1/*
2 * Copyright (C) 2014 Square, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.squareup.okhttp.recipes;
17
18import com.google.gson.Gson;
19import com.squareup.okhttp.Interceptor;
20import com.squareup.okhttp.MediaType;
21import com.squareup.okhttp.OkHttpClient;
22import com.squareup.okhttp.Request;
23import com.squareup.okhttp.RequestBody;
24import com.squareup.okhttp.Response;
25import java.io.IOException;
26import java.util.LinkedHashMap;
27import java.util.Map;
28import okio.BufferedSink;
29import okio.GzipSink;
30import okio.Okio;
31
32public final class RequestBodyCompression {
33  /**
34   * The Google API KEY for OkHttp recipes. If you're using Google APIs for anything other than
35   * running these examples, please request your own client ID!
36   *   https://console.developers.google.com/project
37   */
38  public static final String GOOGLE_API_KEY = "AIzaSyAx2WZYe0My0i-uGurpvraYJxO7XNbwiGs";
39  public static final MediaType MEDIA_TYPE_JSON = MediaType.parse("application/json");
40
41  private final OkHttpClient client = new OkHttpClient();
42
43  public RequestBodyCompression() {
44    client.interceptors().add(new GzipRequestInterceptor());
45  }
46
47  public void run() throws Exception {
48    Map<String, String> requestBody = new LinkedHashMap<>();
49    requestBody.put("longUrl", "https://publicobject.com/2014/12/04/html-formatting-javadocs/");
50    RequestBody jsonRequestBody = RequestBody.create(
51        MEDIA_TYPE_JSON, new Gson().toJson(requestBody));
52    Request request = new Request.Builder()
53        .url("https://www.googleapis.com/urlshortener/v1/url?key=" + GOOGLE_API_KEY)
54        .post(jsonRequestBody)
55        .build();
56
57    Response response = client.newCall(request).execute();
58    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
59
60    System.out.println(response.body().string());
61  }
62
63  public static void main(String... args) throws Exception {
64    new RequestBodyCompression().run();
65  }
66
67  /** This interceptor compresses the HTTP request body. Many webservers can't handle this! */
68  static class GzipRequestInterceptor implements Interceptor {
69    @Override public Response intercept(Chain chain) throws IOException {
70      Request originalRequest = chain.request();
71      if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
72        return chain.proceed(originalRequest);
73      }
74
75      Request compressedRequest = originalRequest.newBuilder()
76          .header("Content-Encoding", "gzip")
77          .method(originalRequest.method(), gzip(originalRequest.body()))
78          .build();
79      return chain.proceed(compressedRequest);
80    }
81
82    private RequestBody gzip(final RequestBody body) {
83      return new RequestBody() {
84        @Override public MediaType contentType() {
85          return body.contentType();
86        }
87
88        @Override public long contentLength() {
89          return -1; // We don't know the compressed length in advance!
90        }
91
92        @Override public void writeTo(BufferedSink sink) throws IOException {
93          BufferedSink gzipSink = Okio.buffer(new GzipSink(sink));
94          body.writeTo(gzipSink);
95          gzipSink.close();
96        }
97      };
98    }
99  }
100}
101