Add OAuth as authentication method to Session

Author: 0xf4b1

lib/src/main/java/xyz/gianlu/librespot/core/Session.java

@@ -71,6 +71,8 @@
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicBoolean;
 
+import static xyz.gianlu.librespot.mercury.MercuryRequests.KEYMASTER_CLIENT_ID;
+
 /**
  * @author Gianlu
  */
@@ -1001,6 +1003,21 @@ public Builder stored(@NotNull File storedCredentials) throws IOException {
             return this;
         }
 
+        /**
+         * Authenticates via OAuth flow, will prompt to open a link in the browser. This locks until completion.
+         */
+        public Builder oauth() throws IOException {
+            if (conf.storeCredentials && conf.storedCredentialsFile.exists())
+                return stored();
+
+            try (OAuth oauth = new OAuth(KEYMASTER_CLIENT_ID, "http://127.0.0.1:5588/login")) {
+                loginCredentials = oauth.flow();
+            } catch (InterruptedException ignored) {
+            }
+
+            return this;
+        }
+
         /**
          * Authenticates with your Facebook account, will prompt to open a link in the browser. This locks until completion.
          */
@@ -1034,8 +1051,11 @@ public Builder blob(@NotNull String username, byte[] blob) throws GeneralSecurit
          *
          * @param username Your Spotify username
          * @param password Your Spotify password
+         *
+         * @deprecated Use OAuth instead
          */
         @NotNull
+        @Deprecated
         public Builder userPass(@NotNull String username, @NotNull String password) {
             loginCredentials = Authentication.LoginCredentials.newBuilder()
                     .setUsername(username)