Implement scheduled library scans (closes #609) (#638)

First implementation of job system

app/src/main/frontend/App.tsx

@@ -1,6 +1,5 @@
 import {Outlet, useHref, useNavigate} from 'react-router';
 import "./main.css";
-import "Frontend/util/custom-validators";
 import {HeroUIProvider} from "@heroui/react";
 import {ThemeProvider as NextThemesProvider} from "next-themes";
 import {themeNames} from "Frontend/theming/themes";

app/src/main/frontend/components/administration/LibraryManagement.tsx

@@ -3,6 +3,7 @@ import ConfigFormField from "Frontend/components/administration/ConfigFormField"
 import withConfigPage from "Frontend/components/administration/withConfigPage";
 import Section from "Frontend/components/general/Section";
 import * as Yup from 'yup';
+import "Frontend/util/yup-extensions";
 import {addToast, Button, Divider, Tooltip, useDisclosure} from "@heroui/react";
 import {Plus} from "@phosphor-icons/react";
 import {LibraryEndpoint} from "Frontend/generated/endpoints";
@@ -55,7 +56,7 @@ function LibraryManagementLayout({getConfig, formik}: any) {
 
             <Section title="Metadata"/>
             <div className="flex flex-row items-baseline">
-                <ConfigFormField configElement={getConfig("library.metadata.update.enabled")} isDisabled/>
+                <ConfigFormField configElement={getConfig("library.metadata.update.enabled")}/>
                 <ConfigFormField configElement={getConfig("library.metadata.update.schedule")}
                                  isDisabled={!formik.values.library.metadata.update.enabled}/>
             </div>
@@ -95,8 +96,11 @@ const validationSchema = Yup.object({
     library: Yup.object({
         metadata: Yup.object({
             update: Yup.object({
-                // @ts-ignore
-                schedule: Yup.string().cron()
+                enabled: Yup.boolean(),
+                schedule: Yup.string().when("enabled", {
+                    is: true,
+                    then: (schema) => schema.cron()
+                }),
             })
         }),
         scan: Yup.object({

app/src/main/frontend/util/custom-validators.ts

@@ -1,10 +0,0 @@
-import * as Yup from "yup";
-import {isValidCron} from "cron-validator";
-
-// Custom validator for cron expressions
-Yup.addMethod(Yup.string, 'cron', function (message) {
-    return this.test('cron', message, function (value) {
-        const {path, createError} = this;
-        return isValidCron(value as string) || createError({path, message: message || 'Invalid cron expression'});
-    });
-});

app/src/main/frontend/util/yup-extensions.ts

@@ -0,0 +1,22 @@
+import * as Yup from 'yup';
+import {ConfigEndpoint} from 'Frontend/generated/endpoints';
+
+Yup.addMethod(Yup.string, 'cron', function (message = 'Invalid cron expression') {
+    return this.test('cron', message, async function (value) {
+        const {path, createError} = this;
+        if (!value) return true;
+        try {
+            const isValid = await ConfigEndpoint.validateCronExpression(value);
+            return isValid || createError({path, message});
+        } catch (e) {
+            return createError({path, message: 'Error validating cron expression'});
+        }
+    });
+});
+
+// TypeScript: Extend Yup's type definitions
+declare module 'yup' {
+    interface StringSchema {
+        cron(message?: string): StringSchema;
+    }
+}