org.graylog.plugins.usagestatistics.okhttp.GzipRequestInterceptor Maven / Gradle / Ivy

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Plugin for collecting anonymous usage statistics of Graylog clusters and nodes

There is a newer version: 2.2.0-alpha.1

/**
 * Copyright (C) 2015 Graylog, Inc. ([email protected])
 *
 * 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.
 */
package org.graylog.plugins.usagestatistics.okhttp;

import com.google.common.net.HttpHeaders;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okio.BufferedSink;
import okio.GzipSink;
import okio.Okio;

import java.io.IOException;

/**
 * This {@link okhttp3.Interceptor} compresses the HTTP request body with gzip.
 * 
 * Many web servers can't handle this but we know that the statistics collector is able to do this.
 * 
 *
 * @see OkHttp Wiki
 */
public final class GzipRequestInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        if (originalRequest.body() == null || originalRequest.header(HttpHeaders.CONTENT_ENCODING) != null) {
            return chain.proceed(originalRequest);
        }

        Request compressedRequest = originalRequest.newBuilder()
                .header(HttpHeaders.CONTENT_ENCODING, "gzip")
                .method(originalRequest.method(), gzip(originalRequest.body()))
                .build();
        return chain.proceed(compressedRequest);
    }

    private RequestBody gzip(final RequestBody body) {
        return new RequestBody() {
            @Override
            public MediaType contentType() {
                return body.contentType();
            }

            @Override
            public long contentLength() {
                return -1; // We don't know the compressed length in advance!
            }

            @Override
            public void writeTo(BufferedSink sink) throws IOException {
                BufferedSink gzipSink = Okio.buffer(new GzipSink(sink));
                body.writeTo(gzipSink);
                gzipSink.close();
            }
        };
    }
}