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Smack/source/org/jivesoftware/smack/DefaultRosterStore.java

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/**
* All rights reserved. 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.jivesoftware.smack;
import java.io.File;
import java.io.FileFilter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.jivesoftware.smack.packet.RosterPacket;
import org.jivesoftware.smack.packet.RosterPacket.Item;
import org.jivesoftware.smack.util.Base32Encoder;
import org.jivesoftware.smack.util.StringUtils;
import org.xmlpull.mxp1.MXParser;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
/**
* Stores roster entries as specified by RFC 6121 for roster versioning
* in a set of files.
*
* @author Lars Noschinski
* @author Fabian Schuetz
*/
public class DefaultRosterStore implements RosterStore {
private final File fileDir;
private static final String ENTRY_PREFIX = "entry-";
private static final String VERSION_FILE_NAME = "__version__";
private static final String STORE_ID = "DEFAULT_ROSTER_STORE";
private static final FileFilter rosterDirFilter = new FileFilter() {
@Override
public boolean accept(File file) {
String name = file.getName();
return name.startsWith(ENTRY_PREFIX);
}
};
/**
* @param baseDir
* will be the directory where all roster entries are stored. One
* file for each entry, such that file.name = entry.username.
* There is also one special file '__version__' that contains the
* current version string.
*/
private DefaultRosterStore(final File baseDir) {
this.fileDir = baseDir;
}
/**
* Creates a new roster store on disk
*
* @param baseDir
* The directory to create the store in. The directory should
* be empty
* @return A {@link DefaultRosterStore} instance if successful,
* <code>null</code> else.
*/
public static DefaultRosterStore init(final File baseDir) {
DefaultRosterStore store = new DefaultRosterStore(baseDir);
if (store.setRosterVersion("")) {
return store;
}
else {
return null;
}
}
/**
* Opens a roster store
* @param baseDir
* The directory containing the roster store.
* @return A {@link DefaultRosterStore} instance if successful,
* <code>null</code> else.
*/
public static DefaultRosterStore open(final File baseDir) {
DefaultRosterStore store = new DefaultRosterStore(baseDir);
String s = store.readFile(store.getVersionFile());
if (s != null && s.startsWith(STORE_ID + "\n")) {
return store;
}
else {
return null;
}
}
private File getVersionFile() {
return new File(fileDir, VERSION_FILE_NAME);
}
@Override
public List<Item> getEntries() {
List<Item> entries = new ArrayList<RosterPacket.Item>();
for (File file : fileDir.listFiles(rosterDirFilter)) {
Item entry = readEntry(file);
if (entry == null) {
log("Roster store file '" + file + "' is invalid.");
}
else {
entries.add(entry);
}
}
return entries;
}
@Override
public Item getEntry(String bareJid) {
return readEntry(getBareJidFile(bareJid));
}
@Override
public String getRosterVersion() {
String s = readFile(getVersionFile());
if (s == null) {
return null;
}
String[] lines = s.split("\n", 2);
if (lines.length < 2) {
return null;
}
return lines[1];
}
private boolean setRosterVersion(String version) {
return writeFile(getVersionFile(), STORE_ID + "\n" + version);
}
@Override
public boolean addEntry(Item item, String version) {
return addEntryRaw(item) && setRosterVersion(version);
}
@Override
public boolean removeEntry(String bareJid, String version) {
try {
return getBareJidFile(bareJid).delete() && setRosterVersion(version);
}
catch (SecurityException e) {
e.printStackTrace();
return false;
}
}
@Override
public boolean resetEntries(Collection<Item> items, String version) {
try {
for (File file : fileDir.listFiles(rosterDirFilter)) {
file.delete();
}
} catch (SecurityException e) {
e.printStackTrace();
return false;
}
for (Item item : items) {
if (!addEntryRaw(item)) {
return false;
}
}
return setRosterVersion(version);
}
private Item readEntry(File file) {
String s = readFile(file);
if (s == null) {
return null;
}
String user = null;
String name = null;
String type = null;
String status = null;
List<String> groupNames = new ArrayList<String>();
try {
XmlPullParser parser = new MXParser();
parser.setInput(new StringReader(s));
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("item")) {
user = parser.getAttributeValue(null, "user");
name = parser.getAttributeValue(null, "name");
type = parser.getAttributeValue(null, "type");
status = parser.getAttributeValue(null, "status");
}
if (parser.getName().equals("group")) {
String group = parser.getAttributeValue(null, "name");
if (group != null) {
groupNames.add(group);
}
else {
log("Invalid group entry in store entry file "
+ file);
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("item")) {
done = true;
}
}
}
}
catch (IOException e) {
e.printStackTrace();;
return null;
}
catch (XmlPullParserException e) {
log("Invalid group entry in store entry file "
+ file);
e.printStackTrace();
return null;
}
if (user == null) {
return null;
}
RosterPacket.Item item = new RosterPacket.Item(user, name);
for (String groupName : groupNames) {
item.addGroupName(groupName);
}
if (type != null) {
try {
item.setItemType(RosterPacket.ItemType.valueOf(type));
}
catch (IllegalArgumentException e) {
log("Invalid type in store entry file " + file);
return null;
}
if (status != null) {
RosterPacket.ItemStatus itemStatus = RosterPacket.ItemStatus
.fromString(status);
if (itemStatus == null) {
log("Invalid status in store entry file " + file);
return null;
}
item.setItemStatus(itemStatus);
}
}
return item;
}
private boolean addEntryRaw (Item item) {
StringBuilder s = new StringBuilder();
s.append("<item ");
s.append(StringUtils.xmlAttrib("user", item.getUser()));
s.append(" ");
if (item.getName() != null) {
s.append(StringUtils.xmlAttrib("name", item.getName()));
s.append(" ");
}
if (item.getItemType() != null) {
s.append(StringUtils.xmlAttrib("type", item.getItemType().name()));
s.append(" ");
}
if (item.getItemStatus() != null) {
s.append(StringUtils.xmlAttrib("status", item.getItemStatus().toString()));
s.append(" ");
}
s.append(">");
for (String group : item.getGroupNames()) {
s.append("<group ");
s.append(StringUtils.xmlAttrib("name", group));
s.append(" />");
}
s.append("</item>");
return writeFile(getBareJidFile(item.getUser()), s.toString());
}
private File getBareJidFile(String bareJid) {
String encodedJid = Base32Encoder.getInstance().encode(bareJid);
return new File(fileDir, ENTRY_PREFIX + encodedJid);
}
private String readFile(File file) {
try {
Reader reader = null;
try {
char buf[] = new char[8192];
int len;
StringBuilder s = new StringBuilder();
reader = new FileReader(file);
while ((len = reader.read(buf)) >= 0) {
s.append(buf, 0, len);
}
return s.toString();
}
finally {
if (reader != null) {
reader.close();
}
}
}
catch (FileNotFoundException e) {
return null;
}
catch (IOException e) {
e.printStackTrace();
}
return null;
}
private boolean writeFile(File file, String content) {
try {
FileWriter writer = new FileWriter(file, false);
writer.write(content);
writer.close();
return true;
}
catch (IOException e) {
e.printStackTrace();
return false;
}
}
private void log(String error) {
System.err.println(error);
}
}