Assets resolver

• Assets resolver
  • Get the Version Manifest Versions list
    • Convert JSON return to ProjBobcat type
  • Initialize resolver

The Assets resolver provides parsing and verification functions for game asset files. These files are generally stored in .minecraft/assets directory

Get the Version Manifest Versions list

First, you need to submit a request to https://launchermeta.mojang.com/mc/game/version_manifest.json Send an HTTP GET request.

You will see something similar to the following returned:

{
  "latest": {
    "release": "1.19.3",
    "snapshot": "23w06a"
  },
  "versions": [
    {
      "id": "23w06a",
      "type": "snapshot",
      "url": "https://piston-meta.mojang.com/v1/packages/92ed97b686fe8904d8ec00fd486c435582fd0155/23w06a.json",
      "time": "2023-02-08T15:11:06+00:00",
      "releaseTime": "2023-02-08T15:00:04+00:00"
    },
    ...
  ]
}

The Mojang server will return a JSON object, and the versions field is the Versions array we need.

Convert JSON return to ProjBobcat type

If you are using JSON.NET(Newtonsoft.JSON) in your project. You can use code similar to the following to convert the server response you get into the corresponding ProjBobcat type:

// Requesting data from the Mojang API (example, not actual code)
...
var responseJson = await res.Content.ReadAsStringAsync();

// Convert JSON response to ProjBobcat type
var manifest = JsonConvert.DeserializeObject<VersionManifest>(responseJson); 

// Get the Versions list
var versions = manifest.Versions; 

Here, versions is the Versions array required by the Assets resolver.

Initialize resolver

You can initialize the Assets resolver with the following code:

var resolver = new AssetInfoResolver
{
    AssetIndexUriRoot = "https://launchermeta.mojang.com/",
    AssetUriRoot = "https://resources.download.minecraft.net/",
    BasePath = "[GAME_ROOT_PATH]",
    VersionInfo = [SEARCHED_VERSION_INFO],
    CheckLocalFiles = [CHECK_LOCAL_FILES],
    Versions = versions // Versions array obtained in the previous step
};

In the above code block, please replace these parameters according to your actual situation:

Project	Description
[GAME_ROOT_PATH]	The game root directory, usually the path to the .minecraft folder
[SEARCHED_VERSION_INFO]	VersionInfo of the version to check (obtained via game locator)
[CHECK_LOCAL_FILES]	Check local files (if false, skip all checks)