fix: handle invalid package uploads

src/Admin/FileImportController.php

@@ -49,7 +49,23 @@ final class FileImportController {
 			throw new \RuntimeException( 'The package file could not be read.' );
 		}
 
-		$package = $this->transport->import( $contents );
+		try {
+			$package = $this->transport->import( $contents );
+		} catch ( \InvalidArgumentException $exception ) {
+			$this->logger->warning(
+				'Rejected imported content package.',
+				array(
+					'error' => $exception->getMessage(),
+				)
+			);
+
+			$this->redirectToDashboard(
+				array(
+					'wpcs_import_error' => $exception->getMessage(),
+				)
+			);
+			return;
+		}
 
 		$this->logger->info(
 			'Validated imported content package.',
@@ -59,9 +75,20 @@ final class FileImportController {
 			)
 		);
 
+		$this->redirectToDashboard(
+			array(
+				'wpcs_imported' => '1',
+			)
+		);
+	}
+
+	/**
+	 * @param array<string, string> $args Redirect query args.
+	 */
+	private function redirectToDashboard( array $args ): void {
 		wp_safe_redirect(
 			add_query_arg(
-				array( 'wpcs_imported' => '1' ),
+				$args,
 				admin_url( 'admin.php?page=wp-content-sync' )
 			)
 		);