File Coverage

blib/lib/Amon2/Auth/Site/LINE.pm

Criterion	Covered	Total	%
statement	21	94	22.3
branch	0	16	0.0
condition	0	18	0.0
subroutine	7	16	43.7
pod	0	9	0.0
total	28	153	18.3

package Amon2::Auth::Site::LINE;

use strict;
use warnings;
use utf8;
use URI;
use JSON;
use Mouse;
use LWP::UserAgent;

our $VERSION = '0.02';

sub moniker { 'line' }

has client_id => (
    is       => 'ro',
    isa      => 'Str',
    required => 1,
);

has client_secret => (
    is       => 'ro',
    isa      => 'Str',
    required => 1,
);

has redirect_uri => (
    is  => 'ro',
    isa => 'Str',
);

has state => (
    is  => 'ro',
    isa => 'Str',
);

has scope => (
    is      => 'ro',
    isa     => 'ArrayRef',
    default => sub { [qw(profile)] },
);

has nonce => (
    is  => 'ro',
    isa => 'Str',
);

has prompt => (
    is  => 'ro',
    isa => 'Str',
);

has max_age => (
    is  => 'ro',
    isa => 'Int',
);

has ui_locales => (
    is  => 'ro',
    isa => 'Str',
);

has bot_prompt => (
    is  => 'ro',
    isa => 'Str',
);

has user_info => (
    is      => 'rw',
    isa     => 'Bool',
    default => 1,
);

has state_session_key => (
    is      => 'ro',
    isa     => 'Str',
    default => 'line_login_state',
);

has nonce_session_key => (
    is      => 'ro',
    isa     => 'Str',
    default => 'line_login_nonce',
);

has authorize_url => (
    is      => 'ro',
    isa     => 'Str',
    default => 'https://access.line.me/oauth2/v2.1/authorize',
);

has access_token_url => (
    is      => 'ro',
    isa     => 'Str',
    default => 'https://api.line.me/oauth2/v2.1/token',
);

has verify_url => (
    is      => 'ro',
    isa     => 'Str',
    default => 'https://api.line.me/oauth2/v2.1/verify',
);

has profile_url => (
    is      => 'ro',
    isa     => 'Str',
    default => 'https://api.line.me/v2/profile',
);

has ua => (
    is      => 'ro',
    isa     => 'LWP::UserAgent',
    lazy    => 1,
    default => sub {
        LWP::UserAgent->new(agent => "Amon2::Auth::Site::LINE/$VERSION");
    },
);

sub auth_uri {
    my($self, $c, $callback_uri) = @_;

    # required parameters
    my $redirect_uri = $self->redirect_uri // $callback_uri;
    my %params = (
        response_type => 'code',
        client_id     => $self->client_id,
        scope         => join(' ', @{$self->scope}),
        redirect_uri  => $redirect_uri,
        state         => $self->get_state($c),
    );

    # optional parameters
    $params{nonce} = $self->get_nonce($c);

    for my $key (qw(prompt max_age ui_locales bot_prompt)) {
        my $value = $self->$key;
        if (defined $value) {
            $params{$key} = $value;
        }
    }

    my $auth_uri = URI->new($self->authorize_url);
    $auth_uri->query_form(%params);

    return $auth_uri->as_string;
}

sub callback {
    my($self, $c, $callback) = @_;

    # state mismatch
    if ($c->req->param('state') ne $self->get_state($c)) {
        return $callback->{on_error}->('state parameter mismatch');
    }

    # access denied
    if ($c->req->param('error')) {
        return $callback->{on_error}->($c->req->param('error_description'));
    }

    my @args = ();

    # getting an access token
    my $token_data;
    {
        my $redirect_uri = $self->redirect_uri // do { # it should be me
            my $current_uri = $c->req->uri;
            $current_uri->query(undef);
            $current_uri->as_string;
        };
        my $res = $self->ua->post($self->access_token_url => +{
            grant_type    => 'authorization_code',
            code          => $c->req->param('code'),
            redirect_uri  => $redirect_uri,
            client_id     => $self->client_id,
            client_secret => $self->client_secret,
        });
        unless ($res->is_success) {
            warn $res->decoded_content;
            return $callback->{on_error}->($res->status_line);
        }

        $token_data = decode_json($res->content);
    }

    # verify access token
    my $verify_data;
    {
        my $uri = URI->new($self->verify_url);
        $uri->query_form(access_token => $token_data->{access_token});

        my $res = $self->ua->get($uri->as_string);
        unless ($res->is_success) {
            warn $res->decoded_content;
            return $callback->{on_error}->($res->status_line);
        }

        $verify_data = decode_json($res->content);
        if ($verify_data->{client_id} ne $self->client_id) {
            return $callback->{on_error}->('client_id mismatch');
        }

        push @args, $token_data->{access_token};
    }


    # get user profile
    if ($self->user_info) {
        my $uri = URI->new($self->profile_url);
        my $res = $self->ua->get(
            $uri->as_string,
            Authorization => 'Bearer ' . $token_data->{access_token},
        );
        $res->is_success or do {
            warn $res->decoded_content;
            return $callback->{on_error}->($res->decoded_content);
        };
        my $user = decode_json($res->content);
        push @args, $user;
    }

    $self->clear_state($c);
    $self->clear_nonce($c);

    $callback->{on_finished}->(@args);
}

sub get_state {
    my($self, $c) = @_;
    my $state = $self->state // $c->session->get($self->state_session_key) // do {
        require String::Random;
        String::Random->new->randregex('[a-zA-Z0-9]{16}');
    };
    $self->set_state($c, $state);
    return $state;
}

sub set_state {
    my($self, $c, $state) = @_;
    return $c->session->set($self->state_session_key => $state);
}

sub clear_state {
    my($self, $c) = @_;
    return $c->session->remove($self->state_session_key);
}

sub get_nonce {
    my($self, $c) = @_;
    my $nonce = $self->nonce // $c->session->get($self->nonce_session_key) // do {
        require String::Random;
        String::Random->new->randregex('[a-zA-Z0-9]{16}');
    };
    $self->set_nonce($c, $nonce);
    return $nonce;
}

sub set_nonce {
    my($self, $c, $nonce) = @_;
    return $c->session->set($self->nonce_session_key => $nonce);
}

sub clear_nonce {
    my($self, $c) = @_;
    return $c->session->remove($self->nonce_session_key);
}

1;
__END__