Only show OpenID links if their keys have been set.

README.md

@@ -48,8 +48,23 @@ http://localhost:3000
 10. Use openID
 In order to use the OpenID feature you need to register your application with the providers
 (Google and Facebook) and enter their API keys in config/secrets.yml file, changing the existing sample values.
+
 You can register as a devoloper with Google from https://code.google.com/apis/console#:access
-You can register as a devoloper with Facebook from https://developers.facebook.com/
+You can register as a devoloper with Facebook from https://developers.facebook.com/,
+by selecting from the top menu the option 'Apps' -> 'Create a New App'
+
+Unless you add the key and secret for each provider, you will not be able to see the image that
+redirects to the login page of the provider.
+
+If you add a provider that does not require developers to register their application, you still need
+to create two (2) variables, in config/secrets.yml
+with the format of providername_key and providername_secret and add some sample text as their values.
+Example:
+myprovider_key = 'sample data'
+myprovider_secret = 'sample data'
+
+That is required so that the check in app/views/devise/shared/_openid.html.haml will pass and
+the image-link to login using the provider will be shown.
 
 ### Run OSEM in production
 We recommend to run OSEM in production with [mod_passenger](https://www.phusionpassenger.com/download/#open_source)

app/views/devise/shared/_openid.html.haml

@@ -1,4 +1,7 @@
 - if devise_mapping.omniauthable?
   - resource_class.omniauth_providers.each do |provider|
+    - provider_key = "#{provider}_key"
+    - provider_secret = "#{provider}_secret"
+    - unless Rails.application.secrets.send(provider_key).blank? || Rails.application.secrets.send(provider_secret).blank?
       = link_to image_tag("#{provider}.png", size: '32x32') + provider , omniauth_authorize_path(resource_name, provider)
       %br

config/secrets.yml.example

@@ -10,11 +10,26 @@ defaults: &defaults
   # Your errbit API key
   # errbit_key: '12345'
 
-  google_key: 'changeme'
-  google_secret: 'changeme'
+  # Leave the variables' names empty, unless you use the providers, in which case you need to
+  # register your applicaton and add the actual keys.
 
-  facebook_key: 'changeme'
-  facebook_secret: 'changeme'
+  # If you add more providers, keep the format of the variables: provider_key, provider_secret
+
+  # Register your appllication with Google from https://code.google.com/apis/console#:access
+  google_key: ''
+  google_secret: ''
+
+  # Register your application with Facebook from https://developers.facebook.com/
+  facebook_key: ''
+  facebook_secret: ''
+
+  # Developers do not need to register their application for novell account to work.
+  # You must, however, leave the sample data there, for the login option to appear.
+
+  novell_key: 'sample data'
+  novell_secret: 'sample data'
+
+  # If you add more providers that do not require a key, you still have to create the 2 variables with sample data
 
 development:
   <<: *defaults