Louis
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Je suis en train de faire en sorte qu’on télécharge depuis plusieurs
280 lines
10 KiB
Java
280 lines
10 KiB
Java
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 exception.SocketClosed;
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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.SocketException;
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import java.net.Socket;
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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 protocolP2P.ProtocolP2PPacketTCP;
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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 tools.HostItem;
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import java.util.List;
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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 ClientManagementTCP implements Runnable {
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private String baseDirectory;
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private List<HostItem> hostList;
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/** Constructor for TCP implementation, with baseDirectory and TCPPort 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 TCPPort the server will listen on this port
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*/
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public ClientManagementTCP(String baseDirectory, List<HostItem> hostList) {
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this.baseDirectory = baseDirectory;
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this.hostList = hostList;
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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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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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Scanner scanner = new Scanner(System.in);
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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 (SocketClosed e) {
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System.err.println("Error: Request cannot be send or response cannot be received");
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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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} finally {
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for (HostItem h: hostList) {
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h.closeTCPSocket();
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}
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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 SocketClosed
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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, SocketClosed, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
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byte [] hash512;
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final long MAX_PARTIAL_SIZE = 4096;
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HashAlgorithm[] hashesAlgo = new HashAlgorithm[1];
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hashesAlgo[0] = HashAlgorithm.SHA512;
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ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP((Payload) new HashRequest(filename, hashesAlgo));
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d.sendRequest((Object)hostList.get(0).getTCPSocket());
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try {
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Payload pHash = d.receiveResponse().getPayload();
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assert pHash instanceof HashResponse : "This payload must be instance of HashResponse";
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if (!(pHash instanceof HashResponse)) {
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throw new InternalError();
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} else {
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hash512 = ((HashResponse)pHash).getHash(HashAlgorithm.SHA512);
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if (hash512.length == 0) {
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System.err.println("Error: server do not support sha512 hashes");
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throw new InternalError();
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}
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}
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} catch (EmptyDirectory e) {
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System.err.println("Error: empty directory, but request was not LIST_REQUEST");
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throw new ProtocolError();
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}
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d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, 0, MAX_PARTIAL_SIZE));
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d.sendRequest((Object)hostList.get(0).getTCPSocket());
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boolean fileFullyWritten = false;
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long offset = 0;
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do {
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try {
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Payload p = d.receiveResponse().getPayload();
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assert p instanceof FilePart : "This payload must be instance of FilePart";
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if (!(p instanceof FilePart)) {
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throw new InternalError();
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} else {
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FilePart fp = (FilePart)p;
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if (!fp.getFilename().equals(filename)) {
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System.err.println("Error: wrong file received: `" + fp.getFilename() + "`");
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throw new ProtocolError();
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}
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if (fp.getOffset() == 0) {
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System.err.println("Receiving first partialContent");
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// first partialContent
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// increment offset
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offset = fp.getPartialContent().length;
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/* write first partialContent */
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try {
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Files.write(new File(baseDirectory + filename).toPath(), fp.getPartialContent());
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} catch (IOException e) {
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System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
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}
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// next partialContentRequest
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if (offset != fp.getTotalSize()) {
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System.err.println("Sending following request with offset: " + offset + " maxpartialsize: " + MAX_PARTIAL_SIZE);
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d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
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d.sendRequest((Object)hostList.get(0).getTCPSocket());
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} else {
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fileFullyWritten = true;
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}
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} else if (offset == fp.getOffset()){
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System.err.println("Receiving following partialContent (offset: " + offset + ")");
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// following
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// increment offset
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offset += fp.getPartialContent().length;
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/* write following partialContent at end of file*/
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try {
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Files.write(Paths.get(baseDirectory + filename), fp.getPartialContent(), StandardOpenOption.APPEND);
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} catch (IOException e) {
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System.err.println("Error: cannot write file (" + baseDirectory + filename + ")");
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}
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if (offset >= fp.getTotalSize()) {
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fileFullyWritten = true;
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} else {
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// next partialContentRequest
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d = new ProtocolP2PPacketTCP((Payload) new LoadRequest(filename, offset, MAX_PARTIAL_SIZE));
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d.sendRequest((Object)hostList.get(0).getTCPSocket());
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}
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} else {
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System.err.println("offset: " + fp.getOffset() + " ; content.length: " + fp.getPartialContent().length + " ; totalSize: " + fp.getTotalSize());
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System.err.println("Error: cannot handle non-consecutive partial files (not implemented)");
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throw new InternalError();
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}
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}
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} catch (EmptyDirectory e) {
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throw new ProtocolError();
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}
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} while(!fileFullyWritten);
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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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hostList.get(0).closeTCPSocket();
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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 SocketClosed
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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, SocketClosed, IOException, TransmissionError, ProtocolError, VersionError, SizeError, InternalRemoteError, ProtocolRemoteError, VersionRemoteError {
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ProtocolP2PPacketTCP d = new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.LIST_REQUEST));
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d.sendRequest((Object)hostList.get(0).getTCPSocket());
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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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