#!/usr/bin/env python3

#   cryptomator-utils: Python utilities for inspecting Cryptomator drives
#   Copyright (C) 2024  Lee Yingtong Li (RunasSudo)
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU Affero General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU Affero General Public License for more details.
#
#   You should have received a copy of the GNU Affero General Public License
#   along with this program.  If not, see <https://www.gnu.org/licenses/>.

from lib_cryptomator_utils.cryptomator import encrypt_filename, hash_directory_id, list_directory, load_vault_config

import os
import sys

def main():
	if len(sys.argv) < 3:
		print('Usage: {} /path/to/vault.cryptomator /plaintext/path/within/drive'.format(sys.argv[0]))
		sys.exit(1)
	
	# Parse CLI arguments
	vault_config_path = sys.argv[1]
	target_directory = sys.argv[2]
	
	vault_path = os.path.split(vault_config_path)[0]
	
	# Load vault config (asks for password)
	primary_master_key, hmac_master_key = load_vault_config(vault_config_path)
	
	target_directory_parts = target_directory.strip('/').split('/')
	
	# Begin in root directory
	# The root directory in Cryptomator has an empty directory ID
	directory_id = ''
	
	# Traverse path
	for path_part in target_directory_parts:
		if not path_part:
			continue
		
		# Hash the current directory ID
		hashed_directory_id = hash_directory_id(primary_master_key, hmac_master_key, directory_id)
		
		# Look up the encrypted path_part in the current directory
		encrypted_filename = encrypt_filename(primary_master_key, hmac_master_key, directory_id, path_part)
		
		# Get the directory ID of the part_path
		subdirectory_dir_file = os.path.join(vault_path, 'd', hashed_directory_id[:2], hashed_directory_id[2:], encrypted_filename, 'dir.c9r')
		with open(subdirectory_dir_file, 'r') as f:
			new_directory_id = f.read()
		
		# Traverse to the new directory ID
		directory_id = new_directory_id
	
	# Now we have reached the requested directory, so print directory listing
	for filename in sorted(list_directory(vault_path, primary_master_key, hmac_master_key, directory_id)):
		print(filename)

if __name__ == '__main__':
	main()