Viber Desktop Login: Understanding Device Code Flow

The Viber desktop login process involves acquiring tokens to perform web API calls, which are essential for various applications. One of the methods used to achieve this is called Device Code Flow, a two-step process designed specifically for devices and operating systems without a built-in web browser.

In the first step, the PublicClientApplicationBuilder is used to create an instance of the IPublicClientApplication, which requires the authority to be passed in. The authority needs to be specified correctly to ensure successful authentication. The Device Code Flow is only available on public client applications, making it an ideal solution for command-line tools (CLI) and other applications running on IoT devices.

When user authentication is required, the app provides a code and prompts the user to use another device, such as an internet-connected smartphone, to navigate to a specific URL. The user will then be asked to enter the code, allowing them to complete the authentication process interactively.

This two-step process ensures that tokens are obtained securely, even on devices without a web browser. By using Device Code Flow, applications can authenticate users and obtain the necessary tokens to perform web API calls. This method is particularly useful for devices and operating systems that do not provide a built-in web browser or require multi-factor authentication.

In contrast, interactive authentication with Azure AD requires a web browser, making Device Code Flow an essential alternative for devices without this capability. Additionally, it's important to note that Device code flow is not supported by Azure AD B2C.

Overall, the Viber desktop login process relies on Device Code Flow to obtain tokens and ensure secure user authentication. By understanding how this process works, developers can create more effective and secure applications that cater to a wide range of devices and operating systems.