# Self U2F registration
package Lemonldap::NG::Portal::2F::Register::U2F;

use strict;
use Mouse;

our $VERSION = '2.0.0';

extends 'Lemonldap::NG::Portal::Lib::U2F';

# INITIALIZATION

has prefix => ( is => 'rw', default => 'u' );

has template => ( is => 'ro', default => 'u2fregister' );

sub init {
    my ($self) = @_;
    return 0 unless $self->SUPER::init;
    return 1;
}

# RUNNING METHODS

# Main method
sub run {
    my ( $self, $req, $action ) = @_;

    if ( $action eq 'register' ) {
        my $challenge = $self->crypter->registrationChallenge;
        return [ 200, [ 'Content-Type' => 'application/json' ], [$challenge] ];
    }
    if ( $action eq 'registration' ) {
        my ( $resp, $challenge );
        unless ($resp = $req->param('registration')
            and $challenge = $req->param('challenge') )
        {
            return $self->p->sendError( $req, 'Missing registration parameter',
                400 );
        }
        $self->logger->debug("Get registration data $resp");
        $self->logger->debug("Get challenge $challenge");
        eval { $challenge = JSON::from_json($challenge)->{challenge} };
        if ($@) {
            $self->userLogger->error("Bad challenge: $@");
            return $self->p->sendError( $req, 'Bad challenge', 400 );
        }
        my $c = $self->crypter;
        if ( $c->setChallenge($challenge) ) {
            my ( $keyHandle, $userKey ) = $c->registrationVerify($resp);
            if ( $keyHandle and $userKey ) {
                $self->p->updatePersistentSession(
                    $req,
                    {
                        _u2fKeyHandle =>
                          $self->encode_base64url( $keyHandle, '' ),
                        _u2fUserKey => $self->encode_base64url( $userKey, '' )
                    }
                );
                return [
                    200, [ 'Content-Type' => 'application/json' ],
                    ['{"result":1}']
                ];
            }
        }
        my $err = Crypt::U2F::Server::Simple::lastError();
        $self->userLogger->warn("U2F Registration failed: $err");
        return $self->p->sendError( $req, $err, 200 );
    }

    if ( $action eq 'unregister' ) {
        my $challenge = $self->crypter->registrationChallenge;
        return [ 200, [ 'Content-Type' => 'application/json' ], [$challenge] ];
    }
    if ( $action eq 'unregistration' ) {
        $self->p->updatePersistentSession(
            $req,
            {
                _u2fKeyHandle => '',
                _u2fUserKey   => ''
            }
        );
        $self->userLogger->notice('U2F key unregistration succeed');
        return [ 200, [ 'Content-Type' => 'application/json' ],
            ['{"result":1}'] ];
        my $err = Crypt::U2F::Server::Simple::lastError();
        $self->userLogger->warn("U2F Unregistration failed: $err");
        return $self->p->sendError( $req, $err, 200 );
    }

    if ( $action eq 'verify' ) {
        my ( $err, $error ) = $self->loadUser($req);
        if ( $err == -1 ) {
            return $self->p->sendError( $req, "U2F error: $error", 200 );
        }
        elsif ( $err == 0 ) {
            return $self->p->sendError( $req, "noU2FKeyFound" );
        }
        my $challenge = $req->datas->{crypter}->authenticationChallenge;
        return [ 200, [ 'Content-Type' => 'application/json' ], [$challenge] ];
    }
    if ( $action eq 'signature' ) {
        my $resp;
        unless ( $resp = $req->param('signature') ) {
            return $self->p->sendError( $req, 'Missing signature parameter',
                400 );
        }
        my ( $err, $error ) = $self->loadUser($req);
        if ( $err == -1 ) {
            return $self->p->sendError( $req, "U2F error: $error", 200 );
        }
        elsif ( $err == 0 ) {
            return $self->p->sendError( $req, "noU2FKeyFound" );
        }
        my $res =
          ( $req->datas->{crypter}->authenticationVerify($resp) ? 1 : 0 );

        #$self->userLogger->notice("res=$res");
        return [
            200, [ 'Content-Type' => 'application/json' ],
            [qq'{"result":$res}']
        ];
    }
}

sub loadUser {
    my ( $self, $req ) = @_;
    my $uid     = $req->userData->{ $self->conf->{whatToTrace} };
    my $session = $self->p->getPersistentSession($uid);
    my $kh      = $session->data->{_u2fKeyHandle};
    my $uk      = $session->data->{_u2fUserKey};
    unless ( $kh and $uk ) {
        return 0;
    }
    $req->datas->{crypter} = $self->crypter(
        keyHandle => $self->decode_base64url($kh),
        publicKey => $self->decode_base64url($uk)
    );
    unless ( $req->datas->{crypter} ) {
        my $error = Crypt::U2F::Server::Simple::lastError();
        return ( -1, $error );
    }
    return 1;
}

1;