feat(hubspot): Implement generate auth url for OAuth

packages/backend/src/apps/hubspot/auth/generate-auth-url.ts

@@ -0,0 +1,21 @@
+import { IField, IGlobalVariable } from '@automatisch/types';
+import { URLSearchParams } from 'url';
+
+const scopes = ['crm.objects.contacts.read', 'crm.objects.contacts.write'];
+
+export default async function generateAuthUrl($: IGlobalVariable) {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field: IField) => field.key == 'oAuthRedirectUrl'
+  );
+  const callbackUrl = oauthRedirectUrlField.value as string;
+
+  const searchParams = new URLSearchParams({
+    client_id: $.auth.data.clientId as string,
+    redirect_uri: callbackUrl,
+    scope: scopes.join(' '),
+  });
+
+  const url = `https://app.hubspot.com/oauth/authorize?${searchParams.toString()}`;
+
+  await $.auth.set({ url });
+}