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re2o/api/pagination.py

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2.4 KiB
Python

# -*- mode: python; coding: utf-8 -*-
# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2018 Maël Kervella
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Defines the pagination classes used in the API to paginate the results.
"""
from rest_framework import pagination
class PageSizedPagination(pagination.PageNumberPagination):
"""Provide the possibility to control the page size by using the
'page_size' parameter. The value 'all' can be used for this parameter
to retrieve all the results in a single page.
Attributes:
page_size_query_param: The string to look for in the parameters of
a query to get the page_size requested.
all_pages_strings: A set of strings that can be used in the query to
request all results in a single page.
max_page_size: The maximum number of results a page can output no
matter what is requested.
"""
page_size_query_param = "page_size"
all_pages_strings = ("all",)
max_page_size = 10000
def get_page_size(self, request):
"""Retrieve the size of the page according to the parameters of the
request.
Args:
request: the request of the user
Returns:
A integer between 0 and `max_page_size` that represent the size
of the page to use.
"""
try:
page_size_str = request.query_params[self.page_size_query_param]
if page_size_str in self.all_pages_strings:
return self.max_page_size
except KeyError:
pass
return super(PageSizedPagination, self).get_page_size(request)