andrewkleinonlineckb / denames

Denames

• Installing Denames
• Using Denames
• Default Ethereum Providers
• Error Handling
• Free advertising for integrated apps

Denames is a library for interacting with blockchain accounts and domains. It can be used to retrieve crypto addresses on blockchain, users social contacts and custom records.

Denames supports decentralized accounts/domains across below zones:

• Decentralized Account Systems(DAS)

  • .bit

• Zilliqa Name Service (ZNS)

  • .zil

• Ethereum Name Service (ENS)

  • .eth
  • .kred
  • .xyz
  • .luxe

• Unstoppable Name Service (UNS)

  • .crypto
  • .nft
  • .blockchain
  • .bitcoin
  • .coin
  • .wallet
  • .888
  • .dao
  • .x
  • ...

Background

The Denames is currently built on top of @unstoppabledomain/resolution version v5.0.1, and added support for DAS alongside with ENS, UNS, ZNS.

Denames introduced a method which will return a list of crypto addresses for the given chain:

import { Resolution } from 'denames'

const resolution = new Resolution()
const account = 'dastodamoon.bit'

interface DasAccountRecord {
  ttl: number; // This will always be 0 for all accounts other than DAS
  avatar: string; // This will always be empty string `''` for all accounts other than DAS
  key: string; // This will always be the corresponding key for each account systems
  label: string; // This will always be empty string `''` for all accounts other than DAS
  value: string;
}

resolution.addrList(account, 'ckb').then(records => {
  console.log(`account ${account} has ${records.length} CKB address records as below:`)
  
  records.forEach((record: DasAccountRecord, i) => {
    const { key, value, label, ttl, avatar } = record
    console.log(`CKB address ${i}: ${value}, label: ${label}, with a ttl ${ttl}`)
  })
})

output:

account dastodamoon.bit has 2 CKB address records as below:
CKB address 0: ckb1qyqzeajw8xtqgvw0d6q8ey7sysvv7evxvwqqvnvmwu, label: BusinessAddress, with a ttl 300
CKB address 1: ckb1qyq9j48k60dll8xjw04u2uu6vvd0fypqjkhqq84pmt, label: PersonalAddress, with a ttl 300

It will return an empty list [] when no records are set.

For other methods from @unstoppabledomain/resolution, please see @unstoppabledomains/resolution API Reference

Installing Denames

Denames can be installed with either yarn or npm.

yarn add denames

npm install denames

If you're interested in resolving domains via the command line, see our CLI section.

Using Denames

Create a new project.

mkdir denames && cd $_
yarn init -y
yarn add denames

Look up account's crypto addresses

Create a new file in your project, address.js.

It is recommended that developers set up their own DAS Indexer, see das-sdk-js for details.

const { Resolution } = require('denames');
const resolution = new Resolution({
  sourceConfig: {
    das: {
      url: 'https://indexer.da.systems', // DAS indexer JSON-RPC endpoint. You can use the indexer provided by DAS team for test.
      network: 'mainnet',
    }
  }
});

function resolve(domain, currency) {
  resolution
    .addrList(domain, currency)
    .then((records) => console.log(domain, 'resolves to', records[0]?.value))
    .catch(console.error);
}

resolve('dastodamoon.bit', 'CKB');
resolve('brad.zil', 'ZIL');

Execute the script.

$ node address.js
dastodamoon.bit resolves to ckb1qyqzeajw8xtqgvw0d6q8ey7sysvv7evxvwqqvnvmwu
brad.zil resolves to zil1yu5u4hegy9v3xgluweg4en54zm8f8auwxu0xxj

Command Line Interface

To use denames via the command line install the package globally.

yarn global add denames

npm install -g denames

By default, the CLI uses Infura as its primary gateway to the Ethereum blockchain. If you'd like to override this default and set another provider you can do so using the --ethereum-url flag.

For example:

denames --ethereum-url https://mainnet.infura.io/v3/${secret} -d udtestdev-usdt.crypto -a

Use the -h or --help flag to see all the available CLI options.

Default Ethereum Providers

Denames provides zero-configuration experience by using built-in production-ready Infura endpoint by default.
Default Ethereum provider is free to use without restrictions and rate-limits for CNS (.crypto domains) resolution.
To resolve ENS domains on production it's recommended to change Ethereum provider.
Default provider can be changed by changing constructor options new Resolution(options) or by using one of the factory methods:

• Resolution.infura()
• Resolution.fromWeb3Version1Provider()
• Resolution.fromEthersProvider()
• etc.

To see all constructor options and factory methods check Unstoppable API reference.

Autoconfiguration of blockchain network

In some scenarios system might not be flexible enough to easy distinguish between various Ethereum testnets on compile time. For this case Denames library provide a special async constructor which should be waited for await Resolution.autonetwork(options). This method makes a JSON RPC "net_version" call to the provider to get the network id.

This method configures only Ens and Cns, Zns is supported only on Zilliqa mainnet which is going to be used in any cases. You can provide a configured provider or a blockchain url as in the following example:

await Resolution.autonetwork({
  cns: {provider},
  ens: {url}
});

Error Handling

When denames encounters an error it returns the error code instead of stopping the process. Keep an eye out for return values like RECORD_NOT_FOUND.

Development

Use these commands to set up a local development environment (macOS Terminal or Linux shell).

1. Install nvm

   curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.36.0/install.sh | bash

2. Install concrete version of node.js

   nvm install 12.12.0

3. Install yarn

   npm install -g yarn

4. Clone the repository

   git clone https://github.com/DeAccountSystems/denames.git
   cd denames

5. Install dependencies

   yarn install

Internal config

To update:

• Network config: $ yarn network-config:pull
• Supported keys: $ yarn supported-keys:pull
• Both configs: $ yarn config:pull

Get help

Join our discord community and ask questions.