Connecting track names and artist names with Spotify Uris
I've found related questions (like this one), but nothing that directly answers my question: I need a direct way to turn artist name and track name into a spotify link. Just like spotify does for the local file list (some are links, some are not, I assume because spotify doesn't have those tracks.
How can I turn something like artist:'Francolin' and track name:'Hospital Song' into a Spotify uri without searching for it (which will return multiple results, and I don't know which one to use). How does the Spotify local files list do it?
I ran into the same problem as you but I don't think there's a direct way to convert it. Instead I just run for a search with "artist:'$artist' title:'$title'", which should be very accurate, and just use the first result in the array of results.
The local files list in the Spotify client makes URLs like this:
spotify:local:Coldplay:Mylo+Xyloto:Paradise:277 ( spotify:local:ARTIST:ALBUM:TRACK:LENGTH_IN_SECONDS ). You can verify this by right-clicking a local file in your list that hasn't been linked to a Spotify track and choosing "Copy Spotify URI".
When playing the track, the client resolves it without using the backend at all - it searches its own local list of known files and plays whichever matches it closest.
When linking to a "real" Spotify track, the client asks the backend to do the dirty work. There isn't a web API for this (it's in libSpotify though), but basically the backend does a few heuristics to the data* then chooses the track that matches the given data (including length) the closest.
*Basically, the track metadata is stripped to a simpler form when searching, and the album has less weighting since an artist may release the same track on multiple albums.
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