package quotedprintable import ( "bufio" "bytes" "errors" "flag" "fmt" "io" "os/exec" "regexp" "sort" "strings" "testing" "time" ) func TestReader(t *testing.T) { tests := []struct { in, want string err interface{} }{ {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", err: io.ErrUnexpectedEOF}, {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", err: "quotedprintable: invalid unescaped byte 0xff in body"}, // 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"`}, // 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."}, } for _, tt := range tests { var buf bytes.Buffer _, 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 bytes.Buffer res := make(map[string]int) everySequence("", "0A \r\n=", 6, 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 interface{}, 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: 21576 invalid bytes after =: 3397 quotedprintable: invalid hex byte 0x0a: 1400 quotedprintable: invalid hex byte 0x0d: 2700 quotedprintable: invalid hex byte 0x20: 2490 quotedprintable: invalid hex byte 0x3d: 440 unexpected EOF: 3122` if got != want { t.Errorf("Got:\n%s\nWant:\n%s", got, want) } }