Unity3D AssetStore 外部工具下载

参考https://www.jianshu.com/p/3ceb18e69d11

Unity 商店更新后还是没有很好得解决下载资源失败从头再来得问题。只好查找如何离线下载得文章，在简书上有一篇16年得文章利用反射机制调用编辑器解密下载文件得方法，但是因为unity得升级，该方法已经从AssetStoreUtils类里移除了。

解决方案

既然已经删除了DecryptFile函数，那反射肯定不行，那是不是可以从反编译得角度出发，找到该函数得实现方式，来直接解压。

资料查找

// 参考文档
https://github.com/jamesjlinden/unity-decompiled

实现

// 参考文档
//https://github.com/jamesjlinden/unity-decompiled
using UnityEditor;
using System;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;class DecryptUtility
{[MenuItem("Utility/DecryptFile")]static void DecryptFile(){var inputFile = @"D:\2223333";var key = "11122222";//var unityEditor = typeof(Editor).Assembly;//var assetStoreUtils = unityEditor.GetType("UnityEditor.AssetStoreUtils");//assetStoreUtils.Invoke("DecryptFile", inputFile, inputFile + ".unitypackage", key);DecryptFile(inputFile, inputFile + ".unitypackage", key);}private static void HexStringToByteArray(string hex, byte[] array, int offset){if (offset + array.Length * 2 > hex.Length)throw new ArgumentException("Hex string too short");for (int index = 0; index < array.Length; ++index){string s = hex.Substring(index * 2 + offset, 2);array[index] = byte.Parse(s, NumberStyles.HexNumber);}}public static void DecryptFile(string inputFile, string outputFile, string keyIV){byte[] array1 = new byte[32];byte[] array2 = new byte[16];HexStringToByteArray(keyIV, array1, 0);HexStringToByteArray(keyIV, array2, 64);EditorUtility.DisplayProgressBar("Decrypting", "Decrypting package", 0.0f);FileStream fileStream1 = File.Open(inputFile, System.IO.FileMode.Open);FileStream fileStream2 = File.Open(outputFile, System.IO.FileMode.CreateNew);long length = fileStream1.Length;long num = 0;AesManaged aesManaged = new AesManaged();aesManaged.Key = array1;aesManaged.IV = array2;CryptoStream cryptoStream = new CryptoStream((Stream)fileStream1, aesManaged.CreateDecryptor(aesManaged.Key, aesManaged.IV), CryptoStreamMode.Read);try{byte[] numArray = new byte[40960];int count;while ((count = cryptoStream.Read(numArray, 0, numArray.Length)) > 0){fileStream2.Write(numArray, 0, count);num += (long)count;if (EditorUtility.DisplayCancelableProgressBar("Decrypting", "Decrypting package", (float)num / (float)length))throw new Exception("User cancelled decryption");}}finally{cryptoStream.Close();fileStream1.Close();fileStream2.Close();EditorUtility.ClearProgressBar();}}
}

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Unity3D AssetStore 外部工具下载

参考https://www.jianshu.com/p/3ceb18e69d11

解决方案

资料查找

实现

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