🗑️ nondisposable - Block disposable email addresses from signing up to your Rails app

nondisposable is a Ruby gem that prevents users from signing up to your Rails app with disposable email addresses.

Simply add to your User model:

ruby validates :email, nondisposable: true

That’s it! You’re done.

The gem also provides a job you can run daily to keep your disposable domain list up to date.

Installation

Add this line to your application’s Gemfile:

ruby gem 'nondisposable'

And then execute:

bash bundle install

After installing the gem, run the installation generator:

bash rails generate nondisposable:install

This will create the necessary migration file, initializer, and a job for scheduled updates. Run the migration:

bash rails db:migrate

Finally, populate the initial list of disposable domains:

ruby Nondisposable::DomainListUpdater.update

Usage

To use nondisposable in your models, simply add the validation:

ruby class User < ApplicationRecord validates :email, nondisposable: true end

You can customize the error message: ruby class User < ApplicationRecord validates :email, nondisposable: { message: "is a disposable email address, please use a permanent email address." } end

The validation works seamlessly with other Rails validations: ruby class User < ApplicationRecord validates :email, presence: true, format: { with: URI::MailTo::EMAIL_REGEXP }, nondisposable: true end

If you’re validating a different attribute name: ruby class User < ApplicationRecord validates :backup_email, nondisposable: true end

Configuration

You can customize the gem’s behavior by creating an initializer:

```ruby # config/initializers/nondisposable.rb

Nondisposable.configure do |config| config.error_message = “provider is not allowed. Please use a non-disposable email address.” config.additional_domains = [‘custom-disposable-domain.com’] config.excluded_domains = [‘false-positive-domain.com’] end ```

Direct Check

You can also check if an email is disposable directly:

ruby Nondisposable.disposable?('user@example.com') # => false Nondisposable.disposable?('user@disposable-email.com') # => true

Updating disposable domains

To manually update the list of disposable domains, run:

ruby Nondisposable::DomainListUpdater.update

It’s important you keep your disposable domain list up to date. nondisposable will read from the latest version of the disposable-email-domains list, which is typically updated every few days.

For this, nondisposable provides you with an Active Job (DisposableEmailDomainListUpdateJob) that you can use to schedule daily updates. How you do that, exactly, depends on the queueing system you’re using.

If you’re using solid_queue (the Rails 8 default), you can easily add it to your schedule in the config/recurring.yml file like this: yaml production: refresh_disposable_domains: class: DisposableEmailDomainListUpdateJob queue: default schedule: every day at 3am US/Pacific

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/rameerez/nondisposable. Our code of conduct is: just be nice and make your mom proud of what you do and post online.

License

The gem is available as open source under the terms of the MIT License.