Configure OSEM via environment variables

Instead of reading a yaml file we get configuration from the
environment.

config/environments/development.rb

@@ -35,7 +35,10 @@ Osem::Application.configure do
   config.eager_load = false
 
   # Set the detault url for action mailer
-  config.action_mailer.default_url_options = { host: CONFIG['url_for_emails'] }
+  config.action_mailer.default_url_options = { host: (ENV['OSEM_HOSTNAME'] || 'localhost:3000') }
+
+  # Set the secret key base if it's not set via other means
+  config.secret_key_base ||= 'f4be765bc98e516de82ac01daa8f8aa11c5ca13cb6c911887851ac89457b6c0b056b2361a21b5c08926c9386e0f91eef84fc0b103d522bf00bc0c78ea8ce7c58'
 
   # Use omniauth mock credentials
   OmniAuth.config.test_mode = true

config/environments/production.rb

@@ -67,7 +67,7 @@ Osem::Application.configure do
   config.active_support.deprecation = :notify
 
   # Set the detault url for action mailer
-  config.action_mailer.default_url_options = { host: CONFIG['url_for_emails'] }
+  config.action_mailer.default_url_options = { host: (ENV['OSEM_HOSTNAME'] || 'localhost:3000') }
 
   # Set the smtp configuration of your service provider
   # For further details of each configuration checkout: http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
@@ -78,4 +78,7 @@ Osem::Application.configure do
     password:             CONFIG['MAIL_PASSWORD'],
     authentication:       CONFIG['MAIL_AUTHENTICATION']
   }
+
+  # Set the secret_key_base from the env, if not set by any other means
+  config.secret_key_base ||= ENV["SECRET_KEY_BASE"]
 end

config/initializers/devise.rb

@@ -2,24 +2,21 @@
 # Many of these configuration options can be set straight in your model.
 
 Devise.setup do |config|
-  # ==> Secret key, generate one with `rake secret`
-  config.secret_key = Rails.application.secrets.devise_secret_key
-
   # ==> openIDs configuration
   # Define the available openID providers that can be used to log in
   # Pass each provider to User model in :omniauth_providers (for open_id providers use their name)
 
   config.omniauth :open_id, name: 'suse', identifier: 'http://www.opensuse.org/openid/user'
-  config.omniauth :google_oauth2, Rails.application.secrets.google_key, Rails.application.secrets.google_secret,
+  config.omniauth :google_oauth2, (ENV['OSEM_GOOGLE_KEY'] || Rails.application.secrets.google_key), (ENV['OSEM_GOOGLE_SECRET'] || Rails.application.secrets.google_secret),
                   name: 'google',
                   scope: 'email'
-  config.omniauth :facebook, Rails.application.secrets.facebook_key, Rails.application.secrets.facebook_secret
-  config.omniauth :github, Rails.application.secrets.github_key, Rails.application.secrets.github_secret
+  config.omniauth :facebook, (ENV['OSEM_FACEBOOK_KEY'] || Rails.application.secrets.facebook_key), (ENV['OSEM_FACEBOOK_SECRET'] || Rails.application.secrets.facebook_secret)
+  config.omniauth :github, (ENV['OSEM_GITHUB_KEY'] || Rails.application.secrets.github_key), (ENV['OSEM_GITHUB_SECRET'] || Rails.application.secrets.github_secret)
 
   # ==> Mailer Configuration
   # Configure the e-mail address which will be shown in Devise::Mailer,
   # note that it will be overwritten if you use your own mailer class with default "from" parameter.
-  config.mailer_sender = CONFIG['sender_for_emails']
+  config.mailer_sender = ENV['OSEM_EMAIL_ADDRESS'] || 'no-reply@localhost'
 
   # Configure the class responsible to send e-mails.
   # config.mailer = "Devise::Mailer"

config/initializers/hoptoad.rb

@@ -1,7 +1,7 @@
 HoptoadNotifier.configure do |config|
   # Change this to some sensible data for your errbit instance
-  config.api_key = Rails.application.secrets.errbit_key || ''
-  config.host    = Rails.application.secrets.errbit_host || ''
+  config.api_key = ENV['OSEM_ERRBIT_APIKEY'] || Rails.application.secrets.errbit_key || ''
+  config.host    = ENV['OSEM_ERRBIT_HOST']
   if config.api_key.blank? || config.host.blank?
     config.development_environments = 'production development test'
   else

config/routes.rb

@@ -1,6 +1,6 @@
 Osem::Application.routes.draw do
 
-  if CONFIG['authentication']['ichain']['enabled']
+  if ENV['OSEM_ICHAIN_ENABLED'] == 'true'
     devise_for :users, controllers: { registrations: :registrations }
   else
     devise_for :users,