Skip to main content

Part-4 |Blazor WebAssembly[.NET 7] JWT Authentication Series | Implement Refresh Token & User Logout

The main objectives  of this article are:
  • Implement Refresh Token
  • User Logout

Refresh Token:

When the JWT access token expires to renew it without user credentials we will use the Refresh Token.
  • The user sends a valid 'User Name' and 'Password' to the server, then the server will generate JWT Access Token and Refresh Token sent as a response.
  • The JWT Access Token is a short-lived token(eg: 20 minutes) and Refresh Token is a long live token(eg: 7 days).
  • Now client application sends a JWT access token in the request header that makes the user authenticated.
  • If the JWT token expires then the server returns a 401 authorized response.
  • Then the client sends the refresh token to the server to regenerate the JWT Access Token. The server validates the refresh token and returns a new JWT Access Token and a new Refresh Token as a response.

SQL Script To Create UserRefreshToken Table:

Let's run the below sql script to create 'UserRefreshToken' table that contains columns like 'Token', 'UserId', and 'ExpirationDate'.
CREATE TABLE [dbo].[UserRefreshToken](
	[Id]  INT IDENTITY(1,1) NOT NULL,
	[Token] VARCHAR(100) NOT NULL,
	[UserId] INT NOT NULL,
	[ExpirationDate] DATETIME NOT NULL
	CONSTRAINT PK_UserRefreshToken PRIMARY KEY (Id)
)

Refresh Token In Login Endpoint Response:

Let's implement a refresh token as a login endpoint response.

In 'UserService.cs' add a private method like 'GenerateRefreshToken()'.
API_Project/Services/UserServices.cs:
private async Task<string> GenerateRefreshToken(int userId)
{
	byte[] bytetoken = new byte[32];
	using (var randomGenerator = RandomNumberGenerator.Create())
	{
		randomGenerator.GetBytes(bytetoken);
	}
	var token = Convert.ToBase64String(bytetoken);
	var newRefreshToken = new UserRefreshToken
	{
		UserId = userId,
		Token = token,
		ExpirationDate = DateTime.UtcNow.AddDays(3),
	};
	_dbContext.UserRefreshToken.Add(newRefreshToken);
	await _dbContext.SaveChangesAsync();
	return token;
}
  • (Line: 3-8) Generated the random string which we use as a refresh token.
  • (Line: 9-16) Saving the refresh token in the database along with expiration and user id value.
Now update the 'JWTTokenResponseDto' as below.
API_Project/Dtos/JWTTokenResponseDto.cs:
namespace JWT.Auth.BlazorUI.ViewModels.Account
{
    public class JWTTokenResponseVM
    {
        public string AccessToken { get; set; }
        public string RefreshToken { get; set; }
    }
}
  • Added 'RefreshToken' property.
Now consume the 'GenerateRefreshToken()' in the 'LoginAsync()' method.
API_Project/Services/UserServices.cs:
public async Task<(bool IsLoginSucess, JWTTokenResponseDto TokenResponse)> LoginAsync(LoginDto loginpayload)
{

	if (string.IsNullOrEmpty(loginpayload.Email) ||
		string.IsNullOrEmpty(loginpayload.Password))
	{
		return (false, null);
	}

	var user = await _dbContext.User.Where(_ => _.Email.ToLower() == loginpayload.Email.ToLower())
		.FirstOrDefaultAsync();

	if (user == null) { return (false, null); }

	bool validUserPassowrd = PasswordVerification(loginpayload.Password, user.Password);
	if (!validUserPassowrd) { return (false, null); }

	string jwtAccessToken = GenerateJwtAccessToken(user);
	string refreshToken = await GenerateRefreshToken(user.Id);
	var result = new JWTTokenResponseDto
	{
		AccessToken = jwtAccessToken,
		RefreshToken = refreshToken,
	};

	return (true, result);
}
  • (Line: 19) Fetching the Refresh Token

Store Refresh Token In Browser LocalStorage:

Let's update the 'JWTTokenResponseVm' as below.
BlazorWasm_App/ViewModels/Account/JWTTokenResponseVm.cs:
namespace JWT.Auth.BlazorUI.ViewModels.Account
{
    public class JWTTokenResponseVM
    {
        public string AccessToken { get; set; }
        public string RefreshToken { get; set; }
    }
}
  • Add the 'RefreshToken' property.
Now in 'Login.razor' component update as below.
BlazorWasm_App/Pages/Account/Login.razor:(LoginAsync method) 
else if (response.StatusCode == System.Net.HttpStatusCode.OK)
{
	var tokenResponse = await response.Content.ReadFromJsonAsync<JWTTokenResponseVM>();
	await _localStorageService.SetItemAsync<string>("jwt-access-token", tokenResponse.AccessToken);
	await _localStorageService.SetItemAsync<string>("refresh-token",tokenResponse.RefreshToken);
	(_authStateProvider as CustomAuthProvider).NotifyAuthState();
	_navigationManager.NavigateTo("/fetchdata");
}
  • (Line: 5) Saving refresh token value to browser local storage.

Implement Refresh Token Endpoint:

Let's create a new request object like 'RenewTokenRequestDto.cs'.
API_Project/Dtos/RenewTokenRequestDto.cs:
namespace JWT.Auth.API.Dtos
{
    public class RenewTokenRequestDto
    {
        public int UserId { get; set; }
        public string RefreshToken { get; set; }
    }
}
  • Here is our payload object for the refresh token endpoint.
In 'IUserService' let's define the following method definition.
API_Project/Services/IUserService.cs:
Task<(string ErrorsMessage, JWTTokenResponseDto JWTTokenResponse)> RenewTokenAsync(RenewTokenRequestDto renewTokenRequest);
In 'UserService' let's implement the following method.
API_Project/Services/UserService.cs:
public async Task<(string ErrorsMessage,JWTTokenResponseDto JWTTokenResponse)> RenewTokenAsync(RenewTokenRequestDto renewTokenRequest)
{
	var existingRefreshToken = await _dbContext.UserRefreshToken
		.Where(_ => _.UserId == renewTokenRequest.UserId
		&& _.Token == renewTokenRequest.RefreshToken &&
		_.ExpirationDate > DateTime.Now).FirstOrDefaultAsync();

	if(existingRefreshToken == null)
	{
		return ("Invalid Refresh Token", null);
	}
	_dbContext.Remove(existingRefreshToken);
	await _dbContext.SaveChangesAsync();

	var user = await _dbContext.User.Where(_ => _.Id == renewTokenRequest.UserId).FirstOrDefaultAsync();

	string jwtAccessToken = GenerateJwtAccessToken(user);
	string refreshToken = await GenerateRefreshToken(user.Id);
	var result = new JWTTokenResponseDto
	{
		AccessToken = jwtAccessToken,
		RefreshToken = refreshToken,
	};
	return ("",  result);
}
  • (Line: 3-6) Fetching the refresh token record from the 'UserRefreshToken' table.
  • (Line: 8-11) If a record is not found then return an error message.
  • (Line: 12-13) If a record exists then we delete the record because we will create a new refresh token along with the JWT access token.
  • (Line: 15-25) Generating the new JWT Access token and new Refresh token.
Let's add our refresh token endpoint in 'UserController'.
API_Project/Controllers/UserController.cs:
[HttpPost("renew-tokens")]
public async Task<IActionResult> RenewTokensAsync(RenewTokenRequestDto renewTokenRequest)
{
	var result = await _userService.RenewTokenAsync(renewTokenRequest);
	if (!string.IsNullOrEmpty(result.ErrorsMessage))
	{
		return BadRequest(result.ErrorsMessage);
	}
	return Ok(result.JWTTokenResponse);
}

Use Refresh Token In Blazor WebAssembly Application:

In our 'CustomAuthProvider' class we have methods like 'ParseCliamsFromJwt'(make this method public) , 'ParseBase64WithoutPadding()' move this method into a new file like 'Utility.cs'(new file under 'Providers' folder)
BlazorWasm/Shared/Providers/Utility.cs:
using JWT.Auth.BlazorUI.ViewModels.Account;
using Microsoft.AspNetCore.Components.Authorization;
using System.Security.Claims;
using System.Text.Json;

namespace JWT.Auth.BlazorUI.Shared.Providers
{
    public class Utility
    {
        public static IEnumerable<Claim> ParseClaimsFromJwt(string jwt)
        {
            var claims = new List<Claim>();
            var payload = jwt.Split('.')[1];

            var jsonBytes = ParseBase64WithoutPadding(payload);

            var keyValuePairs = JsonSerializer.Deserialize<Dictionary<string, object>>(jsonBytes);
            claims.AddRange(keyValuePairs.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString())));
            return claims;
        }
        private static byte[] ParseBase64WithoutPadding(string base64)
        {
            switch (base64.Length % 4)
            {
                case 2: base64 += "=="; break;
                case 3: base64 += "="; break;
            }
            return Convert.FromBase64String(base64);
        }
    }
}
Now in our 'CustomAuthProvider.cs' consume this method from the 'Utility.cs'
BlazorWasm/Shared/Providers/CustomAuthProvider.cs:
return new AuthenticationState(
 new ClaimsPrincipal(new ClaimsIdentity(Utility.ParseClaimsFromJwt(jwtToken), "jwtAuth")));
In the Blazor application let's create a new model like 'RenewTokenRequestVm'.
BlazorWasm_App/ViewModels/Account/RenewTokenRequest.cs:
namespace JWT.Auth.BlazorUI.ViewModels.Account
{
    public class RenewTokenRequestVm
    {
        public int UserId { get; set; }
        public string RefreshToken { get; set; }
    }
}
Now in 'CustomHttpHandler' let's update the logic in such a way that if the existing jwt access token expires then invoke the refresh token endpoint.
BlazorWasm/Shared/Providers/CustomHttpHandler.cs:
using Blazored.LocalStorage;
using JWT.Auth.BlazorUI.ViewModels.Account;
using System.Text.Json;
using System.Text;
using System.Net.Http.Json;
using Microsoft.AspNetCore.Components.Authorization;
using System.Threading;
using System.Net;

namespace JWT.Auth.BlazorUI.Shared.Providers
{
    public class CustomHttpHandler: DelegatingHandler
    {
        private readonly ILocalStorageService _localStorageService;
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly AuthenticationStateProvider _authStateProvider;
        public CustomHttpHandler(ILocalStorageService localStorageService,
            IHttpClientFactory httpClientFactory,
            AuthenticationStateProvider authenticationStateProvider)
        {
            _localStorageService = localStorageService;
            _httpClientFactory = httpClientFactory;
            _authStateProvider = authenticationStateProvider;
        }
        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            if(request.RequestUri.AbsolutePath.ToLower().Contains("login") ||
                request.RequestUri.AbsolutePath.ToLower().Contains("registration") ||
                request.RequestUri.AbsolutePath.ToLower().Contains("renew-tokens"))
            {
                return await base.SendAsync(request, cancellationToken);
            }

            var jwtToken = await _localStorageService.GetItemAsync<string>("jwt-access-token");

            if (!string.IsNullOrEmpty(jwtToken))
            {
                request.Headers.Add("Authorization", $"bearer {jwtToken}");
            }

            var originalResponse = await base.SendAsync(request, cancellationToken);
            if(originalResponse.StatusCode == HttpStatusCode.Unauthorized)
            {
                return await InvokeRefreshCall(request, originalResponse,jwtToken, cancellationToken);
            }
            return originalResponse; 
        }

        private async Task<HttpResponseMessage> InvokeRefreshCall(HttpRequestMessage originalRequest, 
            HttpResponseMessage originalResponse,
            string expiredJwtToken,
            CancellationToken cancellationToken)
        {
            var refreshToken = await _localStorageService.GetItemAsync<string>("refresh-token");

            var userCliams = Utility.ParseClaimsFromJwt(expiredJwtToken);

            var renewTokenRequest = new RenewTokenRequestVm();
            renewTokenRequest.UserId= userCliams.ToList().Where(_ => _.Type.ToLower() == "sub").Select(_ => Convert.ToInt32(_.Value)).FirstOrDefault();
            renewTokenRequest.RefreshToken = refreshToken;

            var jsonPayload = JsonSerializer.Serialize(renewTokenRequest);
            var requestContent = new StringContent(jsonPayload, Encoding.UTF8, "application/json");
            var httpClient = _httpClientFactory.CreateClient("API");

            var refreshTokenresponse = await httpClient.PostAsync("/api/User/renew-tokens", requestContent);

            if(refreshTokenresponse.StatusCode == HttpStatusCode.OK)
            {
                var regeneratedTokenResponse = await refreshTokenresponse.Content.ReadFromJsonAsync<JWTTokenResponseVM>();
                await _localStorageService.SetItemAsync<string>("jwt-access-token", regeneratedTokenResponse.AccessToken);
                await _localStorageService.SetItemAsync<string>("refresh-token", regeneratedTokenResponse.RefreshToken);
                (_authStateProvider as CustomAuthProvider).NotifyAuthState();

                originalRequest.Headers.Remove("Authorization");

                originalRequest.Headers.Add("Authorization", $"bearer {regeneratedTokenResponse.AccessToken}");

                return await base.SendAsync(originalRequest, cancellationToken);
            }
            return originalResponse;
        }
    }
}
  • (Line: 18&19) Injected 'AuthenticationStateProvider' & 'IHttpClientFactory'.
  • (Line: 29) Here we checking our refresh token endpoint, because the refresh token endpoint not need authentication.
  • (Line: 41) Storing the actual request response to 'originalResponse' variable
  • (Line: 41-46) If the original response status is 401 unauthorized then we execute the 'InvokeRefreshCall' method. Other than 401 status original response will be return as output.
  • (Line: 49-53) Here 'InvokeRefreshCall' method contains input parameters like previous failed requests and responses.
  • (Line: 54) Fetch the refresh token from the browser's local storage.
  • (Line: 56) Get 'UserId' value from jwt access token
  • (Line: 58-63) Prepare payload for the refresh token endpoint.
  • (Line: 64-66) Invoke the refresh token endpoint.
  • (Line: 68-80) Check refresh token endpoint success. Then store the new jwt access token and new refresh token in the browser's local storage. Also refreshes the authentication state of the Blazor web assembly application by invoking 'NotifyAuthState()' method.  Refresh the authorization header value inside of the 'originalRequest' object and again invoke the original request with new jwt access token.

Logout Endpoint In API Project:

Let's create a logout endpoint in our API project.

Let's create a new request object like 'Dtos/LogoutRequest.cs'.
API_Project/Dtos/LogourRequest.cs:
namespace JWT.Auth.API.Dtos
{
    public class LogoutRequestDto
    {
        public int UserId { get; set; }
        public string? RefreshToken { get; set; }
    }
}
In 'IUserService' let's add the following method definition.
API_Project/Services/IUserService.cs:
Task UserLogoutAsync(LogoutRequestDto logoutRequest);
In 'UserService' let's add the following method implementation.
API_Project/Services/UserService.cs:
public async Task UserLogoutAsync(LogoutRequestDto logoutRequest)
{
    var tokenToDelete = await _dbContext.UserRefreshToken
        .Where(_ => _.UserId == logoutRequest.UserId
        && _.Token == logoutRequest.RefreshToken).FirstOrDefaultAsync();

    if(tokenToDelete != null)
    {
        _dbContext.Remove(tokenToDelete);
        await _dbContext.SaveChangesAsync();
    }
}
Here we clear our refresh token from the database to make the user log out.

Let's add the endpoint in our user controller.
API_Project/Services/UserController.cs:
[HttpPost("logout")]
public async Task<IActionResult> Logout(LogoutRequestDto logoutRequest)
{
 await _userService.UserLogoutAsync(logoutRequest);
 return Ok();
}

Consume Logout Endpoint From BlazorWebAssembly Application:

In the Blazor application let's create a view model like 'LogoutVm'.
BlazorWasm/ViewModels/LogoutVm.cs:
namespace JWT.Auth.BlazorUI.ViewModels.Account
{
    public class LogoutVm
    {
        public int UserId { get; set; }
        public string? RefreshToken { get; set; }
    }
}
Now invoke the logout api from the 'MainLayout.razor' component.
BlazorWasm/Shared/MainLayout.razor:(HTML Part)
@using JWT.Auth.BlazorUI.Shared.Providers;
@using System.Security.Claims
@using Blazored.LocalStorage;
@using System.Text.Json;
@using System.Text;
@inject IHttpClientFactory _httpClientFactory
@inherits LayoutComponentBase
@inject ILocalStorageService _localStorageService
@inject AuthenticationStateProvider _authStateProvider;
@inject NavigationManager _navigationManager

<MudThemeProvider />
<MudDialogProvider />
<MudSnackbarProvider />

<MudLayout>
    <MudAppBar Color="Color.Primary" >
        <MudLink Underline="Underline.None" Color="Color.Inherit" Href="/">JWT Auth Demo</MudLink>
        <AuthorizeView>
            <Authorized>
                <MudLink Underline="Underline.None" Color="Color.Inherit" Href="/fetchdata" Class="ml-2">Weather Forecast</MudLink>
            </Authorized>
        </AuthorizeView>
        <MudSpacer />
        <AuthorizeView>
            <Authorized>
                <span class="mr-2">@(UserDisplayName(context.User.Claims.ToList()))</span>
                <MudLink Underline="Underline.None" Color="Color.Inherit" OnClick="(() => LogoutAsync(context.User.Claims.ToList()))">Logout</MudLink>
            </Authorized>
            <NotAuthorized>
                <MudLink Underline="Underline.None" Color="Color.Inherit" Href="/login" Class="mr-2">Login</MudLink>
                <MudLink Underline="Underline.None" Color="Color.Inherit" Href="/registration">Registration</MudLink>
            </NotAuthorized>
        </AuthorizeView>
        
    </MudAppBar>
    <MudMainContent>
        @Body
    </MudMainContent>
</MudLayout>
  • (Line: 6) Inject the 'IHttpClientFactory'.
  • (Line: 8) Inject the 'ILocalStorageService'.
  • (Line: 9) Inject the 'AuthenticationStateProvider'.
  • (Line: 10) Inject the 'NavigationManager'.
  • (Line: 28) Registered logout click functionality.
BlazorWasm/Shared/MainLayout.razor:(c# Part) 
@code {
    private string UserDisplayName(List<Claim> claims)
    {
        var firstName = claims.Where(_ => _.Type == "FirstName").Select(_ => _.Value).FirstOrDefault();
        var lastName = claims.Where(_ => _.Type == "LastName").Select(_ => _.Value).FirstOrDefault();

        if(!string.IsNullOrEmpty(firstName) || !string.IsNullOrEmpty(lastName))
        {
            return $"{firstName} {lastName}";
        }
        var email = claims.Where(_ => _.Type == "Email").Select(_ => _.Value).FirstOrDefault();
        return email;
    }

    private async Task LogoutAsync(List<Claim> claims)
    {
        var logout = new LogoutVm();
        logout.UserId = Convert.ToInt32(claims.Where(_ => _.Type == "Sub").Select(_ => _.Value).FirstOrDefault() ?? "0");
        logout.RefreshToken = await _localStorageService.GetItemAsync<string>("refresh-token");

        var jsonPayload = JsonSerializer.Serialize(logout);
        var requestContent = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

        var httpClient = _httpClientFactory.CreateClient("API");
        var response = await httpClient.PostAsync("/api/user/logout", requestContent);

        await _localStorageService.RemoveItemAsync("refresh-token");
        await _localStorageService.RemoveItemAsync("jwt-access-token");

        (_authStateProvider as CustomAuthProvider).NotifyAuthState();
        _navigationManager.NavigateTo("/login");
    }
}
  • (Line: 15-32) Here we implemented the 'LogoutAsync' method.
  • (Line: 18-25) For the logout endpoint we pass the 'userid', 'refreshtoken' values as the payload.
  • (Line: 27-31) Clear the browser local storage values and then navigate to the login page.

Support Me!
Buy Me A Coffee PayPal Me

Wrapping Up:

Hopefully, I think this article delivered some useful information on the.NET7 Blazor WebAssembly JWT Authentication. using I love to have your feedback, suggestions, and better techniques in the comment section below.

Refer:



Follow Me:

Labels:

Comments

Post a Comment

Popular posts from this blog

Angular 14 Reactive Forms Example

In this article, we will explore the Angular(14) reactive forms with an example. Reactive Forms: Angular reactive forms support model-driven techniques to handle the form's input values. The reactive forms state is immutable, any form filed change creates a new state for the form. Reactive forms are built around observable streams, where form inputs and values are provided as streams of input values, which can be accessed synchronously. Some key notations that involve in reactive forms are like: FormControl - each input element in the form is 'FormControl'. The 'FormControl' tracks the value and validation status of form fields. FormGroup - Track the value and validate the state of the group of 'FormControl'. FormBuilder - Angular service which can be used to create the 'FormGroup' or FormControl instance quickly. Form Array - That can hold infinite form control, this helps to create dynamic forms. Create An Angular(14) Application: Let'
3 comments
Read more

.NET 7 Web API CRUD Using Entity Framework Core

In this article, we are going to implement a sample .NET 7 Web API CRUD using the Entity Framework Core. Web API: Web API is a framework for building HTTP services that can be accessed from any client like browser, mobile devices, and desktop apps. In simple terminology API(Application Programming Interface) means an interface module that contains programming functions that can be requested via HTTP calls either to fetch or update data for their respective clients. Some of the Key Characteristics of API: Supports HTTP verbs like 'GET', 'POST', 'PUT', 'DELETE', etc. Supports default responses like 'XML' and 'JSON'. Also can define custom responses. Supports self-hosting or individual hosting, so that all different kinds of apps can consume it. Authentication and Authorization are easy to implement. The ideal platform to build the REST full services. Install The SQL Server And SQL Management Studio: Let's install the SQL server on our l
3 comments
Read more

ReactJS(v18) JWT Authentication Using HTTP Only Cookie

In this article, we will implement the ReactJS application authentication using the HTTP-only cookie. HTTP Only Cookie: In a SPA(Single Page Application) Authentication JWT token either can be stored in browser 'LocalStorage' or in 'Cookie'. Storing the JWT token inside of the cookie then the cookie should be HTTP Only. The HTTP-ONly cookie nature is that it will be only accessible by the server application. Client apps like javascript-based apps can't access the HTTP-Only cookie. So if we use the authentication with HTTP-only JWT cookie then we no need to implement the custom logic like adding authorization header or storing token data, etc at our client application. Because once the user authenticated cookie will be automatically sent to the server by the browser on every API call. Authentication API: To authenticate our client application with JWT HTTP-only cookie, I developed a NetJS(which is a node) Mock API. Check the GitHub link and read the document on G
3 comments
Read more

.NET6 Web API CRUD Operation With Entity Framework Core

In this article, we are going to do a small demo on AspNetCore 6 Web API CRUD operations. What Is Web API: Web API is a framework for building HTTP services that can be accessed from any client like browser, mobile devices, desktop apps. In simple terminology API(Application Programming Interface) means an interface module that contains a programming function that can be requested via HTTP calls to save or fetch the data for their respective clients. Some of the key characteristics of API: Supports HTTP verbs like 'GET', 'POST', 'PUT', 'DELETE', etc. Supports default responses like 'XML' and 'JSON'. Also can define custom responses. Supports self-hosting or individual hosting, so that all different kinds of apps can consume it. Authentication and Authorization are easy to implement. The ideal platform to build REST full services. Create A .NET6 Web API Application: Let's create a .Net6 Web API sample application to accomplish our
6 comments
Read more

Angular 14 State Management CRUD Example With NgRx(14)

In this article, we are going to implement the Angular(14) state management CRUD example with NgRx(14) NgRx Store For State Management: In an angular application to share consistent data between multiple components, we use NgRx state management. Using NgRx state helps to avoid unwanted API calls, easy to maintain consistent data, etc. The main building blocks for the NgRx store are: Actions - NgRx actions represents event to trigger the reducers to save the data into the stores. Reducer - Reducer's pure function, which is used to create a new state on data change. Store - The store is the model or entity that holds the data. Selector - Selector to fetch the slices of data from the store to angular components. Effects - Effects deals with external network calls like API. The effect gets executed based the action performed Ngrx State Management flow: The angular component needs data for binding.  So angular component calls an action that is responsible for invoking the API call.  Aft
8 comments
Read more

Angular 14 Crud Example

In this article, we will implement CRUD operation in the Angular 14 application. Angular: Angular is a framework that can be used to build a single-page application. Angular applications are built with components that make our code simple and clean. Angular components compose of 3 files like TypeScript File(*.ts), Html File(*.html), CSS File(*.cs) Components typescript file and HTML file support 2-way binding which means data flow is bi-directional Component typescript file listens for all HTML events from the HTML file. Create Angular(14) Application: Let's create an Angular(14) application to begin our sample. Make sure to install the Angular CLI tool into our local machine because it provides easy CLI commands to play with the angular application. Command To Install Angular CLI npm install -g @angular/cli Run the below command to create the angular application. Command To Create Angular Application ng new name_of_your_app Note: While creating the app, you will see a noti
5 comments
Read more

Unit Testing Asp.NetCore Web API Using xUnit[.NET6]

In this article, we are going to write test cases to an Asp.NetCore Web API(.NET6) application using the xUnit. xUnit For .NET: The xUnit for .Net is a free, open-source, community-focused unit testing tool for .NET applications. By default .Net also provides a xUnit project template to implement test cases. Unit test cases build upon the 'AAA' formula that means 'Arrange', 'Act' and 'Assert' Arrange - Declaring variables, objects, instantiating mocks, etc. Act - Calling or invoking the method that needs to be tested. Assert - The assert ensures that code behaves as expected means yielding expected output. Create An API And Unit Test Projects: Let's create a .Net6 Web API and xUnit sample applications to accomplish our demo. We can use either Visual Studio 2022 or Visual Studio Code(using .NET CLI commands) to create any.Net6 application. For this demo, I'm using the 'Visual Studio Code'(using the .NET CLI command) editor. Create a fo
7 comments
Read more

Part-1 Angular JWT Authentication Using HTTP Only Cookie[Angular V13]

In this article, we are going to implement a sample angular application authentication using HTTP only cookie that contains a JWT token. HTTP Only JWT Cookie: In a SPA(Single Page Application) Authentication JWT token either can be stored in browser 'LocalStorage' or in 'Cookie'. Storing JWT token inside of the cookie then the cookie should be HTTP Only. The HTTP-Only cookie nature is that it will be only accessible by the server application. Client apps like javascript-based apps can't access the HTTP-Only cookie. So if we use authentication with HTTP only JWT cookie then we no need to implement custom logic like adding authorization header or storing token data, etc at our client application. Because once the user authenticated cookie will be automatically sent to the server by the browser on every API call. Authentication API: To implement JWT cookie authentication we need to set up an API. For that, I had created a mock authentication API(Using the NestJS Se
Post a Comment
Read more

ReactJS(v18) Authentication With JWT AccessToken And Refresh Token

In this article, we are going to do ReactJS(v18) application authentication using the JWT Access Token and Refresh Token. JSON Web Token(JWT): JSON Web Token is a digitally signed and secured token for user validation. The JWT is constructed with 3 important parts: Header Payload Signature Create ReactJS Application: Let's create a ReactJS application to accomplish our demo. npx create-react-app name-of-your-app Configure React Bootstrap Library: Let's install the React Bootstrap library npm install react-bootstrap bootstrap Now add the bootstrap CSS reference in 'index.js'. src/index.js: import 'bootstrap/dist/css/bootstrap.min.css' Create A React Component 'Layout': Let's add a React component like 'Layout' in 'components/shared' folders(new folders). src/components/shared/Layout.js: import Navbar from "react-bootstrap/Navbar"; import { Container } from "react-bootstrap"; import Nav from "react-boot
Post a Comment
Read more

A Small Guide On NestJS Queues

NestJS Application Queues helps to deal with application scaling and performance challenges. When To Use Queues?: API request that mostly involves in time taking operations like CPU bound operation, doing them synchronously which will result in thread blocking. So to avoid these issues, it is an appropriate way to make the CPU-bound operation separate background job.  In nestjs one of the best solutions for these kinds of tasks is to implement the Queues. For queueing mechanism in the nestjs application most recommended library is '@nestjs/bull'(Bull is nodejs queue library). The 'Bull' depends on Redis cache for data storage like a job. So in this queueing technique, we will create services like 'Producer' and 'Consumer'. The 'Producer' is used to push our jobs into the Redis stores. The consumer will read those jobs(eg: CPU Bound Operations) and process them. So by using this queues technique user requests processed very fastly because actually
8 comments
Read more