Скачать или смотреть Integrating Dio Interceptors with Flutter Riverpod for Token Management

Discover how to manage `access tokens` and `refresh tokens` using `Dio` interceptors in Flutter with Riverpod, ensuring robust API interactions in your app.
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Integrating Dio Interceptors with Flutter Riverpod for Token Management

When building mobile applications, handling authentication effectively is crucial. One common challenge developers face is managing expired access tokens when making API requests. In this guide, we'll explore how to add a Dio interceptor to your Flutter Riverpod application, which will allow you to seamlessly refresh access tokens using a refresh token whenever a 401 Unauthorized response is encountered. Let's dive in!

The Problem: Expired Access Tokens

Imagine you have a Flutter app that communicates with a backend server and requires user authentication. Access tokens, which are used to authenticate these requests, can expire. If your application tries to use an expired token, the server responds with a 401 Unauthorized status, leading to failed API requests.

To mitigate this, we need to implement a mechanism to automatically refresh the access token when it becomes invalid. This is where Dio interceptors come into play.

The Solution: Using Dio Interceptors

To tackle this issue, we will follow these steps:

Create a Custom Interceptor: This interceptor will handle requests and responses to manage the authentication workflow.

Separete Dio Instances: Use two separate instances of Dio—one for making regular API requests and another specifically for authentication.

Set Up Providers: Use Riverpod to manage the state and dependencies of our Dio instance and authentication service.

Step 1: Create a Custom Interceptor

The custom interceptor will check if the access token is still valid. If it’s expired, it will attempt to refresh it using the refresh token.

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Step 2: Separate Dio Instances

We'll need to create two instances of the Dio class:

One for authentication-related requests, which will include the interceptor we just created.

Another for general API calls.

Here's how you can set it up in your provider:

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Step 3: Set Up API Call Provider

Now, you can use the dioProvider to make secure API calls:

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Conclusion

By following the steps outlined above, you can effectively manage access tokens and refresh them automatically using Dio interceptors in your Flutter Riverpod application. This solution not only improves user experience but also enhances the security of your API interactions.

As you implement this in your project, remember to handle your tokens cautiously and ensure users are logged out appropriately if token refresh fails. Happy coding!