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<?php

/*
* Mashape PHP library.
*
* Copyright (C) 2011 Mashape, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* The author of this software is Mashape, Inc.
* For any question or feedback please contact us at: support@mashape.com
*
*/

require_once(dirname(__FILE__) . "/../init/init.php");
require_once(dirname(__FILE__) . "/../json/jsonUtils.php");
require_once(dirname(__FILE__) . "/../net/httpUtils.php");
require_once(dirname(__FILE__) . "/discover/discover.php");
require_once(dirname(__FILE__) . "/call/call.php");

define("OPERATION", "_op");
define("CALLBACK", "callback");

class MashapeHandler {

private static function setUnauthorizedResponse() {
header("HTTP/1.0 401 Unauthorized");
header('WWW-Authenticate: Mashape realm="Mashape API authentication"');
}

private static function getAllParams($source) {
$keys = array_keys($source);
$result = array();
foreach ($keys as $key) {
$result[$key] = $source[$key];
}
return $result;
}

private static function validateCallback($callback) {
if (preg_match("/^(\w\.?_?)+$/", $callback)) {
return true;
} else {
return false;
}
}

public static function handleAPI($instance, $serverKey) {
header("Content-type: application/json");
try {
if ($instance == null) {
throw new MashapeException(EXCEPTION_INSTANCE_NULL, EXCEPTION_SYSTEM_ERROR_CODE);
}
$requestMethod = (isset($_SERVER['REQUEST_METHOD'])) ? strtolower($_SERVER['REQUEST_METHOD']) : null;
$params;
if ($requestMethod == 'post') {
$params = self::getAllParams($_POST);
} else if ($requestMethod == 'get') {
$params = self::getAllParams($_GET);
} else if ($requestMethod == 'put' || $requestMethod == 'delete') {
$params = HttpUtils::parseQueryString(file_get_contents("php://input"));
} else {
throw new MashapeException(EXCEPTION_NOTSUPPORTED_HTTPMETHOD, EXCEPTION_NOTSUPPORTED_HTTPMETHOD_CODE);
}

$operation = (isset($params[OPERATION])) ? $params[OPERATION] : null;
unset($params[OPERATION]); // remove the operation parameter

if (empty($operation)) {
$operation = "call";
}
if ($operation != null) {
$result;
switch (strtolower($operation)) {
case "discover":
header("Content-type: application/xml");
$discover = new Discover();
$result = $discover->handle($instance, $serverKey, $params, $requestMethod);
break;
case "call":
$call = new Call();
$result = $call->handle($instance, $serverKey, $params, $requestMethod);
break;
default:
throw new MashapeException(EXCEPTION_NOTSUPPORTED_OPERATION, EXCEPTION_NOTSUPPORTED_OPERATION_CODE);
}

$jsonpCallback = (isset($params[CALLBACK])) ? $params[CALLBACK] : null;
if (empty($jsonpCallback)) {
// Print the output
echo $result;
} else {
if (self::validateCallback($jsonpCallback)) {
echo $jsonpCallback . '(' . $result . ')';
} else {
throw new MashapeException(EXCEPTION_INVALID_CALLBACK, EXCEPTION_SYSTEM_ERROR_CODE);
}
}

} else {
// Operation not supported
throw new MashapeException(EXCEPTION_NOTSUPPORTED_OPERATION, EXCEPTION_NOTSUPPORTED_OPERATION_CODE);
}

} catch (Exception $e) {
//If it's an ApizatorException then print the specific code
if ($e instanceof MashapeException) {
header("Content-type: application/json");
$code = $e->getCode();
switch ($code) {
case EXCEPTION_XML_CODE:
header("HTTP/1.0 500 Internal Server Error");
break;
case EXCEPTION_INVALID_HTTPMETHOD_CODE:
header("HTTP/1.0 405 Method Not Allowed");
break;
case EXCEPTION_NOTSUPPORTED_HTTPMETHOD_CODE:
header("HTTP/1.0 405 Method Not Allowed");
break;
case EXCEPTION_NOTSUPPORTED_OPERATION_CODE:
header("HTTP/1.0 501 Not Implemented");
break;
case EXCEPTION_METHOD_NOTFOUND_CODE:
header("HTTP/1.0 200 OK");
break;
case EXCEPTION_AUTH_INVALID_CODE:
self::setUnauthorizedResponse();
break;
case EXCEPTION_AUTH_INVALID_SERVERKEY_CODE:
self::setUnauthorizedResponse();
break;
case EXCEPTION_REQUIRED_PARAMETERS_CODE:
header("HTTP/1.0 200 OK");
break;
case EXCEPTION_GENERIC_LIBRARY_ERROR_CODE:
header("HTTP/1.0 500 Internal Server Error");
break;
case EXCEPTION_INVALID_APIKEY_CODE:
self::setUnauthorizedResponse();
break;
case EXCEPTION_EXCEEDED_LIMIT_CODE:
self::setUnauthorizedResponse();
break;
case EXCEPTION_SYSTEM_ERROR_CODE:
header("HTTP/1.0 500 Internal Server Error");
break;
}
echo JsonUtils::serializeError($e->getMessage(), $code);
} else {
//Otherwise print a "generic exception" code
header("HTTP/1.0 500 Internal Server Error");
echo JsonUtils::serializeError($e->getMessage(), EXCEPTION_GENERIC_LIBRARY_ERROR_CODE);
}
}
}
}
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