@pando/git-remote-pando/src/lib/ipld.ts

git-remote-helper for pando

import CID from 'cids'
import IPFS from 'ipfs-http-client'
import IPLD from 'ipld'
import IPLDGit from 'ipld-git'
// tslint:disable-next-line:no-submodule-imports
import { cidToSha, shaToCid } from 'ipld-git/src/util/util'
import URL from 'url-parse'
import Helper from '../helper'

export default class IPLDHelper {
  public helper: Helper
  private _ipfs: IPFS
  private _ipld: IPLD

  // OK
  constructor(helper: Helper) {
    const url = new URL(helper.config.ipfs.gateway)
    this.helper = helper
    this._ipfs = IPFS({ host: url.hostname, port: url.port, protocol: url.protocol.slice(0, url.protocol.length - 1) })
    this._ipld = new IPLD({
      blockService: this._ipfs.block,
      formats: [IPLDGit],
    })
  }

  // OK
  public async deserialize(buffer: Buffer): Promise<any> {
    return new Promise<any>((resolve, reject) => {
      IPLDGit.util.deserialize(buffer, (err, node) => {
        if (err) {
          reject(err)
        } else {
          resolve(node)
        }
      })
    })
  }

  // OK
  public async serialize(node: any): Promise<Buffer> {
    return new Promise<Buffer>((resolve, reject) => {
      IPLDGit.util.serialize(node, async (err, buffer) => {
        if (err) {
          reject(err)
        } else {
          resolve(buffer)
        }
      })
    })
  }

  // OK
  public async put(object: any): Promise<any> {
    return new Promise<any>((resolve, reject) => {
      this._ipld.put(object, { format: 'git-raw' }, (err, cid) => {
        if (err) {
          reject(err)
        } else {
          resolve(cid)
        }
      })
    })
  }

  // OK
  public async get(cid: string): Promise<any> {
    return new Promise<any>((resolve, reject) => {
      this._ipld.get(new CID(cid), (err, result) => {
        if (err) {
          reject(err)
        } else {
          resolve(result.value)
        }
      })
    })
  }

  // OK
  public async pin(cid: string): Promise<void> {
    return this._ipfs.pin.add(cid)
  }

  // OK
  public async cid(object: any): Promise<any> {
    return new Promise<any>((resolve, reject) => {
      this._ipld.put(object, { format: 'git-raw', onlyHash: true }, (err, cid) => {
        if (err) {
          reject(err)
        } else {
          resolve(cid.toBaseEncodedString())
        }
      })
    })
  }

  // OK
  public shaToCid(oid: string): string {
    return new CID(shaToCid(Buffer.from(oid, 'hex'))).toBaseEncodedString()
  }

  // OK
  public cidToSha(cid: string): string {
    return cidToSha(new CID(cid)).toString('hex')
  }
}