[Feature] Website live chat (#187)

Co-authored-by: Nithin David Thomas <webofnithin@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/controllers/widgets_controller.rb

@@ -0,0 +1,47 @@
+class WidgetsController < ActionController::Base
+  before_action :set_web_widget
+  before_action :set_contact
+  before_action :build_contact
+
+  private
+
+  def set_web_widget
+    @web_widget = ::Channel::WebWidget.find_by!(website_token: permitted_params[:website_token])
+  end
+
+  def set_contact
+    return if cookie_params[:source_id].nil?
+
+    contact_inbox = ::ContactInbox.find_by(
+      inbox_id: @web_widget.inbox.id,
+      source_id: cookie_params[:source_id]
+    )
+
+    @contact = contact_inbox.contact
+  end
+
+  def build_contact
+    return if @contact.present?
+
+    contact_inbox = @web_widget.create_contact_inbox
+    @contact = contact_inbox.contact
+
+    cookies.signed[cookie_name] = JSON.generate(
+      source_id: contact_inbox.source_id,
+      contact_id: @contact.id,
+      inbox_id: @web_widget.inbox.id
+    ).to_s
+  end
+
+  def cookie_params
+    cookies.signed[cookie_name] ? JSON.parse(cookies.signed[cookie_name]).symbolize_keys : {}
+  end
+
+  def permitted_params
+    params.permit(:website_token)
+  end
+
+  def cookie_name
+    'cw_conversation_' + permitted_params[:website_token]
+  end
+end