Add option to skip language download on startup

common/src/main/java/com/loohp/imageframe/ImageFrame.java

@@ -97,6 +97,8 @@ public class ImageFrame extends JavaPlugin {
 
     public static String language;
 
+    public static boolean downloadLanguagesOnStartup;
+
     public static SimpleDateFormat dateFormat;
 
     public static String mapItemFormat;
@@ -325,6 +327,7 @@ public void reloadConfig() {
         viaDisableSmoothAnimationForLegacyPlayers = config.getConfiguration().getBoolean("Hooks.ViaVersion.DisableSmoothAnimationForLegacyPlayers");
 
         language = config.getConfiguration().getString("Settings.Language");
+        downloadLanguagesOnStartup = config.getConfiguration().getBoolean("Settings.DownloadLanguagesOnStartup");
 
         dateFormat = new SimpleDateFormat(config.getConfiguration().getString("Settings.DateFormat"));
 

common/src/main/java/com/loohp/imageframe/language/LanguageManager.java

@@ -78,6 +78,10 @@ public Set<String> getLoadedLanguages() {
     }
 
     public void downloadTranslations() {
+        if (!ImageFrame.downloadLanguagesOnStartup) {
+            ImageFrame.plugin.getLogger().info("DownloadLanguagesOnStartup is disabled. Skipped downloading language files from the internet; using the locally installed language files.");
+            return;
+        }
         try {
             File languageHashFile = new File(ImageFrame.plugin.getDataFolder(), "language_hashes.json");
             JsonObject languageHashes;
@@ -129,6 +133,7 @@ public void downloadTranslations() {
                 new IOException("Unable to save language hashes to " + languageHashFile.getAbsolutePath(), e).printStackTrace();
             }
         } catch (Throwable e) {
+            ImageFrame.plugin.getLogger().warning("Failed to fetch language files from the internet. The plugin will use the locally installed language files. If your server cannot reach api.loohpjames.com, or you intend to run it offline, set \"Settings.DownloadLanguagesOnStartup\" to false in config.yml to skip this network request on startup.");
             e.printStackTrace();
         }
     }

common/src/main/resources/config.yml

@@ -4,6 +4,10 @@ Settings:
   #For supported languages, see https://loohpjames.com/imageframe/languages/
   #To contribute your language, visit https://crowdin.com/project/imageframe/
   Language: "en_us"
+  #Whether ImageFrame should look for updated language files from the internet on startup
+  #Set to false to skip the network request and only use the locally installed language files
+  #Useful if the server cannot reach api.loohpjames.com, or you intend to run the server offline
+  DownloadLanguagesOnStartup: true
   #Date format used where a time based variable is displayed
   DateFormat: "dd/MM/yyyy HH:mm:ss zzz"
   MapItemFormat: "&f{Name} &7({X}, {Y})"