chadtmiller.com/pds.js

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import { describe, expect, it } from 'vitest';
import {
  CID,
  cborDecodeJson,
  cborEncodeDagCbor,
  cidToBytes,
  jsonToLex,
  lexToJson,
} from '../src/repo.js';

const LINK = 'bafyreidefdycgbfy3oglcb6ism3eqhyp5llsrpzxjsuac2gsy4mtrtx244';

describe('jsonToLex and lexToJson', () => {
  const json = {
    $type: 'com.example.post',
    image: {
      $type: 'blob',
      ref: { $link: LINK },
      mimeType: 'image/png',
      size: 3,
    },
    raw: { $bytes: 'AQID' },
    list: [{ $link: LINK }, 1, 'x', null, true],
    // Not a link: a second key.
    notLink: { $link: LINK, other: 1 },
  };

  it('stores a link as tag 42 and bytes as a byte string', () => {
    const lex = /** @type {any} */ (jsonToLex(json));
    expect(lex.image.ref).toBeInstanceOf(CID);
    expect(lex.image.ref.bytes).toEqual(cidToBytes(LINK));
    expect(lex.raw).toEqual(new Uint8Array([1, 2, 3]));
    expect(lex.list[0]).toBeInstanceOf(CID);
    expect(lex.notLink).toEqual({ $link: LINK, other: 1 });
    const bytes = cborEncodeDagCbor(lex);
    // d8 2a: tag 42.
    expect(Buffer.from(bytes).includes(Buffer.from([0xd8, 0x2a]))).toBe(true);
  });

  it('round-trips through storage', () => {
    expect(cborDecodeJson(cborEncodeDagCbor(jsonToLex(json)))).toEqual(json);
  });

  it('leaves plain JSON alone', () => {
    const plain = { a: [1, { b: 'c' }], d: null };
    expect(jsonToLex(plain)).toEqual(plain);
    expect(lexToJson(plain)).toEqual(plain);
  });
});