import time

import jwt
import pytest

from app import app, instance_keys
from auth.auth_context_type import ValidatedAuthContext
from auth.registry_jwt_auth import identity_from_bearer_token, InvalidJWTException
from data import model  # TODO(jzelinskie): remove this after service keys are decoupled
from data.database import ServiceKeyApprovalType
from initdb import setup_database_for_testing, finished_database_for_testing
from util.morecollections import AttrDict
from util.security.registry_jwt import ANONYMOUS_SUB, build_context_and_subject

TEST_AUDIENCE = app.config['SERVER_HOSTNAME']
TEST_USER = AttrDict({'username': 'joeuser', 'uuid': 'foobar', 'enabled': True})
MAX_SIGNED_S = 3660
TOKEN_VALIDITY_LIFETIME_S = 60 * 60  # 1 hour
ANONYMOUS_SUB = '(anonymous)'
SERVICE_NAME = 'quay'

# This import has to come below any references to "app".
from test.fixtures import *


def _access(typ='repository', name='somens/somerepo', actions=None):
  actions = [] if actions is None else actions
  return [{
    'type': typ,
    'name': name,
    'actions': actions,
  }]


def _delete_field(token_data, field_name):
  token_data.pop(field_name)
  return token_data


def _token_data(access=[], context=None, audience=TEST_AUDIENCE, user=TEST_USER, iat=None,
                exp=None, nbf=None, iss=None, subject=None):
  if subject is None:
    _, subject = build_context_and_subject(ValidatedAuthContext(user=user))
  return {
    'iss': iss or instance_keys.service_name,
    'aud': audience,
    'nbf': nbf if nbf is not None else int(time.time()),
    'iat': iat if iat is not None else int(time.time()),
    'exp': exp if exp is not None else int(time.time() + TOKEN_VALIDITY_LIFETIME_S),
    'sub': subject,
    'access': access,
    'context': context,
  }


def _token(token_data, key_id=None, private_key=None, skip_header=False, alg=None):
  key_id = key_id or instance_keys.local_key_id
  private_key = private_key or instance_keys.local_private_key

  if alg == "none":
    private_key = None

  token_headers = {'kid': key_id}

  if skip_header:
    token_headers = {}

  token_data = jwt.encode(token_data, private_key, alg or 'RS256', headers=token_headers)
  return 'Bearer {0}'.format(token_data)


def _parse_token(token):
  return identity_from_bearer_token(token)[0]


def test_accepted_token(initialized_db):
  token = _token(_token_data())
  identity = _parse_token(token)
  assert identity.id == TEST_USER.username, 'should be %s, but was %s' % (TEST_USER.username,
                                                                          identity.id)
  assert len(identity.provides) == 0

  anon_token = _token(_token_data(user=None))
  anon_identity = _parse_token(anon_token)
  assert anon_identity.id == ANONYMOUS_SUB, 'should be %s, but was %s' % (ANONYMOUS_SUB,
                                                                          anon_identity.id)
  assert len(identity.provides) == 0


@pytest.mark.parametrize('access', [
  (_access(actions=['pull', 'push'])),
  (_access(actions=['pull', '*'])),
  (_access(actions=['*', 'push'])),
  (_access(actions=['*'])),
  (_access(actions=['pull', '*', 'push'])),])
def test_token_with_access(access, initialized_db):
  token = _token(_token_data(access=access))
  identity = _parse_token(token)
  assert identity.id == TEST_USER.username, 'should be %s, but was %s' % (TEST_USER.username,
                                                                          identity.id)
  assert len(identity.provides) == 1

  role = list(identity.provides)[0][3]
  if "*" in access[0]['actions']:
    assert role == 'admin'
  elif "push" in access[0]['actions']:
    assert role == 'write'
  elif "pull" in access[0]['actions']:
    assert role == 'read'


@pytest.mark.parametrize('token', [
  (_token(
    _token_data(access=[{
      'toipe': 'repository',
      'namesies': 'somens/somerepo',
      'akshuns': ['pull', 'push', '*']}]))),
  (_token(_token_data(audience='someotherapp'))),
  (_token(_delete_field(_token_data(), 'aud'))),
  (_token(_token_data(nbf=int(time.time()) + 600))),
  (_token(_delete_field(_token_data(), 'nbf'))),
  (_token(_token_data(iat=int(time.time()) + 600))),
  (_token(_delete_field(_token_data(), 'iat'))),
  (_token(_token_data(exp=int(time.time()) + MAX_SIGNED_S * 2))),
  (_token(_token_data(exp=int(time.time()) - 60))),
  (_token(_delete_field(_token_data(), 'exp'))),
  (_token(_delete_field(_token_data(), 'sub'))),
  (_token(_token_data(iss='badissuer'))),
  (_token(_delete_field(_token_data(), 'iss'))),
  (_token(_token_data(), skip_header=True)),
  (_token(_token_data(), key_id='someunknownkey')),
  (_token(_token_data(), key_id='kid7')),
  (_token(_token_data(), alg='none', private_key=None)),
  ('some random token'),
  ('Bearer: sometokenhere'),
  ('\nBearer: dGVzdA'),])
def test_invalid_jwt(token, initialized_db):
  with pytest.raises(InvalidJWTException):
    _parse_token(token)


def test_mixing_keys_e2e(initialized_db):
  token_data = _token_data()

  # Create a new key for testing.
  p, key = model.service_keys.generate_service_key(instance_keys.service_name, None, kid='newkey',
                                                   name='newkey', metadata={})
  private_key = p.exportKey('PEM')

  # Test first with the new valid, but unapproved key.
  unapproved_key_token = _token(token_data, key_id='newkey', private_key=private_key)
  with pytest.raises(InvalidJWTException):
    _parse_token(unapproved_key_token)

  # Approve the key and try again.
  admin_user = model.user.get_user('devtable')
  model.service_keys.approve_service_key(key.kid, admin_user, ServiceKeyApprovalType.SUPERUSER)

  valid_token = _token(token_data, key_id='newkey', private_key=private_key)

  identity = _parse_token(valid_token)
  assert identity.id == TEST_USER.username
  assert len(identity.provides) == 0

  # Try using a different private key with the existing key ID.
  bad_private_token = _token(token_data, key_id='newkey',
                             private_key=instance_keys.local_private_key)
  with pytest.raises(InvalidJWTException):
    _parse_token(bad_private_token)

  # Try using a different key ID with the existing private key.
  kid_mismatch_token = _token(token_data, key_id=instance_keys.local_key_id,
                              private_key=private_key)
  with pytest.raises(InvalidJWTException):
    _parse_token(kid_mismatch_token)

  # Delete the new key.
  key.delete_instance(recursive=True)

  # Ensure it still works (via the cache.)
  deleted_key_token = _token(token_data, key_id='newkey', private_key=private_key)
  identity = _parse_token(deleted_key_token)
  assert identity.id == TEST_USER.username
  assert len(identity.provides) == 0

  # Break the cache.
  instance_keys.clear_cache()

  # Ensure the key no longer works.
  with pytest.raises(InvalidJWTException):
    _parse_token(deleted_key_token)