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