url/metadata_url not passed to icecast output

[EricVanGorkom]

In addition to issue #2676 where the opposite thing is described, I want to pass the "url" metadata to an icecast output; in icecast itself it will be visible as "metadata_url".

It isn't processed by the output.icecast when I add "url" (or "metadata_url") to the metadata; however, I can pass the same metadata list (including "url") with an icy.update_metadata and it's processed correctly then by my icecast server, however, it'd be much more cleaner codewise to be able to just add it to the metadata list that is processed with the output.icecast - especially when you have multiple outputs for the same audiostream.

[toots]

Hi @EricVanGorkom. To prevent potential leaks, exported metadata are filtered. See this setting: https://www.liquidsoap.info/doc-2.1.4/settings.html#exported-metadata

I'm adding "metadata_url" to the list, this will provide an end-to-end solution from input.harbor and output.icecast and prevent using the generic "url" label which may lead to inadvertent leak of internal request url.