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/*-
* ============LICENSE_START=======================================================
* ONAP Policy Engine
* ================================================================================
* Copyright (C) 2018 Ericsson Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.brms.api.nexus;
import com.google.gson.Gson;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Invocation.Builder;
import javax.ws.rs.core.Response;
import org.onap.policy.brms.api.nexus.pojo.NexusArtifact;
import org.onap.policy.brms.api.nexus.pojo.NexusRepository;
import org.onap.policy.brms.api.nexus.pojo.NexusSearchResult;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
/**
* The Class NexusRestWrapper provides a Java API to a Nexus repository, wrapping the Nexus REST interface.
*/
public class NexusRestWrapper {
private static final Logger LOGGER = FlexLogger.getLogger(NexusRestWrapper.class.getName());
// A web client for issuing REST requests to the Nexus server
private final Client client;
// The URL of the Nexus server
private final String nexusServerUrl;
// Credentials for Nexus server logins
private String nexusUser;
private String nexusPassword;
/**
* Instantiates a new Nexus REST agent.
*
* @param nexusServerUrl the URL of the Nexus server as a string
* @throws NexusRestWrapperException on errors on the Nexus server URL
*/
public NexusRestWrapper(final String nexusServerUrl) throws NexusRestWrapperException {
LOGGER.trace("new NexusRestWrapper: nexusServerUrl=" + nexusServerUrl);
if (isNullOrBlank(nexusServerUrl)) {
throw new NexusRestWrapperException("nexusServerUrl must be specified for the Nexus server");
}
this.nexusServerUrl = nexusServerUrl;
// Create a client for RST calls towards the Nexus server
client = ClientBuilder.newClient();
}
/**
* Instantiates a new Nexus REST agent with credentials.
*
* @param nexusServerUrl the URL of the Nexus server as a string
* @param nexusUser the Nexus userid
* @param nexusPassword the Nexus password
* @throws NexusRestWrapperException on parameter exceptions
*/
public NexusRestWrapper(final String nexusServerUrl, final String nexusUser, final String nexusPassword)
throws NexusRestWrapperException {
LOGGER.trace("new NexusRestWrapper: nexusServerUrl=" + nexusServerUrl);
if (isNullOrBlank(nexusServerUrl)) {
throw new NexusRestWrapperException("nexusServerUrl must be specified for the Nexus server");
}
if (isNullOrBlank(nexusUser) || isNullOrBlank(nexusPassword)) {
throw new NexusRestWrapperException("nexuusUser and nexusPassword must both be specified");
}
this.nexusServerUrl = nexusServerUrl;
this.nexusUser = nexusUser;
this.nexusPassword = nexusPassword;
// Create a client for RST calls towards the Nexus server
client = ClientBuilder.newClient();
LOGGER.trace("NexusRestWrapper created: nexusServerUrl=" + nexusServerUrl);
}
/**
* Close the REST client.
*/
public void close() {
LOGGER.trace("NexusRestWrapper closing: url=" + nexusServerUrl);
// Close the web client
client.close();
LOGGER.trace("NexusRestWrapper closed: url=" + nexusServerUrl);
}
/**
* Find an artifact in the Nexus server.
*
* @param searchParameters
* the search parameters to use for the search
* @return the list of artifacts found that match the requested artifact
* @throws NexusRestWrapperException
* Exceptions accessing the Nexus server
*/
public NexusSearchResult findArtifact(final NexusRestSearchParameters searchParameters)
throws NexusRestWrapperException {
LOGGER.trace("new search with search parameters: " + searchParameters);
// Issue the REST request to perform the search
URI searchUri = searchParameters.getSearchUri(nexusServerUrl);
LOGGER.debug("search URI is: " + searchUri.toString());
// Compose the REST request
Builder requestBuilder = client.target(searchUri).request("application/json");
getAuthorizationHeader(requestBuilder);
// Issue the REST request
Response response = requestBuilder.get();
LOGGER.debug("search response is: " + response.toString());
// Check the HTTP response code for the search
if (Response.Status.OK.getStatusCode() != response.getStatus()) {
LOGGER.warn("search to URI " + searchUri.toString() + "failed, response was: " + response.toString());
throw new NexusRestWrapperException("query to Nexus failed with message: " + response.toString());
}
try {
// Get the JSON string with the the search result
String responseString = response.readEntity(String.class);
// Parse the returned JSON into result POJOs
NexusSearchResult searchResult = new Gson().fromJson(responseString, NexusSearchResult.class);
// We now need to expand the release and snapshot URL paths for each artifact
expandArtifactUrlPaths(searchResult);
return searchResult;
} catch (Exception e) {
LOGGER.warn("processing of result from search to URI " + searchUri
+ " failed with message " + e.getMessage());
throw new NexusRestWrapperException(
"processing of result from query to Nexus failed with message: " + e.getMessage(), e);
}
}
/**
* Get the authorisation header for the user name and password.
* @param requestBuilder the request builder to add authorization to
* @return the authorisation header
*/
private Builder getAuthorizationHeader(Builder requestBuilder) {
if (null != nexusUser && null != nexusPassword) {
String userPassString = nexusUser + ":" + nexusPassword;
requestBuilder.header("Authorization", "Basic "
+ java.util.Base64.getEncoder().encodeToString(userPassString.getBytes()));
}
return requestBuilder;
}
/**
* Use the Repository URLs in the search result to create a release and snapshot URL path for each artifact.
* @param searchResult the results of a Nexus server search
*/
private void expandArtifactUrlPaths(NexusSearchResult searchResult) {
// Create a map of repositories for doing lookups
Map<String, NexusRepository> repositoryMap = new HashMap<>();
for (NexusRepository repository : searchResult.getRepoDetailsList()) {
repositoryMap.put(repository.getRepositoryId(), repository);
}
for (NexusArtifact artifact : searchResult.getArtifactList()) {
artifact.setUrlPath(composeArtifactUrlPath(repositoryMap, artifact));
}
}
/**
* Compose an artifact URL path using the repository and artifact details for the artifact.
* @param repositoryMap the available repositories
* @param artifact the artifact
* @return the URL path
*/
private String composeArtifactUrlPath(Map<String, NexusRepository> repositoryMap, NexusArtifact artifact) {
// We always have one hit
NexusRepository repository = repositoryMap.get(artifact.getArtifactHits().get(0).getRepositoryId());
return new StringBuilder()
.append(repository.getRepositoryUrl())
.append("/content/")
.append(artifact.getGroupId().replace('.', '/'))
.append('/')
.append(artifact.getArtifactId())
.append('/')
.append(artifact.getVersion())
.append('/')
.append(artifact.getArtifactId())
.append('-')
.append(artifact.getVersion())
.toString();
}
/**
* Check if a string is null or all white space.
*/
private boolean isNullOrBlank(final String parameter) {
return null == parameter || parameter.trim().isEmpty();
}
}
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