Authorization VK API error: u'{"error":"invalid_request","error_description":"Security Error"}' - python-2.7

Question

I'm trying to authorize from my djano-app on vk.com. I'm using requests and client authorization. I'm trying to authorize by this way and getting an error:
{"error":"invalid_request","error_description":"Security Error"}
Internet suggests to re-login on VK in browser, but there isn't any solution for authorization from code.
My code:
class VkApiSingleton(object):
api_version = '5.95'
def __init__(self,
app_id=config.APP_ID,
login=config.ACCOUNT_LOGIN,
pswd=config.ACCOUNT_PASSWORD,
permissions='video,offline,groups'
):
# type: (int, str, str, str) -> None
self.app_id = app_id
self.app_user_login = login
self.app_user_pass = pswd
self.access_token = None
self.user_id = None
self.session = requests.Session()
self.form_parser = FormParser()
self.permissions = permissions
def __new__(cls, *args, **kwargs):
if not hasattr(cls, 'instance'):
cls.instance = super(VkApiSingleton, cls).__new__(cls, *args, **kwargs)
return cls.instance
#property
def get_session(self):
return self.session
def _parse_form(self, response):
# type: (requests.models.Response) -> None
self.form_parser = FormParser()
try:
self.form_parser.feed(str(response.content))
except Exception as err:
logger.exception(
'Error checking HTML form',
extra={'Error body': str(err)}
)
def _submit_form(self, **kwargs):
# type: (dict) -> requests.models.Response
if self.form_parser.method == 'post':
payload = copy.deepcopy(self.form_parser.params)
if kwargs.get('is_login', False):
payload.update({
'email': self.app_user_login,
'pass': self.app_user_pass
})
with self.get_session as session:
try:
return session.post(self.form_parser.url, data=payload)
except Exception as err:
logger.exception(
'Error submitting auth form',
extra={'Error body': str(err)}
)
raise VkApiError('Error submitting auth form: %s' % str(err))
def _log_in(self):
# type: () -> requests.models.Response
response = self._submit_form(is_login=True)
self._parse_form(response)
if response.status_code != 200:
raise VkApiError('Auth error: cant parse HTML form')
if 'pass' in response.text:
logger.error(
'Wrong login or password'
)
raise VkApiError('Wrong login or password')
return response
def _submit_permissions(self, url=None):
# type: () -> requests.models.Response
if 'submit_allow_access' in self.form_parser.params and 'grant_access' in self.form_parser.url:
return self._submit_form(token_url=url)
else:
logger.warning(
'Cant submit permissions for application'
)
def _get_token(self, response):
# type: (requests.models.Response) -> None
try:
params = response.url.split('#')[1].split('&')
self.access_token = params[0].split('=')[1]
self.user_id = params[2].split('=')[1]
except IndexError as err:
logger.error(
'Cant get access_token',
extra={'Error body': str(err)}
)
def auth(self):
auth_url = 'https://oauth.vk.com/authorize?revoke=1'
redirect_uri = 'https://oauth.vk.com/blank.html'
display = 'wap'
request_params = {
'client_id': self.app_id,
'scope': self.permissions,
'redirect_uri': redirect_uri,
'display': display,
'response_type': 'token',
'v': self.api_version
}
with self.get_session as session:
response = session.get(
auth_url,
params=request_params
)
self._parse_form(response)
if not self.form_parser.form_parsed:
raise VkApiError('Invalid HTML form. Check auth_url or params')
else:
login_response = self._log_in()
permissions_response = self._submit_permissions()
self._get_token(login_response)

Answer 1

If someone has a similar problem - I found some reasons of this.
1) Invalid type of authorization - try to use another type of authorization (it describes in official documentation)
2) Too many authorizations.
I solved problem like this:
1) Get token with "offline" permission by "Client Application Authorization"
2) Every time I need to use vk.api method - I am checking my token for expiring with secure method "secure.checkToken" (you need to get Service token to use this method. There are a lot of information in official documentation)
3) If my token expires - i am getting the new one.