go-mail/msgwriter_test.go

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// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
//
// SPDX-License-Identifier: MIT
package mail
import (
"bytes"
"fmt"
"io"
"mime"
"strings"
"testing"
"time"
)
// brokenWriter implements a broken writer for io.Writer testing
type brokenWriter struct {
io.Writer
}
// Write implements the io.Writer interface but intentionally returns an error at
// any time
func (bw *brokenWriter) Write([]byte) (int, error) {
return 0, fmt.Errorf("intentionally failed")
}
// TestMsgWriter_Write tests the WriteTo() method of the msgWriter
func TestMsgWriter_Write(t *testing.T) {
bw := &brokenWriter{}
mw := &msgWriter{writer: bw, charset: CharsetUTF8, encoder: mime.QEncoding}
_, err := mw.Write([]byte("test"))
if err == nil {
t.Errorf("msgWriter WriteTo() with brokenWriter should fail, but didn't")
}
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// Also test the part when a previous error happened
mw.err = fmt.Errorf("broken")
_, err = mw.Write([]byte("test"))
if err == nil {
t.Errorf("msgWriter WriteTo() with brokenWriter should fail, but didn't")
}
}
// TestMsgWriter_writeMsg tests the writeMsg method of the msgWriter
func TestMsgWriter_writeMsg(t *testing.T) {
m := NewMsg()
_ = m.From(`"Toni Tester" <test@example.com>`)
_ = m.To(`"Toni Receiver" <receiver@example.com>`)
m.Subject("This is a subject")
m.SetBulk()
now := time.Now()
m.SetDateWithValue(now)
m.SetMessageIDWithValue("message@id.com")
m.SetBodyString(TypeTextPlain, "This is the body")
m.AddAlternativeString(TypeTextHTML, "This is the alternative body")
buf := bytes.Buffer{}
mw := &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
mw.writeMsg(m)
ms := buf.String()
var ea []string
if !strings.Contains(ms, `MIME-Version: 1.0`) {
ea = append(ea, "MIME-Version")
}
if !strings.Contains(ms, fmt.Sprintf("Date: %s", now.Format(time.RFC1123Z))) {
ea = append(ea, "Date")
}
if !strings.Contains(ms, `Message-ID: <message@id.com>`) {
ea = append(ea, "Message-ID")
}
if !strings.Contains(ms, `Precedence: bulk`) {
ea = append(ea, "Precedence")
}
if !strings.Contains(ms, `Subject: This is a subject`) {
ea = append(ea, "Subject")
}
if !strings.Contains(ms, `User-Agent: go-mail v`) {
ea = append(ea, "User-Agent")
}
if !strings.Contains(ms, `X-Mailer: go-mail v`) {
ea = append(ea, "X-Mailer")
}
if !strings.Contains(ms, `From: "Toni Tester" <test@example.com>`) {
ea = append(ea, "From")
}
if !strings.Contains(ms, `To: "Toni Receiver" <receiver@example.com>`) {
ea = append(ea, "To")
}
if !strings.Contains(ms, `Content-Type: text/plain; charset=UTF-8`) {
ea = append(ea, "Content-Type")
}
if !strings.Contains(ms, `Content-Transfer-Encoding: quoted-printable`) {
ea = append(ea, "Content-Transfer-Encoding")
}
if !strings.Contains(ms, "\r\n\r\nThis is the body") {
ea = append(ea, "Message body")
}
pl := m.GetParts()
if len(pl) <= 0 {
t.Errorf("expected multiple parts but got none")
return
}
if len(pl) == 2 {
ap := pl[1]
ap.SetCharset(CharsetISO88591)
}
buf.Reset()
mw.writeMsg(m)
ms = buf.String()
if !strings.Contains(ms, "\r\n\r\nThis is the alternative body") {
ea = append(ea, "Message alternative body")
}
if !strings.Contains(ms, `Content-Type: text/html; charset=ISO-8859-1`) {
ea = append(ea, "alternative body charset")
}
if len(ea) > 0 {
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em := "writeMsg() failed. The following errors occurred:\n"
for e := range ea {
em += fmt.Sprintf("* incorrect %q field", ea[e])
}
em += fmt.Sprintf("\n\nFull message:\n%s", ms)
t.Error(em)
}
}
// TestMsgWriter_writeMsg_PGP tests the writeMsg method of the msgWriter with PGP types set
func TestMsgWriter_writeMsg_PGP(t *testing.T) {
m := NewMsg(WithPGPType(PGPEncrypt))
_ = m.From(`"Toni Tester" <test@example.com>`)
_ = m.To(`"Toni Receiver" <receiver@example.com>`)
m.Subject("This is a subject")
m.SetBodyString(TypeTextPlain, "This is the body")
buf := bytes.Buffer{}
mw := &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
mw.writeMsg(m)
ms := buf.String()
if !strings.Contains(ms, `encrypted; protocol="application/pgp-encrypted"`) {
t.Errorf("writeMsg failed. Expected PGP encoding header but didn't find it in message output")
}
m = NewMsg(WithPGPType(PGPSignature))
_ = m.From(`"Toni Tester" <test@example.com>`)
_ = m.To(`"Toni Receiver" <receiver@example.com>`)
m.Subject("This is a subject")
m.SetBodyString(TypeTextPlain, "This is the body")
buf = bytes.Buffer{}
mw = &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
mw.writeMsg(m)
ms = buf.String()
if !strings.Contains(ms, `signed; protocol="application/pgp-signature"`) {
t.Errorf("writeMsg failed. Expected PGP encoding header but didn't find it in message output")
}
}