chore: Logger for non-existent WhatsApp channels (#11064)

- Add a warning logger for cases where we are getting webhook events for
inactive numbers.
- Add config to discard events for inactive numbers so that the meta
will stop sending events

---------

Co-authored-by: Pranav <pranav@chatwoot.com>

app/controllers/webhooks/whatsapp_controller.rb

@@ -2,6 +2,12 @@ class Webhooks::WhatsappController < ActionController::API
   include MetaTokenVerifyConcern
 
   def process_payload
+    if inactive_whatsapp_number?
+      Rails.logger.warn("Rejected webhook for inactive WhatsApp number: #{params[:phone_number]}")
+      render json: { error: 'Inactive WhatsApp number' }, status: :unprocessable_entity
+      return
+    end
+
     Webhooks::WhatsappEventsJob.perform_later(params.to_unsafe_hash)
     head :ok
   end
@@ -13,4 +19,15 @@ class Webhooks::WhatsappController < ActionController::API
     whatsapp_webhook_verify_token = channel.provider_config['webhook_verify_token'] if channel.present?
     token == whatsapp_webhook_verify_token if whatsapp_webhook_verify_token.present?
   end
+
+  def inactive_whatsapp_number?
+    phone_number = params[:phone_number]
+    return false if phone_number.blank?
+
+    inactive_numbers = GlobalConfig.get_value('INACTIVE_WHATSAPP_NUMBERS').to_s
+    return false if inactive_numbers.blank?
+
+    inactive_numbers_array = inactive_numbers.split(',').map(&:strip)
+    inactive_numbers_array.include?(phone_number)
+  end
 end

app/jobs/webhooks/whatsapp_events_job.rb

@@ -3,7 +3,11 @@ class Webhooks::WhatsappEventsJob < ApplicationJob
 
   def perform(params = {})
     channel = find_channel_from_whatsapp_business_payload(params)
-    return if channel_is_inactive?(channel)
+
+    if channel_is_inactive?(channel)
+      Rails.logger.warn("Inactive WhatsApp channel: #{channel&.phone_number || "unknown - #{params[:phone_number]}"}")
+      return
+    end
 
     case channel.provider
     when 'whatsapp_cloud'