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import os
import tempfile
import unittest

from webkitpy.common.net.credentials import Credentials
from webkitpy.common.system.executive import Executive
from webkitpy.common.system.outputcapture import OutputCapture
from webkitpy.common.system.user_mock import MockUser
from webkitpy.thirdparty.mock import Mock
from webkitpy.tool.mocktool import MockOptions
from webkitpy.common.system.executive_mock import MockExecutive


# FIXME: Other unit tests probably want this class.
class _TemporaryDirectory(object):
    def __init__(self, **kwargs):
        self._kwargs = kwargs
        self._directory_path = None

    def __enter__(self):
        self._directory_path = tempfile.mkdtemp(**self._kwargs)
        return self._directory_path

    def __exit__(self, type, value, traceback):
        os.rmdir(self._directory_path)


# Note: All tests should use this class instead of Credentials directly to avoid using a real Executive.
class MockedCredentials(Credentials):
    def __init__(self, *args, **kwargs):
        if 'executive' not in kwargs:
            kwargs['executive'] = MockExecutive()
        Credentials.__init__(self, *args, **kwargs)


class CredentialsTest(unittest.TestCase):
    example_security_output = """keychain: "/Users/test/Library/Keychains/login.keychain"
class: "inet"
attributes:
    0x00000007 <blob>="bugs.webkit.org (test@webkit.org)"
    0x00000008 <blob>=<NULL>
    "acct"<blob>="test@webkit.org"
    "atyp"<blob>="form"
    "cdat"<timedate>=0x32303039303832353233353231365A00  "20090825235216Z\000"
    "crtr"<uint32>=<NULL>
    "cusi"<sint32>=<NULL>
    "desc"<blob>="Web form password"
    "icmt"<blob>="default"
    "invi"<sint32>=<NULL>
    "mdat"<timedate>=0x32303039303930393137323635315A00  "20090909172651Z\000"
    "nega"<sint32>=<NULL>
    "path"<blob>=<NULL>
    "port"<uint32>=0x00000000 
    "prot"<blob>=<NULL>
    "ptcl"<uint32>="htps"
    "scrp"<sint32>=<NULL>
    "sdmn"<blob>=<NULL>
    "srvr"<blob>="bugs.webkit.org"
    "type"<uint32>=<NULL>
password: "SECRETSAUCE"
"""

    def test_keychain_lookup_on_non_mac(self):
        class FakeCredentials(MockedCredentials):
            def _is_mac_os_x(self):
                return False
        credentials = FakeCredentials("bugs.webkit.org")
        self.assertFalse(credentials._is_mac_os_x())
        self.assertEqual(credentials._credentials_from_keychain("foo"), ["foo", None])

    def test_security_output_parse(self):
        credentials = MockedCredentials("bugs.webkit.org")
        self.assertEqual(credentials._parse_security_tool_output(self.example_security_output), ["test@webkit.org", "SECRETSAUCE"])

    def test_security_output_parse_entry_not_found(self):
        # FIXME: This test won't work if the user has a credential for foo.example.com!
        credentials = Credentials("foo.example.com")
        if not credentials._is_mac_os_x():
            return # This test does not run on a non-Mac.

        # Note, we ignore the captured output because it is already covered
        # by the test case CredentialsTest._assert_security_call (below).
        outputCapture = OutputCapture()
        outputCapture.capture_output()
        self.assertIsNone(credentials._run_security_tool("find-internet-password"))
        outputCapture.restore_output()

    def _assert_security_call(self, username=None):
        executive_mock = Mock()
        credentials = MockedCredentials("example.com", executive=executive_mock)

        expected_logs = "Reading Keychain for example.com account and password.  Click \"Allow\" to continue...\n"
        OutputCapture().assert_outputs(self, credentials._run_security_tool, ["find-internet-password", username], expected_logs=expected_logs)

        security_args = ["/usr/bin/security", "find-internet-password", "-g", "-s", "example.com"]
        if username:
            security_args += ["-a", username]
        executive_mock.run_command.assert_called_with(security_args)

    def test_security_calls(self):
        self._assert_security_call()
        self._assert_security_call(username="foo")

    def test_credentials_from_environment(self):
        credentials = MockedCredentials("example.com")

        saved_environ = os.environ.copy()
        os.environ['WEBKIT_BUGZILLA_USERNAME'] = "foo"
        os.environ['WEBKIT_BUGZILLA_PASSWORD'] = "bar"
        username, password = credentials._credentials_from_environment()
        self.assertEqual(username, "foo")
        self.assertEqual(password, "bar")
        os.environ = saved_environ

    def test_read_credentials_without_git_repo(self):
        # FIXME: This should share more code with test_keyring_without_git_repo
        class FakeCredentials(MockedCredentials):
            def _is_mac_os_x(self):
                return True

            def _credentials_from_keychain(self, username):
                return ("test@webkit.org", "SECRETSAUCE")

            def _credentials_from_environment(self):
                return (None, None)

        with _TemporaryDirectory(suffix="not_a_git_repo") as temp_dir_path:
            credentials = FakeCredentials("bugs.webkit.org", cwd=temp_dir_path)
            # FIXME: Using read_credentials here seems too broad as higher-priority
            # credential source could be affected by the user's environment.
            self.assertEqual(credentials.read_credentials(), ("test@webkit.org", "SECRETSAUCE"))


    def test_keyring_without_git_repo(self):
        # FIXME: This should share more code with test_read_credentials_without_git_repo
        class MockKeyring(object):
            def get_password(self, host, username):
                return "NOMNOMNOM"

        class FakeCredentials(MockedCredentials):
            def _is_mac_os_x(self):
                return True

            def _credentials_from_keychain(self, username):
                return ("test@webkit.org", None)

            def _credentials_from_environment(self):
                return (None, None)

        with _TemporaryDirectory(suffix="not_a_git_repo") as temp_dir_path:
            credentials = FakeCredentials("fake.hostname", cwd=temp_dir_path, keyring=MockKeyring())
            # FIXME: Using read_credentials here seems too broad as higher-priority
            # credential source could be affected by the user's environment.
            self.assertEqual(credentials.read_credentials(), ("test@webkit.org", "NOMNOMNOM"))

    def test_keyring_without_git_repo_nor_keychain(self):
        class MockKeyring(object):
            def get_password(self, host, username):
                return "NOMNOMNOM"

        class FakeCredentials(MockedCredentials):
            def _credentials_from_keychain(self, username):
                return (None, None)

            def _credentials_from_environment(self):
                return (None, None)

        class FakeUser(MockUser):
            @classmethod
            def prompt(cls, message, repeat=1, raw_input=raw_input):
                return "test@webkit.org"

            @classmethod
            def prompt_password(cls, message, repeat=1, raw_input=raw_input):
                raise AssertionError("should not prompt for password")

        with _TemporaryDirectory(suffix="not_a_git_repo") as temp_dir_path:
            credentials = FakeCredentials("fake.hostname", cwd=temp_dir_path, keyring=MockKeyring())
            # FIXME: Using read_credentials here seems too broad as higher-priority
            # credential source could be affected by the user's environment.
            self.assertEqual(credentials.read_credentials(FakeUser), ("test@webkit.org", "NOMNOMNOM"))

    def test_do_not_use_stored_credentials(self):
        class MockKeyring(object):
            def get_password(self, host, username):
                raise AssertionError("Should not read from keyring.")

        class FakeCredentials(MockedCredentials):
            def _credentials_from_keychain(self, username):
                raise AssertionError("Should not read from keychain.")

            def _credentials_from_environment(self):
                raise AssertionError("Should not read from environment.")

            def _offer_to_store_credentials_in_keyring(self, username, password):
                pass

        class FakeUser(MockUser):
            @classmethod
            def prompt(cls, message, repeat=1, raw_input=raw_input):
                return "test@webkit.org"

            @classmethod
            def prompt_password(cls, message, repeat=1, raw_input=raw_input):
                return "NOMNOMNOM"

        with _TemporaryDirectory(suffix="not_a_git_repo") as temp_dir_path:
            credentials = FakeCredentials("fake.hostname", cwd=temp_dir_path, keyring=MockKeyring())
            self.assertEqual(credentials.read_credentials(FakeUser, use_stored_credentials=False), ("test@webkit.org", "NOMNOMNOM"))