Read organizations endpoint region from environment variable

The region should be available in ORGANIZATIONS_ENDPOINT_REGION, but it
defaults to us-east-1 if the value is missing.

src/account-provider/is-complete-handler.lambda.ts

@@ -6,6 +6,7 @@ import * as AWS from "aws-sdk";
 import { Organizations } from "aws-sdk";
 
 let organizationsClient: AWS.Organizations;
+const organizationsRegion = process.env.ORGANIZATIONS_ENDPOINT_REGION ?? "us-east-1";
 
 /**
  * The isComplete handler is repeatedly invoked checking CreateAccountStatus until SUCCEEDED or FAILED.
@@ -15,7 +16,7 @@ export async function handler(event: IsCompleteRequest): Promise<IsCompleteRespo
   console.log(`Request of type ${event.RequestType} received`);
 
   if (!organizationsClient) {
-    organizationsClient = new AWS.Organizations({ region: "us-east-1" });
+    organizationsClient = new AWS.Organizations({ region: organizationsRegion });
   }
 
   console.log("Payload: %j", event);

src/account-provider/on-event-handler.lambda.ts

@@ -2,6 +2,7 @@ import { CdkCustomResourceEvent as OnEventRequest, CdkCustomResourceResponse as
 import { Organizations } from "aws-sdk";
 
 let organizationsClient: Organizations;
+const organizationsRegion = process.env.ORGANIZATIONS_ENDPOINT_REGION ?? "us-east-1";
 
 /**
  * The onEvent handler is invoked whenever a resource lifecycle event for an Account occurs
@@ -12,7 +13,7 @@ export async function handler(event: OnEventRequest): Promise<OnEventResponse> {
   console.log(`Request of type ${event.RequestType} received`);
 
   if (!organizationsClient) {
-    organizationsClient = new Organizations({ region: "us-east-1" });
+    organizationsClient = new Organizations({ region: organizationsRegion });
   }
 
   console.log("Payload: %j", event);

src/organization-provider/on-event-handler.lambda.ts

@@ -2,6 +2,7 @@ import { CdkCustomResourceEvent as OnEventRequest, CdkCustomResourceResponse as
 import { AWSError, Organizations } from "aws-sdk";
 
 let organizationsClient: Organizations;
+const organizationsRegion = process.env.ORGANIZATIONS_ENDPOINT_REGION ?? "us-east-1";
 
 /**
  * The onEvent handler is invoked whenever a resource lifecycle event for an organization occurs
@@ -12,7 +13,7 @@ export async function handler(event: OnEventRequest): Promise<OnEventResponse> {
   console.log(`Request of type ${event.RequestType} received`);
 
   if (!organizationsClient) {
-    organizationsClient = new Organizations({ region: "us-east-1" });
+    organizationsClient = new Organizations({ region: organizationsRegion });
   }
 
   console.log("Payload: %j", event);

src/organizational-unit-provider/on-event-handler.lambda.ts

@@ -2,6 +2,7 @@ import { CdkCustomResourceEvent as OnEventRequest, CdkCustomResourceResponse as
 import { AWSError, Organizations } from "aws-sdk";
 
 let organizationsClient: Organizations;
+const organizationsRegion = process.env.ORGANIZATIONS_ENDPOINT_REGION ?? "us-east-1";
 
 /**
  * The onEvent handler is invoked whenever a resource lifecycle event for an organizational unit occurs
@@ -12,7 +13,7 @@ export const handler = async (event: OnEventRequest): Promise<OnEventResponse> =
   console.log(`Request of type ${event.RequestType} received`);
 
   if (!organizationsClient) {
-    organizationsClient = new Organizations({ region: "us-east-1" });
+    organizationsClient = new Organizations({ region: organizationsRegion });
   }
 
   console.log("Payload: %j", event);

src/tag-resource-provider/on-event-handler.lambda.ts

@@ -2,6 +2,7 @@ import { CdkCustomResourceEvent as OnEventRequest, CdkCustomResourceResponse as
 import { Organizations } from "aws-sdk";
 
 let organizationsClient: Organizations;
+const organizationsRegion = process.env.ORGANIZATIONS_ENDPOINT_REGION ?? "us-east-1";
 
 /**
  * The onEvent handler is invoked whenever a resource lifecycle event for a TagResource occurs
@@ -12,7 +13,7 @@ export async function handler(event: OnEventRequest): Promise<OnEventResponse> {
   console.log(`Request of type ${event.RequestType} received`);
 
   if (!organizationsClient) {
-    organizationsClient = new Organizations({ region: "us-east-1" });
+    organizationsClient = new Organizations({ region: organizationsRegion });
   }
 
   console.log("Payload: %j", event);