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feat: add MojangLauncher
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9 files changed

+430
-6
lines changed

9 files changed

+430
-6
lines changed

‎CmlLib.Core.Auth.Microsoft.sln‎

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‎examples/MojangLauncherTest/MojangLauncherTest.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<ItemGroup>
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<ProjectReference Include="..\..\src\CmlLib.Core.Auth.Microsoft.MojangLauncher\CmlLib.Core.Auth.Microsoft.MojangLauncher.csproj" />
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</ItemGroup>
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎examples/MojangLauncherTest/Program.cs‎

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using CmlLib.Core;
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using CmlLib.Core.Auth.Microsoft.MojangLauncher;
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var accounts = MojangLauncherAccounts.Load(MinecraftPath.GetOSDefaultPath());
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accounts.GetSessions();

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/CmlLib.Core.Auth.Microsoft.MojangLauncher.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<ItemGroup>
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<ProjectReference Include="..\CmlLib.Core.Auth.Microsoft\CmlLib.Core.Auth.Microsoft.csproj" />
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</ItemGroup>
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<PropertyGroup>
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<TargetFramework>netstandard2.1</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<LangVersion>12</LangVersion>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="System.Security.Cryptography.ProtectedData" Version="9.0.8" />
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</ItemGroup>
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</Project>

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/IsExternalInit.cs‎

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using System.ComponentModel;
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namespace System.Runtime.CompilerServices
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{
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[EditorBrowsable(EditorBrowsableState.Never)]
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internal static class IsExternalInit {} // should be internal
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}

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/MojangLauncherAccount.cs‎

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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace CmlLib.Core.Auth.Microsoft.MojangLauncher;
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public record MojangLauncherAccount(
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[property:JsonPropertyName("accessToken")] string? AccessToken,
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[property:JsonPropertyName("accessTokenExpiresAt")] string? AccessTokenExpiresAt,
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[property:JsonPropertyName("avatar")] string? Avatar,
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[property:JsonPropertyName("localId")] string? LocalId,
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[property:JsonPropertyName("minecraftProfile")] MojangLauncherMinecraftProfile? MinecraftProfile,
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[property:JsonPropertyName("remoteId")] string? RemoteId,
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[property:JsonPropertyName("type")] string? Type,
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[property:JsonPropertyName("username")] string? Username)
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{
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public static IReadOnlyList<MojangLauncherAccount> ReadFile(string path)
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{
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using var accountsFile = File.OpenRead(path);
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using var accountsDoc = JsonDocument.Parse(accountsFile);
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return accountsDoc.RootElement
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.GetProperty("accounts")
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.EnumerateObject()
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.Select(item => item.Value.Deserialize<MojangLauncherAccount>())
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.Where(item => item != null)
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.ToList()!;
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}
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}
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public record MojangLauncherMinecraftProfile(
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[property:JsonPropertyName("id")] string? Id,
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[property:JsonPropertyName("name")] string? Name
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);

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/MojangLauncherAccounts.cs‎

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namespace CmlLib.Core.Auth.Microsoft.MojangLauncher;
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public class MojangLauncherAccounts
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{
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public static MojangLauncherAccounts Load(string path)
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{
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var accountsPath = Path.Combine(path, "launcher_accounts.json");
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var accounts = MojangLauncherAccount.ReadFile(accountsPath);
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var msaCredentialsPath = Path.Combine(path, "launcher_msa_credentials.bin");
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var msaCredentials = MojangLauncherMsaCredentials.ReadEncryptedFile(msaCredentialsPath);
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return new MojangLauncherAccounts(accounts, msaCredentials);
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}
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private readonly IReadOnlyList<MojangLauncherAccount> _accounts;
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private readonly MojangLauncherMsaCredentials _msaCredentials;
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private MojangLauncherAccounts(IReadOnlyList<MojangLauncherAccount> accounts, MojangLauncherMsaCredentials msaCredentials)
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{
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_accounts = accounts;
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_msaCredentials = msaCredentials;
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}
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public void GetSessions()
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{
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foreach (var account in _accounts)
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{
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Console.WriteLine(account.AccessToken);
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Console.WriteLine(account.AccessTokenExpiresAt);
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Console.WriteLine(account.Avatar?.Length);
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Console.WriteLine(account.LocalId);
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Console.WriteLine(account.MinecraftProfile?.Id);
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Console.WriteLine(account.MinecraftProfile?.Name);
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Console.WriteLine(account.RemoteId);
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Console.WriteLine(account.Type);
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Console.WriteLine(account.Username);
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var tokens = _msaCredentials
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.Tokens
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.Where(tokens => tokens.Xuid == account.RemoteId)
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.SelectMany(tokens => tokens.Tokens)
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.Where(token => token.RelyingParty == "rp://api.minecraftservices.com");
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foreach (var token in tokens)
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{
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Console.WriteLine(token.IdentityType);
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Console.WriteLine(token.RelyingParty);
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Console.WriteLine(token.Sandbox);
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Console.WriteLine(token.TokenData.IssueInstant);
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Console.WriteLine(token.TokenData.NotAfter);
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Console.WriteLine(token.TokenData.Token);
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Console.WriteLine(token.TokenData.UserHash);
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Console.WriteLine(token.TokenType);
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}
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}
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}
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}

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/MojangLauncherMsaCredentials.cs‎

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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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namespace CmlLib.Core.Auth.Microsoft.MojangLauncher;
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public class MojangLauncherMsaCredentials
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{
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public static MojangLauncherMsaCredentials ReadEncryptedFile(string path)
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{
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var fileContent = File.ReadAllBytes(path);
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var decryptedContent = ProtectedData.Unprotect(fileContent, null, DataProtectionScope.CurrentUser);
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var json = Encoding.UTF8.GetString(decryptedContent);
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using var doc = JsonDocument.Parse(json);
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var activeUserXuid = doc.RootElement.GetProperty("activeUserXuid").GetString();
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var tokens = MsaParser.ParseFromRoot(doc.RootElement);
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return new MojangLauncherMsaCredentials
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{
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ActiveUserXuid = activeUserXuid,
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Tokens = tokens
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};
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}
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public string? ActiveUserXuid { get; set; }
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public List<MsaRetailTokens> Tokens { get; set; } = [];
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public IEnumerable<MsaRetailToken> FindTokens(string xuid, string relyingParty)
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{
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return Tokens
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.Where(tokens => tokens.Xuid == xuid)
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.SelectMany(tokens => tokens.Tokens)
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.Where(token => token.RelyingParty == relyingParty);
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}
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}

‎src/CmlLib.Core.Auth.Microsoft.MojangLauncher/MojangLauncherMsaToken.cs‎

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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace CmlLib.Core.Auth.Microsoft.MojangLauncher;
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public record MsaRetailTokens(
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string Xuid,
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IReadOnlyCollection<MsaRetailToken> Tokens
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);
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public class MsaRetailToken
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{
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[property: JsonPropertyName("IdentityType")]
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public string? IdentityType { get; set; }
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[property: JsonPropertyName("Sandbox")]
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public string? Sandbox { get; set; }
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[property: JsonPropertyName("TokenType")]
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public string? TokenType { get; set; }
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[property: JsonPropertyName("RelyingParty")]
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public string? RelyingParty { get; set; }
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[property: JsonPropertyName("TokenData")]
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public MsaRetailTokenData TokenData { get; set; } = new();
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}
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public class MsaRetailTokenData
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{
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[property: JsonPropertyName("Token")]
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public string? Token { get; set; }
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[property: JsonPropertyName("NotAfter")]
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public string? NotAfter { get; set; }
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[property: JsonPropertyName("IssueInstant")]
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public string? IssueInstant { get; set; }
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[property: JsonIgnore]
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public string? UserHash { get; set; }
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}
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public class MsaParser
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{
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public static List<MsaRetailTokens> ParseFromRoot(JsonElement root)
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{
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return root
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.GetProperty("credentials")
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.EnumerateObject()
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.Select(item =>
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{
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var xuid = item.Name;
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var tokens = item.Value.EnumerateObject()
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.Where(item => item.Name.Contains("RETAIL"))
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.SelectMany(item => ParseRetailToken(item.Value.ToString()))
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.ToList();
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return new MsaRetailTokens(xuid, tokens);
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})
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.ToList();
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}
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public static List<MsaRetailToken> ParseRetailToken(string json)
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{
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using var doc = JsonDocument.Parse(json);
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return ParseRetailToken(doc.RootElement);
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}
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public static List<MsaRetailToken> ParseRetailToken(JsonElement root)
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{
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try
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{
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return root
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.GetProperty("tokens")
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.EnumerateArray()
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.Select(element =>
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{
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var token = element.Deserialize<MsaRetailToken>();
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if (token == null)
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return null;
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try
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{
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token.TokenData.UserHash = GetUserHash(element);
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}
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catch (Exception ex)
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{
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Console.WriteLine(ex.ToString());
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}
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return token;
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})
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.Where(token => token != null)
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.ToList()!;
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}
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catch
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{
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return [];
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}
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}
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private static string GetUserHash(JsonElement token)
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{
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return token
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.GetProperty("TokenData")
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.GetProperty("DisplayClaims")
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.GetProperty("xui")
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.EnumerateArray()
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.First()
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.GetProperty("uhs")
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.ToString();
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}
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}

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