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# This software is provided 'as-is', without any express or implied
# warranty. In no event will the author be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
#
# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
import unittest
from dkim.canonicalization import (
CanonicalizationPolicy,
InvalidCanonicalizationPolicyError,
Simple,
Relaxed,
)
class BaseCanonicalizationTest(unittest.TestCase):
def assertCanonicalForm(self, expected, input):
self.assertEqual(expected, self.func(expected))
self.assertEqual(expected, self.func(input))
class TestSimpleAlgorithmHeaders(BaseCanonicalizationTest):
func = staticmethod(Simple.canonicalize_headers)
def test_untouched(self):
test_headers = [(b'Foo ', b'bar\r\n'), (b'Foo', b'baz\r\n')]
self.assertCanonicalForm(
test_headers,
test_headers)
class TestSimpleAlgorithmBody(BaseCanonicalizationTest):
func = staticmethod(Simple.canonicalize_body)
def test_strips_trailing_empty_lines_from_body(self):
self.assertCanonicalForm(
b'Foo \tbar \r\n',
b'Foo \tbar \r\n\r\n')
def test_adds_crlf(self):
self.assertCanonicalForm(
b'Foo bar\r\n',
b'Foo bar')
def test_empty_body(self):
self.assertCanonicalForm(
b'\r\n',
b'')
def test_single_crlf_body(self):
self.assertCanonicalForm(
b'\r\n',
b'\r\n')
def test_multiple_crlf_body(self):
self.assertCanonicalForm(
b'\r\n',
b'\r\n\r\n')
class TestRelaxedAlgorithmHeaders(BaseCanonicalizationTest):
func = staticmethod(Relaxed.canonicalize_headers)
def test_lowercases_names(self):
self.assertCanonicalForm(
[(b'foo', b'Bar\r\n'), (b'baz', b'Foo\r\n')],
[(b'Foo', b'Bar\r\n'), (b'BaZ', b'Foo\r\n')])
def test_unfolds_values(self):
self.assertCanonicalForm(
[(b'foo', b'Bar baz\r\n')],
[(b'Foo', b'Bar\r\n baz\r\n')])
def test_wsp_compresses_values(self):
self.assertCanonicalForm(
[(b'foo', b'Bar baz\r\n')],
[(b'Foo', b'Bar \t baz\r\n')])
def test_wsp_strips(self):
self.assertCanonicalForm(
[(b'foo', b'Bar baz\r\n')],
[(b'Foo ', b' Bar \t baz \r\n')])
class TestRelaxedAlgorithmBody(BaseCanonicalizationTest):
func = staticmethod(Relaxed.canonicalize_body)
def test_strips_trailing_wsp(self):
self.assertCanonicalForm(
b'Foo\r\nbar\r\n',
b'Foo \t\r\nbar\r\n')
def test_wsp_compresses(self):
self.assertCanonicalForm(
b'Foo bar\r\n',
b'Foo \t bar\r\n')
def test_strips_trailing_empty_lines(self):
self.assertCanonicalForm(
b'Foo\r\nbar\r\n',
b'Foo\r\nbar\r\n\r\n\r\n')
def test_adds_crlf(self):
self.assertCanonicalForm(
b'Foo bar\r\n',
b'Foo bar')
def test_empty_body(self):
self.assertCanonicalForm(
b'',
b'')
def test_single_crlf_body(self):
self.assertCanonicalForm(
b'',
b'\r\n')
def test_multiple_crlf_body(self):
self.assertCanonicalForm(
b'',
b'\r\n\r\n')
class TestCanonicalizationPolicyFromCValue(unittest.TestCase):
def assertAlgorithms(self, header_algo, body_algo, c_value):
p = CanonicalizationPolicy.from_c_value(c_value)
self.assertEqual(
(header_algo, body_algo),
(p.header_algorithm, p.body_algorithm))
def assertValueDoesNotParse(self, c_value):
self.assertRaises(
InvalidCanonicalizationPolicyError,
CanonicalizationPolicy.from_c_value, c_value)
def test_both_default_to_simple(self):
self.assertAlgorithms(Simple, Simple, None)
def test_relaxed_headers(self):
self.assertAlgorithms(Relaxed, Simple, b'relaxed')
def test_relaxed_body(self):
self.assertAlgorithms(Simple, Relaxed, b'simple/relaxed')
def test_relaxed_both(self):
self.assertAlgorithms(Relaxed, Relaxed, b'relaxed/relaxed')
def test_explict_simple_both(self):
self.assertAlgorithms(Simple, Simple, b'simple/simple')
def test_corruption_is_ignored(self):
self.assertValueDoesNotParse(b'')
self.assertValueDoesNotParse(b'simple/simple/simple')
self.assertValueDoesNotParse(b'relaxed/stressed')
self.assertValueDoesNotParse(b'worried')
class TestCanonicalizationPolicyToCValue(unittest.TestCase):
def assertCValue(self, c_value, header_algo, body_algo):
self.assertEqual(
c_value,
CanonicalizationPolicy(header_algo, body_algo).to_c_value())
def test_both_simple(self):
self.assertCValue(b'simple/simple', Simple, Simple)
def test_relaxed_body(self):
self.assertCValue(b'simple/relaxed', Simple, Relaxed)
def test_both_relaxed(self):
self.assertCValue(b'relaxed/relaxed', Relaxed, Relaxed)
def test_relaxed_headers(self):
self.assertCValue(b'relaxed/simple', Relaxed, Simple)
def test_suite():
from unittest import TestLoader
return TestLoader().loadTestsFromName(__name__)
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