bluetooth: Added script for converting the Web Bluetooth blacklist.

tools/web_bluetooth/compact_blacklist.py

Index: tools/web_bluetooth/compact_blacklist.py
diff --git a/tools/web_bluetooth/compact_blacklist.py b/tools/web_bluetooth/compact_blacklist.py
new file mode 100755
index 0000000000000000000000000000000000000000..dae783f77a51ce3676c0a08e7bc363d3690a93bf
--- /dev/null
+++ b/tools/web_bluetooth/compact_blacklist.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Script for converting the Web Bluetooth GATT blacklist into the format
+expected by ContentBrowserClient#GetWebBluetoothBlacklist.
+
+See:
+https://github.com/WebBluetoothCG/registries/blob/master/gatt_blacklist.txt
+content/public/browser/content_browser_client.h
+
+Usage:
+  compact_blacklist.py <gatt_blacklist.txt>
+"""
+
+import collections
+import string
+import sys
+
+UUID_LENGTH = 36
+UUID_BASE_POSTFIX = '-0000-1000-8000-00805f9b34fb'
+
+
+class BadLineException(Exception):
+  pass
+
+
+class InvalidUUIDException(Exception):
+  pass
+
+
+class DuplicateUUIDException(Exception):
+  pass
+
+
+class InvalidExclusionException(Exception):
+  pass
+
+
+def ValidUUID(uuid):
+  if len(uuid) != UUID_LENGTH:
+    return False
+  for i in range(UUID_LENGTH):
+    if i in [8, 13, 18, 23]:
+      if uuid[i] != '-':
+        return False
+    else:
+      if uuid[i] not in string.hexdigits:
+        return False
+  return True
+
+
+
+
+def ShortenUUID(uuid):
+  """Shorten a UUUD that use Bluetooth base UUID.
+
+  Note: this function shortens all UUIDs that use the Bluetooth base
+  UUID even though the specification states that only an assigned UUID
+  can be shortened. In this case it works fine, since the constructor in
+  bluetooth_uuid.cc also works the same way.
+  """
+
+  if uuid[8:] == UUID_BASE_POSTFIX:
+    new_uuid = '%x' % int(uuid[:8], 16)
+    if len(new_uuid) in [4, 8]:
+      uuid = new_uuid
+  return uuid
+
+
+def Process(line, blacklist):
+  line = line.strip().lower()
+  if not line or line.startswith('#'):
+    return
+  fields = line.split()
+  if len(fields) not in [1, 2]:
+    raise BadLineException('Badly formatted line: %s' % line)
+  uuid = fields[0]
+  if not ValidUUID(uuid):
+    raise InvalidUUIDException('Invalid UUID: %s' % line)
+  uuid = ShortenUUID(uuid)
+  if uuid in blacklist:
+    raise DuplicateUUIDException('Duplicate UUID: %s' % line)
+  if len(fields) == 1:
+    blacklist[uuid] = 'e'
+  elif fields[1] == 'exclude-writes':
+    blacklist[uuid] = 'w'
+  elif fields[1] == 'exclude-reads':
+    blacklist[uuid] = 'r'
+  else:
+    raise InvalidExclusionException('Invalid exclusion value: %s' % line)
+
+
+def main():
+  if len(sys.argv) != 2:
+    print('Usage: %s <gatt_blacklist.txt>' % sys.argv[0])
+    return 1
+
+  try:
+    blacklist = collections.OrderedDict()
+    with open(sys.argv[1]) as f:
+      for line in f:
+        Process(line, blacklist)
+    print(','.join('%s:%s' % (uuid, blacklist[uuid]) for uuid in blacklist))
+    return 0
+  except Exception as e:
+    print('Failed to compact blacklist. %s' % e)
+    return 1
+
+
+if __name__ == '__main__':
+  sys.exit(main())