Only allow password reset emails once per minute

app/controllers/passwords_controller.rb

@@ -2,18 +2,19 @@ class PasswordsController < Devise::PasswordsController
 
   def create
     email = resource_params[:email]
-    resource_found = resource_class.find_by_email(email)
-    if resource_found && resource_found.ldap_user?
+    self.resource = resource_class.find_by_email(email)
+
+    if resource && resource.ldap_user?
       flash[:alert] = "Cannot reset password for LDAP user."
       respond_with({}, location: after_sending_reset_password_instructions_path_for(resource_name)) and return
     end
 
-    self.resource = resource_class.send_reset_password_instructions(resource_params)
-    if successfully_sent?(resource)
-      respond_with({}, location: after_sending_reset_password_instructions_path_for(resource_name))
-    else
-      respond_with(resource)
+    unless can_send_reset_email?
+      flash[:alert] = "Instructions about how to reset your password have already been sent recently. Please wait a few minutes to try again."
+      respond_with({}, location: new_password_path(resource_name)) and return
     end
+
+    super
   end
 
   def edit
@@ -35,4 +36,11 @@ class PasswordsController < Devise::PasswordsController
       end
     end
   end
+
+  private
+
+  def can_send_reset_email?
+    resource && (resource.reset_password_sent_at.blank? ||
+                 resource.reset_password_sent_at < 1.minute.ago)
+  end
 end

spec/features/password_reset_spec.rb

 require 'spec_helper'
 
 feature 'Password reset', feature: true do
-  describe 'with two-factor authentication' do
-    let(:user) { create(:user, :two_factor) }
+  describe 'throttling' do
+    it 'sends reset instructions when not previously sent' do
+      visit root_path
+      forgot_password(create(:user))
+
+      expect(page).to have_content(I18n.t('devise.passwords.send_instructions'))
+      expect(current_path).to eq new_user_session_path
+    end
 
+    it 'sends reset instructions when previously sent more than a minute ago' do
+      user = create(:user)
+      user.send_reset_password_instructions
+      user.update_attribute(:reset_password_sent_at, 5.minutes.ago)
+
+      visit root_path
+      forgot_password(user)
+
+      expect(page).to have_content(I18n.t('devise.passwords.send_instructions'))
+      expect(current_path).to eq new_user_session_path
+    end
+
+    it "throttles multiple resets in a short timespan" do
+      user = create(:user)
+      user.send_reset_password_instructions
+
+      visit root_path
+      forgot_password(user)
+
+      expect(page).to have_content("Instructions about how to reset your password have already been sent recently. Please wait a few minutes to try again.")
+      expect(current_path).to eq new_user_password_path
+    end
+  end
+
+  describe 'with two-factor authentication' do
     it 'requires login after password reset' do
       visit root_path
 
-      forgot_password
+      forgot_password(create(:user, :two_factor))
       reset_password
 
       expect(page).to have_content("Your password was changed successfully.")
@@ -17,12 +48,10 @@ feature 'Password reset', feature: true do
   end
 
   describe 'without two-factor authentication' do
-    let(:user) { create(:user) }
-
     it 'requires login after password reset' do
       visit root_path
 
-      forgot_password
+      forgot_password(create(:user))
       reset_password
 
       expect(page).to have_content("Your password was changed successfully.")
@@ -30,7 +59,7 @@ feature 'Password reset', feature: true do
     end
   end
 
-  def forgot_password
+  def forgot_password(user)
     click_on 'Forgot your password?'
     fill_in 'Email', with: user.email
     click_button 'Reset password'