将获取验证服务器信息的代码移入AuthlibInjectorServer

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

@@ -17,7 +17,35 @@
  */
 package org.jackhuang.hmcl.auth.authlibinjector;
 
+import static org.jackhuang.hmcl.util.Lang.tryCast;
+
+import java.io.IOException;
+import java.util.Optional;
+
+import org.jackhuang.hmcl.util.JsonUtils;
+import org.jackhuang.hmcl.util.NetworkUtils;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSyntaxException;
+
 public class AuthlibInjectorServer {
+
+    public static AuthlibInjectorServer fetchServerInfo(String url) throws IOException {
+        try {
+            JsonObject response = JsonUtils.fromNonNullJson(NetworkUtils.doGet(NetworkUtils.toURL(url)), JsonObject.class);
+            String name = extractServerName(response).orElse(url);
+            return new AuthlibInjectorServer(url, name);
+        } catch (JsonSyntaxException e) {
+            throw new IOException("Malformed response", e);
+        }
+    }
+
+    private static Optional<String> extractServerName(JsonObject response){
+        return tryCast(response.get("meta"), JsonObject.class)
+                .flatMap(meta -> tryCast(meta.get("serverName"), JsonPrimitive.class).map(JsonPrimitive::getAsString));
+    }
+
     private String url;
     private String name;
 
@@ -34,6 +62,11 @@ public class AuthlibInjectorServer {
         return name;
     }
 
+    @Override
+    public String toString() {
+        return url + " (" + name + ")";
+    }
+
     @Override
     public int hashCode() {
         return url.hashCode();

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

@@ -1,51 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  huangyuhui <huanghongxun2008@126.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see {http://www.gnu.org/licenses/}.
- */
-package org.jackhuang.hmcl.auth.authlibinjector;
-
-public class AuthlibInjectorServerResponse {
-
-    private final Meta meta;
-
-    public AuthlibInjectorServerResponse() {
-        this(new Meta());
-    }
-
-    public AuthlibInjectorServerResponse(Meta meta) {
-        this.meta = meta;
-    }
-
-    public Meta getMeta() {
-        return meta;
-    }
-
-    public static class Meta {
-        private final String serverName;
-
-        public Meta() {
-            this("");
-        }
-
-        public Meta(String serverName) {
-            this.serverName = serverName;
-        }
-
-        public String getServerName() {
-            return serverName;
-        }
-    }
-}