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https://github.com/intridea/omniauth

OmniAuth is a flexible authentication system utilizing Rack middleware.
https://github.com/intridea/omniauth

authentication hacktoberfest omniauth ruby

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OmniAuth is a flexible authentication system utilizing Rack middleware.

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# OmniAuth: Standardized Multi-Provider Authentication



[![Gem Version](http://img.shields.io/gem/v/omniauth.svg)][gem]

[![Ruby](https://github.com/omniauth/omniauth/actions/workflows/main.yml/badge.svg)][githubactions]

[![TruffleRuby](https://github.com/omniauth/omniauth/actions/workflows/truffle_ruby.yml/badge.svg)][githubactionstruffle]

[![JRuby](https://github.com/omniauth/omniauth/actions/workflows/jruby.yml/badge.svg)][githubactionsjruby]

[![Code Climate](https://api.codeclimate.com/v1/badges/ffd33970723587806744/maintainability)][codeclimate]

[![Coverage Status](http://img.shields.io/coveralls/omniauth/omniauth.svg)][coveralls]



[gem]: https://rubygems.org/gems/omniauth

[githubactions]: https://github.com/omniauth/omniauth/actions/workflows/main.yml

[githubactionstruffle]: https://github.com/omniauth/omniauth/actions/workflows/truffle_ruby.yml

[githubactionsjruby]: https://github.com/omniauth/omniauth/actions/workflows/jruby.yml

[codeclimate]: https://codeclimate.com/github/omniauth/omniauth

[coveralls]: https://coveralls.io/r/omniauth/omniauth



This is the documentation for the in-development branch of OmniAuth.

You can find the documentation for the latest stable release [here](https://github.com/omniauth/omniauth/tree/v2.1.2)



## An Introduction

OmniAuth is a library that standardizes multi-provider authentication for

web applications. It was created to be powerful, flexible, and do as

little as possible. Any developer can create **strategies** for OmniAuth

that can authenticate users via disparate systems. OmniAuth strategies

have been created for everything from Facebook to LDAP.



In order to use OmniAuth in your applications, you will need to leverage

one or more strategies. These strategies are generally released

individually as RubyGems, and you can see a [community maintained list](https://github.com/omniauth/omniauth/wiki/List-of-Strategies)

on the wiki for this project.



One strategy, called `Developer`, is included with OmniAuth and provides

a completely insecure, non-production-usable strategy that directly

prompts a user for authentication information and then passes it

straight through. You can use it as a placeholder when you start

development and easily swap in other strategies later.



## Getting Started

Each OmniAuth strategy is a Rack Middleware. That means that you can use

it the same way that you use any other Rack middleware. For example, to

use the built-in Developer strategy in a Sinatra application you might

do this:



```ruby

require 'sinatra'

require 'omniauth'



class MyApplication < Sinatra::Base

  use Rack::Session::Cookie

  use OmniAuth::Strategies::Developer

end

```



Because OmniAuth is built for *multi-provider* authentication, you may

want to leave room to run multiple strategies. For this, the built-in

`OmniAuth::Builder` class gives you an easy way to specify multiple

strategies. Note that there is **no difference** between the following

code and using each strategy individually as middleware. This is an

example that you might put into a Rails initializer at

`config/initializers/omniauth.rb`:



```ruby

Rails.application.config.middleware.use OmniAuth::Builder do

  provider :developer unless Rails.env.production?

  provider :twitter, ENV['TWITTER_KEY'], ENV['TWITTER_SECRET']

end

```



You should look to the documentation for each provider you use for

specific initialization requirements.



## Integrating OmniAuth Into Your Application

OmniAuth is an extremely low-touch library. It is designed to be a

black box that you can send your application's users into when you need

authentication and then get information back. OmniAuth was intentionally

built not to automatically associate with a User model or make

assumptions about how many authentication methods you might want to use

or what you might want to do with the data once a user has

authenticated. This makes OmniAuth incredibly flexible. To use OmniAuth,

you need only to redirect users to `/auth/:provider`, where `:provider`

is the name of the strategy (for example, `developer` or `twitter`).

From there, OmniAuth will take over and take the user through the

necessary steps to authenticate them with the chosen strategy.



Once the user has authenticated, what do you do next? OmniAuth simply

sets a special hash called the Authentication Hash on the Rack

environment of a request to `/auth/:provider/callback`. This hash

contains as much information about the user as OmniAuth was able to

glean from the utilized strategy. You should set up an endpoint in your

application that matches to the callback URL and then performs whatever

steps are necessary for your application. 



The `omniauth.auth` key in the environment hash provides an

Authentication Hash which will contain information about the just

authenticated user including a unique id, the strategy they just used

for authentication, and personal details such as name and email address

as available. For an in-depth description of what the authentication

hash might contain, see the [Auth Hash Schema wiki page](https://github.com/omniauth/omniauth/wiki/Auth-Hash-Schema).



Note that OmniAuth does not perform any actions beyond setting some

environment information on the callback request. It is entirely up to

you how you want to implement the particulars of your application's

authentication flow.



## rack_csrf



`omniauth` is not OOTB-compatible with [rack_csrf](https://github.com/baldowl/rack_csrf). In order to do so, the following code needs to be added to the application bootstrapping code:



```ruby

OmniAuth::AuthenticityTokenProtection.default_options(key: "csrf.token", authenticity_param: "_csrf")

```



## Rails (without Devise)

To get started, add the following gems



**Gemfile**:

```ruby

gem 'omniauth'

gem "omniauth-rails_csrf_protection"

```



Then insert OmniAuth as a middleware



**config/initializers/omniauth.rb**:

```ruby

Rails.application.config.middleware.use OmniAuth::Builder do

  provider :developer if Rails.env.development?

end

```



Additional providers can be added here in the future. Next we wire it

all up using routes, a controller and a login view.



**config/routes.rb**:



```ruby

  get 'auth/:provider/callback', to: 'sessions#create'

  get '/login', to: 'sessions#new'

```



**app/controllers/sessions_controller.rb**:

```ruby

class SessionsController < ApplicationController

  def new

    render :new

  end



  def create

    user_info = request.env['omniauth.auth']

    raise user_info # Your own session management should be placed here.

  end

end

```



**app/views/sessions/new.html.erb**:

```erb

<%= form_tag('/auth/developer', method: 'post', data: {turbo: false}) do %>

  Login with Developer

<% end %>

```



Now if you visit `/login` and click the Login button, you should see the

OmniAuth developer login screen. After submitting it, you are returned to your

application at `Sessions#create`. The raise should now display all the Omniauth

details you have available to integrate it into your own user management.



If you want out of the box usermanagement, you should consider using Omniauth

through Devise. Please visit the [Devise Github page](https://github.com/heartcombo/devise#omniauth)

for more information.



## Rails API

The following middleware are (by default) included for session management in

Rails applications. When using OmniAuth with a Rails API, you'll need to add

one of these required middleware back in:



- `ActionDispatch::Session::CacheStore`

- `ActionDispatch::Session::CookieStore`

- `ActionDispatch::Session::MemCacheStore`



The trick to adding these back in is that, by default, they are passed

`session_options` when added (including the session key), so you can't just add

a `session_store.rb` initializer, add `use ActionDispatch::Session::CookieStore`

and have sessions functioning as normal.



To be clear: sessions may work, but your session options will be ignored

(i.e. the session key will default to `_session_id`).  Instead of the

initializer, you'll have to set the relevant options somewhere

before your middleware is built (like `application.rb`) and pass them to your

preferred middleware, like this:



**application.rb:**



```ruby

config.session_store :cookie_store, key: '_interslice_session'

config.middleware.use ActionDispatch::Cookies # Required for all session management

config.middleware.use ActionDispatch::Session::CookieStore, config.session_options

```



(Thanks @mltsy)



## Logging

OmniAuth supports a configurable logger. By default, OmniAuth will log

to `STDOUT` but you can configure this using `OmniAuth.config.logger`:



```ruby

# Rails application example

OmniAuth.config.logger = Rails.logger

```



## Origin Param

The `origin` url parameter is typically used to inform where a user came from

and where, should you choose to use it, they'd want to return to.

Omniauth supports the following settings which can be configured on a provider level:



**Default**:

```ruby

provider :twitter, ENV['KEY'], ENV['SECRET']

POST /auth/twitter/?origin=[URL]

# If the `origin` parameter is blank, `omniauth.origin` is set to HTTP_REFERER

```



**Using a differently named origin parameter**:

```ruby

provider :twitter, ENV['KEY'], ENV['SECRET'], origin_param: 'return_to'

POST /auth/twitter/?return_to=[URL]

# If the `return_to` parameter is blank, `omniauth.origin` is set to HTTP_REFERER

```



**Disabled**:

```ruby

provider :twitter, ENV['KEY'], ENV['SECRET'], origin_param: false

POST /auth/twitter

# This means the origin should be handled by your own application. 

# Note that `omniauth.origin` will always be blank.

```



## Resources

The [OmniAuth Wiki](https://github.com/omniauth/omniauth/wiki) has

actively maintained in-depth documentation for OmniAuth. It should be

your first stop if you are wondering about a more in-depth look at

OmniAuth, how it works, and how to use it.



## OmniAuth for Enterprise



Available as part of the Tidelift Subscription.



The maintainers of OmniAuth and thousands of other packages are working with

Tidelift to deliver commercial support and maintenance for the open source

packages you use to build your applications. Save time, reduce risk, and

improve code health, while paying the maintainers of the exact packages you use.

[Learn more.](https://tidelift.com/subscription/pkg/rubygems-omniauth?utm_source=undefined&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)



## Supported Ruby Versions

OmniAuth is tested under 2.5, 2.6, 2.7, 3.0, 3.1, 3.2, truffleruby, and JRuby.



## Versioning

This library aims to adhere to [Semantic Versioning 2.0.0][semver]. Violations

of this scheme should be reported as bugs. Specifically, if a minor or patch

version is released that breaks backward compatibility, that version should be

immediately yanked and/or a new version should be immediately released that

restores compatibility. Breaking changes to the public API will only be

introduced with new major versions. As a result of this policy, you can (and

should) specify a dependency on this gem using the [Pessimistic Version

Constraint][pvc] with two digits of precision. For example:



    spec.add_dependency 'omniauth', '~> 1.0'



[semver]: http://semver.org/

[pvc]: http://guides.rubygems.org/patterns/#pessimistic-version-constraint



## License

Copyright (c) 2010-2017 Michael Bleigh and Intridea, Inc. See [LICENSE][] for

details.



[license]: LICENSE.md