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
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142

// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package markup

import (
	"bufio"
	"bytes"
	"html"
	"io"
	"regexp"
	"strconv"

	"code.gitea.io/gitea/modules/csv"
	"code.gitea.io/gitea/modules/markup"
	"code.gitea.io/gitea/modules/setting"
)

func init() {
	markup.RegisterRenderer(Renderer{})
}

// Renderer implements markup.Renderer for csv files
type Renderer struct{}

// Name implements markup.Renderer
func (Renderer) Name() string {
	return "csv"
}

// Extensions implements markup.Renderer
func (Renderer) Extensions() []string {
	return []string{".csv", ".tsv"}
}

// SanitizerRules implements markup.Renderer
func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
	return []setting.MarkupSanitizerRule{
		{Element: "table", AllowAttr: "class", Regexp: regexp.MustCompile(`data-table`)},
		{Element: "th", AllowAttr: "class", Regexp: regexp.MustCompile(`line-num`)},
		{Element: "td", AllowAttr: "class", Regexp: regexp.MustCompile(`line-num`)},
	}
}

func writeField(w io.Writer, element, class, field string) error {
	if _, err := io.WriteString(w, "<"); err != nil {
		return err
	}
	if _, err := io.WriteString(w, element); err != nil {
		return err
	}
	if len(class) > 0 {
		if _, err := io.WriteString(w, " class=\""); err != nil {
			return err
		}
		if _, err := io.WriteString(w, class); err != nil {
			return err
		}
		if _, err := io.WriteString(w, "\""); err != nil {
			return err
		}
	}
	if _, err := io.WriteString(w, ">"); err != nil {
		return err
	}
	if _, err := io.WriteString(w, html.EscapeString(field)); err != nil {
		return err
	}
	if _, err := io.WriteString(w, "</"); err != nil {
		return err
	}
	if _, err := io.WriteString(w, element); err != nil {
		return err
	}
	_, err := io.WriteString(w, ">")
	return err
}

// Render implements markup.Renderer
func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
	tmpBlock := bufio.NewWriter(output)

	// FIXME: don't read all to memory
	rawBytes, err := io.ReadAll(input)
	if err != nil {
		return err
	}

	if setting.UI.CSV.MaxFileSize != 0 && setting.UI.CSV.MaxFileSize < int64(len(rawBytes)) {
		if _, err := tmpBlock.WriteString("<pre>"); err != nil {
			return err
		}
		if _, err := tmpBlock.WriteString(html.EscapeString(string(rawBytes))); err != nil {
			return err
		}
		_, err = tmpBlock.WriteString("</pre>")
		return err
	}

	rd, err := csv.CreateReaderAndDetermineDelimiter(ctx, bytes.NewReader(rawBytes))
	if err != nil {
		return err
	}

	if _, err := tmpBlock.WriteString(`<table class="data-table">`); err != nil {
		return err
	}
	row := 1
	for {
		fields, err := rd.Read()
		if err == io.EOF {
			break
		}
		if err != nil {
			continue
		}
		if _, err := tmpBlock.WriteString("<tr>"); err != nil {
			return err
		}
		element := "td"
		if row == 1 {
			element = "th"
		}
		if err := writeField(tmpBlock, element, "line-num", strconv.Itoa(row)); err != nil {
			return err
		}
		for _, field := range fields {
			if err := writeField(tmpBlock, element, "", field); err != nil {
				return err
			}
		}
		if _, err := tmpBlock.WriteString("</tr>"); err != nil {
			return err
		}

		row++
	}
	if _, err = tmpBlock.WriteString("</table>"); err != nil {
		return err
	}
	return tmpBlock.Flush()
}