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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.tomcat.util.buf;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Pattern;
/**
* Utility class for working with URIs and URLs.
*/
public final class UriUtil {
private static Pattern PATTERN_EXCLAMATION_MARK = Pattern.compile("!/");
private static Pattern PATTERN_CARET = Pattern.compile("\\^/");
private static Pattern PATTERN_ASTERISK = Pattern.compile("\\*/");
private UriUtil() {
// Utility class. Hide default constructor
}
/**
* Determine if the character is allowed in the scheme of a URI.
* See RFC 2396, Section 3.1
*
* @param c The character to test
*
* @return {@code true} if a the character is allowed, otherwise {code
* @false}
*/
private static boolean isSchemeChar(char c) {
return Character.isLetterOrDigit(c) || c == '+' || c == '-' || c == '.';
}
/**
* Determine if a URI string has a <code>scheme</code> component.
*
* @param uri The URI to test
*
* @return {@code true} if a scheme is present, otherwise {code @false}
*/
public static boolean hasScheme(CharSequence uri) {
int len = uri.length();
for(int i=0; i < len ; i++) {
char c = uri.charAt(i);
if(c == ':') {
return i > 0;
} else if(!UriUtil.isSchemeChar(c)) {
return false;
}
}
return false;
}
public static URL buildJarUrl(File jarFile) throws MalformedURLException {
return buildJarUrl(jarFile, null);
}
public static URL buildJarUrl(File jarFile, String entryPath) throws MalformedURLException {
return buildJarUrl(jarFile.toURI().toString(), entryPath);
}
public static URL buildJarUrl(String fileUrlString) throws MalformedURLException {
return buildJarUrl(fileUrlString, null);
}
public static URL buildJarUrl(String fileUrlString, String entryPath) throws MalformedURLException {
String safeString = makeSafeForJarUrl(fileUrlString);
StringBuilder sb = new StringBuilder();
sb.append("jar:");
sb.append(safeString);
sb.append("!/");
if (entryPath != null) {
sb.append(makeSafeForJarUrl(entryPath));
}
return new URL(sb.toString());
}
public static URL buildJarSafeUrl(File file) throws MalformedURLException {
String safe = makeSafeForJarUrl(file.toURI().toString());
return new URL(safe);
}
/*
* When testing on markt's desktop each iteration was taking ~1420ns when
* using String.replaceAll().
*
* Switching the implementation to use pre-compiled patterns and
* Pattern.matcher(input).replaceAll(replacement) reduced this by ~10%.
*
* Note: Given the very small absolute time of a single iteration, even for
* a web application with 1000 JARs this is only going to add ~3ms.
* It is therefore unlikely that further optimisation will be
* necessary.
*/
/*
* Pulled out into a separate method in case we need to handle other unusual
* sequences in the future.
*/
private static String makeSafeForJarUrl(String input) {
// Since "!/" has a special meaning in a JAR URL, make sure that the
// sequence is properly escaped if present.
String tmp = PATTERN_EXCLAMATION_MARK.matcher(input).replaceAll("%21/");
// Tomcat's custom jar:war: URL handling treats */ and ^/ as special
tmp = PATTERN_CARET.matcher(tmp).replaceAll("%5e/");
return PATTERN_ASTERISK.matcher(tmp).replaceAll("%2a/");
}
}
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