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1#!/usr/bin/env python
2# Copyright 2013 Google Inc. All Rights Reserved.
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16import script_injector
17import unittest
18
19
20LONG_COMMENT = '<!--%s-->' % ('comment,' * 200)
21SCRIPT_TO_INJECT = 'var flag = 0;'
22EXPECTED_SCRIPT = '<script>%s</script>' % SCRIPT_TO_INJECT
23TEXT_HTML = 'text/html'
24TEXT_CSS = 'text/css'
25APPLICATION = 'application/javascript'
26
27TEMPLATE_HEAD = '<!doctype html><html><head>%s</head><body></body></html>'
28TEMPLATE_HTML = '<!doctype html><html>%s<body></body></html>'
29TEMPLATE_DOCTYPE = '<!doctype html>%s<body></body>'
30TEMPLATE_RAW = '%s<body></body>'
31TEMPLATE_COMMENT = '%s<!doctype html>%s<html>%s<head>%s</head></html>'
32
33
34class ScriptInjectorTest(unittest.TestCase):
35
36  def test_unsupported_content_type(self):
37    source = 'abc'
38    # CSS.
39    new_source, already_injected = script_injector.InjectScript(
40        source, TEXT_CSS, SCRIPT_TO_INJECT)
41    self.assertEqual(new_source, source)
42    self.assertFalse(already_injected)
43    # Javascript.
44    new_source, already_injected = script_injector.InjectScript(
45        source, APPLICATION, SCRIPT_TO_INJECT)
46    self.assertEqual(new_source, source)
47    self.assertFalse(already_injected)
48
49  def test_empty_content_as_already_injected(self):
50    source, already_injected = script_injector.InjectScript(
51        '', TEXT_HTML, SCRIPT_TO_INJECT)
52    self.assertEqual(source, '')
53    self.assertTrue(already_injected)
54
55  def test_already_injected(self):
56    source, already_injected = script_injector.InjectScript(
57        TEMPLATE_HEAD % EXPECTED_SCRIPT, TEXT_HTML, SCRIPT_TO_INJECT)
58    self.assertEqual(source, TEMPLATE_HEAD % EXPECTED_SCRIPT)
59    self.assertTrue(already_injected)
60
61  def _assert_successful_injection(self, template):
62    source, already_injected = script_injector.InjectScript(
63        template % '', TEXT_HTML, SCRIPT_TO_INJECT)
64    self.assertEqual(source, template % EXPECTED_SCRIPT)
65    self.assertFalse(already_injected)
66
67  def test_normal(self):
68    self._assert_successful_injection(TEMPLATE_HEAD)
69
70  def test_no_head_tag(self):
71    self._assert_successful_injection(TEMPLATE_HTML)
72
73  def test_no_head_and_html_tag(self):
74    self._assert_successful_injection(TEMPLATE_DOCTYPE)
75
76  def test_no_head_html_and_doctype_tag(self):
77    self._assert_successful_injection(TEMPLATE_RAW)
78
79  def _assert_successful_injection_with_comment(self, before_doctype,
80                                                after_doctype, after_html):
81    source, already_injected = script_injector.InjectScript(
82        TEMPLATE_COMMENT % (before_doctype, after_doctype, after_html, ''),
83        TEXT_HTML, SCRIPT_TO_INJECT)
84    expected_source = TEMPLATE_COMMENT % (before_doctype, after_doctype,
85                                          after_html, EXPECTED_SCRIPT)
86    self.assertEqual(source, expected_source)
87    self.assertFalse(already_injected)
88
89  def test_comment_before_doctype(self):
90    self._assert_successful_injection_with_comment(LONG_COMMENT, '', '')
91
92  def test_comment_after_doctype(self):
93    self._assert_successful_injection_with_comment('', LONG_COMMENT, '')
94
95  def test_comment_after_html(self):
96    self._assert_successful_injection_with_comment('', '', LONG_COMMENT)
97
98  def test_all_comments(self):
99    self._assert_successful_injection_with_comment(
100        LONG_COMMENT, LONG_COMMENT, LONG_COMMENT)
101
102
103if __name__ == '__main__':
104  unittest.main()
105