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/*
 * Segment Public API
 * The Segment Public API helps you manage your Segment Workspaces and its resources. You can use the API to perform CRUD (create, read, update, delete) operations at no extra charge. This includes working with resources such as Sources, Destinations, Warehouses, Tracking Plans, and the Segment Destinations and Sources Catalogs.  All CRUD endpoints in the API follow REST conventions and use standard HTTP methods. Different URL endpoints represent different resources in a Workspace.  See the next sections for more information on how to use the Segment Public API. 
 *
 * The version of the OpenAPI document: 32.0.3
 * Contact: [email protected]
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */


package com.segment.publicapi;

import okhttp3.*;
import okio.Buffer;
import okio.BufferedSink;
import okio.GzipSink;
import okio.Okio;

import java.io.IOException;

/**
 * Encodes request bodies using gzip.
 *
 * Taken from https://github.com/square/okhttp/issues/350
 */
class GzipRequestInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
            return chain.proceed(originalRequest);
        }

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

    private RequestBody forceContentLength(final RequestBody requestBody) throws IOException {
        final Buffer buffer = new Buffer();
        requestBody.writeTo(buffer);
        return new RequestBody() {
            @Override
            public MediaType contentType() {
                return requestBody.contentType();
            }

            @Override
            public long contentLength() {
                return buffer.size();
            }

            @Override
            public void writeTo(BufferedSink sink) throws IOException {
                sink.write(buffer.snapshot());
            }
        };
    }

    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();
            }
        };
    }
}