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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package quotedprintable
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"os/exec"
"regexp"
"sort"
"strings"
"testing"
"time"
)
func TestReader(t *testing.T) {
tests := []struct {
in, want string
err any
}{
{in: "", want: ""},
{in: "foo bar", want: "foo bar"},
{in: "foo bar=3D", want: "foo bar="},
{in: "foo bar=3d", want: "foo bar="}, // lax.
{in: "foo bar=\n", want: "foo bar"},
{in: "foo bar\n", want: "foo bar\n"}, // somewhat lax.
{in: "foo bar=0", want: "foo bar=0"}, // lax
{in: "foo bar=0D=0A", want: "foo bar\r\n"},
{in: " A B \r\n C ", want: " A B\r\n C"},
{in: " A B =\r\n C ", want: " A B C"},
{in: " A B =\n C ", want: " A B C"}, // lax. treating LF as CRLF
{in: "foo=\nbar", want: "foobar"},
{in: "foo\x00bar", want: "foo", err: "quotedprintable: invalid unescaped byte 0x00 in body"},
{in: "foo bar\xff", want: "foo bar\xff"},
// Equal sign.
{in: "=3D30\n", want: "=30\n"},
{in: "=00=FF0=\n", want: "\x00\xff0"},
// Trailing whitespace
{in: "foo \n", want: "foo\n"},
{in: "foo \n\nfoo =\n\nfoo=20\n\n", want: "foo\n\nfoo \nfoo \n\n"},
// Tests that we allow bare \n and \r through, despite it being strictly
// not permitted per RFC 2045, Section 6.7 Page 22 bullet (4).
{in: "foo\nbar", want: "foo\nbar"},
{in: "foo\rbar", want: "foo\rbar"},
{in: "foo\r\nbar", want: "foo\r\nbar"},
// Different types of soft line-breaks.
{in: "foo=\r\nbar", want: "foobar"},
{in: "foo=\nbar", want: "foobar"},
{in: "foo=\rbar", want: "foo", err: "quotedprintable: invalid hex byte 0x0d"},
{in: "foo=\r\r\r \nbar", want: "foo", err: `quotedprintable: invalid bytes after =: "\r\r\r \n"`},
// Issue 15486, accept trailing soft line-break at end of input.
{in: "foo=", want: "foo"},
{in: "=", want: "", err: `quotedprintable: invalid bytes after =: ""`},
// Example from RFC 2045:
{in: "Now's the time =\n" + "for all folk to come=\n" + " to the aid of their country.",
want: "Now's the time for all folk to come to the aid of their country."},
{in: "accept UTF-8 right quotation mark: ’",
want: "accept UTF-8 right quotation mark: ’"},
}
for _, tt := range tests {
var buf strings.Builder
_, err := io.Copy(&buf, NewReader(strings.NewReader(tt.in)))
if got := buf.String(); got != tt.want {
t.Errorf("for %q, got %q; want %q", tt.in, got, tt.want)
}
switch verr := tt.err.(type) {
case nil:
if err != nil {
t.Errorf("for %q, got unexpected error: %v", tt.in, err)
}
case string:
if got := fmt.Sprint(err); got != verr {
t.Errorf("for %q, got error %q; want %q", tt.in, got, verr)
}
case error:
if err != verr {
t.Errorf("for %q, got error %q; want %q", tt.in, err, verr)
}
}
}
}
func everySequence(base, alpha string, length int, fn func(string)) {
if len(base) == length {
fn(base)
return
}
for i := 0; i < len(alpha); i++ {
everySequence(base+alpha[i:i+1], alpha, length, fn)
}
}
var useQprint = flag.Bool("qprint", false, "Compare against the 'qprint' program.")
var badSoftRx = regexp.MustCompile(`=([^\r\n]+?\n)|([^\r\n]+$)|(\r$)|(\r[^\n]+\n)|( \r\n)`)
func TestExhaustive(t *testing.T) {
if *useQprint {
_, err := exec.LookPath("qprint")
if err != nil {
t.Fatalf("Error looking for qprint: %v", err)
}
}
var buf strings.Builder
res := make(map[string]int)
n := 6
if testing.Short() {
n = 4
}
everySequence("", "0A \r\n=", n, func(s string) {
if strings.HasSuffix(s, "=") || strings.Contains(s, "==") {
return
}
buf.Reset()
_, err := io.Copy(&buf, NewReader(strings.NewReader(s)))
if err != nil {
errStr := err.Error()
if strings.Contains(errStr, "invalid bytes after =:") {
errStr = "invalid bytes after ="
}
res[errStr]++
if strings.Contains(errStr, "invalid hex byte ") {
if strings.HasSuffix(errStr, "0x20") && (strings.Contains(s, "=0 ") || strings.Contains(s, "=A ") || strings.Contains(s, "= ")) {
return
}
if strings.HasSuffix(errStr, "0x3d") && (strings.Contains(s, "=0=") || strings.Contains(s, "=A=")) {
return
}
if strings.HasSuffix(errStr, "0x0a") || strings.HasSuffix(errStr, "0x0d") {
// bunch of cases; since whitespace at the end of a line before \n is removed.
return
}
}
if strings.Contains(errStr, "unexpected EOF") {
return
}
if errStr == "invalid bytes after =" && badSoftRx.MatchString(s) {
return
}
t.Errorf("decode(%q) = %v", s, err)
return
}
if *useQprint {
cmd := exec.Command("qprint", "-d")
cmd.Stdin = strings.NewReader(s)
stderr, err := cmd.StderrPipe()
if err != nil {
panic(err)
}
qpres := make(chan any, 2)
go func() {
br := bufio.NewReader(stderr)
s, _ := br.ReadString('\n')
if s != "" {
qpres <- errors.New(s)
if cmd.Process != nil {
// It can get stuck on invalid input, like:
// echo -n "0000= " | qprint -d
cmd.Process.Kill()
}
}
}()
go func() {
want, err := cmd.Output()
if err == nil {
qpres <- want
}
}()
select {
case got := <-qpres:
if want, ok := got.([]byte); ok {
if string(want) != buf.String() {
t.Errorf("go decode(%q) = %q; qprint = %q", s, want, buf.String())
}
} else {
t.Logf("qprint -d(%q) = %v", s, got)
}
case <-time.After(5 * time.Second):
t.Logf("qprint timeout on %q", s)
}
}
res["OK"]++
})
var outcomes []string
for k, v := range res {
outcomes = append(outcomes, fmt.Sprintf("%v: %d", k, v))
}
sort.Strings(outcomes)
got := strings.Join(outcomes, "\n")
want := `OK: 28934
invalid bytes after =: 3949
quotedprintable: invalid hex byte 0x0d: 2048
unexpected EOF: 194`
if testing.Short() {
want = `OK: 896
invalid bytes after =: 100
quotedprintable: invalid hex byte 0x0d: 26
unexpected EOF: 3`
}
if got != want {
t.Errorf("Got:\n%s\nWant:\n%s", got, want)
}
}
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