Get lossless format list from server

server/app/serve_index.go

@@ -43,6 +43,7 @@ func serveIndex(ds model.DataStore, fs fs.FS) http.HandlerFunc {
 			"gaTrackingId":            conf.Server.GATrackingID,
 			"enableDownloads":         conf.Server.EnableDownloads,
 			"enableFavourites":        conf.Server.EnableFavourites,
+			"losslessFormats":         strings.ToUpper(strings.Join(consts.LosslessFormats, ",")),
 			"devActivityPanel":        conf.Server.DevActivityPanel,
 			"devFastAccessCoverArt":   conf.Server.DevFastAccessCoverArt,
 		}

server/app/serve_index_test.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"regexp"
 	"strconv"
+	"strings"
 
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/consts"
@@ -155,6 +156,17 @@ var _ = Describe("serveIndex", func() {
 		config := extractAppConfig(w.Body.String())
 		Expect(config).To(HaveKeyWithValue("version", consts.Version()))
 	})
+
+	It("sets the losslessFormats", func() {
+		r := httptest.NewRequest("GET", "/index.html", nil)
+		w := httptest.NewRecorder()
+
+		serveIndex(ds, fs)(w, r)
+
+		config := extractAppConfig(w.Body.String())
+		expected := strings.ToUpper(strings.Join(consts.LosslessFormats, ","))
+		Expect(config).To(HaveKeyWithValue("losslessFormats", expected))
+	})
 })
 
 var appConfigRegex = regexp.MustCompile(`(?m)window.__APP_CONFIG__="([^"]*)`)