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      1 # Copyright 2015 The Chromium OS 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 utils
      6 
      7 from autotest_lib.client.common_lib import error
      8 from autotest_lib.client.cros.enterprise import enterprise_policy_base
      9 
     10 
     11 class policy_ImagesAllowedForUrls(enterprise_policy_base.EnterprisePolicyTest):
     12     """Test ImagesAllowedForUrls policy effect on CrOS look & feel.
     13 
     14     This test verifies the behavior of Chrome OS with a range of valid values
     15     for the ImagesAllowedForUrls user policies. These values are covered by
     16     four test cases, named: NotSet_Block, 1Url_Allow, 2Urls_Block, and
     17     3Urls_Allow.
     18 
     19     When the policy value is None (as in case=NotSet_Block), then images are
     20     blocked on any page. When the value is set to a single domain (such as
     21     case=1Url_Allow), images are allowed on any page with that domain. When
     22     set to multiple domains (as in case=2Urls_Block or 3Urls_Allow), then
     23     images are allowed on any page with a domain that matches any of the
     24     listed domains.
     25 
     26     Two test cases (1Url_Allow, 3Urls_Allow) are designed to allow images
     27     to be shown on the test page. The other two test cases (NotSet_Block,
     28     2Urls_Block) are designed to block images on the test page.
     29 
     30     Note this test has a dependency on the DefaultImagesSetting policy, which
     31     is partially tested herein, and by the test policy_ImagesBlockedForUrls.
     32     For this test, we set DefaultImagesSetting=2. This blocks images on all
     33     pages except those with a domain listed in ImagesAllowedForUrls. For the
     34     test policy_ImagesBlockedForUrls, we set DefaultImagesSetting=1. That
     35     allows images to be shown on all pages except those with domains listed in
     36     ImagesBlockedForUrls.
     37 
     38     """
     39     version = 1
     40 
     41     def initialize(self, **kwargs):
     42         self._initialize_test_constants()
     43         super(policy_ImagesAllowedForUrls, self).initialize(**kwargs)
     44         self.start_webserver()
     45 
     46 
     47     def _initialize_test_constants(self):
     48         """Initialize test-specific constants, some from class constants."""
     49         self.POLICY_NAME = 'ImagesAllowedForUrls'
     50         self.TEST_FILE = 'kittens.html'
     51         self.TEST_URL = '%s/%s' % (self.WEB_HOST, self.TEST_FILE)
     52         self.MINIMUM_IMAGE_WIDTH = 640
     53 
     54         self.URL1_DATA = [self.WEB_HOST]
     55         self.URL2_DATA = ['http://www.bing.com', 'https://www.yahoo.com']
     56         self.URL3_DATA = ['http://www.bing.com', self.WEB_HOST,
     57                           'https://www.yahoo.com']
     58         self.TEST_CASES = {
     59             'NotSet_Block': None,
     60             '1Url_Allow': self.URL1_DATA,
     61             '2Urls_Block': self.URL2_DATA,
     62             '3Urls_Allow': self.URL3_DATA
     63         }
     64         self.STARTUP_URLS = ['chrome://policy', 'chrome://settings']
     65         self.SUPPORTING_POLICIES = {
     66             'DefaultImagesSetting': 2,
     67             'BookmarkBarEnabled': False,
     68             'RestoreOnStartupURLs': self.STARTUP_URLS,
     69             'RestoreOnStartup': 4
     70         }
     71 
     72 
     73     def _wait_for_page_ready(self, tab):
     74         utils.poll_for_condition(
     75             lambda: tab.EvaluateJavaScript('pageReady'),
     76             exception=error.TestError('Test page is not ready.'))
     77 
     78 
     79     def _is_image_blocked(self, tab):
     80         image_width = tab.EvaluateJavaScript(
     81             "document.getElementById('kittens_id').naturalWidth")
     82         return image_width < self.MINIMUM_IMAGE_WIDTH
     83 
     84 
     85     def _test_images_allowed_for_urls(self, policy_value):
     86         """Verify CrOS enforces the ImagesAllowedForUrls policy.
     87 
     88         When ImagesAllowedForUrls is undefined, images shall be blocked on
     89         all pages. When ImagesAllowedForUrls contains one or more URLs, images
     90         shall be shown only on the pages whose domain matches any of the
     91         listed domains.
     92 
     93         @param policy_value: policy value for this case.
     94 
     95         """
     96         tab = self.navigate_to_url(self.TEST_URL)
     97         self._wait_for_page_ready(tab)
     98         image_is_blocked = self._is_image_blocked(tab)
     99 
    100         # String |WEB_HOST| shall be found in string |policy_value| for test
    101         # cases 1Url_Allow and 3Urls_Allow, but not for NotSet_Block and
    102         # 2Urls_Block.
    103         if policy_value is not None and self.WEB_HOST in policy_value:
    104             if image_is_blocked:
    105                 raise error.TestFail('Image should not be blocked.')
    106         else:
    107             if not image_is_blocked:
    108                 raise error.TestFail('Image should be blocked.')
    109         tab.Close()
    110 
    111 
    112     def run_test_case(self, case):
    113         """Setup and run the test configured for the specified test case.
    114 
    115         @param case: Name of the test case to run.
    116 
    117         """
    118         case_value = self.TEST_CASES[case]
    119         self.setup_case(self.POLICY_NAME, case_value, self.SUPPORTING_POLICIES)
    120         self._test_images_allowed_for_urls(case_value)
    121