package be.nikiroo.jvcard.remote;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.security.InvalidParameterException;
import java.time.LocalDate;
import java.util.List;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import be.nikiroo.jvcard.Card;
import be.nikiroo.jvcard.parsers.Format;
import be.nikiroo.jvcard.parsers.Parser;
import be.nikiroo.jvcard.remote.Command.Verb;
import be.nikiroo.jvcard.resources.Bundles;
import be.nikiroo.jvcard.tui.StringUtils;
/**
* This class will synchronise {@link Card}s between a local instance an a
* remote jVCard server.
*
* @author niki
*
*/
public class Sync {
/** The time in ms after which we declare that 2 timestamps are different */
static private final int GRACE_TIME = 2000;
/** Directory where to store local cache of remote {@link Card}s. */
static private File cacheDir;
/**
* Directory where to store cache of remote {@link Card}s without
* modifications since the last synchronisation.
*/
static private File cacheDirOrig;
/** Directory where to store timestamps for files in cacheDirOrig */
static private File cacheDirOrigTS;
static private boolean autoSync;
private String host;
private int port;
/** Resource name on the remote server. */
private String name;
/**
* Create a new {@link Sync} object, ready to operate for the given resource
* on the given server.
*
*
* Note that the format used is the standard "host:port_number/file", with
* an optional jvcard:// prefix.
*
*
*
* E.g.: jvcard://localhost:4444/family.vcf
*
*
* @param url
* the server and port to contact, optionally prefixed with
* jvcard://
*
* @throws InvalidParameterException
* if the remote configuration file remote.properties
* cannot be accessed or if the cache directory cannot be used
*/
public Sync(String url) {
if (cacheDir == null) {
config();
}
try {
url = url.replace("jvcard://", "");
int indexSl = url.indexOf('/');
this.name = url.substring(indexSl + 1);
url = url.substring(0, indexSl);
this.host = url.split("\\:")[0];
this.port = Integer.parseInt(url.split("\\:")[1]);
} catch (Exception e) {
throw new InvalidParameterException(
"the given parameter was not a valid HOST:PORT value: "
+ url);
}
}
/**
* Create a new {@link Sync} object, ready to operate on the given server.
*
*
* @param host
* the server to contact
* @param port
* the port to use
* @param name
* the resource name to synchronise to
*/
public Sync(String host, int port, String name) {
this.host = host;
this.port = port;
this.name = name;
}
/**
* Check if the synchronisation is available for this resource.
*
* @return TRUE if it is possible to contact the remote server and that this
* server has the resource available
*/
public boolean isAvailable() {
try {
SimpleSocket s = new SimpleSocket(new Socket(host, port),
"check avail client");
s.open(true);
s.sendCommand(Verb.LIST);
List timestampedFiles = s.receiveBlock();
s.close();
for (String timestampedFile : timestampedFiles) {
String file = timestampedFile.substring(StringUtils.fromTime(0)
.length() + 1);
if (file.equals(name)) {
return true;
}
}
} catch (Exception e) {
}
return false;
}
// return: synced or not
public boolean sync(Card card, boolean force) throws UnknownHostException,
IOException {
long tsOriginal = getLastModified();
// do NOT update unless we are in autoSync or forced mode or we don't
// have the file on cache
if (!autoSync && !force && tsOriginal != -1) {
return false;
}
SimpleSocket s = new SimpleSocket(new Socket(host, port), "sync client");
// get the server time stamp
long tsServer = -1;
try {
s.open(true);
s.sendCommand(Verb.LIST);
List timestampedFiles = s.receiveBlock();
for (String timestampedFile : timestampedFiles) {
String file = timestampedFile.substring(StringUtils.fromTime(0)
.length() + 1);
if (file.equals(name)) {
tsServer = StringUtils.toTime(timestampedFile.substring(0,
StringUtils.fromTime(0).length()));
break;
}
}
} catch (IOException e) {
s.close();
throw e;
} catch (Exception e) {
e.printStackTrace();
s.close();
return false;
}
// Error cases:
// - file not preset neither in cache nor on server
// - remote < previous
if ((tsServer == -1 && tsOriginal == -1)
|| (tsServer != -1 && tsOriginal != -1 && ((tsOriginal - tsServer) > GRACE_TIME))) {
throw new IOException(
"The timestamps between server and client are invalid");
}
// Check changes
boolean serverChanges = (tsServer - tsOriginal) > GRACE_TIME;
boolean localChanges = false;
if (tsOriginal != -1) {
Card local = new Card(getCache(cacheDir), Format.VCard21);
Card original = new Card(getCache(cacheDirOrig), Format.VCard21);
localChanges = !local.isEquals(original, true);
}
Verb action = null;
// Sync to server if:
if (localChanges) {
// TODO: sync instead (with PUT)
action = Verb.POST;
}
// Sync from server if
if (serverChanges && localChanges) {
// TODO
throw new IOException("Sync operation not supported yet :(");
}
// PUT the whole file if:
if (tsServer == -1) {
action = Verb.POST;
}
// GET the whole file if:
if (tsOriginal == -1 || serverChanges) {
action = Verb.GET;
}
System.err.println("remote: " + (tsServer / 1000) % 1000 + " ("
+ tsServer + ")");
System.err.println("previous: " + (tsOriginal / 1000) % 1000 + " ("
+ tsOriginal + ")");
System.err.println("local changes: " + localChanges);
System.err.println("server changes: " + serverChanges);
System.err.println("choosen action: " + action);
if (action != null) {
switch (action) {
case GET:
s.sendCommand(Verb.GET, name);
List data = s.receiveBlock();
setLastModified(data.remove(0));
Card server = new Card(Parser.parse(data, Format.VCard21));
card.replaceListContent(server);
if (card.isDirty())
card.save();
card.saveAs(getCache(cacheDirOrig), Format.VCard21);
break;
case POST:
s.sendCommand(Verb.POST, name);
s.sendLine(card.toString(Format.VCard21));
card.saveAs(getCache(cacheDirOrig), Format.VCard21);
setLastModified(s.receiveLine());
break;
default:
// TODO
throw new IOException(action
+ " operation not supported yet :(");
}
}
s.close();
return true;
}
/**
* Return the requested cache for the current resource.
*
* @param dir
* the cache to use
*
* @return the cached {@link File}
*/
private File getCache(File dir) {
return new File(dir.getPath() + File.separator + name);
}
/**
* Return the cached {@link File} corresponding to the current resource.
*
* @return the cached {@link File}
*/
public File getCache() {
return new File(cacheDir.getPath() + File.separator + name);
}
/**
* Get the last modified date of the current resource's original cached
* file, that is, the time the server reported as the "last modified time"
* when this resource was transfered.
*
* @return the last modified time from the server back when this resource
* was transfered
*/
public long getLastModified() {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream(cacheDirOrigTS.getPath()
+ File.separator + name)));
String line = in.readLine();
in.close();
return StringUtils.toTime(line);
} catch (FileNotFoundException e) {
return -1;
} catch (Exception e) {
return -1;
}
}
/**
* Set the last modified date of the current resource's original cached
* file, that is, the time the server reported as the "last modified time"
* when this resource was transfered.
*
* @param time
* the last modified time from the server back when this resource
* was transfered
*/
public void setLastModified(String time) {
try {
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(cacheDirOrigTS.getPath()
+ File.separator + name)));
out.append(time);
out.newLine();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Configure the synchronisation mechanism (cache, auto update...).
*
* @throws InvalidParameterException
* if the remote configuration file remote.properties
* cannot be accessed or if the cache directory cannot be used
*/
static private void config() {
String dir = null;
ResourceBundle bundle = Bundles.getBundle("remote");
try {
dir = bundle.getString("CLIENT_CACHE_DIR").trim();
cacheDir = new File(dir + File.separator + "current");
cacheDir.mkdir();
cacheDirOrig = new File(dir + File.separator + "original");
cacheDirOrig.mkdir();
cacheDirOrigTS = new File(dir + File.separator + "timestamps");
cacheDirOrigTS.mkdir();
if (!cacheDir.exists() || !cacheDirOrig.exists()) {
throw new IOException("Cannot open or create cache store at: "
+ dir);
}
String autoStr = bundle.getString("CLIENT_AUTO_SYNC");
if (autoStr != null && autoStr.trim().equalsIgnoreCase("true")) {
autoSync = true;
}
} catch (MissingResourceException e) {
throw new InvalidParameterException(
"Cannot access remote.properties configuration file");
} catch (Exception e) {
throw new InvalidParameterException(
"Cannot open or create cache store at: " + dir);
}
}
}