base default values these default values are the ones set on email policy default if any of these defaults change the docs must be updated for each policy under test we give here what we expect the defaults to be for that policy the second argument to make defaults is the difference between the base defaults and that for the particular policy creating a new policy creates a new header factory there is a test later that proves this none of the attributes has a default value of none so we set them all to none in the clone call and check that it worked rfc 2047 chrome takes up 7 characters plus the length of the charset name so folding should fail if maxlen is lower than the minimum required length for a line note this is only triggered when there is a single word longer than maxlinelength hence the 1234567890 at the end of this whimsical subject this is because when we encounter a word longer than maxlinelength it is broken down into encoded words to fit maxlinelength if the maxlinelength isn t large enough to even contain the rfc 2047 chrome charset q we fail xxx need subclassing tests for adding subclassed objects make sure the usual rules apply subclass wins but that the order still works right overrides left the abstract methods are used by the parser but not by the wrapper functions that call it so if the exception gets raised we know that the policy was actually propagated all the way to feedparser these are redundant but we need them for blackbox completeness now that we ve established that all the parse methods get the policy in to feedparser we can use messagefromstring for the rest of the propagation tests for part in msg walk self assertispart policy self policy def testmessagepolicypropagatestogeneratorself msg self makemsgsubject testnto foonn policyemail policy default clonelinesep x s io stringio g email generator generators g flattenmsg self assertequals getvalue subject testxto fooxx def testmessagepolicyusedbyasstringself msg self makemsgsubject testnto foonn policyemail policy default clonelinesep x self assertequalmsg asstring subject testxto fooxx class testconcretepoliciesunittest testcase def testheaderstoreparserejectsnewlinesself instance email policy emailpolicy self assertraisesvalueerror instance headerstoreparse from spamneggfoo py if name main unittest main base default values these default values are the ones set on email policy default if any of these defaults change the docs must be updated for each policy under test we give here what we expect the defaults to be for that policy the second argument to make defaults is the difference between the base defaults and that for the particular policy creating a new policy creates a new header factory there is a test later that proves this none of the attributes has a default value of none so we set them all to none in the clone call and check that it worked rfc 2047 chrome takes up 7 characters plus the length of the charset name so folding should fail if maxlen is lower than the minimum required length for a line note this is only triggered when there is a single word longer than max_line_length hence the 1234567890 at the end of this whimsical subject this is because when we encounter a word longer than max_line_length it is broken down into encoded words to fit max_line_length if the max_line_length isn t large enough to even contain the rfc 2047 chrome charset q we fail xxx need subclassing tests for adding subclassed objects make sure the usual rules apply subclass wins but that the order still works right overrides left the abstract methods are used by the parser but not by the wrapper functions that call it so if the exception gets raised we know that the policy was actually propagated all the way to feedparser these are redundant but we need them for black box completeness now that we ve established that all the parse methods get the policy in to feedparser we can use message_from_string for the rest of the propagation tests subject mime test mime version 1 0 content type multipart mixed boundary xxx xxx content type text plain test xxx content type text plain test2 xxx
import io
import types
import textwrap
import unittest
import email.errors
import email.policy
import email.parser
import email.generator
import email.message
from email import headerregistry

def make_defaults(base_defaults, differences):
    defaults = base_defaults.copy()
    defaults.update(differences)
    return defaults

class PolicyAPITests(unittest.TestCase):

    longMessage = True

    
    compat32_defaults = {
        'max_line_length':          78,
        'linesep':                  '\n',
        'cte_type':                 '8bit',
        'raise_on_defect':          False,
        'mangle_from_':             True,
        'message_factory':          None,
        }
    
    
    policy_defaults = compat32_defaults.copy()
    policy_defaults.update({
        'utf8':                     False,
        'raise_on_defect':          False,
        'header_factory':           email.policy.EmailPolicy.header_factory,
        'refold_source':            'long',
        'content_manager':          email.policy.EmailPolicy.content_manager,
        'mangle_from_':             False,
        'message_factory':          email.message.EmailMessage,
        })

    
    
    
    new_policy = email.policy.EmailPolicy()
    policies = {
        email.policy.compat32: make_defaults(compat32_defaults, {}),
        email.policy.default: make_defaults(policy_defaults, {}),
        email.policy.SMTP: make_defaults(policy_defaults,
                                         {'linesep': '\r\n'}),
        email.policy.SMTPUTF8: make_defaults(policy_defaults,
                                             {'linesep': '\r\n',
                                              'utf8': True}),
        email.policy.HTTP: make_defaults(policy_defaults,
                                         {'linesep': '\r\n',
                                          'max_line_length': None}),
        email.policy.strict: make_defaults(policy_defaults,
                                           {'raise_on_defect': True}),
        new_policy: make_defaults(policy_defaults, {}),
        }
    
    
    policies[new_policy]['header_factory'] = new_policy.header_factory

    def test_defaults(self):
        for policy, expected in self.policies.items():
            for attr, value in expected.items():
                with self.subTest(policy=policy, attr=attr):
                    self.assertEqual(getattr(policy, attr), value,
                                    ("change {} docs/docstrings if defaults have "
                                    "changed").format(policy))

    def test_all_attributes_covered(self):
        for policy, expected in self.policies.items():
            for attr in dir(policy):
                with self.subTest(policy=policy, attr=attr):
                    if (attr.startswith('_') or
                            isinstance(getattr(email.policy.EmailPolicy, attr),
                                  types.FunctionType)):
                        continue
                    else:
                        self.assertIn(attr, expected,
                                      "{} is not fully tested".format(attr))

    def test_abc(self):
        with self.assertRaises(TypeError) as cm:
            email.policy.Policy()
        msg = str(cm.exception)
        abstract_methods = ('fold',
                            'fold_binary',
                            'header_fetch_parse',
                            'header_source_parse',
                            'header_store_parse')
        for method in abstract_methods:
            self.assertIn(method, msg)

    def test_policy_is_immutable(self):
        for policy, defaults in self.policies.items():
            for attr in defaults:
                with self.assertRaisesRegex(AttributeError, attr+".*read-only"):
                    setattr(policy, attr, None)
            with self.assertRaisesRegex(AttributeError, 'no attribute.*foo'):
                policy.foo = None

    def test_set_policy_attrs_when_cloned(self):
        
        
        for policyclass, defaults in self.policies.items():
            testattrdict = {attr: None for attr in defaults}
            policy = policyclass.clone(**testattrdict)
            for attr in defaults:
                self.assertIsNone(getattr(policy, attr))

    def test_reject_non_policy_keyword_when_called(self):
        for policyclass in self.policies:
            with self.assertRaises(TypeError):
                policyclass(this_keyword_should_not_be_valid=None)
            with self.assertRaises(TypeError):
                policyclass(newtline=None)

    def test_policy_addition(self):
        expected = self.policy_defaults.copy()
        p1 = email.policy.default.clone(max_line_length=100)
        p2 = email.policy.default.clone(max_line_length=50)
        added = p1 + p2
        expected.update(max_line_length=50)
        for attr, value in expected.items():
            self.assertEqual(getattr(added, attr), value)
        added = p2 + p1
        expected.update(max_line_length=100)
        for attr, value in expected.items():
            self.assertEqual(getattr(added, attr), value)
        added = added + email.policy.default
        for attr, value in expected.items():
            self.assertEqual(getattr(added, attr), value)

    def test_fold_zero_max_line_length(self):
        expected = 'Subject: =?utf-8?q?=C3=A1?=\n'

        msg = email.message.EmailMessage()
        msg['Subject'] = 'á'

        p1 = email.policy.default.clone(max_line_length=0)
        p2 = email.policy.default.clone(max_line_length=None)

        self.assertEqual(p1.fold('Subject', msg['Subject']), expected)
        self.assertEqual(p2.fold('Subject', msg['Subject']), expected)

    def test_register_defect(self):
        class Dummy:
            def __init__(self):
                self.defects = []
        obj = Dummy()
        defect = object()
        policy = email.policy.EmailPolicy()
        policy.register_defect(obj, defect)
        self.assertEqual(obj.defects, [defect])
        defect2 = object()
        policy.register_defect(obj, defect2)
        self.assertEqual(obj.defects, [defect, defect2])

    class MyObj:
        def __init__(self):
            self.defects = []

    class MyDefect(Exception):
        pass

    def test_handle_defect_raises_on_strict(self):
        foo = self.MyObj()
        defect = self.MyDefect("the telly is broken")
        with self.assertRaisesRegex(self.MyDefect, "the telly is broken"):
            email.policy.strict.handle_defect(foo, defect)

    def test_handle_defect_registers_defect(self):
        foo = self.MyObj()
        defect1 = self.MyDefect("one")
        email.policy.default.handle_defect(foo, defect1)
        self.assertEqual(foo.defects, [defect1])
        defect2 = self.MyDefect("two")
        email.policy.default.handle_defect(foo, defect2)
        self.assertEqual(foo.defects, [defect1, defect2])

    class MyPolicy(email.policy.EmailPolicy):
        defects = None
        def __init__(self, *args, **kw):
            super().__init__(*args, defects=[], **kw)
        def register_defect(self, obj, defect):
            self.defects.append(defect)

    def test_overridden_register_defect_still_raises(self):
        foo = self.MyObj()
        defect = self.MyDefect("the telly is broken")
        with self.assertRaisesRegex(self.MyDefect, "the telly is broken"):
            self.MyPolicy(raise_on_defect=True).handle_defect(foo, defect)

    def test_overridden_register_defect_works(self):
        foo = self.MyObj()
        defect1 = self.MyDefect("one")
        my_policy = self.MyPolicy()
        my_policy.handle_defect(foo, defect1)
        self.assertEqual(my_policy.defects, [defect1])
        self.assertEqual(foo.defects, [])
        defect2 = self.MyDefect("two")
        my_policy.handle_defect(foo, defect2)
        self.assertEqual(my_policy.defects, [defect1, defect2])
        self.assertEqual(foo.defects, [])

    def test_default_header_factory(self):
        h = email.policy.default.header_factory('Test', 'test')
        self.assertEqual(h.name, 'Test')
        self.assertIsInstance(h, headerregistry.UnstructuredHeader)
        self.assertIsInstance(h, headerregistry.BaseHeader)

    class Foo:
        parse = headerregistry.UnstructuredHeader.parse

    def test_each_Policy_gets_unique_factory(self):
        policy1 = email.policy.EmailPolicy()
        policy2 = email.policy.EmailPolicy()
        policy1.header_factory.map_to_type('foo', self.Foo)
        h = policy1.header_factory('foo', 'test')
        self.assertIsInstance(h, self.Foo)
        self.assertNotIsInstance(h, headerregistry.UnstructuredHeader)
        h = policy2.header_factory('foo', 'test')
        self.assertNotIsInstance(h, self.Foo)
        self.assertIsInstance(h, headerregistry.UnstructuredHeader)

    def test_clone_copies_factory(self):
        policy1 = email.policy.EmailPolicy()
        policy2 = policy1.clone()
        policy1.header_factory.map_to_type('foo', self.Foo)
        h = policy1.header_factory('foo', 'test')
        self.assertIsInstance(h, self.Foo)
        h = policy2.header_factory('foo', 'test')
        self.assertIsInstance(h, self.Foo)

    def test_new_factory_overrides_default(self):
        mypolicy = email.policy.EmailPolicy()
        myfactory = mypolicy.header_factory
        newpolicy = mypolicy + email.policy.strict
        self.assertEqual(newpolicy.header_factory, myfactory)
        newpolicy = email.policy.strict + mypolicy
        self.assertEqual(newpolicy.header_factory, myfactory)

    def test_adding_default_policies_preserves_default_factory(self):
        newpolicy = email.policy.default + email.policy.strict
        self.assertEqual(newpolicy.header_factory,
                         email.policy.EmailPolicy.header_factory)
        self.assertEqual(newpolicy.__dict__, {'raise_on_defect': True})

    def test_non_ascii_chars_do_not_cause_inf_loop(self):
        policy = email.policy.default.clone(max_line_length=20)
        actual = policy.fold('Subject', 'ą' * 12)
        self.assertEqual(
            actual,
            'Subject: \n' +
            12 * ' =?utf-8?q?=C4=85?=\n')

    def test_short_maxlen_error(self):
        
        
        

        
        
        
        
        
        
        subject = "Melt away the pounds with this one simple trick! 1234567890"

        for maxlen in [3, 7, 9]:
            with self.subTest(maxlen=maxlen):
                policy = email.policy.default.clone(max_line_length=maxlen)
                with self.assertRaises(email.errors.HeaderParseError):
                    policy.fold("Subject", subject)

    
    
    


class TestException(Exception):
    pass

class TestPolicyPropagation(unittest.TestCase):

    
    
    
    class MyPolicy(email.policy.Policy):
        def badmethod(self, *args, **kw):
            raise TestException("test")
        fold = fold_binary = header_fetch_parser = badmethod
        header_source_parse = header_store_parse = badmethod

    def test_message_from_string(self):
        with self.assertRaisesRegex(TestException, "^test$"):
            email.message_from_string("Subject: test\n\n",
                                      policy=self.MyPolicy)

    def test_message_from_bytes(self):
        with self.assertRaisesRegex(TestException, "^test$"):
            email.message_from_bytes(b"Subject: test\n\n",
                                     policy=self.MyPolicy)

    def test_message_from_file(self):
        f = io.StringIO('Subject: test\n\n')
        with self.assertRaisesRegex(TestException, "^test$"):
            email.message_from_file(f, policy=self.MyPolicy)

    def test_message_from_binary_file(self):
        f = io.BytesIO(b'Subject: test\n\n')
        with self.assertRaisesRegex(TestException, "^test$"):
            email.message_from_binary_file(f, policy=self.MyPolicy)

    

    def test_parser(self):
        p = email.parser.Parser(policy=self.MyPolicy)
        with self.assertRaisesRegex(TestException, "^test$"):
            p.parsestr('Subject: test\n\n')

    def test_bytes_parser(self):
        p = email.parser.BytesParser(policy=self.MyPolicy)
        with self.assertRaisesRegex(TestException, "^test$"):
            p.parsebytes(b'Subject: test\n\n')

    
    
    

    def _make_msg(self, source='Subject: test\n\n', policy=None):
        self.policy = email.policy.default.clone() if policy is None else policy
        return email.message_from_string(source, policy=self.policy)

    def test_parser_propagates_policy_to_message(self):
        msg = self._make_msg()
        self.assertIs(msg.policy, self.policy)

    def test_parser_propagates_policy_to_sub_messages(self):
        msg = self._make_msg(textwrap.dedent())
        for part in msg.walk():
            self.assertIs(part.policy, self.policy)

    def test_message_policy_propagates_to_generator(self):
        msg = self._make_msg("Subject: test\nTo: foo\n\n",
                             policy=email.policy.default.clone(linesep='X'))
        s = io.StringIO()
        g = email.generator.Generator(s)
        g.flatten(msg)
        self.assertEqual(s.getvalue(), "Subject: testXTo: fooXX")

    def test_message_policy_used_by_as_string(self):
        msg = self._make_msg("Subject: test\nTo: foo\n\n",
                             policy=email.policy.default.clone(linesep='X'))
        self.assertEqual(msg.as_string(), "Subject: testXTo: fooXX")


class TestConcretePolicies(unittest.TestCase):

    def test_header_store_parse_rejects_newlines(self):
        instance = email.policy.EmailPolicy()
        self.assertRaises(ValueError,
                          instance.header_store_parse,
                          'From', 'spam\negg@foo.py')


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