FileAPI.class.php

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<?php
    class FileAPI {
        const OK = 200;
        const ERROR = 500;
 
 
        private static function rRestructuringFilesArray(&$arrayForFill, $currentKey, $currentMixedValue, $fileDescriptionParam){
            if( is_array($currentMixedValue) ){
                foreach( $currentMixedValue as $nameKey => $mixedValue ){
                    self::rRestructuringFilesArray($arrayForFill[$currentKey],
                                             $nameKey,
                                             $mixedValue,
                                             $fileDescriptionParam);
                }
            } else {
                $arrayForFill[$currentKey][$fileDescriptionParam] = $currentMixedValue;
            }
        }
 
 
        private static function determineMimeType(&$file){
            if( function_exists('mime_content_type') ){
                if( isset($file['tmp_name']) && is_string($file['tmp_name']) ){
                    if( $file['type'] == 'application/octet-stream' ){
                        $mime = mime_content_type($file['tmp_name']);
                        if( !empty($mime) ){
                            $file['type'] = $mime;
                        }
                    }
                }
                else if( is_array($file) ){
                    foreach( $file as &$entry ){
                        self::determineMimeType($entry);
                    }
                }
            }
        }
 
 
        public static function enableCORS($options = null){
            if( is_null($options) ){
                $options = array();
            }
 
            if( !isset($options['origin']) ){
                $options['origin'] = $_SERVER['HTTP_ORIGIN'];
            }
 
            if( !isset($options['methods']) ){
                $options['methods'] = 'POST, GET';
            }
 
            if( !isset($options['headers']) ){
                $options['headers'] = array();
            }
 
            header('Access-Control-Allow-Origin: ' . $options['origin']);
            header('Access-Control-Allow-Methods: ' . $options['methods']);
            header('Access-Control-Allow-Headers: ' . implode(', ', array_merge($options['headers'], array('X-Requested-With', 'Content-Range', 'Content-Disposition'))));
 
            if( !isset($options['cookie']) || $options['cookie'] ){
                header('Access-Control-Allow-Credentials: true');
            }
        }
 
 
        public static function getRequestHeaders(){
            $headers = array();
 
            foreach( $_SERVER as $key => $value ){
                if( substr($key, 0, 5) == 'HTTP_' ){
                    $header = str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))));
                    $headers[$header] = $value;
                }
            }
 
            return $headers;
        }
 
 
        public static function getFiles(){
            $files = array();
 
            // http://www.php.net/manual/ru/reserved.variables.files.php#106558
            foreach( $_FILES as $firstNameKey => $arFileDescriptions ){
                foreach( $arFileDescriptions as $fileDescriptionParam => $mixedValue ){
                    self::rRestructuringFilesArray($files, $firstNameKey, $_FILES[$firstNameKey][$fileDescriptionParam], $fileDescriptionParam);
                }
            }
 
            self::determineMimeType($files);
 
            return  $files;
        }
 
 
        public static function makeResponse(array $res, $jsonp = null){
            $body = $res['body'];
            $json = is_array($body) ? json_encode($body) : $body;
 
            $httpStatus = isset($res['status']) ? $res['status'] : self::OK;
            $httpStatusText  = addslashes(isset($res['statusText']) ? $res['statusText'] : 'OK');
            $httpHeaders = isset($res['headers']) ? $res['headers'] : array();
 
            if( empty($jsonp) ){
                header("HTTP/1.1 $httpStatus $httpStatusText");
                $httpHeaders['Content-Type'] = 'application/json';
                foreach( $httpHeaders as $header => $value ){
                    header("$header: $value");
                }
                echo $json;
            }
            else {
                $json = addslashes($json);
 
                echo  <<<END
                    <script>
                    (function (ctx, jsonp){
                        'use strict';
                        var status = $httpStatus, statusText = "$httpStatusText", response = "$json";
                        try {
                            ctx[jsonp](status, statusText, response);
                        } catch (e){
                            var data = "{\"id\":\"$jsonp\",\"status\":"+status+",\"statusText\":\""+statusText+"\",\"response\":\""+response.replace(/\"/g, '\\\\\"')+"\"}";
                            try {
                                ctx.postMessage(data, document.referrer);
                            } catch (e){}
                        }
                    })(window.parent, '$jsonp');
                    </script>
END;
            }
        }
 
    }