138 lines
3.6 KiB
Go
138 lines
3.6 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package setting
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import (
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"regexp"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"gopkg.in/ini.v1"
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)
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// ExternalMarkupRenderers represents the external markup renderers
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var (
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ExternalMarkupRenderers []MarkupRenderer
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ExternalSanitizerRules []MarkupSanitizerRule
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)
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// MarkupRenderer defines the external parser configured in ini
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type MarkupRenderer struct {
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Enabled bool
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MarkupName string
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Command string
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FileExtensions []string
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IsInputFile bool
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NeedPostProcess bool
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}
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// MarkupSanitizerRule defines the policy for whitelisting attributes on
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// certain elements.
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type MarkupSanitizerRule struct {
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Element string
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AllowAttr string
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Regexp *regexp.Regexp
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}
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func newMarkup() {
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ExternalMarkupRenderers = make([]MarkupRenderer, 0, 10)
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ExternalSanitizerRules = make([]MarkupSanitizerRule, 0, 10)
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for _, sec := range Cfg.Section("markup").ChildSections() {
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name := strings.TrimPrefix(sec.Name(), "markup.")
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if name == "" {
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log.Warn("name is empty, markup " + sec.Name() + "ignored")
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continue
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}
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if name == "sanitizer" || strings.HasPrefix(name, "sanitizer.") {
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newMarkupSanitizer(name, sec)
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} else {
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newMarkupRenderer(name, sec)
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}
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}
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}
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func newMarkupSanitizer(name string, sec *ini.Section) {
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haveElement := sec.HasKey("ELEMENT")
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haveAttr := sec.HasKey("ALLOW_ATTR")
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haveRegexp := sec.HasKey("REGEXP")
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if !haveElement && !haveAttr && !haveRegexp {
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log.Warn("Skipping empty section: markup.%s.", name)
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return
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}
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if !haveElement || !haveAttr || !haveRegexp {
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log.Error("Missing required keys from markup.%s. Must have all three of ELEMENT, ALLOW_ATTR, and REGEXP defined!", name)
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return
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}
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elements := sec.Key("ELEMENT").Value()
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allowAttrs := sec.Key("ALLOW_ATTR").Value()
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regexpStr := sec.Key("REGEXP").Value()
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if regexpStr == "" {
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rule := MarkupSanitizerRule{
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Element: elements,
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AllowAttr: allowAttrs,
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Regexp: nil,
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}
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ExternalSanitizerRules = append(ExternalSanitizerRules, rule)
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return
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}
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// Validate when parsing the config that this is a valid regular
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// expression. Then we can use regexp.MustCompile(...) later.
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compiled, err := regexp.Compile(regexpStr)
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if err != nil {
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log.Error("In module.%s: REGEXP (%s) at definition %d failed to compile: %v", regexpStr, name, err)
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return
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}
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rule := MarkupSanitizerRule{
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Element: elements,
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AllowAttr: allowAttrs,
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Regexp: compiled,
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}
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ExternalSanitizerRules = append(ExternalSanitizerRules, rule)
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}
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func newMarkupRenderer(name string, sec *ini.Section) {
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extensionReg := regexp.MustCompile(`\.\w`)
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extensions := sec.Key("FILE_EXTENSIONS").Strings(",")
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var exts = make([]string, 0, len(extensions))
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for _, extension := range extensions {
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if !extensionReg.MatchString(extension) {
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log.Warn(sec.Name() + " file extension " + extension + " is invalid. Extension ignored")
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} else {
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exts = append(exts, extension)
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}
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}
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if len(exts) == 0 {
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log.Warn(sec.Name() + " file extension is empty, markup " + name + " ignored")
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return
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}
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command := sec.Key("RENDER_COMMAND").MustString("")
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if command == "" {
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log.Warn(" RENDER_COMMAND is empty, markup " + name + " ignored")
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return
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}
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ExternalMarkupRenderers = append(ExternalMarkupRenderers, MarkupRenderer{
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Enabled: sec.Key("ENABLED").MustBool(false),
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MarkupName: name,
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FileExtensions: exts,
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Command: command,
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IsInputFile: sec.Key("IS_INPUT_FILE").MustBool(false),
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NeedPostProcess: sec.Key("NEED_POSTPROCESS").MustBool(true),
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})
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}
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