go-mail/b64linebreaker_test.go

// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
//
// SPDX-License-Identifier: MIT

package mail

import (
	"bufio"
	"bytes"
	"encoding/base64"
	"errors"
	"fmt"
	"io"
	"os"
	"testing"
)

const logoB64 = `PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+PCFE
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`

var (
	errMockDefault = errors.New("mock write error")
	errMockNewline = errors.New("mock newline error")
)

// TestBase64LineBreaker tests the Write and Close methods of the Base64LineBreaker
func TestBase64LineBreaker(t *testing.T) {
	l, err := os.Open("assets/gopher2.svg")
	if err != nil {
		t.Errorf("failed to open gopher logo asset: %s", err)
		return
	}
	defer func() { _ = l.Close() }()

	var wbuf bytes.Buffer
	lb := Base64LineBreaker{out: &wbuf}
	bw := base64.NewEncoder(base64.StdEncoding, &lb)
	if _, err := io.Copy(bw, l); err != nil {
		t.Errorf("failed to write logo asset to line breaker: %s", err)
		return
	}
	if err := bw.Close(); err != nil {
		t.Errorf("failed to close b64 encoder: %s", err)
	}
	if err := lb.Close(); err != nil {
		t.Errorf("failed to close line breaker: %s", err)
	}
	ob := removeNewLines([]byte(logoB64))
	nb := removeNewLines(wbuf.Bytes())
	if string(ob) != string(nb) {
		t.Errorf("generated line breaker output differs from original data")
	}
}

// TestBase64LineBreakerFailures tests the cases in which the Base64LineBreaker would fail
func TestBase64LineBreakerFailures(t *testing.T) {
	stt := []byte("short")
	ltt := []byte(logoB64)

	// No output writer defined
	lb := Base64LineBreaker{}
	if _, err := lb.Write(stt); err == nil {
		t.Errorf("writing to Base64LineBreaker with no output io.Writer was supposed to failed, but didn't")
	}
	if err := lb.Close(); err != nil {
		t.Errorf("failed to close Base64LineBreaker: %s", err)
	}

	// Closed output writer
	wbuf := errorWriter{}
	fb := Base64LineBreaker{out: wbuf}
	if _, err := fb.Write(ltt); err == nil {
		t.Errorf("writing to Base64LineBreaker with errorWriter was supposed to failed, but didn't")
	}
	if err := fb.Close(); err != nil {
		t.Errorf("failed to close Base64LineBreaker: %s", err)
	}
}

func TestBase64LineBreaker_WriteAndClose(t *testing.T) {
	tests := []struct {
		name   string
		data   []byte
		writer io.Writer
	}{
		{
			name:   "Write data within MaxBodyLength",
			data:   []byte("testdata"),
			writer: &mockWriterExcess{writeError: errMockDefault},
		},
		{
			name: "Write data exceeds MaxBodyLength",
			data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
				"verylongtestdataverylongtestdataverylongtestdata"),
			writer: &mockWriterExcess{writeError: errMockDefault},
		},
		{
			name: "Write data exceeds MaxBodyLength with newline",
			data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
				"verylongtestdataverylongtestdataverylongtestdata"),
			writer: &mockWriterNewline{writeError: errMockDefault},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			blr := &Base64LineBreaker{out: tt.writer}

			_, err := blr.Write(tt.data)
			if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
				t.Errorf("Unexpected error while writing: %v", err)
			}
			err = blr.Close()
			if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
				t.Errorf("Unexpected error while closing: %v", err)
			}
		})
	}
}

// removeNewLines removes any newline characters from the given data
func removeNewLines(data []byte) []byte {
	result := make([]byte, len(data))
	n := 0

	for _, b := range data {
		if b == '\r' || b == '\n' {
			continue
		}
		result[n] = b
		n++
	}

	return result[0:n]
}

type errorWriter struct{}

func (e errorWriter) Write([]byte) (int, error) {
	return 0, fmt.Errorf("supposed to always fail")
}

func (e errorWriter) Close() error {
	return fmt.Errorf("supposed to always fail")
}

type mockWriterExcess struct {
	writeError error
}
type mockWriterNewline struct {
	writeError error
}

func (w *mockWriterExcess) Write(p []byte) (n int, err error) {
	switch len(p) {
	case 0:
		return 0, nil
	case 2:
		return 2, nil
	default:
		return len(p), errMockDefault
	}
}

func (w *mockWriterNewline) Write(p []byte) (n int, err error) {
	switch len(p) {
	case 0:
		return 0, nil
	case 2:
		return 2, errMockNewline
	default:
		return len(p), nil
	}
}

func FuzzBase64LineBreaker_Write(f *testing.F) {
	f.Add([]byte("abc"))
	f.Add([]byte("def"))
	f.Add([]uint8{0o0, 0o1, 0o2, 30, 255})
	buf := bytes.Buffer{}
	bw := bufio.NewWriter(&buf)
	f.Fuzz(func(t *testing.T, data []byte) {
		b := &Base64LineBreaker{out: bw}
		if _, err := b.Write(data); err != nil {
			t.Errorf("failed to write to B64LineBreaker: %s", err)
		}
		if err := b.Close(); err != nil {
			t.Errorf("failed to close B64LineBreaker: %s", err)
		}
	})
}