Addon for Firefox: Image Upload

I am looking for a way to streamline the process of uploading an image to a website through a Firefox Addon.

While I know it is possible to use createElement('canvas'), convert Image data to base64, and XHR POST the data, I would prefer to leverage Firefox's built-in functionality if at all possible.

Typically, when a user clicks BROWSE on a site, Firefox opens a File Upload dialogue, where they can select a file and then click OPEN.

My goal is to automate this process from the context menu so that a local file opened by the browser (such as an image) can be uploaded directly to the destination.

Is this feasible, and if so, how can it be achieved?

Further Explanation:

When selecting a file for upload in Firefox, the following data is required:
- target form
- local file location
- The action linked to the OPEN button in the FILE UPLOAD dialogue box

In the context menu scenario I envision creating:
- target form: will be predefined in the script
- local file location: the file right-clicked (i.e. gContextMenu.target.src)
- The action: my objective is to utilize and attach 'command' to the function of the aforementioned button in Firefox

This means I want to avoid manually setting up new XMLHttpRequest() and posting the data, opting instead to rely on Firefox's existing function.

In essence, I aim to provide the 'target form' & 'local file location' to the OPEN button function in FILE UPLOAD as if the standard process were being followed.

javascriptajaxfirefox-addonfirefox-addon-restartless

Answer №1

Utilizing the DOM File Object

The File constructor can accept plain paths (specifically from privileged code)

var xhr = new XMLHttpRequest();
xhr.open("POST", "http://example.org/");
xhr.setRequestHeader("Content-Type",
                     "application/octet-stream");
xhr.send(new File("/tmp/test.upload"));

This method can also be combined with form data for more functionality.

Implementing an Input Stream

You have the option to send nsIInputStream. Locate the file path, initialize a nsIFileInputStream, which is essentially a "super-interface" of nsIInputStream, and use send() to transmit the data with the appropriate Content-Type.

var {classes: Cc, interfaces: Ci, utils: Cu} = Components;

Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/FileUtils.jsm");

var stream = Cc["@mozilla.org/network/file-input-stream;1"].
  createInstance(Ci.nsIFileInputStream);
stream.init(FileUtils.File("/tmp/test.upload"),
            -1, -1,
            Ci.nsIFileInputStream.DEFER_OPEN);
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://example.org/");
xhr.setRequestHeader("Content-Type",
                     "application/octet-stream");
xhr.send(stream);

(If I remember correctly), this approach can also be paired with nsIMultiplexInputStream for creating more intricate data payloads.

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