Fix inline permalinks across repo; closes #2965 (#3042)

This PR fixes the possible ambiguity of rendered inline permalinks across repos by adding it as a suffix to the title element if the permalink refers to a file not inside the current repository. Closes #2965

![grafik](/attachments/e70e37b8-24c7-4f7b-ab52-92f1e8dfb009)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3042
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Mai-Lapyst <mai-lapyst@noreply.codeberg.org>
Co-committed-by: Mai-Lapyst <mai-lapyst@noreply.codeberg.org>
(cherry picked from commit 1d1c0131bb)

modules/markup/file_preview.go

@@ -27,10 +27,9 @@ var filePreviewPattern = regexp.MustCompile(`https?://((?:\S+/){3})src/commit/([
 
 type FilePreview struct {
 	fileContent []template.HTML
+	title       template.HTML
 	subTitle    template.HTML
 	lineOffset  int
-	urlFull     string
-	filePath    string
 	start       int
 	end         int
 	isTruncated bool
@@ -54,39 +53,65 @@ func NewFilePreview(ctx *RenderContext, node *html.Node, locale translation.Loca
 		return nil
 	}
 
-	preview.urlFull = node.Data[m[0]:m[1]]
+	urlFull := node.Data[m[0]:m[1]]
 
 	// Ensure that we only use links to local repositories
-	if !strings.HasPrefix(preview.urlFull, setting.AppURL+setting.AppSubURL) {
+	if !strings.HasPrefix(urlFull, setting.AppURL+setting.AppSubURL) {
 		return nil
 	}
 
 	projPath := strings.TrimSuffix(node.Data[m[2]:m[3]], "/")
 
 	commitSha := node.Data[m[4]:m[5]]
-	preview.filePath = node.Data[m[6]:m[7]]
+	filePath := node.Data[m[6]:m[7]]
 	hash := node.Data[m[8]:m[9]]
 
 	preview.start = m[0]
 	preview.end = m[1]
 
 	projPathSegments := strings.Split(projPath, "/")
+	ownerName := projPathSegments[len(projPathSegments)-2]
+	repoName := projPathSegments[len(projPathSegments)-1]
+
 	var language string
 	fileBlob, err := DefaultProcessorHelper.GetRepoFileBlob(
 		ctx.Ctx,
-		projPathSegments[len(projPathSegments)-2],
-		projPathSegments[len(projPathSegments)-1],
-		commitSha, preview.filePath,
+		ownerName,
+		repoName,
+		commitSha, filePath,
 		&language,
 	)
 	if err != nil {
 		return nil
 	}
 
+	titleBuffer := new(bytes.Buffer)
+
+	isExternRef := ownerName != ctx.Metas["user"] || repoName != ctx.Metas["repo"]
+	if isExternRef {
+		err = html.Render(titleBuffer, createLink(node.Data[m[0]:m[3]], ownerName+"/"+repoName, ""))
+		if err != nil {
+			log.Error("failed to render repoLink: %v", err)
+		}
+		titleBuffer.WriteString(" – ")
+	}
+
+	err = html.Render(titleBuffer, createLink(urlFull, filePath, "muted"))
+	if err != nil {
+		log.Error("failed to render filepathLink: %v", err)
+	}
+
+	preview.title = template.HTML(titleBuffer.String())
+
 	lineSpecs := strings.Split(hash, "-")
 
 	commitLinkBuffer := new(bytes.Buffer)
-	err = html.Render(commitLinkBuffer, createLink(node.Data[m[0]:m[5]], commitSha[0:7], "text black"))
+	commitLinkText := commitSha[0:7]
+	if isExternRef {
+		commitLinkText = ownerName + "/" + repoName + "@" + commitLinkText
+	}
+
+	err = html.Render(commitLinkBuffer, createLink(node.Data[m[0]:m[5]], commitLinkText, "text black"))
 	if err != nil {
 		log.Error("failed to render commitLink: %v", err)
 	}
@@ -272,19 +297,16 @@ func (p *FilePreview) CreateHTML(locale translation.Locale) *html.Node {
 		Data: atom.Div.String(),
 		Attr: []html.Attribute{{Key: "class", Val: "header"}},
 	}
-	afilepath := &html.Node{
+
+	ptitle := &html.Node{
 		Type: html.ElementNode,
-		Data: atom.A.String(),
-		Attr: []html.Attribute{
-			{Key: "href", Val: p.urlFull},
-			{Key: "class", Val: "muted"},
-		},
+		Data: atom.Div.String(),
 	}
-	afilepath.AppendChild(&html.Node{
-		Type: html.TextNode,
-		Data: p.filePath,
+	ptitle.AppendChild(&html.Node{
+		Type: html.RawNode,
+		Data: string(p.title),
 	})
-	header.AppendChild(afilepath)
+	header.AppendChild(ptitle)
 
 	psubtitle := &html.Node{
 		Type: html.ElementNode,

modules/markup/html.go

@@ -1056,7 +1056,7 @@ func comparePatternProcessor(ctx *RenderContext, node *html.Node) {
 }
 
 func filePreviewPatternProcessor(ctx *RenderContext, node *html.Node) {
-	if ctx.Metas == nil {
+	if ctx.Metas == nil || ctx.Metas["user"] == "" || ctx.Metas["repo"] == "" {
 		return
 	}
 	if DefaultProcessorHelper.GetRepoFileBlob == nil {

modules/markup/html_test.go

@@ -705,11 +705,11 @@ func TestRender_FilePreview(t *testing.T) {
 	sha := "190d9492934af498c3f669d6a2431dc5459e5b20"
 	commitFilePreview := util.URLJoin(markup.TestRepoURL, "src", "commit", sha, "path", "to", "file.go") + "#L2-L3"
 
-	test := func(input, expected string) {
+	test := func(input, expected string, metas map[string]string) {
 		buffer, err := markup.RenderString(&markup.RenderContext{
 			Ctx:          git.DefaultContext,
 			RelativePath: ".md",
-			Metas:        localMetas,
+			Metas:        metas,
 		}, input)
 		assert.NoError(t, err)
 		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(buffer))
@@ -720,7 +720,9 @@ func TestRender_FilePreview(t *testing.T) {
 		`<p></p>`+
 			`<div class="file-preview-box">`+
 			`<div class="header">`+
+			`<div>`+
 			`<a href="http://localhost:3000/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20/path/to/file.go#L2-L3" class="muted" rel="nofollow">path/to/file.go</a>`+
+			`</div>`+
 			`<span class="text small grey">`+
 			`Lines 2 to 3 in <a href="http://localhost:3000/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20" class="text black" rel="nofollow">190d949</a>`+
 			`</span>`+
@@ -741,5 +743,41 @@ func TestRender_FilePreview(t *testing.T) {
 			`</div>`+
 			`</div>`+
 			`<p></p>`,
+		localMetas,
+	)
+
+	test(
+		commitFilePreview,
+		`<p></p>`+
+			`<div class="file-preview-box">`+
+			`<div class="header">`+
+			`<div>`+
+			`<a href="http://localhost:3000/gogits/gogs/" rel="nofollow">gogits/gogs</a> – `+
+			`<a href="http://localhost:3000/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20/path/to/file.go#L2-L3" class="muted" rel="nofollow">path/to/file.go</a>`+
+			`</div>`+
+			`<span class="text small grey">`+
+			`Lines 2 to 3 in <a href="http://localhost:3000/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20" class="text black" rel="nofollow">gogits/gogs@190d949</a>`+
+			`</span>`+
+			`</div>`+
+			`<div class="ui table">`+
+			`<table class="file-preview">`+
+			`<tbody>`+
+			`<tr>`+
+			`<td class="lines-num"><span data-line-number="2"></span></td>`+
+			`<td class="lines-code chroma"><code class="code-inner"><span class="nx">B</span>`+"\n"+`</code></td>`+
+			`</tr>`+
+			`<tr>`+
+			`<td class="lines-num"><span data-line-number="3"></span></td>`+
+			`<td class="lines-code chroma"><code class="code-inner"><span class="nx">C</span>`+"\n"+`</code></td>`+
+			`</tr>`+
+			`</tbody>`+
+			`</table>`+
+			`</div>`+
+			`</div>`+
+			`<p></p>`,
+		map[string]string{
+			"user": "gogits",
+			"repo": "gogs2",
+		},
 	)
 }