I am currently working on an Angular 8 app that is integrated with .NET Core. My goal is to find a way to refresh a JWT token within the application.
Within the integration, users are able to validate and receive a token which expires after 30 minutes.
The desired outcome is for the Angular app to detect when the token only has 5 minutes left before expiration, prompting it to automatically generate a new token by making a call to the web API.
For a detailed explanation on how to refresh JWT tokens, check out this link.
Make sure to review the server-side code below:
Create token
[HttpPost("Authenticate")]
[AllowAnonymous]
[ProducesResponseType(StatusCodes.Status400BadRequest)]
[ProducesResponseType(typeof(TokenResponse), StatusCodes.Status200OK)]
public async Task<IActionResult> Authenticate([FromBody]LoginModel model)
{
// Implementation of creating a new token for authentication
}
Refresh token
[HttpPost]
[AllowAnonymous]
[Route("Token/Refresh")]
[ProducesResponseType(StatusCodes.Status400BadRequest)]
[ProducesResponseType(StatusCodes.Status401Unauthorized)]
[ProducesResponseType(typeof(TokenResponse), StatusCodes.Status200OK)]
public async Task<IActionResult> RefreshToken([FromBody] RefreshToken refreshToken)
{
// Implementation of refreshing the token
}
By following the instructions in this sample, you can implement the following code snippet.
login(user: LoginModel): Observable<any> {
return this.getTokens(user, 'password')
.catch(res => Observable.throw(res.json()))
.do(res => this.scheduleRefresh());
}
private scheduleRefresh(): void {
this.refreshSubscription$ = this.tokens$
.first()
// refresh every half the total expiration time
.flatMap(tokens => Observable.interval(tokens.expires_in / 2 * 1000))
.flatMap(() => this.refreshTokens())
.subscribe();
Upon logging in, the scheduleRefresh function will automatically refresh the token in the background.
Discover a highly useful library for handling JWT in Angular applications.
Don't hesitate to check it out: https://github.com/auth0/angular2-jwt
This library simplifies token management by automatically sending the token for each http request.
It even allows you to request a refresh token if the current token expires.
All these features are built into the library, making it easier and more secure than managing tokens manually.
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