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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"regexp"
"strings"
"code.gitea.io/gitea/modules/log"
"gopkg.in/ini.v1"
)
// ExternalMarkupRenderers represents the external markup renderers
var (
ExternalMarkupRenderers []*MarkupRenderer
ExternalSanitizerRules []MarkupSanitizerRule
MermaidMaxSourceCharacters int
)
const (
RenderContentModeSanitized = "sanitized"
RenderContentModeNoSanitizer = "no-sanitizer"
RenderContentModeIframe = "iframe"
)
// 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 newMarkup() {
MermaidMaxSourceCharacters = Cfg.Section("markup").Key("MERMAID_MAX_SOURCE_CHARACTERS").MustInt(5000)
ExternalMarkupRenderers = make([]*MarkupRenderer, 0, 10)
ExternalSanitizerRules = make([]MarkupSanitizerRule, 0, 10)
for _, sec := range Cfg.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 *ini.Section) {
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 *ini.Section) (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 *ini.Section) {
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,
})
}
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