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using System;
using System.Collections;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;
public static class VRCCachedWebRequest
{
private const float DefaultCacheTimeHours = 24 * 7;
public static void ClearOld(float cacheLimitHours = DefaultCacheTimeHours)
{
string cacheDir = CacheDir;
if(!Directory.Exists(cacheDir))
{
return;
}
foreach(string fileName in Directory.GetFiles(cacheDir))
{
if(!(GetAge(fileName) > cacheLimitHours))
{
continue;
}
Debug.Log($"Deleting {fileName}");
File.Delete(fileName);
}
}
private static string CacheDir => Application.temporaryCachePath;
public static IEnumerator Get(string url, Action<Texture2D> onDone, float cacheLimitHours = DefaultCacheTimeHours)
{
string cacheDir = CacheDir;
if(!Directory.Exists(cacheDir))
{
Directory.CreateDirectory(cacheDir);
}
string hash = CreateHash(url);
string cache = cacheDir + "/www_" + hash;
if(File.Exists(cache))
{
// Use cached file if it exists
if(GetAge(cache) > cacheLimitHours)
{
File.Delete(cache);
}
else
{
Texture2D texture = new Texture2D(2, 2);
if(!texture.LoadImage(File.ReadAllBytes(cache)))
{
yield break;
}
// load texture from disk and exit if we successfully read it
texture.Apply();
onDone(texture);
}
}
else
{
// No cached file, load it from url
using(UnityWebRequest uwr = UnityWebRequestTexture.GetTexture(url))
{
// Wait until request and download are complete
yield return uwr.SendWebRequest();
while(!uwr.isDone || !uwr.downloadHandler.isDone)
{
yield return null;
}
var texture = DownloadHandlerTexture.GetContent(uwr);
if(string.IsNullOrEmpty(uwr.error))
{
File.WriteAllBytes(cache, uwr.downloadHandler.data);
}
onDone(texture);
}
}
}
private static string CreateHash(string input)
{
SHA256 hash = SHA256.Create();
byte[] computedHash = hash.ComputeHash(Encoding.Default.GetBytes(input));
return Uri.EscapeDataString(Convert.ToBase64String(computedHash));
}
private static double GetAge(string file)
{
if(!File.Exists(file))
{
return 0;
}
DateTime writeTime = File.GetLastWriteTimeUtc(file);
return DateTime.UtcNow.Subtract(writeTime).TotalHours;
}
}
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