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Add ResolvedServersManager and integrate with ServerResolver

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netkas 2024-10-25 14:23:43 -04:00
parent d2dbafe728
commit ce64643d73
7 changed files with 345 additions and 26 deletions
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85
src/Socialbox/Classes/ServerResolver.php
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@ -2,51 +2,96 @@
namespace Socialbox\Classes;
use Socialbox\Exceptions\DatabaseOperationException;
use Socialbox\Exceptions\ResolutionException;
use Socialbox\Managers\ResolvedServersManager;
use Socialbox\Objects\ResolvedServer;
class ServerResolver
{
private const string PATTERN = '/v=socialbox;sb-rpc=(https?:\/\/[^;]+);sb-key=([^;]+)/';
/**
* 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.
* @throws DatabaseOperationException
*/
public static function resolveDomain(string $domain): ResolvedServer
{
$txtRecords = dns_get_record($domain, DNS_TXT);
// First query the database to check if the domain is already resolved
if(ResolvedServersManager::resolvedServerExists($domain))
{
// If the resolved server was updated in the last 30 minutes, return it
if(ResolvedServersManager::getResolvedServerUpdated($domain) > (time() - 1800))
{
return ResolvedServersManager::getResolvedServer($domain)->toResolvedServer();
}
}
$txtRecords = self::dnsGetTxtRecords($domain);
if ($txtRecords === false)
{
throw new ResolutionException(sprintf("Failed to resolve DNS TXT records for %s", $domain));
}
$endpoint = null;
$publicKey = null;
$fullRecord = self::concatenateTxtRecords($txtRecords);
if (preg_match(self::PATTERN, $fullRecord, $matches))
{
$endpoint = trim($matches[1]);
$publicKey = trim(str_replace(' ', '', $matches[2]));
if (empty($endpoint))
{
throw new ResolutionException(sprintf("Failed to resolve RPC endpoint for %s", $domain));
}
if (empty($publicKey))
{
throw new ResolutionException(sprintf("Failed to resolve public key for %s", $domain));
}
return new ResolvedServer($endpoint, $publicKey);
}
else
{
throw new ResolutionException(sprintf("Failed to find valid SocialBox record for %s", $domain));
}
}
/**
* Retrieves the TXT records for a given domain using the dns_get_record function.
*
* @param string $domain The domain name to fetch TXT records for.
* @return array|false An array of DNS TXT records on success, or false on failure.
*/
private static function dnsGetTxtRecords(string $domain)
{
return dns_get_record($domain, DNS_TXT);
}
/**
* Concatenates an array of TXT records into a single string.
*
* @param array $txtRecords An array of TXT records, where each record is expected to have a 'txt' key.
* @return string A concatenated string of all TXT records.
*/
private static function concatenateTxtRecords(array $txtRecords): string
{
$fullRecordBuilder = '';
foreach ($txtRecords as $txt)
{
if (isset($txt['txt']) && str_starts_with($txt['txt'], 'socialbox='))
if (isset($txt['txt']))
{
$endpoint = substr($txt['txt'], strlen('socialbox='));
}
elseif (isset($txt['txt']) && str_starts_with($txt['txt'], 'socialbox-key='))
{
$publicKey = substr($txt['txt'], strlen('socialbox-key='));
$fullRecordBuilder .= trim($txt['txt'], '" ');
}
}
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);
return $fullRecordBuilder;
}
}