Add DnsRecordCommand to CliCommands for DNS configuration

src/Socialbox/Classes/CliCommands/DnsRecordCommand.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Socialbox\Classes\CliCommands;
+
+use Socialbox\Classes\Configuration;
+use Socialbox\Classes\Logger;
+use Socialbox\Interfaces\CliCommandInterface;
+
+class DnsRecordCommand implements CliCommandInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public static function execute(array $args): int
+    {
+        $txt_record = sprintf('v=socialbox;sb-rpc=%s;sb-key=%s',
+            Configuration::getInstanceConfiguration()->getRpcEndpoint(),
+            Configuration::getInstanceConfiguration()->getPublicKey()
+        );
+
+        Logger::getLogger()->info('Please set the following DNS TXT record for the domain:');
+        Logger::getLogger()->info(sprintf('  %s', $txt_record));
+        return 0;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public static function getHelpMessage(): string
+    {
+        return <<<HELP
+Usage: socialbox dns-record
+
+Displays the DNS TXT record that should be set for the domain.
+HELP;
+
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public static function getShortHelpMessage(): string
+    {
+        return 'Displays the DNS TXT record that should be set for the domain.';
+    }
+}