Skip to main content

Part-3 Steps To Implement Google Authentication Into Existing Blazor WebAssembly Standalone Application

In this article, we will understand steps to integrate google authentication from scratch manually into the Blazor WebAssembly standalone application. Part-1 google authentication steps by default bundled with blazor webassembly application on selecting the authentication checkbox while creating the project. But here we will inject the authentication into the project that is not previously enabled with authentication.

Create Blazor WebAssembly Project:

Let's create a Blazor WebAssembly project without checking the authentication.

Install Authentication NuGet:

Package Manager:
Install-Package Microsoft.AspNetCore.Components.WebAssembly.Authentication -Version 5.0.5
.Net CLI:
dotnet add package Microsoft.AspNetCore.Components.WebAssembly.Authentication --version 5.0.5

Register Blazor Application In Google API's Console:

Step1: 
Create an account in Google API's Console(https://console.cloud.google.com/apis/dashboard).

Step2:
Select the 'Credentials' menu and then click on 'Create Credentials'options and then select 'OAuth Client ID'.

Step3:
Register our application here:
  • Create a name for our application.
  • Then register our blazor web assembly application domain.
  • Then register login callback URL.(its path should be fixed like '/authentication/login-callback', so these URL's automatically defined by our blazor application).
Step4:
Now download the JSON file for settings that we need to configure in our Blazor Web Assembly application.

Configure Settings In Blazor WebAssembly Application:

Now in the app settings file in 'wwwroot' folder need to configure the following settings:
  • Authority -  value should be a domain. So for google authentication, its value should be "https://accounts.google.com/".
  • ClientId - its value copy from the downloaded JSON file from google console.
  • PostLogoutRedirectUri - its default path should be '/authentication/logout-callback'. Application will be redirect to this path on clicking logout.
  • RedirectUri - its default path should be '/authentication/login-callback'. This path should match with the google registered path value. This path used to redirect applications on redirect.
  • ResponseType - its value should be 'id_token'.
wwwroot/appsettings.Development.json:
{
  "Local": {
    "Authority": "https://accounts.google.com/",
    "ClientId": "your_google_console_clientId",
    "PostLogoutRedirectUri": "https://localhost:5001/authentication/logout-callback",
    "RedirectUri": "https://localhost:5001/authentication/login-callback",
    "ResponseType": "id_token"
  }
}

Configure OIDC Service:

Now configure the OIDC service in the 'Program.cs' file
Program.cs:
builder.Services.AddOidcAuthentication(options => {
	builder.Configuration.Bind("Local", options.ProviderOptions);
});
  • Here binding or loading the authentication settings from JSON into OIDC auth service.

Create Authentication Component:

If you recall in previous steps you can observe authentication ur's like 'authentication/logout-callback', 'authentication/login-callback', etc. These all paths related to 'authentication' need to be loads this newly creating authentication component. This component will contain blazor defined component like 'RemoteAuthenticatorView'. The 'RemoteAuthenticatorView' component will perform all auth workflow based on the URL path.
Pages/Authentication.razor:
@page "/authentication/{action}"
@using Microsoft.AspNetCore.Components.WebAssembly.Authentication

<RemoteAuthenticatorView Action="@Action">

</RemoteAuthenticatorView>

@code{
    [Parameter] public string Action { get; set; }
}
  • Here part of the URL is passed as input param to 'RemoteAuthenticatiorView' component. So based on the path login flow executes.

Add AuthenticationService.js:

On installing the blazor webassembly authentication library it also creates a js file like 'AthenticationService.js' file. This js file contains core logic for the authentication process. So we need to add the reference of this js file into our index.html file just above the closing body tag.
wwwroot/index.html:
<script src="_content/Microsoft.AspNetCore.Components.WebAssembly.Authentication/AuthenticationService.js">
</script>

CascadingAuthenticationState Component:

To inject authentication state into our blazor webassembly application then the CascadingAuthenticationState component should be the parent component of the entire application. The CascadingAuthenticationState must be rendered in 'App.razor' component.
App.razor: 
@using Microsoft.AspNetCore.Components.Authorization
<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
        <Found Context="routeData">
            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>
  • The 'CascadingAuthenticationState' component loads from the 'Microsoft.AspNetCore.Components.Authorization'.

Create Login And Logout Button:

Now in the 'Shared' folder let's create a new component like 'LoginDisplay.razor'
Shared/LoginDisplay.razor:
@using Microsoft.AspNetCore.Components.Authorization
@using Microsoft.AspNetCore.Components.WebAssembly.Authentication

@inject NavigationManager Navigation
@inject SignOutSessionStateManager SignOutManager

<AuthorizeView>
    <Authorized>
        Hello, @context.User.Identity.Name!
        <button class="nav-link btn btn-link" @onclick="BeginSignOut">Log out</button>
    </Authorized>
    <NotAuthorized>
        <a href="authentication/login">Log in</a>
    </NotAuthorized>
</AuthorizeView>

@code{
    private async Task BeginSignOut(MouseEventArgs args)
    {
        await SignOutManager.SetSignOutState();
        Navigation.NavigateTo($"authentication/logout");
    }
}
  • (Line: 13) The 'Login' button configured. It navigates our 'Authentication.razor' component. So in the URL 'login' keyword plays a crucial role based on this appropriate login functionality will be triggered by the 'RemoteAuthenticatorView' component.
  • (Line: 10) The logout button configured with the 'BeginSingOut' callback method.
  • (Line: 18-22) Before logging out we need to set an application state like 'SignOutManager.SetSignOutState' and navigated to the 'Authentication.razor' component. Based on 'logout' keyword logout functionality triggered.
Now we can run our app and test the google authentication.
So that all about the core steps to integrate google authentication from scratch into the Blazor WebAssembly application.

Video Session:

Support Me!
Buy Me A Coffee PayPal Me

Wrapping Up:

Hopefully, I think this article delivered some useful information about adding google users to the database and generating JWT Blazor Webassembly Standalone Application. I love to have your feedback, suggestions, and better techniques in the comment section below.

Follow Me:

Comments

  1. How do configure this If I have authentication using Identity framework?

    ReplyDelete
    Replies
    1. I am having problem as the Authorize works for the Identity, not the Google authentication. Is it possible to have two authentication providers? This is the error that I am getting:
      blazor.webassembly.js:1 crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Specified cast is not valid.
      System.InvalidCastException: Specified cast is not valid.
      at Microsoft.Extensions.DependencyInjection.WebAssemblyAuthenticationServiceCollectionExtensions.<>c__0`3[[Microsoft.AspNetCore.Components.WebAssembly.Authentication.RemoteAuthenticationState, Microsoft.AspNetCore.Components.WebAssembly.Authentication, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.AspNetCore.Components.WebAssembly.Authentication.RemoteUserAccount, Microsoft.AspNetCore.Components.WebAssembly.Authentication, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.AspNetCore.Components.WebAssembly.Authentication.OidcProviderOptions, Microsoft.AspNetCore.Components.WebAssembly.Authentication, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]].b__0_0(IServiceProvider sp)
      at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
      at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=5.0.0.1, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSiteMain(ServiceCallSite callSite, RuntimeResolverContext argument)
      at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
      at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)

      Delete
    2. Hi mns,
      if you want to use Microsoft Identity Authentication,
      Then you can't do it directly in blazor webassembly, you must depend on Web API . So in web API you have to implement the identity authentication. Then blazor webassembly side you need to use jwt token for authentication.


      I had another blog for jwt token authentication in blazor webassembly
      https://www.blogger.com/blog/statspost/week/7124990149159442330/6946558683561756493

      Delete
    3. Thanks a lot for fast reply sir. Log in using Identity framework is working, however not with the Google authentication using oauth.

      Delete
    4. And I do have a web api. To be specific, I am actually trying to receive google contacts using People API. I am able to do this via web api, however, I cannot retrieve the results from API on Blazor web assembly project. I am using HttpClient on Blazor. The error in console says "Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request". But thank you, I will take a look at the article you posted.

      Delete
  2. Hello,

    thanks for the blog. I recieve an error :

    "There was an error trying to log you in: 'No authority or metadataUrl configured on settings"

    ReplyDelete
    Replies
    1. I received the same error, i decided to forget Blazor. The sample program doesn't even work

      Delete

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'

.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

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

.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

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

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

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

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

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

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