Can a prototype be created in JavaScript for a "FileList" object type that enables the construction and addition of a "File" object within it?

This is my first time attempting to create a prototype, and I'm struggling to grasp the concept of callback functions. My current project involves automating the firmware update process for our company's routers using Python, Selenium, and PhantomJS.

The javascript processes the firmware file through an onsubmit event before sending it to the target. This means I can't simply send the file with a basic request.

https://i.sstatic.net/MhMJo.png

The router script validates the form parameters and initiates the update process if they are correct.

From my developer tools window, I was able to create the firmware file as a File object stored in a variable named

data_transfer_object.dataTransfer.files
, which is a type of File Object.

My goal is to assign this File Object to the input[type="file"] form element with the name "firmware".

To do this, I need to assign

document.getElementById("firmware").files
to a FileList object. However, I have File Objects, not items of a FileList object.

  • Is there a way to write a prototype to create a FileList object and add File Objects inside?

or

  • Is there an alternate method to assign my File Object to the input[type="file"] form element?

None of the following assignments seem to be working:

document.getElementById("firmware").files[0] = data_transfer_object.dataTransfer.files
document.getElementById("firmware").files.item[0]= data_transfer_object.dataTransfer.files
document.getElementById("firmware")[0] = data_transfer_object.dataTransfer.files

Thank you!

Answer №1

According to Florent B., adding files to a file list from the page is not possible due to security reasons. However, there are workarounds using Selenium depending on the action that needs to be simulated. For example, you can directly assign a file to an <input type="file"> with

element.send_keys('path to file')

The Selenium command send_keys solved my issue. The reason it didn't work for me was because of an incorrect path.

Special thanks to Florent B.

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