[FEATURE] InstallAuthlib support 'download-context'

ServerWrapper/src/main/java/pro/gravit/launcher/server/authlib/DownloadContextModifier.java

@@ -0,0 +1,30 @@
+package pro.gravit.launcher.server.authlib;
+
+import pro.gravit.utils.helper.LogHelper;
+import pro.gravit.utils.helper.SecurityHelper;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class DownloadContextModifier implements LibrariesHashFileModifier {
+    @Override
+    public byte[] apply(byte[] data, InstallAuthlib.InstallAuthlibContext context) throws IOException {
+        String[] lines = new String(data).split("\n");
+        for(int i=0;i<lines.length;++i) {
+            if(lines[i].contains("mojang_")) {
+                String[] separated = lines[i].split("\t");
+                Path path = context.workdir.resolve("cache").resolve(separated[2]);
+                if(Files.notExists(path)) {
+                    LogHelper.warning("Unable to find %s. Maybe you should start the server at least once?", path);
+                    return data;
+                }
+                separated[0] = SecurityHelper.toHex(SecurityHelper.digest(SecurityHelper.DigestAlgorithm.SHA256, path));
+                lines[i] = String.join("\t", separated);
+            }
+        }
+        return String.join("\n", lines).getBytes(StandardCharsets.UTF_8);
+    }
+}

ServerWrapper/src/main/java/pro/gravit/launcher/server/authlib/InstallAuthlib.java

@@ -19,6 +19,7 @@ public class InstallAuthlib {
         modifierMap = new HashMap<>();
         modifierMap.put("META-INF/libraries.list", new LibrariesLstModifier());
         modifierMap.put("patch.properties", new PatchPropertiesModifier());
+        modifierMap.put("META-INF/download-context", new DownloadContextModifier());
     }
     public void run(String... args) throws Exception {
         boolean deleteAuthlibAfterInstall = false;