[core][feature] Fetching TDs behind authentication mechanism is not possible

[egekorkan]

When using the fetch function in core/helpers.ts, it is not possible to supply credentials required to fetch a TD. Once I look at the underlying implementation, it calls the readResource of the corresponding binding. This means that, if we change the fetch function's interface to accept credentials, it would need to be transferred to the corresponding binding. This might sadly require more changes since the credentials are added based on the id and there is no id at that point. It could very well be that where the TD is fetched have different security mechanism.

I would thus propose that instead of mapping fetch to readResource, another function can be created in each binding that has a different interface. This is related to an issue in Scripting API: w3c/wot-scripting-api#216

[relu91]

I suggest putting this issue on hold until we discuss more about w3c/wot-scripting-api#216. There are good chances that a discovery direct method may also allow security configurations for the request.

So the best solution right now is to fetch the TD using node-fetch or similar libraries.