docs: def generate_blob(self, container_name, blob_name, permission=None, 
                          expiry=None, start=None, id=None, ip=None, protocol=None,
                          cache_control=None, content_disposition=None,
                          content_encoding=None, content_language=None,
                          content_type=None):
          '''
          Generates a shared access signature for the blob.
          Use the returned signature with the sas_token parameter of any BlobService.
  
          :param str container_name:
              Name of container.
          :param str blob_name:
              Name of blob.
          :param BlobPermissions permission:
              The permissions associated with the shared access signature. The 
              user is restricted to operations allowed by the permissions.
              Permissions must be ordered read, write, delete, list.
              Required unless an id is given referencing a stored access policy 
              which contains this field. This field must be omitted if it has been 
              specified in an associated stored access policy.
          :param expiry:
              The time at which the shared access signature becomes invalid. 
              Required unless an id is given referencing a stored access policy 
              which contains this field. This field must be omitted if it has 
              been specified in an associated stored access policy. Azure will always 
              convert values to UTC. If a date is passed in without timezone info, it 
              is assumed to be UTC.
          :type expiry: date or str
          :param start:
              The time at which the shared access signature becomes valid. If 
              omitted, start time for this call is assumed to be the time when the 
              storage service receives the request. Azure will always convert values 
              to UTC. If a date is passed in without timezone info, it is assumed to 
              be UTC.
          :type start: date or str
          :param str id:
              A unique value up to 64 characters in length that correlates to a 
              stored access policy. To create a stored access policy, use 
              set_blob_service_properties.
          :param str ip:
              Specifies an IP address or a range of IP addresses from which to accept requests.
              If the IP address from which the request originates does not match the IP address
              or address range specified on the SAS token, the request is not authenticated.
              For example, specifying sip=168.1.5.65 or sip=168.1.5.60-168.1.5.70 on the SAS
              restricts the request to those IP addresses.
          :param str protocol:
              Specifies the protocol permitted for a request made. The default value
              is https,http. See :class:`~azure.storage.models.Protocol` for possible values.
          :param str cache_control:
              Response header value for Cache-Control when resource is accessed
              using this shared access signature.
          :param str content_disposition:
              Response header value for Content-Disposition when resource is accessed
              using this shared access signature.
          :param str content_encoding:
              Response header value for Content-Encoding when resource is accessed
              using this shared access signature.
          :param str content_language:
              Response header value for Content-Language when resource is accessed
              using this shared access signature.
          :param str content_type:
              Response header value for Content-Type when resource is accessed
              using this shared access signature.
          '''
          resource_path = container_name + '/' + blob_name
  
          sas = _SharedAccessHelper()
          sas.add_base(permission, expiry, start, ip, protocol)
          sas.add_id(id)
          sas.add_resource('b')
          sas.add_override_response_headers(cache_control, content_disposition, 
                                            content_encoding, content_language, 
                                            content_type)
          sas.add_resource_signature(self.account_name, self.account_key, 'blob', resource_path)
  
          return sas.get_token()