feat: remove is_domain_loopback — unused function with no production callers

Co-authored-by: pattonwebz <3902039+pattonwebz@users.noreply.github.com>

Author: 2 people

admin/class-helpers.php

@@ -139,71 +139,6 @@ public static function get_option_as_array( $option_name ) {
 		return [];
 	}
 
-
-	/**
-	 * Determine if a domain is hosted on a local loopback
-	 *
-	 * Results are cached in a short-lived transient to avoid repeated DNS
-	 * lookups when the same domain is checked multiple times during a scan.
-	 *
-	 * @param string $domain The domain to check.
-	 * @return boolean
-	 */
-	public static function is_domain_loopback( $domain ) {
-
-		// Check the transient cache first to avoid repeated DNS lookups.
-		$cache_key = 'edac_loopback_' . md5( sanitize_text_field( $domain ) );
-		$cached    = get_transient( $cache_key );
-
-		if ( false !== $cached ) {
-			return (bool) $cached;
-		}
-
-		// Check if this is an ipv4 address in the loopback range.
-
-		$record         = gethostbyname( $domain );
-		$loopback_start = ip2long( '127.0.0.0' );
-		$loopback_end   = ip2long( '127.255.255.255' );
-		$ip_long        = ip2long( $record );
-
-		if ( $ip_long >= $loopback_start && $ip_long <= $loopback_end ) {
-			// Store as int (1/0) so that a false result is distinguishable from a
-			// cache miss, since get_transient() also returns false on a miss.
-			set_transient( $cache_key, 1, HOUR_IN_SECONDS );
-			return true;
-		}
-
-		// Check if this is an ipv6 loopback.
-
-		try {
-			$records = dns_get_record( $domain, DNS_AAAA );
-		} catch ( \Throwable $th ) {
-			set_transient( $cache_key, 0, HOUR_IN_SECONDS );
-			return false;
-		}
-
-		foreach ( $records as $record ) {
-
-			// Do ipv6 check.
-			if ( isset( $record['type'] ) && 'AAAA' === $record['type'] ) {
-
-				// Normalize the IPv6 address for comparison.
-				$normalized_ipv6 = inet_pton( $record['ipv6'] );
-
-				// Normalize the loopback address.
-				$loopback_ipv6 = inet_pton( '::1' );
-
-				if ( $normalized_ipv6 === $loopback_ipv6 ) {
-					set_transient( $cache_key, 1, HOUR_IN_SECONDS );
-					return true;
-				}
-			}
-		}
-
-		set_transient( $cache_key, 0, HOUR_IN_SECONDS );
-		return false;
-	}
-
 	/**
 	 * Filter out inactive rules from the results returned.
 	 *