WebSocketServerIndexPage

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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.netty5.example.http.websocketx.server;

import io.netty5.buffer.api.Buffer;
import io.netty5.buffer.api.BufferAllocator;

import static java.nio.charset.StandardCharsets.US_ASCII;

/**
 * Generates the demo HTML page which is served at http://localhost:8080/
 */
public final class WebSocketServerIndexPage {

    private static final String NEWLINE = "\r\n";

    public static Buffer getContent(BufferAllocator allocator, String webSocketLocation) {
        final String content = "<html><head><title>Web Socket Test</title></head>" + NEWLINE +
                "<body>" + NEWLINE +
                "<script type=\"text/javascript\">" + NEWLINE +
                "var socket;" + NEWLINE +
                "if (!window.WebSocket) {" + NEWLINE +
                "  window.WebSocket = window.MozWebSocket;" + NEWLINE +
                '}' + NEWLINE +
                "if (window.WebSocket) {" + NEWLINE +
                "  socket = new WebSocket(\"" + webSocketLocation + "\");" + NEWLINE +
                "  socket.onmessage = function(event) {" + NEWLINE +
                "    var ta = document.getElementById('responseText');" + NEWLINE +
                "    ta.value = ta.value + '\\n' + event.data" + NEWLINE +
                "  };" + NEWLINE +
                "  socket.onopen = function(event) {" + NEWLINE +
                "    var ta = document.getElementById('responseText');" + NEWLINE +
                "    ta.value = \"Web Socket opened!\";" + NEWLINE +
                "  };" + NEWLINE +
                "  socket.onclose = function(event) {" + NEWLINE +
                "    var ta = document.getElementById('responseText');" + NEWLINE +
                "    ta.value = ta.value + \"Web Socket closed\"; " + NEWLINE +
                "  };" + NEWLINE +
                "} else {" + NEWLINE +
                "  alert(\"Your browser does not support Web Socket.\");" + NEWLINE +
                '}' + NEWLINE +
                NEWLINE +
                "function send(message) {" + NEWLINE +
                "  if (!window.WebSocket) { return; }" + NEWLINE +
                "  if (socket.readyState == WebSocket.OPEN) {" + NEWLINE +
                "    socket.send(message);" + NEWLINE +
                "  } else {" + NEWLINE +
                "    alert(\"The socket is not open.\");" + NEWLINE +
                "  }" + NEWLINE +
                '}' + NEWLINE +
                "</script>" + NEWLINE +
                "<form onsubmit=\"return false;\">" + NEWLINE +
                "<input type=\"text\" name=\"message\" value=\"Hello, World!\"/>" +
                "<input type=\"button\" value=\"Send Web Socket Data\"" + NEWLINE +
                "       onclick=\"send(this.form.message.value)\" />" + NEWLINE +
                "<h3>Output</h3>" + NEWLINE +
                "<textarea id=\"responseText\" style=\"width:500px;height:300px;\"></textarea>" + NEWLINE +
                "</form>" + NEWLINE +
                "</body>" + NEWLINE +
                "</html>" + NEWLINE;
        return allocator.copyOf(content, US_ASCII);
    }

    private WebSocketServerIndexPage() {
        // Unused
    }
}