org.openqa.selenium.remote.server.Passthrough.java Source code

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Here is the source code for org.openqa.selenium.remote.server.Passthrough.java

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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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 org.openqa.selenium.remote.server;

import static com.google.common.net.MediaType.JSON_UTF_8;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.openqa.selenium.remote.http.HttpMethod.POST;

import com.google.common.collect.ImmutableSet;
import com.google.common.io.CharStreams;
import com.google.common.net.MediaType;

import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Objects;
import java.util.logging.Logger;

class Passthrough implements SessionCodec {

    private final static Logger LOG = Logger.getLogger(Passthrough.class.getName());

    private final static ImmutableSet<String> IGNORED_REQ_HEADERS = ImmutableSet.<String>builder().add("connection")
            .add("keep-alive").add("proxy-authorization").add("proxy-authenticate").add("proxy-connection")
            .add("te").add("trailer").add("transfer-encoding").add("upgrade").build();

    private final URL upstream;

    public Passthrough(URL upstream) {
        this.upstream = upstream;
    }

    @Override
    public void handle(HttpRequest req, HttpResponse resp) throws IOException {
        URL target = new URL(upstream.toExternalForm() + req.getUri());
        HttpURLConnection connection = (HttpURLConnection) target.openConnection();
        connection.setInstanceFollowRedirects(true);
        connection.setRequestMethod(req.getMethod().toString());
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);

        for (String name : req.getHeaderNames()) {
            if (IGNORED_REQ_HEADERS.contains(name.toLowerCase())) {
                continue;
            }

            for (String value : req.getHeaders(name)) {
                connection.addRequestProperty(name, value);
            }
        }
        // None of this "keep alive" nonsense.
        connection.setRequestProperty("Connection", "close");

        if (POST == req.getMethod()) {
            // We always transform to UTF-8 on the way up.
            String contentType = req.getHeader("Content-Type");
            contentType = contentType == null ? JSON_UTF_8.toString() : contentType;

            MediaType type = MediaType.parse(contentType);
            connection.setRequestProperty("Content-Type", type.withCharset(UTF_8).toString());

            Charset charSet = req.getContentEncoding();

            StringWriter logWriter = new StringWriter();
            try (InputStream is = req.consumeContentStream();
                    Reader reader = new InputStreamReader(is, charSet);
                    Reader in = new TeeReader(reader, logWriter);
                    OutputStream os = connection.getOutputStream();
                    Writer out = new OutputStreamWriter(os, UTF_8)) {
                CharStreams.copy(in, out);
            }
            LOG.info("To upstream: " + logWriter.toString());
        }

        resp.setStatus(connection.getResponseCode());
        // clear response defaults.
        resp.setHeader("Date", null);
        resp.setHeader("Server", null);

        connection.getHeaderFields().entrySet().stream()
                .filter(entry -> entry.getKey() != null && entry.getValue() != null)
                .filter(entry -> !IGNORED_REQ_HEADERS.contains(entry.getKey().toLowerCase())).forEach(entry -> {
                    entry.getValue().stream().filter(Objects::nonNull)
                            .forEach(value -> resp.addHeader(entry.getKey(), value));
                });
        InputStream in = connection.getErrorStream();
        if (in == null) {
            in = connection.getInputStream();
        }

        String charSet = connection.getContentEncoding() != null ? connection.getContentEncoding() : UTF_8.name();
        try (Reader reader = new InputStreamReader(in, charSet)) {
            String content = CharStreams.toString(reader);
            LOG.info("To downstream: " + content);
            resp.setContent(content.getBytes(charSet));
        } finally {
            in.close();
        }
    }
}