com.facebook.buck.httpserver.StaticResourcesHandler.java Source code

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Here is the source code for com.facebook.buck.httpserver.StaticResourcesHandler.java

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/*
 * Copyright 2013-present Facebook, Inc.
 *
 * 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 com.facebook.buck.httpserver;

import com.facebook.buck.core.util.log.Logger;
import com.google.common.base.Charsets;
import com.google.common.io.ByteStreams;
import com.google.common.net.MediaType;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;

/**
 * Handler to serve static resources out of the resources/static directory.
 *
 * <p>TODO(mbolin): This implementation is lame: it does not cache anything in memory, it does not
 * send the appropriate headers to do proper HTTP caching, it doesn't stream responses, etc. We can
 * revisit performance issues once people use this feature enough to make it worth optimizing.
 */
class StaticResourcesHandler extends AbstractHandler {
    private static final Logger LOG = Logger.get(StaticResourcesHandler.class);

    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        if (!"GET".equals(request.getMethod())) {
            Responses.writeFailedResponse(baseRequest, response);
            return;
        }

        String path = baseRequest.getHttpURI().getPath();
        if ("/static/test_websocket.html".equals(path)) {
            String html = getContentsForResource(path);
            Responses.writeSuccessfulResponse(html, MediaType.HTML_UTF_8, baseRequest, response);
        } else if ("/static/test_websocket.js".equals(path)) {
            String js = getContentsForResource(path);
            Responses.writeSuccessfulResponse(js, MediaType.JAVASCRIPT_UTF_8, baseRequest, response);
        } else if ("/static/theme.css".equals(path)) {
            String css = getContentsForResource(path);
            Responses.writeSuccessfulResponse(css, MediaType.CSS_UTF_8, baseRequest, response);
        } else if ("/static/trace_viewer.css".equals(path)) {
            String css = getContentsForResource(path);
            Responses.writeSuccessfulResponse(css, MediaType.CSS_UTF_8, baseRequest, response);
        } else if ("/static/trace_viewer.js".equals(path)) {
            String js = getContentsForResource(path);
            Responses.writeSuccessfulResponse(js, MediaType.JAVASCRIPT_UTF_8, baseRequest, response);
        } else {
            LOG.error("No handler for %s", path);
            Responses.writeFailedResponse(baseRequest, response);
        }
    }

    /**
     * Note that this is a private method and we always pass a known value for {@code path} into this
     * method so that it is not possible to read an arbitrary resource via this method.
     *
     * @param path is a relative path under the resources folder for this package.
     */
    private String getContentsForResource(String path) throws IOException {
        InputStream input = getClass().getResourceAsStream(String.format("resources%s", path));
        byte[] bytes = ByteStreams.toByteArray(input);
        return new String(bytes, Charsets.UTF_8);
    }
}