ulddld.php

<?php
// ulddld.php
// uldとdldで使用するサーバープログラム。データフォルダは手動で作成。
// 「uld」-> https://pastebin.com/KsMM0Fjt
// 「dld」-> https://pastebin.com/zNZECshU
define("PASSWORD", "xxxxxx");
define("DATA_FOLDER", "ulddld/");
define("NAME_FILE_NAME", DATA_FOLDER . "the_file_name.txt");
define("DATA_FILE_NAME", DATA_FOLDER . "the_file_data.txt");
function execute() {
    if (false == isset($_POST["command"])) {
        echo "NG\n";
        echo "Error No.1\n";
        return;
    }
    $command = $_POST["command"];
    if (false == isset($_POST["password"])) {
        echo "NG\n";
        echo "Error No.2\n";
        return;
    }
    $password = $_POST["password"];
    if (PASSWORD !== $password) {
        echo "NG\n";
        echo "Error No.3\n";
        return;
    }
    switch ($command) {
        case "uld":
            doUld();
            break;
        case "dld":
            doDld();
            break;
    }
}
function doUld() {
    if(!(isset($_POST["fileName"]) &&
         isset($_POST["fileData"]))) {
        echo "NG\n";
        echo "Error No.4\n";
    } else {
        $fileName = $_POST["fileName"];
        file_put_contents(NAME_FILE_NAME, $fileName);
        $fileData = $_POST["fileData"];
        file_put_contents(DATA_FILE_NAME, $fileData);
        echo "OK\n";
    }
}
function doDld() {
    if (false) {
        echo "NG\n";
        echo "Error No.5\n";
    } else {
        $fileName = file_get_contents(NAME_FILE_NAME);
        $fileData = file_get_contents(DATA_FILE_NAME);
        echo "OK\n";
        echo $fileName . "\n";
        echo $fileData;
    }
}
execute();
?>