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@kctam
Created March 28, 2019 09:45
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'use strict';
const { FileSystemWallet, Gateway } = require('fabric-network');
const fs = require('fs');
const path = require('path');
const { KJUR, KEYUTIL } = require('jsrsasign');
const CryptoJS = require('crypto-js');
const ccpPath = path.resolve(__dirname, '..', 'basic-network', 'connection.json');
const ccpJSON = fs.readFileSync(ccpPath, 'utf8');
const ccp = JSON.parse(ccpJSON);
async function main() {
try {
// Create a new file system based wallet for managing identities.
const walletPath = path.join(process.cwd(), 'wallet');
const wallet = new FileSystemWallet(walletPath);
// Collect input parameters
// user: who initiates this query, can be anyone in the wallet
// filename: the file to be validated
const user = process.argv[2];
const filename = process.argv[3];
// Check to see if we've already enrolled the user.
const userExists = await wallet.exists(user);
if (!userExists) {
console.log('An identity for the user ' + user + ' does not exist in the wallet');
console.log('Run the registerUser.js application before retrying');
return;
}
// calculate Hash from the specified file
const fileLoaded = fs.readFileSync(filename, 'utf8');
var hashToAction = CryptoJS.SHA256(fileLoaded).toString();
console.log("Hash of the file: " + hashToAction);
// extract certificate info from wallet
const walletContents = await wallet.export(user);
const userPrivateKey = walletContents.privateKey;
var sig = new KJUR.crypto.Signature({"alg": "SHA256withECDSA"});
sig.init(userPrivateKey, "");
sig.updateHex(hashToAction);
var sigValueHex = sig.sign();
var sigValueBase64 = new Buffer(sigValueHex, 'hex').toString('base64');
console.log("Signature: " + sigValueBase64);
// Create a new gateway for connecting to our peer node.
const gateway = new Gateway();
await gateway.connect(ccp, { wallet, identity: user, discovery: { enabled: false } });
// Get the network (channel) our contract is deployed to.
const network = await gateway.getNetwork('mychannel');
// Get the contract from the network.
const contract = network.getContract('docrec');
// Submit the specified transaction.
await contract.submitTransaction('createDocRecord', hashToAction, sigValueBase64);
console.log('Transaction has been submitted');
// Disconnect from the gateway.
await gateway.disconnect();
} catch (error) {
console.error(`Failed to submit transaction: ${error}`);
process.exit(1);
}
}
main();
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