Add an option to not automatically sign in a user after changing a password

app/controllers/devise/registrations_controller.rb

@@ -50,12 +50,9 @@ def update
     resource_updated = update_resource(resource, account_update_params)
     yield resource if block_given?
     if resource_updated
-      if is_flashing_format?
-        flash_key = update_needs_confirmation?(resource, prev_unconfirmed_email) ?
-          :update_needs_confirmation : :updated
-        set_flash_message :notice, flash_key
-      end
-      bypass_sign_in resource, scope: resource_name
+      set_flash_message_for_update(resource, prev_unconfirmed_email)
+      bypass_sign_in resource, scope: resource_name if sign_in_after_change_password?
+
       respond_with resource, location: after_update_path_for(resource)
     else
       clean_up_passwords resource
@@ -127,7 +124,7 @@ def after_inactive_sign_up_path_for(resource)
   # The default url to be used after updating a resource. You need to overwrite
   # this method in your own RegistrationsController.
   def after_update_path_for(resource)
-    signed_in_root_path(resource)
+    sign_in_after_change_password? ? signed_in_root_path(resource) : new_session_path(resource_name)
   end
 
   # Authenticates the current scope and gets the current resource from the session.
@@ -147,4 +144,25 @@ def account_update_params
   def translation_scope
     'devise.registrations'
   end
+
+  private
+
+  def set_flash_message_for_update(resource, prev_unconfirmed_email)
+    return unless is_flashing_format?
+
+    flash_key = if update_needs_confirmation?(resource, prev_unconfirmed_email)
+                  :update_needs_confirmation
+                elsif sign_in_after_change_password?
+                  :updated
+                else
+                  :updated_but_not_signed_in
+                end
+    set_flash_message :notice, flash_key
+  end
+
+  def sign_in_after_change_password?
+    return true if account_update_params[:password].blank?
+
+    Devise.sign_in_after_change_password
+  end
 end

config/locales/en.yml

@@ -44,6 +44,7 @@ en:
       signed_up_but_unconfirmed: "A message with a confirmation link has been sent to your email address. Please follow the link to activate your account."
       update_needs_confirmation: "You updated your account successfully, but we need to verify your new email address. Please check your email and follow the confirm link to confirm your new email address."
       updated: "Your account has been updated successfully."
+      updated_but_not_signed_in: "Your account has been updated successfully, but since your password was changed, you need to sign in again"
     sessions:
       signed_in: "Signed in successfully."
       signed_out: "Signed out successfully."

lib/devise.rb

@@ -293,6 +293,10 @@ module Test
   mattr_accessor :token_generator
   @@token_generator = nil
 
+  # When set to false, changing a password does not automatically sign in a user
+  mattr_accessor :sign_in_after_change_password
+  @@sign_in_after_change_password = true
+
   def self.rails51? # :nodoc:
     Rails.gem_version >= Gem::Version.new("5.1.x")
   end

lib/devise/models/registerable.rb

@@ -21,6 +21,8 @@ module ClassMethods
         def new_with_session(params, session)
           new(params)
         end
+
+        Devise::Models.config(self, :sign_in_after_change_password)
       end
     end
   end

lib/generators/templates/devise.rb

@@ -9,7 +9,7 @@
   # Devise will use the `secret_key_base` as its `secret_key`
   # by default. You can change it below and use your own secret key.
   # config.secret_key = '<%= SecureRandom.hex(64) %>'
-  
+
   # ==> Controller configuration
   # Configure the parent class to the devise controllers.
   # config.parent_controller = 'DeviseController'
@@ -290,4 +290,10 @@
   # ActiveSupport.on_load(:devise_failure_app) do
   #   include Turbolinks::Controller
   # end
+
+  # ==> Configuration for :registerable
+
+  # When set to false, does not sign a user in automatically after their password is
+  # changed. Defaults to true, so a user is signed in automatically after changing a password.
+  # config.sign_in_after_change_password = true
 end

test/integration/registerable_test.rb

@@ -179,6 +179,39 @@ def user_sign_up
     assert warden.authenticated?(:user)
   end
 
+  test 'a signed in user should not be able to use the website after changing their password if config.sign_in_after_change_password is false' do
+    swap Devise, sign_in_after_change_password: false do
+      sign_in_as_user
+      get edit_user_registration_path
+
+      fill_in 'password', with: '1234567890'
+      fill_in 'password confirmation', with: '1234567890'
+      fill_in 'current password', with: '12345678'
+      click_button 'Update'
+
+      assert_contain 'Your account has been updated successfully, but since your password was changed, you need to sign in again'
+      assert_equal new_user_session_path, @request.path
+      refute warden.authenticated?(:user)
+    end
+  end
+
+  test 'a signed in user should be able to use the website after changing its email with config.sign_in_after_change_password is false' do
+    swap Devise, sign_in_after_change_password: false do
+      sign_in_as_user
+      get edit_user_registration_path
+
+      fill_in 'email', with: 'user.new@example.com'
+      fill_in 'current password', with: '12345678'
+      click_button 'Update'
+
+      assert_current_url '/'
+      assert_contain 'Your account has been updated successfully.'
+
+      assert warden.authenticated?(:user)
+      assert_equal "user.new@example.com", User.to_adapter.find_first.email
+    end
+  end
+
   test 'a signed in user should not change their current user with invalid password' do
     sign_in_as_user
     get edit_user_registration_path

test/rails_app/config/initializers/devise.rb

@@ -180,6 +180,12 @@
   #   manager.default_strategies(scope: :user).unshift :some_external_strategy
   # end
 
+  # ==> Configuration for :registerable
+
+  # When set to false, does not sign a user in automatically after their password is
+  # changed. Defaults to true, so a user is signed in automatically after changing a password.
+  # config.sign_in_after_change_password = true
+
   ActiveSupport.on_load(:devise_failure_app) do
     require "lazy_load_test_module"
     include LazyLoadTestModule