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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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
*
* 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.apache.activemq.util;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Utility class that provides methods for parsing URI's
*
* This class can be used to split composite URI's into their component parts and is used to extract any
* URI options from each URI in order to set specific properties on Beans.
*/
public class URISupport {
/**
* A composite URI can be split into one or more CompositeData object which each represent the
* individual URIs that comprise the composite one.
*/
public static class CompositeData {
private String host;
private String scheme;
private String path;
private URI components[];
private Map parameters;
private String fragment;
public URI[] getComponents() {
return components;
}
public String getFragment() {
return fragment;
}
public Map getParameters() {
return parameters;
}
public String getScheme() {
return scheme;
}
public String getPath() {
return path;
}
public String getHost() {
return host;
}
public URI toURI() throws URISyntaxException {
StringBuffer sb = new StringBuffer();
if (scheme != null) {
sb.append(scheme);
sb.append(':');
}
if (host != null && host.length() != 0) {
sb.append(host);
} else {
sb.append('(');
for (int i = 0; i < components.length; i++) {
if (i != 0) {
sb.append(',');
}
sb.append(components[i].toString());
}
sb.append(')');
}
if (path != null) {
sb.append('/');
sb.append(path);
}
if (!parameters.isEmpty()) {
sb.append("?");
sb.append(createQueryString(parameters));
}
if (fragment != null) {
sb.append("#");
sb.append(fragment);
}
return new URI(sb.toString());
}
}
/**
* Give a URI break off any URI options and store them in a Key / Value Mapping.
*
* @param uri
* The URI whose query should be extracted and processed.
*
* @return A Mapping of the URI options.
* @throws URISyntaxException
*/
public static Map parseQuery(String uri) throws URISyntaxException {
try {
uri = uri.substring(uri.lastIndexOf("?") + 1); // get only the relevant part of the query
Map rc = new HashMap();
if (uri != null && !uri.isEmpty()) {
String[] parameters = uri.split("&");
for (int i = 0; i < parameters.length; i++) {
int p = parameters[i].indexOf("=");
if (p >= 0) {
String name = URLDecoder.decode(parameters[i].substring(0, p), "UTF-8");
String value = URLDecoder.decode(parameters[i].substring(p + 1), "UTF-8");
rc.put(name, value);
} else {
rc.put(parameters[i], null);
}
}
}
return rc;
} catch (UnsupportedEncodingException e) {
throw (URISyntaxException)new URISyntaxException(e.toString(), "Invalid encoding").initCause(e);
}
}
/**
* Given a URI parse and extract any URI query options and return them as a Key / Value mapping.
*
* This method differs from the {@link parseQuery} method in that it handles composite URI types and
* will extract the URI options from the outermost composite URI.
*
* @param uri
* The URI whose query should be extracted and processed.
*
* @return A Mapping of the URI options.
* @throws URISyntaxException
*/
public static Map parseParameters(URI uri) throws URISyntaxException {
if (!isCompositeURI(uri)) {
return uri.getQuery() == null ? emptyMap() : parseQuery(stripPrefix(uri.getQuery(), "?"));
} else {
CompositeData data = URISupport.parseComposite(uri);
Map parameters = new HashMap();
parameters.putAll(data.getParameters());
if (parameters.isEmpty()) {
parameters = emptyMap();
}
return parameters;
}
}
/**
* Given a Key / Value mapping create and append a URI query value that represents the mapped entries, return the
* newly updated URI that contains the value of the given URI and the appended query value.
*
* @param uri
* The source URI that will have the Map entries appended as a URI query value.
* @param queryParameters
* The Key / Value mapping that will be transformed into a URI query string.
*
* @return A new URI value that combines the given URI and the constructed query string.
* @throws URISyntaxException
*/
public static URI applyParameters(URI uri, Map queryParameters) throws URISyntaxException {
return applyParameters(uri, queryParameters, "");
}
/**
* Given a Key / Value mapping create and append a URI query value that represents the mapped entries, return the
* newly updated URI that contains the value of the given URI and the appended query value. Each entry in the query
* string is prefixed by the supplied optionPrefix string.
*
* @param uri
* The source URI that will have the Map entries appended as a URI query value.
* @param queryParameters
* The Key / Value mapping that will be transformed into a URI query string.
* @param optionPrefix
* A string value that when not null or empty is used to prefix each query option key.
*
* @return A new URI value that combines the given URI and the constructed query string.
* @throws URISyntaxException
*/
public static URI applyParameters(URI uri, Map queryParameters, String optionPrefix) throws URISyntaxException {
if (queryParameters != null && !queryParameters.isEmpty()) {
StringBuffer newQuery = uri.getRawQuery() != null ? new StringBuffer(uri.getRawQuery()) : new StringBuffer() ;
for ( Map.Entry param: queryParameters.entrySet()) {
if (param.getKey().startsWith(optionPrefix)) {
if (newQuery.length()!=0) {
newQuery.append('&');
}
final String key = param.getKey().substring(optionPrefix.length());
newQuery.append(key).append('=').append(param.getValue());
}
}
uri = createURIWithQuery(uri, newQuery.toString());
}
return uri;
}
@SuppressWarnings("unchecked")
private static Map emptyMap() {
return Collections.EMPTY_MAP;
}
/**
* Removes any URI query from the given uri and return a new URI that does not contain the query portion.
*
* @param uri
* The URI whose query value is to be removed.
*
* @return a new URI that does not contain a query value.
* @throws URISyntaxException
*/
public static URI removeQuery(URI uri) throws URISyntaxException {
return createURIWithQuery(uri, null);
}
/**
* Creates a URI with the given query, removing an previous query value from the given URI.
*
* @param uri
* The source URI whose existing query is replaced with the newly supplied one.
* @param query
* The new URI query string that should be appended to the given URI.
*
* @return a new URI that is a combination of the original URI and the given query string.
* @throws URISyntaxException
*/
public static URI createURIWithQuery(URI uri, String query) throws URISyntaxException {
String schemeSpecificPart = uri.getRawSchemeSpecificPart();
// strip existing query if any
int questionMark = schemeSpecificPart.lastIndexOf("?");
// make sure question mark is not within parentheses
if (questionMark < schemeSpecificPart.lastIndexOf(")")) {
questionMark = -1;
}
if (questionMark > 0) {
schemeSpecificPart = schemeSpecificPart.substring(0, questionMark);
}
if (query != null && query.length() > 0) {
schemeSpecificPart += "?" + query;
}
return new URI(uri.getScheme(), schemeSpecificPart, uri.getFragment());
}
/**
* Given a composite URI, parse the individual URI elements contained within that URI and return
* a CompsoteData instance that contains the parsed URI values.
*
* @param uri
* The target URI that should be parsed.
*
* @return a new CompsiteData instance representing the parsed composite URI.
* @throws URISyntaxException
*/
public static CompositeData parseComposite(URI uri) throws URISyntaxException {
CompositeData rc = new CompositeData();
rc.scheme = uri.getScheme();
String ssp = stripPrefix(uri.getRawSchemeSpecificPart().trim(), "//").trim();
parseComposite(uri, rc, ssp);
rc.fragment = uri.getFragment();
return rc;
}
/**
* Examine a URI and determine if it is a Composite type or not.
*
* @param uri
* The URI that is to be examined.
*
* @return true if the given URI is a Compsote type.
*/
public static boolean isCompositeURI(URI uri) {
String ssp = stripPrefix(uri.getRawSchemeSpecificPart().trim(), "//").trim();
if (ssp.indexOf('(') == 0 && checkParenthesis(ssp)) {
return true;
}
return false;
}
/**
* Given a string and a position in that string of an open parend, find the matching close parend.
*
* @param str
* The string to be searched for a matching parend.
* @param first
* The index in the string of the opening parend whose close value is to be searched.
*
* @return the index in the string where the closing parend is located.
* @throws URISyntaxException fi the string does not contain a matching parend.
*/
public static int indexOfParenthesisMatch(String str, int first) throws URISyntaxException {
int index = -1;
if (first < 0 || first > str.length()) {
throw new IllegalArgumentException("Invalid position for first parenthesis: " + first);
}
if (str.charAt(first) != '(') {
throw new IllegalArgumentException("character at indicated position is not a parenthesis");
}
int depth = 1;
char[] array = str.toCharArray();
for (index = first + 1; index < array.length; ++index) {
char current = array[index];
if (current == '(') {
depth++;
} else if (current == ')') {
if (--depth == 0) {
break;
}
}
}
if (depth != 0) {
throw new URISyntaxException(str, "URI did not contain a matching parenthesis.");
}
return index;
}
/**
* Given a composite URI and a CompositeData instance and the scheme specific part extracted from the source URI,
* parse the composite URI and populate the CompositeData object with the results. The source URI is used only
* for logging as the ssp should have already been extracted from it and passed here.
*
* @param uri
* The original source URI whose ssp is parsed into the composite data.
* @param rc
* The CompsositeData instance that will be populated from the given ssp.
* @param ssp
* The scheme specific part from the original string that is a composite or one or more URIs.
*
* @throws URISyntaxException
*/
private static void parseComposite(URI uri, CompositeData rc, String ssp) throws URISyntaxException {
String componentString;
String params;
if (!checkParenthesis(ssp)) {
throw new URISyntaxException(uri.toString(), "Not a matching number of '(' and ')' parenthesis");
}
int p;
int initialParen = ssp.indexOf("(");
if (initialParen == 0) {
rc.host = ssp.substring(0, initialParen);
p = rc.host.indexOf("/");
if (p >= 0) {
rc.path = rc.host.substring(p);
rc.host = rc.host.substring(0, p);
}
p = indexOfParenthesisMatch(ssp, initialParen);
componentString = ssp.substring(initialParen + 1, p);
params = ssp.substring(p + 1).trim();
} else {
componentString = ssp;
params = "";
}
String components[] = splitComponents(componentString);
rc.components = new URI[components.length];
for (int i = 0; i < components.length; i++) {
rc.components[i] = new URI(components[i].trim());
}
p = params.indexOf("?");
if (p >= 0) {
if (p > 0) {
rc.path = stripPrefix(params.substring(0, p), "/");
}
rc.parameters = parseQuery(params.substring(p + 1));
} else {
if (params.length() > 0) {
rc.path = stripPrefix(params, "/");
}
rc.parameters = emptyMap();
}
}
/**
* Given the inner portion of a composite URI, split and return each inner URI as a string
* element in a new String array.
*
* @param str
* The inner URI elements of a composite URI string.
*
* @return an array containing each inner URI from the composite one.
*/
private static String[] splitComponents(String str) {
List l = new ArrayList();
int last = 0;
int depth = 0;
char chars[] = str.toCharArray();
for (int i = 0; i < chars.length; i++) {
switch (chars[i]) {
case '(':
depth++;
break;
case ')':
depth--;
break;
case ',':
if (depth == 0) {
String s = str.substring(last, i);
l.add(s);
last = i + 1;
}
break;
default:
}
}
String s = str.substring(last);
if (s.length() != 0) {
l.add(s);
}
String rc[] = new String[l.size()];
l.toArray(rc);
return rc;
}
/**
* String the given prefix from the target string and return the result.
*
* @param value
* The string that should be trimmed of the given prefix if present.
* @param prefix
* The prefix to remove from the target string.
*
* @return either the original string or a new string minus the supplied prefix if present.
*/
public static String stripPrefix(String value, String prefix) {
if (value.startsWith(prefix)) {
return value.substring(prefix.length());
}
return value;
}
/**
* Strip a URI of its scheme element.
*
* @param uri
* The URI whose scheme value should be stripped.
*
* @return The stripped URI value.
* @throws URISyntaxException
*/
public static URI stripScheme(URI uri) throws URISyntaxException {
return new URI(stripPrefix(uri.getSchemeSpecificPart().trim(), "//"));
}
/**
* Given a key / value mapping, create and return a URI formatted query string that is valid and
* can be appended to a URI.
*
* @param options
* The Mapping that will create the new Query string.
*
* @return a URI formatted query string.
* @throws URISyntaxException
*/
public static String createQueryString(Map options) throws URISyntaxException {
try {
if (options.size() > 0) {
StringBuffer rc = new StringBuffer();
boolean first = true;
for (String key : options.keySet()) {
if (first) {
first = false;
} else {
rc.append("&");
}
String value = (String)options.get(key);
rc.append(URLEncoder.encode(key, "UTF-8"));
rc.append("=");
rc.append(URLEncoder.encode(value, "UTF-8"));
}
return rc.toString();
} else {
return "";
}
} catch (UnsupportedEncodingException e) {
throw (URISyntaxException)new URISyntaxException(e.toString(), "Invalid encoding").initCause(e);
}
}
/**
* Creates a URI from the original URI and the remaining parameters.
*
* When the query options of a URI are applied to certain objects the used portion of the query options needs
* to be removed and replaced with those that remain so that other parts of the code can attempt to apply the
* remainder or give an error is unknown values were given. This method is used to update a URI with those
* remainder values.
*
* @param originalURI
* The URI whose current parameters are remove and replaced with the given remainder value.
* @param params
* The URI params that should be used to replace the current ones in the target.
*
* @return a new URI that matches the original one but has its query options replaced with the given ones.
* @throws URISyntaxException
*/
public static URI createRemainingURI(URI originalURI, Map params) throws URISyntaxException {
String s = createQueryString(params);
if (s.length() == 0) {
s = null;
}
return createURIWithQuery(originalURI, s);
}
/**
* Given a URI value create and return a new URI that matches the target one but with the scheme value
* supplied to this method.
*
* @param bindAddr
* The URI whose scheme value should be altered.
* @param scheme
* The new scheme value to use for the returned URI.
*
* @return a new URI that is a copy of the original except that its scheme matches the supplied one.
* @throws URISyntaxException
*/
public static URI changeScheme(URI bindAddr, String scheme) throws URISyntaxException {
return new URI(scheme, bindAddr.getUserInfo(), bindAddr.getHost(), bindAddr.getPort(), bindAddr
.getPath(), bindAddr.getQuery(), bindAddr.getFragment());
}
/**
* Examine the supplied string and ensure that all parends appear as matching pairs.
*
* @param str
* The target string to examine.
*
* @return true if the target string has valid parend pairings.
*/
public static boolean checkParenthesis(String str) {
boolean result = true;
if (str != null) {
int open = 0;
int closed = 0;
int i = 0;
while ((i = str.indexOf('(', i)) >= 0) {
i++;
open++;
}
i = 0;
while ((i = str.indexOf(')', i)) >= 0) {
i++;
closed++;
}
result = open == closed;
}
return result;
}
}
