feat: add asset generation command

cmd/genassets/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/mhsanaei/3x-ui/v2/web/assetsgen"
+)
+
+func main() {
+	const (
+		sourceDir    = "web/assets"
+		outputDir    = "web/public/assets"
+		manifestPath = "web/public/assets-manifest.json"
+	)
+
+	if err := os.RemoveAll(outputDir); err != nil {
+		log.Fatalf("remove stale asset output: %v", err)
+	}
+	if err := os.Remove(manifestPath); err != nil && !os.IsNotExist(err) {
+		log.Fatalf("remove stale asset manifest: %v", err)
+	}
+
+	manifest, err := assetsgen.Generate(assetsgen.Options{
+		SourceDir: sourceDir,
+		OutputDir: outputDir,
+		HashLen:   8,
+	})
+	if err != nil {
+		log.Fatalf("generate fingerprinted assets: %v", err)
+	}
+
+	if err := assetsgen.WriteManifest(filepath.Clean(manifestPath), manifest); err != nil {
+		log.Fatalf("write asset manifest: %v", err)
+	}
+}

web/assetsgen/generator_test.go

@@ -91,6 +91,38 @@ func TestGenerateClampsHashLenToSha256HexLength(t *testing.T) {
 	}
 }
 
+func TestGeneratePreservesNestedDirectories(t *testing.T) {
+	src := t.TempDir()
+	dst := t.TempDir()
+
+	if err := os.MkdirAll(filepath.Join(src, "css"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(src, "css", "custom.min.css"), []byte("body{}\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	manifest, err := Generate(Options{
+		SourceDir: src,
+		OutputDir: filepath.Join(dst, "assets"),
+		HashLen:   8,
+	})
+	if err != nil {
+		t.Fatalf("Generate returned error: %v", err)
+	}
+
+	got := manifest["css/custom.min.css"]
+	if got == "" {
+		t.Fatalf("missing css/custom.min.css entry: %#v", manifest)
+	}
+	if filepath.Dir(got) != "css" {
+		t.Fatalf("expected nested output directory, got %q", got)
+	}
+	if filepath.Ext(got) != ".css" {
+		t.Fatalf("expected css extension, got %q", got)
+	}
+}
+
 func TestGenerateFingerprintsDotfilesWithoutLeadingExtension(t *testing.T) {
 	src := t.TempDir()
 	dst := t.TempDir()

web/public/.gitkeep

@@ -0,0 +1 @@
+

web/public/README.md

@@ -0,0 +1,12 @@
+# Generated frontend assets
+
+This directory is generated from `web/assets` by:
+
+- `go run ./cmd/genassets`
+
+Contents:
+
+- `assets/`: fingerprinted files for production embedding
+- `assets-manifest.json`: logical-to-fingerprinted path mapping
+
+Do not edit generated files by hand.