How to jump from Word plug-in to browser for login authorization?

Implementation method of jumping into an external application for login authorization

Many applications require users to log in to an external application (such as a website). For example, a Word plug-in requires users to log in to their official website for authorization. After the user clicks the plug-in login button, the system will automatically open the default browser and jump to the plug-in official website. Regardless of whether the user has logged into the official website or not, the Word plug-in can successfully log in after completing the login and authorization.

This process seems complicated, especially when you cannot directly get the callback after jumping from Word to the browser. But its principle is similar to logging in with a computer QR code when scanning a mobile phone:

Word plugin	Scan the QR code to log in on your mobile phone
Jump from Word to browser, unable to get callbacks directly	Open the link on your phone, and you cannot directly get the callback on your phone
Two different applications	The application of computer displaying QR code is different from that of mobile phone applications

The key lies in the communication mechanism between the Word plug-in and the official website. This is not a direct browser callback, but rather a cross-application communication through other means such as custom protocols or APIs.

After the user completes login and authorization on the official website, the official website will notify the Word plug-in through a predefined mechanism to complete the authorization process. This may involve:

• Custom URL Scheme: After the authorization is successful, the official website redirects to a custom URL Scheme (for example, wordplugin://authorized ), the Word plug-in listens to this Scheme and obtains authorization information based on the URL parameters.
• Polling mechanism: Word plug-in regularly sends requests to the official website to query the authorization status.
• WebSocket or Server-Sent Events: The official website uses WebSocket or Server-Sent Events to notify the Word plug-in authorization status in real time.
• API callback: The official website provides an API interface. The Word plug-in provides a callback URL before authorization. After the authorization is successful, the official website calls the URL to notify the plug-in.

Therefore, the key to realizing in-app jump to external applications for login authorization is to design and implement a reliable communication mechanism between the official website and the plug-in. The mechanism to choose depends on the specific application scenario and technology stack.

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