Make URL configurable in REST Requestor/Client

Change-Id: Ifb9870636996d1af786f05fcef7aa811d6f57532
Issue-ID: POLICY-1743
Signed-off-by: ning.xi <ning.xi@est.tech>

2 files changed, 72 insertions, 9 deletions

diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/ApexRestClientProducer.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/ApexRestClientProducer.java
index 6739d82a9..822ac46a2 100644
--- a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/ApexRestClientProducer.java
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/ApexRestClientProducer.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2019 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +24,9 @@ package org.onap.policy.apex.plugins.event.carrier.restclient;
 import java.util.EnumMap;
 import java.util.Map;
 import java.util.Properties;
+import java.util.Set;
+import java.util.Optional;
+import java.util.concurrent.atomic.AtomicReference;
 
 import javax.ws.rs.client.Client;
 import javax.ws.rs.client.ClientBuilder;
@@ -36,6 +40,8 @@ import org.onap.policy.apex.service.engine.event.PeeredReference;
 import org.onap.policy.apex.service.engine.event.SynchronousEventCache;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
+import org.onap.policy.common.parameters.GroupValidationResult;
+import org.onap.policy.common.parameters.ParameterException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -134,12 +140,28 @@ public class ApexRestClientProducer implements ApexEventProducer {
             synchronousEventCache.removeCachedEventToApexIfExists(executionId);
         }
 
+        String untaggedUrl = restProducerProperties.getUrl();
+        if (executionProperties != null) {
+            Set<String> names = restProducerProperties.getKeysFromUrl();
+            Set<String> inputProperty = executionProperties.stringPropertyNames();
+
+            names.stream().map(key -> Optional.of(key)).forEach(op -> {
+                op.filter(str -> inputProperty.contains(str))
+                    .orElseThrow(() -> new ApexEventRuntimeException(
+                        "key\"" + op.get() + "\"specified on url \"" + restProducerProperties.getUrl() +
+                        "\"not found in execution properties passed by the current policy"));
+            });
+
+            untaggedUrl = names.stream().reduce(untaggedUrl,
+                (acc, str) -> acc.replace("{" + str + "}", (String) executionProperties.get(str)));
+        }
+
         // Send the event as a REST request
-        final Response response = sendEventAsRestRequest((String) event);
+        final Response response = sendEventAsRestRequest(untaggedUrl, (String) event);
 
         // Check that the request worked
         if (response.getStatus() != Response.Status.OK.getStatusCode()) {
-            final String errorMessage = "send of event to URL \"" + restProducerProperties.getUrl() + "\" using HTTP \""
+            final String errorMessage = "send of event to URL \"" + untaggedUrl + "\" using HTTP \""
                     + restProducerProperties.getHttpMethod() + "\" failed with status code " + response.getStatus()
                     + " and message \"" + response.readEntity(String.class) + "\", event:\n" + event;
             LOGGER.warn(errorMessage);
@@ -148,7 +170,7 @@ public class ApexRestClientProducer implements ApexEventProducer {
 
         if (LOGGER.isTraceEnabled()) {
             LOGGER.trace("event sent from engine using {} to URL {} with HTTP {} : {} and response {} ", this.name,
-                    restProducerProperties.getUrl(), restProducerProperties.getHttpMethod(), event, response);
+                untaggedUrl, restProducerProperties.getHttpMethod(), event, response);
         }
     }
 
@@ -167,13 +189,13 @@ public class ApexRestClientProducer implements ApexEventProducer {
      * @param event the event to send
      * @return the response to the JSON request
      */
-    private Response sendEventAsRestRequest(final String event) {
+    private Response sendEventAsRestRequest(final String untaggedUrl, final String event) {
         // We have already checked that it is a PUT or POST request
         if (RestClientCarrierTechnologyParameters.HttpMethod.POST.equals(restProducerProperties.getHttpMethod())) {
-            return client.target(restProducerProperties.getUrl()).request("application/json")
+            return client.target(untaggedUrl).request("application/json")
                     .headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).post(Entity.json(event));
         } else {
-            return client.target(restProducerProperties.getUrl()).request("application/json")
+            return client.target(untaggedUrl).request("application/json")
                     .headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).put(Entity.json(event));
         }
     }
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/RestClientCarrierTechnologyParameters.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/RestClientCarrierTechnologyParameters.java
index 258c01d3f..ca0084982 100644
--- a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/RestClientCarrierTechnologyParameters.java
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-restclient/src/main/java/org/onap/policy/apex/plugins/event/carrier/restclient/RestClientCarrierTechnologyParameters.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2019 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,10 +22,12 @@
 package org.onap.policy.apex.plugins.event.carrier.restclient;
 
 import java.util.Arrays;
-
+import java.util.HashSet;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import javax.ws.rs.core.MultivaluedHashMap;
 import javax.ws.rs.core.MultivaluedMap;
-
 import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
 import org.onap.policy.common.parameters.GroupValidationResult;
 import org.onap.policy.common.parameters.ValidationStatus;
@@ -64,6 +67,9 @@ public class RestClientCarrierTechnologyParameters extends CarrierTechnologyPara
     private String url = null;
     private HttpMethod httpMethod = null;
     private String[][] httpHeaders = null;
+    private static final Pattern patternProperKey = Pattern.compile("(?<=\\{)[^}]*(?=\\})");
+    private static final Pattern patternErrorKey = Pattern.compile(
+        "(\\{[^\\{}]*.?\\{)|(\\{[^\\{}]*$)|(\\}[^\\{}]*.?\\})|(^[^\\{}]*.?\\})|\\{\\s*\\}");
 
     /**
      * Constructor to create a REST carrier technology parameters instance and register the instance with the parameter
@@ -163,6 +169,36 @@ public class RestClientCarrierTechnologyParameters extends CarrierTechnologyPara
     }
 
     /**
+     * Get the tag for the REST Producer Properties.
+     *
+     * @return set of the tags
+     */
+    public Set<String> getKeysFromUrl() {
+        Matcher matcher = patternProperKey.matcher(this.url);
+        Set<String> key = new HashSet<>();
+        while (matcher.find()) {
+            key.add(matcher.group());
+        }
+        return key;
+    }
+
+    /**
+     * Validate tags in url.
+     * http://www.blah.com/{par1/somethingelse (Missing end tag) use  {[^\\{}]*$
+     * http://www.blah.com/{par1/{some}thingelse (Nested tag) use {[^}]*{
+     * http://www.blah.com/{par1}/some}thingelse (Missing start tag1) use }[^{}]*.}
+     * http://www.blah.com/par1}/somethingelse (Missing start tag2) use }[^{}]*}
+     * http://www.blah.com/{}/somethingelse (Empty tag) use {[\s]*}
+     *
+     * @return if url is legal
+     */
+    public boolean validateTagInUrl() {
+        // Check url tag syntax error
+        Matcher matcher = patternErrorKey.matcher(this.url);
+        return (!matcher.find());
+    }
+
+    /**
      * {@inheritDoc}.
      */
     @Override
@@ -171,7 +207,8 @@ public class RestClientCarrierTechnologyParameters extends CarrierTechnologyPara
 
         // Check if the URL has been set for event output
         if (getUrl() == null) {
-            result.setResult("url", ValidationStatus.INVALID, "no URL has been set for event sending on REST client");
+            result.setResult("url", ValidationStatus.INVALID,
+                "no URL has been set for event sending on REST client");
         }
 
         if (httpHeaders == null) {
@@ -194,6 +231,10 @@ public class RestClientCarrierTechnologyParameters extends CarrierTechnologyPara
             }
         }
 
+        if (!validateTagInUrl()) {
+            result.setResult("url", ValidationStatus.INVALID,
+                    "no proper URL has been set for event sending on REST client");
+        }
         return result;
     }