Tomcat example source code file (MemoryUserDatabase.java)
The Tomcat MemoryUserDatabase.java source code/*
* 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.catalina.users;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import org.apache.catalina.Group;
import org.apache.catalina.Role;
import org.apache.catalina.User;
import org.apache.catalina.UserDatabase;
import org.apache.catalina.util.StringManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.digester.Digester;
import org.apache.tomcat.util.digester.ObjectCreationFactory;
import org.xml.sax.Attributes;
/**
* <p>Concrete implementation of {@link UserDatabase} that loads all
* defined users, groups, and roles into an in-memory data structure,
* and uses a specified XML file for its persistent storage.</p>
*
* @author Craig R. McClanahan
* @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
* @since 4.1
*/
public class MemoryUserDatabase implements UserDatabase {
private static Log log = LogFactory.getLog(MemoryUserDatabase.class);
// ----------------------------------------------------------- Constructors
/**
* Create a new instance with default values.
*/
public MemoryUserDatabase() {
super();
}
/**
* Create a new instance with the specified values.
*
* @param id Unique global identifier of this user database
*/
public MemoryUserDatabase(String id) {
super();
this.id = id;
}
// ----------------------------------------------------- Instance Variables
/**
* The set of {@link Group}s defined in this database, keyed by
* group name.
*/
protected HashMap groups = new HashMap();
/**
* The unique global identifier of this user database.
*/
protected String id = null;
/**
* The relative (to <code>catalina.base) or absolute pathname to
* the XML file in which we will save our persistent information.
*/
protected String pathname = "conf/tomcat-users.xml";
/**
* The relative or absolute pathname to the file in which our old
* information is stored while renaming is in progress.
*/
protected String pathnameOld = pathname + ".old";
/**
* The relative or absolute pathname ot the file in which we write
* our new information prior to renaming.
*/
protected String pathnameNew = pathname + ".new";
/**
* A flag, indicating if the user database is read only.
*/
protected boolean readonly = false;
/**
* The set of {@link Role}s defined in this database, keyed by
* role name.
*/
protected HashMap roles = new HashMap();
/**
* The string manager for this package.
*/
private static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The set of {@link User}s defined in this database, keyed by
* user name.
*/
protected HashMap users = new HashMap();
// ------------------------------------------------------------- Properties
/**
* Return the set of {@link Group}s defined in this user database.
*/
public Iterator getGroups() {
synchronized (groups) {
return (groups.values().iterator());
}
}
/**
* Return the unique global identifier of this user database.
*/
public String getId() {
return (this.id);
}
/**
* Return the relative or absolute pathname to the persistent storage file.
*/
public String getPathname() {
return (this.pathname);
}
/**
* Set the relative or absolute pathname to the persistent storage file.
*
* @param pathname The new pathname
*/
public void setPathname(String pathname) {
this.pathname = pathname;
this.pathnameOld = pathname + ".old";
this.pathnameNew = pathname + ".new";
}
/**
* Returning the readonly status of the user database
*/
public boolean getReadonly() {
return (this.readonly);
}
/**
* Setting the readonly status of the user database
*
* @param pathname The new pathname
*/
public void setReadonly(boolean readonly) {
this.readonly = readonly;
}
/**
* Return the set of {@link Role}s defined in this user database.
*/
public Iterator getRoles() {
synchronized (roles) {
return (roles.values().iterator());
}
}
/**
* Return the set of {@link User}s defined in this user database.
*/
public Iterator getUsers() {
synchronized (users) {
return (users.values().iterator());
}
}
// --------------------------------------------------------- Public Methods
/**
* Finalize access to this user database.
*
* @exception Exception if any exception is thrown during closing
*/
public void close() throws Exception {
save();
synchronized (groups) {
synchronized (users) {
users.clear();
groups.clear();
}
}
}
/**
* Create and return a new {@link Group} defined in this user database.
*
* @param groupname The group name of the new group (must be unique)
* @param description The description of this group
*/
public Group createGroup(String groupname, String description) {
MemoryGroup group = new MemoryGroup(this, groupname, description);
synchronized (groups) {
groups.put(group.getGroupname(), group);
}
return (group);
}
/**
* Create and return a new {@link Role} defined in this user database.
*
* @param rolename The role name of the new group (must be unique)
* @param description The description of this group
*/
public Role createRole(String rolename, String description) {
MemoryRole role = new MemoryRole(this, rolename, description);
synchronized (roles) {
roles.put(role.getRolename(), role);
}
return (role);
}
/**
* Create and return a new {@link User} defined in this user database.
*
* @param username The logon username of the new user (must be unique)
* @param password The logon password of the new user
* @param fullName The full name of the new user
*/
public User createUser(String username, String password,
String fullName) {
MemoryUser user = new MemoryUser(this, username, password, fullName);
synchronized (users) {
users.put(user.getUsername(), user);
}
return (user);
}
/**
* Return the {@link Group} with the specified group name, if any;
* otherwise return <code>null.
*
* @param groupname Name of the group to return
*/
public Group findGroup(String groupname) {
synchronized (groups) {
return ((Group) groups.get(groupname));
}
}
/**
* Return the {@link Role} with the specified role name, if any;
* otherwise return <code>null.
*
* @param rolename Name of the role to return
*/
public Role findRole(String rolename) {
synchronized (roles) {
return ((Role) roles.get(rolename));
}
}
/**
* Return the {@link User} with the specified user name, if any;
* otherwise return <code>null.
*
* @param username Name of the user to return
*/
public User findUser(String username) {
synchronized (users) {
return ((User) users.get(username));
}
}
/**
* Initialize access to this user database.
*
* @exception Exception if any exception is thrown during opening
*/
public void open() throws Exception {
synchronized (groups) {
synchronized (users) {
// Erase any previous groups and users
users.clear();
groups.clear();
roles.clear();
// Construct a reader for the XML input file (if it exists)
File file = new File(pathname);
if (!file.isAbsolute()) {
file = new File(System.getProperty("catalina.base"),
pathname);
}
if (!file.exists()) {
return;
}
FileInputStream fis = new FileInputStream(file);
// Construct a digester to read the XML input file
Digester digester = new Digester();
digester.addFactoryCreate
("tomcat-users/group",
new MemoryGroupCreationFactory(this));
digester.addFactoryCreate
("tomcat-users/role",
new MemoryRoleCreationFactory(this));
digester.addFactoryCreate
("tomcat-users/user",
new MemoryUserCreationFactory(this));
// Parse the XML input file to load this database
try {
digester.parse(fis);
fis.close();
} catch (Exception e) {
try {
fis.close();
} catch (Throwable t) {
;
}
throw e;
}
}
}
}
/**
* Remove the specified {@link Group} from this user database.
*
* @param group The group to be removed
*/
public void removeGroup(Group group) {
synchronized (groups) {
Iterator users = getUsers();
while (users.hasNext()) {
User user = (User) users.next();
user.removeGroup(group);
}
groups.remove(group.getGroupname());
}
}
/**
* Remove the specified {@link Role} from this user database.
*
* @param role The role to be removed
*/
public void removeRole(Role role) {
synchronized (roles) {
Iterator groups = getGroups();
while (groups.hasNext()) {
Group group = (Group) groups.next();
group.removeRole(role);
}
Iterator users = getUsers();
while (users.hasNext()) {
User user = (User) users.next();
user.removeRole(role);
}
roles.remove(role.getRolename());
}
}
/**
* Remove the specified {@link User} from this user database.
*
* @param user The user to be removed
*/
public void removeUser(User user) {
synchronized (users) {
users.remove(user.getUsername());
}
}
/**
* Check for permissions to save this user database
* to persistent storage location
*
*/
public boolean isWriteable() {
File file = new File(pathname);
if (!file.isAbsolute()) {
file = new File(System.getProperty("catalina.base"),
pathname);
}
File dir = file.getParentFile();
return dir.exists() && dir.isDirectory() && dir.canWrite();
}
/**
* Save any updated information to the persistent storage location for
* this user database.
*
* @exception Exception if any exception is thrown during saving
*/
public void save() throws Exception {
if (getReadonly()) {
return;
}
if (!isWriteable()) {
log.warn(sm.getString("memoryUserDatabase.notPersistable"));
return;
}
// Write out contents to a temporary file
File fileNew = new File(pathnameNew);
if (!fileNew.isAbsolute()) {
fileNew =
new File(System.getProperty("catalina.base"), pathnameNew);
}
PrintWriter writer = null;
try {
// Configure our PrintWriter
FileOutputStream fos = new FileOutputStream(fileNew);
OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF8");
writer = new PrintWriter(osw);
// Print the file prolog
writer.println("<?xml version='1.0' encoding='utf-8'?>");
writer.println("<tomcat-users>");
// Print entries for each defined role, group, and user
Iterator values = null;
values = getRoles();
while (values.hasNext()) {
writer.print(" ");
writer.println(values.next());
}
values = getGroups();
while (values.hasNext()) {
writer.print(" ");
writer.println(values.next());
}
values = getUsers();
while (values.hasNext()) {
writer.print(" ");
writer.println(values.next());
}
// Print the file epilog
writer.println("</tomcat-users>");
// Check for errors that occurred while printing
if (writer.checkError()) {
writer.close();
fileNew.delete();
throw new IOException
(sm.getString("memoryUserDatabase.writeException",
fileNew.getAbsolutePath()));
}
writer.close();
} catch (IOException e) {
if (writer != null) {
writer.close();
}
fileNew.delete();
throw e;
}
// Perform the required renames to permanently save this file
File fileOld = new File(pathnameOld);
if (!fileOld.isAbsolute()) {
fileOld =
new File(System.getProperty("catalina.base"), pathnameOld);
}
fileOld.delete();
File fileOrig = new File(pathname);
if (!fileOrig.isAbsolute()) {
fileOrig =
new File(System.getProperty("catalina.base"), pathname);
}
if (fileOrig.exists()) {
fileOld.delete();
if (!fileOrig.renameTo(fileOld)) {
throw new IOException
(sm.getString("memoryUserDatabase.renameOld",
fileOld.getAbsolutePath()));
}
}
if (!fileNew.renameTo(fileOrig)) {
if (fileOld.exists()) {
fileOld.renameTo(fileOrig);
}
throw new IOException
(sm.getString("memoryUserDatabase.renameNew",
fileOrig.getAbsolutePath()));
}
fileOld.delete();
}
/**
* Return a String representation of this UserDatabase.
*/
public String toString() {
StringBuffer sb = new StringBuffer("MemoryUserDatabase[id=");
sb.append(this.id);
sb.append(",pathname=");
sb.append(pathname);
sb.append(",groupCount=");
sb.append(this.groups.size());
sb.append(",roleCount=");
sb.append(this.roles.size());
sb.append(",userCount=");
sb.append(this.users.size());
sb.append("]");
return (sb.toString());
}
// -------------------------------------------------------- Package Methods
/**
* Return the <code>StringManager for use in looking up messages.
*/
StringManager getStringManager() {
return (sm);
}
}
/**
* Digester object creation factory for group instances.
*/
class MemoryGroupCreationFactory implements ObjectCreationFactory {
public MemoryGroupCreationFactory(MemoryUserDatabase database) {
this.database = database;
}
public Object createObject(Attributes attributes) {
String groupname = attributes.getValue("groupname");
if (groupname == null) {
groupname = attributes.getValue("name");
}
String description = attributes.getValue("description");
String roles = attributes.getValue("roles");
Group group = database.createGroup(groupname, description);
if (roles != null) {
while (roles.length() > 0) {
String rolename = null;
int comma = roles.indexOf(',');
if (comma >= 0) {
rolename = roles.substring(0, comma).trim();
roles = roles.substring(comma + 1);
} else {
rolename = roles.trim();
roles = "";
}
if (rolename.length() > 0) {
Role role = database.findRole(rolename);
if (role == null) {
role = database.createRole(rolename, null);
}
group.addRole(role);
}
}
}
return (group);
}
private MemoryUserDatabase database = null;
private Digester digester = null;
public Digester getDigester() {
return (this.digester);
}
public void setDigester(Digester digester) {
this.digester = digester;
}
}
/**
* Digester object creation factory for role instances.
*/
class MemoryRoleCreationFactory implements ObjectCreationFactory {
public MemoryRoleCreationFactory(MemoryUserDatabase database) {
this.database = database;
}
public Object createObject(Attributes attributes) {
String rolename = attributes.getValue("rolename");
if (rolename == null) {
rolename = attributes.getValue("name");
}
String description = attributes.getValue("description");
Role role = database.createRole(rolename, description);
return (role);
}
private MemoryUserDatabase database = null;
private Digester digester = null;
public Digester getDigester() {
return (this.digester);
}
public void setDigester(Digester digester) {
this.digester = digester;
}
}
/**
* Digester object creation factory for user instances.
*/
class MemoryUserCreationFactory implements ObjectCreationFactory {
public MemoryUserCreationFactory(MemoryUserDatabase database) {
this.database = database;
}
public Object createObject(Attributes attributes) {
String username = attributes.getValue("username");
if (username == null) {
username = attributes.getValue("name");
}
String password = attributes.getValue("password");
String fullName = attributes.getValue("fullName");
if (fullName == null) {
fullName = attributes.getValue("fullname");
}
String groups = attributes.getValue("groups");
String roles = attributes.getValue("roles");
User user = database.createUser(username, password, fullName);
if (groups != null) {
while (groups.length() > 0) {
String groupname = null;
int comma = groups.indexOf(',');
if (comma >= 0) {
groupname = groups.substring(0, comma).trim();
groups = groups.substring(comma + 1);
} else {
groupname = groups.trim();
groups = "";
}
if (groupname.length() > 0) {
Group group = database.findGroup(groupname);
if (group == null) {
group = database.createGroup(groupname, null);
}
user.addGroup(group);
}
}
}
if (roles != null) {
while (roles.length() > 0) {
String rolename = null;
int comma = roles.indexOf(',');
if (comma >= 0) {
rolename = roles.substring(0, comma).trim();
roles = roles.substring(comma + 1);
} else {
rolename = roles.trim();
roles = "";
}
if (rolename.length() > 0) {
Role role = database.findRole(rolename);
if (role == null) {
role = database.createRole(rolename, null);
}
user.addRole(role);
}
}
}
return (user);
}
private MemoryUserDatabase database = null;
private Digester digester = null;
public Digester getDigester() {
return (this.digester);
}
public void setDigester(Digester digester) {
this.digester = digester;
}
}
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