Check in

Checking in means we have to use all four services.

To check-in, we first need to verify and authorize the calling user, so no one else goes checking in to the room that you've waited so long for. You'll see this in the authorizer block. While the implementation of the authorizer itself is rudimentary, just having anything here makes the solution as a whole better.

code/Reservation/Reservation/serverless.yml

CheckIn:
  handler: src/infrastructure/adapters/web/CheckIn.handler
  description: Check in to slot
  events:
    - http:
  method: POST
  path: /CheckIn
  authorizer:
  name: Authorizer
  resultTtlInSeconds: ${self:custom.config.apiGatewayCachingTtlValue}
  identitySource: method.request.header.Authorization
  type: request
  request:
  schemas:
  application/json: ${file(schema/Id.validator.json)}

In the use case code, we will load the Slot DTO and pass it to the respective method.

code/Reservation/Reservation/src/application/usecases/CheckInUseCase.ts

export async function CheckInUseCase(
  dependencies: Dependencies,
  slotId: SlotId
) {
  const slotLoader = createSlotLoaderService(dependencies.repository);
  const slotDto = await slotLoader.loadSlot(slotId);

  const reservationService = new ReservationService(dependencies);
  await reservationService.checkIn(slotDto);
}