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/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
* or jersey/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at jersey/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
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*
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*/
package com.sun.jersey.server.impl.uri;
import java.net.URI;
import java.util.LinkedList;
import java.util.List;
import javax.ws.rs.core.UriBuilder;
/**
*
* @author Jakub Podlesak (japod at sun dot com)
*/
public final class UriHelper {
private static final String removeLeadingSlashesIfNeeded(String path, boolean preserveSlashes) {
if (preserveSlashes) {
return path;
}
// TODO: need some better alg
while (path.startsWith("/")) {
path = path.substring(1);
}
return path;
}
// alg taken from http://gbiv.com/protocols/uri/rfc/rfc3986.html#relative-dot-segments
// the alg works as follows:
// 1. The input buffer is initialized with the now-appended path components and the output buffer is initialized to the empty string.
// 2. While the input buffer is not empty, loop as follows:
// A. If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise,
// B. if the input buffer begins with a prefix of "/./"
// or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise,
// C. if the input buffer begins with a prefix of "/../"
// or "/..", where ".." is a complete path segment,
// then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,
// D. if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,
// E. move the first path segment in the input buffer to the end of the output buffer,
// including the initial "/" character (if any) and any subsequent characters up to, but not including,
// the next "/" character or the end of the input buffer.
// 3. Finally, the output buffer is returned as the result of remove_dot_segments.
public static String removeDotSegments(String path, boolean preserveContdSlashes) {
if (null == path) {
return null;
}
List outputSegments = new LinkedList();
while (path.length() > 0) {
if (path.startsWith("../")) { // rule 2A
path = removeLeadingSlashesIfNeeded(path.substring(3), preserveContdSlashes);
} else if (path.startsWith("./")) { // rule 2A
path = removeLeadingSlashesIfNeeded(path.substring(2), preserveContdSlashes);
} else if (path.startsWith("/./")) { // rule 2B
path = "/" + removeLeadingSlashesIfNeeded(path.substring(3), preserveContdSlashes);
} else if ("/.".equals(path)) { // rule 2B
path = "/";
} else if (path.startsWith("/../")) { // rule 2C
path = "/" + removeLeadingSlashesIfNeeded(path.substring(4), preserveContdSlashes);
if(!outputSegments.isEmpty()) { // removing last segment if any
outputSegments.remove(outputSegments.size() - 1);
}
} else if ("/..".equals(path)) { // rule 2C
path = "/";
if(!outputSegments.isEmpty()) { // removing last segment if any
outputSegments.remove(outputSegments.size() - 1);
}
} else if ("..".equals(path) || ".".equals(path)) { // rule 2D
path = "";
} else { // rule E
int slashStartSearchIndex;
if (path.startsWith("/")) {
path = "/" + removeLeadingSlashesIfNeeded(path.substring(1), preserveContdSlashes);
slashStartSearchIndex = 1;
} else {
slashStartSearchIndex = 0;
}
int segLength = path.indexOf('/', slashStartSearchIndex);
if (-1 == segLength) {
segLength = path.length();
}
outputSegments.add(path.substring(0, segLength));
path = path.substring(segLength);
}
}
StringBuffer result = new StringBuffer();
for (String segment : outputSegments) {
result.append(segment);
}
return result.toString();
}
public static URI normalize(URI u, boolean preserveContdSlashes) {
if (!u.getRawPath().contains("//")) {
return u.normalize();
}
String np = removeDotSegments(u.getRawPath(), preserveContdSlashes);
if (np.equals(u.getRawPath())) {
return u;
}
UriBuilder ub = UriBuilder.fromUri(u);
return ub.replacePath(np).build();
}
}
