arweave-bundles

Arweave-Bundles (ANS-102)

This library contains routines to create, read, and verify Arweave bundled data.

See ANS-102 for more details.

Installing the library

You need to first have NodeJS and NPM installed. Then you can run:

npm install arweave-bundles

Initializing the library

This is a self-contained library, so we need to initialize the API with a couple of dependencies:

import Arweave from 'arweave';
import deepHash from 'arweave/node/lib/deepHash';
import ArweaveBundles from 'arweave-bundles';

const deps = {
  utils: Arweave.utils,
  crypto: Arweave.crypto,
  deepHash: deepHash,
}

const arBundles = ArweaveBundles(deps);

Unbundling from a Transaction containing DataItems

const txData = myTx.get('data', { decode: true, string: true });

// Will extract and verify items, returning an array of valid 
// DataItems.
const items = await ArweaveBundles.unbundleData(txData);

Reading data and tags from a DataItem

const item = items[1]; // get a single item out of the array returned in the previous step.

// get data as Uint8Array.
const data = await arBundles.decodeData(item, { string: false });
// get data as utf8 string.
const data = await arBundles.decodeData(item, { string: true });

// get id, owner, target, signature, nonce
const id = item.id
const owner = item.owner
const target = item.taget
const signature = item.signature
const nonce = item.none


for (let i = 0; i < item.tags.length; i++) {
  const tag = await arBundles.decodeTag(item.tag)
  // tag.name
  // tag.value
}

Creating a DataItem

const myTags = [
  { name: 'App-Name', value: 'myApp' },
  { name: 'App-Version', value: '1.0.0' }
];

let item = await arBundles.createData({ to: 'awalleet', data: 'somemessage', tags: myTags }, wallet);

// Add some more tags after creation.
arBundles.addTag(item, 'MyTag', 'value1');
arBundles.addTag(item, 'MyTag', 'value2');

// Sign the data, ready to be added to a bundle
data = await arBundles.sign(item, wallet);

Bundling up DataItems and writing a transaction

const items = await makeManyDataItems();

// Will ensure all items are valid and have been signed,
// throwing if any are not
const myBundle = await arBundles.bundleData(items);

const myTx = await arweave.createTransaction({ data: myBundle }, wallet);

myTx.addTag('Bundle-Format', 'json');
myTx.addTag('Bundle-Version', '1.0.0');
myTx.addTag('Content-Type', 'application/json');

await arweave.transactions.sign(tx, wallet);
await arweave.transactions.post(tx);