Add explicit HEAD handler for track stream that doesnt scrobble

src/server.ts

@@ -26,7 +26,7 @@ function server(
   musicService: MusicService,
   linkCodes: LinkCodes = new InMemoryLinkCodes(),
   accessTokens: AccessTokens = new AccessTokenPerAuthToken(),
-  clock: Clock = SystemClock 
+  clock: Clock = SystemClock
 ): Express {
   const app = express();
 
@@ -139,6 +139,29 @@ function server(
     </Presentation>`);
   });
 
+  app.head("/stream/track/:id", async (req, res) => {
+    const id = req.params["id"]!;
+    const accessToken = req.headers[BONOB_ACCESS_TOKEN_HEADER] as string;
+    const authToken = accessTokens.authTokenFor(accessToken);
+    if (!authToken) {
+      return res.status(401).send();
+    } else {
+      return musicService
+        .login(authToken)
+        .then((it) =>
+          it.stream({ trackId: id, range: req.headers["range"] || undefined })
+        )
+        .then((trackStream) => {
+          res.status(trackStream.status);
+          Object.entries(trackStream.headers)
+            .filter(([_, v]) => v !== undefined)
+            .forEach(([header, value]) => res.setHeader(header, value));
+
+          res.send();
+        });
+    }
+  });
+
   app.get("/stream/track/:id", async (req, res) => {
     const id = req.params["id"]!;
     const accessToken = req.headers[BONOB_ACCESS_TOKEN_HEADER] as string;