dag-json.js

import * as Signer from '@ucanto/principal/ed25519'
import { CAR } from '@ucanto/transport'
import * as CBOR from '@ucanto/transport/cbor'
import * as UcantoClient from '@ucanto/client'
import * as DAGJSON from '@ipld/dag-json'

const uploadService = await Signer.generate()
const alice = await Signer.generate()
const { proof, spaceDid } = await createSpace(alice)

const data = new Uint8Array([11, 22, 34, 44, 55])
const link = await CAR.codec.link(data)
const nb = { link, size: data.byteLength }
const can = 'store/add'

const request = await CAR.encode([
  {
    issuer: alice,
    audience: uploadService,
    capabilities: [{
      can,
      with: spaceDid,
      nb
    }],
    proofs: [proof],
  }
])

const car = await CAR.codec.decode(request.body)

console.log('car', car)

const dagCbor = await CBOR.codec.decode(car.roots[0].bytes)
const encodedDagJson = DAGJSON.encode(dagCbor)
const dagJson = DAGJSON.decode(encodedDagJson)

console.log('dagJson', JSON.stringify(dagJson))

/**
 * @param {Signer.EdSigner} audience
 */
async function createSpace (audience) {
  const space = await Signer.generate()
  const spaceDid = space.did()

  return {
    proof: await UcantoClient.delegate({
      issuer: space,
      audience,
      capabilities: [{ can: '*', with: spaceDid }]
    }),
    spaceDid
  }
}