obernardovieira

$ mkdir -p some_dir/node1
$ cd some_dir/node1
$ geth - identity "my_private_net" - nodiscover - networkid 15 - datadir . init genesis.json
$ geth account new - datadir .
$ geth - mine - etherbase "result_hash_from_previous_command" -rpccorsdomain "*" - ipcpath ./geth.ipc - rpc - networkid 15 - datadir . -maxpeers 5 - minerthreads 1
# (new shell in the same directory)
$ geth - ipcpath ./geth.ipc - datadir . attach

obernardovieira

$ mkdir -p some_dir/node1
$ cd some_dir/node1
$ geth - identity "my_private_net" - nodiscover - networkid 15 - datadir . init genesis.json
$ geth account new - datadir .
$ geth - mine - etherbase "result_hash_from_previous_command" -rpccorsdomain "*" - ipcpath ./geth.ipc - rpc - networkid 15 - datadir . -maxpeers 5 - minerthreads 1 - port 30304 - rpcport 7545
# (new shell in the same directory)
$ geth - ipcpath ./geth.ipc - datadir . attach

obernardovieira

Keybase proof

I hereby claim:

• I am obernardovieira on github.
• I am obernardovieira (https://keybase.io/obernardovieira) on keybase.
• I have a public key ASD5ogeLJ_QgYIR4lWIam_zmeVbIjTXcZF5tUPOLx7wkYgo

To claim this, I am signing this object:

obernardovieira

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

obernardovieira

// List all files in a directory in Node.js recursively in a synchronous fashion
var walkSync = function(dir, filelist) {
  var fs = fs || require('fs'),
      files = fs.readdirSync(dir);
  filelist = filelist || [];
  files.forEach(function(file) {
    if (fs.statSync(dir + file).isDirectory()) {
      filelist = walkSync(dir + file + '/', filelist);
    }
    else {

obernardovieira

.

obernardovieira

did:muport:QmdE65oF2PsfbwZp4Ryw6KxEU7sMDGifbzygXxwHnRzevu

obernardovieira

public class App
{
   // change contract-address
   private static String contractAddress = contract-address;
   // main method
   public static void main(String[] args) {
       // instantiate web3j
       Web3j web3 = Web3j.build(new
          HttpService("http://localhost:9545/"));
       Credentials credentials = Credentials.create(wallet-address);

obernardovieira

Credentials credentials;
try {
  List<String> lines = Files.readAllLines(walletPathFile);
  credentials = WalletUtils.loadCredentials(walletPassword, new File(lines.get(0)));
} catch (IOException e) {
  String walletFile = WalletUtils.generateLightNewWalletFile(
          walletPassword, new File(WalletUtils.getDefaultKeyDirectory())
 );
  String walletFilePath = WalletUtils.getDefaultKeyDirectory() + "/" + walletFile;
  credentials = WalletUtils.loadCredentials(walletPassword, walletFilePath);

obernardovieira

const express = require('express')
const bodyParser = require('body-parser')
const ngrok = require('ngrok')
const decodeJWT = require('did-jwt').decodeJWT
const { Credentials } = require('uport-credentials')
const transports = require('uport-transports').transport
const message = require('uport-transports').message.util

let endpoint = ''
const app = express();