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