| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.ranger.plugin.conditionevaluator; |
| |
| import org.apache.commons.collections.CollectionUtils; |
| import org.apache.commons.collections.MapUtils; |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.ranger.plugin.contextenricher.RangerTagForEval; |
| import org.apache.ranger.plugin.policyengine.RangerAccessRequest; |
| |
| import javax.script.Bindings; |
| import javax.script.ScriptEngine; |
| import javax.script.ScriptEngineManager; |
| import javax.script.ScriptException; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class RangerScriptConditionEvaluator extends RangerAbstractConditionEvaluator { |
| private static final Log LOG = LogFactory.getLog(RangerScriptConditionEvaluator.class); |
| |
| private ScriptEngine scriptEngine; |
| |
| @Override |
| public void init() { |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> RangerScriptConditionEvaluator.init(" + condition + ")"); |
| } |
| |
| super.init(); |
| |
| String engineName = "JavaScript"; |
| |
| Map<String, String> evalOptions = conditionDef. getEvaluatorOptions(); |
| |
| if (MapUtils.isNotEmpty(evalOptions)) { |
| engineName = evalOptions.get("engineName"); |
| } |
| |
| if (StringUtils.isBlank(engineName)) { |
| engineName = "JavaScript"; |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("RangerScriptConditionEvaluator.init() - engineName=" + engineName); |
| } |
| |
| try { |
| ScriptEngineManager manager = new ScriptEngineManager(); |
| scriptEngine = manager.getEngineByName(engineName); |
| } catch (Exception exp) { |
| LOG.error("RangerScriptConditionEvaluator.init() failed with exception=" + exp); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== RangerScriptConditionEvaluator.init(" + condition + ")"); |
| } |
| } |
| |
| @Override |
| public boolean isMatched(RangerAccessRequest request) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> RangerScriptConditionEvaluator.isMatched()"); |
| } |
| boolean result = true; |
| |
| if (scriptEngine != null) { |
| |
| String script = getScript(); |
| |
| if (StringUtils.isNotBlank(script)) { |
| |
| RangerAccessRequest readOnlyRequest = request.getReadOnlyCopy(); |
| |
| RangerScriptExecutionContext context = new RangerScriptExecutionContext(readOnlyRequest); |
| RangerTagForEval currentTag = context.getCurrentTag(); |
| Map<String, String> tagAttribs = currentTag != null ? currentTag.getAttributes() : Collections.<String, String>emptyMap(); |
| |
| Bindings bindings = scriptEngine.createBindings(); |
| |
| bindings.put("ctx", context); |
| bindings.put("tag", currentTag); |
| bindings.put("tagAttr", tagAttribs); |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("RangerScriptConditionEvaluator.isMatched(): script={" + script + "}"); |
| } |
| try { |
| |
| Object ret = scriptEngine.eval(script, bindings); |
| |
| if (ret == null) { |
| ret = context.getResult(); |
| } |
| if (ret instanceof Boolean) { |
| result = (Boolean) ret; |
| } |
| |
| } catch (NullPointerException nullp) { |
| LOG.error("RangerScriptConditionEvaluator.isMatched(): eval called with NULL argument(s)", nullp); |
| |
| } catch (ScriptException exception) { |
| LOG.error("RangerScriptConditionEvaluator.isMatched(): failed to evaluate script," + |
| " exception=" + exception); |
| } |
| } |
| |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== RangerScriptConditionEvaluator.isMatched(), result=" + result); |
| } |
| |
| return result; |
| |
| } |
| |
| protected String getScript() { |
| String ret = null; |
| |
| List<String> values = condition.getValues(); |
| |
| if (CollectionUtils.isNotEmpty(values)) { |
| |
| String value = values.get(0); |
| if (StringUtils.isNotBlank(value)) { |
| ret = value.trim(); |
| } |
| } |
| |
| return ret; |
| } |
| } |