ShareX Uploader PHP script

sharex_upload.php

<?php
 

 /*
Sharex php upload

INSTALLATION:
-Fill out $secret_key, $sharexdir (or leave blank), and $domain_url
-Upload this to the root for the selected domain
-Configure ShareX Custom Uploader: https://i.imgur.com/y4WHMTH.png (to get to that menu: https://i.imgur.com/psMj84t.png)

By: domkirby and arturtyk 
 */


$secret_key = "this is your secret to prevent uploaders you don't know from uploading, generate a random password for this"; //Set this as your secret key, to prevent others uploading to your server.
$sharexdir = ""; //This is your file dir, also the link.. Leave blank to upload the root
$domain_url = 'https://your.server.tld'; //the root domain of your upload URL, include http(s):// (use https like a grownup, this shit is free)
 
/*
This function generates a file name based on the following:
-The hex encoding of 4 random bytes pulled from the server
-A time based uniqid (similar to a uuid but for PHP), to prevent name collision
*/
function RandomString($length) {
    $random = random_bytes(4);
    $rHex = bin2hex($random);
    $Uniqid = uniqid($rHex,false);
    return $Uniqid;
}
 
if(isset($_POST['secret']))
{
    if($_POST['secret'] == $secret_key)
    {
        $filename = RandomString($lengthofstring);
        $target_file = $_FILES["sharex"]["name"];
        $fileType = pathinfo($target_file, PATHINFO_EXTENSION);
 
        if (move_uploaded_file($_FILES["sharex"]["tmp_name"], $sharexdir.$filename.'.'.$fileType))
        {
            echo $domain_url.'/'.$filename.'.'.$fileType;
        }
            else
        {
           echo 'File upload failed - CHMOD/Folder doesn\'t exist?';
        }  
    }
    else
    {
        header("HTTP/1.1 401 Unauthorized");
        echo 'Invalid Secret Key';
    }
}
else
{
    header("HTTP/1.1 400 Bad Request");
    echo 'No post data recieved';
}
?>