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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.plan.a;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.SpecialPermission;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.script.CompiledScript;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.LeafSearchScript;
import org.elasticsearch.script.ScriptEngineService;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.lookup.SearchLookup;
import java.io.IOException;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.Permissions;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.HashMap;
import java.util.Map;
public class PlanAScriptEngineService extends AbstractComponent implements ScriptEngineService {
public static final String NAME = "plan-a";
// default settings, used unless otherwise specified
private static final CompilerSettings DEFAULT_COMPILER_SETTINGS = new CompilerSettings();
public static final String NUMERIC_OVERFLOW = "numeric_overflow";
// TODO: how should custom definitions be specified?
private Definition definition = null;
@Inject
public PlanAScriptEngineService(Settings settings) {
super(settings);
}
public void setDefinition(final Definition definition) {
this.definition = new Definition(definition);
}
@Override
public String[] types() {
return new String[] { NAME };
}
@Override
public String[] extensions() {
return new String[] { NAME };
}
@Override
public boolean sandboxed() {
return true;
}
// context used during compilation
private static final AccessControlContext COMPILATION_CONTEXT;
static {
Permissions none = new Permissions();
none.setReadOnly();
COMPILATION_CONTEXT = new AccessControlContext(new ProtectionDomain[] {
new ProtectionDomain(null, none)
});
}
@Override
public Object compile(String script, Map<String, String> params) {
final CompilerSettings compilerSettings;
if (params.isEmpty()) {
compilerSettings = DEFAULT_COMPILER_SETTINGS;
} else {
// custom settings
compilerSettings = new CompilerSettings();
Map<String,String> clone = new HashMap<>(params);
String value = clone.remove(NUMERIC_OVERFLOW);
if (value != null) {
// TODO: can we get a real boolean parser in here?
compilerSettings.setNumericOverflow(Boolean.parseBoolean(value));
}
if (!clone.isEmpty()) {
throw new IllegalArgumentException("Unrecognized compile-time parameter(s): " + clone);
}
}
// check we ourselves are not being called by unprivileged code
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new SpecialPermission());
}
// create our loader (which loads compiled code with no permissions)
Compiler.Loader loader = AccessController.doPrivileged(new PrivilegedAction<Compiler.Loader>() {
@Override
public Compiler.Loader run() {
return new Compiler.Loader(getClass().getClassLoader());
}
});
// drop all permissions to actually compile the code itself
return AccessController.doPrivileged(new PrivilegedAction<Executable>() {
@Override
public Executable run() {
return Compiler.compile(loader, "something", script, definition, compilerSettings);
}
}, COMPILATION_CONTEXT);
}
@Override
public ExecutableScript executable(CompiledScript compiledScript, Map<String,Object> vars) {
return new ScriptImpl((Executable) compiledScript.compiled(), vars, null);
}
@Override
public SearchScript search(CompiledScript compiledScript, SearchLookup lookup, Map<String,Object> vars) {
return new SearchScript() {
@Override
public LeafSearchScript getLeafSearchScript(LeafReaderContext context) throws IOException {
return new ScriptImpl((Executable) compiledScript.compiled(), vars, lookup.getLeafSearchLookup(context));
}
@Override
public boolean needsScores() {
return true; // TODO: maybe even do these different and more like expressions.
}
};
}
@Override
public void scriptRemoved(CompiledScript script) {
// nothing to do
}
@Override
public void close() throws IOException {
// nothing to do
}
}
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