php-swfuploader-notify/upload.php

<?php
/*		This is an upload script for SWFUpload that attempts to properly handle uploaded files
		in a secure way.																		*/

// Mail Settings. Easy, eh?
$to = 'name@domain.com';
$subject = 'File Uploaded to Web Site Name';
$from = 'From: User Name <cheese@cheese.com>';

// Allowed file extensions
$extension_whitelist = array("jpg", "gif", "png", "zip", "pdf", "psd");	


// ***** You shouldn't have to edit anything Below this line *****










// Code for Session Cookie workaround
	if (isset($_POST["PHPSESSID"])) {
		session_id($_POST["PHPSESSID"]);
	} else if (isset($_GET["PHPSESSID"])) {
		session_id($_GET["PHPSESSID"]);
	}

	session_start();

// Check post_max_size (http://us3.php.net/manual/en/features.file-upload.php#73762)
	$POST_MAX_SIZE = ini_get('post_max_size');
	$unit = strtoupper(substr($POST_MAX_SIZE, -1));
	$multiplier = ($unit == 'M' ? 1048576 : ($unit == 'K' ? 1024 : ($unit == 'G' ? 1073741824 : 1)));

	if ((int)$_SERVER['CONTENT_LENGTH'] > $multiplier*(int)$POST_MAX_SIZE && $POST_MAX_SIZE) {
		header("HTTP/1.1 500 Internal Server Error");
		echo "POST exceeded maximum allowed size.";
		exit(0);
	}

// Settings
	$save_path = getcwd() . "/uploads/";				// The path were we will save the file (getcwd() may not be reliable and should be tested in your environment)
	$upload_name = "Filedata";
	$max_file_size_in_bytes = 2147483647;				// 2GB in bytes
	
	$valid_chars_regex = '.A-Z0-9_ !@#$%^&()+={}\[\]\',~`-';	// Characters allowed in the file name (in a Regular Expression format)
	
// Other variables	
	$MAX_FILENAME_LENGTH = 260;
	$file_name = "";
	$file_extension = "";
	$uploadErrors = array(
        0=>"There is no error, the file uploaded with success",
        1=>"The uploaded file exceeds the upload_max_filesize directive in php.ini",
        2=>"The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form",
        3=>"The uploaded file was only partially uploaded",
        4=>"No file was uploaded",
        6=>"Missing a temporary folder"
	);


// Validate the upload
	if (!isset($_FILES[$upload_name])) {
		HandleError("No upload found in \$_FILES for " . $upload_name);
		exit(0);
	} else if (isset($_FILES[$upload_name]["error"]) && $_FILES[$upload_name]["error"] != 0) {
		HandleError($uploadErrors[$_FILES[$upload_name]["error"]]);
		exit(0);
	} else if (!isset($_FILES[$upload_name]["tmp_name"]) || !@is_uploaded_file($_FILES[$upload_name]["tmp_name"])) {
		HandleError("Upload failed is_uploaded_file test.");
		exit(0);
	} else if (!isset($_FILES[$upload_name]['name'])) {
		HandleError("File has no name.");
		exit(0);
	}
	
// Validate the file size (Warning: the largest files supported by this code is 2GB)
	$file_size = @filesize($_FILES[$upload_name]["tmp_name"]);
	if (!$file_size || $file_size > $max_file_size_in_bytes) {
		HandleError("File exceeds the maximum allowed size");
		exit(0);
	}
	
	if ($file_size <= 0) {
		HandleError("File size outside allowed lower bound");
		exit(0);
	}


// Validate file name (for our purposes we'll just remove invalid characters)
	$file_name = preg_replace('/[^'.$valid_chars_regex.']|\.+$/i', "", basename($_FILES[$upload_name]['name']));
	if (strlen($file_name) == 0 || strlen($file_name) > $MAX_FILENAME_LENGTH) {
		HandleError("Invalid file name");
		exit(0);
	}


// Validate that we won't over-write an existing file
	if (file_exists($save_path . $file_name)) {
		HandleError("File with this name already exists");
		exit(0);
	}

// Validate file extension
	$path_info = pathinfo($_FILES[$upload_name]['name']);
	$file_extension = $path_info["extension"];
	$is_valid_extension = false;
	foreach ($extension_whitelist as $extension) {
		if ($file_extension == $extension) {
			$is_valid_extension = true;
			break;
		}
	}
	if (!$is_valid_extension) {
		HandleError("Invalid file extension");
		exit(0);
	}

// Validate file contents (extension and mime-type can't be trusted)
	/*
		Validating the file contents is OS and web server configuration dependant.  Also, it may not be reliable.
		See the comments on this page: http://us2.php.net/fileinfo
		
		Also see http://72.14.253.104/search?q=cache:3YGZfcnKDrYJ:www.scanit.be/uploads/php-file-upload.pdf+php+file+command&hl=en&ct=clnk&cd=8&gl=us&client=firefox-a
		 which describes how a PHP script can be embedded within a GIF image file.
		
		Therefore, no sample code will be provided here.  Research the issue, decide how much security is
		 needed, and implement a solution that meets the needs.
	*/


// Process the file
	/*
		At this point we are ready to process the valid file. This sample code shows how to save the file. Other tasks
		 could be done such as creating an entry in a database or generating a thumbnail.
		 
		Depending on your server OS and needs you may need to set the Security Permissions on the file after it has
		been saved.
	*/
	if (!@move_uploaded_file($_FILES[$upload_name]["tmp_name"], $save_path.$file_name)) {
		HandleError("File could not be saved.");
		exit(0);
	}

// Email it up!
	$pageURL = 'http';
	 if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
	 $pageURL .= "://";
	 if ($_SERVER["SERVER_PORT"] != "80") {
	  $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
	 } else {
	  $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
	 }
	 $url = str_replace('upload.php', 'uploads/', $pageURL);

	
	$body = "A file has been uploaded. \n \n Here's a link: \n \n  $url".rawurlencode($file_name);
	// .$url
	
	mail($to, $subject, $body, $from);
	
	
	// Return output to the browser (only supported by SWFUpload for Flash Player 9)
	
	echo "File Received";	
	
	exit(0);


/* Handles the error output.  This function was written for SWFUpload for Flash Player 8 which
cannot return data to the server, so it just returns a 500 error. For Flash Player 9 you will
want to change this to return the server data you want to indicate an error and then use SWFUpload's
uploadSuccess to check the server_data for your error indicator. */
function HandleError($message) {
	header("HTTP/1.1 500 Internal Server Error");
	echo $message;
}
?>