Merge pull request #1697 from appwrite/validate-function-cron

Validate cron before updating function

src/routes/(console)/project-[project]/functions/function-[function]/settings/updateSchedule.svelte

@@ -11,6 +11,7 @@
     import { func } from '../store';
     import { isValueOfStringEnum } from '$lib/helpers/types';
     import { Runtime } from '@appwrite.io/console';
+    import { parseExpression } from 'cron-parser';
 
     const functionId = $page.params.function;
     let functionSchedule: string = null;
@@ -24,6 +25,10 @@
             if (!isValueOfStringEnum(Runtime, $func.runtime)) {
                 throw new Error(`Invalid runtime: ${$func.runtime}`);
             }
+
+            // an error is shown if invalid.
+            parseExpression(functionSchedule);
+
             await sdk.forProject.functions.update(
                 functionId,
                 $func.name,