refactor: markup render (#38864) (#38869)

backport #38864

1. add missing CSP header to api & web render endpoints.
2. make jupyter render skip post-processors, nothing to process

modules/markup/external/frontend.go

@@ -21,19 +21,12 @@ type frontendRenderer struct {
 	patterns []string
 }
 
-var (
-	_ markup.PostProcessRenderer = (*frontendRenderer)(nil)
-	_ markup.ExternalRenderer    = (*frontendRenderer)(nil)
-)
+var _ markup.ExternalRenderer = (*frontendRenderer)(nil)
 
 func (p *frontendRenderer) Name() string {
 	return p.name
 }
 
-func (p *frontendRenderer) NeedPostProcess() bool {
-	return false
-}
-
 func (p *frontendRenderer) FileNamePatterns() []string {
 	// TODO: the file extensions are ambiguous, even if the file name matches, it doesn't mean that the file is a 3D model
 	// There are some approaches to make it more accurate, but they are all complicated:

modules/markup/jupyter/jupyter.go

@@ -29,9 +29,8 @@ func init() {
 type renderer struct{}
 
 var (
-	_ markup.Renderer            = (*renderer)(nil)
-	_ markup.PostProcessRenderer = (*renderer)(nil)
-	_ markup.ExternalRenderer    = (*renderer)(nil) // FIXME: this is not an external render, need to refactor the framework in the future
+	_ markup.Renderer         = (*renderer)(nil)
+	_ markup.ExternalRenderer = (*renderer)(nil) // FIXME: this is not an external render, need to refactor the framework in the future
 )
 
 type mimeHandler struct {
@@ -96,8 +95,6 @@ func (renderer) Name() string {
 	return "jupyter-render"
 }
 
-func (renderer) NeedPostProcess() bool { return true }
-
 func (renderer) GetExternalRendererOptions() markup.ExternalRendererOptions {
 	return markup.ExternalRendererOptions{
 		// HINT: no need to let markup render sanitize the output because there are many special CSS class names, inline attributes.

modules/markup/jupyter/jupyter_test.go

@@ -274,7 +274,7 @@ func TestIntegrationAndSanitization(t *testing.T) {
 						"execution_count": 1,
 						"data": {
 							"text/html": [
-								"<div><script>alert('XSS Vector')</script><table class=\"dataframe\"><tr><td>Safe Content</td></tr></table></div>"
+								"<div><script>foo</script><table class=other><tr><td>[[name=no-post-process|link=/link]]</td></tr></table></div>"
 							]
 						},
 						"metadata": {}
@@ -304,7 +304,7 @@ func TestIntegrationAndSanitization(t *testing.T) {
 			<div class="cell-left cell-prompt">Out [1]:</div>
 			<div class="cell-right cell-output">
 				<div class="cell-output-html">
-					<div><table><tbody><tr><td>Safe Content</td></tr></tbody></table></div>
+					<div><table><tr><td>[[name=no-post-process|link=/link]]</td></tr></table></div>
 				</div>
 			</div>
 		</div>

modules/markup/main_test.go

@@ -14,7 +14,6 @@ import (
 func TestMain(m *testing.M) {
 	setting.IsInTesting = true
 	markup.RenderBehaviorForTesting.DisableAdditionalAttributes = true
-	setting.Markdown.FileNamePatterns = []string{"*.md"}
 	markup.RefreshFileNamePatterns()
 	os.Exit(m.Run())
 }

modules/setting/markup.go

@@ -50,7 +50,8 @@ var Markdown = struct {
 	MathCodeBlockDetection []string
 	MathCodeBlockOptions   MarkdownMathCodeBlockOptions `ini:"-"`
 }{
-	EnableMath: true,
+	EnableMath:       true,
+	FileNamePatterns: []string{"*.md"},
 }
 
 // MarkupRenderer defines the external parser configured in ini