add api to get playlist tracks and just track

docs/API.md

@@ -26,6 +26,12 @@ Search for users, tracks or playlists. Query parameters are:
 
 For example: `/_/api/search?q=test&type=tracks` to search for `tracks` named `test`
 
+## GET `/_/api/track/:id`
+
+Get track by ID.
+
+For example: `/_/api/track/2014143543` to get track with ID `2014143543`
+
 ## GET `/_/api/track/:id/related`
 
 Get related tracks by ID. Pagination is supported here. Initial request returns upto 20 tracks
@@ -44,6 +50,12 @@ Get playlist by permalinks.
 
 For example: `/_/api/playlistByPermalink/lucybedroque/sets/unmusique` to get `unmusique` playlist from `lucybedroque`
 
+## GET `/_/api/playlistByPermalink/:author/sets/:playlist/tracks`
+
+Get list of track IDs in playlist.
+
+For example: `/_/api/playlistByPermalink/lucybedroque/sets/unmusique/tracks` to get all IDs of the tracks in playlist `unmusique` from `lucybedroque`
+
 # Other automation
 
 Doesn't require API to be enabled

lib/api/init.go

@@ -79,6 +79,31 @@ func Load(a *fiber.App) {
 		return c.JSON(p)
 	})
 
+	r.Get("/playlistByPermalink/:author/sets/:playlist/tracks", func(c fiber.Ctx) error {
+		p, err := sc.GetPlaylist("", c.Params("author")+"/sets/"+c.Params("playlist"))
+		if err != nil {
+			log.Printf("[API] error getting %s playlist tracks from %s: %s\n", c.Params("playlist"), c.Params("author"), err)
+			return err
+		}
+
+		tracks := make([]json.Number, len(p.Tracks))
+		for i, t := range p.Tracks {
+			tracks[i] = t.ID
+		}
+
+		return c.JSON(tracks)
+	})
+
+	r.Get("/track/:id", func(c fiber.Ctx) error {
+		t, err := sc.GetTrackByID("", c.Params("id"))
+		if err != nil {
+			log.Printf("[API] error getting track %s: %s\n", c.Params("id"), err)
+			return err
+		}
+
+		return c.JSON(t)
+	})
+
 	r.Get("/tracks", func(c fiber.Ctx) error {
 		ids := cfg.B2s(c.RequestCtx().QueryArgs().Peek("ids"))
 		t, err := sc.GetTracks("", ids)