1 # Copyright 2013 The Chromium Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import base64 6 import hashlib 7 import os 8 import string 9 import win32api 10 import win32com.client 11 from win32com.shell import shell, shellcon 12 import win32security 13 14 15 def _GetFileVersion(file_path): 16 """Returns the file version of the given file.""" 17 return win32com.client.Dispatch('Scripting.FileSystemObject').GetFileVersion( 18 file_path) 19 20 21 def _GetProductName(file_path): 22 """Returns the product name of the given file. 23 24 Args: 25 file_path: The absolute or relative path to the file. 26 27 Returns: 28 A string representing the product name of the file, or None if the product 29 name was not found. 30 """ 31 language_and_codepage_pairs = win32api.GetFileVersionInfo( 32 file_path, '\\VarFileInfo\\Translation') 33 if not language_and_codepage_pairs: 34 return None 35 product_name_entry = ('\\StringFileInfo\\%04x%04x\\ProductName' % 36 language_and_codepage_pairs[0]) 37 return win32api.GetFileVersionInfo(file_path, product_name_entry) 38 39 40 def _GetUserSpecificRegistrySuffix(): 41 """Returns '.' plus the unpadded Base32 encoding of the MD5 of the user's SID. 42 43 The result must match the output from the method 44 UserSpecificRegistrySuffix::GetSuffix() in 45 chrome/installer/util/shell_util.cc. It will always be 27 characters long. 46 """ 47 token_handle = win32security.OpenProcessToken(win32api.GetCurrentProcess(), 48 win32security.TOKEN_QUERY) 49 user_sid, _ = win32security.GetTokenInformation(token_handle, 50 win32security.TokenUser) 51 user_sid_string = win32security.ConvertSidToStringSid(user_sid) 52 md5_digest = hashlib.md5(user_sid_string).digest() 53 return '.' + base64.b32encode(md5_digest).rstrip('=') 54 55 56 class VariableExpander: 57 """Expands variables in strings.""" 58 59 def __init__(self, mini_installer_path): 60 """Constructor. 61 62 The constructor initializes a variable dictionary that maps variables to 63 their values. These are the only acceptable variables: 64 * $PROGRAM_FILE: the unquoted path to the Program Files folder. 65 * $LOCAL_APPDATA: the unquoted path to the Local Application Data 66 folder. 67 * $MINI_INSTALLER: the unquoted path to the mini_installer. 68 * $MINI_INSTALLER_FILE_VERSION: the file version of the mini_installer. 69 * $CHROME_SHORT_NAME: 'Chrome' (or 'Chromium'). 70 * $CHROME_LONG_NAME: 'Google Chrome' (or 'Chromium'). 71 * $CHROME_DIR: the directory of Chrome (or Chromium) from the base 72 installation directory. 73 * $CHROME_UPDATE_REGISTRY_SUBKEY: the registry key, excluding the root 74 key, of Chrome for Google Update. 75 * $CHROME_HTML_PROG_ID: 'ChromeHTML' (or 'ChromiumHTM'). 76 * $USER_SPECIFIC_REGISTRY_SUFFIX: the output from the function 77 _GetUserSpecificRegistrySuffix(). 78 * $WINDOWS_VERSION: a 2-tuple representing the current Windows version. 79 * $VERSION_[XP/SERVER_2003/VISTA/WIN7/WIN8/WIN8_1]: a 2-tuple 80 representing the version of the corresponding OS. 81 82 Args: 83 mini_installer_path: The path to mini_installer.exe. 84 """ 85 mini_installer_abspath = os.path.abspath(mini_installer_path) 86 mini_installer_file_version = _GetFileVersion(mini_installer_abspath) 87 mini_installer_product_name = _GetProductName(mini_installer_abspath) 88 program_files_path = shell.SHGetFolderPath(0, shellcon.CSIDL_PROGRAM_FILES, 89 None, 0) 90 local_appdata_path = shell.SHGetFolderPath(0, shellcon.CSIDL_LOCAL_APPDATA, 91 None, 0) 92 user_specific_registry_suffix = _GetUserSpecificRegistrySuffix() 93 windows_major_ver, windows_minor_ver, _, _, _ = win32api.GetVersionEx() 94 # This string will be converted to a tuple once injected in eval() through 95 # conditional checks. Tuples are compared lexicographically. 96 windows_version = '(%s, %s)' % (windows_major_ver, windows_minor_ver) 97 if mini_installer_product_name == 'Google Chrome': 98 chrome_short_name = 'Chrome' 99 chrome_long_name = 'Google Chrome' 100 chrome_dir = 'Google\\Chrome' 101 chrome_update_registry_subkey = ('Software\\Google\\Update\\Clients\\' 102 '{8A69D345-D564-463c-AFF1-A69D9E530F96}') 103 chrome_html_prog_id = 'ChromeHTML' 104 elif mini_installer_product_name == 'Chromium': 105 chrome_short_name = 'Chromium' 106 chrome_long_name = 'Chromium' 107 chrome_dir = 'Chromium' 108 chrome_update_registry_subkey = 'Software\\Chromium' 109 chrome_html_prog_id = 'ChromiumHTM' 110 else: 111 raise KeyError("Unknown mini_installer product name '%s'" % 112 mini_installer_product_name) 113 114 self._variable_mapping = { 115 'PROGRAM_FILES': program_files_path, 116 'LOCAL_APPDATA': local_appdata_path, 117 'MINI_INSTALLER': mini_installer_abspath, 118 'MINI_INSTALLER_FILE_VERSION': mini_installer_file_version, 119 'CHROME_SHORT_NAME': chrome_short_name, 120 'CHROME_LONG_NAME': chrome_long_name, 121 'CHROME_DIR': chrome_dir, 122 'CHROME_UPDATE_REGISTRY_SUBKEY': chrome_update_registry_subkey, 123 'CHROME_HTML_PROG_ID': chrome_html_prog_id, 124 'USER_SPECIFIC_REGISTRY_SUFFIX': user_specific_registry_suffix, 125 'WINDOWS_VERSION': windows_version, 126 'VERSION_XP': '(5, 1)', 127 'VERSION_SERVER_2003': '(5, 2)', 128 'VERSION_VISTA': '(6, 0)', 129 'VERSION_WIN7': '(6, 1)', 130 'VERSION_WIN8': '(6, 2)', 131 'VERSION_WIN8_1': '(6, 3)', 132 } 133 134 def Expand(self, str): 135 """Expands variables in the given string. 136 137 This method resolves only variables defined in the constructor. It does not 138 resolve environment variables. Any dollar signs that are not part of 139 variables must be escaped with $$, otherwise a KeyError or a ValueError will 140 be raised. 141 142 Args: 143 str: A string. 144 145 Returns: 146 A new string created by replacing variables with their values. 147 """ 148 return string.Template(str).substitute(self._variable_mapping) 149
