What is the best way to verify if an XMLHttpRequest made to my public API originates from my own web application or from a third-party client in order to maintain priority?

Is there a method to determine on the API side whether a XMLHttpRequest is coming from my own web application (i.e. the JavaScript I developed) or from a third-party application?

The issue appears to be that since the JavaScript runs on the client side and is accessible to anyone, there is no way to covertly identify to the API server which requests are being made by me. This identification can be beneficial in order to prioritize requests from my own application over those from third-party clients during times of high traffic.

One option could be sending undisclosed parameters, but these can easily be faked.

Anyone have any brainstorming ideas?

javascriptajaxapiauthenticationxmlhttprequest

Answer №1

To enhance security, I recommend having your web server application generate a unique token for each client. This token can be passed to clients through JavaScript or a hidden field, which they will then use to access your API. Clients with valid tokens will receive priority, while those with missing or invalid tokens will not. By creating and registering these tokens in a secure manner (such as limiting their usefulness with a time constraint), you can protect your system from unauthorized access.

Answer №2

If you are open to allowing third-party clients to access your API, one suggestion could be to offer them a modified, limited interface along with clear documentation to facilitate their use of it.

One approach could involve creating two distinct API URLs:

  • /api?client=ThirdPartyAppName&...
    for third-party applications (this URL would be promoted for use)
  • /api?token=<number generated from hidden fields in the HTML page using obfuscated code>&...
    for internal JS integration

It's worth noting that preventing reverse engineering of your code entirely may not be feasible. Even compiled binary code, such as C++, can eventually be decoded, posing a risk to any strategy reliant on secrecy (source).

Answer №3

When considering ways to protect confidential information, a few strategies come to mind. I firmly believe that keeping secrets always leads to trouble, so it's best to avoid that route.

  • One option is running another instance on an undisclosed port

  • Another approach could involve implementing SSL and utilizing certificates for client identification

  • A simpler yet less secure method might be relying on cookies for authentication

  • Alternatively, you could use IP addresses, although this might result in added administrative complexities

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