Add VariableManager, RpcClient classes, and cache enhancements

src/Socialbox/Classes/ServerResolver.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Socialbox\Classes;
+
+use Socialbox\Exceptions\ResolutionException;
+use Socialbox\Objects\ResolvedServer;
+
+class ServerResolver
+{
+    /**
+     * Resolves a given domain to fetch the RPC endpoint and public key from its DNS TXT records.
+     *
+     * @param string $domain The domain to be resolved.
+     * @return ResolvedServer An instance of ResolvedServer containing the endpoint and public key.
+     * @throws ResolutionException If the DNS TXT records cannot be resolved or if required information is missing.
+     */
+    public static function resolveDomain(string $domain): ResolvedServer
+    {
+        $txtRecords = dns_get_record($domain, DNS_TXT);
+
+        if ($txtRecords === false)
+        {
+            throw new ResolutionException(sprintf("Failed to resolve DNS TXT records for %s", $domain));
+        }
+
+        $endpoint = null;
+        $publicKey = null;
+        foreach ($txtRecords as $txt)
+        {
+            if (isset($txt['txt']) && str_starts_with($txt['txt'], 'socialbox='))
+            {
+                $endpoint = substr($txt['txt'], strlen('socialbox='));
+            }
+            elseif (isset($txt['txt']) && str_starts_with($txt['txt'], 'socialbox-key='))
+            {
+                $publicKey = substr($txt['txt'], strlen('socialbox-key='));
+            }
+        }
+
+        if ($endpoint === null)
+        {
+            throw new ResolutionException(sprintf("Failed to resolve RPC endpoint for %s", $domain));
+        }
+
+        if ($publicKey === null)
+        {
+            throw new ResolutionException(sprintf("Failed to resolve public key for %s", $domain));
+        }
+
+        return new ResolvedServer($endpoint, $publicKey);
+    }
+}