Chore: Convert Message Sender to polymorphic (#740)

Fixes #680

lib/integrations/slack/incoming_message_builder.rb

@@ -82,7 +82,7 @@ class Integrations::Slack::IncomingMessageBuilder
       content: params[:event][:text],
       source_id: "slack_#{params[:event][:ts]}",
       private: private_note?,
-      user: sender
+      sender: sender
     )
 
     { status: 'success' }

lib/integrations/slack/send_on_slack_service.rb

@@ -20,10 +20,6 @@ class Integrations::Slack::SendOnSlackService < Base::SendOnChannelService
     update_reference_id
   end
 
-  def agent
-    @agent ||= message.user
-  end
-
   def message_content
     private_indicator = message.private? ? 'private: ' : ''
     if conversation.identifier.present?
@@ -38,7 +34,7 @@ class Integrations::Slack::SendOnSlackService < Base::SendOnChannelService
   end
 
   def send_message
-    sender = message.outgoing? ? agent : contact
+    sender = message.sender
     sender_type = sender.class == Contact ? 'Contact' : 'Agent'
 
     @slack_message = slack_client.chat_postMessage(

lib/integrations/widget/incoming_message_builder.rb

@@ -51,7 +51,8 @@ class Integrations::Widget::IncomingMessageBuilder
       account_id: conversation.account_id,
       inbox_id: conversation.inbox_id,
       message_type: 0,
-      content: options[:content]
+      content: options[:content],
+      sender: contact
     }
   end
 end

lib/integrations/widget/outgoing_message_builder.rb

@@ -46,7 +46,7 @@ class Integrations::Widget::OutgoingMessageBuilder
       inbox_id: @conversation.inbox_id,
       message_type: 1,
       content: options[:content],
-      user_id: user.id
+      sender: user
     }
   end
 end