Expose headers option of apache::vhost

The headers option in apache::vhost is required in some case, for
example when adding the X-XSS-Protection header. This change allows
customizing the option for the api vhost.

This change also adds support for request_headers so that both request
headers and response headers can customized.

Change-Id: Ie5f2669a8686a3546b652251881615e0e18bf433

manifests/wsgi/apache.pp

@@ -86,6 +86,14 @@
 #     { python-path => '/my/python/virtualenv' }
 #     Defaults to {}
 #
+#   [*headers*]
+#     (optional) Headers for the vhost.
+#     Defaults to undef
+#
+#   [*request_headers*]
+#     (optional) Modifies collected request headers in various ways.
+#     Defaults to undef
+#
 # == Dependencies
 #
 #   requires Class['apache'] & Class['zaqar']
@@ -117,6 +125,8 @@ class zaqar::wsgi::apache (
   $access_log_format           = false,
   $error_log_file              = undef,
   $custom_wsgi_process_options = {},
+  $headers                     = undef,
+  $request_headers             = undef,
 ) {
 
   include zaqar::deps
@@ -148,6 +158,8 @@ class zaqar::wsgi::apache (
     wsgi_script_dir             => $::zaqar::params::zaqar_wsgi_script_path,
     wsgi_script_file            => 'zaqar-server',
     wsgi_script_source          => $::zaqar::params::zaqar_wsgi_script_source,
+    headers                     => $headers,
+    request_headers             => $request_headers,
     vhost_custom_fragment       => 'WSGICallableObject app',
     access_log_file             => $access_log_file,
     access_log_format           => $access_log_format,

releasenotes/notes/apache-headers-80960700e9e63f0f.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The ``zaqar::wsgi::apache`` class now supports customizing
+    request/response headers added by apache.

spec/classes/zaqar_wsgi_apache_spec.rb

@@ -40,6 +40,8 @@ describe 'zaqar::wsgi::apache' do
           :custom_wsgi_process_options => {
             'python_path' => '/my/python/path',
           },
+          :headers                     => ['set X-XSS-Protection "1; mode=block"'],
+          :request_headers             => ['set Content-Type "application/json"'],
         }
       end
       it { is_expected.to contain_class('zaqar::params') }
@@ -59,12 +61,14 @@ describe 'zaqar::wsgi::apache' do
         :wsgi_script_dir             => platform_params[:wsgi_script_path],
         :wsgi_script_file            => 'zaqar-server',
         :wsgi_script_source          => platform_params[:wsgi_script_source],
-        :access_log_file             => '/var/log/httpd/access_log',
-        :access_log_format           => 'some format',
-        :error_log_file              => '/var/log/httpd/error_log',
+        :headers                     => ['set X-XSS-Protection "1; mode=block"'],
+        :request_headers             => ['set Content-Type "application/json"'],
         :custom_wsgi_process_options => {
           'python_path' => '/my/python/path',
         },
+        :access_log_file             => '/var/log/httpd/access_log',
+        :access_log_format           => 'some format',
+        :error_log_file              => '/var/log/httpd/error_log',
       )}
     end
   end