Accept plugin URL in check command

includes/Checker/Abstract_Check_Runner.php

@@ -485,6 +485,12 @@ final public function get_plugin_basename() {
 
 			if ( is_dir( $plugin ) ) {
 				$this->plugin_basename = $plugin;
+			} elseif ( filter_var( $plugin, FILTER_VALIDATE_URL ) ) {
+				$plugin_full_path = Plugin_Request_Utility::download_plugin( $plugin );
+
+				if ( false !== $plugin_full_path ) {
+					$this->plugin_basename = $plugin_full_path;
+				}
 			} else {
 				$this->plugin_basename = Plugin_Request_Utility::get_plugin_basename_from_input( $plugin );
 			}

includes/Utilities/Plugin_Request_Utility.php

@@ -181,4 +181,63 @@ public static function get_files_to_ignore() {
 
 		return $files_to_ignore;
 	}
+
+	/**
+	 * Downloads the plugin from the URL.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @param string $plugin_url The URL of the plugin to download.
+	 * @return string|bool The plugin basename if the plugin is downloaded successfully, false otherwise.
+	 */
+	public static function download_plugin( $plugin_url ) {
+		$response = wp_remote_get( $plugin_url );
+
+		if ( is_wp_error( $response ) ) {
+			return false;
+		}
+
+		require_once ABSPATH . 'wp-admin/includes/file.php';
+
+		WP_Filesystem();
+
+		$basename = basename( $plugin_url );
+
+		$plugin_check_dir = self::get_temporary_upload_dir();
+
+		$file_path    = $plugin_check_dir . $basename;
+		$file_process = fopen( $file_path, 'w' );
+		fwrite( $file_process, $response['body'] );
+		fclose( $file_process );
+
+		$folder_name = pathinfo( $plugin_url, PATHINFO_FILENAME );
+
+		$target_folder_name = explode( '.', $folder_name )[0];
+
+		// Unzip file.
+		if ( unzip_file( $file_path, $plugin_check_dir ) ) {
+			unlink( $file_path );
+
+			return $plugin_check_dir . $target_folder_name;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get the upload directory for the plugin check.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @return string The upload directory for the plugin check.
+	 */
+	public static function get_temporary_upload_dir() {
+		$upload_dir = trailingslashit( get_temp_dir() ) . 'plugin-check/';
+
+		if ( ! is_dir( $upload_dir ) ) {
+			mkdir( $upload_dir, 0755, true );
+		}
+
+		return $upload_dir;
+	}
 }

tests/behat/features/plugin-check.feature

@@ -283,3 +283,16 @@ Feature: Test that the WP-CLI command works.
       """
       no_plugin_readme
       """
+
+  Scenario: Check a plugin from external zip
+    Given a WP install with the Plugin Check plugin
+
+    When I run the WP-CLI command `plugin check https://downloads.wordpress.org/plugin/hello-dolly.1.7.3.zip --fields=code,type --format=csv`
+    And STDOUT should contain:
+      """
+      WordPress.WP.AlternativeFunctions.rand_mt_rand,ERROR
+      """
+    And STDOUT should contain:
+      """
+      stable_tag_mismatch,ERROR
+      """