Vaporized

Vapor Daemon

Vaporized is the reference implementation of a Vapor server.

It is powered by express.js and should be familiar to any web developer with express.js experience.

Quickstart

1. Clone the vapor-starfish project to start a Vapor server
2. Visit http://localhost:3006 to get started.
3. If this is your first time, you will be directed to install Starfish, which is a Bitcoin wallet implementation that supports Vapor.

Install

npm install --save vaporized

Usage

A. Server

1. Initialize

Initialize a Vapor object:

const Vapor = require('vaporized')
const vapor = new Vapor({
  store: <THE ROOT PATH WHERE VAPOR STORES TRANSACTIONS AND KEYS>,
  port: <HTTP PORT TO LISTEN TO>,
  parse: <A PARSE FUNCTION FOR TRANSACTIONS>
})

The vapor object has the following attributes:

• app: The express app object
• express: The express object
• bitcoin: The Vapor request handler

2. Building the Web Service

Using the built-in express.js engine, you can build your web UI. Example:

const Vapor = require('vaporized')
const { app, bitcoin } = new Vapor()
app.set('view engine', 'ejs')
app.engine('ejs', require('ejs').__express)
app.set('views', path.resolve(process.cwd(), './views'));
app.use(express.static(path.join(process.cwd(), './public')))
app.get("/", (req, res) => {
  res.render("index")
})
app.get("/files/:txid", (req, res) => {
  fs.createReadStream(store + "/files/" + req.params.txid).pipe(res)
})

3. Building the Bitcoin Service

Vapor works by wrapping HTTP requests in a Bitcoin transaction following a protocol.

The system provides an effortless way to handle Bitcoinized HTTP requests

It provides a set of request handlers that make it trivial thandle the Bitcoinized HTTP requests in a familiar manner:

const Vapor = require('vaporized')
const { app, bitcoin } = new Vapor()
bitcoin.post("/posts", (req, res, data, tx) => {
  /***************************************************************************
  * 
  * req  := <The express.js req object>
  *
  * res  := <The express.js res object>
  *
  * data := {
  *   id: '4f3cb2b85d59a7360f6228cb968c43346b4178a778689986e1d4eaed194412e6',   // Wrapper transaction id
  *   header: {
  *     address: '1qDymcCUGDNwWYzVfoJwh91p7wLLiLgon',                           // User identity
  *     ts: 1604484364603
  *   },
  *   timestamp: 1604484364614,                                                 // Server-side timestamp
  *   request: {
  *     version: '1',                                                           // Protocol version
  *     host: '1BJnZBCm4qLTNjg6Z5hrU3SjB9FWetN8CA',                             // Server identity
  *     method: 'post',                                                         // Request method
  *     resource: '/message',                                                   // Request path
  *     body: <Buffer 7b 22 6d 65 73 73 61 67 65 22 68 65 72 65 22 7d>          // Request payload in Buffer
  *   }
  * }
  *
  * tx   := <The Bitcoin transaction object that wraps the Vapor request>
  *
  ****************************************************************************/
  let body = data.request.body.toString()
  res.json({ id: data.id, body: body })
})

4. Read API

Using the app obejct you can implement as many "Read" APIs as you want. But Vapor also ships with 2 default APIs:

• chain.query(): query the chain
• chain.tx(): get raw transaction hex

query()

const Vapor = require('vaporized')
const { chain } = new Vapor()
chain.query({
  find: {
    ts: { $gt: 1604514885559 }
  },
  sort: {
    ts: -1
  },
  limit: 10
}).then((transactions) => {
  console.log("transactions = ", transactions)
})

tx()

const Vapor = require('vaporized')
const { chain } = new Vapor()
chain.tx("e7ba555961fdb793165f2c9daac5f5885536aaf07d7cebb73f74617b059d3eb8")
		 .pipe(process.stdout)

The tx() API is also available as a web endpoint at /rawtx/:txid (example: http://localhost:3006/rawtx/e7ba555961fdb793165f2c9daac5f5885536aaf07d7cebb73f74617b059d3eb8)

B. Client

There are 2 options to posting data to a Vapor endpoint:

1. Post JSON

Initialize a vapor object with a Bitcoin wallet (Default wallet: Starfish) and post to it.

<html>
<body>
<script src="https://unpkg.com/vaporize"></script>
<script>
  const vapor = new Vapor()
  vapor.post("/posts", { text: e.target.value }).then((response) => {
    console.log("response = ", response)
  })
</script>
</body>
</html>

2. Post ArrayBuffer

<html>
<body>
<script src="https://unpkg.com/vaporize"></script>
<script>
  const vapor = new Vapor()
  const arrayBuffer = new TextEncoder().encode("Hello World").buffer
  vapor.post("/files", arrayBuffer).then((response) => {
    console.log("response = ", response)
  })
</script>
</body>
</html>

This can be used to upload binary:

<html>
<body>
<script src="https://unpkg.com/vaporize"></script>
<script>
  const vapor = new Vapor()
  document.querySelector("#upload").addEventListener("change", async (e) => {
    let reader = new FileReader();
    reader.onloadend = async () => {
      const response = await vapor.post("/files", reader.result)
      console.log("response = ", response)
    };
    reader.readAsArrayBuffer(e.target.files[0]);
  })
</script>
</body>
</html>