Spotify OmniAuth Strategy

This gem provides a simple way to authenticate to the Spotify Web API using OmniAuth with OAuth2.

Installation

Add this line to your application's Gemfile:

gem 'omniauth-spotify'

And then execute:

$ bundle

Or install it yourself as:

$ gem install omniauth-spotify

Usage

You'll need to register an app on Spotify, you can do this here - https://developer.spotify.com/my-applications/#!/applications

Usage of the gem is very similar to other OmniAuth strategies. You'll need to add your app credentials to config/initializers/omniauth.rb:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :spotify, Rails.application.credentials.spotify[:client_id], Rails.application.credentials.spotify[:client_secret], scope: %w(
    playlist-read-private
    user-read-private
    user-read-email
  ).join(' ')
end

Please replace the example scope provided with your own. Read more about scopes here: https://developer.spotify.com/web-api/using-scopes/

Or with Devise in config/initializers/devise.rb:

config.omniauth :spotify, Rails.application.credentials.spotify[:client_id], Rails.application.credentials.spotify[:client_secret], scope: %w(
  playlist-read-private
  user-read-private
  user-read-email
).join(' ')

Forcing a Permission-Request Dialog

If a user has given permission for an app to access a scope, that permission won't be asked again unless the user revokes access. In these cases, authorization sequences proceed without user interation.

To force a permission dialog being shown to the user, which also makes it possible for them to switch Spotify accounts, set either request.env['rack.session'][:ommiauth_spotify_force_approval?] or flash[:ommiauth_spotify_force_approval?] (Rails apps only) to a truthy value on the request that performs the Omniauth redirection.

Alternately, you can pass show_dialog=true when you redirect to your spotify auth URL if you prefer not to use the session.

http://localhost:3000/auth/spotify?show_dialog=true

Auth Hash Schema

Authorization data is available in the request.env['omniauth.auth'].credentials -- a hash that also responds to the token, refresh_token, expires_at, and expires methods.

 {
    "token" => "xxxx",
    "refresh_token" => "xxxx",
    "expires_at" => 1403021232,
    "expires" => true
 }

Information about the authorized Spotify user is available in the request.env['omniauth.auth'].info hash. e.g.

 {
    :name => "Claudio Poli",
    :nickname => "SomeName",
    :email => "claudio@icorete.ch",
    :urls => {"spotify" => "https://open.spotify.com/user/1111111111"},
    :image => "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xfp1/t1.0-1/s320x320/301234_1962753760624_625151598_n.jpg",
    :birthdate => Mon, 01 Mar 1993, # Date class
    :country_code => "IT",
    :product => "open",
    :follower_count => 10
  }

The username/nickname is also available via a call to request.env['omniauth.auth'].uid.

Unless the user-read-private scope is included, the birthdate, country, image, and product fields may be nil, and the name field will be set to the username/nickname instead of the display name.
The email field will be nil if the 'user-read-email' scope isn't included.
The raw response to the me endpoint call is also available in request.env['omniauth.auth'].extra['raw_info']. e.g.

{
  "country" => "IT",
  "display_name" => "Claudio Poli",
  "birthdate" => "1993-03-01",
  "email" => "claudio@icorete.ch",
  "external_urls" => {
    "spotify" => "https://open.spotify.com/user/1111111111"
  },
  "followers" => {
    "href" => nil,
    "total" => 10
  },
  "href" => "https://api.spotify.com/v1/users/1111111111",
  "id" => "1111111111",
  "images" => [
    {
      "height" => nil,
      "url" => "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xfp1/t1.0-1/s320x320/301234_1962753760624_625151598_n.jpg",
      "width" => nil
    }
  ],
  "product" => "open",
  "type" => "user",
  "uri" => "spotify:user:1111111111"
}

This gem is brought to you by the AudioBox guys. Enjoy!

Contributing

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request