<?php
/**
* @brief API Dispatcher
* @author <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
* @copyright (c) Invision Power Services, Inc.
* @license https://www.invisioncommunity.com/legal/standards/
* @package Invision Community
* @since 3 Dec 2015
*/
namespace IPS\Dispatcher;
/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
exit;
}
/**
* @brief API Dispatcher
*/
class _Api extends \IPS\Dispatcher
{
/**
* @brief Controller Location
*/
public $controllerLocation = 'api';
/**
* @brief Path
*/
public $path = NULL;
/**
* @brief Raw API Key
*/
public $rawApiKey = NULL;
/**
* @brief Raw Access Token
*/
public $rawAccessToken = NULL;
/**
* @brief API Key Object
*/
public $apiKey = NULL;
/**
* @brief Access Token Details
*/
public $accessToken = NULL;
/**
* @brief Language
*/
public $language = NULL;
/**
* Can the Response be cached?
*
* @var bool
*/
public bool $cacheResponse = TRUE;
/**
* Init
*
* @return void
* @throws \DomainException
*/
public function init()
{
try
{
/* Get the path */
$this->_setPath();
/* Check our IP address isn't banned */
$this->_checkIpAddressIsAllowed();
/* Set our credentials */
$this->_setRawCredentials();
if ( $this->rawAccessToken )
{
$this->_setAccessToken();
if ( !$this->accessToken['scope'] or !json_decode( $this->accessToken['scope'] ) )
{
throw new \IPS\Api\Exception( 'NO_SCOPES', '3S290/B', 401, 'insufficient_scope' );
}
}
elseif ( $this->rawApiKey )
{
$this->_setApiKey();
}
else
{
throw new \IPS\Api\Exception( 'NO_API_KEY', '2S290/6', 401 );
}
/* Set other data */
$this->_setLanguage();
/* We don't want to cache any output for Zapier Requests */
if( \IPS\Request::i()->isZapier() )
{
$this->cacheResponse = FALSE;
}
}
catch ( \IPS\Api\Exception $e )
{
/* Build response */
$response = json_encode( array( 'errorCode' => $e->exceptionCode, 'errorMessage' => $e->getMessage() ), JSON_PRETTY_PRINT );
/* Do we need to log this? */
if ( $this->rawApiKey !== 'test' and \in_array( $e->exceptionCode, array( '2S290/8', '2S290/B', '3S290/7', '3S290/9' ) ) )
{
$this->_log( $response, $e->getCode(), \in_array( $e->exceptionCode, array( '3S290/7', '3S290/9', '3S290/B' ) ) );
}
/* Output */
$this->_respond( $response, $e->getCode(), $e->oauthError );
}
}
/**
* Set the path and request data
*
* @return void
*/
protected function _setPath()
{
/* Decode URL */
if ( \IPS\Settings::i()->use_friendly_urls and \IPS\Settings::i()->htaccess_mod_rewrite and mb_substr( \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_PATH ], -14 ) !== '/api/index.php' )
{
/* We are using Mod Rewrite URL's, so look in the path */
$this->path = mb_substr( \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_PATH ], mb_strpos( \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_PATH ], '/api/' ) + 5 );
/* nginx won't convert the 'fake' query string to $_GET params, so do this now */
if ( ! empty( \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_QUERY ] ) )
{
parse_str( \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_QUERY ], $params );
foreach ( $params as $k => $v )
{
if ( ! isset( \IPS\Request::i()->$k ) )
{
\IPS\Request::i()->$k = $v;
}
}
}
}
else
{
/* Otherwise we are not, so we need the query string instead, which is actually easier */
$this->path = \IPS\Request::i()->url()->data[ \IPS\Http\Url::COMPONENT_QUERY ];
/* However, if we passed any actual query string arguments, we need to strip those */
if( mb_strpos( $this->path, '&' ) )
{
$this->path = mb_substr( $this->path, 0, mb_strpos( $this->path, '&' ) );
}
}
}
/**
* Work out if this is an API Key request, or an OAuth request
*
* @note OAuth requires Access Tokens only be transmitted over TLS, so if the request isn't secure, we ignore OAuth credentials
* @return void
*/
public function _setRawCredentials()
{
if ( $authorizationHeader = \IPS\Request::i()->authorizationHeader() )
{
if ( mb_substr( $authorizationHeader, 0, 7 ) === 'Bearer ' and ( !\IPS\OAUTH_REQUIRES_HTTPS or \IPS\Request::i()->isSecure() ) )
{
$this->rawAccessToken = mb_substr( $authorizationHeader, 7 );
}
else
{
$exploded = explode( ':', base64_decode( mb_substr( $authorizationHeader, 6 ) ) );
if ( isset( $exploded[0] ) )
{
$this->rawApiKey = $exploded[0];
}
}
}
}
/**
* Check the IP Address isn't banned
*
* @return void
* @throws \IPS\Api\Exception
*/
protected function _checkIpAddressIsAllowed()
{
/* Check the IP address is banned */
if ( \IPS\Request::i()->ipAddressIsBanned() )
{
throw new \IPS\Api\Exception( 'IP_ADDRESS_BANNED', '1S290/A', 403 );
}
/* If we have tried to access the API with a bad key more than 10 times, ban the IP address */
if ( \IPS\Db::i()->select( 'COUNT(*)', 'core_api_logs', array( 'ip_address=? AND is_bad_key=1', \IPS\Request::i()->ipAddress() ) )->first() > 10 )
{
/* Remove the flag from these logs so that if the admin unbans the IP we aren't immediately banned again */
\IPS\Db::i()->update( 'core_api_logs', array( 'is_bad_key' => 0 ), array( 'ip_address=?', \IPS\Request::i()->ipAddress() ) );
/* Then insert the ban... */
\IPS\Db::i()->insert( 'core_banfilters', array(
'ban_type' => 'ip',
'ban_content' => \IPS\Request::i()->ipAddress(),
'ban_date' => time(),
'ban_reason' => 'API',
) );
unset( \IPS\Data\Store::i()->bannedIpAddresses );
/* And throw an error */
throw new \IPS\Api\Exception( 'IP_ADDRESS_BANNED', '1S290/C', 403 );
}
/* If we have tried to access the API with a bad key more than once in the last 5 minutes, throw an error to prevent brute-forcing */
if ( \IPS\Db::i()->select( 'COUNT(*)', 'core_api_logs', array( 'ip_address=? AND is_bad_key=1 AND date>?', \IPS\Request::i()->ipAddress(), \IPS\DateTime::create()->sub( new \DateInterval( 'PT5M' ) )->getTimestamp() ) )->first() > 1 )
{
throw new \IPS\Api\Exception( 'TOO_MANY_REQUESTS_WITH_BAD_KEY', '1S290/D', 429 );
}
}
/**
* Set API Key
*
* @return void
*/
public function _setApiKey()
{
try
{
$this->apiKey = \IPS\Api\Key::load( $this->rawApiKey );
if ( $this->apiKey->allowed_ips and !\in_array( \IPS\Request::i()->ipAddress(), explode( ',', $this->apiKey->allowed_ips ) ) )
{
throw new \IPS\Api\Exception( 'IP_ADDRESS_NOT_ALLOWED', '2S290/8', 403 );
}
}
catch ( \OutOfRangeException $e )
{
throw new \IPS\Api\Exception( 'INVALID_API_KEY', '3S290/7', 401 );
}
}
/**
* Set Access Token
*
* @return void
*/
public function _setAccessToken()
{
try
{
$this->accessToken = \IPS\Api\OAuthClient::accessTokenDetails( $this->rawAccessToken );
}
catch ( \UnderflowException $e )
{
throw new \IPS\Api\Exception( 'INVALID_ACCESS_TOKEN', '3S290/9', 401, 'invalid_token' );
}
}
/**
* Set Language
*
* @return void
*/
public function _setLanguage()
{
try
{
if ( isset( $_SERVER['HTTP_X_IPS_LANGUAGE'] ) )
{
$this->language = \IPS\Lang::load( \intval( $_SERVER['HTTP_X_IPS_LANGUAGE'] ) );
}
else
{
$this->language = \IPS\Lang::load( \IPS\Lang::defaultLanguage() );
}
}
catch ( \OutOfRangeException $e )
{
throw new \IPS\Api\Exception( 'INVALID_LANGUAGE', '2S290/9', 400, 'invalid_request' );
}
}
/**
* Run
*
* @return void
*/
public function run()
{
$shouldLog = FALSE;
try
{
/* Work out the app and controller. Both can only be alphanumeric - prevents include injections */
$pathBits = array_filter( explode( '/', $this->path ) );
$app = array_shift( $pathBits );
if ( !preg_match( '/^[a-z0-9]+$/', $app ) )
{
throw new \IPS\Api\Exception( 'INVALID_APP', '3S290/3', 400 );
}
$controller = array_shift( $pathBits );
if ( !preg_match( '/^[a-z0-9]+$/', $controller ) )
{
throw new \IPS\Api\Exception( 'INVALID_CONTROLLER', '3S290/4', 400 );
}
/* Load the app */
try
{
$app = \IPS\Application::load( $app );
}
catch ( \OutOfRangeException $e )
{
throw new \IPS\Api\Exception( 'INVALID_APP', '2S290/1', 404 );
}
/* Check it's enabled */
if ( !$app->enabled )
{
throw new \IPS\Api\Exception( 'APP_DISABLED', '1S290/2', 503 );
}
/* Get the controller */
$class = 'IPS\\' . $app->directory . '\\api\\' . $controller;
if ( !class_exists( $class ) )
{
throw new \IPS\Api\Exception( 'INVALID_CONTROLLER', '2S290/5', 404 );
}
/* Run it */
$controller = new $class( $this->apiKey, $this->accessToken );
$response = $controller->execute( $pathBits, $shouldLog );
/* Store if we need to mask anything in logs */
$this->parametersToMask = ( $controller->methodCalled AND isset( $controller->parametersToMask[ $controller->methodCalled ] ) ) ? $controller->parametersToMask[ $controller->methodCalled ] : NULL;
/* Send Output */
$output = $response->getOutput();
$this->language->parseOutputForDisplay( $output );
$this->_respond( json_encode( $output, JSON_PRETTY_PRINT ), $response->httpCode, NULL, $shouldLog, TRUE );
}
catch ( \IPS\Api\Exception $e )
{
$this->_respond( json_encode( array( 'errorCode' => $e->exceptionCode, 'errorMessage' => $e->getMessage() ), JSON_PRETTY_PRINT ), $e->getCode(), $e->oauthError, $shouldLog );
}
catch ( \Exception $e )
{
\IPS\Log::log( $e, 'api' );
$this->_respond( json_encode( array( 'errorCode' => 'EX' . $e->getCode(), 'errorMessage' => \IPS\IN_DEV ? $e->getMessage() : 'UNKNOWN_ERROR' ), JSON_PRETTY_PRINT ), 500 );
}
}
/**
* @brief Parameters to mask in logs per the controller
*/
protected $parametersToMask = NULL;
/**
* Log
*
* @param array $response Response to output
* @param int $httpResponseCode HTTP Response Code
* @param bool $isBadKey Was the ley invalid?
* @return void
*/
protected function _log( $response, $httpResponseCode, $isBadKey=FALSE )
{
try
{
$_requestData = $_REQUEST;
if( $this->parametersToMask AND \count( $this->parametersToMask ) )
{
foreach( $_requestData as $k => $v )
{
if( \in_array( $k, $this->parametersToMask ) )
{
$_requestData[ $k ] = '******';
}
}
}
\IPS\Db::i()->insert( 'core_api_logs', array(
'endpoint' => $this->path,
'method' => $_SERVER['REQUEST_METHOD'],
'api_key' => $this->rawApiKey,
'ip_address' => \IPS\Request::i()->ipAddress(),
'request_data' => json_encode( $_requestData, JSON_PRETTY_PRINT ),
'response_code' => $httpResponseCode,
'response_output' => $response,
'date' => time(),
'is_bad_key' => $isBadKey,
'client_id' => $this->accessToken ? $this->accessToken['client_id'] : NULL,
'member_id' => $this->accessToken ? $this->accessToken['member_id'] : NULL,
'access_token' => $this->rawAccessToken,
) );
}
catch ( \IPS\Db\Exception $e ) {}
}
/**
* Output response
*
* @param string $response Response to output
* @param int $httpResponseCode HTTP Response Code
* @param NULL|string $oauthError OAuth error
* @param bool $log Whether or not to log the response
* @return void
*/
protected function _respond( $response, $httpResponseCode, $oauthError=NULL, $log=FALSE )
{
$headers = $this->canBeCached() ? \IPS\Output::getCacheHeaders( time(), 60 ) : \IPS\Output::getNoCacheHeaders();
if ( $this->rawAccessToken and $oauthError )
{
$headers['WWW-Authenticate'] = "Bearer error=\"{$oauthError}\"";
}
if ( $log )
{
$this->_log( $response, $httpResponseCode );
}
\IPS\Output::i()->sendOutput( $response, $httpResponseCode, 'application/json', $headers );
}
/**
* Can this response be cached?
*
* @return bool
*/
protected function canBeCached() : bool
{
return $this->cacheResponse AND mb_strtolower( $_SERVER['REQUEST_METHOD'] ) == 'get' AND !$this->rawAccessToken;
}
/**
* Destructor
*
* @return void
*/
public function __destruct()
{
}
}