FIX: Include auth_providers for anonymous users when login_required

app/models/site.rb

@@ -91,6 +91,9 @@ class Site
         filters: Discourse.filters.map(&:to_s),
         user_fields: UserField.all.map do |userfield|
           UserFieldSerializer.new(userfield, root: false, scope: guardian)
+        end,
+        auth_providers: Discourse.enabled_auth_providers.map do |provider|
+          AuthProviderSerializer.new(provider, root: false, scope: guardian)
         end
       }.to_json
     end

spec/models/site_spec.rb

@@ -69,7 +69,16 @@ describe Site do
   it "includes all enabled authentication providers" do
     SiteSetting.enable_twitter_logins = true
     SiteSetting.enable_facebook_logins = true
-    expect(Site.new(Guardian.new).auth_providers.map(&:name)).to contain_exactly('facebook', 'twitter')
+    data = JSON.parse(Site.json_for(Guardian.new))
+    expect(data["auth_providers"].map { |a| a["name"] }).to contain_exactly('facebook', 'twitter')
+  end
+
+  it "includes all enabled authentication providers for anon when login_required" do
+    SiteSetting.login_required = true
+    SiteSetting.enable_twitter_logins = true
+    SiteSetting.enable_facebook_logins = true
+    data = JSON.parse(Site.json_for(Guardian.new))
+    expect(data["auth_providers"].map { |a| a["name"] }).to contain_exactly('facebook', 'twitter')
   end
 
 end