From ee6786216a608fca2de322c90c7256577f2a500a Mon Sep 17 00:00:00 2001
From: Unknwon <joe2010xtmf@163.com>
Date: Fri, 30 Jan 2015 18:12:30 -0500
Subject: [PATCH] modules/base: clean code with #838

---
 models/repo.go           |  7 ++-----
 modules/base/markdown.go |  2 +-
 modules/base/template.go |  6 +-----
 modules/base/tool.go     | 30 +++---------------------------
 4 files changed, 7 insertions(+), 38 deletions(-)

diff --git a/models/repo.go b/models/repo.go
index 65689b6a1..58c099d49 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -7,7 +7,6 @@ package models
 import (
 	"errors"
 	"fmt"
-	"html"
 	"html/template"
 	"io/ioutil"
 	"os"
@@ -218,11 +217,9 @@ func (repo *Repository) HasAccess(uname string) bool {
 // DescriptionHtml does special handles to description and return HTML string.
 func (repo *Repository) DescriptionHtml() template.HTML {
 	sanitize := func(s string) string {
-		// TODO(nuss-justin): Improve sanitization. Strip all tags?
-		ss := html.EscapeString(s)
-		return fmt.Sprintf(`<a href="%s" target="_blank">%s</a>`, ss, ss)
+		return fmt.Sprintf(`<a href="%[1]s" target="_blank">%[1]s</a>`, s)
 	}
-	return template.HTML(DescPattern.ReplaceAllStringFunc(base.XSSString(repo.Description), sanitize))
+	return template.HTML(DescPattern.ReplaceAllStringFunc(base.Sanitizer.Sanitize(repo.Description), sanitize))
 }
 
 // IsRepositoryExist returns true if the repository with given name under user has already existed.
diff --git a/modules/base/markdown.go b/modules/base/markdown.go
index 2cd3617a8..c7369ab9f 100644
--- a/modules/base/markdown.go
+++ b/modules/base/markdown.go
@@ -212,7 +212,7 @@ func RenderRawMarkdown(body []byte, urlPrefix string) []byte {
 func RenderMarkdown(rawBytes []byte, urlPrefix string) []byte {
 	body := RenderSpecialLink(rawBytes, urlPrefix)
 	body = RenderRawMarkdown(body, urlPrefix)
-	body = XSS(body)
+	body = Sanitizer.SanitizeBytes(body)
 	return body
 }
 
diff --git a/modules/base/template.go b/modules/base/template.go
index 34caa4552..f3fa13857 100644
--- a/modules/base/template.go
+++ b/modules/base/template.go
@@ -13,7 +13,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/microcosm-cc/bluemonday"
 	"golang.org/x/net/html/charset"
 	"golang.org/x/text/transform"
 
@@ -21,11 +20,8 @@ import (
 	"github.com/gogits/gogs/modules/setting"
 )
 
-// FIXME: use me to Markdown API renders
-var p = bluemonday.UGCPolicy()
-
 func Str2html(raw string) template.HTML {
-	return template.HTML(p.Sanitize(raw))
+	return template.HTML(Sanitizer.Sanitize(raw))
 }
 
 func Range(l int) []int {
diff --git a/modules/base/tool.go b/modules/base/tool.go
index ff5a4f4cd..5043364ce 100644
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -15,17 +15,19 @@ import (
 	"hash"
 	"html/template"
 	"math"
-	"regexp"
 	"strings"
 	"time"
 
 	"github.com/Unknwon/com"
 	"github.com/Unknwon/i18n"
+	"github.com/microcosm-cc/bluemonday"
 
 	"github.com/gogits/gogs/modules/avatar"
 	"github.com/gogits/gogs/modules/setting"
 )
 
+var Sanitizer = bluemonday.UGCPolicy()
+
 // Encode string to md5 hex value.
 func EncodeMd5(str string) string {
 	m := md5.New()
@@ -473,29 +475,3 @@ func DateFormat(t time.Time, format string) string {
 	format = replacer.Replace(format)
 	return t.Format(format)
 }
-
-type xssFilter struct {
-	reg  *regexp.Regexp
-	repl []byte
-}
-
-var (
-	whiteSpace = []byte(" ")
-	xssFilters = []xssFilter{
-		{regexp.MustCompile(`\ [ONon]\w*=["]*`), whiteSpace},
-		{regexp.MustCompile(`<[SCRIPTscript]{6}`), whiteSpace},
-		{regexp.MustCompile(`=[` + "`" + `'"]*[JAVASCRIPTjavascript \t\0&#x0D;]*:`), whiteSpace},
-	}
-)
-
-// XSS goes through all the XSS filters to make user input content as safe as possible.
-func XSS(in []byte) []byte {
-	for _, filter := range xssFilters {
-		in = filter.reg.ReplaceAll(in, filter.repl)
-	}
-	return in
-}
-
-func XSSString(in string) string {
-	return string(XSS([]byte(in)))
-}