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Plack Middleware for OAuth1 and OAuth2
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README.mkdn

NAME

Plack::Middleware::OAuth - Plack middleware for OAuth1, OAuth2 and builtin provider configs.

DESCRIPTION

This module is still in BETA , DO NOT USE THIS FOR PRODUCTION!

Plack::Middleware::OAuth supports OAuth1 and OAuth2, and provides builtin config for providers like Twitter, GitHub, Google, Facebook. The only one thing you need to mount your OAuth service is to setup your consumer_key, consumer_secret (for OAuth1) or client_id, client_secret, scope (for OAuth2).

This middleware also generates authorize url (mount_path/provider_id) and auththorize callback url (mount_path/provider_id/callback). If the authorize path matches, then user will be redirected to OAuth provider to authorize your application.

For example, if you mount Plack::Middleware::OAuth on /oauth, then you can access http://youdomain.com/oauth/twitter to authorize, Plack::Middleware::OAuth will redirect you to Twitter, after authorized, then Twitter will redirect you to your callback url http://youdomain.com/oauth/twitter/callback.

For more details, please check the example psgi in eg/ directory.

SYNOPSIS

use Plack::Builder;

builder {

    mount '/oauth' => builder {
        enable 'OAuth', 

            on_success => sub  { 
                my ($self,$token) = @_;
                my $env = $self->env;

                my $config = $self->config;   # provider config



                return $self->render( '..html content..' );
                return $self->redirect( .... URL ... );

                return [  200 , [ 'Content-type' => 'text/html' ] , 'Signin!' ];



            },

            on_error => sub {  ...  },

            providers => 'providers.yml',   # also works

            providers => {

                # capital case implies Plack::Middleware::OAuth::Twitter
                'Twitter' =>
                {
                    consumer_key      => ...
                    consumer_secret   => ...
                },

                # captical case implies Plack::Middleware::OAuth::Facebook
                'Facebook' =>
                {
                    client_id        => ...
                    client_secret           => ...
                    scope            => 'email,read_stream',
                },

                'GitHub' => 
                {
                    client_id => ...
                    client_secret => ...
                    scope => 'user,public_repo'
                },

                'Google' =>  { 
                    client_id     => '',
                    client_secret => '',
                    scope         => 'https://www.google.com/m8/feeds/'
                },


                'Live' =>  { 
                    client_id     => '',
                    client_secret => '',
                    scope         => 'wl.basic'
                },

                'custom_provider' => { 
                    version => 1,
                    ....
                }
        };
    };
    $app;
};

The callback/redirect URL is set to {SCHEMA}://{HTTP_HOST}/{prefix}/{provider}/callback by default.

OAuth URL and Callback URL

For a defined key in providers hashref, and you mounted OAuth middleware at /oauth, the generated URLs will be like:

authorize path: /oauth/custom_provider
authorize callback path: /oauth/custom_provider/callback

The provider id (key) will be converted into lower-case.

For example, GitHub's URLs will be like:

/oauth/github
/oauth/github/callback

Facebook,

/oauth/facebook
/oauth/facebook/callback

You can also specify custom callback URL in a provider config.

Specify Success Callback

When access token is got, success handler will be called:

enable 'OAuth', 
    providers => { .... },
    on_success => sub  { 
        my ($self,$token) = @_;

        # $self: Plack::Middleware::OAuth::Handler (isa Plack::Request) object

        return $self->render( .... );

        return $self->redirect( .... );

        return $self->to_yaml( .... );

        return $self->to_json( .... );

        # or just return a raw arrayref
        return [  200 , [ 'Content-type' => 'text/html' ] , 'Signin!' ];
    };

Without specifying on_success, OAuth middleware will use YAML to dump the response data to page.

To use access token to get user information, the following example demonstracte how to get corresponding user information:

on_success => sub {
    my ($self,$token) = @_;

    if( $token->is_provider('Twitter') ) {
        my $config = $self->config;

        # return $self->to_yaml( $config );

        # get twitter user infomation with (api)
        my $twitter = Net::Twitter->new(
            traits              => [qw/OAuth API::REST/],
            consumer_key        => $config->{consumer_key},
            consumer_secret     => $config->{consumer_secret},
            access_token        => $token->access_token,
            access_token_secret => $token->access_token_secret,
        );

        return $self->to_yaml( { 
            account_settings => $twitter->account_settings,
            account_totals => $twitter->account_totals,
            show_user => $twitter->show_user( $token->params->{extra_params}->{screen_name} )
        } );
    }
}

User Info Query Interface

To query user info from OAuth provider, you can use Plack::Middleware::OAuth::UserInfo to help you.

my $userinfo = Plack::Middleware::OAuth::UserInfo->new( 
    token =>  $token , 
    config => $provider_config
);
my $info_hash = $userinfo->ask( 'Twitter' );   # load Plack::Middleware::OAuth::UserInfo::Twitter

In you oauth success handler, it would be like:

on_success => sub {
    my ($self,$token) = @_;

    my $userinfo = Plack::Middleware::OAuth::UserInfo->new( 
        token =>  $token , 
        config => $self->config
    );
    my $info_hash = $userinfo->ask( 'Twitter' );   # load Plack::Middleware::OAuth::UserInfo::Twitter
    return $self->to_yaml( $info_hash );
};

Error Handler

An error handler should return a response data, it should be an array reference, for be finalized from Plack::Response:

enable 'OAuth', 
    providers => { .... },
    on_error => sub {
        my ($self,$token) = @_;

        $self->render( 'Error' ) unless $token;

        # $self: Plack::Middleware::OAuth::Handler (isa Plack::Request) object

    };

OAuth1 AccessToken Callback Data Structure

Twitter uses OAuth 1.0a, and the access token callback returns data like this:

---
params:
    access_token: {{string}}
    access_token_secret: {{string}}
    extra_params:
        screen_name: {{screen name}}
        user_id: {{user id}}
provider: Twitter
version: 1

OAuth2 AccessToken Callback Data Structure

GitHub uses OAuth 2.0, and the access token callback returns data like this:

---
params:
    code: {{string}}
    access_token: {{string}}
    token_type: bearer
provider: GitHub
version: 2

Google returns:

---
params:
    access_token: {{string}}
    code: {{string}}
    expires_in: 3600
    refresh_token: {{string}}
    token_type: Bearer
provider: Google
version: 2

Sessions

You can get OAuth1 or OAuth2 access token from Plack::Session,

my $session = Plack::Session->new( $env );
$session->get( 'oauth.twitter.access_token' );
$session->get( 'oauth.twitter.access_token_secret' );  # OAuth version

$session->get( 'oauth.facebook.access_token' );
$session->get( 'oauth.facebook.version' );   # OAuth version

Custom provider:

$session->get( 'oauth.custom_provider.access_token' );
$session->get( 'oauth.custom_provider.version' );

Supported Providers

  • Google
  • Twitter
  • Facebook
  • GitHub
  • Live

See Also

Net::OAuth, Net::OAuth2

Reference

Contributors

RsrchBoy

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