willy.club/routes/willychat.php

<?php

use WillySoft\Http\Route;

abstract class WillyChat {
    public static string $data_path;
    public static array $messages;
}

Route::middleware(function() {
    WillyChat::$data_path = '/dev/shm/database.json';

    if (!file_exists(WillyChat::$data_path)) {
        file_put_contents(
            WillyChat::$data_path, 
            json_encode([])
        );
    }

    WillyChat::$messages = json_decode(
        file_get_contents(WillyChat::$data_path),
        true
    );
});

Route::match('get|post','/willychat/', function() {
    $default_nick = 'Willy';
    $nick = $default_nick; 
    $just_sent_message = false;

    if (!empty($_POST)) {
        $nick = filter_input(INPUT_POST, 'nick');
        $text = filter_input(INPUT_POST, 'text');

        if (empty(trim($nick, ' '))) {
            $nick = $default_nick;
        }

        if (strlen($nick) > 128) {
            view('pages/willychat/error', [
                'error' => 'Your nickname is too long.'
            ]);
            die();
        }

        if (strlen($text) > 4096) {
            view('pages/willychat/error', [
                'error' => 'Do not send EXTREMELY long messages.'
            ]);
            die();
        }

        if (count(WillyChat::$messages) > 10) {
            array_pop(WillyChat::$messages);
        }

        if (!empty(trim($text, ' '))) {

            array_unshift(WillyChat::$messages, [
                'nick' => $nick,
                'date' => time(),
                'text' => $text
            ]);

            file_put_contents(WillyChat::$data_path,
                json_encode(
                    WillyChat::$messages
                )
            );
        }

        $just_sent_message = true;
    }
    
    view('pages/willychat/index', [
        'nick' => $nick,
        'just_sent_message' => $just_sent_message,
    ]);
});

Route::get('/willychat/messages', function() {
    view('pages/willychat/messages', [
        'messages' => WillyChat::$messages
    ]); 
});

Route::get('/willychat/sync', function() {
    json_response(
        hash('crc32', serialize(WillyChat::$messages))
    );
});