Скачать или смотреть How to Preserve Extra Query Parameters in Azure AD B2C Authentication

Learn how to keep extra query parameters in Azure AD B2C authentication flows. We provide a step-by-step solution for maintaining query parameters across page loads and when navigating through social IDPs.
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How to Preserve Extra Query Parameters in Azure AD B2C Authentication

When developing applications that use Azure AD B2C for authentication, you may find the need to pass additional query parameters along with your authentication requests. These parameters can provide valuable context, such as tracking information or source identifiers. However, many developers face a common issue: losing these extra query parameters when navigating to different pages or when engaging with social identity providers (IDPs). Today, we will explore how to effectively maintain these extra query parameters during the authentication process.

The Problem

Imagine that you have integrated Azure AD B2C into your web application. As part of your authentication flow, you would like to include extra query parameters—such as utm_source—to track the source of your traffic. You successfully add these parameters to your initial login URL using Microsoft Authentication Library (MSAL), like so:

[[See Video to Reveal this Text or Code Snippet]]

This results in a URL that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

However, upon clicking the Sign Up link or navigating to any other page, the resulting URL loses these extra parameters, leading to various challenges. Here’s an example of what happens:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Maintaining Query Parameters

To ensure that your extra query parameters are preserved throughout the authentication flow, follow these steps:

Step 1: Resolve Query Parameters Early

The first step is to extract and store these extra query parameters at the beginning of your authentication process. This means you want to capture them as soon as the user lands on your authentication page. By doing so, you can manage them effectively as users move through the different pages in the flow.

Use JavaScript or TypeScript to retrieve the query parameters from the URL on page load.

Store them in a variable or a more persistent storage option like localStorage or sessionStorage.

Step 2: Append Parameters to Subsequent Navigation

Once you have captured the query parameters, ensure to append them back to any redirect URLs you create when navigating through signup processes or back from social IDP confirmations.

Before performing any navigation, check if the stored query parameters exist.

If they do, include them in the URL you are redirecting to.

Step 3: Social IDP Considerations

If your application employs social IDPs, you will need to ensure that the extra query parameters persist when the user returns from the social confirmation page:

When redirecting to a social login, preserve the extra parameters in the return URL.

Use the same logic as above to append the captured parameters back into the URL as soon as the user comes back to your application after social authentication.

Conclusion

By effectively capturing and re-adding your extra query parameters throughout the various stages of your Azure AD B2C authentication flow, you can maintain important tracking and contextual data. This not only enhances your application's ability to provide analytics but also improves user experience by ensuring that important information remains consistent across pages and interactions. With this approach, you are well-equipped to handle additional query parameters and help ensure the integrity of your authentication processes!

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