I've had this specific upload form for a few months and just recently have I been getting a lot of complaints from people that are accidently overwriting files already hosted.
This is a major concern for me, as it has messed up a lot of saved data.
Can someone help me modify this script, so if a file named SS101.jpg already exists in folder /files/ then it will not upload the file.
<?
//vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
// You may change maxsize, and allowable upload file types.
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
//Mmaximum file size. You may increase or decrease.
$MAX_SIZE = 10000;
//Allowable file ext. names. you may add more extension names.
$FILE_EXTS = array('.mng','.bmp','.jpg','.png','.gif','.txt','.html','.htm','.zip','.rtf','.doc','.rtf','.psd','.mng','.amr');
//Allow file delete? no, if only allow upload only
$DELETABLE = false;
//vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
// Do not touch the below if you are not confident.
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/************************************************************
* Setup variables
************************************************************/
$site_name = $_SERVER['HTTP_HOST'];
$url_dir = "http://".$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);
$url_this = "http://".$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
$upload_dir = "files/";
$upload_url = $url_dir."/files/";
$message ="";
/************************************************************
* Create Upload Directory
************************************************************/
if (!is_dir("files")) {
if (!mkdir($upload_dir))
die ("upload_files directory doesn't exist and creation failed");
if (!chmod($upload_dir,0755))
die ("change permission to 755 failed.");
}
/************************************************************
* Process User's Request
************************************************************/
if ($_REQUEST[del] && $DELETABLE) {
$resource = fopen("log.txt","a");
fwrite($resource,date("Ymd h:i:s")."DELETE - $_SERVER[REMOTE_ADDR]"."$_REQUEST[del]\n");
fclose($resource);
if (strpos($_REQUEST[del],"/.")>0); //possible hacking
else if (strpos($_REQUEST[del],$upload_dir) === false); //possible hacking
else if (substr($_REQUEST[del],0,6)==$upload_dir) {
unlink($_REQUEST[del]);
print "<script>window.location.href='$url_this?message=Deleted successfully.'</script>";
}
}
else if ($_FILES['userfile']) {
$resource = fopen("log.txt","a");
fwrite($resource,date("Ymd h:i:s")."UPLOAD - $_SERVER[REMOTE_ADDR]"
.$_FILES['userfile']['name']." "
.$_FILES['userfile']['type']."\n");
fclose($resource);
$file_type = $_FILES['userfile']['type'];
$file_name = $_FILES['userfile']['name'];
$file_ext = strtolower(substr($file_name,strrpos($file_name,".")));
//File Size Check
if ( $_FILES['userfile']['size'] > $MAX_SIZE)
$message = "The file size is over 10MB.";
//File Extension Check
else if (!in_array($file_ext, $FILE_EXTS))
$message = "Sorry, $file_name($file_type) is not allowed to be uploaded.";
else
$message = do_upload($upload_dir, $upload_url);
print "<script>window.location.href='$url_this?message=$message'</script>";
}
else if (!$_FILES['userfile']);
else
$message = "Invalid File Specified.";
/************************************************************
* List Files
************************************************************/
$handle=opendir($upload_dir);
$filelist = "";
$name = str_replace(" ","_",$name);
while ($file = readdir($handle)) {
if(!is_dir($file) && !is_link($file)) {
$filelist .= "<a href='$upload_dir$file'><b>$file</b></a>";
if ($DELETABLE)
$filelist .= " <a href='?del=$upload_dir".urlencode($file)."' title='delete'><b> (DELETE)</b></a>";
$filelist .="<br>";
}
}
function do_upload($upload_dir, $upload_url) {
$temp_name = $_FILES['userfile']['tmp_name'];
$file_name = $_FILES['userfile']['name'];
$file_name = str_replace("\\","",$file_name);
$file_name = str_replace("'","",$file_name);
$file_name = str_replace(" ","_",$file_name);
$length=strlen($_FILES['userfile']['name']);
$file_path = $upload_dir.$file_name;
//File Name Check
if ( $file_name =="") {
$message = "Invalid File Name Specified";
return $message;
}
$result = move_uploaded_file($temp_name, $file_path);
if (!chmod($file_path,0777))
$message = "change permission to 777 failed.";
else
$message = ($result)?"$file_name has uploaded successfully." :
"Oops! Something is wrong with uploading the file.";
return $message;
}
?>
I have tried a few methods I've found on google, but none of them seem to work. Obviously if I knew a lot about Php, I'd be able to do this my self...
I may not, I absolutely love this script, and I'd love to have the solution for this script, and not a totally different upload script.
