/
EvalCommand.java
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/
EvalCommand.java
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/**
* Copyright 2015-2016 Austin Keener
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.dv8tion.discord.commands;
import net.dv8tion.discord.Permissions;
import net.dv8tion.jda.api.entities.ChannelType;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import java.util.Collections;
import java.util.List;
public class EvalCommand extends Command
{
private ScriptEngine engine;
public EvalCommand()
{
engine = new ScriptEngineManager().getEngineByName("nashorn");
try
{
engine.eval("var imports = new JavaImporter(" +
"java.io," +
"java.lang," +
"java.util," +
"Packages.net.dv8tion.jda.api," +
"Packages.net.dv8tion.jda.api.entities," +
"Packages.net.dv8tion.jda.api.entities.impl," +
"Packages.net.dv8tion.jda.api.managers," +
"Packages.net.dv8tion.jda.api.managers.impl," +
"Packages.net.dv8tion.jda.api.utils);");
}
catch (ScriptException e)
{
e.printStackTrace();
}
}
@Override
public void onCommand(MessageReceivedEvent e, String[] args)
{
//Specifically ignores the user meew0 due to a conflict between his bot (Elgyem) and Yui.
//We both agreed to make our bots ignore eachother's .eval commands.
if (e.getAuthor().getId().equals("66237334693085184")) //meew0's ID
return;
if (!Permissions.getPermissions().isOp(e.getAuthor()))
{
sendMessage(e, "Sorry, this command is OP only!");
return;
}
try
{
engine.put("event", e);
engine.put("message", e.getMessage());
engine.put("channel", e.getChannel());
engine.put("args", args);
engine.put("api", e.getJDA());
if (e.isFromType(ChannelType.TEXT))
{
engine.put("guild", e.getGuild());
engine.put("member", e.getMember());
}
Object out = engine.eval(
"(function() {" +
"with (imports) {" +
e.getMessage().getContentDisplay().substring(args[0].length()) +
"}" +
"})();");
sendMessage(e, out == null ? "Executed without error." : out.toString());
}
catch (Exception e1)
{
sendMessage(e, e1.getMessage());
}
}
@Override
public List<String> getAliases()
{
return Collections.singletonList(".eval");
}
@Override
public String getDescription()
{
return "Takes Java or Javascript and executes it.";
}
@Override
public String getName()
{
return "Evaluate";
}
@Override
public List<String> getUsageInstructions()
{
return Collections.singletonList(
".eval <Java code>\n" +
" Example: `.eval return \"5 + 5 is: \" + (5 + 5);\n" +
" This will print: 5 + 5 is: 10");
}
}