1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

//go:generate go run invisible/generate.go -v -o ./invisible_gen.go

//go:generate go run ambiguous/generate.go -v -o ./ambiguous_gen.go ambiguous/ambiguous.json

package charset

import (
	"bufio"
	"io"
	"strings"

	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/translation"
)

// RuneNBSP is the codepoint for NBSP
const RuneNBSP = 0xa0

// EscapeControlHTML escapes the unicode control sequences in a provided html document
func EscapeControlHTML(text string, locale translation.Locale, allowed ...rune) (escaped *EscapeStatus, output string) {
	sb := &strings.Builder{}
	outputStream := &HTMLStreamerWriter{Writer: sb}
	streamer := NewEscapeStreamer(locale, outputStream, allowed...).(*escapeStreamer)

	if err := StreamHTML(strings.NewReader(text), streamer); err != nil {
		streamer.escaped.HasError = true
		log.Error("Error whilst escaping: %v", err)
	}
	return streamer.escaped, sb.String()
}

// EscapeControlReaders escapes the unicode control sequences in a provided reader of HTML content and writer in a locale and returns the findings as an EscapeStatus and the escaped []byte
func EscapeControlReader(reader io.Reader, writer io.Writer, locale translation.Locale, allowed ...rune) (escaped *EscapeStatus, err error) {
	outputStream := &HTMLStreamerWriter{Writer: writer}
	streamer := NewEscapeStreamer(locale, outputStream, allowed...).(*escapeStreamer)

	if err = StreamHTML(reader, streamer); err != nil {
		streamer.escaped.HasError = true
		log.Error("Error whilst escaping: %v", err)
	}
	return streamer.escaped, err
}

// EscapeControlStringReader escapes the unicode control sequences in a provided reader of string content and writer in a locale and returns the findings as an EscapeStatus and the escaped []byte. HTML line breaks are not inserted after every newline by this method.
func EscapeControlStringReader(reader io.Reader, writer io.Writer, locale translation.Locale, allowed ...rune) (escaped *EscapeStatus, err error) {
	bufRd := bufio.NewReader(reader)
	outputStream := &HTMLStreamerWriter{Writer: writer}
	streamer := NewEscapeStreamer(locale, outputStream, allowed...).(*escapeStreamer)

	for {
		line, rdErr := bufRd.ReadString('\n')
		if len(line) > 0 {
			if err := streamer.Text(line); err != nil {
				streamer.escaped.HasError = true
				log.Error("Error whilst escaping: %v", err)
				return streamer.escaped, err
			}
		}
		if rdErr != nil {
			if rdErr != io.EOF {
				err = rdErr
			}
			break
		}
	}
	return streamer.escaped, err
}

// EscapeControlString escapes the unicode control sequences in a provided string and returns the findings as an EscapeStatus and the escaped string
func EscapeControlString(text string, locale translation.Locale, allowed ...rune) (escaped *EscapeStatus, output string) {
	sb := &strings.Builder{}
	outputStream := &HTMLStreamerWriter{Writer: sb}
	streamer := NewEscapeStreamer(locale, outputStream, allowed...).(*escapeStreamer)

	if err := streamer.Text(text); err != nil {
		streamer.escaped.HasError = true
		log.Error("Error whilst escaping: %v", err)
	}
	return streamer.escaped, sb.String()
}