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/*
 * 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 com.arakelian.elastic;

import java.io.IOException;

import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okio.BufferedSink;
import okio.GzipSink;
import okio.Okio;

public class GzipRequestInterceptor implements Interceptor {
    private RequestBody gzip(final RequestBody body) {
        return new RequestBody() {
            @Override
            public long contentLength() {
                return -1; // We don't know the compressed length in advance!
            }

            @Override
            public MediaType contentType() {
                return body.contentType();
            }

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

    @Override
    public Response intercept(final Chain chain) throws IOException {
        final Request originalRequest = chain.request();
        if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
            return chain.proceed(originalRequest);
        }

        final Request compressedRequest = originalRequest.newBuilder() //
                .header("Content-Encoding", "gzip") //
                .method(originalRequest.method(), gzip(originalRequest.body())) //
                .build();
        return chain.proceed(compressedRequest);
    }
}