bitcoinfilesjs

bitcoinfilesjs is a JavaScript Library for building transactions for Bitcoin Files Protocol (BFP). Methods for uploading and downloading files are provided per the BFP specification. For convenience, BITBOX network functionality has been built into the library.

Other tools using the Bitcoin Files Protocol include:

• Electron Cash SLP Edition
• BitcoinFiles.com

Installation

For node.js

npm install bitcoinfiles

For browser

<script src='https://unpkg.com/bitcoinfiles'></script>

Example File Download

const bfp = require('bitcoinfiles').bfp;

// 1 - download file using URI
let result;
(async function(){
    result = await bfp.downloadFile('bitcoinfile:7e4600323c934926369c136562f5483e3df79baf087c8dd2b0ed1aea69d5ee49');
    console.log("download complete.");
})();

// Wait for download to complete -- Mario.png TAKES ABOUT 6 SEC TO DOWNLOAD!

// 2 - result includes a boolean check telling you if the file's sha256 matches the file's metadata```
if(result.passesHashCheck){
    console.log("Success: downloaded file sha256 matches file's metadata");
}

// 3 - do something with the file...
let fileBuffer = result.fileBuf;

Example File Upload

Below is a simple example. For a more complete React.js file upload example visit SimpleToken.cash website

const bfp = require('bitcoinfiles').bfp;
const network = require('bitcoinfiles').network;
const BITBOX = require('bitcoinfiles').bitbox;

// 1 - get a file and file metadata somehow 
const someFileBuffer = new Buffer.from('aabbccddeeff', 'hex');
const fileName = 'a test file';
const fileExt = 'txt';
const fileSize = someFileBuffer.length
const fileSha256Hex = BITBOX.Crypto.sha256(someFileBuffer).toString('hex');

// 2 - estimate upload cost for funding the transaction
let config = {
    msgType: 1,
    chunkCount: 1,
    fileName: fileName,
    fileExt: fileExt,
    fileSize: fileSize,
    fileSha256Hex: fileSha256Hex,
    prevFileSha256Hex: null,
    fileUri: null,
    chunkData: null  // chunk not needed for cost estimate stage
};
let uploadCost = bfp.calculateFileUploadCost(fileSize, config);
console.log(uploadCost);

// 3 - create a funding transaction
let fundingAddress = 'bitcoincash:qqgvrkm0xpmwqgyhfm65qxv70tjtwma6lgk07ffv9u'
let fundingWif = 'KzcuA9xnDRrb9cPh29N7EQbBhQQLMWtcrDwKbEMoahmwBNACNRfa'

// 4 - Make sure address above is funded with the amount equal to the uploadCost
let fundingUtxo;
(async function(){
    let txos = await network.getUtxoWithRetry(fundingAddress);
    fundingUtxo = txos[txos.length-1]; // UTXOs are sorted small to large, so grab biggest one to be conservative.
    console.log('got funding Utxo.')
})();

// wait for network to resolve...

// 5 - upload the file
let fileId;
(async function(){
 fileId = await bfp.uploadFile(fundingUtxo, fundingAddress, fundingWif, someFileBuffer, fileName, fileExt);
 console.log(fileId);
})(); 

// wait for upload to complete resolve... Done.