[RFC PATCH] REST: Add new setting for maximum API page size

[Andrew Donnellan]

In 41790caf59ad ("REST: Limit max page size") we limited the maximum page
size to the default page size in the settings.

This turns out to be rather restrictive, as we usually want to keep the
default page size low, but an administrator may want to allow API clients
to fetch more than that per request.

Add a new setting, MAX_REST_RESULTS_PER_PAGE, to set the maximum page size.

Closes: #202 ("Separate max API page size and default API page size into different settings")
Suggested-by: Stewart Smith <stewart at linux.ibm.com>
Suggested-by: Joel Stanley <joel at jms.id.au>
Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

---

This is completely untested but should work, sending this as an RFC because
I have no idea what the default should be, thoughts?
---
 docs/deployment/configuration.rst | 8 +++++++-
 patchwork/api/base.py             | 3 ++-
 patchwork/settings/base.py        | 1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/docs/deployment/configuration.rst b/docs/deployment/configuration.rst
index 347485636d47..e599522a412b 100644
--- a/docs/deployment/configuration.rst
+++ b/docs/deployment/configuration.rst
@@ -88,7 +88,13 @@ Enable the :doc:`REST API <../api/rest>`.
 The number of items to include in REST API responses by default. This can be
 overridden by the ``per_page`` parameter for some endpoints.
 
-.. versionadded:: 2.0
+``MAX_REST_RESULTS_PER_PAGE``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The maximum number of items that can be requested in a REST API request using
+the ``per_page`` parameter.
+
+.. versionadded:: 2.2
 
 ``COMPAT_REDIR``
 ~~~~~~~~~~~~~~~~
diff --git a/patchwork/api/base.py b/patchwork/api/base.py
index 8c38d5a1d5f4..bf452f78b390 100644
--- a/patchwork/api/base.py
+++ b/patchwork/api/base.py
@@ -36,7 +36,8 @@ class LinkHeaderPagination(PageNumberPagination):
        https://tools.ietf.org/html/rfc5988#section-5
        https://developer.github.com/guides/traversing-with-pagination
     """
-    page_size = max_page_size = settings.REST_RESULTS_PER_PAGE
+    page_size = settings.REST_RESULTS_PER_PAGE
+    max_page_size = settings.MAX_REST_RESULTS_PER_PAGE
     page_size_query_param = 'per_page'
 
     def get_paginated_response(self, data):
diff --git a/patchwork/settings/base.py b/patchwork/settings/base.py
index 4b0d5513895a..7dc20041ec42 100644
--- a/patchwork/settings/base.py
+++ b/patchwork/settings/base.py
@@ -220,6 +220,7 @@ ENABLE_XMLRPC = False
 ENABLE_REST_API = True
 
 REST_RESULTS_PER_PAGE = 30
+MAX_REST_RESULTS_PER_PAGE = 500
 
 # Set to True to enable redirections or URLs from previous versions
 # of patchwork
-- 
2.11.0