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Implement limits to image size and load times (#1790)

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* Implement limits to image size and load times
 - Prevents issues caused by users attempting to load large images
 - Implements #1729

* Check dimensions given before attempting to load image
This commit is contained in:
Jordan
2022-06-13 08:04:59 +01:00
committed by GitHub
parent 8377b0987c
commit 02a6bb9b27
4 changed files with 49 additions and 9 deletions
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35
worldedit-core/src/main/java/com/sk89q/worldedit/command/GenerationCommands.java
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@ -21,7 +21,9 @@ package com.sk89q.worldedit.command;
import com.fastasyncworldedit.core.Fawe;
import com.fastasyncworldedit.core.configuration.Caption;
import com.fastasyncworldedit.core.configuration.Settings;
import com.fastasyncworldedit.core.function.generator.CavesGen;
import com.fastasyncworldedit.core.internal.exception.FaweException;
import com.fastasyncworldedit.core.util.MainUtil;
import com.fastasyncworldedit.core.util.MaskTraverser;
import com.fastasyncworldedit.core.util.MathMan;
@ -65,6 +67,11 @@ import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.sk89q.worldedit.command.util.Logging.LogMode.ALL;
@ -587,12 +594,34 @@ public class GenerationCommands {
if (!url.getHost().equalsIgnoreCase("i.imgur.com")) {
throw new IOException("Only i.imgur.com links are allowed!");
}
BufferedImage image = MainUtil.readImage(url);
if (dimensions != null) {
image = ImageUtil.getScaledInstance(image, dimensions.getBlockX(), dimensions.getBlockZ(),
RenderingHints.VALUE_INTERPOLATION_BILINEAR, false
checkCommandArgument(
(long) dimensions.getX() * dimensions.getZ() <= Settings.settings().WEB.MAX_IMAGE_SIZE,
Caption.of("fawe.error.image-dimensions", Settings.settings().WEB.MAX_IMAGE_SIZE)
);
}
ExecutorService executor = Executors.newSingleThreadExecutor();
Future<BufferedImage> future = executor.submit(() -> {
BufferedImage image = MainUtil.readImage(url);
if (dimensions != null) {
image = ImageUtil.getScaledInstance(image, dimensions.getBlockX(), dimensions.getBlockZ(),
RenderingHints.VALUE_INTERPOLATION_BILINEAR, false
);
}
return image;
});
BufferedImage image;
try {
image = future.get(Settings.settings().WEB.MAX_IMAGE_LOAD_TIME, TimeUnit.SECONDS);
} catch (InterruptedException | TimeoutException ignored) {
actor.printError(Caption.of("fawe.web.image.load.timeout", Settings.settings().WEB.MAX_IMAGE_LOAD_TIME));
return;
} catch (Throwable t) {
if (t.getCause() instanceof FaweException faweException) {
throw faweException;
}
throw new IOException(t.getCause());
}
BlockVector3 pos1 = session.getPlacementPosition(actor);
BlockVector3 pos2 = pos1.add(image.getWidth() - 1, 0, image.getHeight() - 1);