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Partial enforcer implementation for deny policy
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...y/enforcer/org.wso2.apk.enforcer/src/main/java/org/wso2/apk/enforcer/deny/DenyFilter.java
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| /* | ||
| * Copyright (c) 2023, WSO2 LLC. (http://www.wso2.com). | ||
| * | ||
| * WSO2 LLC. 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. | ||
| */ | ||
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| package org.wso2.apk.enforcer.deny; | ||
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| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
| import org.wso2.apk.enforcer.commons.Filter; | ||
| import org.wso2.apk.enforcer.commons.model.APIConfig; | ||
| import org.wso2.apk.enforcer.commons.model.RequestContext; | ||
| import org.wso2.apk.enforcer.constants.APIConstants; | ||
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| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * enum for storing types of deny policies | ||
| */ | ||
| enum DenyPolicyType { | ||
| APPLICATION, SUBSCRIPTION, USER | ||
| } | ||
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| public class DenyFilter implements Filter { | ||
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| private static final Logger logger = LogManager.getLogger(DenyFilter.class); | ||
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| // Hashmap to keep track of the blocked subs, apps and users. | ||
| private final HashMap<DenyPolicyType, ArrayList<String>> deniedDetailsMap = new HashMap<>(); | ||
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| @Override | ||
| public void init(APIConfig apiConfig, Map<String, String> configProperties) { | ||
| Filter.super.init(apiConfig, configProperties); | ||
| loadDeniedList(); | ||
| } | ||
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| /** | ||
| * | ||
| * @param requestContext {@code RequestContext} object | ||
| * @return boolean | ||
| */ | ||
| @Override | ||
| public boolean handleRequest(RequestContext requestContext) { | ||
| String username = requestContext.getAuthenticationContext().getUsername(); | ||
| String applicationId = requestContext.getAuthenticationContext().getApplicationUUID(); | ||
| String subscriptionId = requestContext.getAuthenticationContext().getSubscriber(); | ||
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| if (isInDeniedList(username, DenyPolicyType.USER) || isInDeniedList(applicationId, DenyPolicyType.APPLICATION) || | ||
| isInDeniedList(subscriptionId, DenyPolicyType.SUBSCRIPTION)) { | ||
| logger.debug("Request blocked due to deny policy (enforcer)."); | ||
| requestContext.getProperties() | ||
| .put(APIConstants.MessageFormat.STATUS_CODE, APIConstants.StatusCodes.UNAUTHORIZED.getCode()); | ||
| requestContext.getProperties().put(APIConstants.MessageFormat.ERROR_CODE, APIConstants.StatusCodes.UNAUTHORIZED.getValue()); | ||
| requestContext.getProperties().put(APIConstants.MessageFormat.ERROR_MESSAGE, APIConstants.REQUEST_DENIED_MESSAGE); | ||
| requestContext.getProperties().put(APIConstants.MessageFormat.ERROR_DESCRIPTION, APIConstants.REQUEST_DENIED_DESCRIPTION); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
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| private void loadDeniedList() { | ||
| // TODO (Gayangi): implement loading data from the database once database is implemented | ||
| deniedDetailsMap.put(DenyPolicyType.USER, new ArrayList<>()); | ||
| deniedDetailsMap.put(DenyPolicyType.APPLICATION, new ArrayList<>()); | ||
| deniedDetailsMap.put(DenyPolicyType.SUBSCRIPTION, new ArrayList<>()); | ||
| } | ||
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| /** | ||
| * | ||
| * @param value Represents the value to be checked to see if it has been blocked | ||
| * @param denyPolicyType | ||
| * @return true if value is in the relevant denied list | ||
| */ | ||
| private boolean isInDeniedList(String value, DenyPolicyType denyPolicyType) { | ||
| return deniedDetailsMap.get(denyPolicyType).contains(value); | ||
| } | ||
| } |