#!/usr/bin/env perl

# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use Modern::Perl;

use Test::More;
use Test::MockModule;
use Test::Mojo;

use MIME::Base64;
use Module::Load::Conditional qw(can_load);

use Koha::ApiKeys;
use Koha::Database;
use Koha::Patrons;

use t::lib::Mocks;
use t::lib::TestBuilder;

my $t = Test::Mojo->new('Koha::REST::V1');
my $schema  = Koha::Database->new->schema;
my $builder = t::lib::TestBuilder->new();

if ( can_load( modules => { 'Net::OAuth2::AuthorizationServer' => undef } ) ) {
    plan tests => 2;
}
else {
    plan skip_all => 'Net::OAuth2::AuthorizationServer not available';
}

subtest '/oauth/token tests' => sub {

    plan tests => 10;

    t::lib::Mocks::mock_preference('RESTOAuth2ClientCredentials', 0);

    # Missing parameter grant_type
    $t->post_ok('/api/v1/oauth/token')
        ->status_is(400);

    # Wrong grant type
    $t->post_ok('/api/v1/oauth/token', form => { grant_type => 'password' })
        ->status_is(400)
        ->json_is({error => 'Unimplemented grant type'});

    t::lib::Mocks::mock_preference('RESTOAuth2ClientCredentials', 1);

    # No client_id/client_secret
    $t->post_ok('/api/v1/oauth/token', form => { grant_type => 'client_credentials' })
        ->status_is(403)
        ->json_is({error => 'unauthorized_client'});

    subtest 'Client credentials in body' => sub {

        plan tests => 19;

        run_oauth_tests( 'body' );
    };

    subtest 'Client credentials in Authorization header' => sub {


        plan tests => 19;

        run_oauth_tests( 'header' );
    };
};

subtest 'Net::OAuth2::AuthorizationServer missing tests' => sub {

    plan tests => 10;

    $schema->storage->txn_begin;

    my $load_conditional = Test::MockModule->new('Module::Load::Conditional');

    # Enable the client credentials grant syspref
    t::lib::Mocks::mock_preference( 'RESTOAuth2ClientCredentials', 1 );

    my $patron = $builder->build_object({ class => 'Koha::Patrons', value => { flags => 2**4 } });
    my $api_key = Koha::ApiKey->new({ patron_id => $patron->id, description => 'blah' })->store;

    my $form_data = {
        grant_type    => 'client_credentials',
        client_id     => $api_key->client_id,
        client_secret => $api_key->plain_text_secret
    };

    $t->post_ok( '/api/v1/oauth/token', form => $form_data )->status_is(200)
      ->json_is( '/expires_in' => 3600 )->json_is( '/token_type' => 'Bearer' )
      ->json_has('/access_token');

    my $access_token = $t->tx->res->json->{access_token};

    $load_conditional->mock( 'can_load', sub { return 0; } );

    my $tx = $t->ua->build_tx( GET => '/api/v1/patrons' );
    $tx->req->headers->authorization("Bearer $access_token");
    $t->request_ok($tx)
      ->status_is(403);

    $t->post_ok( '/api/v1/oauth/token', form => $form_data )
      ->status_is(400)
      ->json_is( { error => 'Unimplemented grant type' } );

    $schema->storage->txn_rollback;
};

sub run_oauth_tests {
    my ( $test_case ) = @_;

    $schema->storage->txn_begin;

    my $patron = $builder->build_object({
        class => 'Koha::Patrons',
        value  => {
            flags => 0 # no permissions
        },
    });

    my $api_key = Koha::ApiKey->new({ patron_id => $patron->id, description => 'blah' })->store;

    t::lib::Mocks::mock_preference( 'RESTOAuth2ClientCredentials', 1 );

    my $formData;
    my $client_id     = $api_key->client_id;
    my $client_secret = $api_key->plain_text_secret;

    if ( $test_case eq 'header' ) {

        $formData = { grant_type => 'client_credentials' };

        $t->post_ok("//$client_id:$client_secret@/api/v1/oauth/token", form => $formData)
          ->status_is(200)
          ->json_is('/expires_in' => 3600)
          ->json_is('/token_type' => 'Bearer')
          ->json_has('/access_token');
    } else {

        $formData = {
            grant_type    => 'client_credentials',
            client_id     => $api_key->client_id,
            client_secret => $api_key->plain_text_secret
        };

        $t->post_ok('/api/v1/oauth/token', form => $formData)
          ->status_is(200)
          ->json_is('/expires_in' => 3600)
          ->json_is('/token_type' => 'Bearer')
          ->json_has('/access_token');
    }

    my $access_token = $t->tx->res->json->{access_token};

    # Without access token, it returns 401
    $t->get_ok('/api/v1/patrons')->status_is(401);

    # With access token, but without permissions, it returns 403
    my $tx = $t->ua->build_tx(GET => '/api/v1/patrons');
    $tx->req->headers->authorization("Bearer $access_token");
    $t->request_ok($tx)->status_is(403);

    # With access token and permissions, it returns 200
    $patron->flags(2**4)->store;
    $tx = $t->ua->build_tx(GET => '/api/v1/patrons');
    $tx->req->headers->authorization("Bearer $access_token");
    $t->request_ok($tx)->status_is(200);

    # expire token
    my $token = Koha::OAuthAccessTokens->find($access_token);
    $token->expires( time - 1 )->store;
    $tx = $t->ua->build_tx( GET => '/api/v1/patrons' );
    $tx->req->headers->authorization("Bearer $access_token");
    $t->request_ok($tx)
      ->status_is(401);

    # revoke key
    $api_key->active(0)->store;

    if ( $test_case eq 'header' ) {
        $t->post_ok("//$client_id:$client_secret@/api/v1/oauth/token", form => $formData)
          ->status_is(403)
          ->json_is({ error => 'unauthorized_client' });
    } else {
        $t->post_ok('/api/v1/oauth/token', form => $formData)
          ->status_is(403)
          ->json_is({ error => 'unauthorized_client' });
    }

    # disable client credentials grant
   t::lib::Mocks::mock_preference('RESTOAuth2ClientCredentials', 0);

    # enable API key
    $api_key->active(1)->store;

    # Wrong grant type
    if ( $test_case eq 'header' ) {
        $t->post_ok("//$client_id:$client_secret@/api/v1/oauth/token", form => $formData )
          ->status_is(400)
          ->json_is({ error => 'Unimplemented grant type' });
    }
    else {
        $t->post_ok('/api/v1/oauth/token', form => $formData )
          ->status_is(400)
          ->json_is({ error => 'Unimplemented grant type' });
    }

    $schema->storage->txn_rollback;
}