hide oauth login when not configured

app/helpers/application_helper.rb

@@ -14,4 +14,16 @@ module ApplicationHelper
     end
     translations[:client]
   end
+
+  def omniauth_providers_configured(provider = nil)
+    if provider
+      Rails.configuration.send("omniauth_#{provider}")
+    else
+      providers = []
+      Rails.configuration.providers.each do |provider|
+        providers.push(provider) if Rails.configuration.send("omniauth_#{provider}")
+      end
+      providers
+    end
+  end
 end

app/views/layouts/application.html.erb

@@ -32,14 +32,20 @@
           <%= t('are_you', name: @user.username) %> |
           <%= link_to t('login'), "/auth/#{@user.provider}" %>
         <% else %>
-          <span class="signup-description hidden-xs">
-            <%= t('oauth_signup') %>
-          </span>
-          <%= link_to('/auth/twitter', :class => "btn icon btn-lg btn-social-icon btn-twitter") do %>
-            <span class="fa fa-twitter"></span>
+          <% if omniauth_providers_configured.present? %>
+            <span class="signup-description hidden-xs">
+              <%= t('oauth_signup') %>
+            </span>
           <% end %>
-          <%= link_to('/auth/google', :class => "btn icon btn-lg btn-social-icon btn-google") do %>
-            <span class="fa fa-google"></span>
+          <% if omniauth_providers_configured(:twitter) %>
+            <%= link_to('/auth/twitter', :class => "btn icon btn-lg btn-social-icon btn-twitter") do %>
+              <span class="fa fa-twitter"></span>
+            <% end %>
+          <% end %>
+          <% if omniauth_providers_configured(:google) %>
+            <%= link_to('/auth/google', :class => "btn icon btn-lg btn-social-icon btn-google") do %>
+              <span class="fa fa-google"></span>
+            <% end %>
           <% end %>
         <% end %>
       </span>

config/initializers/omniauth.rb

@@ -1,3 +1,9 @@
+Rails.application.config.providers = [:google, :twitter]
+
+Rails.application.config.omniauth_google = ENV['GOOGLE_OAUTH2_ID'].present?
+
+Rails.application.config.omniauth_twitter = ENV['TWITTER_ID'].present?
+
 Rails.application.config.middleware.use OmniAuth::Builder do
   provider :twitter, ENV['TWITTER_ID'], ENV['TWITTER_SECRET']
   provider :google_oauth2, ENV['GOOGLE_OAUTH2_ID'], ENV['GOOGLE_OAUTH2_SECRET'],