chadtmiller.com/pds.js

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import { describe, expect, test } from 'vitest';
import {
  domainToLexiconDns,
  nsidToDomain,
  nsidToDomains,
} from '../src/authority.js';

describe('authority', () => {
  describe('nsidToDomain', () => {
    test('reverses every segment but the last, per spec', () => {
      expect(nsidToDomain('app.bsky.feed.post')).toBe('feed.bsky.app');
    });

    test('converts com.atproto.repo.createRecord to repo.atproto.com', () => {
      expect(nsidToDomain('com.atproto.repo.createRecord')).toBe(
        'repo.atproto.com',
      );
    });

    test('handles a two-segment authority', () => {
      expect(nsidToDomain('com.germnetwork.declaration')).toBe(
        'germnetwork.com',
      );
    });
  });

  describe('nsidToDomains', () => {
    test('offers the spec form first, then the two-segment fallback', () => {
      expect(nsidToDomains('app.bsky.feed.post')).toEqual([
        'feed.bsky.app',
        'bsky.app',
      ]);
    });

    test('does not repeat itself when the two forms coincide', () => {
      expect(nsidToDomains('com.germnetwork.declaration')).toEqual([
        'germnetwork.com',
      ]);
    });

    // com.atproto.lexicon.schema publishes only at lexicon.atproto.com, so the
    // two-segment form alone can't resolve it.
    test('reaches a deep authority that the short form misses', () => {
      expect(nsidToDomains('com.atproto.lexicon.schema')).toEqual([
        'lexicon.atproto.com',
        'atproto.com',
      ]);
    });
  });

  describe('domainToLexiconDns', () => {
    test('prepends _lexicon to domain', () => {
      expect(domainToLexiconDns('bsky.app')).toBe('_lexicon.bsky.app');
    });
  });
});