我需要一个远程上传脚本的帮助，该脚本有一个名为“uploadHandler.php”的页面。我需要使用 jQuery PHP 文件上传（jQuery 文件上传）创建一个远程上传脚本。我想通过这个脚本上传一个来自不同服务器的文件，只输入 URL。如何才能做到这一点？
让我解释。我有一个表单，当用户从他的计算机上传文件时，它会向 uploadHandler.php 发送请求。问题是类型是“multipart/form-data”，所以我无法通过 URL 上传。我尝试输入 URL 但系统返回
[{"name":"","size":0,"type":null,"error":"File received has zero size."}]
那么，我应该怎么做才能确保文件被uploadHandler.php处理然后正确存储呢？我曾想过从服务器下载文件然后上传它来做这样处理。但是怎么做？我附上了uploadHandler.php 的内容，供想阅读的人阅读。预先感谢您的帮助，对于语法和词汇错误，我深表歉意：我不是英语。
class uploadHandler
{
private $options;
function __construct($options = null)
{
// get accepted file types
$acceptedFileTypes = getAcceptedFileTypes();
$this->options = array(
'script_url' => $_SERVER['PHP_SELF'],
'upload_dir' => _CONFIG_FILE_STORAGE_PATH,
'upload_url' => dirname($_SERVER['PHP_SELF']) . '/files/',
'param_name' => 'files',
'delete_hash' => '',
// The php.ini settings upload_max_filesize and post_max_size
// take precedence over the following max_file_size setting:
'max_file_size' => $this->get_max_upload_size(),
'min_file_size' => 1,
'accept_file_types' => COUNT($acceptedFileTypes) ? ('/(\.|\/)(' . str_replace(".", "", implode("|", $acceptedFileTypes)) . ')$/i') : '/.+$/i',
'max_number_of_files' => null,
'discard_aborted_uploads' => true,
'image_versions' => array(
'thumbnail' => array(
'upload_dir' => dirname(__FILE__) . '/thumbnails/',
'upload_url' => dirname($_SERVER['PHP_SELF']) . '/thumbnails/',
'max_width' => 80,
'max_height' => 80
)
)
);
if ($options)
{
$this->options = array_replace_recursive($this->options, $options);
}
}
private function get_max_upload_size()
{
// Initialize current user
$Auth = Auth::getAuth();
// max allowed upload size
$maxUploadSize = SITE_CONFIG_FREE_USER_MAX_UPLOAD_FILESIZE;
if ($Auth->loggedIn())
{
// check if user is a premium/paid user
if ($Auth->level != 'free user')
{
$maxUploadSize = SITE_CONFIG_PREMIUM_USER_MAX_UPLOAD_FILESIZE;
}
}
// if php restrictions are lower than permitted, override
$phpMaxSize = getPHPMaxUpload();
if ($phpMaxSize < $maxUploadSize)
{
$maxUploadSize = $phpMaxSize;
}
return $maxUploadSize;
}
private function get_file_object($file_name)
{
$file_path = $this->options['upload_dir'] . $file_name;
if (is_file($file_path) && $file_name[0] !== '.')
{
$file = new stdClass();
$file->name = $file_name;
$file->size = filesize($file_path);
$file->url = $this->options['upload_url'] . rawurlencode($file->name);
foreach ($this->options['image_versions'] as $version => $options)
{
if (is_file($options['upload_dir'] . $file_name))
{
$file->{$version . '_url'} = $options['upload_url']
. rawurlencode($file->name);
}
}
$file->delete_url = '~d?' . $this->options['delete_hash'];
$file->info_url = '~i?' . $this->options['delete_hash'];
$file->delete_type = 'DELETE';
return $file;
}
return null;
}
private function get_file_objects()
{
return array_values(array_filter(array_map(
array($this, 'get_file_object'), scandir($this->options['upload_dir'])
)));
}
private function create_scaled_image($file_name, $options)
{
$file_path = $this->options['upload_dir'] . $file_name;
$new_file_path = $options['upload_dir'] . $file_name;
list($img_width, $img_height) = @getimagesize($file_path);
if (!$img_width || !$img_height)
{
return false;
}
$scale = min(
$options['max_width'] / $img_width, $options['max_height'] / $img_height
);
if ($scale > 1)
{
$scale = 1;
}
$new_width = $img_width * $scale;
$new_height = $img_height * $scale;
$new_img = @imagecreatetruecolor($new_width, $new_height);
switch (strtolower(substr(strrchr($file_name, '.'), 1)))
{
case 'jpg':
case 'jpeg':
$src_img = @imagecreatefromjpeg($file_path);
$write_image = 'imagejpeg';
break;
case 'gif':
$src_img = @imagecreatefromgif($file_path);
$write_image = 'imagegif';
break;
case 'png':
$src_img = @imagecreatefrompng($file_path);
$write_image = 'imagepng';
break;
default:
$src_img = $image_method = null;
}
$success = $src_img && @imagecopyresampled(
$new_img, $src_img, 0, 0, 0, 0, $new_width, $new_height, $img_width, $img_height
) && $write_image($new_img, $new_file_path);
// Free up memory (imagedestroy does not delete files):
@imagedestroy($src_img);
@imagedestroy($new_img);
return $success;
}
private function has_error($uploaded_file, $file, $error)
{
if ($error)
{
return $error;
}
if (!preg_match($this->options['accept_file_types'], $file->name))
{
return 'acceptFileTypes';
}
if ($uploaded_file && is_uploaded_file($uploaded_file))
{
$file_size = filesize($uploaded_file);
} else
{
$file_size = $_SERVER['CONTENT_LENGTH'];
}
if ($this->options['max_file_size'] && (
$file_size > $this->options['max_file_size'] ||
$file->size > $this->options['max_file_size'])
)
{
return 'maxFileSize';
}
if ($this->options['min_file_size'] &&
$file_size < $this->options['min_file_size'])
{
return 'minFileSize';
}
if (is_int($this->options['max_number_of_files']) && (
count($this->get_file_objects()) >= $this->options['max_number_of_files'])
)
{
return 'maxNumberOfFiles';
}
return $error;
}
private function handle_file_upload($uploaded_file, $name, $size, $type, $error)
{
$fileUpload = new stdClass();
$fileUpload->name = basename(stripslashes($name));
$fileUpload->size = intval($size);
$fileUpload->type = $type;
$fileUpload->error = null;
$extension = end(explode(".", $fileUpload->name));
$fileUpload->error = $this->has_error($uploaded_file, $fileUpload, $error);
if (!$fileUpload->error)
{
if (strlen(trim($fileUpload->name)) == 0)
{
$fileUpload->error = 'Filename not found.';
}
}
elseif (intval($size) == 0)
{
$fileUpload->error = 'File received has zero size.';
}
elseif (intval($size) > $this->options['max_file_size'])
{
$fileUpload->error = 'File received is larger than permitted.';
}
if (!$fileUpload->error && $fileUpload->name)
{
if ($fileUpload->name[0] === '.')
{
$fileUpload->name = substr($fileUpload->name, 1);
}
$newFilename = MD5(microtime());
// figure out upload type
$file_size = 0;
// select server from pool
$uploadServerId = getAvailableServerId();
$db = Database::getDatabase(true);
$uploadServerDetails = $db->getRow('SELECT * FROM file_server WHERE id = ' . $db->quote($uploadServerId));
// override storage path
if(strlen($uploadServerDetails['storagePath']))
{
$this->options['upload_dir'] = $uploadServerDetails['storagePath'];
if (substr($this->options['upload_dir'], strlen($this->options['upload_dir']) - 1, 1) == '/')
{
$this->options['upload_dir'] = substr($this->options['upload_dir'], 0, strlen($this->options['upload_dir']) - 1);
}
$this->options['upload_dir'] .= '/';
}
// move remotely via ftp
if($uploadServerDetails['serverType'] == 'remote')
{
// connect ftp
$conn_id = ftp_connect($uploadServerDetails['ipAddress'], $uploadServerDetails['ftpPort'], 30);
if($conn_id === false)
{
$fileUpload->error = 'Could not connect to file server '.$uploadServerDetails['ipAddress'];
}
// authenticate
if(!$fileUpload->error)
{
$login_result = ftp_login($conn_id, $uploadServerDetails['ftpUsername'], $uploadServerDetails['ftpPassword']);
if($login_result === false)
{
$fileUpload->error = 'Could not authenticate with file server '.$uploadServerDetails['ipAddress'];
}
}
// create the upload folder
if(!$fileUpload->error)
{
$uploadPathDir = $this->options['upload_dir'] . substr($newFilename, 0, 2);
if(!ftp_mkdir($conn_id, $uploadPathDir))
{
// Error reporting removed for now as it causes issues with existing folders. Need to add a check in before here
// to see if the folder exists, then create if not.
// $fileUpload->error = 'There was a problem creating the storage folder on '.$uploadServerDetails['ipAddress'];
}
}
// upload via ftp
if(!$fileUpload->error)
{
$file_path = $uploadPathDir . '/' . $newFilename;
clearstatcache();
if ($uploaded_file && is_uploaded_file($uploaded_file))
{
// initiate ftp
$ret = ftp_nb_put($conn_id, $file_path, $uploaded_file,
FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA)
{
// continue uploading
$ret = ftp_nb_continue($conn_id);
}
if ($ret != FTP_FINISHED)
{
$fileUpload->error = 'There was a problem uploading the file to '.$uploadServerDetails['ipAddress'];
}
else
{
$file_size = filesize($uploaded_file);
@unlink($uploaded_file);
}
}
}
// close ftp connection
ftp_close($conn_id);
}
// move into local storage
else
{
// create the upload folder
$uploadPathDir = $this->options['upload_dir'] . substr($newFilename, 0, 2);
@mkdir($uploadPathDir);
$file_path = $uploadPathDir . '/' . $newFilename;
clearstatcache();
if ($uploaded_file && is_uploaded_file($uploaded_file))
{
move_uploaded_file($uploaded_file, $file_path);
}
$file_size = filesize($file_path);
}
// check filesize uploaded matches tmp uploaded
if ($file_size === $fileUpload->size)
{
$fileUpload->url = $this->options['upload_url'] . rawurlencode($fileUpload->name);
// insert into the db
$fileUpload->size = $file_size;
$fileUpload->delete_url = '~d?' . $this->options['delete_hash'];
$fileUpload->info_url = '~i?' . $this->options['delete_hash'];
$fileUpload->delete_type = 'DELETE';
// create delete hash, make sure it's unique
$deleteHash = md5($fileUpload->name . getUsersIPAddress() . microtime());
$existingFile = file::loadByDeleteHash($deleteHash);
while ($existingFile != false)
{
$deleteHash = md5($fileUpload->name . getUsersIPAddress() . microtime());
$existingFile = file::loadByDeleteHash($deleteHash);
}
// store in db
$db = Database::getDatabase(true);
$dbInsert = new DBObject("file", array("originalFilename", "shortUrl", "fileType", "extension", "fileSize", "localFilePath", "userId", "totalDownload", "uploadedIP", "uploadedDate", "statusId", "deleteHash", "serverId"));
$dbInsert->originalFilename = $fileUpload->name;
$dbInsert->shortUrl = 'temp';
$dbInsert->fileType = $fileUpload->type;
$dbInsert->extension = $extension;
$dbInsert->fileSize = $fileUpload->size;
$dbInsert->localFilePath = str_replace($this->options['upload_dir'], "", $file_path);
// add user id if user is logged in
$dbInsert->userId = NULL;
$Auth = Auth::getAuth();
if ($Auth->loggedIn())
{
$dbInsert->userId = (int) $Auth->id;
}
$dbInsert->totalDownload = 0;
$dbInsert->uploadedIP = getUsersIPAddress();
$dbInsert->uploadedDate = sqlDateTime();
$dbInsert->statusId = 1;
$dbInsert->deleteHash = $deleteHash;
$dbInsert->serverId = $uploadServerId;
if (!$dbInsert->insert())
{
$fileUpload->error = 'abort';
}
// create short url
$tracker = 1;
$shortUrl = file::createShortUrlPart($tracker . $dbInsert->id);
$fileTmp = file::loadByShortUrl($shortUrl);
while ($fileTmp)
{
$shortUrl = file::createShortUrlPart($tracker . $dbInsert->id);
$fileTmp = file::loadByShortUrl($shortUrl);
$tracker++;
}
// update short url
file::updateShortUrl($dbInsert->id, $shortUrl);
// update fileUpload with file location
$file = file::loadByShortUrl($shortUrl);
$fileUpload->url = $file->getFullShortUrl();
$fileUpload->delete_url = $file->getDeleteUrl();
$fileUpload->info_url = $file->getInfoUrl();
$fileUpload->stats_url = $file->getStatisticsUrl();
$fileUpload->short_url = $shortUrl;
}
else if ($this->options['discard_aborted_uploads'])
{
//@TODO - made ftp compatible
@unlink($file_path);
@unlink($uploaded_file);
if(!isset($fileUpload->error))
{
$fileUpload->error = 'maxFileSize';
}
}
}
return $fileUpload;
}
public function get()
{
$file_name = isset($_REQUEST['file']) ?
basename(stripslashes($_REQUEST['file'])) : null;
if ($file_name)
{
$info = $this->get_file_object($file_name);
} else
{
$info = $this->get_file_objects();
}
header('Content-type: application/json');
echo json_encode($info);
}
public function post()
{
$upload = isset($_FILES[$this->options['param_name']]) ?
$_FILES[$this->options['param_name']] : array(
'tmp_name' => null,
'name' => null,
'size' => null,
'type' => null,
'error' => null
);
$info = array();
if (is_array($upload['tmp_name']))
{
foreach ($upload['tmp_name'] as $index => $value)
{
$info[] = $this->handle_file_upload($upload['tmp_name'][$index],
isset($_SERVER['HTTP_X_FILE_NAME']) ? $_SERVER['HTTP_X_FILE_NAME'] : $upload['name'][$index],
isset($_SERVER['HTTP_X_FILE_SIZE']) ? $_SERVER['HTTP_X_FILE_SIZE'] : $upload['size'][$index],
isset($_SERVER['HTTP_X_FILE_TYPE']) ? $_SERVER['HTTP_X_FILE_TYPE'] : $upload['type'][$index],
$upload['error'][$index]
);
}
} else
{
$info[] = $this->handle_file_upload($upload['tmp_name'],
isset($_SERVER['HTTP_X_FILE_NAME']) ? $_SERVER['HTTP_X_FILE_NAME'] : $upload['name'],
isset($_SERVER['HTTP_X_FILE_SIZE']) ? $_SERVER['HTTP_X_FILE_SIZE'] : $upload['size'],
isset($_SERVER['HTTP_X_FILE_TYPE']) ? $_SERVER['HTTP_X_FILE_TYPE'] : $upload['type'],
$upload['error']
);
}
header('Vary: Accept');
if (isset($_SERVER['HTTP_ACCEPT']) &&
(strpos($_SERVER['HTTP_ACCEPT'], 'application/json') !== false))
{
header('Content-type: application/json');
} else
{
header('Content-type: text/plain');
}
echo json_encode($info);
}
}
$upload_handler = new uploadHandler();
header('Pragma: no-cache');
header('Cache-Control: private, no-cache');
header('Content-Disposition: inline; filename="files.json"');
// check we are receiving the request from this script
if (!checkReferrer())
{
// exit
header('HTTP/1.0 400 Bad Request');
exit();
}
switch ($_SERVER['REQUEST_METHOD'])
{
case 'HEAD':
case 'GET':
$upload_handler->get();
break;
case 'POST':
$upload_handler->post();
break;
default:
header('HTTP/1.0 405 Method Not Allowed');
}