tools_webrtc dir converted to py3 + top level PRESUBMIT script

Bug: webrtc:13607
Change-Id: Ib018e43ea977cc24dd71048e68e3343741f7f31b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249083
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Christoffer Jansson <jansson@google.com>
Cr-Commit-Position: refs/heads/main@{#35953}
diff --git a/tools_webrtc/sslroots/generate_sslroots.py b/tools_webrtc/sslroots/generate_sslroots.py
index ff0052e..2cd0c89 100644
--- a/tools_webrtc/sslroots/generate_sslroots.py
+++ b/tools_webrtc/sslroots/generate_sslroots.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env vpython3
+
 # -*- coding:utf-8 -*-
 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
@@ -17,7 +19,7 @@
       generated file size.
 """
 
-import commands
+import subprocess
 from optparse import OptionParser
 import os
 import re
@@ -39,180 +41,174 @@
 
 
 def main():
-    """The main entrypoint."""
-    parser = OptionParser('usage %prog FILE')
-    parser.add_option('-v', '--verbose', dest='verbose', action='store_true')
-    parser.add_option('-f',
-                      '--full_cert',
-                      dest='full_cert',
-                      action='store_true')
-    options, args = parser.parse_args()
-    if len(args) < 1:
-        parser.error('No crt file specified.')
-        return
-    root_dir = _SplitCrt(args[0], options)
-    _GenCFiles(root_dir, options)
-    _Cleanup(root_dir)
+  """The main entrypoint."""
+  parser = OptionParser('usage %prog FILE')
+  parser.add_option('-v', '--verbose', dest='verbose', action='store_true')
+  parser.add_option('-f', '--full_cert', dest='full_cert', action='store_true')
+  options, args = parser.parse_args()
+  if len(args) < 1:
+    parser.error('No crt file specified.')
+    return
+  root_dir = _SplitCrt(args[0], options)
+  _GenCFiles(root_dir, options)
+  _Cleanup(root_dir)
 
 
 def _SplitCrt(source_file, options):
-    sub_file_blocks = []
-    label_name = ''
-    root_dir = os.path.dirname(os.path.abspath(source_file)) + '/'
-    _PrintOutput(root_dir, options)
-    f = open(source_file)
-    for line in f:
-        if line.startswith('# Label: '):
-            sub_file_blocks.append(line)
-            label = re.search(r'\".*\"', line)
-            temp_label = label.group(0)
-            end = len(temp_label) - 1
-            label_name = _SafeName(temp_label[1:end])
-        elif line.startswith('-----END CERTIFICATE-----'):
-            sub_file_blocks.append(line)
-            new_file_name = root_dir + _PREFIX + label_name + _EXTENSION
-            _PrintOutput('Generating: ' + new_file_name, options)
-            new_file = open(new_file_name, 'w')
-            for out_line in sub_file_blocks:
-                new_file.write(out_line)
-            new_file.close()
-            sub_file_blocks = []
-        else:
-            sub_file_blocks.append(line)
-    f.close()
-    return root_dir
+  sub_file_blocks = []
+  label_name = ''
+  root_dir = os.path.dirname(os.path.abspath(source_file)) + '/'
+  _PrintOutput(root_dir, options)
+  f = open(source_file)
+  for line in f:
+    if line.startswith('# Label: '):
+      sub_file_blocks.append(line)
+      label = re.search(r'\".*\"', line)
+      temp_label = label.group(0)
+      end = len(temp_label) - 1
+      label_name = _SafeName(temp_label[1:end])
+    elif line.startswith('-----END CERTIFICATE-----'):
+      sub_file_blocks.append(line)
+      new_file_name = root_dir + _PREFIX + label_name + _EXTENSION
+      _PrintOutput('Generating: ' + new_file_name, options)
+      new_file = open(new_file_name, 'w')
+      for out_line in sub_file_blocks:
+        new_file.write(out_line)
+      new_file.close()
+      sub_file_blocks = []
+    else:
+      sub_file_blocks.append(line)
+  f.close()
+  return root_dir
 
 
 def _GenCFiles(root_dir, options):
-    output_header_file = open(root_dir + _GENERATED_FILE, 'w')
-    output_header_file.write(_CreateOutputHeader())
-    if options.full_cert:
-        subject_name_list = _CreateArraySectionHeader(_SUBJECT_NAME_VARIABLE,
-                                                      _CHAR_TYPE, options)
-        public_key_list = _CreateArraySectionHeader(_PUBLIC_KEY_VARIABLE,
-                                                    _CHAR_TYPE, options)
-    certificate_list = _CreateArraySectionHeader(_CERTIFICATE_VARIABLE,
-                                                 _CHAR_TYPE, options)
-    certificate_size_list = _CreateArraySectionHeader(
-        _CERTIFICATE_SIZE_VARIABLE, _INT_TYPE, options)
+  output_header_file = open(root_dir + _GENERATED_FILE, 'w')
+  output_header_file.write(_CreateOutputHeader())
+  if options.full_cert:
+    subject_name_list = _CreateArraySectionHeader(_SUBJECT_NAME_VARIABLE,
+                                                  _CHAR_TYPE, options)
+    public_key_list = _CreateArraySectionHeader(_PUBLIC_KEY_VARIABLE,
+                                                _CHAR_TYPE, options)
+  certificate_list = _CreateArraySectionHeader(_CERTIFICATE_VARIABLE,
+                                               _CHAR_TYPE, options)
+  certificate_size_list = _CreateArraySectionHeader(_CERTIFICATE_SIZE_VARIABLE,
+                                                    _INT_TYPE, options)
 
-    for _, _, files in os.walk(root_dir):
-        for current_file in files:
-            if current_file.startswith(_PREFIX):
-                prefix_length = len(_PREFIX)
-                length = len(current_file) - len(_EXTENSION)
-                label = current_file[prefix_length:length]
-                filtered_output, cert_size = _CreateCertSection(
-                    root_dir, current_file, label, options)
-                output_header_file.write(filtered_output + '\n\n\n')
-                if options.full_cert:
-                    subject_name_list += _AddLabelToArray(
-                        label, _SUBJECT_NAME_ARRAY)
-                    public_key_list += _AddLabelToArray(
-                        label, _PUBLIC_KEY_ARRAY)
-                certificate_list += _AddLabelToArray(label, _CERTIFICATE_ARRAY)
-                certificate_size_list += ('  %s,\n') % (cert_size)
+  for _, _, files in os.walk(root_dir):
+    for current_file in files:
+      if current_file.startswith(_PREFIX):
+        prefix_length = len(_PREFIX)
+        length = len(current_file) - len(_EXTENSION)
+        label = current_file[prefix_length:length]
+        filtered_output, cert_size = _CreateCertSection(root_dir, current_file,
+                                                        label, options)
+        output_header_file.write(filtered_output + '\n\n\n')
+        if options.full_cert:
+          subject_name_list += _AddLabelToArray(label, _SUBJECT_NAME_ARRAY)
+          public_key_list += _AddLabelToArray(label, _PUBLIC_KEY_ARRAY)
+        certificate_list += _AddLabelToArray(label, _CERTIFICATE_ARRAY)
+        certificate_size_list += ('  %s,\n') % (cert_size)
 
-    if options.full_cert:
-        subject_name_list += _CreateArraySectionFooter()
-        output_header_file.write(subject_name_list)
-        public_key_list += _CreateArraySectionFooter()
-        output_header_file.write(public_key_list)
-    certificate_list += _CreateArraySectionFooter()
-    output_header_file.write(certificate_list)
-    certificate_size_list += _CreateArraySectionFooter()
-    output_header_file.write(certificate_size_list)
-    output_header_file.write(_CreateOutputFooter())
-    output_header_file.close()
+  if options.full_cert:
+    subject_name_list += _CreateArraySectionFooter()
+    output_header_file.write(subject_name_list)
+    public_key_list += _CreateArraySectionFooter()
+    output_header_file.write(public_key_list)
+  certificate_list += _CreateArraySectionFooter()
+  output_header_file.write(certificate_list)
+  certificate_size_list += _CreateArraySectionFooter()
+  output_header_file.write(certificate_size_list)
+  output_header_file.write(_CreateOutputFooter())
+  output_header_file.close()
 
 
 def _Cleanup(root_dir):
-    for f in os.listdir(root_dir):
-        if f.startswith(_PREFIX):
-            os.remove(root_dir + f)
+  for f in os.listdir(root_dir):
+    if f.startswith(_PREFIX):
+      os.remove(root_dir + f)
 
 
 def _CreateCertSection(root_dir, source_file, label, options):
-    command = 'openssl x509 -in %s%s -noout -C' % (root_dir, source_file)
-    _PrintOutput(command, options)
-    output = commands.getstatusoutput(command)[1]
-    renamed_output = output.replace('unsigned char XXX_',
-                                    'const unsigned char ' + label + '_')
-    filtered_output = ''
-    cert_block = '^const unsigned char.*?};$'
-    prog = re.compile(cert_block, re.IGNORECASE | re.MULTILINE | re.DOTALL)
-    if not options.full_cert:
-        filtered_output = prog.sub('', renamed_output, count=2)
-    else:
-        filtered_output = renamed_output
+  command = 'openssl x509 -in %s%s -noout -C' % (root_dir, source_file)
+  _PrintOutput(command, options)
+  output = subprocess.getstatusoutput(command)[1]
+  renamed_output = output.replace('unsigned char XXX_',
+                                  'const unsigned char ' + label + '_')
+  filtered_output = ''
+  cert_block = '^const unsigned char.*?};$'
+  prog = re.compile(cert_block, re.IGNORECASE | re.MULTILINE | re.DOTALL)
+  if not options.full_cert:
+    filtered_output = prog.sub('', renamed_output, count=2)
+  else:
+    filtered_output = renamed_output
 
-    cert_size_block = r'\d\d\d+'
-    prog2 = re.compile(cert_size_block, re.MULTILINE | re.VERBOSE)
-    result = prog2.findall(renamed_output)
-    cert_size = result[len(result) - 1]
+  cert_size_block = r'\d\d\d+'
+  prog2 = re.compile(cert_size_block, re.MULTILINE | re.VERBOSE)
+  result = prog2.findall(renamed_output)
+  cert_size = result[len(result) - 1]
 
-    return filtered_output, cert_size
+  return filtered_output, cert_size
 
 
 def _CreateOutputHeader():
-    output = (
-        '/*\n'
-        ' *  Copyright 2004 The WebRTC Project Authors. All rights '
-        'reserved.\n'
-        ' *\n'
-        ' *  Use of this source code is governed by a BSD-style license\n'
-        ' *  that can be found in the LICENSE file in the root of the '
-        'source\n'
-        ' *  tree. An additional intellectual property rights grant can be '
-        'found\n'
-        ' *  in the file PATENTS.  All contributing project authors may\n'
-        ' *  be found in the AUTHORS file in the root of the source tree.\n'
-        ' */\n\n'
-        '#ifndef RTC_BASE_SSL_ROOTS_H_\n'
-        '#define RTC_BASE_SSL_ROOTS_H_\n\n'
-        '// This file is the root certificates in C form that are needed to'
-        ' connect to\n// Google.\n\n'
-        '// It was generated with the following command line:\n'
-        '// > python tools_webrtc/sslroots/generate_sslroots.py'
-        '\n//    https://pki.goog/roots.pem\n\n'
-        '// clang-format off\n'
-        '// Don\'t bother formatting generated code,\n'
-        '// also it would breaks subject/issuer lines.\n\n')
-    return output
+  output = ('/*\n'
+            ' *  Copyright 2004 The WebRTC Project Authors. All rights '
+            'reserved.\n'
+            ' *\n'
+            ' *  Use of this source code is governed by a BSD-style license\n'
+            ' *  that can be found in the LICENSE file in the root of the '
+            'source\n'
+            ' *  tree. An additional intellectual property rights grant can be '
+            'found\n'
+            ' *  in the file PATENTS.  All contributing project authors may\n'
+            ' *  be found in the AUTHORS file in the root of the source tree.\n'
+            ' */\n\n'
+            '#ifndef RTC_BASE_SSL_ROOTS_H_\n'
+            '#define RTC_BASE_SSL_ROOTS_H_\n\n'
+            '// This file is the root certificates in C form that are needed to'
+            ' connect to\n// Google.\n\n'
+            '// It was generated with the following command line:\n'
+            '// > vpython3 tools_webrtc/sslroots/generate_sslroots.py'
+            '\n//    https://pki.goog/roots.pem\n\n'
+            '// clang-format off\n'
+            '// Don\'t bother formatting generated code,\n'
+            '// also it would breaks subject/issuer lines.\n\n')
+  return output
 
 
 def _CreateOutputFooter():
-    output = ('// clang-format on\n\n' '#endif  // RTC_BASE_SSL_ROOTS_H_\n')
-    return output
+  output = ('// clang-format on\n\n#endif  // RTC_BASE_SSL_ROOTS_H_\n')
+  return output
 
 
 def _CreateArraySectionHeader(type_name, type_type, options):
-    output = ('const %s kSSLCert%sList[] = {\n') % (type_type, type_name)
-    _PrintOutput(output, options)
-    return output
+  output = ('const %s kSSLCert%sList[] = {\n') % (type_type, type_name)
+  _PrintOutput(output, options)
+  return output
 
 
 def _AddLabelToArray(label, type_name):
-    return ' %s_%s,\n' % (label, type_name)
+  return ' %s_%s,\n' % (label, type_name)
 
 
 def _CreateArraySectionFooter():
-    return '};\n\n'
+  return '};\n\n'
 
 
 def _SafeName(original_file_name):
-    bad_chars = ' -./\\()áéíőú'
-    replacement_chars = ''
-    for _ in bad_chars:
-        replacement_chars += '_'
-    translation_table = string.maketrans(bad_chars, replacement_chars)
-    return original_file_name.translate(translation_table)
+  bad_chars = ' -./\\()áéíőú'
+  replacement_chars = ''
+  for _ in bad_chars:
+    replacement_chars += '_'
+  translation_table = string.maketrans(bad_chars, replacement_chars)
+  return original_file_name.translate(translation_table)
 
 
 def _PrintOutput(output, options):
-    if options.verbose:
-        print output
+  if options.verbose:
+    print(output)
 
 
 if __name__ == '__main__':
-    main()
+  main()