code: /**
   * This file is part of Eclipse Steady.
   *
   * 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.
   *
   * SPDX-License-Identifier: Apache-2.0
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.backend.util;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.nio.charset.Charset;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Base64;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.persistence.EntityNotFoundException;
  
  import org.eclipse.steady.backend.rest.CoverageController;
  import org.eclipse.steady.backend.rest.CoverageController.JiraSearchResponse;
  import org.eclipse.steady.shared.connectivity.PathBuilder;
  import org.eclipse.steady.shared.connectivity.Service;
  import org.eclipse.steady.shared.connectivity.ServiceConnectionException;
  import org.eclipse.steady.shared.enums.ConstructType;
  import org.eclipse.steady.shared.enums.ProgrammingLanguage;
  import org.eclipse.steady.shared.json.model.Artifact;
  import org.eclipse.steady.shared.json.model.ConstructId;
  import org.eclipse.steady.shared.json.model.LibraryId;
  import org.eclipse.steady.shared.json.model.diff.JarDiffResult;
  import org.eclipse.steady.shared.json.model.mavenCentral.ResponseDoc;
  import org.eclipse.steady.shared.util.VulasConfiguration;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.http.HttpEntity;
  import org.springframework.http.HttpHeaders;
  import org.springframework.http.HttpMethod;
  import org.springframework.http.ResponseEntity;
  import org.springframework.web.client.HttpClientErrorException;
  import org.springframework.web.client.RestClientException;
  import org.springframework.web.client.RestTemplate;
  
  /**
   * Makes RESTful services available to local clients.
   * Depends on
   */
  public class ServiceWrapper {
  
    private static Logger log = LoggerFactory.getLogger(ServiceWrapper.class);
  
    private static ServiceWrapper instance = null;
  
    private ServiceWrapper() {}
  
    /**
     * <p>Getter for the field <code>instance</code>.</p>
     *
     * @return a {@link org.eclipse.steady.backend.util.ServiceWrapper} object.
     */
    public static synchronized ServiceWrapper getInstance() {
      if (instance == null) instance = new ServiceWrapper();
      return instance;
    }
  
    /**
     * Returns all versions of the Maven artifact with the given group and
     * artifact identifiers and packaging "JAR".
     *
     * @param _group a {@link java.lang.String} object.
     * @param _artifact a {@link java.lang.String} object.
     * @param _latest if true, only the latest version will be returned
     * @param _gt if specified, only versions greater than the provided value are
     * returned
     * @throws org.eclipse.steady.shared.connectivity.ServiceConnectionException
     * if any.
     * @return a {@link java.util.Collection} object.
     */
    public Collection<LibraryId> getAllArtifactVersions(
        String _group, String _artifact, boolean _latest, String _gt)
        throws ServiceConnectionException {
      // Build URL
      final String service_url = VulasConfiguration.getGlobal().getServiceUrl(Service.CIA, true);
      final String service_path;
      String param_template;
      if (_latest) {
        service_path = PathBuilder.artifactsLatestGroupVersion(_group, _artifact);
        param_template = "?packagingFilter={p}";
      } else if (_gt != null) {
        service_path = PathBuilder.artifactsGreaterGroupVersion(_group, _artifact, _gt);
        param_template = "?packagingFilter={p}";
      } else {
        service_path = PathBuilder.artifactsGroupVersion(_group, _artifact);
        param_template = "?packaging={p}";
      }
  
      final String url = service_url.concat(service_path);
  
      // Parameters
      final Map<String, String> params = new HashMap<String, String>();
      params.put("p", "jar");
  
      // Make the query
      final List<LibraryId> result = new ArrayList<LibraryId>();
      URI uri = null;
      try {
        uri = new URI(url);
        this.logCallInfo(uri, params);
        final RestTemplate rest_template = new RestTemplate();
        //	LibraryId[] all_libids_array;
        if (_latest) {
          Artifact l = rest_template.getForObject(url + param_template, Artifact.class, params);
          // all_libids_array = new LibraryId[]{l.getLibId()};
          result.add(l.getLibId());
        } else {
          Artifact[] artifacts =
              rest_template.getForObject(url + param_template, Artifact[].class, params);
          for (Artifact a : artifacts) result.add(a.getLibId());
        }
        // result.addAll(Arrays.asList(all_libids_array));
      } catch (RestClientException e) {
        if (e.getMessage().contains("404")) log.info("Call [" + uri + "] returned 404 Not Found");
        else if (e.getMessage().contains("400"))
          log.error("Call [" + uri + "] returned 400 Bad request");
        else throw new ServiceConnectionException(uri, e);
      } catch (URISyntaxException use) {
        throw new ServiceConnectionException("Cannot create service URI from [" + url + "]", use);
      }
  
      return result;
    }
  
    /**
     * <p>getArtifactConstructs.</p>
     *
     * @param _group a {@link java.lang.String} object.
     * @param _artifact a {@link java.lang.String} object.
     * @param _version a {@link java.lang.String} object.
     * @param _t a {@link org.eclipse.steady.shared.enums.ConstructType} object.
     * @return a {@link java.util.List} object.
     * @throws org.eclipse.steady.shared.connectivity.ServiceConnectionException if any.
     */
    public List<ConstructId> getArtifactConstructs(
        String _group, String _artifact, String _version, ConstructType _t)
        throws ServiceConnectionException {
      // Build URL
      final String service_url = VulasConfiguration.getGlobal().getServiceUrl(Service.CIA, true);
      final String service_path = PathBuilder.artifactsConstruct(_group, _artifact, _version);
      final String url = service_url.concat(service_path);
      String param_template = (_t != null) ? "?type={type}" : "";
  
      // Parameters
      final Map<String, String> params = new HashMap<String, String>();
      if (_t != null) params.put("type", _t.toString());
      // Make the query
      final List<ConstructId> result = new ArrayList<ConstructId>();
      URI uri = null;
      try {
        uri = new URI(url);
        this.logCallInfo(uri, params);
        final RestTemplate rest_template = new RestTemplate();
        ConstructId[] all_libids_array =
            rest_template.getForObject(url + param_template, ConstructId[].class, params);
        result.addAll(Arrays.asList(all_libids_array));
      } catch (RestClientException e) {
        throw new ServiceConnectionException(uri, e);
      } catch (URISyntaxException use) {
        throw new ServiceConnectionException("Cannot create service URI from [" + url + "]", use);
      }
  
      return result;
    }
  
    /**
     * <p>diffJars.</p>
     *
     * @param _old a {@link org.eclipse.steady.shared.json.model.LibraryId} object.
     * @param _new a {@link org.eclipse.steady.shared.json.model.LibraryId} object.
     * @return a {@link org.eclipse.steady.shared.json.model.diff.JarDiffResult} object.
     * @throws org.eclipse.steady.shared.connectivity.ServiceConnectionException if any.
     */
    public JarDiffResult diffJars(LibraryId _old, LibraryId _new) throws ServiceConnectionException {
      final String service_url = VulasConfiguration.getGlobal().getServiceUrl(Service.CIA, true);
      final String service_path = PathBuilder.diffArtifacts();
      final String url = service_url.concat(service_path);
  
      // The artifacts to compare
      final Artifact[] artifacts = new Artifact[2];
      artifacts[0] = ServiceWrapper.fromLibid(_old);
      artifacts[0].setPackaging("jar");
      artifacts[0].setProgrammingLanguage(ProgrammingLanguage.JAVA);
      artifacts[1] = ServiceWrapper.fromLibid(_new);
      artifacts[1].setPackaging("jar");
      artifacts[1].setProgrammingLanguage(ProgrammingLanguage.JAVA);
  
      // Make the query
      JarDiffResult result;
      URI uri = null;
      try {
        uri = new URI(url);
        this.logCallInfo(uri, null);
        final RestTemplate rest_template = new RestTemplate();
        result = rest_template.postForObject(url, artifacts, JarDiffResult.class, (Object) null);
      } catch (HttpClientErrorException he) {
        throw new EntityNotFoundException();
      } catch (RestClientException e) {
        throw new ServiceConnectionException(uri, e);
      } catch (URISyntaxException use) {
        throw new ServiceConnectionException("Cannot create service URI from [" + url + "]", use);
      }
  
      return result;
    }
  
    /**
     * Returns a {@link ResponseDoc} corresponding to the given {@link LibraryId}.
     * @param _libid
     * @return
     */
    private static Artifact fromLibid(LibraryId _libid) {
      final Artifact d = new Artifact();
      d.setLibId(_libid);
      return d;
    }
  
    /**
     * Logs call information.
     * @param _uri
     * @param _params
     */
    private void logCallInfo(URI _uri, Map<String, String> _params) {
      final StringBuilder b = new StringBuilder();
      b.append("Calling [").append(_uri.toString()).append("]");
      if (_params != null && _params.size() > 0) {
        b.append(" with params [");
        int i = 0;
        for (Map.Entry<String, String> e : _params.entrySet()) {
          if (i++ > 0) b.append(", ");
          b.append(e.getKey()).append("=").append(e.getValue());
        }
      }
      log.info(b.toString() + "]");
    }
  
    /**
     * <p>searchJira.</p>
     *
     * @param _bugid a {@link java.lang.String} object.
     * @return a {@link org.eclipse.steady.backend.rest.CoverageController.JiraSearchResponse} object.
     * @throws org.eclipse.steady.shared.connectivity.ServiceConnectionException if any.
     */
    public JiraSearchResponse searchJira(String _bugid) throws ServiceConnectionException {
      JiraSearchResponse response = null;
  
      final String service_url = VulasConfiguration.getGlobal().getServiceUrl(Service.JIRA, true);
      final String project_id =
          VulasConfiguration.getGlobal()
              .getConfiguration()
              .getString(CoverageController.PROJECT_ID, null);
      final String component_id =
          VulasConfiguration.getGlobal()
              .getConfiguration()
              .getString(CoverageController.COMPONENT_ID, null);
  
      if (service_url == null
          || service_url.equals("")
          || project_id == null
          || project_id.equals("")
          || component_id == null
          || component_id.equals("")) {
        log.error(
            "Jira configuration settings ["
                + VulasConfiguration.getGlobal().getServiceUrlKey(Service.JIRA)
                + ", "
                + CoverageController.PROJECT_ID
                + ", "
                + CoverageController.COMPONENT_ID
                + "] not fully specified");
      } else {
        // Parameters
        final String param_template = "?jql={jql}";
        final Map<String, String> params = new HashMap<String, String>();
        params.put(
            "jql",
            "project = "
                + project_id
                + " AND component = "
                + component_id
                + " AND summary ~ \""
                + _bugid
                + "\"");
  
        // Make the query
        URI uri = null;
        try {
          uri = new URI(service_url);
          this.logCallInfo(uri, params);
          final RestTemplate rest_template = new RestTemplate();
          if ((VulasConfiguration.getGlobal()
                      .getConfiguration()
                      .getString(VulasConfiguration.VULAS_JIRA_USER)
                  == null)
              || (VulasConfiguration.getGlobal()
                      .getConfiguration()
                      .getString(VulasConfiguration.VULAS_JIRA_PWD)
                  == null)) {
            log.error(
                "Missing Jira credentials, please provide the arguments -Dvulas.jira.usr and"
                    + " -Dvulas.jira.pwd at startup");
  
            throw new ServiceConnectionException(
                "Missing Jira credentials, please provide the arguments -Dvulas.jira.usr and"
                    + " -Dvulas.jira.pwd at startup",
                new Throwable(
                    "Missing Jira credentials, please provide the arguments -Dvulas.jira.usr and"
                        + " -Dvulas.jira.pwd at startup"));
          }
  
          final ResponseEntity<JiraSearchResponse> re =
              rest_template.exchange(
                  service_url + param_template,
                  HttpMethod.GET,
                  new HttpEntity<String>(
                      this.createHeaders(
                          VulasConfiguration.getGlobal()
                              .getConfiguration()
                              .getString(VulasConfiguration.VULAS_JIRA_USER),
                          VulasConfiguration.getGlobal()
                              .getConfiguration()
                              .getString(VulasConfiguration.VULAS_JIRA_PWD))),
                  JiraSearchResponse.class,
                  params);
  
          response = re.getBody();
        } catch (RestClientException e) {
          throw new ServiceConnectionException(uri, e);
        } catch (URISyntaxException use) {
          throw new ServiceConnectionException(
              "Cannot create service URI from [" + service_url + "]", use);
        }
      }
  
      return response;
    }
  
    private HttpHeaders createHeaders(final String username, final String password) {
      return new HttpHeaders() {
        {
          String auth = username + ":" + password;
          byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(Charset.forName("US-ASCII")));
          String authHeader = "Basic " + new String(encodedAuth);
          set("Authorization", authHeader);
        }
      };
    }
  }
  