Runtime.addBinding to create a MessageChannel pairing?

[guest271314]

Is it possible to use DevTools Runtime.addBinding to create a MessageChannel pairing between MessagePort in extension ServerWorker and MessagePort created by the function in arbitrary Web page?

[Ben Noordhuis]

On Sun, Jan 29, 2023 at 4:30 PM guest271314 <guest...@gmail.com> wrote:
>
> Is it possible to use DevTools Runtime.addBinding to create a MessageChannel pairing between MessagePort in extension ServerWorker and MessagePort created by the function in arbitrary Web page?

No. addBinding adds a single-arg function to the execution context. It
sends a 'bindingCalled' event (plus the string argument) to the
inspector client when called. And that's all it does.

[guest271314]

Thanks. Three paths I have been thinking about are 1) some means to get a reference to arbitrary Window object in the ServiceWorker; 2) locating all Chromium ServiceWorker dependencies and extracting that code to create a standalone, dedicated MessageChannel between ServiceWorker and arbitrary Web pages; 3) locating all Chromium ServiceWorker dependencies and extracting that code to create a standalone ServiceWorker mapped to localhost to use as a local server.

Right now I am dynamically setting externally_connectable of an extension to arbitrary Web pages and using the JSON-based messaging system extensions use to stream from Native Messaging host to ServiceWorker then to Web page. Preferably we could use transferable objects or just the onfetch handler of the ServiceWorker. I imagine neither option is a simple task.

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