| /* |
| * 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.rocketmq.eventbridge.tools.pattern; |
| |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonNull; |
| import com.google.gson.JsonPrimitive; |
| import java.net.InetAddress; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.commons.net.util.SubnetUtils; |
| |
| /** |
| * The interface of all PatternCondition implementation |
| */ |
| public interface PatternCondition { |
| /** |
| * Tests the provided json element whether matches the pattern condition |
| * |
| * @param jsonData the provided json element to test |
| * @return true if match, false otherwise |
| */ |
| boolean match(JsonElement jsonData); |
| } |
| |
| abstract class AbstractPatternCondition implements PatternCondition { |
| @Override |
| public boolean match(JsonElement jsonData) { |
| if (jsonData == null) { |
| // Only ExistsCondition instance accept a null data |
| return this instanceof ExistsCondition && this.matchPrimitive(null); |
| } |
| |
| if (!check(jsonData)) { |
| return false; |
| } |
| |
| if (jsonData.isJsonPrimitive()) { |
| return matchPrimitive(jsonData.getAsJsonPrimitive()); |
| } |
| |
| if (jsonData.isJsonNull()) { |
| return matchNull(jsonData.getAsJsonNull()); |
| } |
| |
| // If the value in the event is an array, then the pattern matches if the intersection of the pattern array |
| // and the event array is non-empty. |
| for (final JsonElement element : jsonData.getAsJsonArray()) { |
| if (element.isJsonPrimitive() && matchPrimitive(element.getAsJsonPrimitive())) { |
| return true; |
| } |
| |
| if (element.isJsonNull() && matchNull(element.getAsJsonNull())) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| boolean check(JsonElement jsonData) { |
| if (jsonData.isJsonObject()) { |
| return false; |
| } |
| |
| if (jsonData.isJsonArray()) { |
| for (final JsonElement element : jsonData.getAsJsonArray()) { |
| if (!(element.isJsonPrimitive() || element.isJsonNull())) { |
| return false; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| abstract boolean matchPrimitive(JsonPrimitive jsonPrimitive); |
| |
| abstract boolean matchNull(JsonNull jsonNull); |
| } |
| |
| /** |
| * If the value is an array, then the rule pattern matches if any element matches the equal condition. |
| */ |
| class EqualCondition extends AbstractPatternCondition { |
| /** |
| * Only accept JsonPrimitive or JsonNull |
| */ |
| private final JsonElement val; |
| |
| public EqualCondition(final JsonElement val) { |
| this.val = val; |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| // JsonNull is not equal to "null" |
| if (val instanceof JsonNull) { |
| return false; |
| } |
| |
| // Number matching is at the string representation level. |
| // For example, 300, 300.0, and 3.0e2 are not considered equal. |
| return val.getAsString() |
| .equals(jsonPrimitive.getAsString()); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return val.equals(jsonNull); |
| } |
| } |
| |
| class PrefixCondition extends AbstractPatternCondition { |
| /** |
| * Don't accept null string |
| */ |
| private final String prefix; |
| |
| public PrefixCondition(final String prefix) { |
| this.prefix = prefix; |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| return jsonPrimitive.isString() && jsonPrimitive.getAsString() |
| .startsWith(prefix); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return false; |
| } |
| } |
| |
| class SuffixCondition extends AbstractPatternCondition { |
| /** |
| * Don't accept null string |
| */ |
| private final String suffix; |
| |
| public SuffixCondition(final String suffix) { |
| this.suffix = suffix; |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| return jsonPrimitive.isString() && jsonPrimitive.getAsString() |
| .endsWith(suffix); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return false; |
| } |
| } |
| |
| /** |
| * AnythingButCondition matches anything except what's provided in the rule. You can use anything-but with strings and |
| * numeric values, including lists that contain only strings, or only numbers. |
| */ |
| class AnythingButCondition extends AbstractPatternCondition { |
| private List<PatternCondition> anythingButs = new ArrayList<>(); |
| |
| public void addRuleCondition(PatternCondition patternCondition) { |
| anythingButs.add(patternCondition); |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| return matchJsonElement(jsonPrimitive); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return matchJsonElement(jsonNull); |
| } |
| |
| private boolean matchJsonElement(final JsonElement jsonElement) { |
| for (final PatternCondition condition : anythingButs) { |
| if (condition.match(jsonElement)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| |
| class NumericCondition extends AbstractPatternCondition { |
| private List<Double> dataList = new ArrayList<>(); |
| private List<NumericOperators> operatorList = new ArrayList<>(); |
| |
| public void addOperatorAndData(NumericOperators operator, double data) { |
| dataList.add(data); |
| operatorList.add(operator); |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| if (!jsonPrimitive.isNumber()) { |
| return false; |
| } |
| |
| for (int i = 0; i < operatorList.size(); i++) { |
| if (!operatorList.get(i) |
| .match(jsonPrimitive.getAsDouble(), dataList.get(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return false; |
| } |
| } |
| |
| /** |
| * IP address matching is available for both IPv4 and IPv6 addresses |
| */ |
| class CIDRCondition extends AbstractPatternCondition { |
| private final String cidrExp; |
| |
| public CIDRCondition(final String cidrExp) { |
| this.cidrExp = cidrExp; |
| } |
| |
| private boolean matchIpAddress(final String data) { |
| boolean flag; |
| try { |
| if (cidrExp.contains("/")) { |
| SubnetUtils snu = new SubnetUtils(cidrExp); |
| flag = snu.getInfo() |
| .isInRange(data); |
| } else { |
| flag = InetAddress.getByName(data) |
| .equals(InetAddress.getByName(cidrExp)); |
| } |
| } catch (Exception e) { |
| flag = false; |
| //Invalid ip address |
| } |
| return flag; |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| return jsonPrimitive.isString() && matchIpAddress(jsonPrimitive.getAsString()); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return false; |
| } |
| } |
| |
| class ExistsCondition extends AbstractPatternCondition { |
| private final boolean exists; |
| |
| ExistsCondition(final boolean exists) { |
| this.exists = exists; |
| } |
| |
| @Override |
| boolean matchPrimitive(final JsonPrimitive jsonPrimitive) { |
| return exists == (jsonPrimitive != null); |
| } |
| |
| @Override |
| boolean matchNull(final JsonNull jsonNull) { |
| return exists == (jsonNull != null); |
| } |
| } |