chore: Rotate pubsub token on password change (#7194)

Fixes: https://linear.app/chatwoot/issue/CW-1350/

app/models/concerns/pubsubable.rb

@@ -6,6 +6,16 @@ module Pubsubable
   included do
     # Used by the actionCable/PubSub Service we use for real time communications
     has_secure_token :pubsub_token
+    before_save :rotate_pubsub_token
+  end
+
+  def rotate_pubsub_token
+    # ATM we are only rotating the token if the user is changing their password
+    return unless is_a?(User)
+
+    # Using the class method to avoid the extra Save
+    # TODO: Should we do this on signin ?
+    self.pubsub_token = self.class.generate_unique_secure_token if will_save_change_to_encrypted_password?
   end
 
   def pubsub_token

spec/models/user_spec.rb

@@ -34,6 +34,22 @@ RSpec.describe User do
 
     it { expect(user.pubsub_token).not_to be_nil }
     it { expect(user.saved_changes.keys).not_to eq('pubsub_token') }
+
+    context 'rotates the pubsub_token' do
+      it 'changes the pubsub_token when password changes' do
+        pubsub_token = user.pubsub_token
+        user.password = Faker::Internet.password(special_characters: true)
+        user.save!
+        expect(user.pubsub_token).not_to eq(pubsub_token)
+      end
+
+      it 'will not change pubsub_token when other attributes change' do
+        pubsub_token = user.pubsub_token
+        user.name = Faker::Name.name
+        user.save!
+        expect(user.pubsub_token).to eq(pubsub_token)
+      end
+    end
   end
 
   describe 'hmac_identifier' do