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Java DSL for easy testing of REST services
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/*
 * Copyright 2019 the original author or authors.
 *
 * 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 io.restassured.internal.http;

import io.restassured.internal.util.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.entity.HttpEntityWrapper;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;

/**
 * Content encoding used to handle GZIP responses.
 * @author Tom Nichols
 */
public class GZIPEncoding extends ContentEncoding {

    /**
     * Returns the {@link ContentEncoding.Type#GZIP} encoding string which is
     * added to the Accept-Encoding header by the base class.
     */
    @Override
    public String getContentEncoding() {
        return Type.GZIP.toString();
    }

    /**
     * Wraps the raw entity in a {@link GZIPDecompressingEntity}.
     */
    @Override
    public HttpEntity wrapResponseEntity(HttpEntity raw) {
        return new GZIPDecompressingEntity(raw);
    }

    /**
     * Entity used to interpret a GZIP-encoded response
     * @author Tom Nichols
     */
    protected static class GZIPDecompressingEntity extends HttpEntityWrapper {

        public GZIPDecompressingEntity(final HttpEntity entity) {
            super(entity);
        }

        /**
         * returns a {@link GZIPInputStream} which wraps the original entity's
         * content stream
         * @see HttpEntity#getContent()
         */
        @Override
        public InputStream getContent() throws IOException, IllegalStateException {
            InputStream content = wrappedEntity.getContent();
            byte[] bytes = IOUtils.toByteArray(content);
            ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
            if (bytes.length > 0) {
                return new GZIPInputStream(inputStream);
            } else {
                return inputStream;
            }
        }

        /**
         * @return -1
         */
        @Override
        public long getContentLength() {
            // length of un-gzipped content is not known
            return -1;
        }
    }
}