ZhenShiXunYouJi2/Assets/Scripts/CachedWWW.cs

using System;
using System.Globalization;
using System.IO;
using System.Text;
using SUISS.Core.Crypto;
using UnityEngine;

public class CachedWWW : CustomYieldInstruction
{
	public CachedWWW(string url, int expiresInDays = 1)
	{
		this.Url = url;
		this._expiresInDays = expiresInDays;
		if (this.IsCached(url) && !this.IsExpired(url))
		{
			string str = "file://";
			url = str + this.ConvertToFilePath(url);
			this._loadFromCache = true;
		}
		this._download = new WWW(url);
	}

	public override bool keepWaiting
	{
		get
		{
			if (this._download.isDone)
			{
				if (!this._loadFromCache && this._download.error == null)
				{
					this.Save(this._download.url, this._download.bytes, this._expiresInDays);
				}
				return false;
			}
			return true;
		}
	}

	public string Url { get; private set; }

	public string Error
	{
		get
		{
			return this._download.error;
		}
	}

	public bool IsDone
	{
		get
		{
			return this._download.isDone;
		}
	}

	public Texture2D Texture
	{
		get
		{
			return this._download.texture;
		}
	}

	public Texture2D TextureNonReadable
	{
		get
		{
			return this._download.textureNonReadable;
		}
	}

	public string Text
	{
		get
		{
			return this._download.text;
		}
	}

	public AudioClip AudioClip
	{
		get
		{
			return this._download.GetAudioClip(false);
		}
	}

	private bool Save(string url, byte[] bytes, int expireInDays)
	{
		string text = this.ConvertToFilePath(url);
		try
		{
			Directory.CreateDirectory(Path.GetDirectoryName(text));
			File.WriteAllBytes(text, bytes);
		}
		catch (Exception ex)
		{
			UnityEngine.Debug.LogErrorFormat("Cannot save {0} to: {1}{2}{3}", new object[]
			{
				url,
				text,
				Environment.NewLine,
				ex.ToString()
			});
			return false;
		}
		this.SaveExpirationDate(this.GetExpirationKey(url), expireInDays);
		return true;
	}

	private bool IsCached(string url)
	{
		try
		{
			if (File.Exists(this.ConvertToFilePath(url)))
			{
				return true;
			}
		}
		catch (Exception ex)
		{
			UnityEngine.Debug.LogErrorFormat("Error checking download exists in cache: {1}{2}{3}", new object[]
			{
				this.ConvertToFilePath(url),
				Environment.NewLine,
				ex.ToString()
			});
			return false;
		}
		return false;
	}

	private string GetExpirationKey(string url)
	{
		return string.Format("EXPIRATION_DATE_KEY_{0}", this.ConvertToFileName(url));
	}

	private bool IsExpired(string url)
	{
		string expirationKey = this.GetExpirationKey(url);
		if (PlayerPrefs.HasKey(expirationKey))
		{
			bool result = true;
			string @string = PlayerPrefs.GetString(expirationKey);
			DateTime dateTime;
			if (DateTime.TryParse(@string, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
			{
				result = (dateTime.Subtract(DateTime.UtcNow).Days < 0);
			}
			return result;
		}
		return true;
	}

	private void SaveExpirationDate(string expirationKey, int expireInDays)
	{
		PlayerPrefs.SetString(expirationKey, DateTime.UtcNow.AddDays((double)expireInDays).ToString(CultureInfo.InvariantCulture));
	}

	private string ConvertToFilePath(string url)
	{
		string fileName = this.ConvertToFileName(url);
		return this.GetFilePath(fileName);
	}

	private string GetFilePath(string fileName)
	{
		return string.Format("{0}/{1}/{2}", Application.temporaryCachePath, "Cache", fileName);
	}

	private string ConvertToFileName(string url)
	{
		StringBuilder stringBuilder = new StringBuilder();
		byte[] array = Sha256.HashToBytes(new object[]
		{
			Encoding.ASCII.GetBytes(url)
		});
		int num = array.Length;
		for (int i = 0; i < num; i++)
		{
			stringBuilder.Append(array[i].ToString("x2"));
		}
		if (stringBuilder.Length >= 6)
		{
			int length = Mathf.Max(stringBuilder.Length - 9, 0);
			stringBuilder.Remove(6, length);
		}
		return stringBuilder.ToString();
	}

	private const string CacheFolderName = "Cache";

	private const string ExpirationDateKey = "EXPIRATION_DATE_KEY_{0}";

	private const int URL_KEY_ID_SIZE_A = 6;

	private const int URL_KEY_ID_SIZE_B = 3;

	private WWW _download;

	private bool _loadFromCache;

	private int _expiresInDays = -1;
}