import pytest
from helpers.cluster import ClickHouseCluster
import urllib.request, urllib.parse
import ssl
import os.path

HTTPS_PORT = 8443
NODE_IP = '10.5.172.77' # It's important for the node to work at this IP because 'server-cert.pem' requires that (see server-ext.cnf).
NODE_IP_WITH_HTTPS_PORT = NODE_IP + ':' + str(HTTPS_PORT)
SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))

cluster = ClickHouseCluster(__file__)
instance = cluster.add_instance('node', ipv4_address=NODE_IP,
                                main_configs=['configs/ssl_config.xml', 'certs/server-key.pem', 'certs/server-cert.pem', 'certs/ca-cert.pem'],
                                user_configs=["configs/users_with_ssl_auth.xml"])


@pytest.fixture(scope="module", autouse=True)
def started_cluster():
    try:
        cluster.start()
        yield cluster

    finally:
        cluster.shutdown()


def get_ssl_context(cert_name):
    context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
    context.load_verify_locations(cafile=f'{SCRIPT_DIR}/certs/ca-cert.pem')
    if cert_name:
        context.load_cert_chain(f'{SCRIPT_DIR}/certs/{cert_name}-cert.pem', f'{SCRIPT_DIR}/certs/{cert_name}-key.pem')
        context.verify_mode = ssl.CERT_REQUIRED
    context.check_hostname = True
    return context


def execute_query_https(query, user, enable_ssl_auth=True, cert_name=None, password=None):
    url = f'https://{NODE_IP_WITH_HTTPS_PORT}/?query={urllib.parse.quote(query)}'
    request = urllib.request.Request(url)
    request.add_header('X-ClickHouse-User', user)
    if enable_ssl_auth:
        request.add_header('X-ClickHouse-SSL-Certificate-Auth', 'on')
    if password:
        request.add_header('X-ClickHouse-Key', password)
    response = urllib.request.urlopen(request, context=get_ssl_context(cert_name)).read()
    return response.decode('utf-8')


def test_https():
    assert execute_query_https("SELECT currentUser()", user="john", cert_name='client1') == "john\n"
    assert execute_query_https("SELECT currentUser()", user="lucy", cert_name='client2') == "lucy\n"
    assert execute_query_https("SELECT currentUser()", user="lucy", cert_name='client3') == "lucy\n"


def test_https_wrong_cert():
    # Wrong certificate: different user's certificate
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="john", cert_name='client2')
    assert "HTTP Error 403" in str(err.value)

    # Wrong certificate: self-signed certificate.
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="john", cert_name='wrong')
    assert "unknown ca" in str(err.value)

    # No certificate.
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="john")
    assert "HTTP Error 403" in str(err.value)

    # No header enabling SSL authentication.
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="john", enable_ssl_auth=False, cert_name='client1')


def test_https_non_ssl_auth():
    # Users with non-SSL authentication are allowed, in this case we can skip sending a client certificate at all (because "verificationMode" is set to "relaxed").
    #assert execute_query_https("SELECT currentUser()", user="peter", enable_ssl_auth=False) == "peter\n"
    assert execute_query_https("SELECT currentUser()", user="jane", enable_ssl_auth=False, password='qwe123') == "jane\n"

    # But we still can send a certificate if we want.
    assert execute_query_https("SELECT currentUser()", user="peter", enable_ssl_auth=False, cert_name='client1') == "peter\n"
    assert execute_query_https("SELECT currentUser()", user="peter", enable_ssl_auth=False, cert_name='client2') == "peter\n"
    assert execute_query_https("SELECT currentUser()", user="peter", enable_ssl_auth=False, cert_name='client3') == "peter\n"
    
    assert execute_query_https("SELECT currentUser()", user="jane", enable_ssl_auth=False, password='qwe123', cert_name='client1') == "jane\n"
    assert execute_query_https("SELECT currentUser()", user="jane", enable_ssl_auth=False, password='qwe123', cert_name='client2') == "jane\n"
    assert execute_query_https("SELECT currentUser()", user="jane", enable_ssl_auth=False, password='qwe123', cert_name='client3') == "jane\n"

    # However if we send a certificate it must not be wrong.
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="peter", enable_ssl_auth=False, cert_name='wrong')
    assert "unknown ca" in str(err.value)
    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="jane", enable_ssl_auth=False, password='qwe123', cert_name='wrong')
    assert "unknown ca" in str(err.value)


def test_create_user():
    instance.query("CREATE USER emma IDENTIFIED WITH ssl_certificate CN 'client3'")
    assert execute_query_https("SELECT currentUser()", user="emma", cert_name='client3') == "emma\n"
    assert instance.query("SHOW CREATE USER emma") == "CREATE USER emma IDENTIFIED WITH ssl_certificate CN \\'client3\\'\n"

    instance.query("ALTER USER emma IDENTIFIED WITH ssl_certificate CN 'client2'")
    assert execute_query_https("SELECT currentUser()", user="emma", cert_name='client2') == "emma\n"
    assert instance.query("SHOW CREATE USER emma") == "CREATE USER emma IDENTIFIED WITH ssl_certificate CN \\'client2\\'\n"

    with pytest.raises(Exception) as err:
        execute_query_https("SELECT currentUser()", user="emma", cert_name='client3')
    assert "HTTP Error 403" in str(err.value)

    assert instance.query("SHOW CREATE USER lucy") == "CREATE USER lucy IDENTIFIED WITH ssl_certificate CN \\'client2\\', \\'client3\\'\n"

    assert instance.query("SELECT name, auth_type, auth_params FROM system.users WHERE name IN ['emma', 'lucy'] ORDER BY name") ==\
        "emma\tssl_certificate\t{\"common_names\":[\"client2\"]}\n"\
        "lucy\tssl_certificate\t{\"common_names\":[\"client2\",\"client3\"]}\n"