Visualise a delegation

delegation-vis.js

import fs from 'node:fs'
import { Readable } from 'node:stream'
import { CARReaderStream } from 'carstream'
import * as dagCBOR from '@ipld/dag-cbor'
import * as dagJSON from '@ipld/dag-json'
import * as DID from '@ipld/dag-ucan/did'

Readable.toWeb(fs.createReadStream('proof.car'))
  .pipeThrough(new CARReaderStream())
  .pipeTo(new WritableStream({
    write (block) {
      console.log(block.cid.toString())
      const obj = dagCBOR.decode(block.bytes)
      if (obj.iss) {
        obj.iss = DID.decode(obj.iss).did()
      }
      if (obj.aud) {
        obj.aud = DID.decode(obj.aud).did()
      }
      console.log(JSON.stringify(JSON.parse(dagJSON.format(obj)), null, 2))
      console.log('===')
    }
  }))