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app.py

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+#!/usr/bin/env python3
+"""
+Simple Python wrapper for Apktool to decompile an Android APK file.
+Usage: python decompile_apk.py <path_to_apk> [output_dir]
+Requirements: Apktool must be installed and in PATH.
+Best practices: Use argparse for CLI, handle errors, use pathlib for paths.
+"""
+
+import argparse
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+
+def check_apktool():
+    """Check if Apktool is available in PATH."""
+    try:
+        subprocess.run(['apktool', '--version'], check=True, capture_output=True)
+        return True
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        return False
+
+
+def main():
+    parser = argparse.ArgumentParser(description='Decompile an APK using Apktool.')
+    parser.add_argument('apk_path', type=Path, help='Path to the APK file.')
+    parser.add_argument('output_dir', type=Path, nargs='?', default=None,
+                        help='Output directory (default: basename of APK without extension).')
+    args = parser.parse_args()
+
+    # Validate APK path
+    if not args.apk_path.exists():
+        print(f"Error: APK file '{args.apk_path}' not found.", file=sys.stderr)
+        sys.exit(1)
+
+    if not args.apk_path.suffix == '.apk':
+        print("Error: Input file must be an APK.", file=sys.stderr)
+        sys.exit(1)
+
+    # Set output directory
+    if args.output_dir is None:
+        output_dir = args.apk_path.parent / args.apk_path.stem
+    else:
+        output_dir = args.output_dir
+
+    # Check Apktool availability
+    if not check_apktool():
+        print("Error: Apktool is not installed or not in PATH.", file=sys.stderr)
+        print("Install it from https://ibotpeaches.github.io/Apktool/", file=sys.stderr)
+        sys.exit(1)
+
+    print(f"Decompiling '{args.apk_path}' to '{output_dir}'...")
+
+    # Create output directory
+    output_dir.mkdir(parents=True, exist_ok=True)
+
+    # Run Apktool decode
+    try:
+        subprocess.run(['apktool', 'd', str(args.apk_path), '-o', str(output_dir)],
+                       check=True, capture_output=True)
+        print(f"Decompilation complete. Output in: {output_dir}")
+    except subprocess.CalledProcessError as e:
+        print(f"Error during decompilation: {e.stderr.decode()}", file=sys.stderr)
+        sys.exit(1)
+
+
+if __name__ == '__main__':
+    main()