Remove unnecessary SanitizeHTML from code (#29575)

* "mail/issue/default.tmpl": the body is rendered by backend
`markdown.RenderString() HTML`, it has been already sanitized
* "repo/settings/webhook/base_list.tmpl": "Description" is prepared by
backend `ctx.Tr`, it doesn't need to be sanitized

7 files changed, 7 insertions, 14 deletions

diff --git a/docs/content/administration/mail-templates.en-us.md b/docs/content/administration/mail-templates.en-us.md
index 0154fe55d0..4026b89975 100644
--- a/docs/content/administration/mail-templates.en-us.md
+++ b/docs/content/administration/mail-templates.en-us.md
@@ -224,7 +224,7 @@ Please check [Gitea's logs](administration/logging-config.md) for error messages
         {{if not (eq .Body "")}}
             <h3>Message content</h3>
             <hr>
-            {{.Body | SanitizeHTML}}
+            {{.Body}}
         {{end}}
     </p>
     <hr>
diff --git a/docs/content/administration/mail-templates.zh-cn.md b/docs/content/administration/mail-templates.zh-cn.md
index e8c2817336..3c7c2a9397 100644
--- a/docs/content/administration/mail-templates.zh-cn.md
+++ b/docs/content/administration/mail-templates.zh-cn.md
@@ -207,7 +207,7 @@ _主题_ 和 _邮件正文_ 由 [Golang的模板引擎](https://go.dev/pkg/text/
         {{if not (eq .Body "")}}
             <h3>消息内容：</h3>
             <hr>
-            {{.Body | SanitizeHTML}}
+            {{.Body}}
         {{end}}
     </p>
     <hr>
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 1487fce69d..0997239a55 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -208,14 +208,8 @@ func SafeHTML(s any) template.HTML {
 }
 
 // SanitizeHTML sanitizes the input by pre-defined markdown rules
-func SanitizeHTML(s any) template.HTML {
-	switch v := s.(type) {
-	case string:
-		return template.HTML(markup.Sanitize(v))
-	case template.HTML:
-		return template.HTML(markup.Sanitize(string(v)))
-	}
-	panic(fmt.Sprintf("unexpected type %T", s))
+func SanitizeHTML(s string) template.HTML {
+	return template.HTML(markup.Sanitize(s))
 }
 
 func HTMLEscape(s any) template.HTML {
diff --git a/modules/templates/helper_test.go b/modules/templates/helper_test.go
index 3365278ac2..64f29d033e 100644
--- a/modules/templates/helper_test.go
+++ b/modules/templates/helper_test.go
@@ -64,5 +64,4 @@ func TestHTMLFormat(t *testing.T) {
 
 func TestSanitizeHTML(t *testing.T) {
 	assert.Equal(t, template.HTML(`<a href="/" rel="nofollow">link</a> xss <div>inline</div>`), SanitizeHTML(`<a href="/">link</a> <a href="javascript:">xss</a> <div style="dangerous">inline</div>`))
-	assert.Equal(t, template.HTML(`<a href="/" rel="nofollow">link</a> xss <div>inline</div>`), SanitizeHTML(template.HTML(`<a href="/">link</a> <a href="javascript:">xss</a> <div style="dangerous">inline</div>`)))
 }
diff --git a/templates/mail/issue/default.tmpl b/templates/mail/issue/default.tmpl
index 021ca3989d..395b118d3e 100644
--- a/templates/mail/issue/default.tmpl
+++ b/templates/mail/issue/default.tmpl
@@ -58,7 +58,7 @@
 				{{.locale.Tr "mail.issue.action.new" .Doer.Name .Issue.Index}}
 			{{end}}
 		{{else}}
-			{{.Body | SanitizeHTML}}
+			{{.Body}}
 		{{end -}}
 		{{- range .ReviewComments}}
 			<hr>
diff --git a/templates/repo/settings/webhook/base_list.tmpl b/templates/repo/settings/webhook/base_list.tmpl
index 00f9a48ba7..e56929b70f 100644
--- a/templates/repo/settings/webhook/base_list.tmpl
+++ b/templates/repo/settings/webhook/base_list.tmpl
@@ -10,7 +10,7 @@
 <div class="ui attached segment">
 	<div class="ui list">
 		<div class="item">
-			{{.Description | SanitizeHTML}}
+			{{.Description}}
 		</div>
 		{{range .Webhooks}}
 			<div class="item truncated-item-container">
diff --git a/templates/status/500.tmpl b/templates/status/500.tmpl
index 58795e4bc0..03d0183280 100644
--- a/templates/status/500.tmpl
+++ b/templates/status/500.tmpl
@@ -1,5 +1,5 @@
 {{/* This page should only depend the minimal template functions/variables, to avoid triggering new panics.
-* base template functions: AppName, AssetUrlPrefix, AssetVersion, AppSubUrl, ThemeName, SanitizeHTML
+* base template functions: AppName, AssetUrlPrefix, AssetVersion, AppSubUrl, ThemeName
 * ctx.Locale
 * .Flash
 * .ErrorMsg