Add explicit configuration support for Akismet

The Akismet spam detection feature can be configured through a
settings page, but in order to be able to keep the API key private
(in hiera) we need to be able to set it through configuration
management instead.

Change-Id: Ie64ece3e84af407b5e4124c874f59dad5ab23d4e

manifests/config.pp

@@ -7,6 +7,7 @@
 class askbot::config (
   $db_password,
   $redis_password,
+  $akismet_api_key              = undef,
   $askbot_debug                 = false,
   $custom_theme_enabled         = false,
   $custom_theme_name            = undef,

manifests/init.pp

@@ -57,6 +57,7 @@
 class askbot (
   $db_password,
   $redis_password,
+  $akismet_api_key              = undef,
   $askbot_branch                = 'master',
   $askbot_debug                 = false,
   $askbot_ensure                = 'present',
@@ -155,6 +156,7 @@ class askbot (
     redis_max_memory             => $redis_max_memory,
     redis_bind                   => $redis_bind,
     redis_password               => $redis_password,
+    akismet_api_key              => $akismet_api_key,
     site_ssl_enabled             => $site_ssl_enabled,
     site_ssl_cert_file_contents  => $site_ssl_cert_file_contents,
     site_ssl_key_file_contents   => $site_ssl_key_file_contents,

manifests/site/config.pp

@@ -21,6 +21,7 @@ class askbot::site::config (
   $smtp_port,
   $solr_enabled,
   $template_settings,
+  $akismet_api_key = undef,
 ) {
 
   case $db_provider {

templates/settings.py.erb

@@ -94,6 +94,11 @@ ADMIN_MEDIA_PREFIX = STATIC_URL + 'admin/'
 # Make up some unique string, and don't share it with anybody.
 SECRET_KEY = '44fb9b7219e3743bffabb6861cbc9a28'
 
+<% if @akismet_api_key != nil -%>
+# To help mitigate spam, Akismet integration needs the API key for your account
+AKISMET_API_KEY = '<%= @akismet_api_key %>'
+<% end -%>
+
 # List of callables that know how to import templates from various sources.
 TEMPLATE_LOADERS = (
     'askbot.skins.loaders.Loader',