u39

CompileJS.bat

@@ -1,4 +1,4 @@
 @echo off
 title gradlew generateJavascript
-gradlew generateJavascript
+call gradlew generateJavascript
 pause

EAGLERCRAFTX_README.md

@@ -196,6 +196,7 @@ The default eaglercraftXOpts values is this:
 - `eaglerNoDelay:` can be used to disable "Vigg's Algorithm", an algorithm that delays and combines multiple EaglercraftX packets together if they are sent in the same tick (does not affect regular Minecraft 1.8 packets)
 - `ramdiskMode:` if worlds and resource packs should be stored in RAM instead of IndexedDB
 - `singleThreadMode:` if the game should run the client and integrated server in the same context instead of creating a worker object
+- `enableEPKVersionCheck:` if the game should attempt to bypass the browser's cache and retry downloading assets.epk when its outdated
 - `hooks:` can be used to define JavaScript callbacks for certain events
     * `localStorageSaved:` JavaScript callback to save local storage keys (key, data)
     * `localStorageLoaded:` JavaScript callback to load local storage keys (key) returns data

resources/resources/EPKVersionIdentifier.txt

@@ -0,0 +1 @@
+u39

resources/resources/assets/eagler/boot_menu/opts_template_eaglercraftX_1_8.txt

@@ -62,5 +62,6 @@
 	"disableBlobURLs": false,
 	"eaglerNoDelay": false,
 	"ramdiskMode": false,
-	"singleThreadMode": false
+	"singleThreadMode": false,
+	"enableEPKVersionCheck": true
 }

resources/resources/assets/eagler/boot_menu/opts_template_eaglercraftX_1_8_demo.txt

@@ -62,5 +62,6 @@
 	"disableBlobURLs": false,
 	"eaglerNoDelay": false,
 	"ramdiskMode": false,
-	"singleThreadMode": false
+	"singleThreadMode": false,
+	"enableEPKVersionCheck": true
 }

resources/resources/assets/eagler/boot_menu/opts_template_eaglercraftX_1_8_html5Cursors.txt

@@ -62,5 +62,6 @@
 	"disableBlobURLs": false,
 	"eaglerNoDelay": false,
 	"ramdiskMode": false,
-	"singleThreadMode": false
+	"singleThreadMode": false,
+	"enableEPKVersionCheck": true
 }

resources/resources/assets/minecraft/lang/en_US.lang

@@ -49,6 +49,14 @@ eaglercraft.editCape.clearCape=Clear List
 
 eaglercraft.editProfile.importExport=Import/Export
 
+eaglercraft.defaultUsernameDetected.title=Default Username Detected
+eaglercraft.defaultUsernameDetected.text0=The username "%s" was auto-generated by Eaglercraft
+eaglercraft.defaultUsernameDetected.text1=It may already be taken on the largest servers
+eaglercraft.defaultUsernameDetected.text2=Would you like to pick a different username instead?
+eaglercraft.defaultUsernameDetected.changeUsername=Change Username
+eaglercraft.defaultUsernameDetected.continueAnyway=Continue Anyway
+eaglercraft.defaultUsernameDetected.doNotShow=Do not show again
+
 eaglercraft.settingsBackup.importExport.title=What do you wanna do?
 eaglercraft.settingsBackup.importExport.import=Import Profile and Settings...
 eaglercraft.settingsBackup.importExport.export=Export Profile and Settings...

src/game/java/net/minecraft/client/Minecraft.java

@@ -1394,7 +1394,7 @@ public class Minecraft implements IThreadListener {
 						int j = Mouse.getEventDWheel();
 						if (j != 0) {
 							if (this.isZoomKey) {
-								this.adjustedZoomValue = MathHelper.clamp_float(adjustedZoomValue - j * 4.0f, 5.0f,
+								this.adjustedZoomValue = MathHelper.clamp_float(adjustedZoomValue - j * 4.0f, 4.0f,
 										32.0f);
 							} else if (this.thePlayer.isSpectator()) {
 								j = j < 0 ? -1 : 1;

src/game/java/net/minecraft/client/settings/GameSettings.java

@@ -226,6 +226,7 @@ public class GameSettings {
 	public boolean enableProfanityFilter = false;
 	public boolean hasShownProfanityFilter = false;
 	public float touchControlOpacity = 1.0f;
+	public boolean hideDefaultUsernameWarning = false;
 
 	public int voiceListenRadius = 16;
 	public float voiceListenVolume = 0.5f;
@@ -1168,6 +1169,10 @@ public class GameSettings {
 						touchControlOpacity = parseFloat(astring[1]);
 					}
 
+					if (astring[0].equals("hideDefaultUsernameWarning")) {
+						this.hideDefaultUsernameWarning = astring[1].equals("true");
+					}
+
 					deferredShaderConf.readOption(astring[0], astring[1]);
 				} catch (Exception var8) {
 					logger.warn("Skipping bad option: " + s);
@@ -1315,6 +1320,7 @@ public class GameSettings {
 			printwriter.println("screenRecordGameVolume:" + this.screenRecordGameVolume);
 			printwriter.println("screenRecordMicVolume:" + this.screenRecordMicVolume);
 			printwriter.println("touchControlOpacity:" + this.touchControlOpacity);
+			printwriter.println("hideDefaultUsernameWarning:" + this.hideDefaultUsernameWarning);
 
 			for (KeyBinding keybinding : this.keyBindings) {
 				printwriter.println("key_" + keybinding.getKeyDescription() + ":" + keybinding.getKeyCode());

src/lwjgl/java/net/lax1dude/eaglercraft/v1_8/internal/PlatformInput.java

@@ -479,7 +479,11 @@ public class PlatformInput {
 	}
 
 	public static int mouseGetEventDWheel() {
-		return (int)currentMouseEvent.wheel;
+		return fixWheel(currentMouseEvent.wheel);
+	}
+
+	private static int fixWheel(float val) {
+		return (val > 0.0f ? 1 : (val < 0.0f ? -1 : 0));
 	}
 
 	public static int mouseGetX() {

src/main/java/net/lax1dude/eaglercraft/v1_8/ArrayUtils.java

@@ -61,7 +61,7 @@ public class ArrayUtils {
 	public static String hexString(byte[] bytesIn) {
 		char[] ret = new char[bytesIn.length << 1];
 		for(int i = 0; i < bytesIn.length; ++i) {
-			ret[i << 1] = hex.charAt((bytesIn[i] >> 4) & 15);
+			ret[i << 1] = hex.charAt((bytesIn[i] >>> 4) & 15);
 			ret[(i << 1) + 1] = hex.charAt(bytesIn[i] & 15);
 		}
 		return new String(ret);

src/main/java/net/lax1dude/eaglercraft/v1_8/EaglercraftVersion.java

@@ -20,10 +20,14 @@ public class EaglercraftVersion {
 	public static final String projectOriginName = "EaglercraftX";
 	public static final String projectOriginAuthor = "lax1dude";
 	public static final String projectOriginRevision = "1.8";
-	public static final String projectOriginVersion = "u38";
+	public static final String projectOriginVersion = "u39";
 	
 	public static final String projectOriginURL = "https://gitlab.com/lax1dude/eaglercraftx-1.8"; // rest in peace
-
+	
+	// EPK Version Identifier
+	
+	public static final String EPKVersionIdentifier = "u39"; // Set to null to disable EPK version check
+	
 	// Updating configuration
 
 	public static final boolean enableUpdateService = true;

src/main/java/net/lax1dude/eaglercraft/v1_8/minecraft/EaglerFolderResourcePack.java

@@ -271,6 +271,7 @@ public class EaglerFolderResourcePack extends AbstractResourcePack {
 
 	public static void loadRemoteResourcePack(String url, String hash, Consumer<EaglerFolderResourcePack> cb, Consumer<Runnable> ast, Runnable loading) {
 		if (!isSupported || !hash.matches("^[a-f0-9]{40}$")) {
+			logger.error("Invalid character in resource pack hash! (is it lowercase?)");
 			cb.accept(null);
 			return;
 		}
@@ -292,8 +293,9 @@ public class EaglerFolderResourcePack extends AbstractResourcePack {
 				digest.update(arr, 0, arr.length);
 				byte[] hashOut = new byte[20];
 				digest.doFinal(hashOut, 0);
-				if(!hash.equals(ArrayUtils.hexString(hashOut))) {
-					logger.error("Downloaded resource pack hash does not equal expected resource pack hash!");
+				String hashOutStr = ArrayUtils.hexString(hashOut);
+				if(!hash.equals(hashOutStr)) {
+					logger.error("Downloaded resource pack hash does not equal expected resource pack hash! ({} != {})", hashOutStr, hash);
 					cb.accept(null);
 					return;
 				}

src/main/java/net/lax1dude/eaglercraft/v1_8/profile/EaglerProfile.java

@@ -11,6 +11,7 @@ import net.lax1dude.eaglercraft.v1_8.EaglerInputStream;
 import net.lax1dude.eaglercraft.v1_8.EaglerOutputStream;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftUUID;
+import net.lax1dude.eaglercraft.v1_8.HString;
 import net.minecraft.client.Minecraft;
 import net.minecraft.nbt.CompressedStreamTools;
 import net.minecraft.nbt.NBTTagCompound;
@@ -493,10 +494,9 @@ public class EaglerProfile {
 		rand = new EaglercraftRandom();
 
 		do {
-			username = defaultNames[rand.nextInt(defaultNames.length)] + defaultNames[rand.nextInt(defaultNames.length)]
-					+ (100 + rand.nextInt(900));
-		} while (username.length() > 16);
-
+			username = HString.format("%s%s%04d", defaultNames[rand.nextInt(defaultNames.length)], defaultNames[rand.nextInt(defaultNames.length)], rand.nextInt(10000));
+		}while(username.length() > 16);
+		
 		setName(username);
 
 		do {
@@ -506,6 +506,11 @@ public class EaglerProfile {
 
 		presetCapeId = 0;
 		customCapeId = -1;
+		
+	}
+
+	public static boolean isDefaultUsername(String str) {
+		return str.toLowerCase().matches("^(yeeish|yee|yeer|yeeler|eagler|eagl|darver|darvler|vool|vigg|deev|yigg|yeeg){2}\\d{2,4}$");
 	}
 
 }

src/main/java/net/lax1dude/eaglercraft/v1_8/profile/GuiScreenDefaultUsernameNote.java

@@ -0,0 +1,61 @@
+package net.lax1dude.eaglercraft.v1_8.profile;
+
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.resources.I18n;
+
+/**
+ * Copyright (c) 2024 lax1dude. All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+public class GuiScreenDefaultUsernameNote extends GuiScreen {
+
+	private final GuiScreen back;
+	private final GuiScreen cont;
+
+	public GuiScreenDefaultUsernameNote(GuiScreen back, GuiScreen cont) {
+		this.back = back;
+		this.cont = cont;
+	}
+
+	public void initGui() {
+		this.buttonList.clear();
+		this.buttonList.add(new GuiButton(0, this.width / 2 - 100, this.height / 6 + 112, I18n.format("defaultUsernameDetected.changeUsername")));
+		this.buttonList.add(new GuiButton(1, this.width / 2 - 100, this.height / 6 + 142, I18n.format("defaultUsernameDetected.continueAnyway")));
+		this.buttonList.add(new GuiButton(2, this.width / 2 - 100, this.height / 6 + 172, I18n.format("defaultUsernameDetected.doNotShow")));
+	}
+
+	public void drawScreen(int par1, int par2, float par3) {
+		this.drawDefaultBackground();
+		this.drawCenteredString(fontRendererObj, I18n.format("defaultUsernameDetected.title"), this.width / 2, 70, 11184810);
+		this.drawCenteredString(fontRendererObj, I18n.format("defaultUsernameDetected.text0", EaglerProfile.getName()), this.width / 2, 90, 16777215);
+		this.drawCenteredString(fontRendererObj, I18n.format("defaultUsernameDetected.text1"), this.width / 2, 105, 16777215);
+		this.drawCenteredString(fontRendererObj, I18n.format("defaultUsernameDetected.text2"), this.width / 2, 120, 16777215);
+		super.drawScreen(par1, par2, par3);
+	}
+
+	@Override
+	protected void actionPerformed(GuiButton parGuiButton) {
+		if(parGuiButton.id == 0) {
+			this.mc.displayGuiScreen(back);
+		}else if(parGuiButton.id == 1) {
+			this.mc.displayGuiScreen(cont);
+		}else if(parGuiButton.id == 2) {
+			this.mc.gameSettings.hideDefaultUsernameWarning = true;
+			this.mc.gameSettings.saveOptions();
+			this.mc.displayGuiScreen(cont);
+		}
+	}
+
+}

src/teavm-boot-menu/java/net/lax1dude/eaglercraft/v1_8/boot_menu/teavm/BootMenuEntryPoint.java

@@ -60,12 +60,14 @@ public class BootMenuEntryPoint {
 		return ((flag & 1) != 0 || IBootMenuConfigAdapter.instance.isShowBootMenuOnLaunch()) && !getHasAlreadyBooted();
 	}
 
+	private static boolean hasInit = false;
 	private static byte[] signatureData = null;
 	private static byte[] bundleData = null;
 
 	public static void launchMenu(Window parentWindow, HTMLElement parentElement) {
 		signatureData = PlatformUpdateSvc.getClientSignatureData();
 		bundleData = PlatformUpdateSvc.getClientBundleData();
+		hasInit = true;
 		BootMenuMain.launchMenu(parentWindow, parentElement);
 	}
 
@@ -83,6 +85,11 @@ public class BootMenuEntryPoint {
 	}
 
 	public static boolean isSignedClient() {
+		if(!hasInit) {
+			signatureData = PlatformUpdateSvc.getClientSignatureData();
+			bundleData = PlatformUpdateSvc.getClientBundleData();
+			hasInit = true;
+		}
 		return signatureData != null && bundleData != null;
 	}
 

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/PlatformInput.java

@@ -597,7 +597,7 @@ public class PlatformInput {
 			public void handleEvent(WheelEvent evt) {
 				evt.preventDefault();
 				evt.stopPropagation();
-				double delta = evt.getDeltaY();
+				double delta = -evt.getDeltaY();
 				mouseDWheel += delta;
 				if(hasShownPressAnyKey) {
 					int eventX = (int)(getOffsetX(evt, touchOffsetXTeaVM) * windowDPI);
@@ -1246,7 +1246,11 @@ public class PlatformInput {
 	}
 
 	public static int mouseGetEventDWheel() {
-		return (currentEvent.type == EVENT_MOUSE_WHEEL) ? (currentEvent.wheel == 0.0f ? 0 : (currentEvent.wheel > 0.0f ? -1 : 1)) : 0;
+		return (currentEvent.type == EVENT_MOUSE_WHEEL) ? fixWheel(currentEvent.wheel) : 0;
+	}
+
+	private static int fixWheel(float val) {
+		return (val > 0.0f ? 1 : (val < 0.0f ? -1 : 0));
 	}
 
 	public static int mouseGetX() {

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/PlatformRuntime.java

@@ -5,6 +5,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -13,6 +14,7 @@ import java.util.function.Consumer;
 import net.lax1dude.eaglercraft.v1_8.EagRuntime;
 import net.lax1dude.eaglercraft.v1_8.EagUtils;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftUUID;
+import net.lax1dude.eaglercraft.v1_8.EaglercraftVersion;
 import net.lax1dude.eaglercraft.v1_8.Filesystem;
 import net.lax1dude.eaglercraft.v1_8.boot_menu.teavm.BootMenuEntryPoint;
 import org.teavm.interop.Async;
@@ -48,7 +50,6 @@ import net.lax1dude.eaglercraft.v1_8.internal.buffer.ByteBuffer;
 import net.lax1dude.eaglercraft.v1_8.internal.buffer.EaglerArrayBufferAllocator;
 import net.lax1dude.eaglercraft.v1_8.internal.buffer.FloatBuffer;
 import net.lax1dude.eaglercraft.v1_8.internal.buffer.IntBuffer;
-import net.lax1dude.eaglercraft.v1_8.internal.teavm.EPKLoader;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.ES6ShimStatus;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.EarlyLoadScreen;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.EnumES6ShimStatus;
@@ -58,8 +59,8 @@ import net.lax1dude.eaglercraft.v1_8.internal.teavm.ImmediateContinue;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.MessageChannel;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.TeaVMBlobURLManager;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.ClientMain;
-import net.lax1dude.eaglercraft.v1_8.internal.teavm.ClientMain.EPKFileEntry;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.DebugConsoleWindow;
+import net.lax1dude.eaglercraft.v1_8.internal.teavm.EPKDownloadHelper;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.TeaVMClientConfigAdapter;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.TeaVMDataURLManager;
 import net.lax1dude.eaglercraft.v1_8.internal.teavm.TeaVMEnterBootMenuException;
@@ -433,29 +434,14 @@ public class PlatformRuntime {
 		
 		EarlyLoadScreen.paintScreen(glesVer, PlatformOpenGL.checkVAOCapable(), allowBootMenu);
 		
-		EPKFileEntry[] epkFiles = ClientMain.configEPKFiles;
-
-		for (int i = 0; i < epkFiles.length; ++i) {
-			String url = epkFiles[i].url;
-			String logURL = url.startsWith("data:") ? "<data: " + url.length() + " chars>" : url;
-
-			logger.info("Downloading: {}", logURL);
-
-			ArrayBuffer epkFileData = downloadRemoteURI(url);
-
-			if (epkFileData == null) {
-				throw new RuntimeInitializationFailureException("Could not download EPK file \"" + url + "\"");
-			}
-
-			logger.info("Decompressing: {}", logURL);
-
-			try {
-				EPKLoader.loadEPK(epkFileData, epkFiles[i].path, PlatformAssets.assets);
-			} catch (Throwable t) {
-				throw new RuntimeInitializationFailureException("Could not extract EPK file \"" + url + "\"", t);
-			}
+		if(PlatformAssets.assets == null || !PlatformAssets.assets.isEmpty()) {
+			PlatformAssets.assets = new HashMap<>();
 		}
 
+		EPKDownloadHelper.downloadEPKFilesOfVersion(ClientMain.configEPKFiles,
+				teavmCfg.isEnableEPKVersionCheckTeaVM() ? EaglercraftVersion.EPKVersionIdentifier : null,
+				PlatformAssets.assets);
+
 		logger.info("Loaded {} resources from EPKs", PlatformAssets.assets.size());
 
 		if(allowBootMenu && BootMenuEntryPoint.checkShouldLaunchFlag(win)) {
@@ -613,6 +599,10 @@ public class PlatformRuntime {
 
 	}
 
+	public static boolean hasFetchSupportTeaVM() {
+		return hasFetchSupport;
+	}
+
 	public static void downloadRemoteURIByteArray(String assetPackageURI, final Consumer<byte[]> cb) {
 		downloadRemoteURI(assetPackageURI, arr -> cb.accept(TeaVMUtils.wrapByteArrayBuffer(arr)));
 	}

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/teavm/EPKDownloadHelper.java

@@ -0,0 +1,160 @@
+package net.lax1dude.eaglercraft.v1_8.internal.teavm;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Map;
+
+import org.teavm.jso.browser.Window;
+import org.teavm.jso.typedarrays.ArrayBuffer;
+
+import net.lax1dude.eaglercraft.v1_8.Base64;
+import net.lax1dude.eaglercraft.v1_8.internal.PlatformApplication;
+import net.lax1dude.eaglercraft.v1_8.internal.PlatformRuntime;
+import net.lax1dude.eaglercraft.v1_8.internal.RuntimeInitializationFailureException;
+import net.lax1dude.eaglercraft.v1_8.internal.teavm.ClientMain.EPKFileEntry;
+import net.lax1dude.eaglercraft.v1_8.log4j.LogManager;
+import net.lax1dude.eaglercraft.v1_8.log4j.Logger;
+
+/**
+ * Copyright (c) 2024 lax1dude. All Rights Reserved.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+public class EPKDownloadHelper {
+
+	private static final Logger logger = LogManager.getLogger("BrowserRuntime");
+
+	public static void downloadEPKFilesOfVersion(EPKFileEntry[] epkFiles, String expectedVersionIdentifier,
+			Map<String, byte[]> loadedFiles) {
+		byte[] bTrue = Base64.decodeBase64("true");
+		boolean oldEPKInvalidFlag = Arrays.equals(bTrue, PlatformApplication.getLocalStorage("epkInvalidFlag", false));
+		boolean epkInvalidFlag = oldEPKInvalidFlag;
+		attempt_loop: for(int a = 0; a < 3; ++a) {
+			if(a == 1 && !PlatformRuntime.hasFetchSupportTeaVM()) continue;
+			loadedFiles.clear();
+			boolean canBeInvalid = expectedVersionIdentifier != null;
+			for(int i = 0; i < epkFiles.length; ++i) {
+				boolean noCache = false;
+				String url = null;
+				switch(a) {
+				case 0:
+					url = epkFiles[i].url;
+					noCache = false;
+					break;
+				case 1:
+					logger.warn("Failed to download one or more correct/valid files, attempting to bypass the browser's cache...");
+					url = epkFiles[i].url;
+					noCache = true;
+					break;
+				case 2:
+					logger.warn("Failed to download one or more correct/valid files, attempting to bypass the server's cache...");
+					url = injectCacheInvalidationHack(epkFiles[i].url, expectedVersionIdentifier);
+					noCache = true;
+					break;
+				}
+				boolean b = url.startsWith("data:");
+				boolean c = !b && !url.startsWith("blob:");
+				String toCheck = url.indexOf("://") != -1 ? url : PlatformRuntime.win.getLocation().getFullURL();
+				boolean canBeCorrupt = c && (a < 1 || toCheck.startsWith("http:") || toCheck.startsWith("https:"));
+				canBeInvalid &= c;
+				String logURL = b ? "<data: " + url.length() + " chars>" : url;
+				
+				logger.info("Downloading: {}", logURL);
+				
+				ArrayBuffer epkFileData = PlatformRuntime.downloadRemoteURI(url, !noCache);
+				
+				if(epkFileData == null) {
+					if(a < 2 && canBeCorrupt) {
+						logger.error("Could not download EPK file \"{}\"", logURL);
+						continue attempt_loop;
+					}else {
+						throw new RuntimeInitializationFailureException("Could not download EPK file \"" + logURL + "\"");
+					}
+				}
+				
+				logger.info("Decompressing: {}", logURL);
+				
+				try {
+					EPKLoader.loadEPK(epkFileData, epkFiles[i].path, loadedFiles);
+				}catch(Throwable t) {
+					if(a < 2 && canBeCorrupt) {
+						logger.error("Could not extract EPK file \"{}\"", logURL);
+						continue attempt_loop;
+					}else {
+						throw new RuntimeInitializationFailureException("Could not extract EPK file \"" + logURL + "\"", t);
+					}
+				}
+			}
+			if(canBeInvalid) {
+				byte[] dat = loadedFiles.get("EPKVersionIdentifier.txt");
+				if(dat != null) {
+					String epkStr = (new String(dat, StandardCharsets.UTF_8)).trim();
+					if(expectedVersionIdentifier.equals(epkStr)) {
+						epkInvalidFlag = false;
+						break;
+					}
+					logger.error("EPK version identifier \"{}\" does not match the expected identifier \"{}\"", epkStr, expectedVersionIdentifier);
+				}else {
+					logger.error("Version identifier file is missing from the EPK, expecting \"{}\"", expectedVersionIdentifier);
+				}
+				if(epkInvalidFlag) {
+					break;
+				}else {
+					if(a < 2) {
+						continue;
+					}else {
+						logger.error("Nothing we can do about this, ignoring the invalid EPK version and setting invalid flag to true");
+						epkInvalidFlag = true;
+					}
+				}
+			}else {
+				epkInvalidFlag = false;
+				break;
+			}
+		}
+		if(epkInvalidFlag != oldEPKInvalidFlag) {
+			PlatformApplication.setLocalStorage("epkInvalidFlag", epkInvalidFlag ? bTrue : null, false);
+		}
+	}
+
+	private static String injectCacheInvalidationHack(String url, String cacheFixStr) {
+		if(cacheFixStr != null) {
+			cacheFixStr = Window.encodeURIComponent(cacheFixStr);
+		}else {
+			cacheFixStr = "t" + System.currentTimeMillis();
+		}
+		String toCheck = url.indexOf("://") != -1 ? url : PlatformRuntime.win.getLocation().getFullURL();
+		if(toCheck.startsWith("http:") || toCheck.startsWith("https:")) {
+			int i = url.indexOf('?');
+			if(i == url.length() - 1) {
+				return url + "eaglerCacheFix=" + cacheFixStr;
+			}else if(i != -1) {
+				String s = url.substring(i + 1);
+				if(!s.startsWith("&") && !s.startsWith("#")) {
+					s = "&" + s;
+				}
+				return url.substring(0, i + 1) + "eaglerCacheFix=" + cacheFixStr + s;
+			}else {
+				i = url.indexOf('#');
+				if(i != -1) {
+					return url.substring(0, i) + "?eaglerCacheFix=" + cacheFixStr + url.substring(i);
+				}else {
+					return url + "?eaglerCacheFix=" + cacheFixStr;
+				}
+			}
+		}else {
+			return url;
+		}
+	}
+
+}

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/teavm/TeaVMClientConfigAdapter.java

@@ -87,6 +87,7 @@ public class TeaVMClientConfigAdapter implements IClientConfigAdapter, IBootMenu
 	private boolean eaglerNoDelay = false;
 	private boolean ramdiskMode = false;
 	private boolean singleThreadMode = false;
+	private boolean enableEPKVersionCheck = true;
 
 	public void loadNative(JSObject jsObject) {
 		integratedServerOpts = new JSONObject();
@@ -134,6 +135,7 @@ public class TeaVMClientConfigAdapter implements IClientConfigAdapter, IBootMenu
 		eaglerNoDelay = eaglercraftXOpts.getEaglerNoDelay(false);
 		ramdiskMode = eaglercraftXOpts.getRamdiskMode(false);
 		singleThreadMode = eaglercraftXOpts.getSingleThreadMode(false);
+		enableEPKVersionCheck = eaglercraftXOpts.getEnableEPKVersionCheck(true);
 		JSEaglercraftXOptsHooks hooksObj = eaglercraftXOpts.getHooks();
 		if(hooksObj != null) {
 			hooks.loadHooks(hooksObj);
@@ -263,6 +265,7 @@ public class TeaVMClientConfigAdapter implements IClientConfigAdapter, IBootMenu
 		eaglerNoDelay = eaglercraftOpts.optBoolean("eaglerNoDelay", false);
 		ramdiskMode = eaglercraftOpts.optBoolean("ramdiskMode", false);
 		singleThreadMode = eaglercraftOpts.optBoolean("singleThreadMode", false);
+		enableEPKVersionCheck = eaglercraftOpts.optBoolean("enableEPKVersionCheck", true);
 		defaultServers.clear();
 		JSONArray serversArray = eaglercraftOpts.optJSONArray("servers");
 		if(serversArray != null) {
@@ -505,6 +508,10 @@ public class TeaVMClientConfigAdapter implements IClientConfigAdapter, IBootMenu
 		return singleThreadMode;
 	}
 
+	public boolean isEnableEPKVersionCheckTeaVM() {
+		return enableEPKVersionCheck;
+	}
+
 	@Override
 	public boolean isShowBootMenuOnLaunch() {
 		return showBootMenuOnLaunch;
@@ -585,6 +592,7 @@ public class TeaVMClientConfigAdapter implements IClientConfigAdapter, IBootMenu
 		jsonObject.put("eaglerNoDelay", eaglerNoDelay);
 		jsonObject.put("ramdiskMode", ramdiskMode);
 		jsonObject.put("singleThreadMode", singleThreadMode);
+		jsonObject.put("enableEPKVersionCheck", enableEPKVersionCheck);
 		JSONArray serversArr = new JSONArray();
 		for(int i = 0, l = defaultServers.size(); i < l; ++i) {
 			DefaultServer srv = defaultServers.get(i);

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/teavm/TeaVMFetchJS.java

@@ -30,7 +30,7 @@ public class TeaVMFetchJS {
 	@JSBody(params = { }, script = "return (typeof fetch === \"function\");")
 	public static native boolean checkFetchSupport();
 
-	@JSBody(params = { "uri", "forceCache", "callback" }, script = "fetch(uri, { cache: forceCache, mode: \"no-cors\" })"
+	@JSBody(params = { "uri", "forceCache", "callback" }, script = "fetch(uri, { cache: forceCache, mode: \"cors\" })"
 			+ ".then(function(res) { return res.arrayBuffer(); }).then(function(arr) { callback(arr); })"
 			+ ".catch(function(err) { console.error(err); callback(null); });")
 	public static native void doFetchDownload(String uri, String forceCache, FetchHandler callback);

src/teavm/java/net/lax1dude/eaglercraft/v1_8/internal/teavm/opts/JSEaglercraftXOptsRoot.java

@@ -171,4 +171,7 @@ public abstract class JSEaglercraftXOptsRoot implements JSObject {
 	@JSBody(params = { "def" }, script = "return (typeof this.singleThreadMode === \"boolean\") ? this.singleThreadMode : def;")
 	public native boolean getSingleThreadMode(boolean deobfStackTraces);
 
+	@JSBody(params = { "def" }, script = "return (typeof this.enableEPKVersionCheck === \"boolean\") ? this.enableEPKVersionCheck : def;")
+	public native boolean getEnableEPKVersionCheck(boolean deobfStackTraces);
+
 }