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htmlutils_unit_tests.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Unit tests for htmlutils library."""
__revision__ = "$Id$"
import unittest
from invenio.htmlutils import HTMLWasher, nmtoken_from_string, \
remove_html_markup, create_html_select, \
CFG_TIDY_INSTALLED, \
CFG_BEAUTIFULSOUP_INSTALLED, tidy_html, \
escape_javascript_string
from invenio.testutils import make_test_suite, run_test_suite
class XSSEscapingTest(unittest.TestCase):
"""Test functions related to the prevention of XSS attacks."""
def __init__(self, methodName='test'):
self.washer = HTMLWasher()
unittest.TestCase.__init__(self, methodName)
def test_forbidden_formatting_tags(self):
"""htmlutils - washing of tags altering formatting of a page (e.g. </html>)"""
test_str = """</html></body></pre>"""
self.assertEqual(self.washer.wash(html_buffer=test_str),
'')
self.assertEqual(self.washer.wash(html_buffer=test_str,
render_unallowed_tags=True),
'&lt;/html&gt;&lt;/body&gt;&lt;/pre&gt;')
def test_forbidden_script_tags(self):
"""htmlutils - washing of tags defining scripts (e.g. <script>)"""
test_str = """<script>malicious_function();</script>"""
self.assertEqual(self.washer.wash(html_buffer=test_str),
'')
self.assertEqual(self.washer.wash(html_buffer=test_str,
render_unallowed_tags=True),
'&lt;script&gt;malicious_function();&lt;/script&gt;')
def test_forbidden_attributes(self):
"""htmlutils - washing of forbidden attributes in allowed tags (e.g. onLoad)"""
# onload
test_str = """<p onload="javascript:malicious_functtion();">"""
self.assertEqual(self.washer.wash(html_buffer=test_str), '<p>')
# tricky: css calling a javascript
test_str = """<p style="background: url('http://malicious_site.com/malicious_script.js');">"""
self.assertEqual(self.washer.wash(html_buffer=test_str), '<p>')
def test_fake_url(self):
"""htmlutils - washing of fake URLs which execute scripts"""
test_str = """<a href="javascript:malicious_function();">link</a>"""
self.assertEqual(self.washer.wash(html_buffer=test_str),
'<a href="">link</a>')
# Pirates could encode ascii values, or use uppercase letters...
test_str = """<a href="&#106;a&#118;asCRi&#112;t:malicious_function();">link</a>"""
self.assertEqual(self.washer.wash(html_buffer=test_str),
'<a href="">link</a>')
# MSIE treats 'java\ns\ncript:' the same way as 'javascript:'
# Here we test with:
# j
# avas
# crIPt :
test_str = """<a href="&#106;\n a&#118;as\n crI&#80;t :malicious_function();">link</a>"""
self.assertEqual(self.washer.wash(html_buffer=test_str),
'<a href="">link</a>')
class CharactersEscapingTest(unittest.TestCase):
"""Test functions related to escaping reserved or forbidden characters """
def test_convert_string_to_nmtoken(self):
"""htmlutils - converting string to Nmtoken"""
# TODO: possibly extend this test to include 'extenders' and
# 'combining characters' as defined in
# http://www.w3.org/TR/2000/REC-xml-20001006#NT-Nmtoken
ascii_str = "".join([chr(i) for i in range(0, 256)])
nmtoken = nmtoken_from_string(ascii_str)
for char in nmtoken:
self.assert_(char in ['.', '-', '_', ':'] or char.isalnum())
class JavascriptCharactersEscapingTest(unittest.TestCase):
"""Test functions related to escaping Javascript characters for use in various context """
def test_newline(self):
"""htmlutils - test if newlines are properly escaped for Javascript strings"""
test_str = "a string with a \n line break in it"
self.assertEqual(escape_javascript_string(test_str), "a string with a \\n line break in it")
test_str = "a string with a \r\n line break in it"
self.assertEqual(escape_javascript_string(test_str), "a string with a \\r\\n line break in it")
test_str = """a string with a \r\n line break and "quote" in it"""
self.assertEqual(escape_javascript_string(test_str), '''a string with a \\r\\n line break and \\"quote\\" in it''')
def test_newline_nojson(self):
"""htmlutils - test if newlines are properly escaped for Javascript strings without JSON module. """
# Trick jsonutils into thinking json module is not available.
import invenio.htmlutils
invenio.htmlutils.CFG_JSON_AVAILABLE = False
self.test_newline()
invenio.htmlutils.CFG_JSON_AVAILABLE = True
def test_escape_javascript_string_for_html(self):
"""htmlutils - escaping strings for Javascript, for use in HTML"""
self.assertEqual(escape_javascript_string('''"Are you a Munchkin?" asked Dorothy.
"No, but I am their friend"'''),
'\\"Are you a Munchkin?\\" asked Dorothy.\\n\\"No, but I am their friend\\"')
input_string = '''/*<![CDATA[*/"Your <em>'Silver Shoes'</em> will carry you over the desert,"\r replied Glinda./*]]>*/'''
output_string = """/*&lt;![CDATA[*/\\"Your &lt;em&gt;\\'Silver Shoes\\'&lt;/em&gt; will carry you over the desert,\\"\\r replied Glinda./*]]&gt;*/"""
self.assertEqual(escape_javascript_string(input_string), output_string)
def test_escape_javascript_string_for_html_nojson(self):
"""htmlutils - escaping strings for Javascript, for use in HTML, without JSON module."""
# Same output if we did not have JSON installed
import invenio.htmlutils
invenio.htmlutils.CFG_JSON_AVAILABLE = False
self.test_escape_javascript_string_for_html()
invenio.htmlutils.CFG_JSON_AVAILABLE = True
def test_escape_javascript_string_for_html_in_cdata(self):
"""htmlutils - escaping strings for Javascript, for use in HTML, in CDATA sections"""
input_string = '''/*<![CDATA[*/"Your <em>'Silver Shoes'</em> will carry you over the desert,"\r replied Glinda./*]]>*/'''
output_string = """/*<![CDATA[*/\\"Your <em>\\'Silver Shoes\\'</em> will carry you over the desert,\\"\\r replied Glinda./*]]]]><![CDATA[>*/"""
self.assertEqual(escape_javascript_string(input_string, escape_for_html=False, escape_CDATA=True),
output_string)
def test_escape_javascript_string_for_html_in_cdata_nojson(self):
"""htmlutils - escaping strings for Javascript, for use in HTML, in CDATA sections, without JSON module."""
import invenio.htmlutils
invenio.htmlutils.CFG_JSON_AVAILABLE = False
self.test_escape_javascript_string_for_html_in_cdata()
invenio.htmlutils.CFG_JSON_AVAILABLE = True
def test_escape_javascript_string_for_javascript_or_json(self):
"""htmlutils - escaping strings for Javascript, for use in "pure" Javscript or JSON output"""
input_string = '''/*<![CDATA[*/"Your <em>'Silver Shoes'</em> will carry you over the desert,"\r replied Glinda./*]]>*/'''
output_string = """/*<![CDATA[*/\\"Your <em>\\'Silver Shoes\\'</em> will carry you over the desert,\\"\\r replied Glinda./*]]>*/"""
self.assertEqual(escape_javascript_string(input_string, escape_for_html=False, escape_CDATA=False),
output_string)
def test_escape_javascript_string_for_javascript_or_json_nojson(self):
"""htmlutils - escaping strings for Javascript, for use in "pure" Javscript or JSON output, without JSON module."""
import invenio.htmlutils
invenio.htmlutils.CFG_JSON_AVAILABLE = False
self.test_escape_javascript_string_for_javascript_or_json()
invenio.htmlutils.CFG_JSON_AVAILABLE = True
def test_escape_closing_script_tag(self):
"""htmlutils - escaping closing </script> tag"""
input_string = '''My string contain some<script>alert(foo)</script> that browser might not like'''
output_string = '''My string contain some<script>alert(foo)</scr'+'ipt> that browser might not like'''
self.assertEqual(escape_javascript_string(input_string,
escape_for_html=False,
escape_CDATA=False,
escape_script_tag_with_quote="'"),
output_string)
output_string = '''My string contain some<script>alert(foo)</scr"+"ipt> that browser might not like'''
self.assertEqual(escape_javascript_string(input_string,
escape_for_html=False,
escape_CDATA=False,
escape_script_tag_with_quote='"'),
output_string)
def test_escape_javascript_string_for_html_in_tag_attribute(self):
"""htmlutils - escaping closing double quotes for use in HTML tag attribute"""
input_string = '''"Your <em>'Silver Shoes'</em> will carry you over the desert,"\r replied Glinda.'''
output_string = """&quot;Your <em>\\'Silver Shoes\\'</em> will carry you over the desert,&quot;\\r replied Glinda."""
self.assertEqual(escape_javascript_string(input_string, escape_for_html=False, escape_quote_for_html=True),
output_string)
class HTMLWashingTest(unittest.TestCase):
"""Test functions related to general washing of HTML source"""
def __init__(self, methodName='test'):
self.washer = HTMLWasher()
unittest.TestCase.__init__(self, methodName)
def test_wash_html(self):
"""htmlutils - washing HTML tags"""
# Simple test case
test_str = 'Spam and <b><blink>eggs</blink></b>'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'Spam and <b>eggs</b>')
# Show 'escaped' tags
test_str = 'Spam and <b><blink>eggs</blink></b>'
self.assertEqual(self.washer.wash(html_buffer=test_str,
render_unallowed_tags=True),
'Spam and <b>&lt;blink&gt;eggs&lt;/blink&gt;</b>')
# Keep entity and character references
test_str = '<b> a &lt; b &gt; c </b> &#247;'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'<b> a &lt; b &gt; c </b> &#247;')
# Remove content of <script> tags
test_str = '<script type="text/javacript">alert("foo")</script>bar'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'bar')
test_str = '<script type="text/javacript"><!--alert("foo")--></script>bar'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'bar')
# Remove content of <style> tags
test_str = '<style>.myclass {color:#f00}</style><span class="myclass">styled text</span>'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'styled text')
test_str = '<style><!-- .myclass {color:#f00} --></style><span class="myclass">styled text</span>'
self.assertEqual(self.washer.wash(html_buffer=test_str),
'styled text')
class HTMLTidyingTest(unittest.TestCase):
"""Test functions related to tidying up HTML source"""
html_buffer_1 = 'test</blockquote >'
html_buffer_2 = '<blockquote >test </div><div>test2'
html_buffer_3 = '''<UL>
<LI>
<UL>
<LI><A HREF="rememberwhenb.html">Next</A>
<LI><A HREF="daysofourlives.html">Back</A>
<LI><A HREF="newstuff.html">New Stuff</A>
</UL>
</UL>
<UL>
<LI>Merge adjacent lists
</UL>
<UL>
<UL>
<LI><A HREF="one.html">One</A>
<LI><A HREF="two.html">Two</A>
<LI><A HREF="three.html">Three</A>
</UL>''' # Input test 427841 from Tidy
if CFG_TIDY_INSTALLED:
def test_tidy_html_with_utidylib(self):
"""htmlutils - Tidying up HTML with µTidylib """
res1 = tidy_html(self.html_buffer_1, 'utidylib')
res2 = tidy_html(self.html_buffer_2, 'utidylib')
res3 = tidy_html(self.html_buffer_3, 'utidylib')
self.assertEqual(res1.replace('\n', '').replace(' ', ''),
'test')
self.assertEqual(res2.replace('\n', '').replace(' ', ''),
'<blockquote>test<div>test2</div></blockquote>')
self.assertEqual(res3.replace('\n', '').replace(' ', ''),
'<ul><li><ul><li><ahref="rememberwhenb.html">Next</a></li><li><ahref="daysofourlives.html">Back</a></li><li><ahref="newstuff.html">NewStuff</a></li></ul></li></ul><ul><li>Mergeadjacentlists</li></ul><divstyle="margin-left:2em"><ul><li><ahref="one.html">One</a></li><li><ahref="two.html">Two</a></li><li><ahref="three.html">Three</a></li></ul></div>')
if CFG_BEAUTIFULSOUP_INSTALLED:
def test_tidy_html_with_beautifulsoup(self):
"""htmlutils - Tidying up HTML with BeautifulSoup"""
res1 = tidy_html(self.html_buffer_1, 'beautifulsoup')
res2 = tidy_html(self.html_buffer_2, 'beautifulsoup')
res3 = tidy_html(self.html_buffer_3, 'beautifulsoup')
self.assertEqual(res1.replace('\n', '').replace(' ', ''),
'test')
self.assertEqual(res2.replace('\n', '').replace(' ', ''),
'<blockquote>test<div>test2</div></blockquote>')
self.assertEqual(res3.replace('\n', '').replace(' ', ''),
'<ul><li><ul><li><ahref="rememberwhenb.html">Next</a></li><li><ahref="daysofourlives.html">Back</a></li><li><ahref="newstuff.html">NewStuff</a></li></ul></li></ul><ul><li>Mergeadjacentlists</li></ul><ul><ul><li><ahref="one.html">One</a></li><li><ahref="two.html">Two</a></li><li><ahref="three.html">Three</a></li></ul></ul>')
def test_tidy_html_with_unknown_lib(self):
"""htmlutils - Tidying up HTML with non existing library"""
res = tidy_html(self.html_buffer_1, 'foo')
self.assertEqual(res.replace('\n', '').replace(' ', ''),
self.html_buffer_1.replace('\n', '').replace(' ', ''))
class HTMLMarkupRemovalTest(unittest.TestCase):
"""Test functions related to removing HTML markup."""
def test_remove_html_markup_empty(self):
"""htmlutils - remove HTML markup, empty replacement"""
test_input = 'This is <a href="test">test</a>.'
test_expected = 'This is test.'
self.assertEqual(remove_html_markup(test_input, ''),
test_expected)
def test_remove_html_markup_replacement(self):
"""htmlutils - remove HTML markup, some replacement"""
test_input = 'This is <a href="test">test</a>.'
test_expected = 'This is XtestX.'
self.assertEqual(remove_html_markup(test_input, 'X'),
test_expected)
class HTMLAutomaticLinksTransformation(unittest.TestCase):
"""Test functions related to transforming links into HTML context"""
def __init__(self, methodName='test'):
self.washer = HTMLWasher()
unittest.TestCase.__init__(self, methodName)
def test_transform_link(self):
"""htmlutils - transforming a link"""
body_input = 'https://cds.cern.ch/collection/Multimedia%20%26%20Outreach?ln=es'
body_expected = '<a href="https://cds.cern.ch/collection/Multimedia%20%26%20Outreach?ln=es">https://cds.cern.ch/collection/Multimedia%20%26%20Outreach?ln=es</a>'
self.assertEqual(self.washer.wash(html_buffer=body_input,
automatic_link_transformation=True),
body_expected)
def test_transform_several_links(self):
"""htmlutils - transforming several links"""
body_input = 'some text https://cds.cern.ch/collection/Videos?ln=es more text https://cds.cern.ch/search?p=%27CERN+News'
body_expected = 'some text <a href="https://cds.cern.ch/collection/Videos?ln=es">https://cds.cern.ch/collection/Videos?ln=es</a> more text <a href="https://cds.cern.ch/search?p=%27CERN">https://cds.cern.ch/search?p=%27CERN</a>+News'
self.assertEqual(self.washer.wash(html_buffer=body_input,
automatic_link_transformation=True),
body_expected)
def test_transform_just_valid_links(self):
"""htmlutils - transforming just valid links"""
body_input = body_input = 'some text https://cds.cern.ch/collection/Videos?ln=es more text https://cds..cern/search?p=%27CERN+News'
body_expected = 'some text <a href="https://cds.cern.ch/collection/Videos?ln=es">https://cds.cern.ch/collection/Videos?ln=es</a> more text https://cds..cern/search?p=%27CERN+News'
self.assertEqual(self.washer.wash(html_buffer=body_input,
automatic_link_transformation=True),
body_expected)
def test_not_transform_link(self):
"""htmlutils - not transforming a link"""
body_input = '<a href="https://cds.cern.ch/collection/Multimedia%20%26%20Outreach?ln=es">Multimedia</a>'
body_expected = '<a href="https://cds.cern.ch/collection/Multimedia%20%26%20Outreach?ln=es">Multimedia</a>'
self.assertEqual(self.washer.wash(html_buffer=body_input,
automatic_link_transformation=True),
body_expected)
class HTMLCreation(unittest.TestCase):
"""Test functions related to creation of HTML markup."""
def test_create_html_select(self):
"""htmlutils - create HTML <select> list """
self.assertEqual(create_html_select(["foo", "bar"], selected="bar", name="baz"),
'<select name="baz"><option value="foo">foo</option>\n<option selected="selected" value="bar">bar</option></select>')
TEST_SUITE = make_test_suite(XSSEscapingTest,
CharactersEscapingTest,
HTMLWashingTest,
HTMLMarkupRemovalTest,
HTMLTidyingTest,
HTMLAutomaticLinksTransformation,
HTMLCreation,
JavascriptCharactersEscapingTest)
if __name__ == "__main__":
run_test_suite(TEST_SUITE)

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