What sets apart genuine user interactions from programmatically generated actions?

Working with webkit notifications on Chrome has presented a challenge. The

window.webkitNotifications.requestPermission
method must be called from a user action, such as a click. Attempting to call it at any other time will not have any effect and will not produce an error.

Despite the restriction, there are situations where I need to run this method later on, triggered by another event that was originally generated by an authentic click.

I attempted to simulate a real click event in order to run the method like this:

var a = document.createElement('a');
a.addEventListener('click', function () {
  window.webkitNotifications.requestPermission()
});
var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("click", true, true, window, 1, 0, 0, 0, 0,
false, false, false, false, 0, null);
a.dispatchEvent(evt);

As anticipated, this simulated click did not trigger the method. This raises questions about how Chrome distinguishes genuine user actions from those that are generated programmatically.

I also tried keeping a reference to the original click event and passing it back when attempting to call the method again, but it proved ineffective.

To better illustrate my dilemma, I've created a fiddle: http://jsfiddle.net/arnaudbreton/B38yJ/1/

Answer №1

Every click action initiated by the user will contain a hidden property that specifies whether it was initiated by the user or not. This property isn't visible to developers, but is essential for the JavaScript engine.

This measure is crucial to prevent malicious scripts from executing on the user's browser, especially when encountering a potentially harmful website unintentionally.

For instance, attempting to open a file browser dialog by simulating a click event on input[type=file] won't work. A genuine click event from the user is required to trigger the file browser.

Furthermore, all event listeners must be synchronous in order to execute security-sensitive functions as demonstrated in the example above.

To sum up, counterfeit events are unable to access security-sensitive browser APIs.

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