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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.attribute.*;
import java.io.IOException;
import static sun.nio.fs.UnixNativeDispatcher.*;
/**
* Unix implementation of java.nio.file.attribute.UserPrincipal
*/
class UnixUserPrincipals {
private static User createSpecial(String name) { return new User(-1, name); }
static final User SPECIAL_OWNER = createSpecial("OWNER@");
static final User SPECIAL_GROUP = createSpecial("GROUP@");
static final User SPECIAL_EVERYONE = createSpecial("EVERYONE@");
static class User implements UserPrincipal {
private final int id; // uid or gid
private final boolean isGroup;
private final String name;
private User(int id, boolean isGroup, String name) {
this.id = id;
this.isGroup = isGroup;
this.name = name;
}
User(int id, String name) {
this(id, false, name);
}
int uid() {
if (isGroup)
throw new AssertionError();
return id;
}
int gid() {
if (isGroup)
return id;
throw new AssertionError();
}
boolean isSpecial() {
return id == -1;
}
@Override
public String getName() {
return name;
}
@Override
public String toString() {
return name;
}
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
if (!(obj instanceof User))
return false;
User other = (User)obj;
if ((this.id != other.id) ||
(this.isGroup != other.isGroup)) {
return false;
}
// specials
if (this.id == -1 && other.id == -1)
return this.name.equals(other.name);
return true;
}
@Override
public int hashCode() {
return (id != -1) ? id : name.hashCode();
}
}
static class Group extends User implements GroupPrincipal {
Group(int id, String name) {
super(id, true, name);
}
}
// return UserPrincipal representing given uid
static User fromUid(int uid) {
String name = null;
try {
name = Util.toString(getpwuid(uid));
} catch (UnixException x) {
name = Integer.toString(uid);
}
return new User(uid, name);
}
// return GroupPrincipal representing given gid
static Group fromGid(int gid) {
String name = null;
try {
name = Util.toString(getgrgid(gid));
} catch (UnixException x) {
name = Integer.toString(gid);
}
return new Group(gid, name);
}
// lookup user or group name
private static int lookupName(String name, boolean isGroup)
throws IOException
{
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new RuntimePermission("lookupUserInformation"));
}
int id = -1;
try {
id = (isGroup) ? getgrnam(name) : getpwnam(name);
} catch (UnixException x) {
throw new IOException(name + ": " + x.errorString());
}
if (id == -1) {
// lookup failed, allow input to be uid or gid
try {
id = Integer.parseInt(name);
} catch (NumberFormatException ignore) {
throw new UserPrincipalNotFoundException(name);
}
}
return id;
}
// lookup user name
static UserPrincipal lookupUser(String name) throws IOException {
if (name.equals(SPECIAL_OWNER.getName()))
return SPECIAL_OWNER;
if (name.equals(SPECIAL_GROUP.getName()))
return SPECIAL_GROUP;
if (name.equals(SPECIAL_EVERYONE.getName()))
return SPECIAL_EVERYONE;
int uid = lookupName(name, false);
return new User(uid, name);
}
// lookup group name
static GroupPrincipal lookupGroup(String group)
throws IOException
{
int gid = lookupName(group, true);
return new Group(gid, group);
}
}
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