#!/usr/bin/env python3"""This is a tool to decrypt file names in rclone logs. Pass two files in, the first should be a crypt mapping generated by rclone ls --crypt-show-mapping remote:path The second should be a log file that you want the paths decrypted in. Note that if the crypt mappings file is large it can take some time torun.""" import reimport sys # Crypt linematch_crypt = re.compile(r'NOTICE: (.*?): Encrypts to "(.*?)"$') def read_crypt_map(mapping_file):    """    Read the crypt mapping file in, creating a dictionary of substitutions    """    mapping = {}    with open(mapping_file) as fd:        for line in fd:            match = match_crypt.search(line)            if match:                plaintext, ciphertext = match.groups()                plaintexts = plaintext.split("/")                ciphertexts = ciphertext.split("/")                for plain, cipher in zip(plaintexts, ciphertexts):                    mapping[cipher] = plain    return mapping def map_log_file(crypt_map, log_file):    """    Substitute the crypt_map in the log file.     This uses a straight forward O(N**2) algorithm.  I tried using    regexps to speed it up but it made it slower!    """    with open(log_file) as fd:        for line in fd:            for cipher, plain in crypt_map.items():                line = line.replace(cipher, plain)            sys.stdout.write(line) def main():    if len(sys.argv) < 3:        print("Syntax: %s <crypt-mapping-file> <log-file>" % sys.argv[0])        raise SystemExit(1)    mapping_file, log_file = sys.argv[1:]    crypt_map = read_crypt_map(mapping_file)    map_log_file(crypt_map, log_file) if __name__ == "__main__":    main()