io.jsync.sockjs.impl.HtmlFileTransport Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jsync.io Show documentation
jsync.io is a non-blocking, event-driven networking framework for Java
There is a newer version: 1.10.13
/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */

package io.jsync.sockjs.impl;

import io.jsync.Handler;
import io.jsync.buffer.Buffer;
import io.jsync.http.HttpServerRequest;
import io.jsync.http.RouteMatcher;
import io.jsync.impl.AsyncInternal;
import io.jsync.json.JsonObject;
import io.jsync.logging.Logger;
import io.jsync.logging.impl.LoggerFactory;
import io.jsync.sockjs.SockJSSocket;

import java.util.Map;

/**
 * @author Tim Fox
 */
class HtmlFileTransport extends BaseTransport {

    private static final Logger log = LoggerFactory.getLogger(HtmlFileTransport.class);

    private static final String HTML_FILE_TEMPLATE;

    static {
        String str =
                "\n" +
                        "\n" +
                        "  \n" +
                        "  \n" +
                        "Don't panic!\n" +
                        "  ";

        String str2 = str.replace("{{ callback }}", "");
        StringBuilder sb = new StringBuilder(str);
        int extra = 1024 - str2.length();
        for (int i = 0; i < extra; i++) {
            sb.append(' ');
        }
        sb.append("\r\n");
        HTML_FILE_TEMPLATE = sb.toString();
    }

    HtmlFileTransport(AsyncInternal async, RouteMatcher rm, String basePath, Map sessions, final JsonObject config,
                      final Handler sockHandler) {
        super(async, sessions, config);
        String htmlFileRE = basePath + COMMON_PATH_ELEMENT_RE + "htmlfile";

        rm.getWithRegEx(htmlFileRE, new Handler() {
            public void handle(final HttpServerRequest req) {
                if (log.isTraceEnabled()) log.trace("HtmlFile, get: " + req.uri());
                String callback = req.params().get("callback");
                if (callback == null) {
                    callback = req.params().get("c");
                    if (callback == null) {
                        req.response().setStatusCode(500);
                        req.response().end("\"callback\" parameter required\n");
                        return;
                    }
                }

                String sessionID = req.params().get("param0");
                Session session = getSession(config.getLong("session_timeout"), config.getLong("heartbeat_period"), sessionID, sockHandler);
                session.setInfo(req.localAddress(), req.remoteAddress(), req.uri(), req.headers());
                session.register(new HtmlFileListener(config.getInteger("max_bytes_streaming"), req, callback, session));
            }
        });
    }

    private class HtmlFileListener extends BaseListener {

        final int maxBytesStreaming;
        final HttpServerRequest req;
        final String callback;
        final Session session;
        boolean headersWritten;
        int bytesSent;
        boolean closed;

        HtmlFileListener(int maxBytesStreaming, HttpServerRequest req, String callback, Session session) {
            this.maxBytesStreaming = maxBytesStreaming;
            this.req = req;
            this.callback = callback;
            this.session = session;
            addCloseHandler(req.response(), session);
        }

        public void sendFrame(String body) {
            if (log.isTraceEnabled()) log.trace("HtmlFile, sending frame");
            if (!headersWritten) {
                String htmlFile = HTML_FILE_TEMPLATE.replace("{{ callback }}", callback);
                req.response().headers().set("Content-Type", "text/html; charset=UTF-8");
                setNoCacheHeaders(req);
                req.response().setChunked(true);
                setJSESSIONID(config, req);
                req.response().write(htmlFile);
                headersWritten = true;
            }
            body = escapeForJavaScript(body);
            StringBuilder sb = new StringBuilder();
            sb.append("\r\n");
            Buffer buff = new Buffer(sb.toString());
            req.response().write(buff);
            bytesSent += buff.length();
            if (bytesSent >= maxBytesStreaming) {
                if (log.isTraceEnabled()) log.trace("More than maxBytes sent so closing connection");
                // Reset and close the connection
                close();
            }
        }

        public void close() {
            if (!closed) {
                try {
                    session.resetListener();
                    req.response().end();
                    req.response().close();
                    closed = true;
                } catch (IllegalStateException e) {
                    // Underlying connection might already be closed - that's fine
                }
            }
        }
    }
}