impl https://github.com/yushijinhun/authlib-injector/issues/85

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/authlibinjector/AuthlibInjectorServer.java

@@ -110,6 +110,7 @@ public class AuthlibInjectorServer implements Observable {
     @Nullable
     private transient String name;
     private transient Map<String, String> links = emptyMap();
+    private transient boolean nonEmailLogin;
 
     private transient boolean metadataRefreshed;
     private final transient ObservableHelper helper = new ObservableHelper(this);
@@ -145,6 +146,10 @@ public class AuthlibInjectorServer implements Observable {
         return links;
     }
 
+    public boolean isNonEmailLogin() {
+        return nonEmailLogin;
+    }
+
     public String fetchMetadataResponse() throws IOException {
         if (metadataResponse == null || !metadataRefreshed) {
             refreshMetadata();
@@ -194,6 +199,9 @@ public class AuthlibInjectorServer implements Observable {
                         return converted;
                     })
                     .orElse(emptyMap());
+            this.nonEmailLogin = metaObject.flatMap(meta -> tryCast(meta.get("feature.non_email_login"), JsonPrimitive.class))
+                    .map(it -> it.getAsBoolean())
+                    .orElse(false);
         }
     }