
committed by GitHub
parent 959e38ac5c
commit 5be8a7a7ea
11 changed files with 78 additions and 28 deletions
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45
internal/email/util.go
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@@ -19,15 +19,12 @@
package email
import (
"errors"
"fmt"
"html/template"
"os"
"path/filepath"
)
const (
mime = `MIME-version: 1.0;
Content-Type: text/html;`
"strings"
"text/template"
)
func loadTemplates(templateBaseDir string) (*template.Template, error) {
@@ -41,16 +38,34 @@ func loadTemplates(templateBaseDir string) (*template.Template, error) {
return template.ParseGlob(tmPath)
}
func assembleMessage(mailSubject string, mailBody string, mailTo string, mailFrom string) []byte {
from := fmt.Sprintf("From: GoToSocial <%s>", mailFrom)
to := fmt.Sprintf("To: %s", mailTo)
// 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(
mailSubject + "\r\n" +
from + "\r\n" +
to + "\r\n" +
mime + "\r\n" +
mailBody + "\r\n")
"To: " + mailTo + "\r\n" +
"Subject: " + mailSubject + "\r\n" +
"\r\n" +
mailBody + "\r\n",
)
return msg
return msg, nil
}