feat(pages): serve gallery images via asset endpoint

Add support for serving gallery images through /assets/gallery/ endpoint instead of /raw/ URLs. Maps gallery/ asset paths to .gallery/ folder in repo. Works for both repo-path mode and custom domain mode. Refactors asset serving into shared serveRepoFileAsset helper. Improves URL consistency and allows proper caching headers for gallery images on landing pages.

routers/web/pages/pages.go

@@ -70,6 +70,12 @@ func ServeLandingPage(ctx *context.Context) {
 		return
 	}
 
+	// Handle asset requests (gallery images, custom assets)
+	if assetPath, found := strings.CutPrefix(requestPath, "/assets/"); found && assetPath != "" {
+		serveCustomDomainAsset(ctx, repo, assetPath)
+		return
+	}
+
 	// Check for blog paths on custom domain
 	if config.Blog.Enabled && repo.BlogEnabled {
 		if idStr, found := strings.CutPrefix(requestPath, "/blog/"); found {
@@ -166,6 +172,16 @@ func setupLandingPageContext(ctx *context.Context, repo *repo_model.Repository,
 	ctx.Data["HideMobileReleases"] = config.Advanced.HideMobileReleases
 }
 
+// galleryAssetBaseURL returns the base URL for gallery image assets.
+// For repo-path mode (ctx.Repo is set), it returns /{owner}/{repo}/pages/assets/gallery/
+// For custom domain / subdomain mode, it returns /assets/gallery/
+func galleryAssetBaseURL(ctx *context.Context, repo *repo_model.Repository) string {
+	if ctx.Repo != nil && ctx.Repo.Repository != nil {
+		return repo.Link() + "/pages/assets/gallery/"
+	}
+	return "/assets/gallery/"
+}
+
 // renderLandingPage renders the landing page based on the template
 func renderLandingPage(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) {
 	setupLandingPageContext(ctx, repo, config)
@@ -200,7 +216,8 @@ func renderLandingPage(ctx *context.Context, repo *repo_model.Repository, config
 
 	// Load gallery images if gallery section is enabled
 	if config.Gallery.Enabled {
-		images := loadGalleryImagesForLanding(ctx, repo, config)
+		baseURL := galleryAssetBaseURL(ctx, repo)
+		images := loadGalleryImagesForLanding(ctx, repo, config, baseURL)
 		if len(images) > 0 {
 			ctx.Data["GalleryImages"] = images
 		}
@@ -333,7 +350,7 @@ type GalleryImageInfo struct {
 }
 
 // loadGalleryImagesForLanding reads gallery images from the .gallery folder
-func loadGalleryImagesForLanding(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig) []GalleryImageInfo {
+func loadGalleryImagesForLanding(ctx *context.Context, repo *repo_model.Repository, config *pages_module.LandingConfig, baseURL string) []GalleryImageInfo {
 	if repo.IsEmpty {
 		return nil
 	}
@@ -403,7 +420,7 @@ func loadGalleryImagesForLanding(ctx *context.Context, repo *repo_model.Reposito
 		images = append(images, GalleryImageInfo{
 			Name:    name,
 			Caption: captionMap[name],
-			URL:     repo.Link() + "/raw/" + repo.DefaultBranch + "/.gallery/" + name,
+			URL:     baseURL + name,
 		})
 		if len(images) >= maxImages {
 			break
@@ -501,6 +518,29 @@ func selectTemplate(templateName string) templates.TplName {
 	}
 }
 
+// serveCustomDomainAsset serves asset files for custom domain / subdomain requests.
+func serveCustomDomainAsset(ctx *context.Context, repo *repo_model.Repository, assetPath string) {
+	gitRepo, err := git.OpenRepository(ctx, repo.RepoPath())
+	if err != nil {
+		ctx.NotFound(err)
+		return
+	}
+	defer gitRepo.Close()
+
+	branch := repo.DefaultBranch
+	if branch == "" {
+		branch = "main"
+	}
+
+	commit, err := gitRepo.GetBranchCommit(branch)
+	if err != nil {
+		ctx.NotFound(err)
+		return
+	}
+
+	serveRepoFileAsset(ctx, commit, assetPath)
+}
+
 // ServePageAsset serves static assets for the landing page
 func ServePageAsset(ctx *context.Context) {
 	repo, _, err := getRepoFromRequest(ctx)
@@ -535,41 +575,7 @@ func ServePageAsset(ctx *context.Context) {
 		return
 	}
 
-	// Try assets folder first
-	fullPath := path.Join("assets", assetPath)
-	entry, err := commit.GetTreeEntryByPath(fullPath)
-	if err != nil {
-		// Try .gitea/assets
-		fullPath = path.Join(".gitea", "assets", assetPath)
-		entry, err = commit.GetTreeEntryByPath(fullPath)
-		if err != nil {
-			ctx.NotFound(err)
-			return
-		}
-	}
-
-	reader, err := entry.Blob().DataAsync()
-	if err != nil {
-		ctx.ServerError("Failed to read asset", err)
-		return
-	}
-	defer reader.Close()
-
-	// Set content type based on extension
-	ext := path.Ext(assetPath)
-	contentType := getContentType(ext)
-	ctx.Resp.Header().Set("Content-Type", contentType)
-	ctx.Resp.Header().Set("Cache-Control", "public, max-age=3600")
-
-	// Stream content
-	content := make([]byte, entry.Blob().Size())
-	_, err = reader.Read(content)
-	if err != nil && err.Error() != "EOF" {
-		ctx.ServerError("Failed to read asset", err)
-		return
-	}
-
-	_, _ = ctx.Resp.Write(content)
+	serveRepoFileAsset(ctx, commit, assetPath)
 }
 
 // ServeRepoLandingPage serves the landing page for a repository via URL path
@@ -686,17 +692,38 @@ func ServeRepoPageAsset(ctx *context.Context) {
 		return
 	}
 
-	// Try assets folder first
-	fullPath := path.Join("assets", assetPath)
-	entry, err := commit.GetTreeEntryByPath(fullPath)
-	if err != nil {
-		// Try .gitea/assets
-		fullPath = path.Join(".gitea", "assets", assetPath)
+	serveRepoFileAsset(ctx, commit, assetPath)
+}
+
+// serveRepoFileAsset resolves an asset path to a file in the repo and streams it.
+// For paths starting with "gallery/", it maps to .gallery/ in the repo.
+// Otherwise it looks in assets/ then .gitea/assets/.
+func serveRepoFileAsset(ctx *context.Context, commit *git.Commit, assetPath string) {
+	var fullPath string
+	var entry *git.TreeEntry
+	var err error
+
+	if galleryName, found := strings.CutPrefix(assetPath, "gallery/"); found && galleryName != "" {
+		// Serve from .gallery/ folder
+		fullPath = ".gallery/" + galleryName
 		entry, err = commit.GetTreeEntryByPath(fullPath)
 		if err != nil {
 			ctx.NotFound(err)
 			return
 		}
+	} else {
+		// Try assets folder first
+		fullPath = path.Join("assets", assetPath)
+		entry, err = commit.GetTreeEntryByPath(fullPath)
+		if err != nil {
+			// Try .gitea/assets
+			fullPath = path.Join(".gitea", "assets", assetPath)
+			entry, err = commit.GetTreeEntryByPath(fullPath)
+			if err != nil {
+				ctx.NotFound(err)
+				return
+			}
+		}
 	}
 
 	reader, err := entry.Blob().DataAsync()