realfan/public/signup/index.php

<?php require_once '/src/base.php' ?>
<?php

$function      = null;
$signup_method = null;
if (isset($_SERVER['REDIRECT_URL'])) {

	# process URI
	$path = trim($_SERVER['REDIRECT_URL'], '/');
	$args = explode('/', $path);

	# no args is very unlikely, but still
	if (count($args) === 0) {
		die('Unexpected error');
	}

	# get the signup method from URL
	if (str_contains($args[1], ':')) {
		$ps = explode(':', $args[1]);
		$signup_method = $ps[0];
		$function      = $ps[1];
	} else {
		$signup_method = $args[1];
		$function      = 'view';
	}

	if (!in_array($signup_method, ['mastodon'])) {
		die('The given signup method does not exist');
	}

	if (!in_array($function, ['view', 'oauth'])) {
		die('The given function is not correct');
	}

} else {
	$function = 'view';
}

if ($function === 'oauth') {
	$ID   = $_GET['id'] ?? '';
	$code = $_GET['code'] ?? '';
	if (empty($code) || empty($ID)) {
		header('Location: /signup'); die;
	}

	switch ($signup_method) {
		case 'mastodon':
			require '/src/action/oauth/mastodon.php';
			break;
	}
}

?>
<?php require '/src/views/head.php' ?>
<?php require '/src/views/public/head.php' ?>

<main>
SIGNUP: <?php echo $signup_method ?>
<br>
FUNCTION: <?php echo $function ?>
</main>

<?php require '/src/js/api.php' ?>
<script>

window.onload = function(e) {
	<?php if ($function === 'view'): ?>

	console.log('view');

	<?php elseif ($function === 'oauth'): ?>

	console.log('oauth');

	<?php endif ?>
}

</script>
<?php require '/src/views/public/foot.php' ?>
<?php require '/src/views/foot.php' ?>