256 lines
9.5 KiB
Java
256 lines
9.5 KiB
Java
package clientP2P;
|
||
|
||
import java.util.Scanner;
|
||
import java.util.Arrays;
|
||
import java.util.List;
|
||
import java.io.IOException;
|
||
import java.net.UnknownHostException;
|
||
import java.nio.file.Files;
|
||
import java.nio.file.Paths;
|
||
import java.security.MessageDigest;
|
||
import java.security.NoSuchAlgorithmException;
|
||
import localException.InternalError;
|
||
import localException.ProtocolError;
|
||
import localException.SizeError;
|
||
import localException.TransmissionError;
|
||
import localException.VersionError;
|
||
import remoteException.EmptyFile;
|
||
import remoteException.EmptyDirectory;
|
||
import remoteException.InternalRemoteError;
|
||
import remoteException.NotFound;
|
||
import remoteException.ProtocolRemoteError;
|
||
import remoteException.VersionRemoteError;
|
||
import remoteException.NotATracker;
|
||
import protocolP2P.ProtocolP2PPacketUDP;
|
||
import protocolP2P.Payload;
|
||
import protocolP2P.RequestResponseCode;
|
||
import protocolP2P.FileList;
|
||
import protocolP2P.HashAlgorithm;
|
||
import protocolP2P.DiscoverRequest;
|
||
import protocolP2P.DiscoverResponse;
|
||
import tools.HostItem;
|
||
import tools.Logger;
|
||
import tools.LogLevel;
|
||
import clientP2P.ClientDownloadUDP;
|
||
|
||
/** Implementation of P2P-JAVA-PROJECT CLIENT
|
||
* @author Louis Royer
|
||
* @author Flavien Haas
|
||
* @author JS Auge
|
||
* @version 1.0
|
||
*/
|
||
public class ClientManagementUDP implements Runnable {
|
||
private String baseDirectory;
|
||
private String partsSubdir;
|
||
private List<HostItem> hostList;
|
||
private HostItem tracker;
|
||
private Logger logger;
|
||
private Scanner scanner;
|
||
|
||
/** Constructor for UDP implementation, with baseDirectory, tracker, partsSubdir, logger and scanner parameters.
|
||
* @param baseDirectory the root directory where files are stored
|
||
* @param tracker tracker HostItem
|
||
* @param partsSubdir subdirectory to store file parts
|
||
* @param logger Loggger
|
||
* @param scanner Scanner used to read input
|
||
*/
|
||
public ClientManagementUDP(String baseDirectory, HostItem tracker, String partsSubdir, Logger logger, Scanner scanner) {
|
||
this.scanner = scanner;
|
||
this.baseDirectory = baseDirectory;
|
||
this.tracker = tracker;
|
||
this.partsSubdir = partsSubdir;
|
||
this.logger = logger;
|
||
try {
|
||
initHostList();
|
||
} catch (InternalError e) {
|
||
System.exit(-1);
|
||
} catch (ProtocolError e) {
|
||
System.exit(-2);
|
||
}
|
||
}
|
||
|
||
/** Implementation of Runnable
|
||
*/
|
||
public void run() {
|
||
try {
|
||
String[] list = listDirectory();
|
||
System.out.println("Files present on the server:");
|
||
for(String listItem: list) {
|
||
System.out.println(listItem);
|
||
}
|
||
System.out.println("Name of the file to download:");
|
||
String f = scanner.nextLine();
|
||
download(f);
|
||
System.out.println("File " + f + " sucessfully downloaded");
|
||
logger.writeUDP("File " + f + " sucessfully downloaded", LogLevel.Info);
|
||
} catch (EmptyDirectory e) {
|
||
System.err.println("Error: Server has no file in directory");
|
||
logger.writeUDP("Error: Server has no file in directory", LogLevel.Error);
|
||
} catch (InternalError e) {
|
||
System.err.println("Error: Client internal error");
|
||
logger.writeUDP("Error: Client internal error", LogLevel.Error);
|
||
} catch (UnknownHostException e) {
|
||
System.err.println("Error: Server host is unknown");
|
||
logger.writeUDP("Error: Server host is unknown", LogLevel.Error);
|
||
} catch (IOException e) {
|
||
System.err.println("Error: Request cannot be send or response cannot be received");
|
||
logger.writeUDP("Error: Request cannot be send or response cannot be received", LogLevel.Error);
|
||
} catch (TransmissionError e) {
|
||
System.err.println("Error: Message received is too big");
|
||
logger.writeUDP("Error: Message received is too big", LogLevel.Error);
|
||
} catch (ProtocolError e) {
|
||
System.err.println("Error: Cannot decode server’s response");
|
||
logger.writeUDP("Error: Cannot decode server’s response", LogLevel.Error);
|
||
} catch (VersionError e) {
|
||
System.err.println("Error: Server’s response use bad version of the protocol");
|
||
logger.writeUDP("Error: Server’s response use bad version of the protocol", LogLevel.Error);
|
||
} catch (SizeError e) {
|
||
System.err.println("Error: Cannot handle this packets because of internal representation limitations of numbers on the client");
|
||
logger.writeUDP("Error: Cannot handle this packets because of internal representation limitations of numbers on the client", LogLevel.Error);
|
||
} catch (InternalRemoteError e) {
|
||
System.err.println("Error: Server internal error");
|
||
logger.writeUDP("Error: Server internal error", LogLevel.Error);
|
||
} catch (ProtocolRemoteError e) {
|
||
System.err.println("Error: Server cannot decode client’s request");
|
||
logger.writeUDP("Error: Server cannot decode client’s request", LogLevel.Error);
|
||
} catch (VersionRemoteError e) {
|
||
System.err.println("Error: Server cannot decode this version of the protocol");
|
||
logger.writeUDP("Error: Server cannot decode this version of the protocol", LogLevel.Error);
|
||
} catch (NotFound e) {
|
||
System.err.println("Error: Server has not this file in directory");
|
||
logger.writeUDP("Error: Server has not this file in directory", LogLevel.Error);
|
||
} catch (EmptyFile e) {
|
||
System.err.println("Error: File is empty");
|
||
logger.writeUDP("Error: File is empty", LogLevel.Error);
|
||
}
|
||
}
|
||
|
||
/** Try to download a file
|
||
* @param filename name of the file to download
|
||
* @throws NotFound
|
||
* @throws InternalError
|
||
* @throws UnknownHostException
|
||
* @throws IOException
|
||
* @throws TransmissionError
|
||
* @throws ProtocolError
|
||
* @throws VersionError
|
||
* @throws SizeError
|
||
* @throws InternalRemoteError
|
||
* @throws ProtocolRemoteError
|
||
* @throws VersionRemoteError
|
||
* @throws EmptyFile
|
||
*/
|
||
private void download(String filename) throws EmptyFile, NotFound, InternalError, UnknownHostException, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
|
||
ClientDownloadUDP downLoader = new ClientDownloadUDP(filename, hostList, partsSubdir, baseDirectory, logger);
|
||
Thread t = new Thread(downLoader);
|
||
t.start();
|
||
try {
|
||
t.join();
|
||
if (downLoader.getSuccess()) {
|
||
byte[] hash512 = downLoader.getHashSum512();
|
||
if (!Arrays.equals(hash512, computeHashsum(filename, HashAlgorithm.SHA512))) {
|
||
System.err.println("Error: Hashsum does not match");
|
||
System.err.println("Computed checksum:");
|
||
byte[] c = computeHashsum(filename, HashAlgorithm.SHA512);
|
||
for (byte b: c) {
|
||
System.err.print(String.format("%02X", b));
|
||
logger.writeUDP("Computed checksum:" + String.format("%02X", b), LogLevel.Info);
|
||
}
|
||
System.err.println("");
|
||
System.err.println("Received checksum:");
|
||
for (byte b: hash512) {
|
||
System.err.print(String.format("%02X", b));
|
||
logger.writeUDP("Received checksum:" + String.format("%02X", b), LogLevel.Info);
|
||
}
|
||
System.err.println("");
|
||
throw new InternalError();
|
||
}
|
||
} else {
|
||
throw new InternalError();
|
||
}
|
||
} catch (InterruptedException e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new InternalError();
|
||
}
|
||
}
|
||
|
||
/** list server’s directory content
|
||
* @return list of files
|
||
* @throws InternalError
|
||
* @throws UnknowHostException
|
||
* @throws IOException
|
||
* @throws TransmissionError
|
||
* @throws ProtocolError
|
||
* @throws VersionError
|
||
* @throws SizeError
|
||
* @throws EmptyDirectory
|
||
* @throws InternalRemoteError
|
||
* @throws ProtocolRemoteError
|
||
* @throws VersionRemoteError
|
||
*/
|
||
private String[] listDirectory() throws EmptyDirectory, InternalError, UnknownHostException, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
|
||
ProtocolP2PPacketUDP<Payload> d = new ProtocolP2PPacketUDP<>(new Payload(RequestResponseCode.LIST_REQUEST));
|
||
d.sendRequest((Object)hostList.get(0).getUDPSocket());
|
||
try {
|
||
Payload p = d.receiveResponse().getPayload();
|
||
assert p instanceof FileList : "This payload must be instance of Filelist";
|
||
if (!(p instanceof FileList)) {
|
||
throw new InternalError();
|
||
} else {
|
||
return ((FileList)p).getFileList();
|
||
}
|
||
} catch (NotFound e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new ProtocolError();
|
||
} catch (EmptyFile e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new ProtocolError();
|
||
} catch (NotATracker e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new ProtocolError();
|
||
}
|
||
}
|
||
|
||
/** Compute Hashsum of a file.
|
||
* @param filename
|
||
* @return hashsum
|
||
*/
|
||
private byte[] computeHashsum(String filename, HashAlgorithm h) {
|
||
try {
|
||
MessageDigest md = MessageDigest.getInstance(HashAlgorithm.SHA512.getName());
|
||
return md.digest(Files.readAllBytes(Paths.get(baseDirectory + filename)));
|
||
} catch (NoSuchAlgorithmException e) {
|
||
System.out.println("Error: " + h.getName() + " not supported");
|
||
logger.writeUDP("Error: " + h.getName() + " not supported", LogLevel.Error);
|
||
} catch (IOException e) {
|
||
System.out.println("Error: cannot read " + filename);
|
||
logger.writeUDP("Error: cannot read " + filename, LogLevel.Error);
|
||
}
|
||
return new byte[0];
|
||
}
|
||
|
||
/** Initialize hostList from tracker
|
||
* @throws ProtocolError
|
||
* @throws InternalError
|
||
*/
|
||
private void initHostList() throws ProtocolError, InternalError {
|
||
ProtocolP2PPacketUDP<DiscoverRequest> d = new ProtocolP2PPacketUDP<>(new DiscoverRequest(null));
|
||
try {
|
||
d.sendRequest((Object)tracker.getUDPSocket());
|
||
Payload p = d.receiveResponse().getPayload();
|
||
assert p instanceof DiscoverResponse : "This payload must be instance of Filelist";
|
||
if (!(p instanceof DiscoverResponse)) {
|
||
throw new InternalError();
|
||
} else {
|
||
hostList = ((DiscoverResponse)p).getHostList();
|
||
}
|
||
} catch (NotATracker e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new ProtocolError();
|
||
} catch (Exception e) {
|
||
logger.writeUDP(e, LogLevel.Error);
|
||
throw new ProtocolError();
|
||
}
|
||
}
|
||
}
|