Store hotlink access token hash on upload for short URL lookup.

backend/src/utils/hashHotlinkAccessToken.spec.ts

@@ -0,0 +1,12 @@
+import { createHash } from 'node:crypto';
+import { hashHotlinkAccessToken } from './hashHotlinkAccessToken';
+
+describe('hashHotlinkAccessToken', () => {
+    it('matches sha256 hex digest of the utf8 access token string', () => {
+        const accessToken = 'test-hotlink-access-token_base64url';
+
+        expect(hashHotlinkAccessToken(accessToken)).toBe(
+            createHash('sha256').update(accessToken, 'utf8').digest('hex')
+        );
+    });
+});