View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.search.api.transport;
20  
21  import java.io.IOException;
22  import java.io.InputStream;
23  import java.net.URI;
24  import java.net.http.HttpClient;
25  import java.net.http.HttpRequest;
26  import java.net.http.HttpResponse;
27  import java.time.Duration;
28  import java.util.AbstractMap;
29  import java.util.Map;
30  import java.util.stream.Collectors;
31  
32  import static java.util.Objects.requireNonNull;
33  
34  /**
35   * Java 11 {@link HttpClient} backed transport.
36   */
37  public class Java11HttpClientTransport implements Transport {
38      protected static class ResponseImpl implements Response {
39  
40          protected final HttpResponse<?> response;
41  
42          protected final InputStream inputStream;
43  
44          protected ResponseImpl(HttpResponse<?> response, InputStream inputStream) {
45              this.response = requireNonNull(response);
46              this.inputStream = inputStream;
47          }
48  
49          @Override
50          public int getCode() {
51              return response.statusCode();
52          }
53  
54          @Override
55          public Map<String, String> getHeaders() {
56              return response.headers().map().entrySet().stream()
57                      .map(e -> new AbstractMap.SimpleEntry<>(
58                              e.getKey(), e.getValue().get(0)))
59                      .collect(Collectors.toMap(AbstractMap.SimpleEntry::getKey, AbstractMap.SimpleEntry::getValue));
60          }
61  
62          @Override
63          public InputStream getBody() {
64              return inputStream;
65          }
66  
67          @Override
68          public void close() throws IOException {
69              if (inputStream != null) {
70                  inputStream.close();
71              }
72          }
73  
74          @Override
75          public String toString() {
76              return response.uri() + " -> " + response.version() + " " + response.statusCode();
77          }
78      }
79  
80      protected final Duration timeout;
81  
82      protected final HttpClient client;
83  
84      public Java11HttpClientTransport() {
85          this(Duration.ofSeconds(10L));
86      }
87  
88      public Java11HttpClientTransport(Duration timeout) {
89          this(
90                  timeout,
91                  HttpClient.newBuilder()
92                          .connectTimeout(timeout)
93                          .followRedirects(HttpClient.Redirect.NEVER)
94                          .build());
95      }
96  
97      public Java11HttpClientTransport(Duration timeout, HttpClient client) {
98          this.timeout = requireNonNull(timeout);
99          this.client = requireNonNull(client);
100     }
101 
102     @Override
103     public Response get(String serviceUri, Map<String, String> headers) throws IOException {
104         HttpRequest.Builder builder = HttpRequest.newBuilder()
105                 .timeout(timeout)
106                 .uri(URI.create(serviceUri))
107                 .GET();
108         for (Map.Entry<String, String> header : headers.entrySet()) {
109             builder.header(header.getKey(), header.getValue());
110         }
111         HttpRequest request = builder.build();
112         try {
113             HttpResponse<InputStream> response = client.send(request, HttpResponse.BodyHandlers.ofInputStream());
114             return new ResponseImpl(response, response.body());
115         } catch (InterruptedException e) {
116             Thread.currentThread().interrupt();
117             throw new IOException(e);
118         }
119     }
120 
121     @Override
122     public Response head(String serviceUri, Map<String, String> headers) throws IOException {
123         HttpRequest.Builder builder = HttpRequest.newBuilder()
124                 .timeout(timeout)
125                 .uri(URI.create(serviceUri))
126                 .method("HEAD", HttpRequest.BodyPublishers.noBody());
127         for (Map.Entry<String, String> header : headers.entrySet()) {
128             builder.header(header.getKey(), header.getValue());
129         }
130         HttpRequest request = builder.build();
131         try {
132             HttpResponse<Void> response = client.send(request, HttpResponse.BodyHandlers.discarding());
133             return new ResponseImpl(response, null);
134         } catch (InterruptedException e) {
135             Thread.currentThread().interrupt();
136             throw new IOException(e);
137         }
138     }
139 }