always download missing files for server modpack

HMCL/src/main/java/org/jackhuang/hmcl/setting/AuthlibInjectorServers.java

@@ -18,6 +18,9 @@
 package org.jackhuang.hmcl.setting;
 
 import com.google.gson.JsonParseException;
+import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
+import org.jackhuang.hmcl.task.Schedulers;
+import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.util.gson.JsonUtils;
 import org.jackhuang.hmcl.util.gson.Validation;
 import org.jackhuang.hmcl.util.io.FileUtils;
@@ -30,6 +33,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.logging.Level;
 
+import static org.jackhuang.hmcl.setting.ConfigHolder.config;
 import static org.jackhuang.hmcl.util.Logging.LOG;
 
 public class AuthlibInjectorServers implements Validation {
@@ -70,6 +74,15 @@ public class AuthlibInjectorServers implements Validation {
                 LOG.log(Level.WARNING, "Malformed authlib-injectors.json", e);
             }
         }
+
+        if (ConfigHolder.isNewlyCreated() && !AuthlibInjectorServers.getConfigInstance().getUrls().isEmpty()) {
+            config().setPreferredLoginType(Accounts.getLoginType(Accounts.FACTORY_AUTHLIB_INJECTOR));
+            for (String url : AuthlibInjectorServers.getConfigInstance().getUrls()) {
+                Task.supplyAsync(Schedulers.io(), () -> AuthlibInjectorServer.locateServer(url))
+                        .thenAcceptAsync(Schedulers.javafx(), server -> config().getAuthlibInjectorServers().add(server))
+                        .start();
+            }
+        }
     }
 
     public static AuthlibInjectorServers getConfigInstance() {

HMCL/src/main/java/org/jackhuang/hmcl/setting/Settings.java

@@ -19,7 +19,6 @@ package org.jackhuang.hmcl.setting;
 
 import javafx.beans.binding.Bindings;
 import org.jackhuang.hmcl.Metadata;
-import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
 import org.jackhuang.hmcl.game.HMCLCacheRepository;
 import org.jackhuang.hmcl.util.CacheRepository;
 import org.jackhuang.hmcl.util.io.FileUtils;
@@ -45,19 +44,11 @@ public class Settings {
     }
 
     private Settings() {
-        AuthlibInjectorServers.init();
-
-        if (ConfigHolder.isNewlyCreated() && !AuthlibInjectorServers.getConfigInstance().getUrls().isEmpty()) {
-            config().setPreferredLoginType(Accounts.getLoginType(Accounts.FACTORY_AUTHLIB_INJECTOR));
-            AuthlibInjectorServers.getConfigInstance().getUrls().stream()
-                    .map(AuthlibInjectorServer::new)
-                    .forEach(config().getAuthlibInjectorServers()::add);
-        }
-
         DownloadProviders.init();
         ProxyManager.init();
         Accounts.init();
         Profiles.init();
+        AuthlibInjectorServers.init();
 
         CacheRepository.setInstance(HMCLCacheRepository.REPOSITORY);
         HMCLCacheRepository.REPOSITORY.directoryProperty().bind(Bindings.createStringBinding(() -> {

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/server/ServerModpackCompletionTask.java

@@ -113,8 +113,9 @@ public class ServerModpackCompletionTask extends Task<Void> {
                 // If old modpack does not have this entry, download it
                 download = true;
             } else if (!Files.exists(actualPath)) {
-                // If both old and new modpacks have this entry, but the file is deleted by user, leave it missing.
-                download = false;
+                // If both old and new modpacks have this entry, but the file is missing...
+                // Re-download it since network problem may cause file missing
+                download = true;
             } else {
                 // If user modified this entry file, we will not replace this file since this modified file is that user expects.
                 String fileHash = encodeHex(digest("SHA-1", Files.newInputStream(actualPath)));