javax.security.jacc.URLPatternSpec Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package javax.security.jacc;
import java.util.Arrays;
/**
* This class extends the URLPattern class and is used to represent URLPatternSpec objects. URLPatternSpec objects occur
* within WebResourcePermission and WebUserDataPermission objects.
*
* @author Ron Monzillo
* @author Gary Ellison
*/
class URLPatternSpec extends URLPattern {
private static String EMPTY_STRING = "";
private transient int hashCodeValue;
private String canonicalSpec;
private final String urlPatternList;
private URLPattern[] urlPatternArray;
/**
* Creates a new URLPatternSpec that identifies the web resources to which a WebResourcePermission or
* WebUserDataPermission applies.
*
*
* The syntax of the name parameter is as follows:
*
*
*
* URLPatternList ::= URLPattern | URLPatternList colon URLPattern
*
* URLPatternSpec ::= URLPattern | URLPattern colon URLPatternList
*
* name ::= URLPatternSpec
*
*
* The first URLPattern in a URLPatternSpec may be any of the pattern types, exact, path-prefix, extension, or default
* as defined in the Java Servlet Specification). When a URLPatternSpec includes a URLPatternList, the patterns
* of the URLPatternList identify the resources to which the permission does NOT apply and depend on the pattern type
* and value of the first pattern as follows:
*
*
* - No pattern may exist in the URLPatternList that matches the first pattern.
*
- If the first pattern is a path-prefix pattern, only exact patterns matched by the first pattern and path-prefix
* patterns matched by, but different from, the first pattern may occur in the URLPatternList.
*
- If the first pattern is an extension pattern, only exact patterns that are matched by the first pattern and
* path-prefix patterns may occur in the URLPatternList.
*
- If the first pattern is the default pattern, "/", any pattern except the default pattern may occur in the
* URLPatternList.
*
- If the first pattern is an exact pattern a URLPatternList must not be present in the URLPatternSpec.
*
*
* @param urlPatternSpec a String containing a URLPatternSpec that identifies the application specific web resources to
* which the permission pertains. All URLPatterns in the URLPatternSpec are relative to the context path of the deployed
* web application module, and the same URLPattern must not occur more than once in a URLPatternSpec.
*/
public URLPatternSpec(String urlPatternSpec) {
super(getFirstPattern(urlPatternSpec));
int colon = urlPatternSpec.indexOf(":");
if (colon >= 0) {
urlPatternList = urlPatternSpec.substring(colon + 1);
setURLPatternArray();
} else {
urlPatternList = null;
}
}
/**
* This method returns a String containing the first URLPattern in this URLPatternSpec.
*/
public String getURLPattern() {
return super.toString();
}
/*
* Checks two URLPatternSpec objects for equality. A reference URLPatternSpec is equivalent to an argument
* URLPatternSpec if their first patterns are equivalent, and the patterns of its URLPatternList collectively match
* exactly the same set of patterns as are matched by the patterns of the URLPatternList of the argument URLPatternSpec.
*/
@Override
public boolean equals(Object o) {
if (o == null || !(o instanceof URLPatternSpec)) {
return false;
}
URLPatternSpec that = (URLPatternSpec) o;
return this.toString().equals(that.toString());
}
/**
* Returns the hash code value for this URLPatternSpec properties of the returned hash code must be as follows:
*
*
* - During the lifetime of a Java application, the hashCode method must return the same integer value, every time it
* is called on a URLPatternSpec object. The value returned by hashCode for a particular URlPatternSpec need not remain
* consistent from one execution of an application to another.
*
- If two URLPatternSpec objects are equal according to the equals method, then calling the hashCode method on each
* of the two objects must produce the same integer result (within an application).
*
*
*
* @return the integer hash code value for this object.
*/
@Override
public int hashCode() {
if (hashCodeValue == 0) {
hashCodeValue = this.toString().hashCode();
}
return hashCodeValue;
}
/**
* Determines if the argument URLPatternSpec is "implied by" this URLPatternSpec.
*
*
* For this to be the case, all of the following must be true:
*
* - The argument is an
instanceof URLPatternSpec, and
* - The first Pattern in the argument
URLPatternSpec is matched by the first URLPattern of
* this URLPatternSpec.
* - The first Pattern in the argument
URLPatternSpec is NOT matched by any URLPattern in the
* URLPatternList of this URLPatternSpec.
* - If the first Pattern in the argument
URLPatternSpec matches the first Pattern in this
* URLPatternSpec, then every URLPattern in the URLPatternList of this URLPatternSpec is
* matched by a URLPattern in the URLPatternList of the argument URLPatternSpec.
*
*
* URLPattern matching is performed using the Servlet matching rules where two URL patterns match if they are
* related as follows:
*
* - their pattern values are String equivalent, or
*
- this pattern is the path-prefix pattern "/*", or
*
- this pattern is a path-prefix pattern (that is, it starts with "/" and ends with "/*") and the argument pattern
* starts with the substring of this pattern, minus its last 2 characters, and the next character of the argument
* pattern, if there is one, is "/", or
*
- this pattern is an extension pattern (that is, it starts with "*.") and the argument pattern ends with this
* pattern, or
*
- the reference pattern is the special default pattern, "/", which matches all argument patterns.
*
*
*
* All of the comparisons described above are case sensitive.
*
* @param that "this" URLPatternSpec is checked to see if it implies the argument URLPatternSpec.
* @return true if the specified URLPatternSpec is implied by this URLPatternSpec, false if not.
*/
public boolean implies(URLPatternSpec that) {
if (that == null) {
return false;
}
if (!super.implies(that)) {
return false;
}
for (int i = 0; urlPatternArray != null && i < urlPatternArray.length; i++) {
if (urlPatternArray[i] != null && urlPatternArray[i].implies(that)) {
return false;
}
}
if (urlPatternArray != null && ((URLPattern) that).implies(this)) {
if (that.urlPatternArray == null) {
return false;
}
boolean flags[] = new boolean[urlPatternArray.length];
for (int i = 0; i < flags.length; i++) {
flags[i] = false;
}
int count = 0;
for (int j = 0; j < that.urlPatternArray.length; j++) {
for (int i = 0; i < flags.length; i++) {
if (!flags[i]) {
if (urlPatternArray[i] == null || (that.urlPatternArray[j] != null && that.urlPatternArray[j].implies(urlPatternArray[i]))) {
count += 1;
flags[i] = true;
if (count == flags.length) {
return true;
}
}
}
}
}
return count == flags.length;
}
return true;
}
/*
* This method returns a canonical String representation of the URLPatternSpec. By this time, the patterns have already
* been sorted, and pruned by setURLPatternArray, such that all this method has to do is glue them together into a
* string.
*/
@Override
public String toString() {
if (canonicalSpec == null) {
if (urlPatternList == null) {
canonicalSpec = super.toString();
} else {
StringBuilder specBuilder = null;
for (URLPattern urlPattern : urlPatternArray) {
if (urlPattern != null) {
if (specBuilder == null) {
specBuilder = new StringBuilder(urlPattern.toString());
} else {
specBuilder.append(":" + urlPattern.toString());
}
}
}
if (specBuilder == null) {
canonicalSpec = super.toString();
} else {
canonicalSpec = super.toString() + ":" + specBuilder.toString();
}
}
}
return canonicalSpec;
}
// ----------------- Private Methods ---------------------
private static String getFirstPattern(String urlPatternSpec) {
if (urlPatternSpec == null) {
throw new IllegalArgumentException("Invalid URLPatternSpec");
}
int colon = urlPatternSpec.indexOf(":");
if (colon < 0) {
return urlPatternSpec;
}
if (colon > 0) {
return urlPatternSpec.substring(0, colon);
}
if (colon == 0) {
return EMPTY_STRING;
}
throw new IllegalArgumentException("Invalid URLPatternSpec");
}
private void setURLPatternArray() {
if (urlPatternArray == null && urlPatternList != null) {
String[] tokens = urlPatternList.split(":", -1);
int count = tokens.length;
if (count == 0) {
throw new IllegalArgumentException("colon followed by empty URLPatternList");
}
urlPatternArray = new URLPattern[count];
int firstType = this.patternType();
for (int i = 0; i < count; i++) {
urlPatternArray[i] = new URLPattern(tokens[i]);
if (urlPatternArray[i].implies(this)) {
throw new IllegalArgumentException("pattern in URLPatternList implies first pattern");
}
switch (firstType) {
case URLPattern.PT_PREFIX:
case URLPattern.PT_EXTENSION:
switch (urlPatternArray[i].patternType()) {
case URLPattern.PT_PREFIX:
if (firstType == URLPattern.PT_PREFIX) {
if (super.equals(urlPatternArray[i]) || !super.implies(urlPatternArray[i])) {
throw new IllegalArgumentException("Invalid prefix pattern in URLPatternList");
}
}
break;
case URLPattern.PT_EXACT:
if (!super.implies(urlPatternArray[i])) {
throw new IllegalArgumentException("Invalid exact pattern in URLPatternList");
}
break;
default:
throw new IllegalArgumentException("Invalid pattern type in URLPatternList");
}
case URLPattern.PT_DEFAULT:
if (super.equals(urlPatternArray[i])) {
throw new IllegalArgumentException("Invalid default pattern in URLPatternList");
}
break;
case URLPattern.PT_EXACT:
throw new IllegalArgumentException("invalid URLPatternSpec");
default:
throw new IllegalArgumentException("Invalid pattern type in URLPatternList");
}
}
Arrays.sort(urlPatternArray);
for (int i = 0; i < urlPatternArray.length; i++) {
if (urlPatternArray[i] != null) {
switch (urlPatternArray[i].patternType()) {
case URLPattern.PT_PREFIX:
for (int j = i + 1; j < urlPatternArray.length; j++) {
if (urlPatternArray[i].implies(urlPatternArray[j])) {
urlPatternArray[j] = null;
}
}
break;
default:
break;
}
}
}
}
}
}