Support lookups for 'your' URIs

[djmattyg007]

This adds the ability to utilise the "spotify:your:tracks" and
"spotify:your:albums" URIs through library lookups.

[djmattyg007]

I believe this should resolve #297

[marnunez]

It does! Thanks!

[kosciej16]

@djmattyg007 Is there a chance to merge it? Possibility of playing liked songs would be awesome!

[kingosticks]

Suggested change

	web_album = item.get("album", item)
	if not translator.valid_web_data(web_album, "album"):
	continue
	sp_link = session.get_link(web_album.get("uri"))
	album_ref = translator.web_to_album_ref(web_album)
	if album_ref is None:
	continue
	sp_link = session.get_link(album_ref.uri)

[djmattyg007]

Would you be able to explain what the meaningful difference is between the two versions of this code?

[kingosticks]

Using the existing function hides the internal Web API structure and does some error checking for you. I appreciate you still need to know how the response is structured later on but this is one less place. I also have so far preferred not to called valid_web_data outside of the translator (although maybe we do this already, I can't remember and I've not checked)

[djmattyg007]

I've updated this PR. It should be good to go 👍

[kingosticks]

Cool, so as a resulf of this we can now do:

• core.library.lookup(uris=["spotify:your:tracks"])
• core.library.search(query={"uris": ["spotify:your:tracks"]})

e.g.

curl -d '{"jsonrpc": "2.0", "id": 1, "method": "core.library.lookup", "params": {"uris": ["spotify:your:tracks"]}}' -H 'Content-Type: application/json' http://localhost:6680/mopidy/rpc

curl -d '{"jsonrpc": "2.0", "id": 1, "method": "core.library.search", "params": {"query": {"uri": ["spotify:your:tracks"]}}}' -H 'Content-Type: application/json' http://localhost:6680/mopidy/rpc

Perhaps we can use this functionality when we fix #328 (in a later PR).