Solidity JSON data storage

Note: React demo UI may not work at the moment !!!

Abstract

This repository contains Solidity and JavaScript libraries which enables storage and processing of JSON-like data structures on chain. It can be used as universal data storage for many use cases.

Features

• [x] Support JSON parsing and storage
  Smart contracts can parse simple JSON data. Arbitrary quantity of key:value pairs. Dynamic values length. At the moment, values can be only strings but not binary (hex) or nested data structure.

• [x] On chain access to data structure
  Logic smart contracts build on top of Storage contract can operate key and values of JSON data in it.

• [x] Security and versioning with per-entry granularity
  Each JSON entry in Storage contract is bound to its specific Logic Smart Sontract or account address with exclusive permissions to modify the entry or switch ot other Logic address

Usage

Save JSON to Storage contract

...
const { jsonToEth, ethToJson } = require ('./utils');

const jsonData = JSON.stringify({
  someKey1: 'some value 1',
  someKey2: 'some value 2',
  someKey3: 'some value 3',
});

// data entry id
const id = '0x' + crypto.randomBytes(32).toString('hex');
// smart contract or account address, which is responsible for business logic for this entry
const address = '0x120f5E67e56dECfc3C635BAAbd99446167320152'; 

await storage.methods.set(id, ...jsonToEth(jsonData), address).send({ from: address });
...

Get JSON from Storage contract

const { jsonToEth, ethToJson } = require ('./utils');

const ethDataFromContract = await storage.methods.get(id).call();
const jsonDataFromContract = ethToJson(ethDataFromContract);

Add/update/delete key value inside Storage contract

const { jsonToEth, ethToJson } = require ('./utils');

// data entry id, which should exist in Storage contract
const id = '0x6af14e3c125e2528f0e0b6f554c408796a606f81b22f046ca7b8e6400156714b'
// smart contract or account address, which is responsible for business logic for this entry
const address = '0x120f5E67e56dECfc3C635BAAbd99446167320152'; 

let keyName = Web3.utils.stringToHex('keyName');
let keyValue = Web3.utils.stringToHex('key value');
await storage.methods.setByDataKey(id, keyName, keyValue).send({ from: address });

keyValue = Web3.utils.stringToHex('new key value');
await storage.methods.setByDataKey(id, keyName, keyValue).send({ from: address });

await storage.methods.removeByDataKey(id, keyName).send({ from: address });

Check example.js for more details

Roadmap

• [ ] Convenient wrappers of Contract abstractions and methods.
• [ ] Hex data types for values
• [ ] Data structure nesting