forked from go-gitea/gitea
-
Notifications
You must be signed in to change notification settings - Fork 0
/
markup.go
190 lines (161 loc) · 5.73 KB
/
markup.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"regexp"
"strings"
"code.gitea.io/gitea/modules/log"
)
// ExternalMarkupRenderers represents the external markup renderers
var (
ExternalMarkupRenderers []*MarkupRenderer
ExternalSanitizerRules []MarkupSanitizerRule
MermaidMaxSourceCharacters int
)
const (
RenderContentModeSanitized = "sanitized"
RenderContentModeNoSanitizer = "no-sanitizer"
RenderContentModeIframe = "iframe"
)
// Markdown settings
var Markdown = struct {
EnableHardLineBreakInComments bool
EnableHardLineBreakInDocuments bool
CustomURLSchemes []string `ini:"CUSTOM_URL_SCHEMES"`
FileExtensions []string
EnableMath bool
}{
EnableHardLineBreakInComments: true,
EnableHardLineBreakInDocuments: false,
FileExtensions: strings.Split(".md,.markdown,.mdown,.mkd,.livemd", ","),
EnableMath: true,
}
// MarkupRenderer defines the external parser configured in ini
type MarkupRenderer struct {
Enabled bool
MarkupName string
Command string
FileExtensions []string
IsInputFile bool
NeedPostProcess bool
MarkupSanitizerRules []MarkupSanitizerRule
RenderContentMode string
}
// MarkupSanitizerRule defines the policy for whitelisting attributes on
// certain elements.
type MarkupSanitizerRule struct {
Element string
AllowAttr string
Regexp *regexp.Regexp
AllowDataURIImages bool
}
func loadMarkupFrom(rootCfg ConfigProvider) {
mustMapSetting(rootCfg, "markdown", &Markdown)
MermaidMaxSourceCharacters = rootCfg.Section("markup").Key("MERMAID_MAX_SOURCE_CHARACTERS").MustInt(5000)
ExternalMarkupRenderers = make([]*MarkupRenderer, 0, 10)
ExternalSanitizerRules = make([]MarkupSanitizerRule, 0, 10)
for _, sec := range rootCfg.Section("markup").ChildSections() {
name := strings.TrimPrefix(sec.Name(), "markup.")
if name == "" {
log.Warn("name is empty, markup " + sec.Name() + "ignored")
continue
}
if name == "sanitizer" || strings.HasPrefix(name, "sanitizer.") {
newMarkupSanitizer(name, sec)
} else {
newMarkupRenderer(name, sec)
}
}
}
func newMarkupSanitizer(name string, sec ConfigSection) {
rule, ok := createMarkupSanitizerRule(name, sec)
if ok {
if strings.HasPrefix(name, "sanitizer.") {
names := strings.SplitN(strings.TrimPrefix(name, "sanitizer."), ".", 2)
name = names[0]
}
for _, renderer := range ExternalMarkupRenderers {
if name == renderer.MarkupName {
renderer.MarkupSanitizerRules = append(renderer.MarkupSanitizerRules, rule)
return
}
}
ExternalSanitizerRules = append(ExternalSanitizerRules, rule)
}
}
func createMarkupSanitizerRule(name string, sec ConfigSection) (MarkupSanitizerRule, bool) {
var rule MarkupSanitizerRule
ok := false
if sec.HasKey("ALLOW_DATA_URI_IMAGES") {
rule.AllowDataURIImages = sec.Key("ALLOW_DATA_URI_IMAGES").MustBool(false)
ok = true
}
if sec.HasKey("ELEMENT") || sec.HasKey("ALLOW_ATTR") {
rule.Element = sec.Key("ELEMENT").Value()
rule.AllowAttr = sec.Key("ALLOW_ATTR").Value()
if rule.Element == "" || rule.AllowAttr == "" {
log.Error("Missing required values from markup.%s. Must have ELEMENT and ALLOW_ATTR defined!", name)
return rule, false
}
regexpStr := sec.Key("REGEXP").Value()
if regexpStr != "" {
// Validate when parsing the config that this is a valid regular
// expression. Then we can use regexp.MustCompile(...) later.
compiled, err := regexp.Compile(regexpStr)
if err != nil {
log.Error("In markup.%s: REGEXP (%s) failed to compile: %v", name, regexpStr, err)
return rule, false
}
rule.Regexp = compiled
}
ok = true
}
if !ok {
log.Error("Missing required keys from markup.%s. Must have ELEMENT and ALLOW_ATTR or ALLOW_DATA_URI_IMAGES defined!", name)
return rule, false
}
return rule, true
}
func newMarkupRenderer(name string, sec ConfigSection) {
extensionReg := regexp.MustCompile(`\.\w`)
extensions := sec.Key("FILE_EXTENSIONS").Strings(",")
exts := make([]string, 0, len(extensions))
for _, extension := range extensions {
if !extensionReg.MatchString(extension) {
log.Warn(sec.Name() + " file extension " + extension + " is invalid. Extension ignored")
} else {
exts = append(exts, extension)
}
}
if len(exts) == 0 {
log.Warn(sec.Name() + " file extension is empty, markup " + name + " ignored")
return
}
command := sec.Key("RENDER_COMMAND").MustString("")
if command == "" {
log.Warn(" RENDER_COMMAND is empty, markup " + name + " ignored")
return
}
if sec.HasKey("DISABLE_SANITIZER") {
log.Error("Deprecated setting `[markup.*]` `DISABLE_SANITIZER` present. This fallback will be removed in v1.18.0")
}
renderContentMode := sec.Key("RENDER_CONTENT_MODE").MustString(RenderContentModeSanitized)
if !sec.HasKey("RENDER_CONTENT_MODE") && sec.Key("DISABLE_SANITIZER").MustBool(false) {
renderContentMode = RenderContentModeNoSanitizer // if only the legacy DISABLE_SANITIZER exists, use it
}
if renderContentMode != RenderContentModeSanitized &&
renderContentMode != RenderContentModeNoSanitizer &&
renderContentMode != RenderContentModeIframe {
log.Error("invalid RENDER_CONTENT_MODE: %q, default to %q", renderContentMode, RenderContentModeSanitized)
renderContentMode = RenderContentModeSanitized
}
ExternalMarkupRenderers = append(ExternalMarkupRenderers, &MarkupRenderer{
Enabled: sec.Key("ENABLED").MustBool(false),
MarkupName: name,
FileExtensions: exts,
Command: command,
IsInputFile: sec.Key("IS_INPUT_FILE").MustBool(false),
NeedPostProcess: sec.Key("NEED_POSTPROCESS").MustBool(true),
RenderContentMode: renderContentMode,
})
}