| /** |
| * $RCSfile$ |
| * $Revision$ |
| * $Date$ |
| * |
| * Copyright 2003-2007 Jive Software. |
| * |
| * All rights reserved. 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 org.jivesoftware.smack.util; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.text.DateFormat; |
| import java.text.ParseException; |
| import java.text.SimpleDateFormat; |
| import java.util.ArrayList; |
| import java.util.Calendar; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Random; |
| import java.util.TimeZone; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * A collection of utility methods for String objects. |
| */ |
| public class StringUtils { |
| |
| /** |
| * Date format as defined in XEP-0082 - XMPP Date and Time Profiles. The time zone is set to |
| * UTC. |
| * <p> |
| * Date formats are not synchronized. Since multiple threads access the format concurrently, it |
| * must be synchronized externally or you can use the convenience methods |
| * {@link #parseXEP0082Date(String)} and {@link #formatXEP0082Date(Date)}. |
| * @deprecated This public version will be removed in favor of using the methods defined within this class. |
| */ |
| public static final DateFormat XEP_0082_UTC_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); |
| |
| /* |
| * private version to use internally so we don't have to be concerned with thread safety. |
| */ |
| private static final DateFormat dateFormatter = DateFormatType.XEP_0082_DATE_PROFILE.createFormatter(); |
| private static final Pattern datePattern = Pattern.compile("^\\d+-\\d+-\\d+$"); |
| |
| private static final DateFormat timeFormatter = DateFormatType.XEP_0082_TIME_MILLIS_ZONE_PROFILE.createFormatter(); |
| private static final Pattern timePattern = Pattern.compile("^(\\d+:){2}\\d+.\\d+(Z|([+-](\\d+:\\d+)))$"); |
| private static final DateFormat timeNoZoneFormatter = DateFormatType.XEP_0082_TIME_MILLIS_PROFILE.createFormatter(); |
| private static final Pattern timeNoZonePattern = Pattern.compile("^(\\d+:){2}\\d+.\\d+$"); |
| |
| private static final DateFormat timeNoMillisFormatter = DateFormatType.XEP_0082_TIME_ZONE_PROFILE.createFormatter(); |
| private static final Pattern timeNoMillisPattern = Pattern.compile("^(\\d+:){2}\\d+(Z|([+-](\\d+:\\d+)))$"); |
| private static final DateFormat timeNoMillisNoZoneFormatter = DateFormatType.XEP_0082_TIME_PROFILE.createFormatter(); |
| private static final Pattern timeNoMillisNoZonePattern = Pattern.compile("^(\\d+:){2}\\d+$"); |
| |
| private static final DateFormat dateTimeFormatter = DateFormatType.XEP_0082_DATETIME_MILLIS_PROFILE.createFormatter(); |
| private static final Pattern dateTimePattern = Pattern.compile("^\\d+(-\\d+){2}+T(\\d+:){2}\\d+.\\d+(Z|([+-](\\d+:\\d+)))?$"); |
| private static final DateFormat dateTimeNoMillisFormatter = DateFormatType.XEP_0082_DATETIME_PROFILE.createFormatter(); |
| private static final Pattern dateTimeNoMillisPattern = Pattern.compile("^\\d+(-\\d+){2}+T(\\d+:){2}\\d+(Z|([+-](\\d+:\\d+)))?$"); |
| |
| private static final DateFormat xep0091Formatter = new SimpleDateFormat("yyyyMMdd'T'HH:mm:ss"); |
| private static final DateFormat xep0091Date6DigitFormatter = new SimpleDateFormat("yyyyMd'T'HH:mm:ss"); |
| private static final DateFormat xep0091Date7Digit1MonthFormatter = new SimpleDateFormat("yyyyMdd'T'HH:mm:ss"); |
| private static final DateFormat xep0091Date7Digit2MonthFormatter = new SimpleDateFormat("yyyyMMd'T'HH:mm:ss"); |
| private static final Pattern xep0091Pattern = Pattern.compile("^\\d+T\\d+:\\d+:\\d+$"); |
| |
| private static final List<PatternCouplings> couplings = new ArrayList<PatternCouplings>(); |
| |
| static { |
| TimeZone utc = TimeZone.getTimeZone("UTC"); |
| XEP_0082_UTC_FORMAT.setTimeZone(utc); |
| dateFormatter.setTimeZone(utc); |
| timeFormatter.setTimeZone(utc); |
| timeNoZoneFormatter.setTimeZone(utc); |
| timeNoMillisFormatter.setTimeZone(utc); |
| timeNoMillisNoZoneFormatter.setTimeZone(utc); |
| dateTimeFormatter.setTimeZone(utc); |
| dateTimeNoMillisFormatter.setTimeZone(utc); |
| |
| xep0091Formatter.setTimeZone(utc); |
| xep0091Date6DigitFormatter.setTimeZone(utc); |
| xep0091Date7Digit1MonthFormatter.setTimeZone(utc); |
| xep0091Date7Digit1MonthFormatter.setLenient(false); |
| xep0091Date7Digit2MonthFormatter.setTimeZone(utc); |
| xep0091Date7Digit2MonthFormatter.setLenient(false); |
| |
| couplings.add(new PatternCouplings(datePattern, dateFormatter)); |
| couplings.add(new PatternCouplings(dateTimePattern, dateTimeFormatter, true)); |
| couplings.add(new PatternCouplings(dateTimeNoMillisPattern, dateTimeNoMillisFormatter, true)); |
| couplings.add(new PatternCouplings(timePattern, timeFormatter, true)); |
| couplings.add(new PatternCouplings(timeNoZonePattern, timeNoZoneFormatter)); |
| couplings.add(new PatternCouplings(timeNoMillisPattern, timeNoMillisFormatter, true)); |
| couplings.add(new PatternCouplings(timeNoMillisNoZonePattern, timeNoMillisNoZoneFormatter)); |
| } |
| |
| private static final char[] QUOTE_ENCODE = """.toCharArray(); |
| private static final char[] APOS_ENCODE = "'".toCharArray(); |
| private static final char[] AMP_ENCODE = "&".toCharArray(); |
| private static final char[] LT_ENCODE = "<".toCharArray(); |
| private static final char[] GT_ENCODE = ">".toCharArray(); |
| |
| /** |
| * Parses the given date string in the <a href="http://xmpp.org/extensions/xep-0082.html">XEP-0082 - XMPP Date and Time Profiles</a>. |
| * |
| * @param dateString the date string to parse |
| * @return the parsed Date |
| * @throws ParseException if the specified string cannot be parsed |
| * @deprecated Use {@link #parseDate(String)} instead. |
| * |
| */ |
| public static Date parseXEP0082Date(String dateString) throws ParseException { |
| return parseDate(dateString); |
| } |
| |
| /** |
| * Parses the given date string in either of the three profiles of <a href="http://xmpp.org/extensions/xep-0082.html">XEP-0082 - XMPP Date and Time Profiles</a> |
| * or <a href="http://xmpp.org/extensions/xep-0091.html">XEP-0091 - Legacy Delayed Delivery</a> format. |
| * <p> |
| * This method uses internal date formatters and is thus threadsafe. |
| * @param dateString the date string to parse |
| * @return the parsed Date |
| * @throws ParseException if the specified string cannot be parsed |
| */ |
| public static Date parseDate(String dateString) throws ParseException { |
| Matcher matcher = xep0091Pattern.matcher(dateString); |
| |
| /* |
| * if date is in XEP-0091 format handle ambiguous dates missing the |
| * leading zero in month and day |
| */ |
| if (matcher.matches()) { |
| int length = dateString.split("T")[0].length(); |
| |
| if (length < 8) { |
| Date date = handleDateWithMissingLeadingZeros(dateString, length); |
| |
| if (date != null) |
| return date; |
| } |
| else { |
| synchronized (xep0091Formatter) { |
| return xep0091Formatter.parse(dateString); |
| } |
| } |
| } |
| else { |
| for (PatternCouplings coupling : couplings) { |
| matcher = coupling.pattern.matcher(dateString); |
| |
| if (matcher.matches()) |
| { |
| if (coupling.needToConvertTimeZone) { |
| dateString = coupling.convertTime(dateString); |
| } |
| |
| synchronized (coupling.formatter) { |
| return coupling.formatter.parse(dateString); |
| } |
| } |
| } |
| } |
| |
| /* |
| * We assume it is the XEP-0082 DateTime profile with no milliseconds at this point. If it isn't, is is just not parseable, then we attempt |
| * to parse it regardless and let it throw the ParseException. |
| */ |
| synchronized (dateTimeNoMillisFormatter) { |
| return dateTimeNoMillisFormatter.parse(dateString); |
| } |
| } |
| |
| /** |
| * Parses the given date string in different ways and returns the date that |
| * lies in the past and/or is nearest to the current date-time. |
| * |
| * @param stampString date in string representation |
| * @param dateLength |
| * @param noFuture |
| * @return the parsed date |
| * @throws ParseException The date string was of an unknown format |
| */ |
| private static Date handleDateWithMissingLeadingZeros(String stampString, int dateLength) throws ParseException { |
| if (dateLength == 6) { |
| synchronized (xep0091Date6DigitFormatter) { |
| return xep0091Date6DigitFormatter.parse(stampString); |
| } |
| } |
| Calendar now = Calendar.getInstance(); |
| |
| Calendar oneDigitMonth = parseXEP91Date(stampString, xep0091Date7Digit1MonthFormatter); |
| Calendar twoDigitMonth = parseXEP91Date(stampString, xep0091Date7Digit2MonthFormatter); |
| |
| List<Calendar> dates = filterDatesBefore(now, oneDigitMonth, twoDigitMonth); |
| |
| if (!dates.isEmpty()) { |
| return determineNearestDate(now, dates).getTime(); |
| } |
| return null; |
| } |
| |
| private static Calendar parseXEP91Date(String stampString, DateFormat dateFormat) { |
| try { |
| synchronized (dateFormat) { |
| dateFormat.parse(stampString); |
| return dateFormat.getCalendar(); |
| } |
| } |
| catch (ParseException e) { |
| return null; |
| } |
| } |
| |
| private static List<Calendar> filterDatesBefore(Calendar now, Calendar... dates) { |
| List<Calendar> result = new ArrayList<Calendar>(); |
| |
| for (Calendar calendar : dates) { |
| if (calendar != null && calendar.before(now)) { |
| result.add(calendar); |
| } |
| } |
| |
| return result; |
| } |
| |
| private static Calendar determineNearestDate(final Calendar now, List<Calendar> dates) { |
| |
| Collections.sort(dates, new Comparator<Calendar>() { |
| |
| public int compare(Calendar o1, Calendar o2) { |
| Long diff1 = new Long(now.getTimeInMillis() - o1.getTimeInMillis()); |
| Long diff2 = new Long(now.getTimeInMillis() - o2.getTimeInMillis()); |
| return diff1.compareTo(diff2); |
| } |
| |
| }); |
| |
| return dates.get(0); |
| } |
| |
| /** |
| * Formats a Date into a XEP-0082 - XMPP Date and Time Profiles string. |
| * |
| * @param date the time value to be formatted into a time string |
| * @return the formatted time string in XEP-0082 format |
| */ |
| public static String formatXEP0082Date(Date date) { |
| synchronized (dateTimeFormatter) { |
| return dateTimeFormatter.format(date); |
| } |
| } |
| |
| public static String formatDate(Date toFormat, DateFormatType type) |
| { |
| return null; |
| } |
| |
| /** |
| * Returns the name portion of a XMPP address. For example, for the |
| * address "matt@jivesoftware.com/Smack", "matt" would be returned. If no |
| * username is present in the address, the empty string will be returned. |
| * |
| * @param XMPPAddress the XMPP address. |
| * @return the name portion of the XMPP address. |
| */ |
| public static String parseName(String XMPPAddress) { |
| if (XMPPAddress == null) { |
| return null; |
| } |
| int atIndex = XMPPAddress.lastIndexOf("@"); |
| if (atIndex <= 0) { |
| return ""; |
| } |
| else { |
| return XMPPAddress.substring(0, atIndex); |
| } |
| } |
| |
| /** |
| * Returns the server portion of a XMPP address. For example, for the |
| * address "matt@jivesoftware.com/Smack", "jivesoftware.com" would be returned. |
| * If no server is present in the address, the empty string will be returned. |
| * |
| * @param XMPPAddress the XMPP address. |
| * @return the server portion of the XMPP address. |
| */ |
| public static String parseServer(String XMPPAddress) { |
| if (XMPPAddress == null) { |
| return null; |
| } |
| int atIndex = XMPPAddress.lastIndexOf("@"); |
| // If the String ends with '@', return the empty string. |
| if (atIndex + 1 > XMPPAddress.length()) { |
| return ""; |
| } |
| int slashIndex = XMPPAddress.indexOf("/"); |
| if (slashIndex > 0 && slashIndex > atIndex) { |
| return XMPPAddress.substring(atIndex + 1, slashIndex); |
| } |
| else { |
| return XMPPAddress.substring(atIndex + 1); |
| } |
| } |
| |
| /** |
| * Returns the resource portion of a XMPP address. For example, for the |
| * address "matt@jivesoftware.com/Smack", "Smack" would be returned. If no |
| * resource is present in the address, the empty string will be returned. |
| * |
| * @param XMPPAddress the XMPP address. |
| * @return the resource portion of the XMPP address. |
| */ |
| public static String parseResource(String XMPPAddress) { |
| if (XMPPAddress == null) { |
| return null; |
| } |
| int slashIndex = XMPPAddress.indexOf("/"); |
| if (slashIndex + 1 > XMPPAddress.length() || slashIndex < 0) { |
| return ""; |
| } |
| else { |
| return XMPPAddress.substring(slashIndex + 1); |
| } |
| } |
| |
| /** |
| * Returns the XMPP address with any resource information removed. For example, |
| * for the address "matt@jivesoftware.com/Smack", "matt@jivesoftware.com" would |
| * be returned. |
| * |
| * @param XMPPAddress the XMPP address. |
| * @return the bare XMPP address without resource information. |
| */ |
| public static String parseBareAddress(String XMPPAddress) { |
| if (XMPPAddress == null) { |
| return null; |
| } |
| int slashIndex = XMPPAddress.indexOf("/"); |
| if (slashIndex < 0) { |
| return XMPPAddress; |
| } |
| else if (slashIndex == 0) { |
| return ""; |
| } |
| else { |
| return XMPPAddress.substring(0, slashIndex); |
| } |
| } |
| |
| /** |
| * Returns true if jid is a full JID (i.e. a JID with resource part). |
| * |
| * @param jid |
| * @return true if full JID, false otherwise |
| */ |
| public static boolean isFullJID(String jid) { |
| if (parseName(jid).length() <= 0 || parseServer(jid).length() <= 0 |
| || parseResource(jid).length() <= 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Escapes the node portion of a JID according to "JID Escaping" (JEP-0106). |
| * Escaping replaces characters prohibited by node-prep with escape sequences, |
| * as follows:<p> |
| * |
| * <table border="1"> |
| * <tr><td><b>Unescaped Character</b></td><td><b>Encoded Sequence</b></td></tr> |
| * <tr><td><space></td><td>\20</td></tr> |
| * <tr><td>"</td><td>\22</td></tr> |
| * <tr><td>&</td><td>\26</td></tr> |
| * <tr><td>'</td><td>\27</td></tr> |
| * <tr><td>/</td><td>\2f</td></tr> |
| * <tr><td>:</td><td>\3a</td></tr> |
| * <tr><td><</td><td>\3c</td></tr> |
| * <tr><td>></td><td>\3e</td></tr> |
| * <tr><td>@</td><td>\40</td></tr> |
| * <tr><td>\</td><td>\5c</td></tr> |
| * </table><p> |
| * |
| * This process is useful when the node comes from an external source that doesn't |
| * conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because |
| * the <space> character isn't a valid part of a node, the username should |
| * be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com" |
| * after case-folding, etc. has been applied).<p> |
| * |
| * All node escaping and un-escaping must be performed manually at the appropriate |
| * time; the JID class will not escape or un-escape automatically. |
| * |
| * @param node the node. |
| * @return the escaped version of the node. |
| */ |
| public static String escapeNode(String node) { |
| if (node == null) { |
| return null; |
| } |
| StringBuilder buf = new StringBuilder(node.length() + 8); |
| for (int i=0, n=node.length(); i<n; i++) { |
| char c = node.charAt(i); |
| switch (c) { |
| case '"': buf.append("\\22"); break; |
| case '&': buf.append("\\26"); break; |
| case '\'': buf.append("\\27"); break; |
| case '/': buf.append("\\2f"); break; |
| case ':': buf.append("\\3a"); break; |
| case '<': buf.append("\\3c"); break; |
| case '>': buf.append("\\3e"); break; |
| case '@': buf.append("\\40"); break; |
| case '\\': buf.append("\\5c"); break; |
| default: { |
| if (Character.isWhitespace(c)) { |
| buf.append("\\20"); |
| } |
| else { |
| buf.append(c); |
| } |
| } |
| } |
| } |
| return buf.toString(); |
| } |
| |
| /** |
| * Un-escapes the node portion of a JID according to "JID Escaping" (JEP-0106).<p> |
| * Escaping replaces characters prohibited by node-prep with escape sequences, |
| * as follows:<p> |
| * |
| * <table border="1"> |
| * <tr><td><b>Unescaped Character</b></td><td><b>Encoded Sequence</b></td></tr> |
| * <tr><td><space></td><td>\20</td></tr> |
| * <tr><td>"</td><td>\22</td></tr> |
| * <tr><td>&</td><td>\26</td></tr> |
| * <tr><td>'</td><td>\27</td></tr> |
| * <tr><td>/</td><td>\2f</td></tr> |
| * <tr><td>:</td><td>\3a</td></tr> |
| * <tr><td><</td><td>\3c</td></tr> |
| * <tr><td>></td><td>\3e</td></tr> |
| * <tr><td>@</td><td>\40</td></tr> |
| * <tr><td>\</td><td>\5c</td></tr> |
| * </table><p> |
| * |
| * This process is useful when the node comes from an external source that doesn't |
| * conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because |
| * the <space> character isn't a valid part of a node, the username should |
| * be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com" |
| * after case-folding, etc. has been applied).<p> |
| * |
| * All node escaping and un-escaping must be performed manually at the appropriate |
| * time; the JID class will not escape or un-escape automatically. |
| * |
| * @param node the escaped version of the node. |
| * @return the un-escaped version of the node. |
| */ |
| public static String unescapeNode(String node) { |
| if (node == null) { |
| return null; |
| } |
| char [] nodeChars = node.toCharArray(); |
| StringBuilder buf = new StringBuilder(nodeChars.length); |
| for (int i=0, n=nodeChars.length; i<n; i++) { |
| compare: { |
| char c = node.charAt(i); |
| if (c == '\\' && i+2<n) { |
| char c2 = nodeChars[i+1]; |
| char c3 = nodeChars[i+2]; |
| if (c2 == '2') { |
| switch (c3) { |
| case '0': buf.append(' '); i+=2; break compare; |
| case '2': buf.append('"'); i+=2; break compare; |
| case '6': buf.append('&'); i+=2; break compare; |
| case '7': buf.append('\''); i+=2; break compare; |
| case 'f': buf.append('/'); i+=2; break compare; |
| } |
| } |
| else if (c2 == '3') { |
| switch (c3) { |
| case 'a': buf.append(':'); i+=2; break compare; |
| case 'c': buf.append('<'); i+=2; break compare; |
| case 'e': buf.append('>'); i+=2; break compare; |
| } |
| } |
| else if (c2 == '4') { |
| if (c3 == '0') { |
| buf.append("@"); |
| i+=2; |
| break compare; |
| } |
| } |
| else if (c2 == '5') { |
| if (c3 == 'c') { |
| buf.append("\\"); |
| i+=2; |
| break compare; |
| } |
| } |
| } |
| buf.append(c); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| /** |
| * Escapes all necessary characters in the String so that it can be used |
| * in an XML doc. |
| * |
| * @param string the string to escape. |
| * @return the string with appropriate characters escaped. |
| */ |
| public static String escapeForXML(String string) { |
| if (string == null) { |
| return null; |
| } |
| char ch; |
| int i=0; |
| int last=0; |
| char[] input = string.toCharArray(); |
| int len = input.length; |
| StringBuilder out = new StringBuilder((int)(len*1.3)); |
| for (; i < len; i++) { |
| ch = input[i]; |
| if (ch > '>') { |
| } |
| else if (ch == '<') { |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| last = i + 1; |
| out.append(LT_ENCODE); |
| } |
| else if (ch == '>') { |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| last = i + 1; |
| out.append(GT_ENCODE); |
| } |
| |
| else if (ch == '&') { |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| // Do nothing if the string is of the form ë (unicode value) |
| if (!(len > i + 5 |
| && input[i + 1] == '#' |
| && Character.isDigit(input[i + 2]) |
| && Character.isDigit(input[i + 3]) |
| && Character.isDigit(input[i + 4]) |
| && input[i + 5] == ';')) { |
| last = i + 1; |
| out.append(AMP_ENCODE); |
| } |
| } |
| else if (ch == '"') { |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| last = i + 1; |
| out.append(QUOTE_ENCODE); |
| } |
| else if (ch == '\'') { |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| last = i + 1; |
| out.append(APOS_ENCODE); |
| } |
| } |
| if (last == 0) { |
| return string; |
| } |
| if (i > last) { |
| out.append(input, last, i - last); |
| } |
| return out.toString(); |
| } |
| |
| /** |
| * Used by the hash method. |
| */ |
| private static MessageDigest digest = null; |
| |
| /** |
| * Hashes a String using the SHA-1 algorithm and returns the result as a |
| * String of hexadecimal numbers. This method is synchronized to avoid |
| * excessive MessageDigest object creation. If calling this method becomes |
| * a bottleneck in your code, you may wish to maintain a pool of |
| * MessageDigest objects instead of using this method. |
| * <p> |
| * A hash is a one-way function -- that is, given an |
| * input, an output is easily computed. However, given the output, the |
| * input is almost impossible to compute. This is useful for passwords |
| * since we can store the hash and a hacker will then have a very hard time |
| * determining the original password. |
| * |
| * @param data the String to compute the hash of. |
| * @return a hashed version of the passed-in String |
| */ |
| public synchronized static String hash(String data) { |
| if (digest == null) { |
| try { |
| digest = MessageDigest.getInstance("SHA-1"); |
| } |
| catch (NoSuchAlgorithmException nsae) { |
| System.err.println("Failed to load the SHA-1 MessageDigest. " + |
| "Jive will be unable to function normally."); |
| } |
| } |
| // Now, compute hash. |
| try { |
| digest.update(data.getBytes("UTF-8")); |
| } |
| catch (UnsupportedEncodingException e) { |
| System.err.println(e); |
| } |
| return encodeHex(digest.digest()); |
| } |
| |
| /** |
| * Encodes an array of bytes as String representation of hexadecimal. |
| * |
| * @param bytes an array of bytes to convert to a hex string. |
| * @return generated hex string. |
| */ |
| public static String encodeHex(byte[] bytes) { |
| StringBuilder hex = new StringBuilder(bytes.length * 2); |
| |
| for (byte aByte : bytes) { |
| if (((int) aByte & 0xff) < 0x10) { |
| hex.append("0"); |
| } |
| hex.append(Integer.toString((int) aByte & 0xff, 16)); |
| } |
| |
| return hex.toString(); |
| } |
| |
| /** |
| * Encodes a String as a base64 String. |
| * |
| * @param data a String to encode. |
| * @return a base64 encoded String. |
| */ |
| public static String encodeBase64(String data) { |
| byte [] bytes = null; |
| try { |
| bytes = data.getBytes("ISO-8859-1"); |
| } |
| catch (UnsupportedEncodingException uee) { |
| uee.printStackTrace(); |
| } |
| return encodeBase64(bytes); |
| } |
| |
| /** |
| * Encodes a byte array into a base64 String. |
| * |
| * @param data a byte array to encode. |
| * @return a base64 encode String. |
| */ |
| public static String encodeBase64(byte[] data) { |
| return encodeBase64(data, false); |
| } |
| |
| /** |
| * Encodes a byte array into a bse64 String. |
| * |
| * @param data The byte arry to encode. |
| * @param lineBreaks True if the encoding should contain line breaks and false if it should not. |
| * @return A base64 encoded String. |
| */ |
| public static String encodeBase64(byte[] data, boolean lineBreaks) { |
| return encodeBase64(data, 0, data.length, lineBreaks); |
| } |
| |
| /** |
| * Encodes a byte array into a bse64 String. |
| * |
| * @param data The byte arry to encode. |
| * @param offset the offset of the bytearray to begin encoding at. |
| * @param len the length of bytes to encode. |
| * @param lineBreaks True if the encoding should contain line breaks and false if it should not. |
| * @return A base64 encoded String. |
| */ |
| public static String encodeBase64(byte[] data, int offset, int len, boolean lineBreaks) { |
| return Base64.encodeBytes(data, offset, len, (lineBreaks ? Base64.NO_OPTIONS : Base64.DONT_BREAK_LINES)); |
| } |
| |
| /** |
| * Decodes a base64 String. |
| * Unlike Base64.decode() this method does not try to detect and decompress a gzip-compressed input. |
| * |
| * @param data a base64 encoded String to decode. |
| * @return the decoded String. |
| */ |
| public static byte[] decodeBase64(String data) { |
| byte[] bytes; |
| try { |
| bytes = data.getBytes("UTF-8"); |
| } catch (java.io.UnsupportedEncodingException uee) { |
| bytes = data.getBytes(); |
| } |
| |
| bytes = Base64.decode(bytes, 0, bytes.length, Base64.NO_OPTIONS); |
| return bytes; |
| } |
| |
| /** |
| * Pseudo-random number generator object for use with randomString(). |
| * The Random class is not considered to be cryptographically secure, so |
| * only use these random Strings for low to medium security applications. |
| */ |
| private static Random randGen = new Random(); |
| |
| /** |
| * Array of numbers and letters of mixed case. Numbers appear in the list |
| * twice so that there is a more equal chance that a number will be picked. |
| * We can use the array to get a random number or letter by picking a random |
| * array index. |
| */ |
| private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" + |
| "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray(); |
| |
| /** |
| * Returns a random String of numbers and letters (lower and upper case) |
| * of the specified length. The method uses the Random class that is |
| * built-in to Java which is suitable for low to medium grade security uses. |
| * This means that the output is only pseudo random, i.e., each number is |
| * mathematically generated so is not truly random.<p> |
| * |
| * The specified length must be at least one. If not, the method will return |
| * null. |
| * |
| * @param length the desired length of the random String to return. |
| * @return a random String of numbers and letters of the specified length. |
| */ |
| public static String randomString(int length) { |
| if (length < 1) { |
| return null; |
| } |
| // Create a char buffer to put random letters and numbers in. |
| char [] randBuffer = new char[length]; |
| for (int i=0; i<randBuffer.length; i++) { |
| randBuffer[i] = numbersAndLetters[randGen.nextInt(71)]; |
| } |
| return new String(randBuffer); |
| } |
| |
| private StringUtils() { |
| // Not instantiable. |
| } |
| |
| private static class PatternCouplings { |
| Pattern pattern; |
| DateFormat formatter; |
| boolean needToConvertTimeZone = false; |
| |
| public PatternCouplings(Pattern datePattern, DateFormat dateFormat) { |
| pattern = datePattern; |
| formatter = dateFormat; |
| } |
| |
| public PatternCouplings(Pattern datePattern, DateFormat dateFormat, boolean shouldConvertToRFC822) { |
| pattern = datePattern; |
| formatter = dateFormat; |
| needToConvertTimeZone = shouldConvertToRFC822; |
| } |
| |
| public String convertTime(String dateString) { |
| if (dateString.charAt(dateString.length() - 1) == 'Z') { |
| return dateString.replace("Z", "+0000"); |
| } |
| else { |
| // If the time zone wasn't specified with 'Z', then it's in |
| // ISO8601 format (i.e. '(+|-)HH:mm') |
| // RFC822 needs a similar format just without the colon (i.e. |
| // '(+|-)HHmm)'), so remove it |
| return dateString.replaceAll("([\\+\\-]\\d\\d):(\\d\\d)","$1$2"); |
| } |
| } |
| } |
| |
| } |
