first-commit

modules/markup/sanitizer.go

@@ -0,0 +1,51 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Copyright 2017 The Gogs Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markup
+
+import (
+	"regexp"
+	"sync"
+
+	"github.com/microcosm-cc/bluemonday"
+)
+
+// Sanitizer is a protection wrapper of *bluemonday.Policy which does not allow
+// any modification to the underlying policies once it's been created.
+type Sanitizer struct {
+	defaultPolicy     *bluemonday.Policy
+	descriptionPolicy *bluemonday.Policy
+	rendererPolicies  map[string]*bluemonday.Policy
+	allowAllRegex     *regexp.Regexp
+}
+
+var (
+	defaultSanitizer     *Sanitizer
+	defaultSanitizerOnce sync.Once
+)
+
+func GetDefaultSanitizer() *Sanitizer {
+	defaultSanitizerOnce.Do(func() {
+		defaultSanitizer = &Sanitizer{
+			rendererPolicies: map[string]*bluemonday.Policy{},
+			allowAllRegex:    regexp.MustCompile(".+"),
+		}
+		for name, renderer := range renderers {
+			sanitizerRules := renderer.SanitizerRules()
+			if len(sanitizerRules) > 0 {
+				policy := defaultSanitizer.createDefaultPolicy()
+				defaultSanitizer.addSanitizerRules(policy, sanitizerRules)
+				defaultSanitizer.rendererPolicies[name] = policy
+			}
+		}
+		defaultSanitizer.defaultPolicy = defaultSanitizer.createDefaultPolicy()
+		defaultSanitizer.descriptionPolicy = defaultSanitizer.createRepoDescriptionPolicy()
+	})
+	return defaultSanitizer
+}
+
+func ResetDefaultSanitizerForTesting() {
+	defaultSanitizer = nil
+	defaultSanitizerOnce = sync.Once{}
+}