NAME

Net::Facebook::Oauth2 - a simple Perl wrapper around Facebook OAuth 2.0 protocol

SYNOPSIS

Somewhere in your application's login process:

use Net::Facebook::Oauth2;

my $fb = Net::Facebook::Oauth2->new(
    application_id     => 'your_application_id', 
    application_secret => 'your_application_secret',
    callback           => 'http://yourdomain.com/facebook/callback'
);

# get the authorization URL for your application
my $url = $fb->get_authorization_url(
    scope   => [ 'name', 'email', 'profile_picture' ],
    display => 'page'
);

Now redirect the user to this $url.

Once the user authorizes your application, Facebook will send him/her back to your application, on the callback link provided above. PLEASE NOTE THAT YOU MUST PRE-AUTHORIZE YOUR CALLBACK URI ON FACEBOOK'S APP DASHBOARD.

Inside that callback route, use the verifier code parameter that Facebook sends to get the access token:

# param() below is a bogus function. Use whatever your web framework
# provides (e.g. $c->req->param('code'), $cgi->param('code'), etc)
my $code = param('code');

use Try::Tiny;  # or eval {}, or whatever

my ($unique_id, $access_token);
try {
    $access_token = $fb->get_access_token(code => $code); # <-- could die!

    # Facebook tokens last ~2h, but you may upgrade them to ~60d if you want:
    $access_token = $fb->get_long_lived_token( access_token => $access_token );

    my $access_data = $fb->debug_token( input => $access_token );
    if ($access_data && $access_data->{is_valid}) {
        $unique_id = $access_data->{user_id};
        # you could also check here for what scopes were granted to you
        # by inspecting $access_data->{scopes}->@*
    }
} catch {
    # handle errors here!
};

If you got so far, your user is logged! Save this access token in your database or session. As shown in the example above, Facebook also provides a unique user_id for this token so you can associate it with a particular user of your app.

Later on you can use it to communicate with Facebook on behalf of this user:

my $fb = Net::Facebook::Oauth2->new(
    access_token => $access_token
);

my $info = $fb->get(
    'https://graph.facebook.com/v4.0/me'   # Facebook API URL
);

print $info->as_json;

DESCRIPTION

Net::Facebook::Oauth2 gives you a way to simply access FaceBook Oauth 2.0 protocol

For more information please see example folder shipped with this Module, or refer to the full documentation.

INSTALLATION

cpanm Net::Facebook::Oauth2

Or the old-fashioned manual way:

perl Makefile.PL
make
make test
make install

AUTHOR

Mahmoud A. Mehyar, <[email protected]>

CONTRIBUTORS

Big Thanks To

• Takatsugu Shigeta @comewalk

• Breno G. de Oliveira @garu

• squinker @squinker

• Valcho Nedelchev @valchonedelchev

COPYRIGHT AND LICENSE

Copyright (C) 2012-2019 by Mahmoud A. Mehyar

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.