1 files changed, 108 insertions, 0 deletions
diff --git a/VRCSDK3AvatarsLegacy/Assets/VRCSDK/Dependencies/VRChat/Editor/VRCCachedWebRequest.cs b/VRCSDK3AvatarsLegacy/Assets/VRCSDK/Dependencies/VRChat/Editor/VRCCachedWebRequest.cs
new file mode 100644
index 00000000..2dab5f97
--- /dev/null
+++ b/VRCSDK3AvatarsLegacy/Assets/VRCSDK/Dependencies/VRChat/Editor/VRCCachedWebRequest.cs
@@ -0,0 +1,108 @@
+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;
+    }
+}