feat: Support for Whatsapp Cloud API (#4938)

Ability to configure Whatsapp Cloud API Inboxes

fixes: #4712

app/controllers/concerns/meta_token_verify_concern.rb

@@ -0,0 +1,20 @@
+# services from Meta (Prev: Facebook) needs a token verification step for webhook subscriptions,
+# This concern handles the token verification step.
+
+module MetaTokenVerifyConcern
+  def verify
+    service = is_a?(Webhooks::WhatsappController) ? 'whatsapp' : 'instagram'
+    if valid_token?(params['hub.verify_token'])
+      Rails.logger.info("#{service.capitalize} webhook verified")
+      render json: params['hub.challenge']
+    else
+      render status: :unauthorized, json: { error: 'Error; wrong verify token' }
+    end
+  end
+
+  private
+
+  def valid_token?(_token)
+    raise 'Overwrite this method your controller'
+  end
+end

app/controllers/webhooks/instagram_controller.rb

@@ -1,15 +1,5 @@
-class Webhooks::InstagramController < ApplicationController
-  skip_before_action :authenticate_user!, raise: false
-  skip_before_action :set_current_user
-
-  def verify
-    if valid_instagram_token?(params['hub.verify_token'])
-      Rails.logger.info('Instagram webhook verified')
-      render json: params['hub.challenge']
-    else
-      render json: { error: 'Error; wrong verify token', status: 403 }
-    end
-  end
+class Webhooks::InstagramController < ActionController::API
+  include MetaTokenVerifyConcern
 
   def events
     Rails.logger.info('Instagram webhook received events')
@@ -24,7 +14,7 @@ class Webhooks::InstagramController < ApplicationController
 
   private
 
-  def valid_instagram_token?(token)
+  def valid_token?(token)
     token == GlobalConfigService.load('IG_VERIFY_TOKEN', '')
   end
 end

app/controllers/webhooks/whatsapp_controller.rb

@@ -1,6 +1,16 @@
 class Webhooks::WhatsappController < ActionController::API
+  include MetaTokenVerifyConcern
+
   def process_payload
     Webhooks::WhatsappEventsJob.perform_later(params.to_unsafe_hash)
     head :ok
   end
+
+  private
+
+  def valid_token?(token)
+    channel = Channel::Whatsapp.find_by(phone_number: params[:phone_number])
+    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
 end