Add support for Wikimedia authentication

Closes #1146

config/example.application.yml

@@ -107,6 +107,8 @@ defaults: &defaults
   #windowslive_auth_secret: ""
   #github_auth_id: ""
   #github_auth_secret: ""
+  #wikipedia_auth_id: ""
+  #wikipedia_auth_secret: ""
   # MapQuest authentication details
   #mapquest_key: ""
   # Mapzen authentication details
@@ -134,3 +136,5 @@ test:
   windowslive_auth_secret: "dummy"
   github_auth_id: "dummy"
   github_auth_secret: "dummy"
+  wikipedia_auth_id: "dummy"
+  wikipedia_auth_secret: "dummy"

config/initializers/omniauth.rb

@@ -24,6 +24,7 @@ google_options = { :name => "google", :scope => "email", :access_type => "online
 facebook_options = { :name => "facebook", :scope => "email" }
 windowslive_options = { :name => "windowslive", :scope => "wl.signin,wl.emails" }
 github_options = { :name => "github", :scope => "user:email" }
+wikipedia_options = { :name => "wikipedia", :client_options => { :site => "https://commons.wikimedia.org" } }
 
 if defined?(GOOGLE_OPENID_REALM)
   google_options[:openid_realm] = GOOGLE_OPENID_REALM
@@ -35,6 +36,7 @@ Rails.application.config.middleware.use OmniAuth::Builder do
   provider :facebook, FACEBOOK_AUTH_ID, FACEBOOK_AUTH_SECRET, facebook_options if defined?(FACEBOOK_AUTH_ID)
   provider :windowslive, WINDOWSLIVE_AUTH_ID, WINDOWSLIVE_AUTH_SECRET, windowslive_options if defined?(WINDOWSLIVE_AUTH_ID)
   provider :github, GITHUB_AUTH_ID, GITHUB_AUTH_SECRET, github_options if defined?(GITHUB_AUTH_ID)
+  provider :mediawiki, WIKIPEDIA_AUTH_ID, WIKIPEDIA_AUTH_SECRET, wikipedia_options if defined?(WIKIPEDIA_AUTH_ID)
 end
 
 # Pending fix for: https://github.com/intridea/omniauth/pull/795

config/locales/en.yml

@@ -1746,6 +1746,9 @@ en:
         github:
           title: Login with GitHub
           alt: Login with a GitHub Account
+        wikipedia:
+          title: Login with Wikipedia
+          alt: Login with a Wikipedia Account
         yahoo:
           title: Login with Yahoo
           alt: Login with a Yahoo OpenID