Can upload new track

ui/src/lib/track.js

@@ -46,6 +46,25 @@ export class Track {
   }
 }
 
+export async function uploadTrack(files, meta) {
+  for (const file of files) {
+    const formData = new FormData();
+    formData.append("trackfile", file);
+    formData.append("meta", JSON.stringify(meta));
+
+    const res = await fetch('/api/tracks', {
+      method: 'POST',
+      body: formData,
+    });
+    if (res.ok) {
+      const data = await res.json();
+      return new Track(data)
+    } else {
+      throw new Error((await res.json()).errmsg);
+    }
+  }
+}
+
 export async function getTracks() {
   const res = await fetch(`api/tracks`, {headers: {'Accept': 'application/json'}})
   if (res.status == 200) {