Add SHA256 digest to cached file name

Fixes caching failure when URL is too long (e.g. discord hosted ones).
Fixes illegal characters on Windows (namely '\') that can show up in base64.

src/main/java/me/srrapero720/watermedia/api/cache/CacheAPI.java

@@ -3,11 +3,15 @@
 import me.srrapero720.watermedia.WaterMedia;
 import me.srrapero720.watermedia.api.WaterMediaAPI;
 import me.srrapero720.watermedia.loaders.ILoader;
+import me.srrapero720.watermedia.tools.IOTool;
 import org.apache.logging.log4j.Marker;
 import org.apache.logging.log4j.MarkerManager;
 
 import java.io.*;
 import java.nio.file.Files;
+import java.security.NoSuchAlgorithmException;
+import java.security.MessageDigest;
+import java.nio.charset.StandardCharsets;
 import java.util.Base64;
 import java.util.HashMap;
 import java.util.Map;
@@ -134,6 +138,12 @@ private static boolean updateIndex() {
     }
 
     static File entry$getFile(String url) {
-        return new File(dir, Base64.getEncoder().encodeToString(url.getBytes()));
+		try {
+			MessageDigest digest = MessageDigest.getInstance("SHA-256");
+			return new File(dir, IOTool.encodeHexString(digest.digest(url.getBytes(StandardCharsets.UTF_8))));
+		} catch (NoSuchAlgorithmException e) { LOGGER.error(IT, "Failed to initalize digest", e); }
+
+		// Fallback to old naming
+		return new File(dir, Base64.getEncoder().encodeToString(url.getBytes()));
     }
-}
+}

src/main/java/me/srrapero720/watermedia/tools/IOTool.java

@@ -105,4 +105,15 @@ public static void unzip(Marker it, Path zipFilePath, Path destDirectory) throws
             while ((read = zipIn.read(bytesIn)) != -1) output.write(bytesIn, 0, read);
         }
     }
+
+    private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
+    public static String encodeHexString(byte[] bytes) {
+        char[] hexChars = new char[bytes.length * 2];
+        for (int j = 0; j < bytes.length; j++) {
+            int v = bytes[j] & 0xFF;
+            hexChars[j * 2] = HEX_ARRAY[v >>> 4];
+            hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
+        }
+        return new String(hexChars);
+    }
 }