Introduction

This gem provides URI field validator for Rails' Active Model.

UriFormatValidator requires Active Model 4+. It is tested against MRI 2.2.2+, JRuby, and Rubinius in their recent versions.

Getting started

Add this line to your application’s Gemfile:

gem 'uri_format_validator'

Then install by executing bundle install. You may now define validations in your models, like that:

class User < ActiveRecord::Base
  validates :home_site_url, uri: true
end

For your convenience, an old-fashioned validation helper is also provided:

class User < ActiveRecord::Base
  validates_uri_format_of :home_site_url
end

Validation options

URI component constraints

You can specify constraints on URI components: scheme, authority, path, query, and fragment.

validates :home_site_url, uri: { scheme: /https?/ }
validates :home_site_url, uri: { scheme: %w[ssh telnet] }

validates :home_site_url, uri: { authority: /\.example\./ }
validates :home_site_url, uri: { authority: %w[example.com example.test] }

# require path component (`/` is not enough)
validates :home_site_url, uri: { path: true }
# disallow presence of path component
validates :home_site_url, uri: { path: false }
# match path against regular expression
validates :home_site_url, uri: { path: /regexp/ }

# require query component
validates :home_site_url, uri: { query: true }
# disallow presence of query component
validates :home_site_url, uri: { query: false }

# require fragment component
validates :home_site_url, uri: { fragment: true }
# disallow presence of fragment component
validates :home_site_url, uri: { fragment: false }

When scheme option is unspecified, only http and https are allowed.

Relative URIs

By default, only absolute URIs are valid. Specify authority: false option to allow relative and disallow absolute URLs:

validates :home_site_url, uri: { authority: false }

Reachable URLs

With retrievable options, you can ensure that URL indeed points to some resource. A HTTP HEAD request will be performed to that URL, and it must result with 2xx status code. Otherwise, given value is considered invalid.

validates :home_site_url, uri: { retrievable: true }

Error messages

You can also override the default error message:

validates :my_url_attribute, uri: true, message: 'is not a valid URL'

Alternatively, you can provide your own localization string for errors.messages.invalid_uri key.

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. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/riboseinc/uri_format_validator. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

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