core/src/test/java/fi/iki/elonen/integration/GZipIntegrationTest.java

package fi.iki.elonen.integration;

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import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DecompressingHttpClient;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

import fi.iki.elonen.NanoHTTPD;

public class GZipIntegrationTest extends IntegrationTestBase<GZipIntegrationTest.TestServer> {

    public static class TestServer extends NanoHTTPD {

        public Response response;

        public TestServer() {
            super(8192);
        }

        @Override
        public Response serve(IHTTPSession session) {
            return response;
        }

        @Override
        protected boolean useGzipWhenAccepted(Response r) {
            return true;
        }
    }

    @Override
    public TestServer createTestServer() {
        return new TestServer();
    }

    @Test
    public void contentEncodingShouldBeAddedToFixedLengthResponses() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = httpclient.execute(request);
        Header contentEncoding = response.getFirstHeader("content-encoding");
        assertNotNull("Content-Encoding should be set", contentEncoding);
        assertEquals("gzip", contentEncoding.getValue());
    }

    @Test
    public void contentEncodingShouldBeAddedToChunkedResponses() throws IOException {
        InputStream data = new ByteArrayInputStream("This is a test".getBytes("UTF-8"));
        testServer.response = NanoHTTPD.newChunkedResponse(NanoHTTPD.Response.Status.OK, "text/plain", data);
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = httpclient.execute(request);
        Header contentEncoding = response.getFirstHeader("content-encoding");
        assertNotNull("Content-Encoding should be set", contentEncoding);
        assertEquals("gzip", contentEncoding.getValue());
    }

    @Test
    public void shouldFindCorrectAcceptEncodingAmongMany() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "deflate,gzip");
        HttpResponse response = httpclient.execute(request);
        Header contentEncoding = response.getFirstHeader("content-encoding");
        assertNotNull("Content-Encoding should be set", contentEncoding);
        assertEquals("gzip", contentEncoding.getValue());
    }

    @Test
    public void contentLengthShouldBeRemovedFromZippedResponses() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = httpclient.execute(request);
        Header contentLength = response.getFirstHeader("content-length");
        assertNull("Content-Length should not be set when gzipping response", contentLength);
    }

    @Test
    public void fixedLengthContentIsEncodedProperly() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = new DecompressingHttpClient(httpclient).execute(request);
        assertEquals("This is a test", EntityUtils.toString(response.getEntity()));
    }

    @Test
    public void chunkedContentIsEncodedProperly() throws IOException {
        InputStream data = new ByteArrayInputStream("This is a test".getBytes("UTF-8"));
        testServer.response = NanoHTTPD.newChunkedResponse(NanoHTTPD.Response.Status.OK, "text/plain", data);
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = new DecompressingHttpClient(httpclient).execute(request);
        assertEquals("This is a test", EntityUtils.toString(response.getEntity()));
    }

    @Test
    public void noGzipWithoutAcceptEncoding() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        HttpGet request = new HttpGet("http://localhost:8192/");
        HttpResponse response = httpclient.execute(request);
        Header contentEncoding = response.getFirstHeader("content-encoding");
        assertThat(contentEncoding, is(nullValue()));
        assertEquals("This is a test", EntityUtils.toString(response.getEntity()));
    }

    @Test
    public void contentShouldNotBeGzippedIfContentLengthIsAddedManually() throws IOException {
        testServer.response = NanoHTTPD.newFixedLengthResponse("This is a test");
        testServer.response.addHeader("Content-Length", "" + ("This is a test".getBytes("UTF-8").length));
        HttpGet request = new HttpGet("http://localhost:8192/");
        request.addHeader("Accept-encoding", "gzip");
        HttpResponse response = httpclient.execute(request);
        Header contentEncoding = response.getFirstHeader("content-encoding");
        assertNull("Content-Encoding should not be set when manually setting content-length", contentEncoding);
        assertEquals("This is a test", EntityUtils.toString(response.getEntity()));

    }

}