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bin/decrypt_names.py
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Nick Craig-Wood
bin: convert python scripts to python3
07 сен 2019, 00:55
07 сен 2019, 00:55
07dfb3a
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#!/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 to run. """ import re import sys # Crypt line match_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()