orbit-db-access-controllers/src/access-controllers/ipfs.js

Access Controllers for OrbitDB

import * as io from '../utils/index.js'
import AccessController from './interface.js'
const type = 'ipfs'

export default class IPFSAccessController extends AccessController {
  constructor (ipfs, options) {
    super()
    this._ipfs = ipfs
    this._write = Array.from(options.write || [])
  }

  // Returns the type of the access controller
  static get type () { return type }

  // Return a Set of keys that have `access` capability
  get write () {
    return this._write
  }

  async canAppend (entry, identityProvider) {
    // Allow if access list contain the writer's publicKey or is '*'
    const key = entry.identity.id
    if (this.write.includes(key) || this.write.includes('*')) {
      // check identity is valid
      return identityProvider.verifyIdentity(entry.identity)
    }
    return false
  }

  async load (address) {
    // Transform '/ipfs/QmPFtHi3cmfZerxtH9ySLdzpg1yFhocYDZgEZywdUXHxFU'
    // to 'QmPFtHi3cmfZerxtH9ySLdzpg1yFhocYDZgEZywdUXHxFU'
    if (address.indexOf('/ipfs') === 0) { address = address.split('/')[2] }

    try {
      this._write = await io.read(this._ipfs, address)
    } catch (e) {
      console.log('IPFSAccessController.load ERROR:', e)
    }
  }

  async save () {
    let cid
    try {
      cid = await io.write(this._ipfs, 'dag-cbor', { write: JSON.stringify(this.write, null, 2) })
    } catch (e) {
      console.log('IPFSAccessController.save ERROR:', e)
    }
    // return the manifest data
    return { address: cid }
  }

  static async create (orbitdb, options = {}) {
    options = { ...options, ...{ write: options.write || [orbitdb.identity.id] } }
    return new IPFSAccessController(orbitdb._ipfs, options)
  }
}