73 lines
2.2 KiB
C#
73 lines
2.2 KiB
C#
using KbinXml.Net;
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using Medusa.Core.Utils;
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using System.Security.Cryptography;
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using System.Text;
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using System.Xml.Linq;
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namespace Medusa.Core.Middlewares
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{
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public class BodyParsingMiddleware(RequestDelegate next)
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{
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static readonly byte[] Key =
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Convert.FromHexString("00000000000069D74627D985EE2187161570D08D93B12455035B6DF0D8205DF5");
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private readonly RequestDelegate _next = next;
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public async Task Invoke(HttpContext context)
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{
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if(context.Request.Method == "GET")
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{
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await _next(context);
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return;
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}
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var body = await ParseRequest(context);
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context.Items["Encoding"] = body.Declaration.Encoding;
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var bodyString = body.ToString();
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context.Request.Body = new MemoryStream(Encoding.GetEncoding(932).GetBytes(bodyString));
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await _next(context);
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}
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public async Task<XDocument> ParseRequest(HttpContext context)
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{
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var isCompressed = context.Request.Headers["X-Compress"].ToString().Contains("lz77");
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var info = context.Request.Headers["X-Eamuse-Info"].FirstOrDefault();
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var contentLength = context.Request.Headers.ContentLength ?? 0;
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byte[] data = new byte[(int)contentLength];
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await context.Request.Body.ReadAsync(data.AsMemory(0, (int)contentLength));
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if(info is not null)
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{
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string[] infoParts = info.Split('-');
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for(int i = 0; i < 6; i++)
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{
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Key[i] = Convert.ToByte((infoParts[1] + infoParts[2]).Substring(i << 1, 2), 0x10);
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}
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byte[] rc4Key = MD5.HashData(Key);
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data = RC4.Decrypt(rc4Key, data);
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}
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if(isCompressed)
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{
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data = LZ77.Decompress(data);
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}
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var returnData = new XDocument();
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try
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{
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returnData = KbinConverter.ReadXmlLinq(data);
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} catch (Exception e)
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{
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Console.WriteLine(e);
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}
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//Data is now xml in konami binary form
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return returnData;
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}
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}
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}
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