Update .gitignore to include log files and database journal files. Modify go.mod to update dependencies for go-sqlite3 and cloud.google.com/go/compute/metadata. Enhance Makefile to include logging options for manager and runner commands. Introduce new job token handling in auth package and implement database migration scripts. Refactor manager and runner components to improve job processing and metadata extraction. Add support for video preview in frontend components and enhance WebSocket management for channel subscriptions.

internal/runner/blender/version.go

@@ -0,0 +1,143 @@
+package blender
+
+import (
+	"compress/gzip"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+)
+
+// ParseVersionFromFile parses the Blender version that a .blend file was saved with.
+// Returns major and minor version numbers.
+func ParseVersionFromFile(blendPath string) (major, minor int, err error) {
+	file, err := os.Open(blendPath)
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to open blend file: %w", err)
+	}
+	defer file.Close()
+
+	// Read the first 12 bytes of the blend file header
+	// Format: BLENDER-v<major><minor><patch> or BLENDER_v<major><minor><patch>
+	// The header is: "BLENDER" (7 bytes) + pointer size (1 byte: '-' for 64-bit, '_' for 32-bit)
+	// + endianness (1 byte: 'v' for little-endian, 'V' for big-endian)
+	// + version (3 bytes: e.g., "402" for 4.02)
+	header := make([]byte, 12)
+	n, err := file.Read(header)
+	if err != nil || n < 12 {
+		return 0, 0, fmt.Errorf("failed to read blend file header: %w", err)
+	}
+
+	// Check for BLENDER magic
+	if string(header[:7]) != "BLENDER" {
+		// Might be compressed - try to decompress
+		file.Seek(0, 0)
+		return parseCompressedVersion(file)
+	}
+
+	// Parse version from bytes 9-11 (3 digits)
+	versionStr := string(header[9:12])
+
+	// Version format changed in Blender 3.0
+	// Pre-3.0: "279" = 2.79, "280" = 2.80
+	// 3.0+: "300" = 3.0, "402" = 4.02, "410" = 4.10
+	if len(versionStr) == 3 {
+		// First digit is major version
+		fmt.Sscanf(string(versionStr[0]), "%d", &major)
+		// Next two digits are minor version
+		fmt.Sscanf(versionStr[1:3], "%d", &minor)
+	}
+
+	return major, minor, nil
+}
+
+// parseCompressedVersion handles gzip and zstd compressed blend files.
+func parseCompressedVersion(file *os.File) (major, minor int, err error) {
+	magic := make([]byte, 4)
+	if _, err := file.Read(magic); err != nil {
+		return 0, 0, err
+	}
+	file.Seek(0, 0)
+
+	if magic[0] == 0x1f && magic[1] == 0x8b {
+		// gzip compressed
+		gzReader, err := gzip.NewReader(file)
+		if err != nil {
+			return 0, 0, fmt.Errorf("failed to create gzip reader: %w", err)
+		}
+		defer gzReader.Close()
+
+		header := make([]byte, 12)
+		n, err := gzReader.Read(header)
+		if err != nil || n < 12 {
+			return 0, 0, fmt.Errorf("failed to read compressed blend header: %w", err)
+		}
+
+		if string(header[:7]) != "BLENDER" {
+			return 0, 0, fmt.Errorf("invalid blend file format")
+		}
+
+		versionStr := string(header[9:12])
+		if len(versionStr) == 3 {
+			fmt.Sscanf(string(versionStr[0]), "%d", &major)
+			fmt.Sscanf(versionStr[1:3], "%d", &minor)
+		}
+
+		return major, minor, nil
+	}
+
+	// Check for zstd magic (Blender 3.0+): 0x28 0xB5 0x2F 0xFD
+	if magic[0] == 0x28 && magic[1] == 0xb5 && magic[2] == 0x2f && magic[3] == 0xfd {
+		return parseZstdVersion(file)
+	}
+
+	return 0, 0, fmt.Errorf("unknown blend file format")
+}
+
+// parseZstdVersion handles zstd-compressed blend files (Blender 3.0+).
+// Uses zstd command line tool since Go doesn't have native zstd support.
+func parseZstdVersion(file *os.File) (major, minor int, err error) {
+	file.Seek(0, 0)
+
+	cmd := exec.Command("zstd", "-d", "-c")
+	cmd.Stdin = file
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to create zstd stdout pipe: %w", err)
+	}
+
+	if err := cmd.Start(); err != nil {
+		return 0, 0, fmt.Errorf("failed to start zstd decompression: %w", err)
+	}
+
+	// Read just the header (12 bytes)
+	header := make([]byte, 12)
+	n, readErr := io.ReadFull(stdout, header)
+
+	// Kill the process early - we only need the header
+	cmd.Process.Kill()
+	cmd.Wait()
+
+	if readErr != nil || n < 12 {
+		return 0, 0, fmt.Errorf("failed to read zstd compressed blend header: %v", readErr)
+	}
+
+	if string(header[:7]) != "BLENDER" {
+		return 0, 0, fmt.Errorf("invalid blend file format in zstd archive")
+	}
+
+	versionStr := string(header[9:12])
+	if len(versionStr) == 3 {
+		fmt.Sscanf(string(versionStr[0]), "%d", &major)
+		fmt.Sscanf(versionStr[1:3], "%d", &minor)
+	}
+
+	return major, minor, nil
+}
+
+// VersionString returns a formatted version string like "4.2".
+func VersionString(major, minor int) string {
+	return fmt.Sprintf("%d.%d", major, minor)
+}
+