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      1 # Copyright (c) 2012 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 json
      6 import logging
      7 import urlparse
      8 from sdk_update_common import Error
      9 
     10 SOURCE_WHITELIST = [
     11   'http://localhost/',  # For testing.
     12   'https://commondatastorage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk',
     13 ]
     14 
     15 def IsSourceValid(url):
     16   # E1101: Instance of 'ParseResult' has no 'scheme' member
     17   # pylint: disable=E1101
     18 
     19   given = urlparse.urlparse(url)
     20   for allowed_url in SOURCE_WHITELIST:
     21     allowed = urlparse.urlparse(allowed_url)
     22     if (given.scheme == allowed.scheme and
     23         given.hostname == allowed.hostname and
     24         given.path.startswith(allowed.path)):
     25       return True
     26   return False
     27 
     28 
     29 class Config(dict):
     30   def __init__(self, data=None):
     31     dict.__init__(self)
     32     if data:
     33       self.update(data)
     34     else:
     35       self.sources = []
     36 
     37   def LoadJson(self, json_data):
     38     try:
     39       self.update(json.loads(json_data))
     40     except Exception as e:
     41       raise Error('Error reading json config:\n%s' % str(e))
     42 
     43   def ToJson(self):
     44     try:
     45       return json.dumps(self, sort_keys=False, indent=2)
     46     except Exception as e:
     47       raise Error('Json encoding error writing config:\n%s' % e)
     48 
     49   def __getattr__(self, name):
     50     if name in self:
     51       return self[name]
     52     else:
     53       raise AttributeError('Config does not contain: %s' % name)
     54 
     55   def __setattr__(self, name, value):
     56     self[name] = value
     57 
     58   def AddSource(self, source):
     59     if not IsSourceValid(source):
     60       logging.warn('Only whitelisted sources are allowed. Ignoring \"%s\".' % (
     61           source,))
     62       return
     63 
     64     if source in self.sources:
     65       logging.info('Source \"%s\" already in Config.' % (source,))
     66       return
     67     self.sources.append(source)
     68 
     69   def RemoveSource(self, source):
     70     if source not in self.sources:
     71       logging.warn('Source \"%s\" not in Config.' % (source,))
     72       return
     73     self.sources.remove(source)
     74 
     75   def RemoveAllSources(self):
     76     if not self.sources:
     77       logging.info('No sources to remove.')
     78       return
     79     self.sources = []
     80