2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2019 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.plugins.event.carrier.restclient;
24 import java.util.Arrays;
25 import java.util.HashSet;
27 import java.util.regex.Matcher;
28 import java.util.regex.Pattern;
29 import java.util.regex.PatternSyntaxException;
31 import javax.ws.rs.core.MultivaluedHashMap;
32 import javax.ws.rs.core.MultivaluedMap;
36 import org.apache.commons.lang3.StringUtils;
37 import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
38 import org.onap.policy.common.parameters.GroupValidationResult;
39 import org.onap.policy.common.parameters.ValidationStatus;
40 import org.onap.policy.common.utils.validation.ParameterValidationUtils;
41 import org.slf4j.Logger;
42 import org.slf4j.LoggerFactory;
46 * Apex parameters for REST as an event carrier technology with Apex as a REST client.
48 * <p>The parameters for this plugin are:
50 * <li>url: The URL that the Apex Rest client will connect to over REST for event reception or event sending. This
51 * parameter is mandatory.
52 * <li>httpMethod: The HTTP method to use when sending events over REST, legal values are POST (default) and PUT. When
53 * receiving events, the REST client plugin always uses the HTTP GET method.
54 * <li>httpHeaders, the HTTP headers to send on REST requests, optional parameter, defaults to none.
55 * <li>httpCodeFilter: a regular expression filter for returned HTTP codes, if the returned HTTP code passes this
56 * filter, then the request is assumed to have succeeded by the plugin, optional, defaults to allowing 2xx codes
57 * through, that is a regular expression of "[2][0-9][0-9]"
60 * @author Joss Armstrong (joss.armstrong@ericsson.com)
65 public class RestClientCarrierTechnologyParameters extends CarrierTechnologyParameters {
66 // Get a reference to the logger
67 private static final Logger LOGGER = LoggerFactory.getLogger(RestClientCarrierTechnologyParameters.class);
69 /** The supported HTTP methods. */
70 public enum HttpMethod {
71 GET, PUT, POST, DELETE
74 /** The label of this carrier technology. */
75 public static final String RESTCLIENT_CARRIER_TECHNOLOGY_LABEL = "RESTCLIENT";
77 /** The producer plugin class for the REST carrier technology. */
78 public static final String RESTCLIENT_EVENT_PRODUCER_PLUGIN_CLASS = ApexRestClientProducer.class.getName();
80 /** The consumer plugin class for the REST carrier technology. */
81 public static final String RESTCLIENT_EVENT_CONSUMER_PLUGIN_CLASS = ApexRestClientConsumer.class.getName();
83 /** The default HTTP code filter, allows 2xx HTTP codes through. */
84 public static final String DEFAULT_HTTP_CODE_FILTER = "[2][0-9][0-9]";
86 // Commonly occurring strings
87 private static final String HTTP_HEADERS = "httpHeaders";
88 private static final String HTTP_CODE_FILTER = "httpCodeFilter";
90 // Regular expression patterns for finding and checking keys in URLs
91 private static final Pattern patternProperKey = Pattern.compile("(?<=\\{)[^}]*(?=\\})");
92 private static final Pattern patternErrorKey =
93 Pattern.compile("(\\{[^\\{}]*.?\\{)|(\\{[^\\{}]*$)|(\\}[^\\{}]*.?\\})|(^[^\\{}]*.?\\})|\\{\\s*\\}");
95 private String url = null;
96 private HttpMethod httpMethod = null;
97 private String[][] httpHeaders = null;
98 private String httpCodeFilter = DEFAULT_HTTP_CODE_FILTER;
101 * Constructor to create a REST carrier technology parameters instance and register the instance with the parameter
104 public RestClientCarrierTechnologyParameters() {
107 // Set the carrier technology properties for the web socket carrier technology
108 this.setLabel(RESTCLIENT_CARRIER_TECHNOLOGY_LABEL);
109 this.setEventProducerPluginClass(RESTCLIENT_EVENT_PRODUCER_PLUGIN_CLASS);
110 this.setEventConsumerPluginClass(RESTCLIENT_EVENT_CONSUMER_PLUGIN_CLASS);
114 * Check if http headers have been set for the REST request.
116 * @return true if headers have been set
118 public boolean checkHttpHeadersSet() {
119 return httpHeaders != null && httpHeaders.length > 0;
123 * Gets the http headers for the REST request as a multivalued map.
125 * @return the headers
127 public MultivaluedMap<String, Object> getHttpHeadersAsMultivaluedMap() {
128 if (httpHeaders == null) {
132 // Load the HTTP headers into the map
133 MultivaluedMap<String, Object> httpHeaderMap = new MultivaluedHashMap<>();
135 for (String[] httpHeader : httpHeaders) {
136 httpHeaderMap.putSingle(httpHeader[0], httpHeader[1]);
139 return httpHeaderMap;
143 * Sets the header for the REST request.
145 * @param httpHeaders the incoming HTTP headers
147 public void setHttpHeaders(final String[][] httpHeaders) {
148 this.httpHeaders = httpHeaders;
152 * Get the tag for the REST Producer Properties.
154 * @return set of the tags
156 public Set<String> getKeysFromUrl() {
157 Matcher matcher = patternProperKey.matcher(getUrl());
158 Set<String> key = new HashSet<>();
159 while (matcher.find()) {
160 key.add(matcher.group());
169 public GroupValidationResult validate() {
170 GroupValidationResult result = super.validate();
172 result = validateUrl(result);
174 result = validateHttpHeaders(result);
176 return validateHttpCodeFilter(result);
184 * http://www.blah.com/{par1/somethingelse (Missing end tag) use {[^\\{}]*$
185 * http://www.blah.com/{par1/{some}thingelse (Nested tag) use {[^}]*{
186 * http://www.blah.com/{par1}/some}thingelse (Missing start tag1) use }[^{}]*.}
187 * http://www.blah.com/par1}/somethingelse (Missing start tag2) use }[^{}]*}
188 * http://www.blah.com/{}/somethingelse (Empty tag) use {[\s]*}
189 * @param result the result of the validation
192 private GroupValidationResult validateUrl(final GroupValidationResult result) {
193 // Check if the URL has been set for event output
194 if (getUrl() == null) {
195 result.setResult("url", ValidationStatus.INVALID, "no URL has been set for event sending on REST client");
199 Matcher matcher = patternErrorKey.matcher(getUrl());
200 if (matcher.find()) {
201 result.setResult("url", ValidationStatus.INVALID,
202 "no proper URL has been set for event sending on REST client");
209 * Validate the HTTP headers.
211 * @param result the result of the validation
213 private GroupValidationResult validateHttpHeaders(final GroupValidationResult result) {
214 if (httpHeaders == null) {
218 for (String[] httpHeader : httpHeaders) {
219 if (httpHeader == null) {
220 result.setResult(HTTP_HEADERS, ValidationStatus.INVALID, "HTTP header array entry is null");
221 } else if (httpHeader.length != 2) {
222 result.setResult(HTTP_HEADERS, ValidationStatus.INVALID,
223 "HTTP header array entries must have one key and one value: "
224 + Arrays.deepToString(httpHeader));
225 } else if (!ParameterValidationUtils.validateStringParameter(httpHeader[0])) {
226 result.setResult(HTTP_HEADERS, ValidationStatus.INVALID,
227 "HTTP header key is null or blank: " + Arrays.deepToString(httpHeader));
228 } else if (!ParameterValidationUtils.validateStringParameter(httpHeader[1])) {
229 result.setResult(HTTP_HEADERS, ValidationStatus.INVALID,
230 "HTTP header value is null or blank: " + Arrays.deepToString(httpHeader));
238 * Validate the HTTP code filter.
240 * @param result the result of the validation
242 public GroupValidationResult validateHttpCodeFilter(final GroupValidationResult result) {
243 if (httpCodeFilter == null) {
244 httpCodeFilter = DEFAULT_HTTP_CODE_FILTER;
246 } else if (StringUtils.isBlank(httpCodeFilter)) {
247 result.setResult(HTTP_CODE_FILTER, ValidationStatus.INVALID,
248 "HTTP code filter must be specified as a three digit regular expression");
251 Pattern.compile(httpCodeFilter);
252 } catch (PatternSyntaxException pse) {
254 "Invalid HTTP code filter, the filter must be specified as a three digit regular expression: "
256 result.setResult(HTTP_CODE_FILTER, ValidationStatus.INVALID, message);
257 LOGGER.debug(message, pse);
268 public String toString() {
269 return "RestClientCarrierTechnologyParameters [url=" + url + ", httpMethod=" + httpMethod + ", httpHeaders="
270 + Arrays.deepToString(httpHeaders) + ", httpCodeFilter=" + httpCodeFilter + "]";