cyberpirate92

public void ConfigureServices(IServiceCollection services)
{
    //...
    services.AddSingleton<GithubService>();
}

cyberpirate92

public class GithubService {
    private IHttpClientFactory httpClientFactory;
    private static string GITHUB_API_URL = "https://api.github.com";

    public GithubService(IHttpClientFactory clientFactory) {
        httpClientFactory = clientFactory;
    }

    public async Task<List<GithubRepository>> FetchUserRepositories(string username) {
        var repositories = new List<GithubRepository>();

cyberpirate92

@page "/"
@using TodoListApp.Data
@inject IJSRuntime JsRuntime;

<EditForm Model="@usernameFormModel" OnValidSubmit="@HandleValidSubmit">
    <DataAnnotationsValidator />
    <ValidationSummary />

    <InputText id="name" bind-Value="@usernameFormModel.Username" />
    <button type="submit">Fetch Repositories</button>

cyberpirate92

@page "/"
@using TodoListApp.Data

<EditForm Model="@usernameFormModel" OnValidSubmit="@HandleValidSubmit">
    <DataAnnotationsValidator />
    <ValidationSummary />

    <InputText id="name" bind-Value="@usernameFormModel.Username" />
    <button type="submit">Fetch Repositories</button>
</EditForm>

cyberpirate92

using System.ComponentModel.DataAnnotations;

public class UsernameFormModel
{
    [Required(AllowEmptyStrings = false)]
    [MinLength(3)]
    public string Username { get; set; }
}

cyberpirate92

Previous Block's hash                                             Timestamp     Nonce	  Transaction Data 
5FECEB66FFC86F38D952786C6D696C79C2DBC239DD4E91B46729D73A27FB57E9	1527709815253 511316	Hello 
00000BE462BE07F21AC57939DC46310322F8ACF170B1C16CC03E3DCC431A59BE	1527709815253	1362348	World 
00000E3D3CFFAEE5E8360EB8E7FF8AB39F270D39BCD5830A8505974632B98DC4	1527709815253 792204	Whatever 
Is valid chain : true 
Is valid chain : false

cyberpirate92

public static void main(String[] args) { 
  try { 
    var difficulty = 5; 
    var blockChain = new BlockChain(difficulty); 
    
    Block block1 = new Block("Hello"); 
    Block block2 = new Block("World"); 
    Block block3 = new Block("Whatever"); 
    
    blockChain.addBlock(block1); 

cyberpirate92

public boolean isValid() throws NoSuchAlgorithmException { 
  var pre = ""; 
  for(;pre.length() < difficulty; pre += "0"); 
  for (var i=1; i < chain.size(); ++i) { 
    var previousBlock = chain.get(i-1); 
    var currentBlock = chain.get(i); 
    if (!currentBlock.getHash().startsWith(pre) || !currentBlock.previousBlockHash.equals(previousBlock.getHash())) { 
      return false; 
    } 
  } 

cyberpirate92

public void addBlock(Block block) throws NoSuchAlgorithmException { 
  block.previousBlockHash = chain.size() == 0 ? CryptoHelper.sha256("0") : chain.get(chain.size()-1).getHash(); 
  
  // before adding a block to the blockchain 
  // mine block for the magic nonce value 
  block.mine(difficulty); 
  chain.add(block); 
}

cyberpirate92

public class BlockChain {
  
  public List<Block> chain; 
  private int difficulty;
  
  public BlockChain(int difficulty) { 
    chain = new ArrayList<>(); 
    this.difficulty = 
    difficulty; 
  }