<?php
/**
 * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */
namespace OCA\OAuth2\Tests\Controller;

use OC\Authentication\Exceptions\ExpiredTokenException;
use OC\Authentication\Exceptions\InvalidTokenException;
use OC\Authentication\Token\IProvider as TokenProvider;
use OC\Authentication\Token\PublicKeyToken;
use OCA\OAuth2\Controller\OauthApiController;
use OCA\OAuth2\Db\AccessToken;
use OCA\OAuth2\Db\AccessTokenMapper;
use OCA\OAuth2\Db\Client;
use OCA\OAuth2\Db\ClientMapper;
use OCA\OAuth2\Exceptions\AccessTokenNotFoundException;
use OCA\OAuth2\Exceptions\ClientNotFoundException;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\JSONResponse;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IRequest;
use OCP\Security\Bruteforce\IThrottler;
use OCP\Security\ICrypto;
use OCP\Security\ISecureRandom;
use Psr\Log\LoggerInterface;
use Test\TestCase;

/* We have to use this to add a property to the mocked request and avoid warnings about dynamic properties on PHP>=8.2 */
abstract class RequestMock implements IRequest {
	public array $server = [];
}

class OauthApiControllerTest extends TestCase {
	/** @var IRequest|\PHPUnit\Framework\MockObject\MockObject */
	private $request;
	/** @var ICrypto|\PHPUnit\Framework\MockObject\MockObject */
	private $crypto;
	/** @var AccessTokenMapper|\PHPUnit\Framework\MockObject\MockObject */
	private $accessTokenMapper;
	/** @var ClientMapper|\PHPUnit\Framework\MockObject\MockObject */
	private $clientMapper;
	/** @var TokenProvider|\PHPUnit\Framework\MockObject\MockObject */
	private $tokenProvider;
	/** @var ISecureRandom|\PHPUnit\Framework\MockObject\MockObject */
	private $secureRandom;
	/** @var ITimeFactory|\PHPUnit\Framework\MockObject\MockObject */
	private $time;
	/** @var IThrottler|\PHPUnit\Framework\MockObject\MockObject */
	private $throttler;
	/** @var LoggerInterface|\PHPUnit\Framework\MockObject\MockObject */
	private $logger;
	/** @var ITimeFactory|\PHPUnit\Framework\MockObject\MockObject */
	private $timeFactory;
	/** @var OauthApiController */
	private $oauthApiController;

	protected function setUp(): void {
		parent::setUp();

		$this->request = $this->createMock(RequestMock::class);
		$this->crypto = $this->createMock(ICrypto::class);
		$this->accessTokenMapper = $this->createMock(AccessTokenMapper::class);
		$this->clientMapper = $this->createMock(ClientMapper::class);
		$this->tokenProvider = $this->createMock(TokenProvider::class);
		$this->secureRandom = $this->createMock(ISecureRandom::class);
		$this->time = $this->createMock(ITimeFactory::class);
		$this->throttler = $this->createMock(IThrottler::class);
		$this->logger = $this->createMock(LoggerInterface::class);
		$this->timeFactory = $this->createMock(ITimeFactory::class);

		$this->oauthApiController = new OauthApiController(
			'oauth2',
			$this->request,
			$this->crypto,
			$this->accessTokenMapper,
			$this->clientMapper,
			$this->tokenProvider,
			$this->secureRandom,
			$this->time,
			$this->logger,
			$this->throttler,
			$this->timeFactory
		);
	}

	public function testGetTokenInvalidGrantType(): void {
		$expected = new JSONResponse([
			'error' => 'invalid_grant',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_grant' => 'foo']);

		$this->assertEquals($expected, $this->oauthApiController->getToken('foo', null, null, null, null));
	}

	public function testGetTokenInvalidCode(): void {
		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'token not found', 'code' => 'invalidcode']);

		$this->accessTokenMapper->method('getByCode')
			->with('invalidcode')
			->willThrowException(new AccessTokenNotFoundException());

		$this->assertEquals($expected, $this->oauthApiController->getToken('authorization_code', 'invalidcode', null, null, null));
	}

	public function testGetTokenExpiredCode(): void {
		$codeCreatedAt = 100;
		$expiredSince = 123;

		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'authorization_code_expired', 'expired_since' => $expiredSince]);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setCodeCreatedAt($codeCreatedAt);

		$this->accessTokenMapper->method('getByCode')
			->with('validcode')
			->willReturn($accessToken);

		$tsNow = $codeCreatedAt + OauthApiController::AUTHORIZATION_CODE_EXPIRES_AFTER + $expiredSince;
		$dateNow = (new \DateTimeImmutable())->setTimestamp($tsNow);
		$this->timeFactory->method('now')
			->willReturn($dateNow);

		$this->assertEquals($expected, $this->oauthApiController->getToken('authorization_code', 'validcode', null, null, null));
	}

	public function testGetTokenWithCodeForActiveToken(): void {
		// if a token has already delivered oauth tokens,
		// it should not be possible to get a new oauth token from a valid authorization code
		$codeCreatedAt = 100;

		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'authorization_code_received_for_active_token']);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setCodeCreatedAt($codeCreatedAt);
		$accessToken->setTokenCount(1);

		$this->accessTokenMapper->method('getByCode')
			->with('validcode')
			->willReturn($accessToken);

		$tsNow = $codeCreatedAt + 1;
		$dateNow = (new \DateTimeImmutable())->setTimestamp($tsNow);
		$this->timeFactory->method('now')
			->willReturn($dateNow);

		$this->assertEquals($expected, $this->oauthApiController->getToken('authorization_code', 'validcode', null, null, null));
	}

	public function testGetTokenClientDoesNotExist(): void {
		// In this test, the token's authorization code is valid and has not expired
		// and we check what happens when the associated Oauth client does not exist
		$codeCreatedAt = 100;

		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'client not found', 'client_id' => 42]);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setCodeCreatedAt($codeCreatedAt);

		$this->accessTokenMapper->method('getByCode')
			->with('validcode')
			->willReturn($accessToken);

		// 'now' is before the token's authorization code expiration
		$tsNow = $codeCreatedAt + OauthApiController::AUTHORIZATION_CODE_EXPIRES_AFTER - 1;
		$dateNow = (new \DateTimeImmutable())->setTimestamp($tsNow);
		$this->timeFactory->method('now')
			->willReturn($dateNow);

		$this->clientMapper->method('getByUid')
			->with(42)
			->willThrowException(new ClientNotFoundException());

		$this->assertEquals($expected, $this->oauthApiController->getToken('authorization_code', 'validcode', null, null, null));
	}

	public function testRefreshTokenInvalidRefreshToken(): void {
		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'token not found', 'code' => 'invalidrefresh']);

		$this->accessTokenMapper->method('getByCode')
			->with('invalidrefresh')
			->willThrowException(new AccessTokenNotFoundException());

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'invalidrefresh', null, null));
	}

	public function testRefreshTokenClientDoesNotExist(): void {
		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'client not found', 'client_id' => 42]);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$this->clientMapper->method('getByUid')
			->with(42)
			->willThrowException(new ClientNotFoundException());

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', null, null));
	}

	public function invalidClientProvider() {
		return [
			['invalidClientId', 'invalidClientSecret'],
			['clientId', 'invalidClientSecret'],
			['invalidClientId', 'clientSecret'],
		];
	}

	/**
	 * @dataProvider invalidClientProvider
	 *
	 * @param string $clientId
	 * @param string $clientSecret
	 */
	public function testRefreshTokenInvalidClient($clientId, $clientSecret): void {
		$expected = new JSONResponse([
			'error' => 'invalid_client',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_client' => 'client ID or secret does not match']);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$this->crypto
			->method('calculateHMAC')
			->with($this->callback(function (string $text) {
				return $text === 'clientSecret' || $text === 'invalidClientSecret';
			}))
			->willReturnCallback(function (string $text) {
				return $text === 'clientSecret'
					? 'hashedClientSecret'
					: 'hashedInvalidClientSecret';
			});

		$client = new Client();
		$client->setClientIdentifier('clientId');
		$client->setSecret(bin2hex('hashedClientSecret'));
		$this->clientMapper->method('getByUid')
			->with(42)
			->willReturn($client);

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', $clientId, $clientSecret));
	}

	public function testRefreshTokenInvalidAppToken(): void {
		$expected = new JSONResponse([
			'error' => 'invalid_request',
		], Http::STATUS_BAD_REQUEST);
		$expected->throttle(['invalid_request' => 'token is invalid']);

		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setTokenId(1337);
		$accessToken->setEncryptedToken('encryptedToken');

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$client = new Client();
		$client->setClientIdentifier('clientId');
		$client->setSecret(bin2hex('hashedClientSecret'));
		$this->clientMapper->method('getByUid')
			->with(42)
			->willReturn($client);

		$this->crypto
			->method('decrypt')
			->with('encryptedToken')
			->willReturn('decryptedToken');

		$this->crypto
			->method('calculateHMAC')
			->with('clientSecret')
			->willReturn('hashedClientSecret');

		$this->tokenProvider->method('getTokenById')
			->with(1337)
			->willThrowException(new InvalidTokenException());

		$this->accessTokenMapper->expects($this->once())
			->method('delete')
			->with($accessToken);

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', 'clientId', 'clientSecret'));
	}

	public function testRefreshTokenValidAppToken(): void {
		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setTokenId(1337);
		$accessToken->setEncryptedToken('encryptedToken');

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$client = new Client();
		$client->setClientIdentifier('clientId');
		$client->setSecret(bin2hex('hashedClientSecret'));
		$this->clientMapper->method('getByUid')
			->with(42)
			->willReturn($client);

		$this->crypto
			->method('decrypt')
			->with('encryptedToken')
			->willReturn('decryptedToken');

		$this->crypto
			->method('calculateHMAC')
			->with('clientSecret')
			->willReturn('hashedClientSecret');

		$appToken = new PublicKeyToken();
		$appToken->setUid('userId');
		$this->tokenProvider->method('getTokenById')
			->with(1337)
			->willThrowException(new ExpiredTokenException($appToken));

		$this->accessTokenMapper->expects($this->never())
			->method('delete')
			->with($accessToken);

		$this->secureRandom->method('generate')
			->willReturnCallback(function ($len) {
				return 'random' . $len;
			});

		$this->tokenProvider->expects($this->once())
			->method('rotate')
			->with(
				$appToken,
				'decryptedToken',
				'random72'
			)->willReturn($appToken);

		$this->time->method('getTime')
			->willReturn(1000);

		$this->tokenProvider->expects($this->once())
			->method('updateToken')
			->with(
				$this->callback(function (PublicKeyToken $token) {
					return $token->getExpires() === 4600;
				})
			);

		$this->crypto->method('encrypt')
			->with('random72', 'random128')
			->willReturn('newEncryptedToken');

		$this->accessTokenMapper->expects($this->once())
			->method('update')
			->with(
				$this->callback(function (AccessToken $token) {
					return $token->getHashedCode() === hash('sha512', 'random128') &&
						$token->getEncryptedToken() === 'newEncryptedToken';
				})
			);

		$expected = new JSONResponse([
			'access_token' => 'random72',
			'token_type' => 'Bearer',
			'expires_in' => 3600,
			'refresh_token' => 'random128',
			'user_id' => 'userId',
		]);

		$this->request->method('getRemoteAddress')
			->willReturn('1.2.3.4');

		$this->throttler->expects($this->once())
			->method('resetDelay')
			->with(
				'1.2.3.4',
				'login',
				['user' => 'userId']
			);

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', 'clientId', 'clientSecret'));
	}

	public function testRefreshTokenValidAppTokenBasicAuth(): void {
		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setTokenId(1337);
		$accessToken->setEncryptedToken('encryptedToken');

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$client = new Client();
		$client->setClientIdentifier('clientId');
		$client->setSecret(bin2hex('hashedClientSecret'));
		$this->clientMapper->method('getByUid')
			->with(42)
			->willReturn($client);

		$this->crypto
			->method('decrypt')
			->with('encryptedToken')
			->willReturn('decryptedToken');

		$this->crypto
			->method('calculateHMAC')
			->with('clientSecret')
			->willReturn('hashedClientSecret');

		$appToken = new PublicKeyToken();
		$appToken->setUid('userId');
		$this->tokenProvider->method('getTokenById')
			->with(1337)
			->willThrowException(new ExpiredTokenException($appToken));

		$this->accessTokenMapper->expects($this->never())
			->method('delete')
			->with($accessToken);

		$this->secureRandom->method('generate')
			->willReturnCallback(function ($len) {
				return 'random' . $len;
			});

		$this->tokenProvider->expects($this->once())
			->method('rotate')
			->with(
				$appToken,
				'decryptedToken',
				'random72'
			)->willReturn($appToken);

		$this->time->method('getTime')
			->willReturn(1000);

		$this->tokenProvider->expects($this->once())
			->method('updateToken')
			->with(
				$this->callback(function (PublicKeyToken $token) {
					return $token->getExpires() === 4600;
				})
			);

		$this->crypto->method('encrypt')
			->with('random72', 'random128')
			->willReturn('newEncryptedToken');

		$this->accessTokenMapper->expects($this->once())
			->method('update')
			->with(
				$this->callback(function (AccessToken $token) {
					return $token->getHashedCode() === hash('sha512', 'random128') &&
						$token->getEncryptedToken() === 'newEncryptedToken';
				})
			);

		$expected = new JSONResponse([
			'access_token' => 'random72',
			'token_type' => 'Bearer',
			'expires_in' => 3600,
			'refresh_token' => 'random128',
			'user_id' => 'userId',
		]);

		$this->request->server['PHP_AUTH_USER'] = 'clientId';
		$this->request->server['PHP_AUTH_PW'] = 'clientSecret';

		$this->request->method('getRemoteAddress')
			->willReturn('1.2.3.4');

		$this->throttler->expects($this->once())
			->method('resetDelay')
			->with(
				'1.2.3.4',
				'login',
				['user' => 'userId']
			);

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', null, null));
	}

	public function testRefreshTokenExpiredAppToken(): void {
		$accessToken = new AccessToken();
		$accessToken->setClientId(42);
		$accessToken->setTokenId(1337);
		$accessToken->setEncryptedToken('encryptedToken');

		$this->accessTokenMapper->method('getByCode')
			->with('validrefresh')
			->willReturn($accessToken);

		$client = new Client();
		$client->setClientIdentifier('clientId');
		$client->setSecret(bin2hex('hashedClientSecret'));
		$this->clientMapper->method('getByUid')
			->with(42)
			->willReturn($client);

		$this->crypto
			->method('decrypt')
			->with('encryptedToken')
			->willReturn('decryptedToken');

		$this->crypto
			->method('calculateHMAC')
			->with('clientSecret')
			->willReturn('hashedClientSecret');

		$appToken = new PublicKeyToken();
		$appToken->setUid('userId');
		$this->tokenProvider->method('getTokenById')
			->with(1337)
			->willReturn($appToken);

		$this->accessTokenMapper->expects($this->never())
			->method('delete')
			->with($accessToken);

		$this->secureRandom->method('generate')
			->willReturnCallback(function ($len) {
				return 'random' . $len;
			});

		$this->tokenProvider->expects($this->once())
			->method('rotate')
			->with(
				$appToken,
				'decryptedToken',
				'random72'
			)->willReturn($appToken);

		$this->time->method('getTime')
			->willReturn(1000);

		$this->tokenProvider->expects($this->once())
			->method('updateToken')
			->with(
				$this->callback(function (PublicKeyToken $token) {
					return $token->getExpires() === 4600;
				})
			);

		$this->crypto->method('encrypt')
			->with('random72', 'random128')
			->willReturn('newEncryptedToken');

		$this->accessTokenMapper->expects($this->once())
			->method('update')
			->with(
				$this->callback(function (AccessToken $token) {
					return $token->getHashedCode() === hash('sha512', 'random128') &&
						$token->getEncryptedToken() === 'newEncryptedToken';
				})
			);

		$expected = new JSONResponse([
			'access_token' => 'random72',
			'token_type' => 'Bearer',
			'expires_in' => 3600,
			'refresh_token' => 'random128',
			'user_id' => 'userId',
		]);

		$this->request->method('getRemoteAddress')
			->willReturn('1.2.3.4');

		$this->throttler->expects($this->once())
			->method('resetDelay')
			->with(
				'1.2.3.4',
				'login',
				['user' => 'userId']
			);

		$this->assertEquals($expected, $this->oauthApiController->getToken('refresh_token', null, 'validrefresh', 'clientId', 'clientSecret'));
	}
}