class PermissionsHashGeneratorTest

class PermissionsHashGeneratorTest extends UnitTestCase {
    
    /**
     * The mocked super user account.
     *
     * @var \Drupal\user\UserInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $account1;
    
    /**
     * A mocked account.
     *
     * @var \Drupal\user\UserInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $account2;
    
    /**
     * An "updated" mocked account.
     *
     * @var \Drupal\user\UserInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $account2Updated;
    
    /**
     * A different account.
     *
     * @var \Drupal\user\UserInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $account3;
    
    /**
     * The mocked private key service.
     *
     * @var \Drupal\Core\PrivateKey|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $privateKey;
    
    /**
     * The mocked cache backend.
     *
     * @var \Drupal\Core\Cache\CacheBackendInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $cache;
    
    /**
     * The mocked cache backend.
     *
     * @var \Drupal\Core\Cache\CacheBackendInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $staticCache;
    
    /**
     * The permission hash class being tested.
     *
     * @var \Drupal\Core\Session\PermissionsHashGeneratorInterface
     */
    protected $permissionsHash;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        new Settings([
            'hash_salt' => 'test',
        ]);
        // The mocked super user account, with the same roles as Account 2.
        $this->account1 = $this->getMockBuilder('Drupal\\user\\Entity\\User')
            ->disableOriginalConstructor()
            ->onlyMethods([
            'getRoles',
            'id',
        ])
            ->getMock();
        $this->account1
            ->expects($this->any())
            ->method('id')
            ->willReturn(1);
        $this->account1
            ->expects($this->never())
            ->method('getRoles');
        // Account 2: 'administrator' and 'authenticated' roles.
        $roles_1 = [
            'administrator',
            'authenticated',
        ];
        $this->account2 = $this->getMockBuilder('Drupal\\user\\Entity\\User')
            ->disableOriginalConstructor()
            ->onlyMethods([
            'getRoles',
            'id',
        ])
            ->getMock();
        $this->account2
            ->expects($this->any())
            ->method('getRoles')
            ->willReturn($roles_1);
        $this->account2
            ->expects($this->any())
            ->method('id')
            ->willReturn(2);
        // Account 3: 'authenticated' and 'administrator' roles (different order).
        $roles_3 = [
            'authenticated',
            'administrator',
        ];
        $this->account3 = $this->getMockBuilder('Drupal\\user\\Entity\\User')
            ->disableOriginalConstructor()
            ->onlyMethods([
            'getRoles',
            'id',
        ])
            ->getMock();
        $this->account3
            ->expects($this->any())
            ->method('getRoles')
            ->willReturn($roles_3);
        $this->account3
            ->expects($this->any())
            ->method('id')
            ->willReturn(3);
        // Updated account 2: now also 'editor' role.
        $roles_2_updated = [
            'editor',
            'administrator',
            'authenticated',
        ];
        $this->account2Updated = $this->getMockBuilder('Drupal\\user\\Entity\\User')
            ->disableOriginalConstructor()
            ->onlyMethods([
            'getRoles',
            'id',
        ])
            ->getMock();
        $this->account2Updated
            ->expects($this->any())
            ->method('getRoles')
            ->willReturn($roles_2_updated);
        $this->account2Updated
            ->expects($this->any())
            ->method('id')
            ->willReturn(2);
        // Mocked private key + cache services.
        $random = Crypt::randomBytesBase64(55);
        $this->privateKey = $this->getMockBuilder('Drupal\\Core\\PrivateKey')
            ->disableOriginalConstructor()
            ->onlyMethods([
            'get',
        ])
            ->getMock();
        $this->privateKey
            ->expects($this->any())
            ->method('get')
            ->willReturn($random);
        $this->cache = $this->getMockBuilder('Drupal\\Core\\Cache\\CacheBackendInterface')
            ->disableOriginalConstructor()
            ->getMock();
        $this->staticCache = $this->getMockBuilder('Drupal\\Core\\Cache\\CacheBackendInterface')
            ->disableOriginalConstructor()
            ->getMock();
        $this->permissionsHash = new PermissionsHashGenerator($this->privateKey, $this->cache, $this->staticCache);
    }
    
    /**
     * @covers ::generate
     */
    public function testGenerate() {
        // Ensure that the super user (user 1) always gets the same hash.
        $super_user_hash = $this->permissionsHash
            ->generate($this->account1);
        // Ensure that two user accounts with the same roles generate the same hash.
        $hash_2 = $this->permissionsHash
            ->generate($this->account2);
        $hash_3 = $this->permissionsHash
            ->generate($this->account3);
        $this->assertSame($hash_2, $hash_3, 'Different users with the same roles generate the same permissions hash.');
        $this->assertNotSame($hash_2, $super_user_hash, 'User 1 has a different hash despite having the same roles');
        // Compare with hash for user account 1 with an additional role.
        $updated_hash_2 = $this->permissionsHash
            ->generate($this->account2Updated);
        $this->assertNotSame($hash_2, $updated_hash_2, 'Same user with updated roles generates different permissions hash.');
    }
    
    /**
     * @covers ::generate
     */
    public function testGeneratePersistentCache() {
        // Set expectations for the mocked cache backend.
        $expected_cid = 'user_permissions_hash:administrator,authenticated';
        $mock_cache = new \stdClass();
        $mock_cache->data = 'test_hash_here';
        $this->staticCache
            ->expects($this->once())
            ->method('get')
            ->with($expected_cid)
            ->willReturn(FALSE);
        $this->staticCache
            ->expects($this->once())
            ->method('set')
            ->with($expected_cid, $this->isType('string'));
        $this->cache
            ->expects($this->once())
            ->method('get')
            ->with($expected_cid)
            ->willReturn($mock_cache);
        $this->cache
            ->expects($this->never())
            ->method('set');
        $this->permissionsHash
            ->generate($this->account2);
    }
    
    /**
     * @covers ::generate
     */
    public function testGenerateStaticCache() {
        // Set expectations for the mocked cache backend.
        $expected_cid = 'user_permissions_hash:administrator,authenticated';
        $mock_cache = new \stdClass();
        $mock_cache->data = 'test_hash_here';
        $this->staticCache
            ->expects($this->once())
            ->method('get')
            ->with($expected_cid)
            ->willReturn($mock_cache);
        $this->staticCache
            ->expects($this->never())
            ->method('set');
        $this->cache
            ->expects($this->never())
            ->method('get');
        $this->cache
            ->expects($this->never())
            ->method('set');
        $this->permissionsHash
            ->generate($this->account2);
    }
    
    /**
     * Tests the generate method with no cache returned.
     */
    public function testGenerateNoCache() {
        // Set expectations for the mocked cache backend.
        $expected_cid = 'user_permissions_hash:administrator,authenticated';
        $this->staticCache
            ->expects($this->once())
            ->method('get')
            ->with($expected_cid)
            ->willReturn(FALSE);
        $this->staticCache
            ->expects($this->once())
            ->method('set')
            ->with($expected_cid, $this->isType('string'));
        $this->cache
            ->expects($this->once())
            ->method('get')
            ->with($expected_cid)
            ->willReturn(FALSE);
        $this->cache
            ->expects($this->once())
            ->method('set')
            ->with($expected_cid, $this->isType('string'));
        $this->permissionsHash
            ->generate($this->account2);
    }

}