[MOB-5933]: EU Domain Configuration (#199)

* temp

* add env var to hit EU service

* remove test changes

* update naming and comments

* update env example value name

---------

Co-authored-by: mitch prewitt <[email protected]>

Author: mprew97

.env.example

@@ -2,5 +2,10 @@
 # called .env and add these values to it and change them appropriately.
 # Remember to uncomment the variables!
 
+# Only set BASE_URL if developing locally, as it will take precedence over the production api urls
 # BASE_URL="https://api.iterable.com/api"
+
 # ENABLE_INAPP_CONSUME=false
+
+# toggle this to true if you would need to hit our EU APIs
+# IS_EU_ITERABLE_SERVICE=false

src/constants.ts

@@ -4,7 +4,19 @@ export const DISPLAY_INTERVAL_DEFAULT = 30000;
 /* how many times we try to create a new user when _setUserID_ is invoked */
 export const RETRY_USER_ATTEMPTS = 0;
 
-export const BASE_URL = process.env.BASE_URL || 'https://api.iterable.com/api';
+const IS_EU_ITERABLE_SERVICE =
+  process.env.IS_EU_ITERABLE_SERVICE === 'true' ? true : false;
+
+const US_ITERABLE_DOMAIN = 'api.iterable.com';
+
+const EU_ITERABLE_DOMAIN = 'api.eu.iterable.com';
+
+const ITERABLE_API_URL = `https://${
+  IS_EU_ITERABLE_SERVICE ? EU_ITERABLE_DOMAIN : US_ITERABLE_DOMAIN
+}/api`;
+
+// Do not set `process.env.BASE_URL` if intending on using the prod or EU APIs.
+export const BASE_URL = process.env.BASE_URL || ITERABLE_API_URL;
 
 export const GETMESSAGES_PATH = '/inApp/web/getMessages';