From 1a427e102a952fb99c0a82bf4ae754c144c44677 Mon Sep 17 00:00:00 2001
From: Octol1ttle <l1ttleofficial@outlook.com>
Date: Sat, 28 Dec 2024 14:04:02 +0500
Subject: [PATCH] Initial commit

---
 .gitignore                  |   8 +++
 EPLMetadataGenerator.csproj |  10 ++++
 EPLMetadataGenerator.sln    |  16 ++++++
 Program.cs                  | 102 ++++++++++++++++++++++++++++++++++++
 4 files changed, 136 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 EPLMetadataGenerator.csproj
 create mode 100644 EPLMetadataGenerator.sln
 create mode 100644 Program.cs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2375bf1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+.idea/
+*.user
+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/
+/.vs/
\ No newline at end of file
diff --git a/EPLMetadataGenerator.csproj b/EPLMetadataGenerator.csproj
new file mode 100644
index 0000000..85b4959
--- /dev/null
+++ b/EPLMetadataGenerator.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
diff --git a/EPLMetadataGenerator.sln b/EPLMetadataGenerator.sln
new file mode 100644
index 0000000..d44d2ca
--- /dev/null
+++ b/EPLMetadataGenerator.sln
@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EPLMetadataGenerator", "EPLMetadataGenerator.csproj", "{91C078A4-FA5F-4A15-A8D4-1A68E04EE264}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{91C078A4-FA5F-4A15-A8D4-1A68E04EE264}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{91C078A4-FA5F-4A15-A8D4-1A68E04EE264}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{91C078A4-FA5F-4A15-A8D4-1A68E04EE264}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{91C078A4-FA5F-4A15-A8D4-1A68E04EE264}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal
diff --git a/Program.cs b/Program.cs
new file mode 100644
index 0000000..8317c32
--- /dev/null
+++ b/Program.cs
@@ -0,0 +1,102 @@
+using System.Net;
+using System.Security.Cryptography;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Xml;
+
+const string mavenMetadataUrl = "https://maven.ely.by/releases/by/ely/authlib/maven-metadata.xml";
+const string authlibInjectorUrl =
+    "https://github.com/yushijinhun/authlib-injector/releases/download/v1.2.5/authlib-injector-1.2.5.jar";
+
+var client = new HttpClient();
+var metadataXml = await client.GetStringAsync(mavenMetadataUrl);
+
+var document = new XmlDocument();
+document.LoadXml(metadataXml);
+
+var versioning = document["metadata"]!["versioning"];
+var versions = versioning!["versions"]!.GetElementsByTagName("version");
+
+var versionsDict = new Dictionary<string, string>();
+foreach (var versionObject in versions)
+{
+    var versionElement = versionObject as XmlElement;
+    var fullVersion = versionElement!.InnerText;
+    var authlibVersion = fullVersion.Split('-').First();
+    if (versionsDict.TryGetValue(authlibVersion, out var existing))
+    {
+        var newElyPatchNumber = Convert.ToInt32(fullVersion.Split('.').Last());
+        var existingElyPatchNumber = Convert.ToInt32(existing.Split('.').Last());
+        if (newElyPatchNumber > existingElyPatchNumber)
+        {
+            versionsDict.Remove(authlibVersion);
+        }
+        else
+        {
+            continue;
+        }
+    }
+
+    versionsDict.Add(authlibVersion, fullVersion);
+}
+
+versionsDict = versionsDict.OrderByDescending(kvp =>
+{
+    var versionNumbers = kvp.Key.Split('.');
+    var score = 0;
+    if (versionNumbers.Length > 0)
+    {
+        score += 1_000_000 * Convert.ToInt32(versionNumbers[0]);
+    }
+    if (versionNumbers.Length > 1)
+    {
+        score += 1_000 * Convert.ToInt32(versionNumbers[1]);
+    }
+    if (versionNumbers.Length > 2)
+    {
+        score += Convert.ToInt32(versionNumbers[2]);
+    }
+
+    return score;
+}).ToDictionary();
+
+var overrides = new JsonObject();
+foreach (var version in versionsDict)
+{
+    // TODO: replace with GitHub repo
+    var downloadUrl = $"https://llaun.ch/repo/libraries/by/ely/authlib/{version.Value}/authlib-{version.Value}.jar";
+    byte[] result;
+    try
+    {
+        result = await client.GetByteArrayAsync(downloadUrl);
+    }
+    catch (HttpRequestException e)
+    {
+        if (e.StatusCode != HttpStatusCode.NotFound) throw;
+        continue;
+    }
+
+    var sha1 = Convert.ToHexStringLower(SHA1.HashData(result));
+    var size = result.Length;
+    overrides[version.Key] = new JsonObject
+    {
+        ["url"] = downloadUrl,
+        ["sha1"] = sha1,
+        ["size"] = size
+    };
+}
+
+var root = new JsonObject
+{
+    ["overrides"] = new JsonObject
+    {
+        ["com.mojang:authlib"] = overrides
+    },
+    ["extras"] = new JsonObject
+    {
+        ["authlib-injector"] = authlibInjectorUrl
+    }
+};
+
+await using var output = File.Create("epl_metadata.json");
+await JsonSerializer.SerializeAsync(output, root, new JsonSerializerOptions { WriteIndented = true });
\ No newline at end of file