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1#!/usr/bin/env python
2#
3# Copyright 2013 The Chromium Authors. All rights reserved.
4# Use of this source code is governed by a BSD-style license that can be
5# found in the LICENSE file.
6"""Signs and zipaligns APK.
7
8"""
9
10import optparse
11import shutil
12import sys
13import tempfile
14
15from util import build_utils
16
17def RenameInflateAndAddPageAlignment(
18    rezip_apk_jar_path, in_zip_file, out_zip_file):
19  rezip_apk_cmd = [
20      'java',
21      '-classpath',
22      rezip_apk_jar_path,
23      'RezipApk',
24      'renamealign',
25      in_zip_file,
26      out_zip_file,
27    ]
28  build_utils.CheckOutput(rezip_apk_cmd)
29
30
31def ReorderAndAlignApk(rezip_apk_jar_path, in_zip_file, out_zip_file):
32  rezip_apk_cmd = [
33      'java',
34      '-classpath',
35      rezip_apk_jar_path,
36      'RezipApk',
37      'reorder',
38      in_zip_file,
39      out_zip_file,
40    ]
41  build_utils.CheckOutput(rezip_apk_cmd)
42
43
44def JarSigner(key_path, key_name, key_passwd, unsigned_path, signed_path):
45  shutil.copy(unsigned_path, signed_path)
46  sign_cmd = [
47      'jarsigner',
48      '-sigalg', 'MD5withRSA',
49      '-digestalg', 'SHA1',
50      '-keystore', key_path,
51      '-storepass', key_passwd,
52      signed_path,
53      key_name,
54    ]
55  build_utils.CheckOutput(sign_cmd)
56
57
58def AlignApk(zipalign_path, package_align, unaligned_path, final_path):
59  align_cmd = [
60      zipalign_path,
61      '-f'
62      ]
63
64  if package_align:
65    align_cmd += ['-p']
66
67  align_cmd += [
68      '4',  # 4 bytes
69      unaligned_path,
70      final_path,
71      ]
72  build_utils.CheckOutput(align_cmd)
73
74
75def main(args):
76  args = build_utils.ExpandFileArgs(args)
77
78  parser = optparse.OptionParser()
79  build_utils.AddDepfileOption(parser)
80
81  parser.add_option('--rezip-apk-jar-path',
82                    help='Path to the RezipApk jar file.')
83  parser.add_option('--zipalign-path', help='Path to the zipalign tool.')
84  parser.add_option('--page-align-shared-libraries',
85                    action='store_true',
86                    help='Page align shared libraries.')
87  parser.add_option('--unsigned-apk-path', help='Path to input unsigned APK.')
88  parser.add_option('--final-apk-path',
89      help='Path to output signed and aligned APK.')
90  parser.add_option('--key-path', help='Path to keystore for signing.')
91  parser.add_option('--key-passwd', help='Keystore password')
92  parser.add_option('--key-name', help='Keystore name')
93  parser.add_option('--stamp', help='Path to touch on success.')
94  parser.add_option('--load-library-from-zip', type='int',
95      help='If non-zero, build the APK such that the library can be loaded ' +
96           'directly from the zip file using the crazy linker. The library ' +
97           'will be renamed, uncompressed and page aligned.')
98
99  options, _ = parser.parse_args()
100
101  input_paths = [
102    options.unsigned_apk_path,
103    options.key_path,
104  ]
105
106  if options.load_library_from_zip:
107    input_paths.append(options.rezip_apk_jar_path)
108
109  input_strings = [
110    options.load_library_from_zip,
111    options.key_name,
112    options.key_passwd,
113    options.page_align_shared_libraries,
114  ]
115
116  build_utils.CallAndWriteDepfileIfStale(
117      lambda: FinalizeApk(options),
118      options,
119      record_path=options.unsigned_apk_path + '.finalize.md5.stamp',
120      input_paths=input_paths,
121      input_strings=input_strings,
122      output_paths=[options.final_apk_path])
123
124
125def FinalizeApk(options):
126  with tempfile.NamedTemporaryFile() as signed_apk_path_tmp, \
127      tempfile.NamedTemporaryFile() as apk_to_sign_tmp:
128
129    if options.load_library_from_zip:
130      # We alter the name of the library so that the Android Package Manager
131      # does not extract it into a separate file. This must be done before
132      # signing, as the filename is part of the signed manifest. At the same
133      # time we uncompress the library, which is necessary so that it can be
134      # loaded directly from the APK.
135      # Move the library to a page boundary by adding a page alignment file.
136      apk_to_sign = apk_to_sign_tmp.name
137      RenameInflateAndAddPageAlignment(
138          options.rezip_apk_jar_path, options.unsigned_apk_path, apk_to_sign)
139    else:
140      apk_to_sign = options.unsigned_apk_path
141
142    signed_apk_path = signed_apk_path_tmp.name
143    JarSigner(options.key_path, options.key_name, options.key_passwd,
144              apk_to_sign, signed_apk_path)
145
146    if options.load_library_from_zip:
147      # Reorder the contents of the APK. This re-establishes the canonical
148      # order which means the library will be back at its page aligned location.
149      # This step also aligns uncompressed items to 4 bytes.
150      ReorderAndAlignApk(
151          options.rezip_apk_jar_path, signed_apk_path, options.final_apk_path)
152    else:
153      # Align uncompressed items to 4 bytes
154      AlignApk(options.zipalign_path,
155               options.page_align_shared_libraries,
156               signed_apk_path,
157               options.final_apk_path)
158
159
160if __name__ == '__main__':
161  sys.exit(main(sys.argv[1:]))
162