upload.php

<?php

/**
 * @file
 * Upload handler for media files.
 *
 * Copyright 2013, Moxiecode Systems AB
 * Released under GPL License.
 *
 * License: http://www.plupload.com/license
 * Contributing: http://www.plupload.com/contributing
 */

// Only output real errors. We don't want warnings to break the JSON.
error_reporting(E_ERROR);

// HTTP headers for no cache & CORS etc.
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE, OPTIONS');
header('Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token');
header('Content-type: text/html;');
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", FALSE);
header("Pragma: no-cache");

// 5 minutes execution time.
@set_time_limit(5 * 60);

require_once 'helper_base.php';
// Settings.
if (isset($_GET['destination'])) {
  // The upload path should be provided by the client as is configurable.
  $targetDir = "$_GET[destination]";
}
else {
  throw new Exception('Bad request to upload.php script');
}
// Clenaup old .part upload files.
$cleanupTargetDir = TRUE;
// Max .part file age in seconds.
$maxFileAge = 5 * 3600;

// Create target dir.
if (!file_exists($targetDir)) {
  @mkdir($targetDir);
}
if (!file_exists($targetDir)) {
  die('{"jsonrpc" : "2.0", "error" : {"code": 105, "message": "Failed to create upload directory."}, "id" : "id"}');
}

// Get a file name.
if (isset($_REQUEST["name"])) {
  $fileName = $_REQUEST["name"];
}
elseif (!empty($_FILES)) {
  $fileName = $_FILES["file"]["name"];
}
else {
  die('{"jsonrpc" : "2.0", "error" : {"code": 106, "message": "File has no name."}, "id" : "id"}');
}
// Clean the fileName for security reasons.
$fileName = preg_replace('/[^\w\._]+/', '', $fileName);

if (!helper_base::checkUploadFileType($fileName)) {
  die('{"jsonrpc" : "2.0", "error" : {"code": 108, "message": "File type not allowed."}, "id" : "id"}');
}

// Chunking might be enabled.
$chunk = isset($_REQUEST["chunk"]) ? intval($_REQUEST["chunk"]) : 0;
$chunks = isset($_REQUEST["chunks"]) ? intval($_REQUEST["chunks"]) : 0;

$filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;

// Remove old temp files.
if ($cleanupTargetDir) {
  if (!is_dir($targetDir) || !$dir = opendir($targetDir)) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 100, "message": "Failed to open temp directory."}, "id" : "id"}');
  }

  while (($file = readdir($dir)) !== FALSE) {
    $tmpfilePath = $targetDir . DIRECTORY_SEPARATOR . $file;

    // If .part file is current file proceed to the next.
    if ($tmpfilePath == "{$filePath}.part") {
      continue;
    }

    // Remove .part file if it is older than the max age.
    if (preg_match('/\.part$/', $file) && (filemtime($tmpfilePath) < time() - $maxFileAge)) {
      @unlink($tmpfilePath);
    }
  }
  closedir($dir);
}

// Open .part file for output.
if (!$out = @fopen("{$filePath}.part", $chunks ? "ab" : "wb")) {
  die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
}

if (!empty($_FILES)) {
  if ($_FILES["file"]["error"] || !is_uploaded_file($_FILES["file"]["tmp_name"])) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}');
  }

  // Read binary input stream and append it to .psrt file.
  if (!$in = @fopen($_FILES["file"]["tmp_name"], "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
  }
}
else {
  if (!$in = @fopen("php://input", "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
  }
}

while ($buff = fread($in, 4096)) {
  fwrite($out, $buff);
}

@fclose($out);
@fclose($in);

// Test file size after each chunk in case hacker has
// circumvented client-side check to send something huge.
clearstatcache();
$file['size'] = filesize("{$filePath}.part");
$file['error'] = '';
if (!helper_base::checkUploadSize($file)) {
  // An upload size fail probably means the limit in moxie.js for not resizing
  // huge images has been hit.
  unlink("{$filePath}.part");
  die('{"jsonrpc" : "2.0", "error" : {"code": 104, "message": "Uploaded file too big. Please resize the file and try again."}, "id" : "id"}');
}

// Check if file has been uploaded.
if (!$chunks || $chunk == $chunks - 1) {
  if (!helper_base::checkUploadMimeType("{$filePath}.part")) {
    // If the file is not a valid image, then delete it.
    unlink("{$filePath}.part");
    die('{"jsonrpc" : "2.0", "error" : {"code": 107, "message": "File Mime type not allowed."}, "id" : "id"}');
  }

  // File appears to be valid.
  // Strip the temp .part suffix off.
  rename("{$filePath}.part", $filePath);
}

// Return JSON-RPC success response.
echo '{"jsonrpc" : "2.0", "result" : null, "id" : "id"}';