NAME

Mojolicious::Plugin::OAuth2 - Auth against OAuth2 APIs including OpenID Connect

SYNOPSIS

Example application

use Mojolicious::Lite;

plugin OAuth2 => {
  providers => {
    facebook => {
      key    => 'some-public-app-id',
      secret => $ENV{OAUTH2_FACEBOOK_SECRET},
    },
  },
};

get '/connect' => sub {
  my $c         = shift;
  my %get_token = (redirect_uri => $c->url_for('connect')->userinfo(undef)->to_abs);

  return $c->oauth2->get_token_p(facebook => \%get_token)->then(sub {
    # Redirected to Facebook
    return unless my $provider_res = shift;

    # Token received
    $c->session(token => $provider_res->{access_token});
    $c->redirect_to('profile');
  })->catch(sub {
    $c->render('connect', error => shift);
  });
};

See "register" for more details about the configuration this plugin takes.

Testing

Code using this plugin can perform offline testing, using the "mocked" provider:

$app->plugin(OAuth2 => {mocked => {key => 42}});
$app->routes->get('/profile' => sub {
  my $c = shift;

  state $mocked = $ENV{TEST_MOCKED} && 'mocked';
  return $c->oauth2->get_token_p($mocked || 'facebook')->then(sub {
    ...
  });
});

See Mojolicious::Plugin::OAuth2::Mock for more details.

Connect button

You can add a "connect link" to your template using the "oauth2.auth_url" helper. Example template:

Click here to log in:
<%= link_to 'Connect!', $c->oauth2->auth_url('facebook', scope => 'user_about_me email') %>

DESCRIPTION

This Mojolicious plugin allows you to easily authenticate against a OAuth2 or OpenID Connect provider. It includes configurations for a few popular providers, but you can add your own as well.

See "register" for a full list of bundled providers.

To support "OpenID Connect", the following optional modules must be installed manually: Crypt::OpenSSL::Bignum, Crypt::OpenSSL::RSA and Mojo::JWT. The modules can be installed with App::cpanminus:

$ cpanm Crypt::OpenSSL::Bignum Crypt::OpenSSL::RSA Mojo::JWT

HELPERS

oauth2.auth_url

$url = $c->oauth2->auth_url($provider_name => \%args);

Returns a Mojo::URL object which contain the authorize URL. This is useful if you want to add the authorize URL as a link to your webpage instead of doing a redirect like "oauth2.get_token" does. %args is optional, but can contain:

• host

  Useful if your provider uses different hosts for accessing different accounts. The default is specified in the provider configuration.

    $url->host($host);
  

• authorize_query

  Either a hash-ref or an array-ref which can be used to give extra query params to the URL.

    $url->query($authorize_url);
  

• redirect_uri

  Useful if you want to go back to a different page than what you came from. The default is:

    $c->url_for->to_abs->to_string
  

• scope

  Scope to ask for credentials to. Should be a space separated list.

• state

  A string that will be sent to the identity provider. When the user returns from the identity provider, this exact same string will be carried with the user, as a GET parameter called state in the URL that the user will return to.

oauth2.get_refresh_token_p

$promise = $c->oauth2->get_refresh_token_p($provider_name => \%args);

When Mojolicious::Plugin::OAuth2 is being used in OpenID Connect mode this helper allows for a token to be refreshed by specifying a refresh_token in %args. Usage is similar to "oauth2.get_token_p".

oauth2.get_token_p

$promise = $c->oauth2->get_token_p($provider_name => \%args)
             ->then(sub { my $provider_res = shift })
             ->catch(sub { my $err = shift; });

"oauth2.get_token_p" is used to either fetch an access token from an OAuth2 provider, handle errors or redirect to OAuth2 provider. $err in the rejection handler holds a error description if something went wrong. $provider_res is a hash-ref containing the access token from the OAauth2 provider or undef if this plugin performed a 302 redirect to the provider's connect website.

In more detail, this method will do one of two things:

1. When called from an action on your site, it will redirect you to the provider's authorize_url. This site will probably have some sort of "Connect" and "Reject" button, allowing the visitor to either connect your site with his/her profile on the OAuth2 provider's page or not.
2. The OAuth2 provider will redirect the user back to your site after clicking the "Connect" or "Reject" button. $provider_res will then contain a key "access_token" on "Connect" and a false value on "Reject".

The method takes these arguments: $provider_name need to match on of the provider names under "Configuration" or a custom provider defined when registering the plugin.

%args can have:

• host

  Useful if your provider uses different hosts for accessing different accounts. The default is specified in the provider configuration.

• redirect

  Set redirect to 0 to disable automatic redirect.

• scope

  Scope to ask for credentials to. Should be a space separated list.

oauth2.jwt_decode

$claims = $c->oauth2->jwt_decode($provider, sub { my $jwt = shift; ... });
$claims = $c->oauth2->jwt_decode($provider);

When Mojolicious::Plugin::OAuth2 is being used in OpenID Connect mode this helper allows you to decode the response data encoded with the JWKS discovered from well_known_url configuration.

oauth2.logout_url

$url = $c->oauth2->logout_url($provider_name => \%args);

When Mojolicious::Plugin::OAuth2 is being used in OpenID Connect mode this helper creates the url to redirect to end the session. The OpenID Connect Provider will redirect to the post_logout_redirect_uri provided in %args. Additional keys for %args are id_token_hint and state.

oauth2.providers

$hash_ref = $c->oauth2->providers;

This helper allow you to access the raw providers mapping, which looks something like this:

{
  facebook => {
    authorize_url => "https://graph.facebook.com/oauth/authorize",
    token_url     => "https://graph.facebook.com/oauth/access_token",
    key           => ...,
    secret        => ...,
  },
  ...
}

ATTRIBUTES

providers

$hash_ref = $oauth2->providers;

Holds a hash of provider information. See "oauth2.providers".

METHODS

register

$app->plugin(OAuth2 => \%provider_config);
$app->plugin(OAuth2 => {providers => \%provider_config, proxy => 1, ua => Mojo::UserAgent->new});

Will register this plugin in your application with a given %provider_config. The keys in %provider_config are provider names and the values are configuration for each provider. Note that the value will be merged with the predefined providers below.

Instead of just passing in %provider_config, it is possible to pass in a more complex config, with these keys:

• providers

  The %provider_config must be present under this key.

• proxy

  Setting this to a true value will automatically detect proxy settings using "detect" in Mojo::UserAgent::Proxy.

• ua

  A custom Mojo::UserAgent, in case you want to change proxy settings, timeouts or other attributes.

Instead of just passing in %provider_config, it is possible to pass in a hash-ref "providers" (%provider_config) and "ua" (a custom Mojo::UserAgent object).

Here is an example to add adddition information like "key" and "secret":

$app->plugin(OAuth2 => {
  providers => {
    custom_provider => {
      key           => 'APP_ID',
      secret        => 'SECRET_KEY',
      authorize_url => 'https://provider.example.com/auth',
      token_url     => 'https://provider.example.com/token',
    },
    github => {
      key    => 'APP_ID',
      secret => 'SECRET_KEY',
    },
  },
});

For OpenID Connect, authorize_url and token_url are configured from the well_known_url so these are replaced by the well_known_url key.

$app->plugin(OAuth2 => {
  providers => {
    azure_ad => {
      key            => 'APP_ID',
      secret         => 'SECRET_KEY',
      well_known_url => 'https://login.microsoftonline.com/tenant-id/v2.0/.well-known/openid-configuration',
    },
  },
});

To make it a bit easier the are already some predefined providers bundled with this plugin:

dailymotion

Authentication for https://www.dailymotion.com/ video site.

debian_salsa

Authentication for https://salsa.debian.org/.

eventbrite

Authentication for https://www.eventbrite.com event site.

See also http://developer.eventbrite.com/docs/auth/.

facebook

OAuth2 for Facebook's graph API, http://graph.facebook.com/. You can find key (App ID) and secret (App Secret) from the app dashboard here: https://developers.facebook.com/apps.

See also https://developers.facebook.com/docs/reference/dialogs/oauth/.

instagram

OAuth2 for Instagram API. You can find key (Client ID) and secret (Client Secret) from the app dashboard here: https://www.instagram.com/developer/clients/manage/.

See also https://www.instagram.com/developer/authentication/.

github

Authentication with Github.

See also https://developer.github.com/v3/oauth/.

google

OAuth2 for Google. You can find the key (CLIENT ID) and secret (CLIENT SECRET) from the app console here under "APIs & Auth" and "Credentials" in the menu at https://console.developers.google.com/project.

See also https://developers.google.com/+/quickstart/.

vkontakte

OAuth2 for Vkontakte. You can find key (App ID) and secret (Secure key) from the app dashboard here: https://vk.com/apps?act=manage.

See also https://vk.com/dev/authcode_flow_user.

AUTHOR

Marcus Ramberg - mramberg@cpan.org

Jan Henning Thorsen - jhthorsen@cpan.org

LICENSE

This software is licensed under the same terms as Perl itself.

SEE ALSO

• http://oauth.net/documentation/
• http://aaronparecki.com/articles/2012/07/29/1/oauth2-simplified
• http://homakov.blogspot.jp/2013/03/oauth1-oauth2-oauth.html
• http://en.wikipedia.org/wiki/OAuth#OAuth_2.0
• https://openid.net/connect/