fix #1501 ssh hangs caused by #1461 (#1513)

Author: lunny

modules/markdown/sanitizer.go

@@ -9,7 +9,6 @@ import (
 	"regexp"
 	"sync"
 
-	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/microcosm-cc/bluemonday"
@@ -28,7 +27,6 @@ var sanitizer = &Sanitizer{}
 // Multiple calls to this function will only create one instance of Sanitizer during
 // entire application lifecycle.
 func NewSanitizer() {
-	log.Trace("Markdown: sanitizer initialization requested")
 	sanitizer.init.Do(func() {
 		sanitizer.policy = bluemonday.UGCPolicy()
 		// We only want to allow HighlightJS specific classes for code blocks
@@ -40,16 +38,12 @@ func NewSanitizer() {
 
 		// Custom URL-Schemes
 		sanitizer.policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
-
-		log.Trace("Markdown: sanitizer initialized")
 	})
 }
 
 // Sanitize takes a string that contains a HTML fragment or document and applies policy whitelist.
 func Sanitize(s string) string {
-	if sanitizer.policy == nil {
-		NewSanitizer()
-	}
+	NewSanitizer()
 	return sanitizer.policy.Sanitize(s)
 }
 
@@ -59,8 +53,6 @@ func SanitizeBytes(b []byte) []byte {
 		// nothing to sanitize
 		return b
 	}
-	if sanitizer.policy == nil {
-		NewSanitizer()
-	}
+	NewSanitizer()
 	return sanitizer.policy.SanitizeBytes(b)
 }