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Code Issues Projects Releases Wiki Activity

Support for base64 encoded emails

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binwiederhier 2023-02-19 09:39:04 -05:00
parent 1edcc239e5
commit e9b05e8ed7
3 changed files with 113 additions and 19 deletions
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4
docs/releases.md
View file

@ -4,6 +4,10 @@ and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/release
## ntfy server v2.0.2 (UNRELEASED)
**Bug fixes + maintenance:**
* Support for base64 encoded emails ([#610](https://github.com/binwiederhier/ntfy/issues/610), thanks to [@Robert-litts](https://github.com/Robert-litts))
**Additional languages:**
* Arabic (thanks to [@ButterflyOfFire](https://hosted.weblate.org/user/ButterflyOfFire/))

37
server/smtp_server.go
View file

@ -2,6 +2,7 @@ package server
import (
"bytes"
"encoding/base64"
"errors"
"fmt"
"github.com/emersion/go-smtp"
@ -204,28 +205,20 @@ func (s *smtpSession) withFailCount(fn func() error) error {
func readMailBody(msg *mail.Message) (string, error) {
if msg.Header.Get("Content-Type") == "" {
return readPlainTextMailBody(msg)
return readPlainTextMailBody(msg.Body, msg.Header.Get("Content-Transfer-Encoding"))
}
contentType, params, err := mime.ParseMediaType(msg.Header.Get("Content-Type"))
if err != nil {
return "", err
}
if contentType == "text/plain" {
return readPlainTextMailBody(msg)
} else if strings.HasPrefix(contentType, "multipart/") {
if strings.ToLower(contentType) == "text/plain" {
return readPlainTextMailBody(msg.Body, msg.Header.Get("Content-Transfer-Encoding"))
} else if strings.HasPrefix(strings.ToLower(contentType), "multipart/") {
return readMultipartMailBody(msg, params)
}
return "", errUnsupportedContentType
}
func readPlainTextMailBody(msg *mail.Message) (string, error) {
body, err := io.ReadAll(msg.Body)
if err != nil {
return "", err
}
return string(body), nil
}
func readMultipartMailBody(msg *mail.Message, params map[string]string) (string, error) {
mr := multipart.NewReader(msg.Body, params["boundary"])
for {
@ -236,14 +229,20 @@ func readMultipartMailBody(msg *mail.Message, params map[string]string) (string,
partContentType, _, err := mime.ParseMediaType(part.Header.Get("Content-Type"))
if err != nil {
return "", err
}
if partContentType != "text/plain" {
} else if strings.ToLower(partContentType) != "text/plain" {
continue
}
body, err := io.ReadAll(part)
if err != nil {
return "", err
}
return string(body), nil
return readPlainTextMailBody(part, part.Header.Get("Content-Transfer-Encoding"))
}
}
func readPlainTextMailBody(reader io.Reader, transferEncoding string) (string, error) {
if strings.ToLower(transferEncoding) == "base64" {
reader = base64.NewDecoder(base64.StdEncoding, reader)
}
body, err := io.ReadAll(reader)
if err != nil {
return "", err
}
return string(body), nil
}

91
server/smtp_server_test.go
View file

@ -348,6 +348,97 @@ what's up
writeAndReadUntilLine(t, email, c, scanner, "451 4.0.0 invalid address")
}
func TestSmtpBackend_Base64Body(t *testing.T) {
email := `EHLO example.com
MAIL FROM: test@mydomain.me
RCPT TO: ntfy-mytopic@ntfy.sh
DATA
Content-Type: multipart/mixed; boundary="===============2138658284696597373=="
MIME-Version: 1.0
Subject: TrueNAS truenas.local: TrueNAS Test Message hostname: truenas.local
From: =?utf-8?q?Robbie?= <test@mydomain.me>
To: test@mydomain.me
Date: Thu, 16 Feb 2023 01:04:00 -0000
Message-ID: <truenas-20230216.010400.344514.b'8jfL'@truenas.local>
This is a multi-part message in MIME format.
--===============2138658284696597373==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
VGhpcyBpcyBhIHRlc3QgbWVzc2FnZSBmcm9tIFRydWVOQVMgQ09SRS4=
--===============2138658284696597373==
Content-Type: text/html; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
L0VOIj4KClRoaXMgaXMgYSB0ZXN0IG1lc3NhZ2UgZnJvbSBUcnVlTkFTIENPUkUuCg==
--===============2138658284696597373==--
.
`
s, c, _, scanner := newTestSMTPServer(t, func(w http.ResponseWriter, r *http.Request) {
require.Equal(t, "/mytopic", r.URL.Path)
require.Equal(t, "TrueNAS truenas.local: TrueNAS Test Message hostname: truenas.local", r.Header.Get("Title"))
require.Equal(t, "This is a test message from TrueNAS CORE.", readAll(t, r.Body))
})
defer s.Close()
defer c.Close()
writeAndReadUntilLine(t, email, c, scanner, "250 2.0.0 OK: queued")
}
/*
func TestSmtpBackend_NestedMultipartBase64(t *testing.T) {
email := `EHLO example.com
MAIL FROM: test@mydomain.me
RCPT TO: ntfy-mytopic@ntfy.sh
DATA
Content-Type: multipart/mixed; boundary="===============2138658284696597373=="
MIME-Version: 1.0
Subject: TrueNAS truenas.local: TrueNAS Test Message hostname: truenas.local
From: =?utf-8?q?Robbie?= <test@mydomain.me>
To: test@mydomain.me
Date: Thu, 16 Feb 2023 01:04:00 -0000
Message-ID: <truenas-20230216.010400.344514.b'8jfL'@truenas.local>
This is a multi-part message in MIME format.
--===============2138658284696597373==
Content-Type: multipart/alternative; boundary="===============2233989480071754745=="
MIME-Version: 1.0
--===============2233989480071754745==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
VGhpcyBpcyBhIHRlc3QgbWVzc2FnZSBmcm9tIFRydWVOQVMgQ09SRS4=
--===============2233989480071754745==
Content-Type: text/html; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
L0VOIj4KClRoaXMgaXMgYSB0ZXN0IG1lc3NhZ2UgZnJvbSBUcnVlTkFTIENPUkUuCg==
--===============2233989480071754745==--
--===============2138658284696597373==--
.
`
s, c, _, scanner := newTestSMTPServer(t, func(w http.ResponseWriter, r *http.Request) {
t.Fatal("This should not be called")
})
defer s.Close()
defer c.Close()
writeAndReadUntilLine(t, email, c, scanner, "451 4.0.0 invalid address")
}
*/
type smtpHandlerFunc func(http.ResponseWriter, *http.Request)
func newTestSMTPServer(t *testing.T, handler smtpHandlerFunc) (s *smtp.Server, c net.Conn, conf *Config, scanner *bufio.Scanner) {