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/*
* JBoss, Home of Professional Open Source.
* Copyright 2013, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* Licensed 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.jboss.vfs;
import java.io.Serializable;
import java.security.Permission;
import java.security.PermissionCollection;
/**
* A permission to a file on the virtual file system.
*
* @author David M. Lloyd
* @see java.io.FilePermission
*/
public final class VirtualFilePermission extends Permission implements Serializable {
private static final long serialVersionUID = 1L;
/**
* @serial the action flags (must be within {@link #VALID_FLAGS})
*/
private final int actionFlags;
/**
* The flag value for the "read" action.
*/
public static final int FLAG_READ = Integer.parseInt("0000000000000001",2); //0b0000_0000_0000_0001
/**
* The flag value for the "delete" action.
*/
public static final int FLAG_DELETE = Integer.parseInt("0000000000000010",2); //0b0000_0000_0000_0010;
/**
* The flag value for the "getfile" action.
*/
public static final int FLAG_GET_FILE = Integer.parseInt("0000000000000100",2); //0b0000_0000_0000_0100;
/**
* The set of valid action flags for this permission.
*/
public static final int VALID_FLAGS = Integer.parseInt("0000000000000111",2); //0b0000_0000_0000_0111;
VirtualFilePermission(final String path, final int actionFlags, final boolean canonicalize) {
super(canonicalize ? VFSUtils.canonicalize(path) : path);
this.actionFlags = actionFlags & VALID_FLAGS;
}
/**
* Construct a new instance.
*
* @param path the path
* @param actions the actions to grant
*/
public VirtualFilePermission(final String path, final String actions) {
this(path, parseActions(actions), true);
}
/**
* Construct a new instance. Any flags outside of {@link #VALID_FLAGS} are ignored.
*
* @param path the path
* @param actionFlags the action flags to set
*/
public VirtualFilePermission(final String path, final int actionFlags) {
this(path, actionFlags, true);
}
private static boolean in(char c, char t1, char t2) {
return c == t1 || c == t2;
}
private static boolean lenIs(String s, int idx, int len, int wlen) {
return idx == len - wlen || idx < len - wlen && s.charAt(idx + wlen) == ',';
}
static int parseActions(String actions) {
final int len = actions.length();
int res = 0;
for (int i = 0; i < len; i++) {
if (lenIs(actions, i, len, 4)
&& in(actions.charAt(i), 'r', 'R')
&& in(actions.charAt(i + 1), 'e', 'E')
&& in(actions.charAt(i + 2), 'a', 'A')
&& in(actions.charAt(i + 3), 'd', 'D')) {
res |= FLAG_READ;
i += 4;
} else if (lenIs(actions, i, len, 6)
&& in(actions.charAt(i), 'd', 'D')
&& in(actions.charAt(i + 1), 'e', 'E')
&& in(actions.charAt(i + 2), 'l', 'L')
&& in(actions.charAt(i + 3), 'e', 'E')
&& in(actions.charAt(i + 4), 't', 'T')
&& in(actions.charAt(i + 5), 'e', 'E')) {
res |= FLAG_DELETE;
i += 6;
} else if (lenIs(actions, i, len, 7)
&& in(actions.charAt(i), 'g', 'G')
&& in(actions.charAt(i + 1), 'e', 'E')
&& in(actions.charAt(i + 2), 't', 'T')
&& in(actions.charAt(i + 3), 'f', 'F')
&& in(actions.charAt(i + 4), 'i', 'I')
&& in(actions.charAt(i + 5), 'l', 'L')
&& in(actions.charAt(i + 6), 'e', 'E')) {
res |= FLAG_GET_FILE;
i += 7;
} else if (lenIs(actions, i, len, 1) && actions.charAt(i) == '*') {
res |= FLAG_READ | FLAG_DELETE | FLAG_GET_FILE;
} else {
throw VFSMessages.MESSAGES.invalidActionsString(actions);
}
}
return res;
}
public boolean implies(final Permission permission) {
return permission instanceof VirtualFilePermission && implies((VirtualFilePermission) permission);
}
public boolean implies(final VirtualFilePermission permission) {
return permission != null && impliesUnchecked(permission);
}
private boolean impliesUnchecked(final VirtualFilePermission permission) {
final int theirFlags = permission.actionFlags;
return (actionFlags & theirFlags) == theirFlags && impliesPath(getName(), permission.getName());
}
private static int ourIndexOf(String str, char ch, int start) {
final int idx = str.indexOf(ch, start);
return idx == -1 ? str.length() : idx;
}
static boolean impliesPath(String ourName, String theirName) {
if ("<>".equals(ourName)) {
return true;
}
return impliesPath(ourName, theirName, 0);
}
private static boolean impliesPath(String ourName, String theirName, int idx) {
final int ourLen = ourName.length();
final int theirLen = theirName.length();
final int ei1 = ourIndexOf(ourName, '/', idx);
final int ei2 = ourIndexOf(theirName, '/', idx);
if (ei1 == idx + 1) {
final char ch = ourName.charAt(idx);
if (ch == '-') {
// recursive wildcard...
// if they are non-empty, match
return theirLen > idx; // otherwise their segment is empty (no match)
} else if (ch == '*') {
// non-recursive wildcard...
// if they are non-empty, and this is their last segment, match, unless they are '-'
return theirLen > idx && ei2 == theirLen && (ei2 != ei1 || theirName.charAt(idx) != '-');
}
}
if (ei1 == ei2) {
if (ei1 == ourLen && ei2 == theirLen) {
// exact match
return true;
} else {
// leading sequence matches, check next segment
return impliesPath(ourName, theirName, ei1 + 1);
}
} else {
return false;
}
}
public String getActions() {
final StringBuilder builder = new StringBuilder();
if ((actionFlags & FLAG_READ) != 0) {
builder.append("read");
}
if ((actionFlags & FLAG_DELETE) != 0) {
if (builder.length() > 0) { builder.append(','); }
builder.append("delete");
}
if ((actionFlags & FLAG_GET_FILE) != 0) {
if (builder.length() > 0) { builder.append(','); }
builder.append("getfile");
}
return builder.toString();
}
/**
* Get the action flags for this permission.
*
* @return the action flags for this permission
*/
public int getActionFlags() {
return actionFlags;
}
public PermissionCollection newPermissionCollection() {
return new VirtualFilePermissionCollection();
}
public boolean equals(final Object permission) {
return permission instanceof VirtualFilePermission && equals((VirtualFilePermission) permission);
}
public boolean equals(final Permission permission) {
return permission instanceof VirtualFilePermission && equals((VirtualFilePermission) permission);
}
public boolean equals(final VirtualFilePermission permission) {
return permission != null && permission.actionFlags == actionFlags && permission.getName().equals(permission.getName());
}
public int hashCode() {
return getName().hashCode() * 11 + actionFlags;
}
}
