sharenix/sharex custom uploader

.sharenix.json

{
    "DefaultFileUploader": "example.com",
    "DefaultImageUploader": "example.com",
    "DefaultUrlShortener": "waa.ai",

    "Services": [
	{
 	   "Name": "example.com",
           "DestinationType": "ImageUploader, FileUploader",
           "RequestType": "GET",
           "RequestURL": "https://example.com/upload.php?key=YOURAPIKEY",
           "FileFormName": "image",
           "ResponseType": "Text",
           "URL": "$json:data.link$",
           "ThumbnailURL": "",
           "DeletionURL": "$json:file.delete_url$"
        }
    ]
}

README.md

USE THIS: https://github.com/creepinson/sharex-server/blob/master/README.md

upload.php

<?php
// Description: Dumb uploader for flameshot software fork.
// https://github.com/seamus-45/flameshot/tree/custom-upload-hosting

// Settings
$basePath = './files';

$config = [
    'max_upload_size' => 16*1024*1024,
    'upload_path' => $basePath,
    'shorten_url' => true,
    'base_url' => 'https://'.$_SERVER['SERVER_NAME'].$basePath.'/',
];

// Allowed extensions
$config['allowed_exts'] = [
    'jpg' => 'image/jpeg',
    'png' => 'image/png',
    'json' => 'application/json',
    'gif' => 'image/gif',
    'mp4' => 'video/mp4',
];

// Api keys
$config['keys'] = array("YOURAPIKEY", "SOMEOTHERAPIKEY");

// Creates a short link by creating an actual symlink
function get_short_link($sha1, $ext) {
    $link_size = 6;
    $full = $sha1.'.'.$ext;
    $short = substr($sha1, 0, $link_size).'.'.$ext;
    $link = false;
    if (file_exists($short)) {
        $link = readlink($short);
    }

    while ((false != $link) && (basename($link) != $full)) {
        $link_size += 1;
        $short = substr($sha1, 0, $link_size).'.'.$ext;
        $link = readlink($short);
    }
    if ($link == false) {
        symlink($full, $short);
    }
    return $short;
}

// Upload file
function uploadfile($file, $config) {
    // Check error value.
    switch ($file['error']) {
        case UPLOAD_ERR_OK:
            break;
        case UPLOAD_ERR_NO_FILE:
            throw new RuntimeException('No file sent.');
        case UPLOAD_ERR_INI_SIZE:
        case UPLOAD_ERR_FORM_SIZE:
            throw new RuntimeException('Exceeded filesize limit.');
        default:
            throw new RuntimeException('Unknown error.');
    }

    // Check filesize.
    if ($file['size'] > $config['max_upload_size']) {
        throw new RuntimeException('Exceeded filesize limit.');
    }

    // Check MIME Type.
    $finfo = new finfo(FILEINFO_MIME_TYPE);
    if (false === $ext = array_search(
        $finfo->file($file['tmp_name']),
        $config['allowed_exts'],
        true
    )) {
        throw new RuntimeException('Invalid file format.');
    }

    // Obtain safe unique name from its binary data.
    $sha1 = sha1_file($file['tmp_name']);
    $finalname = $sha1.'.'.$ext;

    // Move file to final location
    if (!move_uploaded_file(
        $file['tmp_name'],
        $finalname
    )) {
        throw new RuntimeException('Failed to move uploaded file.');
    }

    // Make short URL if requested
    if ($config['shorten_url']) {
        $finalname = get_short_link($sha1, $ext);
    }

    return [ 'name'=>$file['name'], 'link'=> $config['base_url'].$finalname, 'hash'=>$sha1, 'size'=>$file['size'] ];
}

// Main
header('Content-Type:  application/json; charset=utf-8');
$answer = [];

$upload_path = realpath($config['upload_path']).DIRECTORY_SEPARATOR;
chdir($upload_path);

try {
    // Make some checks
    if (
        !isset($_FILES['image']['error']) ||
        !is_array($_FILES['image'])
    ) {
        throw new RuntimeException('Invalid parameters.');
    }

    $key = $_GET['key'];

    if (!isset($key) || $key === '' || !in_array($key, $config['keys'])) {
        throw new RuntimeException('Invalid api key.');
    }

    $result = uploadfile($_FILES['image'], $config);

    $answer['success'] = true;
    $answer['data'] = $result;

} catch (RuntimeException $e) {

    $answer['success'] = false;
    $answer['status'] = 400;
    $answer['description'] = $e->getMessage();
}

print(preg_replace('/\\\"/',"\"", json_encode($answer)));

?>