Various resource pack fixes (#1769)

- Fixes an instance where an invalid pack_manifest file could be present
- Fixes instances where JSON files were not read as UTF-8

connector/src/main/java/org/geysermc/connector/utils/FileUtils.java

@@ -36,6 +36,7 @@ import org.reflections.util.ConfigurationBuilder;
 
 import java.io.*;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.security.MessageDigest;
 import java.util.function.Function;
@@ -62,7 +63,8 @@ public class FileUtils {
     }
 
     public static <T> T loadJson(InputStream src, Class<T> valueType) throws IOException {
-        return GeyserConnector.JSON_MAPPER.readValue(src, valueType);
+        // Read specifically with UTF-8 to allow any non-UTF-encoded JSON to read
+        return GeyserConnector.JSON_MAPPER.readValue(new InputStreamReader(src, StandardCharsets.UTF_8), valueType);
     }
 
     /**

connector/src/main/java/org/geysermc/connector/utils/ResourcePack.java

@@ -77,12 +77,15 @@ public class ResourcePack {
                         if (x.getName().contains("manifest.json")) {
                             try {
                                 ResourcePackManifest manifest = FileUtils.loadJson(zip.getInputStream(x), ResourcePackManifest.class);
-
+                                // Sometimes a pack_manifest file is present and not in a valid format,
+                                // but a manifest file is, so we null check through that one
+                                if (manifest.getHeader().getUuid() != null) {
                                     pack.file = file;
                                     pack.manifest = manifest;
                                     pack.version = ResourcePackManifest.Version.fromArray(manifest.getHeader().getVersion());
 
                                     PACKS.put(pack.getManifest().getHeader().getUuid().toString(), pack);
+                                }
                             } catch (Exception e) {
                                 e.printStackTrace();
                             }