fix(media): prevent getimagesize loopback deadlocks on missing images

- Check if image URL host is internal domain in Utility::is_internal_url()
- Return false early in _detect_dimensions() when local file is missing for internal URLs
- Eliminate loopback HTTP GET requests to web server on missing images

Fixes #894

Author: faisalahammad

src/media.cls.php

@@ -1146,7 +1146,7 @@ private function _detect_dimensions( $src ) {
 		$pathinfo = Utility::is_internal_file( $src );
 		if ( $pathinfo ) {
 			$src = $pathinfo[0];
-		} elseif ( apply_filters( 'litespeed_media_ignore_remote_missing_sizes', false ) ) {
+		} elseif ( Utility::is_internal_url( $src ) || apply_filters( 'litespeed_media_ignore_remote_missing_sizes', false ) ) {
 			return false;
 		}
 
@@ -1156,7 +1156,7 @@ private function _detect_dimensions( $src ) {
 
 		try {
 			$sizes = getimagesize( $src );
-		} catch ( \Exception $e ) {
+		} catch ( \Throwable $e ) {
 			return false;
 		}
 

src/utility.cls.php

@@ -779,6 +779,31 @@ public static function internal( $host ) {
 		return false;
 	}
 
+	/**
+	 * Check if a URL belongs to an internal site or CDN domain.
+	 *
+	 * @since 7.9
+	 *
+	 * @param string $url URL.
+	 * @return bool True if internal host or relative path.
+	 */
+	public static function is_internal_url( $url ) {
+		if ( 'data:' === substr( $url, 0, 5 ) ) {
+			return false;
+		}
+
+		$url_parsed = wp_parse_url( $url );
+		if ( empty( $url_parsed['host'] ) ) {
+			return true;
+		}
+
+		if ( self::internal( $url_parsed['host'] ) || CDN::internal( $url_parsed['host'] ) ) {
+			return true;
+		}
+
+		return false;
+	}
+
 	/**
 	 * Check if a URL is an internal existing file and return its real path and size.
 	 *