<?php
/**
 * Copyright (c) 2012 Sam Tuke <samtuke@owncloud.com>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

require_once realpath( dirname( __FILE__ ) . '/../../../lib/base.php' );
require_once realpath( dirname( __FILE__ ) . '/../lib/crypt.php' );
require_once realpath( dirname( __FILE__ ) . '/../lib/keymanager.php' );
require_once realpath( dirname( __FILE__ ) . '/../lib/proxy.php' );
require_once realpath( dirname( __FILE__ ) . '/../lib/stream.php' );
require_once realpath( dirname( __FILE__ ) . '/../lib/util.php' );
require_once realpath( dirname( __FILE__ ) . '/../appinfo/app.php' );

use OCA\Encryption;

/**
 * Class Test_Encryption_Util
 */
class Test_Encryption_Util extends \PHPUnit_Framework_TestCase
{

	public $userId;
	public $encryptionDir;
	public $publicKeyDir;
	public $pass;
	/**
	 * @var OC_FilesystemView
	 */
	public $view;
	public $keyfilesPath;
	public $publicKeyPath;
	public $privateKeyPath;
	/**
	 * @var \OCA\Encryption\Util
	 */
	public $util;
	public $dataShort;
	public $legacyEncryptedData;
	public $legacyEncryptedDataKey;
	public $lagacyKey;

	function setUp() {
		// reset backend
		\OC_User::useBackend( 'database' );

		\OC_User::setUserId( 'admin' );
		$this->userId = 'admin';
		$this->pass = 'admin';

		// set content for encrypting / decrypting in tests
		$this->dataUrl = realpath( dirname( __FILE__ ) . '/../lib/crypt.php' );
		$this->dataShort = 'hats';
		$this->dataLong = file_get_contents( realpath( dirname( __FILE__ ) . '/../lib/crypt.php' ) );
		$this->legacyData = realpath( dirname( __FILE__ ) . '/legacy-text.txt' );
		$this->legacyEncryptedData = realpath( dirname( __FILE__ ) . '/legacy-encrypted-text.txt' );
		$this->legacyEncryptedDataKey = realpath( dirname( __FILE__ ) . '/encryption.key' );
		$this->lagacyKey = '62829813025828180801';

		$keypair = Encryption\Crypt::createKeypair();

		$this->genPublicKey = $keypair['publicKey'];
		$this->genPrivateKey = $keypair['privateKey'];

		$this->publicKeyDir = '/' . 'public-keys';
		$this->encryptionDir = '/' . $this->userId . '/' . 'files_encryption';
		$this->keyfilesPath = $this->encryptionDir . '/' . 'keyfiles';
		$this->publicKeyPath = $this->publicKeyDir . '/' . $this->userId . '.public.key'; // e.g. data/public-keys/admin.public.key
		$this->privateKeyPath = $this->encryptionDir . '/' . $this->userId . '.private.key'; // e.g. data/admin/admin.private.key

		$this->view = new \OC_FilesystemView( '/' );

		$userHome = \OC_User::getHome( $this->userId );
		$this->dataDir = str_replace( '/' . $this->userId, '', $userHome );

		// Filesystem related hooks
		\OCA\Encryption\Helper::registerFilesystemHooks();

		// clear and register hooks
		\OC_FileProxy::clearProxies();
		\OC_FileProxy::register( new OCA\Encryption\Proxy() );

		// setup filesystem
		\OC_Util::tearDownFS();
		\OC_User::setUserId( '' );
		\OC\Files\Filesystem::tearDown();
		\OC_Util::setupFS( $this->userId );
		\OC_User::setUserId( $this->userId );

		// login admin
		$params['uid'] = $this->userId;
		$params['password'] = $this->pass;
		OCA\Encryption\Hooks::login( $params );

		$this->util = new Encryption\Util( $this->view, $this->userId );
	}

	function tearDown() {
		// clear and register hooks
		\OC_FileProxy::clearProxies();
	}

	/**
	 * @brief test that paths set during User construction are correct
	 */
	function testKeyPaths() {
		$util = new Encryption\Util( $this->view, $this->userId );

		$this->assertEquals( $this->publicKeyDir, $util->getPath( 'publicKeyDir' ) );
		$this->assertEquals( $this->encryptionDir, $util->getPath( 'encryptionDir' ) );
		$this->assertEquals( $this->keyfilesPath, $util->getPath( 'keyfilesPath' ) );
		$this->assertEquals( $this->publicKeyPath, $util->getPath( 'publicKeyPath' ) );
		$this->assertEquals( $this->privateKeyPath, $util->getPath( 'privateKeyPath' ) );

	}

	/**
	 * @brief test setup of encryption directories
	 */
	function testSetupServerSide() {
		$this->assertEquals( true, $this->util->setupServerSide( $this->pass ) );
	}

	/**
	 * @brief test checking whether account is ready for encryption,
	 */
	function testUserIsReady() {
		$this->assertEquals( true, $this->util->ready() );
	}

	/**
	 * @brief test checking whether account is not ready for encryption,
	 */
	function testUserIsNotReady() {
		$this->view->unlink( $this->publicKeyDir );

		$params['uid'] = $this->userId;
		$params['password'] = $this->pass;
		$this->assertFalse( OCA\Encryption\Hooks::login( $params ) );

		$this->view->unlink( $this->privateKeyPath );
	}

	/**
	 * @brief test checking whether account is not ready for encryption,
	 */
	function testIsLagacyUser() {
		$userView = new \OC_FilesystemView( '/' . $this->userId );

		// Disable encryption proxy to prevent recursive calls
		$proxyStatus = \OC_FileProxy::$enabled;
		\OC_FileProxy::$enabled = false;

		$encryptionKeyContent = file_get_contents( $this->legacyEncryptedDataKey );
		$userView->file_put_contents( '/encryption.key', $encryptionKeyContent );

		\OC_FileProxy::$enabled = $proxyStatus;

		$params['uid'] = $this->userId;
		$params['password'] = $this->pass;

		$util = new Encryption\Util( $this->view, $this->userId );
		$util->setMigrationStatus( 0 );

		$this->assertTrue( OCA\Encryption\Hooks::login( $params ) );

		$this->assertEquals( $this->lagacyKey, $_SESSION['legacyKey'] );
	}

	function testRecoveryEnabledForUser() {

		$util = new Encryption\Util( $this->view, $this->userId );

		// Record the value so we can return it to it's original state later
		$enabled = $util->recoveryEnabledForUser();

		$this->assertTrue( $util->setRecoveryForUser( 1 ) );

		$this->assertEquals( 1, $util->recoveryEnabledForUser() );

		$this->assertTrue( $util->setRecoveryForUser( 0 ) );

		$this->assertEquals( 0, $util->recoveryEnabledForUser() );

		// Return the setting to it's previous state
		$this->assertTrue( $util->setRecoveryForUser( $enabled ) );

	}

	function testGetUidAndFilename() {

		\OC_User::setUserId( 'admin' );

		$filename = 'tmp-' . time() . '.test';

		// Disable encryption proxy to prevent recursive calls
		$proxyStatus = \OC_FileProxy::$enabled;
		\OC_FileProxy::$enabled = false;

		$this->view->file_put_contents( $this->userId . '/files/' . $filename, $this->dataShort );

		// Re-enable proxy - our work is done
		\OC_FileProxy::$enabled = $proxyStatus;

		$util = new Encryption\Util( $this->view, $this->userId );

		list( $fileOwnerUid, $file ) = $util->getUidAndFilename( $filename );

		$this->assertEquals( 'admin', $fileOwnerUid );

		$this->assertEquals( $file, $filename );

		$this->view->unlink( $this->userId . '/files/' . $filename );
	}

	function testIsSharedPath() {
		$sharedPath = '/user1/files/Shared/test';
		$path = '/user1/files/test';

		$this->assertTrue( $this->util->isSharedPath( $sharedPath ) );

		$this->assertFalse( $this->util->isSharedPath( $path ) );
	}

	function testEncryptLagacyFiles() {
		// login admin
		$params['uid'] = $this->userId;
		$params['password'] = $this->pass;
		OCA\Encryption\Hooks::login( $params );

		$userView = new \OC_FilesystemView( '/' . $this->userId );
		$view = new \OC_FilesystemView( '/' . $this->userId . '/files' );

		// Disable encryption proxy to prevent recursive calls
		$proxyStatus = \OC_FileProxy::$enabled;
		\OC_FileProxy::$enabled = false;

		$encryptionKeyContent = file_get_contents( $this->legacyEncryptedDataKey );
		$userView->file_put_contents( '/encryption.key', $encryptionKeyContent );

		$legacyEncryptedData = file_get_contents( $this->legacyEncryptedData );
		$view->mkdir( '/test/' );
		$view->mkdir( '/test/subtest/' );
		$view->file_put_contents( '/test/subtest/legacy-encrypted-text.txt', $legacyEncryptedData );

		$fileInfo = $view->getFileInfo( '/test/subtest/legacy-encrypted-text.txt' );
		$fileInfo['encrypted'] = true;
		$view->putFileInfo( '/test/subtest/legacy-encrypted-text.txt', $fileInfo );

		\OC_FileProxy::$enabled = $proxyStatus;

		$params['uid'] = $this->userId;
		$params['password'] = $this->pass;

		$util = new Encryption\Util( $this->view, $this->userId );
		$util->setMigrationStatus( 0 );

		$this->assertTrue( OCA\Encryption\Hooks::login( $params ) );

		$this->assertEquals( $this->lagacyKey, $_SESSION['legacyKey'] );

		$files = $util->findEncFiles( '/' . $this->userId . '/files/' );

		$this->assertTrue( is_array( $files ) );

		$found = false;
		foreach ( $files['encrypted'] as $encryptedFile ) {
			if ( $encryptedFile['name'] === 'legacy-encrypted-text.txt' ) {
				$found = true;
				break;
			}
		}

		$this->assertTrue( $found );
	}
}