109 lines
2.9 KiB
C#
109 lines
2.9 KiB
C#
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;
|
|
}
|
|
}
|