How to use the onelogin.saml2.utils.OneLogin_Saml2_Utils.now function in onelogin

:type raise_exceptions: Boolean

        :returns: True if the condition is valid, False otherwise
        :rtype: bool
        """
        conditions_nodes = self.__query_assertion('/saml:Conditions')

        for conditions_node in conditions_nodes:
            nb_attr = conditions_node.get('NotBefore')
            nooa_attr = conditions_node.get('NotOnOrAfter')
            if nb_attr and OneLogin_Saml2_Utils.parse_SAML_to_time(nb_attr) > OneLogin_Saml2_Utils.now() + OneLogin_Saml2_Constants.ALLOWED_CLOCK_DRIFT:
                raise OneLogin_Saml2_ValidationError(
                    'Could not validate timestamp: not yet valid. Check system clock.',
                    OneLogin_Saml2_ValidationError.ASSERTION_TOO_EARLY
                )
            if nooa_attr and OneLogin_Saml2_Utils.parse_SAML_to_time(nooa_attr) + OneLogin_Saml2_Constants.ALLOWED_CLOCK_DRIFT <= OneLogin_Saml2_Utils.now():
                raise OneLogin_Saml2_ValidationError(
                    'Could not validate timestamp: expired. Check system clock.',
                    OneLogin_Saml2_ValidationError.ASSERTION_EXPIRED
                )
        return True

def validate_timestamps(self):
        """
        Verifies that the document is valid according to Conditions Element

        :returns: True if the condition is valid, False otherwise
        :rtype: bool
        """
        conditions_nodes = self.__query_assertion('/saml:Conditions')

        for conditions_node in conditions_nodes:
            nb_attr = conditions_node.get('NotBefore')
            nooa_attr = conditions_node.get('NotOnOrAfter')
            if nb_attr and OneLogin_Saml2_Utils.parse_SAML_to_time(nb_attr) > OneLogin_Saml2_Utils.now() + OneLogin_Saml2_Constants.ALLOWED_CLOCK_DRIFT:
                return False
            if nooa_attr and OneLogin_Saml2_Utils.parse_SAML_to_time(nooa_attr) + OneLogin_Saml2_Constants.ALLOWED_CLOCK_DRIFT <= OneLogin_Saml2_Utils.now():
                return False
        return True

:param is_passive: Optional argument. When true the AuthNReuqest will set the Ispassive='true'.
        :type is_passive: bool

        :param set_nameid_policy: Optional argument. When true the AuthNReuqest will set a nameIdPolicy element.
        :type set_nameid_policy: bool
        """
        self.__settings = settings

        sp_data = self.__settings.get_sp_data()
        idp_data = self.__settings.get_idp_data()
        security = self.__settings.get_security_data()

        uid = OneLogin_Saml2_Utils.generate_unique_id()
        self.__id = uid
        issue_instant = OneLogin_Saml2_Utils.parse_time_to_SAML(OneLogin_Saml2_Utils.now())

        destination = idp_data['singleSignOnService']['url']

        provider_name_str = ''
        organization_data = settings.get_organization()
        if isinstance(organization_data, dict) and organization_data:
            langs = organization_data
            if 'en-US' in langs:
                lang = 'en-US'
            else:
                lang = sorted(langs)[0]

            display_name = 'displayname' in organization_data[lang] and organization_data[lang]['displayname']
            if display_name:
                provider_name_str = "\n" + '    ProviderName="%s"' % organization_data[lang]['displayname']

:param nq: IDP Name Qualifier
        :type: string
        """
        self.__settings = settings
        self.__error = None
        self.id = None

        if request is None:
            sp_data = self.__settings.get_sp_data()
            idp_data = self.__settings.get_idp_data()
            security = self.__settings.get_security_data()

            uid = OneLogin_Saml2_Utils.generate_unique_id()
            self.id = uid

            issue_instant = OneLogin_Saml2_Utils.parse_time_to_SAML(OneLogin_Saml2_Utils.now())

            cert = None
            if security['nameIdEncrypted']:
                cert = idp_data['x509cert']

            if name_id is not None:
                name_id_format = sp_data['NameIDFormat']
                sp_name_qualifier = None
            else:
                name_id = idp_data['entityId']
                name_id_format = OneLogin_Saml2_Constants.NAMEID_ENTITY
                sp_name_qualifier = sp_data['entityId']

            name_id_obj = OneLogin_Saml2_Utils.generate_name_id(
                name_id,
                sp_name_qualifier,

sc_data = scn.find('saml:SubjectConfirmationData', namespaces=OneLogin_Saml2_Constants.NSMAP)
                    if sc_data is None:
                        continue
                    else:
                        irt = sc_data.get('InResponseTo', None)
                        if (in_response_to is None and irt is not None and
                           security.get('rejectUnsolicitedResponsesWithInResponseTo', False)) or \
                           in_response_to and irt and irt != in_response_to:
                            continue
                        recipient = sc_data.get('Recipient', None)
                        if recipient and current_url not in recipient:
                            continue
                        nooa = sc_data.get('NotOnOrAfter', None)
                        if nooa:
                            parsed_nooa = OneLogin_Saml2_Utils.parse_SAML_to_time(nooa)
                            if parsed_nooa <= OneLogin_Saml2_Utils.now():
                                continue
                        nb = sc_data.get('NotBefore', None)
                        if nb:
                            parsed_nb = OneLogin_Saml2_Utils.parse_SAML_to_time(nb)
                            if parsed_nb > OneLogin_Saml2_Utils.now():
                                continue

                        if nooa:
                            self.valid_scd_not_on_or_after = OneLogin_Saml2_Utils.parse_SAML_to_time(nooa)

                        any_subject_confirmation = True
                        break

                if not any_subject_confirmation:
                    raise OneLogin_Saml2_ValidationError(
                        'A valid SubjectConfirmation was not found on this Response',

get_data = ('get_data' in request_data and request_data['get_data']) or dict()

            if self.__settings.is_strict():
                res = OneLogin_Saml2_XML.validate_xml(root, 'saml-schema-protocol-2.0.xsd', self.__settings.is_debug_active())
                if isinstance(res, str):
                    raise Exception('Invalid SAML Logout Request. Not match the saml-schema-protocol-2.0.xsd')

                security = self.__settings.get_security_data()

                current_url = OneLogin_Saml2_Utils.get_self_url_no_query(request_data)

                # Check NotOnOrAfter
                if root.get('NotOnOrAfter', None):
                    na = OneLogin_Saml2_Utils.parse_SAML_to_time(root.get('NotOnOrAfter'))
                    if na <= OneLogin_Saml2_Utils.now():
                        raise Exception('Timing issues (please check your clock settings)')

                # Check destination
                if root.get('Destination', None):
                    destination = root.get('Destination')
                    if destination != '':
                        if current_url not in destination:
                            raise Exception(
                                'The LogoutRequest was received at '
                                '%(currentURL)s instead of %(destination)s' %
                                {
                                    'currentURL': current_url,
                                    'destination': destination,
                                }
                            )

if self.__settings.is_strict():
                res = OneLogin_Saml2_Utils.validate_xml(dom, 'saml-schema-protocol-2.0.xsd', self.__settings.is_debug_active())
                if not isinstance(res, Document):
                    raise OneLogin_Saml2_ValidationError(
                        'Invalid SAML Logout Request. Not match the saml-schema-protocol-2.0.xsd',
                        OneLogin_Saml2_ValidationError.INVALID_XML_FORMAT
                    )

                security = self.__settings.get_security_data()

                current_url = OneLogin_Saml2_Utils.get_self_url_no_query(request_data)

                # Check NotOnOrAfter
                if dom.get('NotOnOrAfter', None):
                    na = OneLogin_Saml2_Utils.parse_SAML_to_time(dom.get('NotOnOrAfter'))
                    if na <= OneLogin_Saml2_Utils.now():
                        raise OneLogin_Saml2_ValidationError(
                            'Could not validate timestamp: expired. Check system clock.',
                            OneLogin_Saml2_ValidationError.RESPONSE_EXPIRED
                        )

                # Check destination
                if dom.get('Destination', None):
                    destination = dom.get('Destination')
                    if destination != '':
                        if current_url not in destination:
                            raise Exception(
                                'The LogoutRequest was received at '
                                '%(currentURL)s instead of %(destination)s' %
                                {
                                    'currentURL': current_url,
                                    'destination': destination,

raise Exception('The response was received at %s instead of %s' % (current_url, destination))

                # Checks audience
                valid_audiences = self.get_audiences()
                if valid_audiences and sp_entity_id not in valid_audiences:
                    raise Exception('%s is not a valid audience for this Response' % sp_entity_id)

                # Checks the issuers
                issuers = self.get_issuers()
                for issuer in issuers:
                    if issuer is None or issuer != idp_entity_id:
                        raise Exception('Invalid issuer in the Assertion/Response')

                # Checks the session Expiration
                session_expiration = self.get_session_not_on_or_after()
                if session_expiration and session_expiration <= OneLogin_Saml2_Utils.now():
                    raise Exception('The attributes have expired, based on the SessionNotOnOrAfter of the AttributeStatement of this Response')

                # Checks the SubjectConfirmation, at least one SubjectConfirmation must be valid
                any_subject_confirmation = False
                subject_confirmation_nodes = self.__query_assertion('/saml:Subject/saml:SubjectConfirmation')

                for scn in subject_confirmation_nodes:
                    method = scn.get('Method', None)
                    if method and method != OneLogin_Saml2_Constants.CM_BEARER:
                        continue
                    sc_data = scn.find('saml:SubjectConfirmationData', namespaces=OneLogin_Saml2_Constants.NSMAP)
                    if sc_data is None:
                        continue
                    else:
                        irt = sc_data.get('InResponseTo', None)
                        if in_response_to and irt and irt != in_response_to:

:type: string

        """
        self.__settings = settings
        self.__error = None
        self.id = None

        if request is None:
            sp_data = self.__settings.get_sp_data()
            idp_data = self.__settings.get_idp_data()
            security = self.__settings.get_security_data()

            uid = OneLogin_Saml2_Utils.generate_unique_id()
            self.id = uid

            issue_instant = OneLogin_Saml2_Utils.parse_time_to_SAML(OneLogin_Saml2_Utils.now())

            cert = None
            if 'nameIdEncrypted' in security and security['nameIdEncrypted']:
                exists_multix509enc = 'x509certMulti' in idp_data and \
                    'encryption' in idp_data['x509certMulti'] and \
                    idp_data['x509certMulti']['encryption']
                if exists_multix509enc:
                    cert = idp_data['x509certMulti']['encryption'][0]
                else:
                    cert = idp_data['x509cert']

            if name_id is not None:
                if not name_id_format and sp_data['NameIDFormat'] != OneLogin_Saml2_Constants.NAMEID_UNSPECIFIED:
                    name_id_format = sp_data['NameIDFormat']
            else:
                name_id = idp_data['entityId']