Source Code Cross Referenced for Http.java in  » Web-Server » pygmy-httpd » pygmy » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » pygmy httpd » pygmy.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package pygmy.core;
002:
003:        import java.util.*;
004:        import java.text.SimpleDateFormat;
005:        import java.text.ParseException;
006:        import java.io.File;
007:        import java.io.UnsupportedEncodingException;
008:        import java.io.IOException;
009:        import java.io.FilePermission;
010:        import java.net.*;
011:        import java.security.PermissionCollection;
012:
013:        /**
014:         * Utility class for HTTP error codes, and other command HTTP tasks.
015:         */
016:        public class Http {
017:
018:            private static HashMap codesMap = new HashMap();
019:
020:            private static HashMap htmlCharacterEncodings = new HashMap();
021:
022:            private static SimpleDateFormat dateFormat;
023:
024:            public static final String CRLF = "\r\n";
025:
026:            static {
027:                dateFormat = new SimpleDateFormat(
028:                        "EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
029:                dateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
030:                dateFormat.setLenient(true);
031:            }
032:
033:            static {
034:                htmlCharacterEncodings.put("&", "amp");
035:                htmlCharacterEncodings.put("<", "lt");
036:                htmlCharacterEncodings.put(">", "gt");
037:                htmlCharacterEncodings.put("\"", "quot");
038:                htmlCharacterEncodings.put("'", "apos");
039:            }
040:
041:            static {
042:                codesMap.put(new Integer(100), "Continue");
043:                codesMap.put(new Integer(101), "Switching Protocols");
044:                codesMap.put(new Integer(200), "OK");
045:                codesMap.put(new Integer(201), "Created");
046:                codesMap.put(new Integer(202), "Accepted");
047:                codesMap.put(new Integer(203), "Non-Authoritative Information");
048:                codesMap.put(new Integer(204), "No Content");
049:                codesMap.put(new Integer(205), "Reset Content");
050:                codesMap.put(new Integer(206), "Partial Content");
051:                codesMap.put(new Integer(300), "Multiple Choices");
052:                codesMap.put(new Integer(301), "Moved Permanently");
053:                codesMap.put(new Integer(302), "Moved Temporarily");
054:                codesMap.put(new Integer(303), "See Other");
055:                codesMap.put(new Integer(304), "Not Modified");
056:                codesMap.put(new Integer(305), "Use Proxy");
057:                codesMap.put(new Integer(400), "Bad Request");
058:                codesMap.put(new Integer(401), "Unauthorized");
059:                codesMap.put(new Integer(402), "Payment Required");
060:                codesMap.put(new Integer(403), "Forbidden");
061:                codesMap.put(new Integer(404), "Not Found");
062:                codesMap.put(new Integer(405), "Method Not Allowed");
063:                codesMap.put(new Integer(406), "Not Acceptable");
064:                codesMap.put(new Integer(407), "Proxy Authentication Required");
065:                codesMap.put(new Integer(408), "Request Time-out");
066:                codesMap.put(new Integer(409), "Conflict");
067:                codesMap.put(new Integer(410), "Gone");
068:                codesMap.put(new Integer(411), "Length Required");
069:                codesMap.put(new Integer(412), "Precondition Failed");
070:                codesMap.put(new Integer(413), "Request Entity Too Large");
071:                codesMap.put(new Integer(414), "Request-URI Too Large");
072:                codesMap.put(new Integer(415), "Unsupported Media Type");
073:                codesMap.put(new Integer(500), "Server Error");
074:                codesMap.put(new Integer(501), "Not Implemented");
075:                codesMap.put(new Integer(502), "Bad Gateway");
076:                codesMap.put(new Integer(503), "Service Unavailable");
077:                codesMap.put(new Integer(504), "Gateway Time-out");
078:                codesMap.put(new Integer(505), "HTTP Version not supported");
079:            }
080:
081:            /**
082:             * Given a HTTP response code, this method will return the english phrase.
083:             *
084:             * @param code the HTTP response code to look up.
085:             * @return A string describing what the HTTP response code is.
086:             */
087:            public static String getStatusPhrase(int code) {
088:                String phrase = (String) codesMap.get(new Integer(code));
089:                if (phrase == null) {
090:                    return "Error";
091:                }
092:
093:                return phrase;
094:            }
095:
096:            /**
097:             * This encodes the message into Html.  It encodes characters '&', ''', '<', '>', and '"' into &amp;, &apos;,
098:             * &lt;, &gt;, and &quot;.
099:             *
100:             * @param message the message to encode.
101:             * @return the encoded message.
102:             */
103:            public static String encodeHtml(String message) {
104:                StringBuffer result = new StringBuffer();
105:
106:                for (int i = 0; i < message.length(); i++) {
107:                    String tmp = Character.toString(message.charAt(i));
108:                    if (htmlCharacterEncodings.containsKey(tmp)) {
109:                        result.append("&");
110:                        result.append(htmlCharacterEncodings.get(tmp));
111:                        result.append(";");
112:                    } else {
113:                        result.append(tmp);
114:                    }
115:                }
116:                return result.toString();
117:            }
118:
119:            /**
120:             * This creates the current time as a string conforming to a HTTP date following the format
121:             * <i>EEE, dd MMM yyyy HH:mm:ss z</i>.
122:             * @return The a HTTP formated string of the current time.
123:             */
124:            public static String getCurrentTime() {
125:                return formatTime(System.currentTimeMillis());
126:            }
127:
128:            /**
129:             * This formats the given time as a HTTP formatted string.  The format is  <i>EEE, dd MMM yyyy HH:mm:ss z</i>.
130:             * @param time the time to format into a string.
131:             * @return the formatted date.
132:             */
133:            public static String formatTime(long time) {
134:                return dateFormat.format(new Date(time)).substring(0, 29);
135:            }
136:
137:            /**
138:             * This parses the given time as a HTTP formatted string.
139:             * @param date The date represented as the format String <i>EEE, dd MMM yyyy HH:mm:ss z</i>.
140:             * @return the time in milliseconds.
141:             * @throws ParseException throws this exeception when it cannot parse the date.
142:             */
143:            public static long parseTime(String date) throws ParseException {
144:                return dateFormat.parse(date).getTime();
145:            }
146:
147:            /**
148:             * Takes two paths a joins them together properly adding the '/' charater between them.
149:             *
150:             * @param path the first part of the path.
151:             * @param relativePath the second part to join to the first path.
152:             * @return the combined path of path and relativePath.
153:             */
154:            public static String join(String path, String relativePath) {
155:                boolean pathEnds = path.endsWith("/");
156:                boolean relativeStarts = relativePath.startsWith("/");
157:                if ((pathEnds && !relativeStarts)
158:                        || (!relativeStarts && pathEnds)) {
159:                    return path + relativePath;
160:                } else if (pathEnds && relativeStarts) {
161:                    return path + relativePath.substring(1);
162:                } else {
163:                    return path + "/" + relativePath;
164:                }
165:            }
166:
167:            /**
168:             * This translates a url into a path on the filesystem.  This decodes the url using the URLDecoder class, and
169:             * creates an absolute path beginning with root.
170:             *
171:             * @param root this is an absolute path to prepend onto the url.
172:             * @param url the url to resolve into the filesystem.
173:             * @return the a File object representing this URL.
174:             * @throws UnsupportedEncodingException
175:             */
176:            public static File translatePath(String root, String url)
177:                    throws UnsupportedEncodingException {
178:                String name = URLDecoder.decode(url, "UTF-8");
179:                name = name.replace('/', File.separatorChar);
180:                File file = new File(root, name);
181:                return file;
182:            }
183:
184:            public static boolean isSecure(String root, File file)
185:                    throws IOException {
186:                PermissionCollection rootDirectory;
187:                if (root.endsWith(File.separator)) {
188:                    FilePermission fp = new FilePermission(root + "-", "read");
189:                    rootDirectory = fp.newPermissionCollection();
190:                    rootDirectory.add(fp);
191:                    rootDirectory.add(new FilePermission(root.substring(0, root
192:                            .length() - 1), "read"));
193:                } else {
194:                    FilePermission fp = new FilePermission(root, "read");
195:                    rootDirectory = fp.newPermissionCollection();
196:                    rootDirectory.add(fp);
197:                    rootDirectory.add(new FilePermission(root + File.separator
198:                            + "-", "read"));
199:                }
200:                return (rootDirectory.implies(new FilePermission(file
201:                        .getCanonicalPath(), "read")));
202:            }
203:
204:            /**
205:             * This method tries to find a suitable InetAddress that is routable.  It calls {@link java.net.InetAddress#getLocalHost}
206:             * to find the local host.  If that address it a site local address (192.168.*.*, 10.*.*.*, or 172.16.*.*) or the
207:             * loopback address (127.0.0.1), it enumerates all the NetworkInterfaces, and tries to find an address that is
208:             * not site local or loopback address.  If it cannot it simply returns whatever {@link InetAddress#getLocalHost}.
209:             * @return the address of a non site local or non loopback address, unless there is only loopback or site local addresses.
210:             * @throws UnknownHostException
211:             * @throws SocketException
212:             */
213:            public static InetAddress findRoutableHostAddress()
214:                    throws UnknownHostException, SocketException {
215:                InetAddress localAddress = InetAddress.getLocalHost();
216:                if (localAddress.isSiteLocalAddress()
217:                        || localAddress.isLoopbackAddress()) {
218:                    for (Enumeration networkEnum = NetworkInterface
219:                            .getNetworkInterfaces(); networkEnum
220:                            .hasMoreElements();) {
221:                        NetworkInterface netInterface = (NetworkInterface) networkEnum
222:                                .nextElement();
223:                        for (Enumeration inetAddressEnum = netInterface
224:                                .getInetAddresses(); inetAddressEnum
225:                                .hasMoreElements();) {
226:                            InetAddress address = (InetAddress) inetAddressEnum
227:                                    .nextElement();
228:                            if (!address.isSiteLocalAddress()
229:                                    && !address.isLoopbackAddress()) {
230:                                return address;
231:                            }
232:                        }
233:                    }
234:                }
235:                return localAddress;
236:            }
237:
238:            public static List findAllHostAddresses(boolean includeLoopback)
239:                    throws SocketException {
240:                List addresses = new ArrayList();
241:                for (Enumeration networkEnum = NetworkInterface
242:                        .getNetworkInterfaces(); networkEnum.hasMoreElements();) {
243:                    NetworkInterface netInterface = (NetworkInterface) networkEnum
244:                            .nextElement();
245:                    for (Enumeration inetAddressEnum = netInterface
246:                            .getInetAddresses(); inetAddressEnum
247:                            .hasMoreElements();) {
248:                        InetAddress address = (InetAddress) inetAddressEnum
249:                                .nextElement();
250:                        if (includeLoopback || !address.isLoopbackAddress()) {
251:                            addresses.add(address);
252:                        }
253:                    }
254:                }
255:                return addresses;
256:            }
257:
258:        }
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