Server Side Image Map for tilde.club

tilde.map.php

<?php

$defaultLink = 'https://tilde.club/~harper/link.html?action=join';

$links = [
    'left' => [
        'url' => 'https://tilde.club/~harper/link.html?action=join',
        'x1' => 0,
        'y1' => 0,
        'x2' => 129,
        'y2' => 75,
        'text' => 'Join'
    ],
    'middle' => [
        'url' => 'https://tilde.club/~harper/link.html?action=random',
        'x1' => 130,
        'y1' => 0,
        'x2' => 417,
        'y2' => 75,
        'text' => 'Random'
    ],
    'right' => [
        'url' => 'https://tilde.club/~harper/link.html?action=join',
        'x1' => 418,
        'y1' => 0,
        'x2' => 549,
        'y2' => 75,
        'text' => 'Join'
]];

$validX = false;
$validY = false;
foreach ($_GET as $key => $value) {
    if (preg_match('/^(\d+),(\d+)$/', $key, $matches)) {
        $validX = $matches[1];
        $validY = $matches[2];
    }
}
if (!$validX || !$validY) {
    header("Location: $defaultLink");
    exit;
}

foreach ($links as $link) {
    if ($validX >= $link['x1'] && $validX <= $link['x2'] && $validY >= $link['y1'] && $validY <= $link['y2']) {
        header("Location: {$link['url']}");
        exit;
    }
}
header("Location: $defaultLink");