Only apply OAuth token to requests from OAuth-enabled clients.

common/src/main/java/dev/lavalink/youtube/YoutubeAudioSourceManager.java

@@ -212,6 +212,7 @@ protected AudioItem loadItemOnce(@NotNull AudioReference reference) {
                 }
 
                 log.debug("Attempting to load {} with client \"{}\"", reference.identifier, client.getIdentifier());
+                httpInterface.getContext().setAttribute(Client.OAUTH_CLIENT_ATTRIBUTE, client.supportsOAuth());
 
                 try {
                     AudioItem item = router.route(client);

common/src/main/java/dev/lavalink/youtube/clients/TvHtml5Embedded.java

@@ -105,6 +105,11 @@ public boolean canHandleRequest(@NotNull String identifier) {
         return (!identifier.contains("list=") || identifier.contains("list=RD")) && super.canHandleRequest(identifier);
     }
 
+    @Override
+    public boolean supportsOAuth() {
+        return true;
+    }
+
     @Override
     @NotNull
     public String getIdentifier() {

common/src/main/java/dev/lavalink/youtube/clients/skeleton/Client.java

@@ -25,6 +25,8 @@
  * The interface for a Client.
  */
 public interface Client {
+    String OAUTH_CLIENT_ATTRIBUTE = "yt-oauth-enabled-client";
+
     String WATCH_URL = "https://www.youtube.com/watch?v=";
     String API_BASE_URL = "https://youtubei.googleapis.com/youtubei/v1";
     String PLAYER_URL = API_BASE_URL + "/player?prettyPrint=false";
@@ -208,6 +210,13 @@ default boolean isEmbedded() {
         return false;
     }
 
+    /**
+     * @return True, if this client supports account linking via OAuth (i.e. TV)
+     */
+    default boolean supportsOAuth() {
+        return false;
+    }
+
     void setPlaylistPageCount(int count);
 
     /**

common/src/main/java/dev/lavalink/youtube/http/YoutubeHttpContextFilter.java

@@ -3,6 +3,7 @@
 import com.sedmelluq.discord.lavaplayer.tools.FriendlyException;
 import com.sedmelluq.discord.lavaplayer.tools.http.HttpContextRetryCounter;
 import com.sedmelluq.discord.lavaplayer.tools.io.HttpClientTools;
+import dev.lavalink.youtube.clients.skeleton.Client;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.CookieStore;
 import org.apache.http.client.methods.HttpUriRequest;
@@ -79,7 +80,12 @@ public void onRequest(HttpClientContext context,
         context.removeAttribute(ATTRIBUTE_USER_AGENT_SPECIFIED);
       }
 
-      oauth2Handler.applyToken(request);
+      boolean isRequestFromOauthedClient = context.getAttribute(Client.OAUTH_CLIENT_ATTRIBUTE) == Boolean.TRUE;
+
+      if (isRequestFromOauthedClient && Client.PLAYER_URL.equals(request.getURI().toString())) {
+        // only apply the token to /player requests.
+        oauth2Handler.applyToken(request);
+      }
     }
 
 //    try {

common/src/main/java/dev/lavalink/youtube/http/YoutubeOauth2Handler.java

@@ -259,10 +259,6 @@ public void applyToken(HttpUriRequest request) {
             return;
         }
 
-        if (!Client.PLAYER_URL.equals(request.getURI().toString())) {
-            return;
-        }
-
         if (shouldRefreshAccessToken()) {
             log.debug("Access token has expired, refreshing...");
 

common/src/main/java/dev/lavalink/youtube/track/YoutubeAudioTrack.java

@@ -68,6 +68,8 @@ public void process(LocalAudioTrackExecutor localExecutor) throws Exception {
           continue;
         }
 
+        httpInterface.getContext().setAttribute(Client.OAUTH_CLIENT_ATTRIBUTE, client.supportsOAuth());
+
         try {
           processWithClient(localExecutor, httpInterface, client, 0);
           return; // stream played through successfully, short-circuit.