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#!/usr/bin/env python
# Copyright (C) 2020 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" Writes a TypeScript dict that contains SHA256s of the passed files.
The output looks like this:
{
hex_digest: '6c761701c5840483833ffb0bd70ae155b2b3c70e8f667c7bd1f6abc98095930',
files: {
'frontend_bundle.js': 'sha256-2IVKK/3mEMlDdXNADyK03L1cANKbBpU+xue+vnLOcyo=',
'index.html': 'sha256-ZRS1+Xh/dFZeWZi/dz8QMWg/8PYQHNdazsNX2oX8s70=',
...
}
}
"""
from __future__ import print_function
import argparse
import base64
import hashlib
import os
import sys
from base64 import b64encode
def hash_file(file_path):
hasher = hashlib.sha256()
with open(file_path, 'rb') as f:
for chunk in iter(lambda: f.read(32768), b''):
hasher.update(chunk)
return file_path, hasher.digest()
def hash_list_hex(args):
hasher = hashlib.sha256()
for arg in args:
hasher.update(arg)
return hasher.hexdigest()
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--out', help='Path of the output file')
parser.add_argument(
'--strip', help='Strips the leading path in the generated file list')
parser.add_argument('file_list', nargs=argparse.REMAINDER)
args = parser.parse_args()
# Compute the hash of each file.
digests = dict(map(hash_file, args.file_list))
contents = '// __generated_by %s\n' % __file__
contents += 'export const UI_DIST_MAP = {\n'
contents += ' files: {\n'
strip = args.strip + ('' if args.strip[-1] == os.path.sep else os.path.sep)
for fname, digest in digests.items():
if not fname.startswith(strip):
raise Exception('%s must start with %s (--strip arg)' % (fname, strip))
fname = fname[len(strip):]
# We use b64 instead of hexdigest() because it's handy for handling fetch()
# subresource integrity.
contents += ' \'%s\': \'sha256-%s\',\n' % (fname, b64encode(digest))
contents += ' },\n'
# Compute the hash of the all resources' hashes.
contents += ' hex_digest: \'%s\',\n' % hash_list_hex(digests.values())
contents += '};\n'
with open(args.out + '.tmp', 'w') as fout:
fout.write(contents)
os.rename(args.out + '.tmp', args.out)
if __name__ == '__main__':
sys.exit(main())
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