feat: Add event subscription option to webhooks (#4540)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/models/webhook.rb

@@ -2,13 +2,14 @@
 #
 # Table name: webhooks
 #
-#  id           :bigint           not null, primary key
-#  url          :string
-#  webhook_type :integer          default("account")
-#  created_at   :datetime         not null
-#  updated_at   :datetime         not null
-#  account_id   :integer
-#  inbox_id     :integer
+#  id            :bigint           not null, primary key
+#  subscriptions :jsonb
+#  url           :string
+#  webhook_type  :integer          default("account")
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#  account_id    :integer
+#  inbox_id      :integer
 #
 # Indexes
 #
@@ -21,6 +22,18 @@ class Webhook < ApplicationRecord
 
   validates :account_id, presence: true
   validates :url, uniqueness: { scope: [:account_id] }, format: URI::DEFAULT_PARSER.make_regexp(%w[http https])
-
+  validate :validate_webhook_subscriptions
   enum webhook_type: { account: 0, inbox: 1 }
+
+  ALLOWED_WEBHOOK_EVENTS = %w[conversation_status_changed conversation_updated conversation_created message_created message_updated
+                              webwidget_triggered].freeze
+
+  private
+
+  def validate_webhook_subscriptions
+    invalid_subscriptions = !subscriptions.instance_of?(Array) ||
+                            subscriptions.blank? ||
+                            (subscriptions.uniq - ALLOWED_WEBHOOK_EVENTS).length.positive?
+    errors.add(:subscriptions, I18n.t('errors.webhook.invalid')) if invalid_subscriptions
+  end
 end