fix: POST v2/bookings - recurrenceCount (with eventType reoccuring enabled) causes lengthInMinutes to be ignored (#23023)

* fix

* added tests

* chore

apps/api/v2/src/ee/bookings/2024-08-13/controllers/e2e/variable-length-bookings.e2e-spec.ts

@@ -21,7 +21,12 @@ import { randomString } from "test/utils/randomString";
 import { withApiAuth } from "test/utils/withApiAuth";
 
 import { CAL_API_VERSION_HEADER, SUCCESS_STATUS, VERSION_2024_08_13 } from "@calcom/platform-constants";
-import { CreateBookingInput_2024_08_13, BookingOutput_2024_08_13 } from "@calcom/platform-types";
+import {
+  CreateBookingInput_2024_08_13,
+  BookingOutput_2024_08_13,
+  CreateRecurringBookingInput_2024_08_13,
+  RecurringBookingOutput_2024_08_13,
+} from "@calcom/platform-types";
 import { PlatformOAuthClient, Team } from "@calcom/prisma/client";
 
 describe("Bookings Endpoints 2024-08-13", () => {
@@ -44,6 +49,8 @@ describe("Bookings Endpoints 2024-08-13", () => {
     const VARIABLE_LENGTH_EVENT_TYPE_SLUG = `variable-length-bookings-2024-08-13-event-type-${randomString()}`;
     let normalEventType: EventType;
     const NORMAL_EVENT_TYPE_SLUG = `variable-length-bookings-2024-08-13-event-type-${randomString()}`;
+    let variableLengthRecurringEventType: EventType;
+    const VARIABLE_LENGTH_RECURRING_EVENT_TYPE_SLUG = `variable-length-recurring-bookings-2024-08-13-event-type-${randomString()}`;
 
     beforeAll(async () => {
       const moduleRef = await withApiAuth(
@@ -105,6 +112,17 @@ describe("Bookings Endpoints 2024-08-13", () => {
         user.id
       );
 
+      variableLengthRecurringEventType = await eventTypesRepositoryFixture.create(
+        {
+          title: `variable-length-recurring-bookings-2024-08-13-event-type-${randomString()}`,
+          slug: VARIABLE_LENGTH_RECURRING_EVENT_TYPE_SLUG,
+          length: 15,
+          metadata: { multipleDuration: [15, 30, 60] },
+          recurringEvent: { freq: 2, count: 3, interval: 1 }, // Weekly, 3 times, every 1 week
+        },
+        user.id
+      );
+
       app = moduleRef.createNestApplication();
       bootstrap(app as NestExpressApplication);
 
@@ -246,6 +264,63 @@ describe("Bookings Endpoints 2024-08-13", () => {
       });
     });
 
+    describe("create recurring bookings", () => {
+      it("should create recurring bookings with custom lengthInMinutes", async () => {
+        const lengthInMinutes = 30;
+        const body: CreateRecurringBookingInput_2024_08_13 = {
+          start: new Date(Date.UTC(2030, 1, 1, 14, 0, 0)).toISOString(),
+          eventTypeId: variableLengthRecurringEventType.id,
+          lengthInMinutes,
+          recurrenceCount: 2,
+          attendee: {
+            name: "Mr Recurring",
+            email: "mr_recurring@gmail.com",
+            timeZone: "Europe/Rome",
+            language: "it",
+          },
+        };
+
+        return request(app.getHttpServer())
+          .post("/v2/bookings")
+          .send(body)
+          .set(CAL_API_VERSION_HEADER, VERSION_2024_08_13)
+          .expect(201)
+          .then(async (response) => {
+            const responseBody: { status: string; data: RecurringBookingOutput_2024_08_13[] } = response.body;
+            expect(responseBody.status).toEqual(SUCCESS_STATUS);
+            expect(responseBody.data).toBeDefined();
+            expect(Array.isArray(responseBody.data)).toBe(true);
+            expect(responseBody.data).toHaveLength(2);
+
+            const firstBooking = responseBody.data[0];
+            const secondBooking = responseBody.data[1];
+            expect(firstBooking.duration).toEqual(lengthInMinutes);
+            expect(secondBooking.duration).toEqual(lengthInMinutes);
+          });
+      });
+
+      it("should reject recurring booking with invalid lengthInMinutes", async () => {
+        const body: CreateRecurringBookingInput_2024_08_13 = {
+          start: new Date(Date.UTC(2030, 3, 1, 10, 0, 0)).toISOString(),
+          eventTypeId: variableLengthRecurringEventType.id,
+          lengthInMinutes: 45, // Not in allowed [15, 30, 60]
+          recurrenceCount: 2,
+          attendee: {
+            name: "Mr Invalid",
+            email: "mr_invalid@gmail.com",
+            timeZone: "Europe/Rome",
+            language: "it",
+          },
+        };
+
+        return request(app.getHttpServer())
+          .post("/v2/bookings")
+          .send(body)
+          .set(CAL_API_VERSION_HEADER, VERSION_2024_08_13)
+          .expect(400);
+      });
+    });
+
     afterAll(async () => {
       await oauthClientRepositoryFixture.delete(oAuthClient.id);
       await teamRepositoryFixture.delete(organization.id);

apps/api/v2/src/ee/bookings/2024-08-13/services/input.service.ts

@@ -420,6 +420,9 @@ export class InputBookingsService_2024_08_13 {
       throw new NotFoundException(`Event type with id=${inputBooking.eventTypeId} is not a recurring event`);
     }
 
+    this.validateBookingLengthInMinutes(inputBooking, eventType);
+    const lengthInMinutes = inputBooking.lengthInMinutes ?? eventType.length;
+
     const occurrence = recurringEventSchema.parse(eventType.recurringEvent);
     const repeatsEvery = occurrence.interval;
 
@@ -456,7 +459,7 @@ export class InputBookingsService_2024_08_13 {
     const location = inputLocation ? this.transformLocation(inputLocation) : undefined;
 
     for (let i = 0; i < repeatsTimes; i++) {
-      const endTime = startTime.plus({ minutes: eventType.length });
+      const endTime = startTime.plus({ minutes: lengthInMinutes });
 
       events.push({
         start: startTime.toISO(),