# -*- coding: utf-8 -*-
#
# Copyright (C) 2007-2013 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://trac.edgewall.org/log/.

import unittest
from genshi.builder import Element, Fragment, tag
from genshi.input import HTML

import trac.tests.compat
from trac.core import TracError
from trac.util.html import TracHTMLSanitizer, find_element, to_fragment
from trac.util.translation import gettext, tgettext


class TracHTMLSanitizerTestCase(unittest.TestCase):
    def test_expression(self):
        html = HTML('<div style="top:expression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_capital_expression(self):
        html = HTML('<div style="top:EXPRESSION(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_expression_with_comments(self):
        html = HTML(r'<div style="top:exp/**/ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div style="top:exp ression(alert())">XSS</div>',
                         unicode(html | TracHTMLSanitizer()))
        html = HTML(r'<div style="top:exp//**/**/ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual(
            '<div style="top:exp/ **/ression(alert())">XSS</div>',
            unicode(html | TracHTMLSanitizer()))
        html = HTML(r'<div style="top:ex/*p*/ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div style="top:ex ression(alert())">XSS</div>',
                         unicode(html | TracHTMLSanitizer()))

    def test_url_with_javascript(self):
        html = HTML('<div style="background-image:url(javascript:alert())">'
                    'XSS</div>', encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_capital_url_with_javascript(self):
        html = HTML('<div style="background-image:URL(javascript:alert())">'
                    'XSS</div>', encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_unicode_escapes(self):
        html = HTML(r'<div style="top:exp\72 ess\000069 on(alert())">'
                    r'XSS</div>', encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        # escaped backslash
        html = HTML(r'<div style="top:exp\5c ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual(r'<div style="top:exp\\ression(alert())">XSS</div>',
                         unicode(html | TracHTMLSanitizer()))
        html = HTML(r'<div style="top:exp\5c 72 ession(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual(r'<div style="top:exp\\72 ession(alert())">XSS</div>',
                         unicode(html | TracHTMLSanitizer()))
        # escaped control characters
        html = HTML(r'<div style="top:exp\000000res\1f sion(alert())">'
                    r'XSS</div>', encoding='utf-8')
        self.assertEqual('<div style="top:exp res sion(alert())">XSS</div>',
                         unicode(html | TracHTMLSanitizer()))

    def test_backslash_without_hex(self):
        html = HTML(r'<div style="top:e\xp\ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        html = HTML(r'<div style="top:e\\xp\\ression(alert())">XSS</div>',
                    encoding='utf-8')
        self.assertEqual(r'<div style="top:e\\xp\\ression(alert())">'
                         'XSS</div>',
                         unicode(html | TracHTMLSanitizer()))

    def test_unsafe_props(self):
        html = HTML('<div style="POSITION:RELATIVE">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        html = HTML('<div style="position:STATIC">safe</div>',
                    encoding='utf-8')
        self.assertEqual('<div style="position:STATIC">safe</div>',
                         unicode(html | TracHTMLSanitizer()))

        html = HTML('<div style="behavior:url(test.htc)">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

        html = HTML('<div style="-ms-behavior:url(test.htc) url(#obj)">'
                    'XSS</div>', encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

        html = HTML("""<div style="-o-link:'javascript:alert(1)';"""
                    """-o-link-source:current">XSS</div>""", encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

        html = HTML("""<div style="-moz-binding:url(xss.xbl)">XSS</div>""",
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_nagative_margin(self):
        html = HTML('<div style="margin-top:-9999px">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        html = HTML('<div style="margin:0 -9999px">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_css_hack(self):
        html = HTML('<div style="*position:static">XSS</div>',
                    encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

        html = HTML('<div style="_margin:-10px">XSS</div>', encoding='utf-8')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_property_name(self):
        html = HTML('<div style="display:none;border-left-color:red;'
                    'user_defined:1;-moz-user-selct:-moz-all">prop</div>',
                    encoding='utf-8')
        self.assertEqual('<div style="display:none; border-left-color:red'
                         '">prop</div>',
                         unicode(html | TracHTMLSanitizer()))

    def test_unicode_expression(self):
        # Fullwidth small letters
        html = HTML(u'<div style="top:ｅｘｐｒｅｓｓｉｏｎ(alert())">'
                    u'XSS</div>')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        # Fullwidth capital letters
        html = HTML(u'<div style="top:ＥＸＰＲＥＳＳＩＯＮ(alert())">'
                    u'XSS</div>')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))
        # IPA extensions
        html = HTML(u'<div style="top:expʀessɪoɴ(alert())">'
                    u'XSS</div>')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))

    def test_unicode_url(self):
        # IPA extensions
        html = HTML(u'<div style="background-image:uʀʟ(javascript:alert())">'
                    u'XSS</div>')
        self.assertEqual('<div>XSS</div>', unicode(html | TracHTMLSanitizer()))


class FindElementTestCase(unittest.TestCase):
    def test_find_element_with_tag(self):
        frag = tag(tag.p('Paragraph with a ',
                   tag.a('link', href='http://www.edgewall.org'),
                   ' and some ', tag.strong('strong text')))
        self.assertIsNotNone(find_element(frag, tag='p'))
        self.assertIsNotNone(find_element(frag, tag='a'))
        self.assertIsNotNone(find_element(frag, tag='strong'))
        self.assertIsNone(find_element(frag, tag='input'))
        self.assertIsNone(find_element(frag, tag='textarea'))


class ToFragmentTestCase(unittest.TestCase):

    def test_unicode(self):
        rv = to_fragment('blah')
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('blah', unicode(rv))

    def test_fragment(self):
        rv = to_fragment(tag('blah'))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('blah', unicode(rv))

    def test_element(self):
        rv = to_fragment(tag.p('blah'))
        self.assertEqual(Element, type(rv))
        self.assertEqual('<p>blah</p>', unicode(rv))

    def test_tracerror(self):
        rv = to_fragment(TracError('blah'))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('blah', unicode(rv))

    def test_tracerror_with_fragment(self):
        message = tag('Powered by ',
                      tag.a('Trac', href='http://trac.edgewall.org/'))
        rv = to_fragment(TracError(message))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('Powered by <a href="http://trac.edgewall.org/">Trac'
                         '</a>', unicode(rv))

    def test_tracerror_with_element(self):
        message = tag.p('Powered by ',
                        tag.a('Trac', href='http://trac.edgewall.org/'))
        rv = to_fragment(TracError(message))
        self.assertEqual(Element, type(rv))
        self.assertEqual('<p>Powered by <a href="http://trac.edgewall.org/">'
                         'Trac</a></p>', unicode(rv))

    def test_error(self):
        rv = to_fragment(ValueError('invalid literal for int(): blah'))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('invalid literal for int(): blah', unicode(rv))

    def test_gettext(self):
        rv = to_fragment(gettext('%(size)s bytes', size=0))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('0 bytes', unicode(rv))

    def test_tgettext(self):
        rv = to_fragment(tgettext('Back to %(parent)s',
                                  parent=tag.a('WikiStart',
                                               href='http://localhost/')))
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('Back to <a href="http://localhost/">WikiStart</a>',
                         unicode(rv))

    def test_tracerror_with_gettext(self):
        e = TracError(gettext('%(size)s bytes', size=0))
        rv = to_fragment(e)
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('0 bytes', unicode(rv))

    def test_tracerror_with_tgettext(self):
        e = TracError(tgettext('Back to %(parent)s',
                               parent=tag.a('WikiStart',
                                            href='http://localhost/')))
        rv = to_fragment(e)
        self.assertEqual(Fragment, type(rv))
        self.assertEqual('Back to <a href="http://localhost/">WikiStart</a>',
                         unicode(rv))


def suite():
    suite = unittest.TestSuite()
    suite.addTest(unittest.makeSuite(TracHTMLSanitizerTestCase))
    suite.addTest(unittest.makeSuite(FindElementTestCase))
    suite.addTest(unittest.makeSuite(ToFragmentTestCase))
    return suite


if __name__ == '__main__':
    unittest.main(defaultTest='suite')
