Restore FingerprintViolationEvent with appropriate THIS IS F*CKING DEAD DELET WARNINGS.

Also, notify in UI if using legacy JDK without capability to read out security data from mod jars.

Signed-off-by: cpw <cpw+github@weeksfamily.ca>

src/main/java/net/minecraftforge/fml/client/gui/screen/ModListScreen.java

@@ -31,7 +31,9 @@ import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import com.mojang.blaze3d.matrix.MatrixStack;
+import cpw.mods.modlauncher.Environment;
 import net.minecraft.util.text.*;
+import net.minecraftforge.fml.loading.FMLEnvironment;
 import org.apache.commons.lang3.tuple.Pair;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -461,8 +463,12 @@ public class ModListScreen extends Screen
         lines.add(null);
         lines.add(selectedMod.getDescription());
         lines.add(null);
-        lines.add(ForgeI18n.parseMessage("fml.menu.mods.info.signature", selectedMod.getOwningFile().getCodeSigningFingerprint().orElse(ForgeI18n.parseMessage("fml.menu.mods.info.signature.unsigned"))));
-        lines.add(ForgeI18n.parseMessage("fml.menu.mods.info.trust", selectedMod.getOwningFile().getTrustData().orElse(ForgeI18n.parseMessage("fml.menu.mods.info.trust.noauthority"))));
+        if (FMLEnvironment.secureJarsEnabled) {
+            lines.add(ForgeI18n.parseMessage("fml.menu.mods.info.signature", selectedMod.getOwningFile().getCodeSigningFingerprint().orElse(ForgeI18n.parseMessage("fml.menu.mods.info.signature.unsigned"))));
+            lines.add(ForgeI18n.parseMessage("fml.menu.mods.info.trust", selectedMod.getOwningFile().getTrustData().orElse(ForgeI18n.parseMessage("fml.menu.mods.info.trust.noauthority"))));
+        } else {
+            lines.add(ForgeI18n.parseMessage("fml.menu.mods.info.securejardisabled"));
+        }
 
         if ((vercheck.status == VersionChecker.Status.OUTDATED || vercheck.status == VersionChecker.Status.BETA_OUTDATED) && vercheck.changes.size() > 0)
         {

src/main/java/net/minecraftforge/fml/event/lifecycle/FMLFingerprintViolationEvent.java

@@ -0,0 +1,57 @@
+/*
+ * Minecraft Forge
+ * Copyright (c) 2016-2020.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.fml.event.lifecycle;
+
+import java.io.File;
+import java.util.Set;
+
+import com.google.common.collect.ImmutableSet;
+import net.minecraftforge.fml.common.Mod;
+
+
+/**
+ * DEPRECATED WITHOUT REPLACEMENT. REMOVE FROM YOUR CODE!!!
+ * IT HAS NEVER BEEN FIRED IN 1.13+ AND WILL NEVER FIRE AGAIN!!!
+ * FIRE.JPG FIRE.JPG FIRE.JPG
+ * DELET THIS
+ */
+@Deprecated
+public class FMLFingerprintViolationEvent extends ModLifecycleEvent
+{
+
+    private final boolean isDirectory;
+    private final Set<String> fingerprints;
+    private final File source;
+    private final String expectedFingerprint;
+
+    public FMLFingerprintViolationEvent(boolean isDirectory, File source, ImmutableSet<String> fingerprints, String expectedFingerprint)
+    {
+        super(null);
+        this.isDirectory = isDirectory;
+        this.source = source;
+        this.fingerprints = fingerprints;
+        this.expectedFingerprint = expectedFingerprint;
+    }
+
+    public boolean isDirectory() { return isDirectory; }
+    public Set<String> getFingerprints() { return fingerprints; }
+    public File getSource() { return source; }
+    public String getExpectedFingerprint() { return expectedFingerprint; }
+}