Manage oslo_middleware/max_request_body_size

So that we can increase it from the default 114688

Useful in case for example the OS-Federation mapping is too large.

If this limit is breached keystone will return a 413 Entity Too Large
and not log anything to keystone.log.

Closes-Bug: #1835161

Change-Id: If9fc5c0bb5d6216b8656ee1673e1812c543de305
Signed-off-by: Johan Guldmyr <johan.guldmyr@csc.fi>
(cherry picked from commit a60980f3da)

manifests/init.pp

@@ -562,6 +562,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 # [*purge_config*]
 #   (optional) Whether to set only the specified config options
 #   in the keystone config.
@@ -762,6 +766,7 @@ class keystone(
   $keystone_group                       = $::keystone::params::keystone_group,
   $manage_policyrcd                     = false,
   $enable_proxy_headers_parsing         = $::os_service_default,
+  $max_request_body_size                = $::os_service_default,
   $purge_config                         = false,
   # DEPRECATED PARAMETERS
   $admin_workers                        = $::os_workers,
@@ -967,6 +972,7 @@ We have enabled caching as a backwards compatibility that will be removed in the
 
   oslo::middleware { 'keystone_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 
   # configure based on the catalog backend

releasenotes/notes/max_request_body_size-1835161-45ec3b7ab7c40cfa.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add support to configure `[oslo_middleware]/max_request_body_size` with
+    `$max_request_body_size` in the `keystone::` class.

spec/classes/keystone_init_spec.rb

@@ -836,6 +836,14 @@ describe 'keystone' do
     it { is_expected.to contain_keystone_config('oslo_middleware/enable_proxy_headers_parsing').with_value(true) }
   end
 
+  describe 'setting max_request_body_size' do
+    let :params do
+      default_params.merge({:max_request_body_size => '1146880' })
+    end
+
+    it { is_expected.to contain_keystone_config('oslo_middleware/max_request_body_size').with_value('1146880') }
+  end
+
   describe 'setting sql policy driver' do
     let :params do
       default_params.merge({:policy_driver => 'sql' })