content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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.
   */
  package org.apache.camel.component.jira.oauth;
  
  import java.io.File;
  import java.io.InputStream;
  import java.net.URI;
  import java.nio.file.Path;
  import java.util.Date;
  import java.util.Optional;
  import java.util.Properties;
  
  import com.atlassian.event.api.EventPublisher;
  import com.atlassian.httpclient.apache.httpcomponents.DefaultHttpClientFactory;
  import com.atlassian.httpclient.api.HttpClient;
  import com.atlassian.httpclient.api.factory.HttpClientOptions;
  import com.atlassian.jira.rest.client.api.AuthenticationHandler;
  import com.atlassian.jira.rest.client.internal.async.DisposableHttpClient;
  import com.atlassian.sal.api.ApplicationProperties;
  import com.atlassian.sal.api.UrlMode;
  import com.atlassian.sal.api.executor.ThreadLocalContextManager;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Similar to AsynchronousHttpClientFactory, except we use a custom OAuthHttpClientDecorator
   */
  public class OAuthAsynchronousHttpClientFactory {
  
      private static final String JIRA_REST_CLIENT_VERSION
              = MavenUtils.getVersion("com.atlassian.jira", "jira-rest-java-client-api");
  
      @SuppressWarnings("unchecked")
      public DisposableHttpClient createClient(final URI serverUri, final AuthenticationHandler authenticationHandler) {
          final HttpClientOptions options = new HttpClientOptions();
  
          final DefaultHttpClientFactory<?> defaultHttpClientFactory = new DefaultHttpClientFactory<>(
                  new NoOpEventPublisher(),
                  new RestClientApplicationProperties(serverUri),
                  new ThreadLocalContextManager<>() {
                      @Override
                      public Object getThreadLocalContext() {
                          return null;
                      }
  
                      @Override
                      public void setThreadLocalContext(Object context) {
                      }
  
                      @Override
                      public void clearThreadLocalContext() {
                      }
                  });
  
          final HttpClient httpClient = defaultHttpClientFactory.create(options);
  
          return new OAuthHttpClientDecorator(httpClient, authenticationHandler) {
              @Override
              public void destroy() throws Exception {
                  defaultHttpClientFactory.dispose(httpClient);
              }
          };
      }
  
      private static class NoOpEventPublisher implements EventPublisher {
          @Override
          public void publish(Object o) {
          }
  
          @Override
          public void register(Object o) {
          }
  
          @Override
          public void unregister(Object o) {
          }
  
          @Override
          public void unregisterAll() {
          }
      }
  
      /**
       * These properties are used to present JRJC as a User-Agent during http requests.
       */
      private static final class RestClientApplicationProperties implements ApplicationProperties {
  
          private final String baseUrl;
  
          private RestClientApplicationProperties(URI jiraURI) {
              this.baseUrl = jiraURI.getPath();
          }
  
          @Override
          public String getBaseUrl() {
              return baseUrl;
          }
  
          /**
           * We'll always have an absolute URL as a client.
           */
          @Override
          public String getBaseUrl(UrlMode urlMode) {
              return baseUrl;
          }
  
          @Override
          public String getDisplayName() {
              return "Atlassian JIRA Rest Java Client";
          }
  
          @Override
          public String getPlatformId() {
              return ApplicationProperties.PLATFORM_JIRA;
          }
  
          @Override
          public String getVersion() {
              return JIRA_REST_CLIENT_VERSION;
          }
  
          @Override
          public Date getBuildDate() {
              // TODO implement using MavenUtils, JRJC-123
              throw new UnsupportedOperationException();
          }
  
          @Override
          public String getBuildNumber() {
              // TODO implement using MavenUtils, JRJC-123
              return String.valueOf(0);
          }
  
          @Override
          public File getHomeDirectory() {
              return new File(".");
          }
  
          @Override
          public Optional<Path> getLocalHomeDirectory() {
              return Optional.empty();
          }
  
          @Override
          public Optional<Path> getSharedHomeDirectory() {
              return Optional.empty();
          }
  
          @Override
          public String getPropertyValue(final String s) {
              throw new UnsupportedOperationException("Not implemented");
          }
  
          @Override
          public String getApplicationFileEncoding() {
              return "UTF-8";
          }
      }
  
      private static final class MavenUtils {
          private static final Logger LOG = LoggerFactory.getLogger(MavenUtils.class);
          private static final String UNKNOWN_VERSION = "unknown";
  
          static String getVersion(String groupId, String artifactId) {
              final Properties props = new Properties();
              String pomProps = String.format("/META-INF/maven/%s/%s/pom.properties", groupId, artifactId);
              try (InputStream resourceAsStream = org.apache.camel.util.ObjectHelper.loadResourceAsStream(pomProps,
                      OAuthAsynchronousHttpClientFactory.class.getClassLoader())) {
                  props.load(resourceAsStream);
                  return props.getProperty("version", UNKNOWN_VERSION);
              } catch (Exception e) {
                  LOG.debug("Could not find version for Jira Rest Java Client maven artifact {}:{}. Error: {}", groupId,
                          artifactId, e.getMessage());
                  return UNKNOWN_VERSION;
              }
          }
      }
  
  }
  