Closes #37 (#109)

* change return value for new version of pubsub

* add support for the other bloomberg newsletters not only business

* add default fallback url if newsletter url not found

* revert pubsub version change

packages/inbound-email-handler/src/substack-handler.ts

@@ -1,10 +1,18 @@
 import { NewsletterHandler } from './newsletter'
+import addressparser from 'addressparser'
 
 export class SubstackHandler extends NewsletterHandler {
+  constructor() {
+    super()
+    this.defaultUrl = 'https://www.substack.com/'
+  }
+
   getNewsletterUrl(rawUrl: string, _html: string): string | undefined {
     // raw SubStack newsletter url is like <https://hongbo130.substack.com/p/tldr>
-    // we need to get the real url
-    return rawUrl.slice(1, -1)
+    // we need to get the real url from the raw url
+    return addressparser(rawUrl).length > 0
+      ? addressparser(rawUrl)[0].name
+      : undefined
   }
 
   isNewsletter(rawUrl: string, _from: string): boolean {