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70 lines
1.8 KiB
Python
70 lines
1.8 KiB
Python
# Copyright 2018 the Deno authors. All rights reserved. MIT license.
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"""
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Computes the SHA256 hash and formats the result.
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"""
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import argparse
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from hashlib import sha256
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import os
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import sys
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def main():
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parser = argparse.ArgumentParser(description=__doc__)
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# Arguments specifying where input comes from.
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# If multiple sources are specified, they are all concatenated together.
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parser.add_argument(
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"--input",
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action="append",
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dest="input",
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type=str,
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metavar="TEXT",
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help="Hash literal text specified on the command line.")
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parser.add_argument(
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"--infile",
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action="append",
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dest="input",
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type=read_file,
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metavar="FILE",
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help="Hash the contents of a file.")
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# Arguments dealing with output.
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parser.add_argument(
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"--format",
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type=str,
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dest="format",
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default="%s",
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metavar="TEMPLATE",
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help="Format output using Python template (default = '%%s').")
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parser.add_argument(
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"--outfile",
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dest="outfile",
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type=argparse.FileType("wb"),
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default=sys.stdout,
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metavar="FILE",
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help="Write the formatted hash to a file (default = stdout).")
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# Parse arguments. Print usage and exit if given no input.
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args = parser.parse_args()
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if (not args.input):
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parser.print_usage()
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return 1
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# Compute the hash of all inputs concatenated together.
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hasher = sha256()
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for data in args.input:
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hasher.update(data)
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hash = hasher.hexdigest()
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# Format and write to specified out file (or the default, stdout).
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args.outfile.write(args.format % hash)
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def read_file(filename):
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with open(filename, "rb") as file:
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return file.read()
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if __name__ == '__main__':
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sys.exit(main())
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