# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
from azure.core.pipeline.policies import ContentDecodePolicy, SansIOHTTPPolicy
from azure.identity import ClientSecretCredential, TokenCachePersistenceOptions
from azure.identity._enums import RegionalAuthority
from azure.identity._constants import EnvironmentVariables
from azure.identity._internal.user_agent import USER_AGENT
from msal import TokenCache
import pytest
from six.moves.urllib_parse import urlparse

from helpers import build_aad_response, get_discovery_response, mock_response, msal_validating_transport, Request

try:
    from unittest.mock import Mock, patch
except ImportError:  # python < 3.3
    from mock import Mock, patch  # type: ignore


def test_tenant_id_validation():
    """The credential should raise ValueError when given an invalid tenant_id"""

    valid_ids = {"c878a2ab-8ef4-413b-83a0-199afb84d7fb", "contoso.onmicrosoft.com", "organizations", "common"}
    for tenant in valid_ids:
        ClientSecretCredential(tenant, "client-id", "secret")

    invalid_ids = {"", "my tenant", "my_tenant", "/", "\\", '"my-tenant"', "'my-tenant'"}
    for tenant in invalid_ids:
        with pytest.raises(ValueError):
            ClientSecretCredential(tenant, "client-id", "secret")


def test_no_scopes():
    """The credential should raise ValueError when get_token is called with no scopes"""

    credential = ClientSecretCredential("tenant-id", "client-id", "client-secret")
    with pytest.raises(ValueError):
        credential.get_token()


def test_policies_configurable():
    policy = Mock(spec_set=SansIOHTTPPolicy, on_request=Mock())

    transport = msal_validating_transport(
        requests=[Request()], responses=[mock_response(json_payload=build_aad_response(access_token="**"))]
    )

    credential = ClientSecretCredential(
        "tenant-id", "client-id", "client-secret", policies=[ContentDecodePolicy(), policy], transport=transport
    )

    credential.get_token("scope")

    assert policy.on_request.called


def test_user_agent():
    transport = msal_validating_transport(
        requests=[Request(required_headers={"User-Agent": USER_AGENT})],
        responses=[mock_response(json_payload=build_aad_response(access_token="**"))],
    )

    credential = ClientSecretCredential("tenant-id", "client-id", "client-secret", transport=transport)

    credential.get_token("scope")


def test_client_secret_credential():
    client_id = "fake-client-id"
    secret = "fake-client-secret"
    tenant_id = "fake-tenant-id"
    access_token = "***"

    transport = msal_validating_transport(
        endpoint="https://localhost/" + tenant_id,
        requests=[Request(url_substring=tenant_id, required_data={"client_id": client_id, "client_secret": secret})],
        responses=[mock_response(json_payload=build_aad_response(access_token=access_token))],
    )

    token = ClientSecretCredential(tenant_id, client_id, secret, transport=transport).get_token("scope")

    assert token.token == access_token


@pytest.mark.parametrize("authority", ("localhost", "https://localhost"))
def test_authority(authority):
    """the credential should accept an authority, with or without scheme, as an argument or environment variable"""

    tenant_id = "expected-tenant"
    parsed_authority = urlparse(authority)
    expected_netloc = parsed_authority.netloc or authority
    expected_authority = "https://{}/{}".format(expected_netloc, tenant_id)

    mock_ctor = Mock(
        return_value=Mock(acquire_token_silent_with_error=lambda *_, **__: {"access_token": "**", "expires_in": 42})
    )

    credential = ClientSecretCredential(tenant_id, "client-id", "secret", authority=authority)
    with patch("msal.ConfidentialClientApplication", mock_ctor):
        # must call get_token because the credential constructs the MSAL application lazily
        credential.get_token("scope")

    assert mock_ctor.call_count == 1
    _, kwargs = mock_ctor.call_args
    assert kwargs["authority"] == expected_authority
    mock_ctor.reset_mock()

    # authority can be configured via environment variable
    with patch.dict("os.environ", {EnvironmentVariables.AZURE_AUTHORITY_HOST: authority}, clear=True):
        credential = ClientSecretCredential(tenant_id, "client-id", "secret")
    with patch("msal.ConfidentialClientApplication", mock_ctor):
        credential.get_token("scope")

    assert mock_ctor.call_count == 1
    _, kwargs = mock_ctor.call_args
    assert kwargs["authority"] == expected_authority


def test_regional_authority():
    """the credential should configure MSAL with a regional authority specified via kwarg or environment variable"""

    mock_confidential_client = Mock(
        return_value=Mock(acquire_token_silent_with_error=lambda *_, **__: {"access_token": "**", "expires_in": 3600})
    )

    for region in RegionalAuthority:
        mock_confidential_client.reset_mock()

        # region can be configured via environment variable
        with patch.dict("os.environ", {EnvironmentVariables.AZURE_REGIONAL_AUTHORITY_NAME: region.value}, clear=True):
            credential = ClientSecretCredential("tenant", "client-id", "secret")
        with patch("msal.ConfidentialClientApplication", mock_confidential_client):
            credential.get_token("scope")

        assert mock_confidential_client.call_count == 1
        _, kwargs = mock_confidential_client.call_args
        assert kwargs["azure_region"] == region.value


def test_token_cache():
    """the credential should default to an in memory cache, and optionally use a persistent cache"""

    with patch("azure.identity._internal.msal_credentials._load_persistent_cache") as load_persistent_cache:
        credential = ClientSecretCredential("tenant", "client-id", "secret")
        assert not load_persistent_cache.called
        assert isinstance(credential._cache, TokenCache)

        ClientSecretCredential(
            "tenant", "client-id", "secret", cache_persistence_options=TokenCachePersistenceOptions()
        )
        assert load_persistent_cache.call_count == 1


def test_cache_multiple_clients():
    """the credential shouldn't use tokens issued to other service principals"""

    access_token_a = "token a"
    access_token_b = "not " + access_token_a
    transport_a = msal_validating_transport(
        requests=[Request()], responses=[mock_response(json_payload=build_aad_response(access_token=access_token_a))]
    )
    transport_b = msal_validating_transport(
        requests=[Request()], responses=[mock_response(json_payload=build_aad_response(access_token=access_token_b))]
    )

    cache = TokenCache()
    with patch("azure.identity._internal.msal_credentials._load_persistent_cache") as mock_cache_loader:
        mock_cache_loader.return_value = Mock(wraps=cache)
        credential_a = ClientSecretCredential(
            "tenant",
            "client-a",
            "secret",
            transport=transport_a,
            cache_persistence_options=TokenCachePersistenceOptions(),
        )
        assert mock_cache_loader.call_count == 1, "credential should load the persistent cache"

        credential_b = ClientSecretCredential(
            "tenant",
            "client-b",
            "secret",
            transport=transport_b,
            cache_persistence_options=TokenCachePersistenceOptions(),
        )
        assert mock_cache_loader.call_count == 2, "credential should load the persistent cache"

    # A caches a token
    scope = "scope"
    token_a = credential_a.get_token(scope)
    assert token_a.token == access_token_a
    assert transport_a.send.call_count == 3  # two MSAL discovery requests, one token request

    # B should get a different token for the same scope
    token_b = credential_b.get_token(scope)
    assert token_b.token == access_token_b
    assert transport_b.send.call_count == 3

    assert len(cache.find(TokenCache.CredentialType.ACCESS_TOKEN)) == 2


def test_multitenant_authentication():
    first_tenant = "first-tenant"
    first_token = "***"
    second_tenant = "second-tenant"
    second_token = first_token * 2

    def send(request, **kwargs):
        assert "tenant_id" not in kwargs, "tenant_id kwarg shouldn't get passed to send method"

        parsed = urlparse(request.url)
        tenant = parsed.path.split("/")[1]
        assert tenant in (first_tenant, second_tenant, "common"), 'unexpected tenant "{}"'.format(tenant)
        if "/oauth2/v2.0/token" not in parsed.path:
            return get_discovery_response("https://{}/{}".format(parsed.netloc, tenant))

        token = first_token if tenant == first_tenant else second_token
        return mock_response(json_payload=build_aad_response(access_token=token))

    credential = ClientSecretCredential(
        first_tenant, "client-id", "secret", transport=Mock(send=send), additionally_allowed_tenants=['*']
    )
    token = credential.get_token("scope")
    assert token.token == first_token

    token = credential.get_token("scope", tenant_id=first_tenant)
    assert token.token == first_token

    token = credential.get_token("scope", tenant_id=second_tenant)
    assert token.token == second_token

    # should still default to the first tenant
    token = credential.get_token("scope")
    assert token.token == first_token


def test_live_multitenant_authentication(live_service_principal):
    # first create a credential with a non-existent tenant
    credential = ClientSecretCredential(
        "...", live_service_principal["client_id"], live_service_principal["client_secret"], additionally_allowed_tenants=['*']
    )
    # then get a valid token for an actual tenant
    token = credential.get_token("https://vault.azure.net/.default", tenant_id=live_service_principal["tenant_id"])
    assert token.token
    assert token.expires_on


def test_multitenant_authentication_not_allowed():
    expected_tenant = "expected-tenant"
    expected_token = "***"

    def send(request, **_):
        parsed = urlparse(request.url)
        if "/oauth2/v2.0/token" not in parsed.path:
            return get_discovery_response("https://{}/{}".format(parsed.netloc, expected_tenant))

        tenant = parsed.path.split("/")[1]
        token = expected_token if tenant == expected_tenant else expected_token * 2
        return mock_response(json_payload=build_aad_response(access_token=token))

    credential = ClientSecretCredential(expected_tenant, "client-id", "secret", transport=Mock(send=send))

    token = credential.get_token("scope")
    assert token.token == expected_token

    token = credential.get_token("scope", tenant_id=expected_tenant)
    assert token.token == expected_token

    with patch.dict("os.environ", {EnvironmentVariables.AZURE_IDENTITY_DISABLE_MULTITENANTAUTH: "true"}):
        token = credential.get_token("scope", tenant_id="un" + expected_tenant)
        assert token.token == expected_token