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/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* or .
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.web.websocket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.websocket.Extension;
import org.smallmind.nutsnbolts.http.Base64Codec;
import org.smallmind.nutsnbolts.security.EncryptionUtility;
import org.smallmind.nutsnbolts.security.HashAlgorithm;
import org.smallmind.nutsnbolts.util.Tuple;
public class Handshake {
private static final Pattern HTTP_STATUS_PATTERN = Pattern.compile("HTTP/(\\d+\\.\\d+)\\s(\\d+)\\s(.+)");
private static final Pattern HTTP_HEADER_PATTERN = Pattern.compile("([^:]+):\\s*(.+)\\s*");
public static Tuple constructHeaders (int protocolVersion, URI uri, byte[] keyBytes, Extension[] extensions, String... protocols)
throws IOException {
Tuple headerTuple = new Tuple<>();
String extesnionsValue;
headerTuple.addPair("Host", new StringBuilder(uri.getHost().toLowerCase()).append(':').append((uri.getPort() != -1) ? uri.getPort() : uri.getScheme().equals("ws") ? 80 : 443).toString());
headerTuple.addPair("Upgrade", "websocket");
headerTuple.addPair("Connection", "Upgrade");
headerTuple.addPair("Sec-WebSocket-Key", Base64Codec.encode(keyBytes));
headerTuple.addPair("Sec-WebSocket-Version", String.valueOf(protocolVersion));
if ((protocols != null) && (protocols.length > 0)) {
StringBuilder protocolBuilder = new StringBuilder();
for (String protocol : protocols) {
if (protocolBuilder.length() > 0) {
protocolBuilder.append(',');
}
protocolBuilder.append(protocol);
}
headerTuple.addPair("Sec-WebSocket-Protocol", protocolBuilder.toString());
}
if ((extesnionsValue = HandshakeResponse.getExtensionsAsString(extensions)) != null) {
headerTuple.addPair("Sec-WebSocket-Extensions", extesnionsValue);
}
return headerTuple;
}
public static byte[] constructRequest (URI uri, Tuple headerTuple) {
StringBuilder handshakeBuilder = new StringBuilder();
handshakeBuilder.append("GET ").append((uri.getPath() == null) || (uri.getPath().length() == 0) ? "/" : uri.getPath());
if ((uri.getQuery() != null) && (uri.getQuery().length() > 0)) {
handshakeBuilder.append('?').append(uri.getQuery());
}
handshakeBuilder.append(" HTTP/1.1").append('\n');
for (String key : headerTuple.getKeys()) {
for (String value : headerTuple.getValues(key)) {
handshakeBuilder.append(key).append(": ").append(value).append('\n');
}
}
handshakeBuilder.append('\n');
return handshakeBuilder.toString().getBytes(StandardCharsets.UTF_8);
}
public static HandshakeResponse validateResponse (Tuple headerTuple, String response, byte[] keyBytes, Extension[] installedExtensions, String... protocols)
throws IOException, NoSuchAlgorithmException, SyntaxException {
BufferedReader reader = new BufferedReader(new StringReader(response));
Matcher httpStatusMatcher;
Extension[] negotiatedExtensions = null;
LinkedList negotiatedExtensionList = new LinkedList<>();
String httpStatus;
String httpField;
String negotiatedProtocol = "";
do {
httpStatus = reader.readLine();
} while ((httpStatus != null) && (httpStatus.length() == 0));
if (httpStatus == null) {
throw new SyntaxException("The handshake response could not be parsed");
}
if (!(httpStatusMatcher = HTTP_STATUS_PATTERN.matcher(httpStatus)).matches()) {
throw new SyntaxException("The http status line(%s) of the handshake response could not be parsed", httpStatus);
}
if (!httpStatusMatcher.group(2).equals("101")) {
throw new SyntaxException("Incorrect http status code(%s) in the handshake response", httpStatusMatcher.group(2));
}
while (((httpField = reader.readLine()) != null) && (httpField.length() > 0)) {
Matcher fieldMatcher;
if (!(fieldMatcher = HTTP_HEADER_PATTERN.matcher(httpField)).matches()) {
throw new SyntaxException("The http header line(%s) of the handshake response could not be parsed", httpField);
}
if (!headerTuple.containsKey(fieldMatcher.group(1))) {
headerTuple.addPair(fieldMatcher.group(1), fieldMatcher.group(2));
}
}
if (!headerTuple.containsKey("Upgrade")) {
throw new SyntaxException("The http header does not contain an 'Upgrade' field");
}
if (!headerTuple.getValue("Upgrade").equalsIgnoreCase("websocket")) {
throw new SyntaxException("The 'Upgrade' field(%s) of the http header does not contain the value 'websocket'", headerTuple.getValue("Upgrade"));
}
if (!headerTuple.containsKey("Connection")) {
throw new SyntaxException("The http header does not contain a 'Connection' field");
}
if (!headerTuple.getValue("Connection").equalsIgnoreCase("upgrade")) {
throw new SyntaxException("The 'Connection' field(%s) of the http header does not contain the value 'upgrade'", headerTuple.getValue("Connection"));
}
if (!headerTuple.containsKey("Sec-WebSocket-Accept")) {
throw new SyntaxException("The http header does not contain a 'Sec-WebSocket-Accept' field");
}
if (!headerTuple.getValue("Sec-WebSocket-Accept").equals(Base64Codec.encode(EncryptionUtility.hash(HashAlgorithm.SHA_1, (Base64Codec.encode(keyBytes) + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes(StandardCharsets.UTF_8))))) {
throw new SyntaxException("The 'Sec-WebSocket-Accept' field(%s) of the http header does not contain the correct value", headerTuple.getValue("Sec-WebSocket-Accept"));
}
if (headerTuple.containsKey("Sec-WebSocket-Protocol")) {
String headerProtocol = headerTuple.getValue("Sec-WebSocket-Protocol");
boolean matched = false;
for (String protocol : protocols) {
if (protocol.equals(headerProtocol)) {
negotiatedProtocol = protocol;
matched = true;
break;
}
}
if (!matched) {
throw new SyntaxException("The 'Sec-WebSocket-Protocol' field(%s) of the http header does not contain one of the requested sub-protocols", headerProtocol);
}
}
if (headerTuple.containsKey("Sec-WebSocket-Extensions")) {
for (String extensionValue : headerTuple.getValues("Sec-WebSocket-Extensions")) {
String[] splitExtensionValues;
if ((splitExtensionValues = extensionValue.split(",", -1)).length == 0) {
throw new SyntaxException("The 'Sec-WebSocket-Extensions' contains an empty header value");
}
for (String splitExtensionValue : splitExtensionValues) {
String[] splitParameterValues = splitExtensionValue.split(";", -1);
if (splitParameterValues.length > 0) {
LinkedList parameterList = new LinkedList<>();
ExtensionParameter[] parameters;
String extensionName;
if ((extensionName = splitParameterValues[0].trim()).isEmpty()) {
throw new SyntaxException("The 'Sec-WebSocket-Extensions' contains an empty extension name");
}
if (splitParameterValues.length > 1) {
for (int index = 1; index < splitParameterValues.length; index++) {
int equalsPos;
if ((equalsPos = splitParameterValues[index].indexOf('=')) >= 0) {
String parameterName;
String parameterValue;
if ((parameterName = splitParameterValues[index].substring(0, equalsPos).trim()).isEmpty()) {
throw new SyntaxException("The 'Sec-WebSocket-Extensions' contains an empty parameter name");
}
if ((parameterValue = splitParameterValues[index].substring(equalsPos + 1).trim()).isEmpty()) {
throw new SyntaxException("The 'Sec-WebSocket-Extensions' contains an empty parameter value");
}
parameterList.add(new ExtensionParameter(parameterName, parameterValue));
}
}
}
parameters = new ExtensionParameter[parameterList.size()];
parameterList.toArray(parameters);
for (Extension installedExtension : installedExtensions) {
if (installedExtension.getName().equals(extensionName)) {
negotiatedExtensionList.add(installedExtension);
break;
}
}
}
}
negotiatedExtensions = new Extension[negotiatedExtensionList.size()];
negotiatedExtensionList.toArray(negotiatedExtensions);
}
}
return new HandshakeResponse(negotiatedProtocol, negotiatedExtensions);
}
}
