classes to help with UploadedFileXhr

uploaded_file.php

<?php

/**
 * Handle file uploads via XMLHttpRequest
 */
class UploadedFileXhr {
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);

        if ($realSize != $this->getSize()){
            return false;
        }
        $target = fopen($path, "w");
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);

        return true;
    }
    function getName() {
        return $_GET['qqfile'];
    }
    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"])){
            return (int)$_SERVER["CONTENT_LENGTH"];
        } else {
            throw new Exception('Getting content length is not supported.');
        }
    }
}

/**
 * Handle file uploads via regular form post (uses the $_FILES array)
 */
class UploadedFileForm {
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {
        if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){
            return false;
        }
        return true;
    }
    function getName() {
        return $_FILES['qqfile']['name'];
    }
    function getSize() {
        return $_FILES['qqfile']['size'];
    }
}

class UploadedFile {
    private $allowedExtensions = array();
    private $sizeLimit = 10485760;
    private $file;
    function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){
        $allowedExtensions = array_map("strtolower", $allowedExtensions);

        $this->allowedExtensions = $allowedExtensions;
        $this->sizeLimit = $sizeLimit;

        $this->checkServerSettings();

        if (isset($_GET['qqfile'])) {
            $this->file = new UploadedFileXhr();
        } elseif (isset($_FILES['qqfile'])) {
            $this->file = new UploadedFileForm();
        } else {
            $this->file = false;
        }
    }
    private function checkServerSettings(){
        $postSize = $this->toBytes(ini_get('post_max_size'));
        $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));
        if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
            $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';
            die("{'error':'increase post_max_size and upload_max_filesize to $size'}");
        }
    }
    private function toBytes($str){
        $val = trim($str);
        $last = strtolower($str[strlen($str)-1]);
        switch($last) {
            case 'g': $val *= 1024;
            case 'm': $val *= 1024;
            case 'k': $val *= 1024;
        }
        return $val;
    }

    /**
     * Returns array('success'=>true) or array('error'=>'error message')
     */
    function handleUpload($uploadDirectory, $replaceOldFile = true){
        if (!is_writable($uploadDirectory)){
            return array('error' => "Server error. Upload directory isn't writable.");
        }
        if (!$this->file){
            return array('error' => 'No files were uploaded.');
        }
        $size = $this->file->getSize();
        if ($size == 0) {
            return array('error' => 'File is empty');
        }
        if ($size > $this->sizeLimit) {
            return array('error' => 'File is too large');
        }
        $pathinfo = pathinfo($this->file->getName());
        $filename = $pathinfo['filename'];
        $filename = preg_replace('#[^0-9a-zA-Z\.\-]#', '', ucwords(strtolower($filename)));
        //$filename = md5(uniqid());
        $ext = $pathinfo['extension'];

        if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
            $these = implode(', ', $this->allowedExtensions);
            return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
        }
        if(!$replaceOldFile){
            /// don't overwrite previous files that were uploaded
            while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                $filename .= rand(10, 99);
            }
        }
        if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
            return array('success' => true, 'size' => $size, 'filename' => $filename, 'ext' => $ext);
        } else {
            return array('error'=> 'Could not save uploaded file.' .
                'The upload was cancelled, or server error encountered');
        }
    }
}



/*

# example cakephp2+ usage:

if ($this->request->is('ajax')) {
	// UploadedFile = UploadedFileXhr
	App::uses('UploadedFile', 'Lib');
	$allowedExtensions = array('jpeg', 'jpg', 'gif', 'png', 'bmp');
	$sizeLimit = 20 * 1024 * 1024; // max file size in bytes
	$uploader = new UploadedFile($allowedExtensions, $sizeLimit);
	$result = $uploader->handleUpload(TMP);
	if ($result['success']) {
		$this->request->data['Design']['image'] = array(
			'name' => $result['filename'].'.'.$result['ext'],
			'type' => 'image/jpeg',
			'tmp_name' => TMP.$result['filename'].'.'.$result['ext'],
			'error' => 0,
			'size' => $result['size']
		);
	} elseif ($this->RequestHandler->responseType() == 'json') {
		return new CakeResponse(array('body' => json_encode($result)));
	}
}

*/