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Apache XML Security for Java supports XML-Signature Syntax and Processing,
W3C Recommendation 12 February 2002, and XML Encryption Syntax and
Processing, W3C Recommendation 10 December 2002. As of version 1.4,
the library supports the standard Java API JSR-105: XML Digital Signature APIs.
/**
* 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.xml.security.c14n.implementations;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.w3c.dom.Attr;
/**
* An XmlAttrStack that is shared between the Canonical XML 1.0 and 1.1 implementations.
*/
class XmlAttrStack {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(XmlAttrStack.class);
private static class XmlsStackElement {
int level;
boolean rendered = false;
final List nodes = new ArrayList<>();
}
private int currentLevel = 0;
private int lastlevel = 0;
private XmlsStackElement cur;
private final List levels = new ArrayList<>();
private final boolean c14n11;
public XmlAttrStack(boolean c14n11) {
this.c14n11 = c14n11;
}
void push(int level) {
currentLevel = level;
if (currentLevel == -1) {
return;
}
cur = null;
while (lastlevel >= currentLevel) {
levels.remove(levels.size() - 1);
int newSize = levels.size();
if (newSize == 0) {
lastlevel = 0;
return;
}
lastlevel = levels.get(newSize - 1).level;
}
}
void addXmlnsAttr(Attr n) {
if (cur == null) {
cur = new XmlsStackElement();
cur.level = currentLevel;
levels.add(cur);
lastlevel = currentLevel;
}
cur.nodes.add(n);
}
void getXmlnsAttr(Collection col) {
int size = levels.size() - 1;
if (cur == null) {
cur = new XmlsStackElement();
cur.level = currentLevel;
lastlevel = currentLevel;
levels.add(cur);
}
boolean parentRendered = false;
XmlsStackElement e = null;
if (size == -1) {
parentRendered = true;
} else {
e = levels.get(size);
if (e.rendered && e.level + 1 == currentLevel) {
parentRendered = true;
}
}
if (parentRendered) {
col.addAll(cur.nodes);
cur.rendered = true;
return;
}
Map loa = new HashMap<>();
if (c14n11) {
List baseAttrs = new ArrayList<>();
boolean successiveOmitted = true;
for (; size >= 0; size--) {
e = levels.get(size);
if (e.rendered) {
successiveOmitted = false;
}
Iterator it = e.nodes.iterator();
while (it.hasNext() && successiveOmitted) {
Attr n = it.next();
if ("base".equals(n.getLocalName()) && !e.rendered) {
baseAttrs.add(n);
} else if (!loa.containsKey(n.getName())) {
loa.put(n.getName(), n);
}
}
}
if (!baseAttrs.isEmpty()) {
String base = null;
Attr baseAttr = null;
for (Attr n : col) {
if ("base".equals(n.getLocalName())) {
base = n.getValue();
baseAttr = n;
break;
}
}
for (Attr n : baseAttrs) {
if (base == null) {
base = n.getValue();
baseAttr = n;
} else {
try {
base = joinURI(n.getValue(), base);
} catch (URISyntaxException ue) {
LOG.debug(ue.getMessage(), ue);
}
}
}
if (base != null && base.length() != 0) {
baseAttr.setValue(base);
col.add(baseAttr);
}
}
} else {
for (; size >= 0; size--) {
e = levels.get(size);
for (Attr n : e.nodes) {
if (!loa.containsKey(n.getName())) {
loa.put(n.getName(), n);
}
}
}
}
cur.rendered = true;
col.addAll(loa.values());
}
private static String joinURI(String baseURI, String relativeURI) throws URISyntaxException {
String bscheme = null;
String bauthority = null;
String bpath = "";
String bquery = null;
// pre-parse the baseURI
if (baseURI != null) {
if (baseURI.endsWith("..")) {
baseURI = baseURI + "/";
}
URI base = new URI(baseURI);
bscheme = base.getScheme();
bauthority = base.getAuthority();
bpath = base.getPath();
bquery = base.getQuery();
}
URI r = new URI(relativeURI);
String rscheme = r.getScheme();
String rauthority = r.getAuthority();
String rpath = r.getPath();
String rquery = r.getQuery();
String tscheme, tauthority, tpath, tquery;
if (rscheme != null && rscheme.equals(bscheme)) {
rscheme = null;
}
if (rscheme != null) {
tscheme = rscheme;
tauthority = rauthority;
tpath = removeDotSegments(rpath);
tquery = rquery;
} else {
if (rauthority != null) {
tauthority = rauthority;
tpath = removeDotSegments(rpath);
tquery = rquery;
} else {
if (rpath.length() == 0) {
tpath = bpath;
if (rquery != null) {
tquery = rquery;
} else {
tquery = bquery;
}
} else {
if (rpath.charAt(0) == '/') {
tpath = removeDotSegments(rpath);
} else {
if (bauthority != null && bpath.length() == 0) {
tpath = "/" + rpath;
} else {
int last = bpath.lastIndexOf('/');
if (last == -1) {
tpath = rpath;
} else {
tpath = bpath.substring(0, last+1) + rpath;
}
}
tpath = removeDotSegments(tpath);
}
tquery = rquery;
}
tauthority = bauthority;
}
tscheme = bscheme;
}
return new URI(tscheme, tauthority, tpath, tquery, null).toString();
}
private static String removeDotSegments(String path) {
LOG.debug("STEP OUTPUT BUFFER\t\tINPUT BUFFER");
// 1. The input buffer is initialized with the now-appended path
// components then replace occurrences of "//" in the input buffer
// with "/" until no more occurrences of "//" are in the input buffer.
String input = path;
while (input.indexOf("//") > -1) {
input = input.replaceAll("//", "/");
}
// Initialize the output buffer with the empty string.
StringBuilder output = new StringBuilder();
// If the input buffer starts with a root slash "/" then move this
// character to the output buffer.
if (input.charAt(0) == '/') {
output.append('/');
input = input.substring(1);
}
printStep("1 ", output.toString(), input);
// While the input buffer is not empty, loop as follows
while (input.length() != 0) {
// 2A. If the input buffer begins with a prefix of "./",
// then remove that prefix from the input buffer
// else if the input buffer begins with a prefix of "../", then
// if also the output does not contain the root slash "/" only,
// then move this prefix to the end of the output buffer else
// remove that prefix
if (input.startsWith("./")) {
input = input.substring(2);
printStep("2A", output.toString(), input);
} else if (input.startsWith("../")) {
input = input.substring(3);
if (!"/".equals(output.toString())) {
output.append("../");
}
printStep("2A", output.toString(), input);
// 2B. 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,
} else if (input.startsWith("/./")) {
input = input.substring(2);
printStep("2B", output.toString(), input);
} else if ("/.".equals(input)) {
// FIXME: what is complete path segment?
input = input.replaceFirst("/.", "/");
printStep("2B", output.toString(), input);
// 2C. 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 if also the output buffer is
// empty, last segment in the output buffer equals "../" or "..",
// where ".." is a complete path segment, then append ".." or "/.."
// for the latter case respectively to the output buffer else
// remove the last segment and its preceding "/" (if any) from the
// output buffer and if hereby the first character in the output
// buffer was removed and it was not the root slash then delete a
// leading slash from the input buffer; otherwise,
} else if (input.startsWith("/../")) {
input = input.substring(3);
if (output.length() == 0) {
output.append('/');
} else if (output.toString().endsWith("../")) {
output.append("..");
} else if (output.toString().endsWith("..")) {
output.append("/..");
} else {
int index = output.lastIndexOf("/");
if (index == -1) {
output = new StringBuilder();
if (input.charAt(0) == '/') {
input = input.substring(1);
}
} else {
output = output.delete(index, output.length());
}
}
printStep("2C", output.toString(), input);
} else if ("/..".equals(input)) {
// FIXME: what is complete path segment?
input = input.replaceFirst("/..", "/");
if (output.length() == 0) {
output.append('/');
} else if (output.toString().endsWith("../")) {
output.append("..");
} else if (output.toString().endsWith("..")) {
output.append("/..");
} else {
int index = output.lastIndexOf("/");
if (index == -1) {
output = new StringBuilder();
if (input.charAt(0) == '/') {
input = input.substring(1);
}
} else {
output = output.delete(index, output.length());
}
}
printStep("2C", output.toString(), input);
// 2D. if the input buffer consists only of ".", then remove
// that from the input buffer else if the input buffer consists
// only of ".." and if the output buffer does not contain only
// the root slash "/", then move the ".." to the output buffer
// else delete it.; otherwise,
} else if (".".equals(input)) {
input = "";
printStep("2D", output.toString(), input);
} else if ("..".equals(input)) {
if (!"/".equals(output.toString())) {
output.append("..");
}
input = "";
printStep("2D", output.toString(), input);
// 2E. move the first path segment (if any) 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.
} else {
int end = -1;
int begin = input.indexOf('/');
if (begin == 0) {
end = input.indexOf('/', 1);
} else {
end = begin;
begin = 0;
}
String segment;
if (end == -1) {
segment = input.substring(begin);
input = "";
} else {
segment = input.substring(begin, end);
input = input.substring(end);
}
output.append(segment);
printStep("2E", output.toString(), input);
}
}
// 3. Finally, if the only or last segment of the output buffer is
// "..", where ".." is a complete path segment not followed by a slash
// then append a slash "/". The output buffer is returned as the result
// of remove_dot_segments
if (output.toString().endsWith("..")) {
output.append('/');
printStep("3 ", output.toString(), input);
}
return output.toString();
}
private static void printStep(String step, String output, String input) {
if (LOG.isDebugEnabled()) {
LOG.debug(" " + step + ": " + output);
if (output.length() == 0) {
LOG.debug("\t\t\t\t" + input);
} else {
LOG.debug("\t\t\t" + input);
}
}
}
}
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