TBMM/GCMM/MainModInstaller.cs

using GCMM.Properties;
using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GCMM
{
    partial class MainForm
    {
        public async Task InstallMod(ModInfo mod)
        {
            if (mod.DownloadURL == null) return;
            if (!File.Exists(Settings.Default.GamePath + @"\Gamecraft.exe"))
            {
                MessageBox.Show("Gamecraft not found. Set the correct path in Settings.");
                return;
            }
            var tmp = Directory.CreateDirectory("temp");
            var plugins = Directory.CreateDirectory(Settings.Default.GamePath + @"\Plugins");
            string tmppath = tmp.FullName + "\\" + mod.Name;
            using (var client = GetClient())
            {
                await client.DownloadFileTaskAsync(mod.DownloadURL, tmppath);
                string disposition = client.ResponseHeaders["Content-Disposition"];
                string filename = disposition.Substring(disposition.IndexOf("filename=") + 10).Replace("\"", "");
                if (filename.EndsWith(".dll"))
                    File.Move(tmppath, plugins.FullName + "\\" + filename);
                else if (filename.EndsWith(".zip"))
                {
                    bool pluginOnly = true;
                    using (var archive = ZipFile.OpenRead(tmppath))
                    {
                        foreach (var entry in archive.Entries)
                        {
                            if (entry.FullName == "Plugins/")
                            {
                                pluginOnly = false;
                                break;
                            }
                        }
                        archive.ExtractToDirectory(pluginOnly ? plugins.FullName : Settings.Default.GamePath, true);
                    }
                }
                else
                {
                    MessageBox.Show("Don't know how to install file: " + filename);
                    return;
                }
                GetInstalledMods(); //Update list
            }
        }
    }
}