Fix some edge cases; closes #3232

- Fixes wrong usage of AppURL
- Fixes wrong rendering with extra path segments when AppSubURL is empty
- Now also renders all links when 2+ permalinks are present

(cherry picked from commit 5b6b3f3fb3)

modules/markup/file_preview.go

@@ -56,11 +56,11 @@ func NewFilePreview(ctx *RenderContext, node *html.Node, locale translation.Loca
 	urlFull := node.Data[m[0]:m[1]]
 
 	// Ensure that we only use links to local repositories
-	if !strings.HasPrefix(urlFull, setting.AppURL+setting.AppSubURL) {
+	if !strings.HasPrefix(urlFull, setting.AppURL) {
 		return nil
 	}
 
-	projPath := strings.TrimSuffix(node.Data[m[2]:m[3]], "/")
+	projPath := strings.TrimPrefix(strings.TrimSuffix(node.Data[m[0]:m[3]], "/"), setting.AppURL)
 
 	commitSha := node.Data[m[4]:m[5]]
 	filePath := node.Data[m[6]:m[7]]
@@ -70,6 +70,10 @@ func NewFilePreview(ctx *RenderContext, node *html.Node, locale translation.Loca
 	preview.end = m[1]
 
 	projPathSegments := strings.Split(projPath, "/")
+	if len(projPathSegments) != 2 {
+		return nil
+	}
+
 	ownerName := projPathSegments[len(projPathSegments)-2]
 	repoName := projPathSegments[len(projPathSegments)-1]
 

modules/markup/html.go

@@ -1063,8 +1063,6 @@ func filePreviewPatternProcessor(ctx *RenderContext, node *html.Node) {
 		return
 	}
 
-	next := node.NextSibling
-	for node != nil && node != next {
 	locale := translation.NewLocale("en-US")
 	if ctx.Ctx != nil {
 		ctxLocale, ok := ctx.Ctx.Value(translation.ContextKey).(translation.Locale)
@@ -1073,9 +1071,12 @@ func filePreviewPatternProcessor(ctx *RenderContext, node *html.Node) {
 		}
 	}
 
+	next := node.NextSibling
+	for node != nil && node != next {
 		preview := NewFilePreview(ctx, node, locale)
 		if preview == nil {
-			return
+			node = node.NextSibling
+			continue
 		}
 
 		previewNode := preview.CreateHTML(locale)

modules/markup/html_test.go

@@ -17,6 +17,7 @@ import (
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/markdown"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
 	"code.gitea.io/gitea/modules/translation"
 	"code.gitea.io/gitea/modules/util"
 
@@ -680,9 +681,9 @@ func TestIssue18471(t *testing.T) {
 }
 
 func TestRender_FilePreview(t *testing.T) {
-	setting.StaticRootPath = "../../"
-	setting.Names = []string{"english"}
-	setting.Langs = []string{"en-US"}
+	defer test.MockVariableValue(&setting.StaticRootPath, "../../")()
+	defer test.MockVariableValue(&setting.Names, []string{"english"})()
+	defer test.MockVariableValue(&setting.Langs, []string{"en-US"})()
 	translation.InitLocales(context.Background())
 
 	setting.AppURL = markup.TestAppURL
@@ -705,7 +706,7 @@ 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, metas map[string]string) {
+	testRender := func(input, expected string, metas map[string]string) {
 		buffer, err := markup.RenderString(&markup.RenderContext{
 			Ctx:          git.DefaultContext,
 			RelativePath: ".md",
@@ -715,7 +716,8 @@ func TestRender_FilePreview(t *testing.T) {
 		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(buffer))
 	}
 
-	test(
+	t.Run("single", func(t *testing.T) {
+		testRender(
 			commitFilePreview,
 			`<p></p>`+
 				`<div class="file-preview-box">`+
@@ -745,8 +747,10 @@ func TestRender_FilePreview(t *testing.T) {
 				`<p></p>`,
 			localMetas,
 		)
+	})
 
-	test(
+	t.Run("cross-repo", func(t *testing.T) {
+		testRender(
 			commitFilePreview,
 			`<p></p>`+
 				`<div class="file-preview-box">`+
@@ -780,4 +784,107 @@ func TestRender_FilePreview(t *testing.T) {
 				"repo": "gogs2",
 			},
 		)
+	})
+
+	t.Run("AppSubURL", func(t *testing.T) {
+		urlWithSub := util.URLJoin(markup.TestAppURL, "sub", markup.TestOrgRepo, "src", "commit", sha, "path", "to", "file.go") + "#L2-L3"
+
+		testRender(
+			urlWithSub,
+			`<p><a href="http://localhost:3000/sub/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20/path/to/file.go#L2-L3" rel="nofollow"><code>190d949293/path/to/file.go (L2-L3)</code></a></p>`,
+			localMetas,
+		)
+
+		defer test.MockVariableValue(&setting.AppURL, markup.TestAppURL+"sub/")()
+		defer test.MockVariableValue(&setting.AppSubURL, "/sub")()
+
+		testRender(
+			urlWithSub,
+			`<p></p>`+
+				`<div class="file-preview-box">`+
+				`<div class="header">`+
+				`<div>`+
+				`<a href="http://localhost:3000/sub/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/sub/gogits/gogs/src/commit/190d9492934af498c3f669d6a2431dc5459e5b20" class="text black" rel="nofollow">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>`,
+			localMetas,
+		)
+	})
+
+	t.Run("multiples", func(t *testing.T) {
+		testRender(
+			"first "+commitFilePreview+" second "+commitFilePreview,
+			`<p>first </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>`+
+				`</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> second </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>`+
+				`</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>`,
+			localMetas,
+		)
+	})
 }