fix

Author: wxiaoguang

custom/conf/app.example.ini

@@ -2541,6 +2541,11 @@ LEVEL = Info
 ;; * no-sanitizer: Disable the sanitizer and render the content inside current page. It's **insecure** and may lead to XSS attack if the content contains malicious code.
 ;; * iframe: Render the content in a separate standalone page and embed it into current page by iframe. The iframe is in sandbox mode with same-origin disabled, and the JS code are safely isolated from parent page.
 ;RENDER_CONTENT_MODE=sanitized
+;;
+;; Whether post-process the rendered HTML content, including:
+;; resolve relative links and image sources, recognizing issue/commit references, escaping invisible characters,
+;; mentioning users, rendering permlink code blocks, replacing emoji shorthands, etc.
+;NEED_POST_PROCESS=false
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

modules/markup/external/external.go

@@ -15,6 +15,8 @@ import (
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/kballard/go-shellquote"
 )
 
 // RegisterRenderers registers all supported third part renderers according settings
@@ -81,7 +83,10 @@ func (p *Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.
 		envMark("GITEA_PREFIX_SRC"), baseLinkSrc,
 		envMark("GITEA_PREFIX_RAW"), baseLinkRaw,
 	).Replace(p.Command)
-	commands := strings.Fields(command)
+	commands, err := shellquote.Split(command)
+	if err != nil || len(commands) == 0 {
+		return fmt.Errorf("%s invalid command %q: %w", p.Name(), p.Command, err)
+	}
 	args := commands[1:]
 
 	if p.IsInputFile {

modules/markup/render.go

@@ -120,31 +120,36 @@ func (ctx *RenderContext) WithHelper(helper RenderHelper) *RenderContext {
 	return ctx
 }
 
-// Render renders markup file to HTML with all specific handling stuff.
-func Render(ctx *RenderContext, input io.Reader, output io.Writer) error {
+func FindRenderer(ctx *RenderContext) (Renderer, error) {
 	if ctx.RenderOptions.MarkupType == "" && ctx.RenderOptions.RelativePath != "" {
 		ctx.RenderOptions.MarkupType = DetectMarkupTypeByFileName(ctx.RenderOptions.RelativePath)
 		if ctx.RenderOptions.MarkupType == "" {
-			return util.NewInvalidArgumentErrorf("unsupported file to render: %q", ctx.RenderOptions.RelativePath)
+			return nil, util.NewInvalidArgumentErrorf("unsupported file to render: %q", ctx.RenderOptions.RelativePath)
 		}
 	}
 
 	renderer := renderers[ctx.RenderOptions.MarkupType]
 	if renderer == nil {
-		return util.NewInvalidArgumentErrorf("unsupported markup type: %q", ctx.RenderOptions.MarkupType)
+		return nil, util.NewNotExistErrorf("unsupported markup type: %q", ctx.RenderOptions.MarkupType)
 	}
 
-	if ctx.RenderOptions.RelativePath != "" {
-		if externalRender, ok := renderer.(ExternalRenderer); ok && externalRender.DisplayInIFrame() {
-			if !ctx.RenderOptions.InStandalonePage {
-				// for an external "DisplayInIFrame" render, it could only output its content in a standalone page
-				// otherwise, a <iframe> should be outputted to embed the external rendered page
-				return renderIFrame(ctx, output)
-			}
-		}
+	return renderer, nil
+}
+
+func RendererNeedPostProcess(renderer Renderer) bool {
+	if r, ok := renderer.(PostProcessRenderer); ok && r.NeedPostProcess() {
+		return true
 	}
+	return false
+}
 
-	return render(ctx, renderer, input, output)
+// Render renders markup file to HTML with all specific handling stuff.
+func Render(ctx *RenderContext, input io.Reader, output io.Writer) error {
+	renderer, err := FindRenderer(ctx)
+	if err != nil {
+		return err
+	}
+	return RenderWithRenderer(ctx, renderer, input, output)
 }
 
 // RenderString renders Markup string to HTML with all specific handling stuff and return string
@@ -185,7 +190,17 @@ func pipes() (io.ReadCloser, io.WriteCloser, func()) {
 	}
 }
 
-func render(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Writer) error {
+func RenderWithRenderer(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Writer) error {
+	if ctx.RenderOptions.RelativePath != "" {
+		if externalRender, ok := renderer.(ExternalRenderer); ok && externalRender.DisplayInIFrame() {
+			if !ctx.RenderOptions.InStandalonePage {
+				// for an external "DisplayInIFrame" render, it could only output its content in a standalone page
+				// otherwise, a <iframe> should be outputted to embed the external rendered page
+				return renderIFrame(ctx, output)
+			}
+		}
+	}
+
 	ctx.usedByRender = true
 	if ctx.RenderHelper != nil {
 		defer ctx.RenderHelper.CleanUp()
@@ -214,7 +229,7 @@ func render(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Wr
 	}
 
 	eg.Go(func() (err error) {
-		if r, ok := renderer.(PostProcessRenderer); ok && r.NeedPostProcess() {
+		if RendererNeedPostProcess(renderer) {
 			err = PostProcessDefault(ctx, pr1, pw2)
 		} else {
 			_, err = io.Copy(pw2, pr1)

modules/setting/markup.go

@@ -259,7 +259,9 @@ func newMarkupRenderer(name string, sec ConfigSection) {
 		FileExtensions:    exts,
 		Command:           command,
 		IsInputFile:       sec.Key("IS_INPUT_FILE").MustBool(false),
-		NeedPostProcess:   sec.Key("NEED_POSTPROCESS").MustBool(true),
 		RenderContentMode: renderContentMode,
+
+		// if no sanitizer is needed, no post process is needed
+		NeedPostProcess: sec.Key("NEED_POST_PROCESS").MustBool(renderContentMode == RenderContentModeSanitized),
 	})
 }

routers/web/repo/view.go

@@ -151,17 +151,28 @@ func loadLatestCommitData(ctx *context.Context, latestCommit *git.Commit) bool {
 }
 
 func markupRender(ctx *context.Context, renderCtx *markup.RenderContext, input io.Reader) (escaped *charset.EscapeStatus, output template.HTML, err error) {
+	renderer, err := markup.FindRenderer(renderCtx)
+	if err != nil {
+		return nil, "", err
+	}
+
 	markupRd, markupWr := io.Pipe()
 	defer markupWr.Close()
+
 	done := make(chan struct{})
 	go func() {
 		sb := &strings.Builder{}
-		// We allow NBSP here this is rendered
-		escaped, _ = charset.EscapeControlReader(markupRd, sb, ctx.Locale, charset.RuneNBSP)
+		if markup.RendererNeedPostProcess(renderer) {
+			escaped, _ = charset.EscapeControlReader(markupRd, sb, ctx.Locale, charset.RuneNBSP) // We allow NBSP here this is rendered
+		} else {
+			escaped = &charset.EscapeStatus{}
+			_, _ = io.Copy(sb, markupRd)
+		}
 		output = template.HTML(sb.String())
 		close(done)
 	}()
-	err = markup.Render(renderCtx, input, markupWr)
+
+	err = markup.RenderWithRenderer(renderCtx, renderer, input, markupWr)
 	_ = markupWr.CloseWithError(err)
 	<-done
 	return escaped, output, err

templates/repo/view_file.tmpl

@@ -93,7 +93,7 @@
 		{{if not .IsMarkup}}
 			{{template "repo/unicode_escape_prompt" dict "EscapeStatus" .EscapeStatus}}
 		{{end}}
-		<div class="file-view {{if .IsMarkup}}markup {{.MarkupType}}{{else if .IsPlainText}}plain-text{{else if .IsDisplayingSource}}code-view{{end}}">
+		<div class="file-view {{if .IsMarkup}}markup markup-type-{{.MarkupType}}{{else if .IsPlainText}}plain-text{{else if .IsDisplayingSource}}code-view{{end}}">
 			{{if .IsFileTooLarge}}
 				{{template "shared/filetoolarge" dict "RawFileLink" .RawFileLink}}
 			{{else if not .FileSize}}