pg-act/ns/zone-add: modernize code presentation

pg-act/ns/zone-add.php

@@ -1,17 +1,18 @@
 <?php declare(strict_types=1);
 
-$_POST['domain'] = formatAbsoluteDomain($_POST['domain']);
+$domain = formatAbsoluteDomain($_POST['domain']);
 
-if (query('select', 'zones', ['zone' => $_POST['domain']], 'zone') !== [])
+if (query('select', 'zones', ['zone' => $domain], 'zone') !== [])
 	output(403, _('This zone already exists on the service.'));
 
-$parent_authoritatives = array_column(kdig(name: ltrim(strstr($_POST['domain'], '.'), '.'), type: 'NS', server: (CONF['ns']['local_only_check'] ? CONF['reg']['address'] : NULL))['answerRRs'], 'rdataNS');
+$parent_domain = ltrim(strstr($domain, '.'), '.');
+$parent_authoritatives = array_column(kdig(name: $parent_domain, type: 'NS', server: (CONF['ns']['local_only_check'] ? CONF['reg']['address'] : NULL))['answerRRs'] ?? [], 'rdataNS');
 if ($parent_authoritatives === [])
 	output(403, _('Parent zone\'s name servers not found.'));
 foreach ($parent_authoritatives as $parent_authoritative)
 	checkAbsoluteDomainFormat($parent_authoritative);
 
-$ns_records = array_column(kdig(name: $_POST['domain'], type: 'NS', server: (CONF['ns']['local_only_check'] ? CONF['reg']['address'] : $parent_authoritatives[0]))['authorityRRs'], 'rdataNS');
+$ns_records = array_column(kdig(name: $domain, type: 'NS', server: (CONF['ns']['local_only_check'] ? CONF['reg']['address'] : $parent_authoritatives[0]))['authorityRRs'], 'rdataNS');
 if (preg_match('/^(?<salt>[0-9a-f]{8})-(?<hash>[0-9a-f]{32})\._domain-verification\.' . preg_quote(SERVER_NAME, '/') . '\.$/Dm', implode(LF, $ns_records), $matches) !== 1)
 	output(403, _('NS authentication record not found.'));
 
@@ -20,13 +21,13 @@ checkAuthToken($matches['salt'], $matches['hash']);
 rateLimit();
 
 insert('zones', [
-	'zone' => $_POST['domain'],
+	'zone' => $domain,
 	'username' => $_SESSION['id'],
 ]);
 
-$knotZonePath = CONF['ns']['knot_zones_path'] . '/' . $_POST['domain'] . 'zone';
-$knotZone = implode(' ', [
-	$_POST['domain'],
+$zone_path = CONF['ns']['knot_zones_path'] . '/' . $domain . 'zone';
+$zone_content = implode(' ', [
+	$domain,
 	NS_SOA_VALUES['ttl'],
 	'SOA',
 	CONF['ns']['servers'][0],
@@ -38,16 +39,16 @@ $knotZone = implode(' ', [
 	NS_SOA_VALUES['negative'],
 ]) . LF;
 foreach (CONF['ns']['servers'] as $server)
-	$knotZone .= $_POST['domain'] . ' 86400 NS ' . $server . LF;
-$knotZone .= $_POST['domain'] . ' 86400 CSYNC 0 1 NS' . LF;
-if (is_int(file_put_contents($knotZonePath, $knotZone)) !== true)
+	$zone_content .= $domain . ' 86400 NS ' . $server . LF;
+$zone_content .= $domain . ' 86400 CSYNC 0 1 NS' . LF;
+if (file_put_contents($zone_path, $zone_content) === false)
 	output(500, 'Failed to write new zone file.');
-if (chmod($knotZonePath, 0660) !== true)
+if (chmod($zone_path, 0660) !== true)
 	output(500, 'Failed to chmod new zone file.');
 
 knotcConfExec([
-	['conf-set', 'zone[' . $_POST['domain'] . ']'],
-	['conf-set', 'zone[' . $_POST['domain'] . '].template', 'servnest'],
+	['conf-set', 'zone[' . $domain . ']'],
+	['conf-set', 'zone[' . $domain . '].template', 'servnest'],
 ]);
 
 output(200, _('Zone created.'));