Bundle Puppeteer Dependency

internal/dependencies.go

@@ -0,0 +1,104 @@
+package internal
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"crypto/sha256"
+	_ "embed"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+//go:embed assets/node_modules.tar.gz
+var embeddedNodeModules []byte
+
+// ensureEmbeddedNodeModules extracts the bundled Node.js dependencies into a
+// deterministic cache directory derived from the archive hash and returns the
+// path that contains the resulting node_modules directory.
+func ensureEmbeddedNodeModules() (string, error) {
+	if len(embeddedNodeModules) == 0 {
+		return "", errors.New("no embedded node modules archive available")
+	}
+
+	sum := sha256.Sum256(embeddedNodeModules)
+	hashPrefix := hex.EncodeToString(sum[:8])
+
+	cacheRoot, err := os.UserCacheDir()
+	if err != nil {
+		cacheRoot = os.TempDir()
+	}
+	baseDir := filepath.Join(cacheRoot, "streamed-tui", "node_modules", hashPrefix)
+
+	marker := filepath.Join(baseDir, ".complete")
+	if _, err := os.Stat(marker); err == nil {
+		return baseDir, nil
+	}
+
+	if err := os.RemoveAll(baseDir); err != nil {
+		return "", fmt.Errorf("failed to clear embedded node cache: %w", err)
+	}
+	if err := os.MkdirAll(baseDir, 0o755); err != nil {
+		return "", fmt.Errorf("failed to create embedded node cache: %w", err)
+	}
+
+	if err := untarGzip(bytes.NewReader(embeddedNodeModules), baseDir); err != nil {
+		return "", fmt.Errorf("failed to extract embedded node modules: %w", err)
+	}
+
+	if err := os.WriteFile(marker, []byte(time.Now().Format(time.RFC3339)), 0o644); err != nil {
+		return "", fmt.Errorf("failed to mark embedded node modules ready: %w", err)
+	}
+
+	return baseDir, nil
+}
+
+func untarGzip(r io.Reader, dest string) error {
+	gz, err := gzip.NewReader(r)
+	if err != nil {
+		return err
+	}
+	defer gz.Close()
+
+	tr := tar.NewReader(gz)
+	for {
+		hdr, err := tr.Next()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		target := filepath.Join(dest, hdr.Name)
+		switch hdr.Typeflag {
+		case tar.TypeDir:
+			if err := os.MkdirAll(target, os.FileMode(hdr.Mode)); err != nil {
+				return err
+			}
+		case tar.TypeReg:
+			if err := os.MkdirAll(filepath.Dir(target), 0o755); err != nil {
+				return err
+			}
+			f, err := os.OpenFile(target, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(hdr.Mode))
+			if err != nil {
+				return err
+			}
+			if _, err := io.Copy(f, tr); err != nil {
+				f.Close()
+				return err
+			}
+			if err := f.Close(); err != nil {
+				return err
+			}
+		default:
+			// Ignore unsupported entries to keep extraction simple.
+		}
+	}
+	return nil
+}