Amazone S3 file upload class

amazone_3s_file_upload_class.php

<?php

namespace Somewhere\Model;

class Upload {

    public function __construct() {}

    public function addFile($post_name, $directory = '/usr/share/nginx/files/') {
        global $s3, $Log; //S3 library and Monolog
        $FileErrorIndex = $_FILES[$post_name]["error"];

        $allowedExts = array("gif", "jpeg", "jpg", "png",'pdf','csv');
        $temp = explode(".", $_FILES[$post_name]["name"]);
        $extension = end($temp);

        $mime = "";

        switch($extension){
            case 'gif': $mime = 'image/' . $extension; break;
            case 'jpeg': $mime = 'image/' . $extension; break;
            case 'jpg': $mime = 'image/' . $extension; break;
            case 'png': $mime = 'image/' . $extension; break;
            case 'csv': $mime = 'text/csv'; break;
            case 'pdf': $mime = 'application/pdf'; break;
        }
        
        $filename = "";

        if (!in_array($extension, $allowedExts)) {
            throw new \Exception('Invalid mime type', 504);
        }

        if ($FileErrorIndex == UPLOAD_ERR_OK) {
            $filename = str_replace('/','_',$mime).'_' . sha1(date('YmdHis')) . '.' . $extension;
            try {
                // Upload data.
                $result = $s3->putObject(array(
                    'Bucket' => 'somebucketname',
                    'Key'    => $filename,
                    'SourceFile'   => $_FILES[$post_name]["tmp_name"],
                    'ACL'    => 'public-read',
                    'ContentType' => $mime,
                    'ServerSideEncryption' => 'AES256'
                ));
                return $filename;
            } catch (S3Exception $e) {
                $Log->addCritical('upload_s3_failed', ['Message' => $e->getMessage(), 'File' => $e->getFile(), 'Code' => $e->getCode(), 'Line' => $e->getLine()]);
            }

        }
        else {
            switch ($FileErrorIndex) {
                case UPLOAD_ERR_INI_SIZE:
                    $message = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
                    break;
                case UPLOAD_ERR_FORM_SIZE:
                    $message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";
                    break;
                case UPLOAD_ERR_PARTIAL:
                    $message = "The uploaded file was only partially uploaded";
                    break;
                case UPLOAD_ERR_NO_FILE:
                    $message = "No file was uploaded";
                    break;
                case UPLOAD_ERR_NO_TMP_DIR:
                    $message = "Missing a temporary folder";
                    break;
                case UPLOAD_ERR_CANT_WRITE:
                    $message = "Failed to write file to disk";
                    break;
                case UPLOAD_ERR_EXTENSION:
                    $message = "File upload stopped by extension";
                    break;

                default:
                    $message = "Unknown upload error";
                    break;
            }
            throw new \Exception($message, 503);
        }
    }

}