More extension points for login buttons, used by OAuth2 plugin

lib/plugin/auth_provider.rb

@@ -1,9 +1,25 @@
 class Plugin::AuthProvider
-  attr_accessor :glyph, :background_color, :title,
-                :message, :frame_width, :frame_height, :authenticator
+
+  def self.auth_attributes
+    [:glyph, :background_color, :title, :message, :frame_width, :frame_height, :authenticator,
+     :title_setting, :enabled_setting]
+  end
+
+  attr_accessor(*auth_attributes)
 
   def name
     authenticator.name
   end
 
+  def to_json
+    result = {name: name}
+    result['titleOverride'] = title if title
+    result['titleSetting'] = title_setting if title_setting
+    result['enabledSetting'] = enabled_setting if enabled_setting
+    result['messageOverride'] = message if message
+    result['frameWidth'] = frame_width if frame_width
+    result['frameHeight'] = frame_height if frame_height
+    result.to_json
+  end
+
 end

lib/plugin/instance.rb

@@ -218,13 +218,8 @@ class Plugin::Instance
     js = javascripts.join("\n")
 
     auth_providers.each do |auth|
-      overrides = ""
-      overrides = ", titleOverride: '#{auth.title}'" if auth.title
-      overrides << ", messageOverride: '#{auth.message}'" if auth.message
-      overrides << ", frameWidth: '#{auth.frame_width}'" if auth.frame_width
-      overrides << ", frameHeight: '#{auth.frame_height}'" if auth.frame_height
 
-      js << "Discourse.LoginMethod.register(Discourse.LoginMethod.create({name: '#{auth.name}'#{overrides}}));\n"
+      js << "Discourse.LoginMethod.register(Discourse.LoginMethod.create(#{auth.to_json}));\n"
 
       if auth.glyph
         css << ".btn-social.#{auth.name}:before{ content: '#{auth.glyph}'; }\n"
@@ -305,7 +300,8 @@ class Plugin::Instance
 
   def auth_provider(opts)
     provider = Plugin::AuthProvider.new
-    [:glyph, :background_color, :title, :message, :frame_width, :frame_height, :authenticator].each do |sym|
+
+    Plugin::AuthProvider.auth_attributes.each do |sym|
       provider.send "#{sym}=", opts.delete(sym)
     end
     auth_providers << provider