Add liquid support

app/drops/contact_drop.rb

@@ -0,0 +1,9 @@
+class ContactDrop < BaseDrop
+  def email
+    @obj.try(:email)
+  end
+
+  def phone_number
+    @obj.try(:phone_number)
+  end
+end

app/models/message.rb

@@ -35,6 +35,7 @@ class Message < ApplicationRecord
   NUMBER_OF_PERMITTED_ATTACHMENTS = 15
 
   before_validation :ensure_content_type
+  before_create :process_liquid_in_content
 
   validates :account_id, presence: true
   validates :inbox_id, presence: true
@@ -147,6 +148,19 @@ class Message < ApplicationRecord
     data
   end
 
+  def process_liquid_in_content
+    return if content.blank?
+
+    template = Liquid::Template.parse(content)
+
+    self.content = template.render({
+                                     'contact' => ContactDrop.new(conversation.contact),
+                                     'agent' => UserDrop.new(Current.user),
+                                     'conversation' => ConversationDrop.new(conversation),
+                                     'inbox' => InboxDrop.new(inbox)
+                                   })
+  end
+
   def content
     # move this to a presenter
     return self[:content] if !input_csat? || inbox.web_widget?