header-builder-for-destination.ts

/* Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. */

import { MapType } from '@sap-cloud-sdk/util';
import { Destination } from '../scp-cf';
import { buildAuthorizationHeaders } from './authorization-header';
import {
  getHeader,
  replaceDuplicateKeys,
  filterNullishValues
} from './headers-util';

async function getAuthHeaders(
  destination: Destination,
  customHeaders?: MapType<any>
): Promise<MapType<string>> {
  const customAuthHeaders = getHeader('authorization', customHeaders);
  return Object.keys(customAuthHeaders).length
    ? customAuthHeaders
    : buildAuthorizationHeaders(destination);
}

/**
 * Builds the authorization, proxy authorization and SAP headers for a given destination.
 *
 * @param destination - A destination.
 * @param customHeaders - Custom default headers for the resulting HTTP headers.
 * @returns HTTP headers for the given destination.
 */
export async function buildHeadersForDestination(
  destination: Destination,
  customHeaders?: MapType<any>
): Promise<MapType<string>> {
  const authHeaders = await getAuthHeaders(destination, customHeaders);

  const sapHeaders = replaceDuplicateKeys(
    filterNullishValues({
      'sap-client': destination.sapClient,
      'SAP-Connectivity-SCC-Location_ID': destination.cloudConnectorLocationId
    }),
    customHeaders
  );

  return { ...authHeaders, ...sapHeaders };
}