Add support for [oslo_middleware] enable_proxy_headers_parsing

The enable_proxy_haders_parsing parameter was added into Octavia[1] so
that Octavia API can set up the request URL correctly.
This patch adds support for this parameter in octaiva::api module, so
that operators can set it according to their deployment architecture.

[1] https://review.opendev.org/#/c/639736/

Change-Id: I985abb8e5dcd6d29e794b200982f8bce99ac316c

manifests/api.pp

@@ -55,6 +55,11 @@
 #   (optional) Run octavia-db-manage upgrade head on api nodes after installing the package.
 #   Defaults to false
 #
+# [*enable_proxy_headers_parsing*]
+#   (Optional) Enable paste middleware to handle SSL requests through
+#   HTTPProxyToWSGI middleware.
+#   Defaults to $::os_service_default.
+#
 # [*default_provider_driver*]
 #   (optional) Configure the default provider driver.
 #   Defaults to $::os_service_default
@@ -82,6 +87,7 @@ class octavia::api (
   $api_v2_enabled                 = $::os_service_default,
   $allow_tls_terminated_listeners = $::os_service_default,
   $sync_db                        = false,
+  $enable_proxy_headers_parsing   = $::os_service_default,
   $default_provider_driver        = $::os_service_default,
   $provider_drivers               = $::os_service_default,
   # DEPRECATED PARAMETERS
@@ -150,4 +156,8 @@ class octavia::api (
     'api_settings/default_provider_driver':        value => $default_provider_driver;
     'api_settings/enabled_provider_drivers':       value => $provider_drivers;
   }
+
+  oslo::middleware { 'octavia_config':
+    enable_proxy_headers_parsing => $enable_proxy_headers_parsing
+  }
 }

releasenotes/notes/add-api-enable_proxy_headers_parsing-e04ae349155978bc.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``octavia::api::enable_proxy_headers_parsing`` parameter was added
+    to support ``enable_proxy_headers_parsing`` parameter in Octavia.

spec/classes/octavia_api_spec.rb

@@ -53,6 +53,9 @@ describe 'octavia::api' do
         is_expected.to contain_octavia_config('api_settings/allow_tls_terminated_listeners').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('api_settings/default_provider_driver').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_octavia_config('api_settings/enabled_provider_drivers').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_oslo__middleware('octavia_config').with(
+          :enable_proxy_headers_parsing => '<SERVICE DEFAULT>',
+        )
       end
       it 'does not sync the database' do
         is_expected.not_to contain_class('octavia::db::sync')
@@ -99,6 +102,18 @@ describe 'octavia::api' do
       it { is_expected.to contain_class('octavia::db::sync') }
     end
 
+    context 'with enable_proxy_headers_parsing set' do
+      before do
+        params.merge!({
+          :enable_proxy_headers_parsing => true})
+      end
+      it 'configures enable_proxy_headers_parsing' do
+        is_expected.to contain_oslo__middleware('octavia_config').with(
+          :enable_proxy_headers_parsing => true,
+        )
+      end
+    end
+
     context 'with disabled service managing' do
       before do
         params.merge!({