<?php

/* The MIT License (MIT)
*
* Copyright (c) 2022 Petr Muzikant <pmuzikant@email.cz>
*
* > Permission is hereby granted, free of charge, to any person obtaining a copy
* > of this software and associated documentation files (the "Software"), to deal
* > in the Software without restriction, including without limitation the rights
* > to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* > copies of the Software, and to permit persons to whom the Software is
* > furnished to do so, subject to the following conditions:
* >
* > The above copyright notice and this permission notice shall be included in
* > all copies or substantial portions of the Software.
* >
* > THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* > IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* > FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* > AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* > LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* > OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* > THE SOFTWARE.
*/

declare(strict_types=1);

namespace muzosh\web_eid_authtoken_validation_php\challenge;

use muzosh\web_eid_authtoken_validation_php\exceptions\ChallengeNonceExpiredException;
use muzosh\web_eid_authtoken_validation_php\exceptions\ChallengeNonceNotFoundException;
use PHPUnit\Framework\TestCase;

/**
 * @internal
 * @coversNothing
 */
class ChallengeNonceGeneratorTest extends TestCase
{
    private ChallengeNonceStore $challengeNonceStore;

    protected function setUp(): void
    {
        $this->challengeNonceStore = new InMemoryChallengeNonceStore();
    }

    public function testValidateNonceGeneration(): void
    {
        $challengeNonceGenerator = (new ChallengeNonceGeneratorBuilder())->withChallengeNonceStore($this->challengeNonceStore)->withNonceTtl(1)->build();

        $nonce1 = $challengeNonceGenerator->generateAndStoreNonce();
        $nonce2 = $challengeNonceGenerator->generateAndStoreNonce();
		$nonce2fromStore = $this->challengeNonceStore->getAndRemove();

		$this->assertEquals($nonce2, $nonce2fromStore);

        // Base64-encoded 32 bytes = 44 strlen
        $this->assertTrue(44 == strlen($nonce1->getBase64EncodedNonce()));
        $this->assertNotEquals($nonce1->getBase64EncodedNonce(), $nonce2->getBase64EncodedNonce());

        // It might be possible to add an entropy test by compressing the nonce bytes
        // and verifying that the result is longer than for non-random strings.
    }

    public function testValidateUnexpiredNonce()
    {
        $this->expectNotToPerformAssertions();

        $challengeNonceGenerator = (new ChallengeNonceGeneratorBuilder())->withChallengeNonceStore($this->challengeNonceStore)->withNonceTtl(2)->build();

        $challengeNonceGenerator->generateAndStoreNonce();

        sleep(1);

        $this->challengeNonceStore->getAndRemove();
    }

    public function testValidateNonceExpiration()
    {
        $this->expectException(ChallengeNonceExpiredException::class);
        $challengeNonceGenerator = (new ChallengeNonceGeneratorBuilder())->withChallengeNonceStore($this->challengeNonceStore)->withNonceTtl(1)->build();

        $challengeNonceGenerator->generateAndStoreNonce();

        sleep(2);

        $this->challengeNonceStore->getAndRemove();
    }

    public function testValidateNonceNotFound()
    {
        $this->expectException(ChallengeNonceNotFoundException::class);
        $this->challengeNonceStore->getAndRemove();
    }
}
