ajouté commentaires descriptifs

POO/src/communication/filetransfer/FileTransferClient.java

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+package communication.filetransfer;
+
+import java.io.File;
+
+import java.io.IOException;
+
+import java.util.ArrayList;
+
+import observers.ObserverInputMessage;
+
+public class FileTransferClient {
+
+	private int port;
+	private ArrayList<File> files;
+	private ObserverInputMessage obsInput;
+
+	/**
+	 * Create a client to transfer one or several files on the specified port of
+	 * localhost. A new Thread is created for each file. The files are sent one by
+	 * one to save bandwidth and avoid issues.
+	 * 
+	 * @param port        	The port of localhost on which to send the files.
+	 * @param filesToSend 	The file(s) to send.
+	 * @param o           	The observer to notify each time a file is fully sent.
+	 */
+	public FileTransferClient(int port, ArrayList<File> filesToSend, ObserverInputMessage o) {
+		this.port = port;
+		this.files = filesToSend;
+		this.obsInput = o;
+	}
+
+	/**
+	 * Try to send every file on localhost on the specified port with a new thread.
+	 * An observer is passed to the thread and it is notified each time a file is
+	 * fully sent.
+	 * 
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	public void sendFiles() throws IOException, InterruptedException {
+		for (File f : this.files) {
+			FileTransferSendingThread ftc = new FileTransferSendingThread(this.port, f, this.obsInput);
+			ftc.start();
+			ftc.join();
+		}
+
+	}
+
+}

POO/src/communication/filetransfer/FileTransferReceivingThread.java

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+package communication.filetransfer;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.SocketChannel;
+
+import messages.Message;
+import messages.MessageFichier;
+import observers.ObserverInputMessage;
+
+public class FileTransferReceivingThread extends Thread {
+
+	private SocketChannel sockTransfert;
+	private ObserverInputMessage obsInput;
+
+	/**
+	 * Create the thread that will receive one file during a file transfer. This
+	 * allows users to write in the chat while sending/receiving files.
+	 * 
+	 * @param sock 		The SocketChannel returned by ServerSocketChannel.accept().
+	 * @param o    		The observer to notify once the file is fully received.
+	 */
+	public FileTransferReceivingThread(SocketChannel sock, ObserverInputMessage o) {
+		this.sockTransfert = sock;
+		this.obsInput = o;
+	}
+
+	public void run() {
+		try {
+			int nbByteRead = 0;
+
+			// Buffer to receive a chunk of the file
+			ByteBuffer fileData = ByteBuffer.allocate(4 * FileTransferUtils.KB_SIZE);
+
+			// InputStream to read the first object which is a message containing the name
+			// and size of the file
+			ObjectInputStream inputFileInformation = new ObjectInputStream(
+					this.sockTransfert.socket().getInputStream());
+
+			int nbTotalBytesRead;
+
+			nbTotalBytesRead = 0;
+
+			Object o = inputFileInformation.readObject();
+			MessageFichier m = (MessageFichier) o;
+			String[] fileInfo = this.processFileInformation(m);
+			String filePath = FileTransferUtils.DOWNLOADS_RELATIVE_PATH + fileInfo[0];
+			long fileSize = Long.parseLong(fileInfo[1]);
+
+			// OutputStream to create the file if it does not exist
+			FileOutputStream fOutStream = new FileOutputStream(filePath);
+
+			// Channel to write the data received in the file
+			FileChannel fileWriter = fOutStream.getChannel();
+
+			while (nbTotalBytesRead < fileSize && (nbByteRead = this.sockTransfert.read(fileData)) > 0) {
+				fileData.flip();
+				fileWriter.write(fileData);
+				fileData.clear();
+
+				nbTotalBytesRead += nbByteRead;
+
+			}
+
+			fileWriter.close();
+			fOutStream.close();
+			inputFileInformation.close();
+
+			// Process the message to display (thumbnails in the case of images) and notify
+			// the observer
+			Message mUpdate = FileTransferUtils.processMessageToDisplay(new File(filePath));
+			mUpdate.setSender("other");
+			this.obsInput.updateInput(this, mUpdate);
+
+		} catch (IOException | ClassNotFoundException e) {
+			e.printStackTrace();
+		} finally {
+			try {
+				this.sockTransfert.close();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	/**
+	 * Split the content of a message with the separator ";". This function is only
+	 * used to read the name and the size of the file to receive.
+	 * 
+	 * @param m 	message containing the file's information (name and size).
+	 * @return An array with the file's name and the file's size respectively.
+	 */
+	private String[] processFileInformation(MessageFichier m) {
+		return m.getContenu().split(";");
+	}
+
+}

POO/src/communication/filetransfer/FileTransferSendingThread.java

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+package communication.filetransfer;
+
+import java.io.File;
+import java.io.IOException;
+
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.SocketChannel;
+import java.nio.file.Paths;
+
+import messages.MauvaisTypeMessageException;
+import messages.Message;
+import messages.MessageFichier;
+import messages.Message.TypeMessage;
+import observers.ObserverInputMessage;
+
+public class FileTransferSendingThread extends Thread {
+
+	private SocketChannel sockTransfert;
+	private File file;
+	private ObserverInputMessage obsInput;
+
+	/**
+	 * Create the thread that will send one file during a file transfer. This allows
+	 * users to write in the chat while sending/receiving files.
+	 * 
+	 * @param port       	The port on localhost to which the SocketChannel will connect.
+	 * @param fileToSend 	The file to send.
+	 * @param o          	The observer to notify once the file is fully received.
+	 * @throws IOException if the socket's creation fails.
+	 */
+	public FileTransferSendingThread(int port, File fileToSend, ObserverInputMessage o) throws IOException {
+		SocketChannel sock = SocketChannel.open();
+		SocketAddress addr = new InetSocketAddress(port);
+		sock.connect(addr);
+		this.sockTransfert = sock;
+		this.file = fileToSend;
+		this.obsInput = o;
+	}
+
+	public void run() {
+		try {
+
+			// Buffer to send a chunk of the file
+			ByteBuffer fileData = ByteBuffer.allocate(4 * FileTransferUtils.KB_SIZE);
+
+			// OutputStream to write the first object which is a message containing the name
+			// and size of the file
+			ObjectOutputStream outputFileInformation = new ObjectOutputStream(
+					this.sockTransfert.socket().getOutputStream());
+
+			// Channel to read the data of the file
+			FileChannel fileReader = FileChannel.open(Paths.get(file.getPath()));
+			String str = file.getName() + ";" + file.getTotalSpace();
+
+			// Send file data (name + size);
+			outputFileInformation.writeObject(new MessageFichier(TypeMessage.FICHIER, str, ""));
+
+			while (fileReader.read(fileData) > 0) {
+				fileData.flip();
+				this.sockTransfert.write(fileData);
+				fileData.clear();
+			}
+
+			fileReader.close();
+			outputFileInformation.close();
+
+			// Process the message to display (thumbnails in the case of images) and notify
+			// the observer
+			Message mUpdate = FileTransferUtils.processMessageToDisplay(this.file);
+			mUpdate.setSender("Moi");
+			this.obsInput.updateInput(this, mUpdate);
+
+		} catch (IOException | MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		} finally {
+			try {
+				this.sockTransfert.close();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+}

POO/src/communication/filetransfer/FileTransferServer.java

@@ -0,0 +1,57 @@
+package communication.filetransfer;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.UnknownHostException;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+
+import observers.ObserverInputMessage;
+
+public class FileTransferServer extends Thread {
+
+	private ServerSocketChannel sockFTListen;
+	private int nbFile;
+	private ObserverInputMessage obsInput;
+
+	/**
+	 * Create a server to transfer one or several files. A new socket and thread is
+	 * created for each file to receive. The files are received one by one to save
+	 * bandwidth and avoid issues.
+	 * 
+	 * @param nbFile 	The number of file to receive.
+	 * @param o      	The observer to notify once a file is fully received.
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public FileTransferServer(int nbFile, ObserverInputMessage o) throws UnknownHostException, IOException {
+		this.sockFTListen = ServerSocketChannel.open();
+		this.sockFTListen.socket().bind(new InetSocketAddress(0));
+		this.nbFile = nbFile;
+		this.obsInput = o;
+	}
+
+	/**
+	 * @return The port binded to the ServerSocketChannel.
+	 */
+	public int getPort() {
+		return this.sockFTListen.socket().getLocalPort();
+	}
+
+	@Override
+	public void run() {
+		try {
+			for (int i = 0; i < this.nbFile; i++) {
+				SocketChannel sock = this.sockFTListen.accept();
+
+				Thread ft = new FileTransferReceivingThread(sock, this.obsInput);
+				ft.start();
+				ft.join();
+			}
+
+			this.sockFTListen.close();
+		} catch (IOException | InterruptedException e) {
+			e.printStackTrace();
+		}
+	}
+}

POO/src/communication/filetransfer/FileTransferUtils.java

@@ -0,0 +1,150 @@
+package communication.filetransfer;
+
+import java.awt.Graphics2D;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.geom.AffineTransform;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.List;
+
+import javax.imageio.ImageIO;
+
+import messages.MessageFichier;
+import messages.MauvaisTypeMessageException;
+import messages.Message.TypeMessage;
+
+public class FileTransferUtils {
+
+	// Relative path of the folder where are put the received files
+	protected static final String DOWNLOADS_RELATIVE_PATH = "../downloads/";
+	protected static final ArrayList<String> IMAGE_EXTENSIONS = new ArrayList<String>(
+			List.of("tif", "tiff", "bmp", "jpg", "jpeg", "gif", "png", "eps", "svg"));
+	protected static final int KB_SIZE = 1024;
+
+	/**
+	 * Process what to display on the chat depending on the file sent/received. A
+	 * thumbnail will be created in the case of an image, A String with the file's
+	 * name will be created otherwise.
+	 * 
+	 * @param file 		The file to process.
+	 * @return A message of which content is either a thumbnail or the file's name.
+	 * @throws IOException
+	 */
+	protected static MessageFichier processMessageToDisplay(File file) throws IOException {
+		String nameFile = file.getName();
+		String extension = processFileExtension(nameFile);
+		TypeMessage type;
+		String contenu;
+
+		if (IMAGE_EXTENSIONS.contains(extension)) {
+			type = TypeMessage.IMAGE;
+			BufferedImage img = ImageIO.read(file);
+			contenu = encodeImage(createThumbnail(img), extension);
+
+		} else {
+			type = TypeMessage.FICHIER;
+			contenu = nameFile;
+		}
+
+		try {
+			return new MessageFichier(type, contenu, extension);
+		} catch (MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	/**
+	 * @param fileName 		The name of the file (with its extension).
+	 * @return The extension of the file.
+	 */
+	protected static String processFileExtension(String fileName) {
+		String extension = "";
+
+		int i = fileName.indexOf('.');
+		if (i >= 0 || i != -1) {
+			extension = fileName.substring(i + 1).toLowerCase();
+		}
+		return extension;
+	}
+
+	/**
+	 * @param image 	A buffered image.
+	 * @return A thumbnail of the image.
+	 */
+	private static BufferedImage createThumbnail(BufferedImage image) {
+		float w = image.getWidth();
+		float ratio = (w > 150) ? (150F / w) : 1;
+		BufferedImage scaled = scale(image, ratio);
+		return scaled;
+	}
+
+	/**
+	 * @param img      		A buffered image.
+	 * @param extension		The extension of the image.
+	 * @return The base64 encoded string corresponding to the given image.
+	 * @throws IOException
+	 */
+	private static String encodeImage(BufferedImage img, String extension) throws IOException {
+		ByteArrayOutputStream bos = new ByteArrayOutputStream();
+		ImageIO.write(img, extension, bos);
+		String imgString = Base64.getEncoder().encodeToString(bos.toByteArray());
+		bos.close();
+		return imgString;
+	}
+
+	/**
+	 * @param imageString 		The base64 encoded string of an image.
+	 * @return A buffered image corresponding to the given base64 encoded string.
+	 * @throws IOException
+	 */
+	public static BufferedImage decodeImage(String imageString) throws IOException {
+		byte[] imgData = Base64.getDecoder().decode(imageString);
+		InputStream is = new ByteArrayInputStream(imgData);
+		BufferedImage img = ImageIO.read(is);
+		is.close();
+		return img;
+	}
+
+	// Used to scale an image with a given ratio
+	private static BufferedImage scale(BufferedImage source, double ratio) {
+		int w = (int) (source.getWidth() * ratio);
+		int h = (int) (source.getHeight() * ratio);
+		BufferedImage bi = getCompatibleImage(w, h);
+		Graphics2D g2d = bi.createGraphics();
+		double xScale = (double) w / source.getWidth();
+		double yScale = (double) h / source.getHeight();
+		AffineTransform at = AffineTransform.getScaleInstance(xScale, yScale);
+		g2d.drawRenderedImage(source, at);
+		g2d.dispose();
+		return bi;
+	}
+
+	private static BufferedImage getCompatibleImage(int w, int h) {
+		GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
+		GraphicsDevice gd = ge.getDefaultScreenDevice();
+		GraphicsConfiguration gc = gd.getDefaultConfiguration();
+		BufferedImage image = gc.createCompatibleImage(w, h);
+		return image;
+	}
+
+	/**
+	 * Create the folder with the path "DOWNLOADS_RELATIVE_PATH" if it does not
+	 * exist.
+	 */
+	public static void createDownloads() {
+		File downloads = new File(FileTransferUtils.DOWNLOADS_RELATIVE_PATH);
+
+		if (!downloads.exists()) {
+			downloads.mkdir();
+		}
+	}
+}

POO/src/communication/tcp/TCPClient.java

@@ -0,0 +1,97 @@
+package communication.tcp;
+
+import java.io.IOException;
+
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+import java.net.Socket;
+
+import observers.ObserverInputMessage;
+import observers.ObserverSocketState;
+
+import messages.Message;
+
+public class TCPClient {
+
+	private Socket sockTCP;
+	private ObjectOutputStream output;
+	private ObjectInputStream input;
+	private TCPInputThread inputThread;
+
+	/**
+	 * Create a TCP client from an existing socket. It will ensure the transmission
+	 * of messages during a session. Two ObjectStream are created in order to
+	 * read/write messages. The ObjectInputStream is given to a thread to read
+	 * continuously the incoming message and allowing the user to write a message
+	 * anytime.
+	 * 
+	 * @param sockTCP
+	 * @throws IOException
+	 */
+	public TCPClient(Socket sockTCP) throws IOException {
+		this.sockTCP = sockTCP;
+
+		this.output = new ObjectOutputStream(sockTCP.getOutputStream());
+		this.input = new ObjectInputStream(sockTCP.getInputStream());
+		this.inputThread = new TCPInputThread(this.input);
+	}
+
+	/**
+	 * Start the thread that will continuously read from the socket.
+	 */
+	public void startInputThread() {
+		this.inputThread.start();
+	}
+
+	/**
+	 * Send a message by writing it in the ObjectOutputStream of the socket
+	 * 
+	 * @param message
+	 * @throws IOException
+	 */
+	public void sendMessage(Message message) throws IOException {
+		this.output.writeObject(message);
+	}
+
+	/**
+	 * Set the observer to notify when a message is received
+	 * 
+	 * @param o 	The observer
+	 */
+	public void setObserverInputThread(ObserverInputMessage o) {
+		this.inputThread.setObserverInputMessage(o);
+	}
+
+	/**
+	 * Set the observer to notify when the session is closed/the communication is
+	 * broken.
+	 * 
+	 * @param o 	The observer
+	 */
+	public void setObserverSocketState(ObserverSocketState o) {
+		this.inputThread.setObserverSocketState(o);
+	}
+
+	/**
+	 * Method used when the session is over. Set all attributes' references to null,
+	 * interrupt the inputThread and close the streams and the socket.
+	 */
+	public void destroyAll() {
+		try {
+			if (!this.sockTCP.isClosed()) {
+				this.inputThread.setObserverSocketState(null);
+				this.inputThread.interrupt();
+				this.input.close();
+				this.output.close();
+				this.sockTCP.close();
+			}
+			this.inputThread = null;
+			this.sockTCP = null;
+			this.output = null;
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+}

POO/src/communication/tcp/TCPInputThread.java

@@ -0,0 +1,77 @@
+package communication.tcp;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import observers.ObserverInputMessage;
+import observers.ObserverSocketState;
+
+public class TCPInputThread extends Thread {
+
+	private ObjectInputStream input;
+	private boolean running;
+	private ObserverInputMessage obsInput;
+	private ObserverSocketState obsState;
+
+	/**
+	 * Create the thread used to read the messages
+	 * 
+	 * @param input 	The ObjectInputStream to read data from
+	 */
+	protected TCPInputThread(ObjectInputStream input) {
+		this.input = input;
+		this.running = true;
+	}
+
+	@Override
+	public void run() {
+
+		while (this.running) {
+			try {
+				Object o = this.input.readObject();
+				// Notify the observer a message was received
+				this.obsInput.updateInput(this, o);
+
+			} catch (IOException | ClassNotFoundException e) {
+				this.interrupt();
+
+			}
+
+		}
+	}
+
+	@Override
+	public void interrupt() {
+		// Stop the thread
+		this.running = false;
+		// Close the stream and the socket
+
+		if (this.obsState != null) {
+			// Send an update to the controller
+			this.obsState.updateSocketState(this, true);
+		}
+
+		// Set every attribute to null so they're collected by the GC
+		this.obsInput = null;
+		this.obsState = null;
+		this.input = null;
+	}
+
+	/**
+	 * Set the observer to notify when a message is received
+	 * 
+	 * @param o 	The observer
+	 */
+	protected void setObserverInputMessage(ObserverInputMessage o) {
+		this.obsInput = o;
+	}
+
+	/**
+	 * Set the observer to notify when the session is cut/closed.
+	 * 
+	 * @param o 	The observer
+	 */
+	protected void setObserverSocketState(ObserverSocketState o) {
+		this.obsState = o;
+	}
+
+}

POO/src/communication/tcp/TCPServer.java

@@ -0,0 +1,52 @@
+package communication.tcp;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+import observers.ObserverInputMessage;
+
+public class TCPServer extends Thread {
+
+	private ServerSocket sockListenTCP;
+	private ObserverInputMessage obsInput;
+
+	/**
+	 * Create a TCP Server on the specified port. It will listen continuously for
+	 * connections in order to create new sessions between users.
+	 * 
+	 * @param port 		The port on which the server will listen
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public TCPServer(int port) throws UnknownHostException, IOException {
+		this.sockListenTCP = new ServerSocket(port, 50, InetAddress.getLocalHost());
+	}
+
+	@Override
+	public void run() {
+		Socket sockAccept;
+		while (true) {
+			try {
+				sockAccept = this.sockListenTCP.accept();
+
+				// Notify the observer of the new connexion
+				this.obsInput.updateInput(this, sockAccept);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+
+		}
+	}
+
+	/**
+	 * Set the observer to notify when a new connection is made.
+	 * 
+	 * @param o 	The observer
+	 */
+	public void addObserver(ObserverInputMessage o) {
+		this.obsInput = o;
+	}
+}

POO/src/communication/udp/CommunicationUDP.java

@@ -0,0 +1,295 @@
+package communication.udp;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+
+import main.Utilisateur;
+
+import messages.*;
+import observers.ObserverUserList;
+
+public class CommunicationUDP extends Thread {
+
+	private UDPClient client;
+	private UDPServer server;
+	private int portServer;
+	private ArrayList<Integer> portOthers;
+	private ArrayList<Utilisateur> users = new ArrayList<Utilisateur>();
+	private ObserverUserList obsList;
+
+	/**
+	 * Create the object that will manage the userlist and contain a UDPClient and a
+	 * UDPServer. Since the applications will run on localhost, it needs to know
+	 * every UDPServer ports used in order to replicate a broadcast behaviour.
+	 * 
+	 * @param portClient 	The port number for the UDPClient
+	 * @param portServer 	The port number for the UDPServer
+	 * @param portsOther 	The port numbers for every other application's UDPServer
+	 * @throws IOException
+	 */
+	public CommunicationUDP(int portClient, int portServer, int[] portsOther) throws IOException {
+		this.portServer = portServer;
+		this.portOthers = this.getArrayListFromArray(portsOther);
+		this.server = new UDPServer(portServer, this);
+		this.server.start();
+		this.client = new UDPClient(portClient);
+	}
+
+	/**
+	 * Create an ArrayList<Integer> from the int[] list of every servers' ports and
+	 * remove the port of this application UDPServer.
+	 * 
+	 * @param ports 	The UDPServer port numbers.
+	 * @return An ArrayList<Integer> without the port of this UDPServer.
+	 */
+	private ArrayList<Integer> getArrayListFromArray(int ports[]) {
+		ArrayList<Integer> tmp = new ArrayList<Integer>();
+		for (int port : ports) {
+			tmp.add(port);
+		}
+		tmp.remove(Integer.valueOf(portServer));
+
+		return tmp;
+	}
+
+	/**
+	 * Set the observer to notify when the userList is updated.
+	 * 
+	 * @param obs 	The observer
+	 */
+	public void setObserver(ObserverUserList o) {
+		this.obsList = o;
+	}
+
+	// -------------- USER LIST UPDATE METHODS -------------- //
+
+	/**
+	 * Add a new user to the userlist and notify the observer.
+	 * 
+	 * @param idClient
+	 * @param pseudoClient
+	 * @param ipClient
+	 * @param port
+	 * @throws UnknownHostException
+	 */
+	protected synchronized void addUser(String idUser, String pseudoUser, InetAddress ipUser, int portTCPServer)
+			throws UnknownHostException {
+		users.add(new Utilisateur(idUser, pseudoUser, ipUser, portTCPServer));
+		this.sendUpdate();
+
+	}
+
+	/**
+	 * Change the pseudo of an user and notify the observer if it exists in the
+	 * userlist. Do nothing otherwise.
+	 * 
+	 * @param idClient
+	 * @param pseudoClient
+	 * @param ipClient
+	 * @param port
+	 */
+	protected synchronized void changePseudoUser(String idUser, String pseudoUser, InetAddress ipUser,
+			int portTCPServer) {
+		int index = getIndexFromID(idUser);
+		if (index != -1) {
+			users.get(index).setPseudo(pseudoUser);
+			this.sendUpdate();
+		}
+
+	}
+
+	/**
+	 * Remove an user from the userlist and notify the observer if it exists in the
+	 * userlist. Do nothing otherwise.
+	 * 
+	 * @param idUser
+	 * @param pseudoUser
+	 * @param ipUser
+	 * @param portTCPServer
+	 */
+	protected synchronized void removeUser(String idUser, String pseudoUser, InetAddress ipUser, int portTCPServer) {
+		int index = getIndexFromID(idUser);
+		if (index != -1) {
+			users.remove(index);
+			this.sendUpdate();
+		}
+
+	}
+
+	public void removeAllUsers() {
+		this.users.clear();
+	}
+
+	// -------------- CHECKERS -------------- //
+
+	/**
+	 * Check if there is an user in the list that has the given id.
+	 * 
+	 * @param id 	The user's id.
+	 * @return True if the user is in the list 
+	 * false otherwise.
+	 */
+	protected boolean containsUserFromID(String id) {
+		for (Utilisateur u : users) {
+			if (u.getId().equals(id)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Check if there is an user in the list that has the given pseudo.
+	 * 
+	 * @param pseudo 	The user's pseudo.
+	 * @return True if the user is in the list 
+	 * false otherwise.
+	 */
+	public boolean containsUserFromPseudo(String pseudo) {
+		for (Utilisateur u : users) {
+			if (u.getPseudo().toLowerCase().equals(pseudo)) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	// -------------- GETTERS -------------- //
+
+	/**
+	 * Return the user with the given pseudo if it exists in the list.
+	 * 
+	 * @param pseudo 	The user's pseudo.
+	 * @return The user if it exists in the list. 
+	 * null otherwise.
+	 */
+	public Utilisateur getUserFromPseudo(String pseudo) {
+		for (int i = 0; i < users.size(); i++) {
+			if (users.get(i).getPseudo().equals(pseudo)) {
+				return users.get(i);
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Return the index of the user with the given id if it exists in the list.
+	 * 
+	 * @param id 	The user's id.
+	 * @return The index if the user exists in the list. 
+	 * null otherwise
+	 */
+	private int getIndexFromID(String id) {
+		for (int i = 0; i < users.size(); i++) {
+			if (users.get(i).getId().equals(id)) {
+				return i;
+			}
+		}
+		return -1;
+	}
+
+	// -------------- SEND MESSAGES METHODS -------------- //
+
+	/**
+	 * Send a message indicating this application's user is connected to every
+	 * UDPServer.
+	 * 
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public void sendMessageConnecte() throws UnknownHostException, IOException {
+
+		try {
+			Message msgOut = new MessageSysteme(Message.TypeMessage.JE_SUIS_CONNECTE);
+			for (int port : this.portOthers) {
+
+				this.client.sendMessageUDP_local(msgOut, port);
+			}
+		} catch (MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Send a message containing this application's user's data to every UDPServer.
+	 * This method is used to first add this user in the userlist or update this
+	 * user's pseudo.
+	 * 
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public void sendMessageInfoPseudo() throws UnknownHostException, IOException {
+
+		Utilisateur self = Utilisateur.getSelf();
+
+		try {
+			Message msgOut = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, self.getPseudo(), self.getId(),
+					self.getPort());
+			for (int port : this.portOthers) {
+				this.client.sendMessageUDP_local(msgOut, port);
+			}
+		} catch (MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+	/**
+	 * Send a message containing this application's user's data to one user. This
+	 * method is used to answer back when receiving a message with the type
+	 * "JE_SUIS_CONNECTE"
+	 * 
+	 * @param portOther 	The port on which the other user's UDPServer is listening
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public void sendMessageInfoPseudo(int portOther) throws UnknownHostException, IOException {
+
+		Utilisateur self = Utilisateur.getSelf();
+		try {
+			Message msgOut = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, self.getPseudo(), self.getId(),
+					self.getPort());
+			this.client.sendMessageUDP_local(msgOut, portOther);
+		} catch (MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Send a message indicating this application's user is disconnected to every
+	 * UDPServer.
+	 * 
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public void sendMessageDelete() throws UnknownHostException, IOException {
+		Utilisateur self = Utilisateur.getSelf();
+		try {
+
+			Message msgOut = new MessageSysteme(Message.TypeMessage.JE_SUIS_DECONNECTE, self.getPseudo(), self.getId(),
+					self.getPort());
+			for (int port : this.portOthers) {
+				this.client.sendMessageUDP_local(msgOut, port);
+			}
+
+		} catch (MauvaisTypeMessageException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	
+	// -------------- OTHERS -------------- //
+
+	/**
+	 * Notify the observer with the updated list
+	 */
+	private void sendUpdate() {
+		if (this.obsList != null) {
+			this.obsList.updateList(this, users);
+		}
+	}
+
+}

POO/src/communication/udp/UDPClient.java

@@ -0,0 +1,55 @@
+package communication.udp;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import messages.*;
+
+class UDPClient {
+
+	private DatagramSocket sockUDP;
+
+	/**
+	 * Create an UDP client on the specified port. It will be used to notify the
+	 * other users of this application's user state (Connected/Disconnected/Pseudo
+	 * changed).
+	 * 
+	 * @param port
+	 * @throws SocketException
+	 * @throws UnknownHostException
+	 */
+	public UDPClient(int port) throws SocketException, UnknownHostException {
+		this.sockUDP = new DatagramSocket(port);
+	}
+
+	/**
+	 * Send a message to the specified port on localhost.
+	 * 
+	 * @param message
+	 * @param port
+	 * @throws IOException
+	 */
+	protected void sendMessageUDP_local(Message message, int port) throws IOException {
+		sendMessageUDP(message, port, InetAddress.getLocalHost());
+	}
+
+	/**
+	 * Send a message to the given address on the specified port.
+	 * 
+	 * @param message
+	 * @param port
+	 * @param clientAddress
+	 * @throws IOException
+	 */
+	private void sendMessageUDP(Message message, int port, InetAddress clientAddress) throws IOException {
+		String messageString = message.toString();
+		DatagramPacket outpacket = new DatagramPacket(messageString.getBytes(), messageString.length(), clientAddress,
+				port);
+		this.sockUDP.send(outpacket);
+	}
+
+}

POO/src/communication/udp/UDPServer.java

@@ -0,0 +1,99 @@
+package communication.udp;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.SocketException;
+
+import main.Utilisateur;
+import messages.*;
+
+class UDPServer extends Thread {
+
+	private DatagramSocket sockUDP;
+	private CommunicationUDP commUDP;
+	private byte[] buffer;
+	private boolean running;
+
+	
+	/**
+	 * Create an UDP Server on the specified port. It will be used to read the
+	 * other users states (Connected/Disconnected/Pseudo).
+	 * 
+	 * @param port
+	 * @param commUDP
+	 * @throws SocketException
+	 */
+	public UDPServer(int port, CommunicationUDP commUDP) throws SocketException {
+		this.running = true;
+		this.commUDP = commUDP;
+		this.sockUDP = new DatagramSocket(port);
+		this.buffer = new byte[256];
+	}
+
+	@Override
+	public void run() {
+		while (this.running) {
+			try {
+				
+				//When a datagram is received, converts its data in a Message
+				DatagramPacket inPacket = new DatagramPacket(buffer, buffer.length);
+				this.sockUDP.receive(inPacket);
+				String msgString = new String(inPacket.getData(), 0, inPacket.getLength());
+				Message msg = Message.stringToMessage(msgString);
+				
+				//Depending on the type of the message
+				switch (msg.getTypeMessage()) {
+				case JE_SUIS_CONNECTE:
+
+					if (Utilisateur.getSelf() != null) {
+						
+						int portClient = inPacket.getPort();
+						int portServer = portClient+1;
+						
+						//Answer back with this application's user data
+						this.commUDP.sendMessageInfoPseudo(portServer);
+					}
+
+					break;
+
+				case INFO_PSEUDO:
+					
+					MessageSysteme m = (MessageSysteme) msg;
+					
+					//Update the userlist with the data received (Add the user or update it)
+					if (this.commUDP.containsUserFromID(m.getId())) {
+						this.commUDP.changePseudoUser(m.getId(), m.getPseudo(), inPacket.getAddress(), m.getPort());
+					} else {
+						this.commUDP.addUser(m.getId(), m.getPseudo(), inPacket.getAddress(), m.getPort());
+					}
+					break;
+
+				case JE_SUIS_DECONNECTE:
+					
+					MessageSysteme m2 = (MessageSysteme) msg;
+					//Remove the user from the userlist
+					this.commUDP.removeUser(m2.getId(), m2.getPseudo(), inPacket.getAddress(), m2.getPort());
+					break;
+
+				//Do nothing
+				default: 
+				}
+
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+
+		}
+	}
+
+	@Override
+	public void interrupt() {
+		// Stop the thread
+		this.running = false;
+		// Close the stream and the socket
+		this.sockUDP.close();
+		this.buffer = null;
+		this.commUDP = null;
+	}
+}

POO/src/connexion/ControleurConnexion.java

@@ -0,0 +1,179 @@
+package connexion;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.IOException;
+import java.net.UnknownHostException;
+import java.sql.SQLException;
+
+import communication.udp.CommunicationUDP;
+import database.SQLiteManager;
+import main.Utilisateur;
+import standard.VueStandard;
+
+public class ControleurConnexion implements ActionListener{
+
+	//Controller state : either DEBUT at initialization or ID_OK if the user has signed in
+	private enum Etat {DEBUT, ID_OK};
+	
+	private VueConnexion vue;
+	private Etat etat;
+	private CommunicationUDP comUDP;
+	private int portTCP;
+	private String username;
+	private SQLiteManager sqlManager;
+	private VueStandard vueStd;
+	
+
+	/**
+	 * Create and initialize the object in charge of monitoring all actions depending on what the user do.
+	 * 
+	 * @param vue : associated instance of VueConnexion
+	 * @param numtest : on local mode, allows you to choose which port to use. Integer between 0 and 3
+	 * 
+	 */
+	public ControleurConnexion(VueConnexion vue, int numtest) {
+		this.vue = vue;
+		this.etat = Etat.DEBUT;
+		this.username = "";
+		this.sqlManager = new SQLiteManager(0);
+		this.vueStd = null;
+		
+		int[] portServer = {2209, 2309, 2409, 2509, 3334};
+		try {
+			switch(numtest) {
+			case 0 : 
+				this.comUDP = new CommunicationUDP(2208, 2209, portServer);
+				this.portTCP = 7010;
+				break;
+			case 1 :
+				this.comUDP = new CommunicationUDP(2308, 2309, portServer);
+				this.portTCP = 7020;
+				break;
+			case 2 :
+				this.comUDP = new CommunicationUDP(2408, 2409, portServer);
+				this.portTCP = 7030;
+				break;
+			case 3 :
+				this.comUDP = new CommunicationUDP(2508, 2509, portServer);
+				this.portTCP = 7040;
+				break;
+			default :
+				this.comUDP = new CommunicationUDP(2408, 2409, portServer);
+				this.portTCP = 7040;
+			}			
+			
+		} catch (IOException e) {
+		}
+	}
+	
+	
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		String pseudo;
+		boolean inputOK = false;
+		if (this.etat == Etat.DEBUT) {
+			
+			this.username = this.vue.getUsernameValue();
+			char[] password = this.vue.getPasswordValue();
+			
+			try {
+				int res = this.sqlManager.checkPwd(this.username, password);
+				inputOK = (res == 1);
+	
+			} catch (SQLException e2) {
+			}
+			
+			
+			if (inputOK) {
+				this.etat=Etat.ID_OK;
+
+				//Broadcast "JE_SUIS_CONNECTE" message and waits for the other devices' answers
+				try {
+					comUDP.sendMessageConnecte();
+				} catch (IOException e2) {
+				}
+			
+				try {
+					Thread.sleep(2);
+				} catch (InterruptedException e1) {
+				}
+				
+				//setup pseudo ask
+				this.vue.setConnexionInfo("");
+				this.vue.removePasswordPanel();
+				
+				this.vue.setTextUsernameField("Veuillez entrer votre pseudonyme");
+				this.vue.resetUsernameField();
+				inputOK=false;
+			}
+			else {
+				this.vue.setConnexionInfo("Identifiant ou mot de passe invalide, veuillez réessayer");
+				this.vue.resetPasswordField();
+			}
+			
+		}
+		else {
+			pseudo = vue.getUsernameValue();
+			
+			//Search in the local list of active users id the chosen pseudo is already in use 
+			inputOK = !this.comUDP.containsUserFromPseudo(pseudo);
+			if(pseudo.equals("")) {
+				this.vue.setConnexionInfo("Votre pseudonyme doit contenir au moins 1 caratère");
+			}else if (inputOK) {
+				//setup Utilisateur "self" static attribute
+				try {
+					Utilisateur.setSelf(this.username, pseudo, "localhost", this.portTCP);
+				} catch (UnknownHostException e2) {
+				}
+				
+				//broadcast new pseudo
+				try {
+					this.comUDP.sendMessageInfoPseudo();
+				} catch (UnknownHostException e1) {
+				} catch (IOException e1) {
+				}
+					
+				try {
+					this.resetView();
+					this.vue.setVisible(false);
+					this.setVueStandard();
+				} catch (IOException e1) {
+				}
+			}
+			else this.vue.setConnexionInfo("Ce nom est déjà utilisé, veuillez en choisir un autre");
+		}
+	}
+
+	
+	// ----- SETTING & RESETTING VIEW ----- //
+	
+	/**
+	 * Create a new VueStandard instance and give it the hand.
+	 * 
+	 */
+	private void setVueStandard() throws IOException {
+		if(this.vueStd == null) {
+			this.vueStd = new VueStandard("Standard", this.comUDP, this.portTCP, this.sqlManager, this.vue);
+			
+		}else {
+			this.vueStd.initControleur();
+			this.vueStd.setPseudoSelf();
+			this.vueStd.setVisible(true);
+		}
+	}
+
+	/**
+	 * Restore the associated instance of VueConnexion to its initial state
+	 * 
+	 */
+	private void resetView() {
+		this.etat = Etat.DEBUT;
+		this.vue.addPasswordPanel();
+		this.vue.resetPasswordField();
+		this.vue.resetUsernameField();
+		this.vue.setTextUsernameField("Nom d'utilisateur");
+		this.vue.setConnexionInfo("");
+		
+	}
+}

POO/src/connexion/VueConnexion.java

@@ -0,0 +1,171 @@
+package connexion;
+
+//Import librairies
+import java.awt.*;
+import javax.swing.*;
+
+import database.SQLiteManager;
+import main.Vue;
+
+public class VueConnexion extends Vue {
+	
+	private static final long serialVersionUID = 1L;
+	
+	//Graphical elements
+	private JButton boutonValider;
+	private JTextField inputUsername;
+	private JPasswordField inputPassword;
+	private JLabel labelUsername;
+	private JLabel labelPassword;
+	private JLabel connexionInfo;
+	private JPanel main;
+	private JPanel panelPassword;
+
+	//Controller
+	private ControleurConnexion controle;
+	
+	/**
+	 * Create and initialize the view SWING window that will be used during the connection phase.
+	 * Doing so, it also creates the controller that will monitor all changes during the connection phase.
+	 * 
+	 * @param numtest : to be passed down to the controller
+	 * 
+	 */
+	public VueConnexion(int numtest) {
+		super("Connexion");
+		controle = new ControleurConnexion(this, numtest);
+		
+		//Window creation
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		this.setSize(400, 300);
+		this.setLocationRelativeTo(null);
+		
+		//Adding graphical elements
+		ajouterElements();
+		
+		//Setting default button
+		this.getRootPane().setDefaultButton(boutonValider);
+		
+		this.inputUsername.setText(SQLiteManager.hardcodedNames[numtest]+numtest);
+		this.inputPassword.setText("aze1$"+SQLiteManager.hardcodedNames[numtest].charAt(0)+numtest);
+		
+		//Display window
+		this.setVisible(true);
+	}
+	
+	
+	// ----- ADDING ELEMENTS TO AND REMOVING ELEMENTS FROM THE MAIN WINDOW ----- //
+	
+	
+	/**
+	 * Add various graphical elements to the main window : used when initializing the window
+	 */
+	private void ajouterElements() {
+		
+		//Create a panel
+		main = new JPanel(new GridLayout(4,1));		
+		JPanel panelUsername = new JPanel(new GridLayout(1, 2));
+		this.panelPassword = new JPanel(new GridLayout(1, 2));
+		
+		//Create various elements
+		this.connexionInfo = new JLabel("");
+		
+		this.inputUsername = new JTextField();
+		this.inputUsername.setPreferredSize(new Dimension(100, 50));
+		
+		this.labelUsername = new JLabel("Nom d'utilisateur");	
+		this.labelUsername.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
+		
+		this.inputPassword = new JPasswordField();
+		this.inputPassword.setPreferredSize(new Dimension(100, 50));
+		
+		this.labelPassword = new JLabel("Mot de passe :");
+		this.labelPassword.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
+		
+		boutonValider = new JButton("Valider");
+		
+		//Make it so the controller is monitoring the button
+		boutonValider.addActionListener(controle);
+		
+		
+		panelUsername.add(this.labelUsername);
+		panelUsername.add(this.inputUsername);
+		
+		
+		this.panelPassword.add(this.labelPassword);
+		this.panelPassword.add(this.inputPassword);
+		
+		
+		main.add(connexionInfo);
+		main.add(panelUsername);
+		main.add(this.panelPassword);
+		main.add(boutonValider);
+		
+		this.add(main);
+	}
+	
+	protected void removePasswordPanel() {
+		this.main.remove(2);
+	}
+	
+	protected void addPasswordPanel() {
+		this.main.add(this.panelPassword, 2);
+	}
+
+	
+	//----- GETTERS -----//
+	
+	/**
+	 * Returns the current value of the field inputUsername
+	 * 
+	 * @return current value of the field inputUsername as String
+	 */
+	protected String getUsernameValue() {
+		return this.inputUsername.getText();
+	}
+	
+	/**
+	 * Returns the current value of the field inputPassword
+	 * 
+	 * @return current value of the field inputPassword as String
+	 */
+	protected char[] getPasswordValue() {
+		return this.inputPassword.getPassword();
+	}
+	
+	
+	//----- SETTERS -----//
+	
+	/**
+	 * Set a displayed message that will give the user information (for example if they entered a wrong password)
+	 * 
+	 * @param text : message to display as String
+	 */
+	protected void setConnexionInfo(String text) {
+		this.connexionInfo.setText(text);
+	}
+	
+	/**
+	 * Set the label for the inputUsername fiel
+	 * 
+	 * @param text : label to display as String
+	 */
+	protected void setTextUsernameField(String text) {
+		this.labelUsername.setText(text);
+	}
+	
+	/**
+	 * Empty the inputUsername text field
+	 */
+	protected void resetUsernameField() {
+		this.inputUsername.setText("");
+	}
+	
+	/**
+	 * Empty the inputPassword text field
+	 */
+	protected void resetPasswordField() {
+		this.inputPassword.setText("");
+	}
+	
+}

POO/src/database/SQLiteCreateTables.java

@@ -0,0 +1,117 @@
+package database;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+class SQLiteCreateTables {
+
+	/**
+	 * Create the user table if it does not exist in the database.
+	 * An user is characterized by :
+	 * - an unique username, 
+	 * - a password salt,
+	 * - a database_key salt,
+	 * - a password hash encrypted by the database_key,
+	 * - the encrypted database_key,
+	 * - the initialization vector used to encrypt the database key.
+	 * 
+	 * @param connec 	The opened connection to the database.
+	 * @throws SQLException
+	 */
+	protected static void createTableUser(Connection connec) throws SQLException {
+		String createTableUser = "CREATE TABLE IF NOT EXISTS user (\r\n"
+				+ "    id                     INTEGER       PRIMARY KEY AUTOINCREMENT,\r\n"
+				+ "    username               VARCHAR (50) NOT NULL\r\n"
+				+ "                                      UNIQUE ON CONFLICT ROLLBACK,\r\n"
+				+ "    pwd_salt               BLOB,\r\n" 
+				+ "    db_datakey_salt        BLOB,\r\n"
+				+ "    encrypted_pwd_hashsalt BLOB,\r\n" 
+				+ "    encrypted_db_datakey   BLOB,\r\n"
+				+ "    iv_datakey             BLOB\r\n" + ");";
+
+		Statement stmt = connec.createStatement();
+		stmt.execute(createTableUser);
+
+	}
+
+	/**
+	 * Create the conversation table if it does not exist in the database.
+	 * A conversation is characterized by :
+	 * - the id of the user who sends the messages,
+	 * - the id of the user who receives the messages,
+	 * - an initialization vector used to encrypt the conversation's messages.
+	 * 
+	 * During an session between two users, two conversations are created.
+	 * 
+	 * @param connec 	The opened connection to the database.
+	 * @throws SQLException
+	 */
+	protected static void createTableConversation(Connection connec) throws SQLException {
+		String createTableConversation = "CREATE TABLE IF NOT EXISTS conversation (\r\n"
+				+ "    id_conversation INTEGER PRIMARY KEY AUTOINCREMENT,\r\n"
+				+ "    id_sender     INTEGER REFERENCES user (id) \r\n" + "                            NOT NULL,\r\n"
+				+ "    id_receiver    INTEGER REFERENCES user (id) \r\n" + "                            NOT NULL,\r\n"
+				+ "    iv_conversation BLOB NOT NULL" + ");";
+
+		Statement stmt = connec.createStatement();
+		stmt.execute(createTableConversation);
+
+	}
+
+	/**
+	 * Create the message table if it does not exist in the database.
+	 * A message is characterized by :
+	 * - the id of the conversation it belongs,
+	 * - the id of its type,
+	 * - its content,
+	 * - the date when it was emitted,
+	 * - its extension if it is a file (text or image).
+	 * 
+	 * @param connec 	The opened connection to the database.
+	 * @throws SQLException
+	 */
+	protected static void createTableMessage(Connection connec) throws SQLException {
+		String createTableMessage = "CREATE TABLE IF NOT EXISTS message (\r\n"
+				+ "    id_message      INTEGER      PRIMARY KEY AUTOINCREMENT,\r\n"
+				+ "    id_conversation INTEGER      REFERENCES conversation (id_conversation) \r\n"
+				+ "                                 NOT NULL,\r\n"
+				+ "    id_type         INTEGER      REFERENCES type (id_type) \r\n"
+				+ "                                 NOT NULL,\r\n" 
+				+ "    content         BLOB,\r\n"
+				+ "    date            INTEGER      NOT NULL,\r\n" 
+				+ "    extension       VARCHAR (20) \r\n" + ");\r\n";
+
+		Statement stmt = connec.createStatement();
+		stmt.execute(createTableMessage);
+	}
+
+	/**
+	 * Create the (message) type table if it does not exist and insert the different
+	 * types of message in the database.
+	 * A type is characterized by :
+	 * - a label.
+	 * 
+	 * This table only exists because the type "enumeration" does not exist in SQLite.
+	 * It is a static table that contains the different types of message stored in the database.
+	 * 
+	 * @param connec 	The opened connection to the database.
+	 * @throws SQLException
+	 */
+	protected static void createTableType(Connection connec) throws SQLException {
+		String createTableType = "CREATE TABLE IF NOT EXISTS type (\r\n" 
+				+ "    id_type INTEGER      PRIMARY KEY,\r\n"
+				+ "    label VARCHAR (20) NOT NULL\r\n" + ");";
+
+		Statement stmt = connec.createStatement();
+		stmt.execute(createTableType);
+
+		String typeText = "INSERT OR IGNORE INTO type (id_type, label) " + "VALUES (0, 'text');";
+		String typeFile = "INSERT OR IGNORE INTO type (id_type, label) " + "VALUES (1, 'file');";
+		String typeImage = "INSERT OR IGNORE INTO type (id_type, label) " + "VALUES (2, 'image');";
+
+		stmt.execute(typeText);
+		stmt.execute(typeFile);
+		stmt.execute(typeImage);
+	}
+}

POO/src/database/SQLiteEncryption.java

@@ -0,0 +1,158 @@
+package database;
+
+import java.util.Base64;
+import java.util.Random;
+
+import javax.crypto.*;
+import javax.crypto.spec.*;
+import java.security.*;
+import java.security.spec.*;
+
+class SQLiteEncryption {
+
+	private static final Random RANDOM = new SecureRandom();
+	private static final int ITERATIONS = 10000;
+	private static final int KEY_LENGTH = 256;
+	protected static final String encryptAlgorithm = "AES/CBC/PKCS5Padding";
+
+	/**
+	 * Return a 24 bytes salt.
+	 * 
+	 * @return The salt in a byte array.
+	 */
+	protected static byte[] getNextSalt() {
+		byte[] salt = new byte[24];
+		RANDOM.nextBytes(salt);
+		return salt;
+	}
+
+	/**
+	 * Return the hash of the given password with the given salt.
+	 * 
+	 * @param password
+	 * @param salt
+	 * @return The hash in a byte array.
+	 */
+	protected static byte[] hash(char[] password, byte[] salt) {
+		return SQLiteEncryption.getKey(password, salt).getEncoded();
+	}
+
+	/**
+	 * Return a secret key generated with the given password and salt.
+	 * 
+	 * @param password
+	 * @param salt
+	 * @return The secret key.
+	 */
+	protected static SecretKey getKey(char[] password, byte[] salt) {
+		PBEKeySpec saltpwd = new PBEKeySpec(password, salt, ITERATIONS, KEY_LENGTH);
+
+		try {
+			SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
+			SecretKey tmp = skf.generateSecret(saltpwd);
+			SecretKey key = new SecretKeySpec(tmp.getEncoded(), "AES");
+			return key;
+		} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		} finally {
+			saltpwd.clearPassword();
+		}
+		return null;
+	}
+
+	/**
+	 * Return a 16 bytes Initialization vector.
+	 * 
+	 * @return The Initialization vector.
+	 */
+	protected static IvParameterSpec generateIv() {
+		byte[] iv = new byte[16];
+		RANDOM.nextBytes(iv);
+		return new IvParameterSpec(iv);
+	}
+
+	/**
+	 * Encrypt the given input (byte array) with the given algorithm, secretKey and
+	 * initialization vector.
+	 * 
+	 * 
+	 * @param algorithm
+	 * @param input
+	 * @param key
+	 * @param iv
+	 * @return The encrypted input in a byte array.
+	 * 
+	 * @throws NoSuchAlgorithmException
+	 * @throws NoSuchPaddingException
+	 * @throws InvalidKeyException
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws IllegalBlockSizeException
+	 * @throws BadPaddingException
+	 */
+	protected static byte[] encrypt(String algorithm, byte[] input, SecretKey key, IvParameterSpec iv)
+			throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
+			InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
+		Cipher cipher = Cipher.getInstance(algorithm);
+		cipher.init(Cipher.ENCRYPT_MODE, key, iv);
+		byte[] cipherText = cipher.doFinal(input);
+		return Base64.getEncoder().encode(cipherText);
+	}
+
+	/**
+	 * Decrypt the given input (byte array) with the given algorithm, secretKey and
+	 * initialization vector.
+	 * 
+	 * @param algorithm
+	 * @param input
+	 * @param key
+	 * @param iv
+	 * @return The decrypted input in a byte array.
+	 * 
+	 * @throws NoSuchAlgorithmException
+	 * @throws NoSuchPaddingException
+	 * @throws InvalidKeyException
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws IllegalBlockSizeException
+	 * @throws BadPaddingException
+	 */
+	protected static byte[] decryptByte(String algorithm, byte[] input, SecretKey key, IvParameterSpec iv)
+			throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
+			InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
+		Cipher cipher = Cipher.getInstance(algorithm);
+		cipher.init(Cipher.DECRYPT_MODE, key, iv);
+		byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(input));
+		return plainText;
+	}
+
+	/**
+	 * Decrypt the given input (byte array) with the given algorithm, secretKey and
+	 * initialization vector.
+	 * 
+	 * @param algorithm
+	 * @param input
+	 * @param key
+	 * @param iv
+	 * @return The decrypted input as a String.
+	 * 
+	 * @throws InvalidKeyException
+	 * @throws NoSuchAlgorithmException
+	 * @throws NoSuchPaddingException
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws IllegalBlockSizeException
+	 * @throws BadPaddingException
+	 */
+	protected static String decryptString(String algorithm, byte[] input, SecretKey key, IvParameterSpec iv)
+			throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException,
+			InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
+		return new String(SQLiteEncryption.decryptByte(algorithm, input, key, iv));
+	}
+
+	protected static byte[] keyToByte(SecretKey key) {
+		return Base64.getEncoder().encode(key.getEncoded());
+	}
+
+	protected static SecretKey byteToKey(byte[] encodedKey) {
+		byte[] decodedKey = Base64.getDecoder().decode(encodedKey);
+		return new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
+	}
+}

POO/src/database/SQLiteManager.java

@@ -0,0 +1,760 @@
+package database;
+
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.KeyGenerator;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
+
+import main.Utilisateur;
+import messages.MauvaisTypeMessageException;
+import messages.Message;
+import messages.MessageTexte;
+import messages.Message.TypeMessage;
+import messages.MessageFichier;
+
+public class SQLiteManager {
+
+	private static final String DATABASE_RELATIVE_PATH = "../database";
+
+	public static String[] hardcodedNames = { "Olivia", "Liam", "Benjamin", "Sophia", "Charlotte", "Noah", "Elijah",
+			"Isabella", "Oliver", "Emma", "William", "Amelia", "Evelyn", "James", "Mia", "Ava", "Lucas", "Mason",
+			"Ethan", "Harper" };
+
+	private Connection connec;
+	private int numDatabase;
+	private SecretKey dbDataKey;
+
+	
+	/**
+	 * Create the object that will interact with the database. Each time a
+	 * SQLiteManager is created, it creates the tables for the application to work
+	 * if they do not exist already. In the context of a local usage of the
+	 * application, this constructor takes a number that is used to manage different
+	 * database's files (see openConnection() ).
+	 * 
+	 * @param numDatabase
+	 */
+	public SQLiteManager(int numDatabase) {
+		this.numDatabase = numDatabase;
+
+		this.openConnection();
+
+		try {
+
+			SQLiteCreateTables.createTableUser(this.connec);
+			SQLiteCreateTables.createTableConversation(this.connec);
+			SQLiteCreateTables.createTableType(this.connec);
+			SQLiteCreateTables.createTableMessage(this.connec);
+
+		} catch (SQLException e) {
+			this.closeConnection();
+			e.printStackTrace();
+		}
+
+		this.closeConnection();
+	}
+
+	
+	// -------------- CONNECTION METHODS -------------- //
+	
+	/**
+	 * Open a connection to the file DATABASE_RELATIVE_PATH+this.numDatabase+".db"
+	 */
+	private void openConnection() {
+		String url = "jdbc:sqlite:" + DATABASE_RELATIVE_PATH + this.numDatabase + ".db";
+		try {
+			this.connec = DriverManager.getConnection(url);
+		} catch (SQLException e) {
+			System.out.println(e.getMessage());
+		}
+	}
+
+	
+	/**
+	 * Close this object connection, if it exists
+	 */
+	private void closeConnection() {
+		try {
+			if (this.connec != null) {
+				this.connec.close();
+			}
+		} catch (SQLException e) {
+			System.out.println(e.getMessage());
+		}
+
+	}
+
+	
+	// -------------- INSERT METHODS -------------- //
+
+	/**
+	 * Insert a collection of message in the database. They all correspond to the
+	 * conversation between the sender and the receiver. The users and conversations
+	 * are inserted in the database if they do not exist when this method is called.
+	 * 
+	 * @param messages
+	 * @param usernameSender
+	 * @param usernameReceiver
+	 * @return The number of messages inserted
+	 * @throws SQLException
+	 */
+	public int insertAllMessages(ArrayList<Message> messages, String usernameSender, String usernameReceiver)
+			throws SQLException {
+		int nbRows = 0;
+		this.openConnection();
+
+		int idSender = this.getIDUser(usernameSender);
+		int idReceiver = this.getIDUser(usernameReceiver);
+
+		if (idSender == -1) {
+			this.insertUser(usernameSender);
+			idSender = this.getIDUser(usernameSender);
+		}
+
+		if (idReceiver == -1) {
+			this.insertUser(usernameReceiver);
+			idReceiver = this.getIDUser(usernameReceiver);
+		}
+
+		int idConversation = getIDConversation(idSender, idReceiver);
+
+		if (idConversation == -1) {
+			this.insertConversation(idSender, idReceiver);
+			idConversation = getIDConversation(idSender, idReceiver);
+		}
+
+		IvParameterSpec ivConversation = this.getIvConversation(idConversation);
+
+		// Disable autocommit to efficiently insert all the messages.
+		this.connec.setAutoCommit(false);
+
+		for (Message m : messages) {
+			try {
+				nbRows += this.insertMessage(idConversation, m, ivConversation);
+			} catch (SQLException e) {
+				e.printStackTrace();
+				this.connec.rollback();
+			}
+		}
+
+		// Commit once all the messages are inserted
+		this.connec.commit();
+
+		this.closeConnection();
+
+		return nbRows;
+	}
+
+	
+	/**
+	 * Insert a message corresponding to a given conversation (respresented by its
+	 * id). The message content is first encrypted with the database key and the
+	 * given iv.
+	 * 
+	 * @param idConversation
+	 * @param m
+	 * @param iv
+	 * @return The number of rows inserted (it should be 1).
+	 * @throws SQLException
+	 */
+	private int insertMessage(int idConversation, Message m, IvParameterSpec iv) throws SQLException {
+
+		String dateMessage = m.getDateMessage();
+		String extension = this.processExtension(m);
+		String type = this.processMessageType(m);
+		int idType = this.getIDType(type);
+
+		byte[] content = null;
+
+		try {
+			content = this.stringToBytesContent(m, iv);
+		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
+				| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
+
+			e.printStackTrace();
+		}
+
+		String insertMessageRequest = "INSERT INTO message(id_conversation, id_type, content, date, extension) "
+				+ "VALUES (?, ?, ?, ?, ?);";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(insertMessageRequest);
+		prepStmt.setInt(1, idConversation);
+		prepStmt.setInt(2, idType);
+		prepStmt.setBytes(3, content);
+		prepStmt.setString(4, dateMessage);
+		prepStmt.setString(5, extension);
+
+		int nbRows = prepStmt.executeUpdate();
+
+		return nbRows;
+	}
+
+	
+	/**
+	 * Insert an user in the database with only its username.
+	 * 
+	 * @param username
+	 * @throws SQLException
+	 */
+	private void insertUser(String username) throws SQLException {
+		String insertUserRequest = "INSERT INTO user (username) " + "VALUES (?);";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(insertUserRequest);
+		prepStmt.setString(1, username);
+		prepStmt.executeUpdate();
+	}
+
+	
+	/**
+	 * Insert the two conversations corresponding to a session between two users
+	 * (they both can be sender and receiver).
+	 * 
+	 * @param idUser1
+	 * @param idUser2
+	 * @throws SQLException
+	 */
+	private void insertConversation(int idUser1, int idUser2) throws SQLException {
+		String insertConversationRequest = "INSERT INTO conversation (id_sender, id_receiver, iv_conversation) "
+				+ "VALUES " + "(?, ?, ?)," + "(?, ?, ?);";
+
+		byte[] ivConversation = SQLiteEncryption.generateIv().getIV();
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(insertConversationRequest);
+		prepStmt.setInt(1, idUser1);
+		prepStmt.setInt(2, idUser2);
+		prepStmt.setBytes(3, ivConversation);
+		prepStmt.setInt(4, idUser2);
+		prepStmt.setInt(5, idUser1);
+		prepStmt.setBytes(6, ivConversation);
+
+		prepStmt.executeUpdate();
+	}
+
+	
+	// -------------- GET METHODS -------------- //
+
+	/**
+	 * Get the message record between two users. In context, it only needs the
+	 * username and the id of the other user since we can get this application's
+	 * user's data with Utilisateur.getSelf().
+	 * 
+	 * @param usernameOther
+	 * @param pseudoOther
+	 * @return the messages previously exchanged in chronological order or null if
+	 *         there is none.
+	 * @throws SQLException
+	 */
+	public ArrayList<Message> getMessageRecord(String usernameOther, String pseudoOther) throws SQLException {
+
+		this.openConnection();
+
+		ArrayList<Message> messages = new ArrayList<Message>();
+
+		String usernameSelf = Utilisateur.getSelf().getId();
+
+		// Get the ids from the usernames
+		int idSelf = this.getIDUser(usernameSelf);
+		int idOther = this.getIDUser(usernameOther);
+
+		// Get the two conversations corresponding to the exchanges between the two
+		// users
+		int idConversationSelf = this.getIDConversation(idSelf, idOther);
+		int idConversationOther = this.getIDConversation(idOther, idSelf);
+		IvParameterSpec ivConversation = this.getIvConversation(idConversationSelf);
+
+		// Get all the messages
+		String getHistoriqueRequest = "SELECT id_conversation, id_type, content, date, extension " + "FROM message "
+				+ "WHERE id_conversation IN (?,?) " + "ORDER by date";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getHistoriqueRequest);
+		prepStmt.setInt(1, idConversationSelf);
+		prepStmt.setInt(2, idConversationOther);
+		ResultSet res = prepStmt.executeQuery();
+
+		// Process the messages one by one
+		// Create the appropriate message object depending on the type and
+		// sender/receiver
+		// and add the message in the list
+		while (res.next()) {
+			int idType = res.getInt("id_type");
+			String type = this.getType(idType);
+
+			String content = null;
+			try {
+				// Decrypt the message's content with the database key and the conversation's
+				// iv.
+				content = this.bytesToStringContent(res.getBytes("content"), ivConversation);
+			} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
+					| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException
+					| SQLException e1) {
+			}
+
+			Message message = null;
+			String extension;
+
+			if (!type.equals("")) {
+				try {
+					switch (type) {
+					case "text":
+						message = new MessageTexte(TypeMessage.TEXTE, content);
+						break;
+					case "file":
+						extension = res.getString("extension");
+						message = new MessageFichier(TypeMessage.FICHIER, content, extension);
+						break;
+					default:
+						extension = res.getString("extension");
+						message = new MessageFichier(TypeMessage.IMAGE, content, extension);
+					}
+
+				} catch (MauvaisTypeMessageException e) {
+					e.printStackTrace();
+				}
+			}
+
+			if (res.getInt("id_conversation") == idConversationSelf) {
+				message.setSender("Moi");
+			} else {
+				message.setSender(pseudoOther);
+			}
+			message.setDateMessage(res.getString("date"));
+			if (content != null) {
+				messages.add(message);
+			}
+
+		}
+
+		this.closeConnection();
+
+		return messages;
+	}
+
+	
+	/**
+	 * Return the id of the user with the given username if it exists in the
+	 * database.
+	 * 
+	 * @param username
+	 * @return The id of the user or -1 if he does not exist in the database.
+	 * @throws SQLException
+	 */
+	private int getIDUser(String username) throws SQLException {
+		String getIDRequest = "SELECT id " + " FROM user" + " WHERE username = ? ;";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getIDRequest);
+		prepStmt.setString(1, username);
+		ResultSet res = prepStmt.executeQuery();
+
+		if (res.next()) {
+			return res.getInt("id");
+		}
+		return -1;
+
+	}
+
+	
+	/**
+	 * Get the id of the conversation between two users (represented by their ids).
+	 * 
+	 * @param idSender
+	 * @param idReceiver
+	 * @return The id of the conversation or -1 if the conversation does not exists
+	 *         in the database.
+	 * @throws SQLException
+	 */
+	private int getIDConversation(int idSender, int idReceiver) throws SQLException {
+		String getIDRequest = "SELECT id_conversation " + "FROM conversation " + "WHERE id_sender = ? "
+				+ "AND id_receiver = ? ;";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getIDRequest);
+		prepStmt.setInt(1, idSender);
+		prepStmt.setInt(2, idReceiver);
+		ResultSet res = prepStmt.executeQuery();
+
+		if (res.next()) {
+			return res.getInt("id_conversation");
+		}
+		return -1;
+	}
+
+	
+	/**
+	 * Get the initialization vector for a given conversation (represented by its
+	 * id).
+	 * 
+	 * @param idConversation
+	 * @return The iv corresponding to the conversation or null if the conversation
+	 *         does not exist in the database.
+	 * @throws SQLException
+	 */
+	private IvParameterSpec getIvConversation(int idConversation) throws SQLException {
+		String getIvRequest = "SELECT iv_conversation " + "FROM conversation " + "WHERE id_conversation = ?;";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getIvRequest);
+		prepStmt.setInt(1, idConversation);
+		ResultSet res = prepStmt.executeQuery();
+
+		if (res.next()) {
+			return new IvParameterSpec(res.getBytes("iv_conversation"));
+		}
+
+		return null;
+	}
+
+	
+	/**
+	 * Get the id of the message type corresponding to the given label.
+	 * 
+	 * @param label
+	 * @return The id of the message type or -1 if it does not exist in the
+	 *         database.
+	 * @throws SQLException
+	 */
+	private int getIDType(String label) throws SQLException {
+		String getIDRequest = "SELECT id_type FROM type WHERE label = ?;";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getIDRequest);
+		prepStmt.setString(1, label);
+
+		ResultSet res = prepStmt.executeQuery();
+
+		if (res.next()) {
+			return res.getInt("id_type");
+		}
+		return -1;
+	}
+
+	
+	/**
+	 * Get the label of the message type corresponding to the given id.
+	 * 
+	 * @param idType
+	 * @return The label of the message type or "" if it does not exist in the
+	 *         database.
+	 * @throws SQLException
+	 */
+	private String getType(int idType) throws SQLException {
+		String getTypeRequest = "SELECT label FROM type WHERE id_type = ?;";
+
+		PreparedStatement prepStmt = this.connec.prepareStatement(getTypeRequest);
+		prepStmt.setInt(1, idType);
+
+		ResultSet res = prepStmt.executeQuery();
+
+		if (res.next()) {
+			return res.getString("label");
+		}
+
+		return "";
+
+	}
+
+	
+	// -------------- PROCESSING MESSAGE METHODS -------------- //
+	
+	/**
+	 * Convert a message in bytes. First get the content of the message. Then
+	 * encrypt it with the database_key and the given iv (initialization vector).
+	 * 
+	 * @param m
+	 * @param iv
+	 * @return The bytes of the encrypted message's content.
+	 * 
+	 * @throws InvalidKeyException
+	 * @throws NoSuchAlgorithmException
+	 * @throws NoSuchPaddingException
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws IllegalBlockSizeException
+	 * @throws BadPaddingException
+	 */
+	private byte[] stringToBytesContent(Message m, IvParameterSpec iv)
+			throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException,
+			InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
+		String content;
+		if (m.getTypeMessage() == TypeMessage.TEXTE) {
+			MessageTexte messageTxt = (MessageTexte) m;
+			content = messageTxt.getContenu();
+		} else {
+			MessageFichier messageFichier = (MessageFichier) m;
+			content = messageFichier.getContenu();
+		}
+		byte[] encryptedContent = SQLiteEncryption.encrypt(SQLiteEncryption.encryptAlgorithm, content.getBytes(),
+				this.dbDataKey, iv);
+		return encryptedContent;
+
+	}
+
+	
+	/**
+	 * Convert bytes in a String. In this context, the bytes correspond to the
+	 * encrypted content of a message.
+	 * 
+	 * @param encryptedContent
+	 * @param iv
+	 * @return The String corresponding to the decrypted bytes.
+	 * 
+	 * @throws InvalidKeyException
+	 * @throws NoSuchAlgorithmException
+	 * @throws NoSuchPaddingException
+	 * @throws InvalidAlgorithmParameterException
+	 * @throws IllegalBlockSizeException
+	 * @throws BadPaddingException
+	 */
+	private String bytesToStringContent(byte[] encryptedContent, IvParameterSpec iv)
+			throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException,
+			InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
+		return SQLiteEncryption.decryptString(SQLiteEncryption.encryptAlgorithm, encryptedContent, this.dbDataKey, iv);
+	}
+
+	
+	/**
+	 * Process the type of a message
+	 * 
+	 * @param m
+	 * @return The type of the message
+	 */
+	private String processMessageType(Message m) {
+		switch (m.getTypeMessage()) {
+		case TEXTE:
+			return "text";
+		case FICHIER:
+			return "file";
+		case IMAGE:
+			return "image";
+		default:
+			return "";
+		}
+	}
+
+	
+	/**
+	 * Process the extension of a message
+	 * 
+	 * @param m
+	 * @return The extension of the message. null if it is a simple text message.
+	 */
+	private String processExtension(Message m) {
+		if (m.getTypeMessage() == TypeMessage.TEXTE) {
+			return null;
+		} else {
+			MessageFichier mFile = (MessageFichier) m;
+			return mFile.getExtension();
+		}
+	}
+
+	// -------------- USER SECURITY RELATED METHODS -------------- //
+
+	
+	/**
+	 * Creates a new user in the database from a given username and password. The
+	 * username is stored in plain text. An encrypted hash of the password is
+	 * stored. The key used to encrypt the password's hash is itself encrypted then
+	 * stored. Every other useful data to decrypt the key and compare the password's
+	 * hash is stored as plaintext.
+	 * 
+	 * Fail if a user with the given username already exists in the database.
+	 * 
+	 * @param username
+	 * @param password
+	 */
+	public void createNewUserEncrypt(String username, String password) {
+
+		String algo = SQLiteEncryption.encryptAlgorithm;
+
+		KeyGenerator keyGen = null;
+		try {
+			keyGen = KeyGenerator.getInstance("AES");
+			keyGen.init(256);
+		} catch (NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		}
+
+		byte[] passwordSalt = SQLiteEncryption.getNextSalt();
+		byte[] dbDataKeySalt = SQLiteEncryption.getNextSalt();
+
+		SecretKey dbDataKey = keyGen.generateKey();
+
+		SecretKey dbDataEncryptKey = SQLiteEncryption.getKey(password.toCharArray(), dbDataKeySalt);
+		IvParameterSpec ivDbDataKey = SQLiteEncryption.generateIv();
+
+		byte[] passwordHash = SQLiteEncryption.hash(password.toCharArray(), passwordSalt);
+
+		byte[] dbDataKeyEncrypted = null;
+		byte[] encryptedPasswordHash = null;
+
+		try {
+			dbDataKeyEncrypted = SQLiteEncryption.encrypt(algo, SQLiteEncryption.keyToByte(dbDataKey), dbDataEncryptKey,
+					ivDbDataKey);
+			encryptedPasswordHash = SQLiteEncryption.encrypt(algo, passwordHash, dbDataKey, ivDbDataKey);
+
+		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
+				| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
+			e.printStackTrace();
+		}
+
+		this.openConnection();
+
+		String createUserRequest = "INSERT INTO user(username, pwd_salt, db_datakey_salt, encrypted_pwd_hashsalt, encrypted_db_datakey, iv_datakey) "
+				+ "VALUES (?, ?, ?, ?, ?, ?); ";
+
+		PreparedStatement prepStmt = null;
+		try {
+			prepStmt = this.connec.prepareStatement(createUserRequest);
+			prepStmt.setString(1, username);
+			prepStmt.setBytes(2, passwordSalt);
+			prepStmt.setBytes(3, dbDataKeySalt);
+			prepStmt.setBytes(4, encryptedPasswordHash);
+			prepStmt.setBytes(5, dbDataKeyEncrypted);
+			prepStmt.setBytes(6, ivDbDataKey.getIV());
+
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+
+		try {
+			prepStmt.executeUpdate();
+			System.out.println("Utilisateur crée");
+		} catch (SQLException e) {
+			System.out.println("Nom d'utilisateur déjà pris");
+		}
+
+		this.closeConnection();
+
+	}
+
+	
+	/**
+	 * Check if a given password has the same hash (= they're the same) as the one
+	 * stored in the database for a given username.
+	 * 
+	 * @param username
+	 * @param password
+	 * @return -1 if user do not exists, 0 if password is incorrect, 1 if password
+	 *         is correct
+	 * @throws SQLException
+	 */
+	public int checkPwd(String username, char[] password) throws SQLException {
+
+		this.openConnection();
+
+		String selectUserDataRequest = "SELECT pwd_salt, db_datakey_salt, encrypted_pwd_hashsalt, encrypted_db_datakey, iv_datakey "
+				+ "FROM user " + "WHERE username = ?;";
+		PreparedStatement prepStmt;
+		prepStmt = this.connec.prepareStatement(selectUserDataRequest);
+		prepStmt.setString(1, username);
+
+		ResultSet res = prepStmt.executeQuery();
+		if (!res.next()) {
+			return -1;
+		}
+
+		byte[] passwordSalt = res.getBytes("pwd_salt");
+
+		if (passwordSalt == null) {
+			return 0;
+		}
+
+		byte[] dbDataKeySalt = res.getBytes("db_datakey_salt");
+
+		SecretKey dbDataEncryptKey = SQLiteEncryption.getKey(password, dbDataKeySalt);
+
+		byte[] ivBytes = res.getBytes("iv_datakey");
+
+		if (ivBytes == null) {
+			return 0;
+		}
+
+		IvParameterSpec iv = new IvParameterSpec(ivBytes);
+		byte[] encryptedDbDataKey = res.getBytes("encrypted_db_datakey");
+
+		SecretKey dbDataKey = null;
+		try {
+			dbDataKey = SQLiteEncryption.byteToKey(SQLiteEncryption.decryptByte(SQLiteEncryption.encryptAlgorithm,
+					encryptedDbDataKey, dbDataEncryptKey, iv));
+		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
+				| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
+		}
+
+		byte[] encryptedPasswordHash = res.getBytes("encrypted_pwd_hashsalt");
+
+		byte[] passwordHash = SQLiteEncryption.hash(password, passwordSalt);
+
+		this.closeConnection();
+
+		boolean checkHash = this.checkHashPwd(passwordHash, encryptedPasswordHash, dbDataKey, iv);
+		if (checkHash) {
+
+			// Set the database key to be used in future encryptions if the given password is
+			// correct.
+			this.dbDataKey = dbDataKey;
+			return 1;
+		}
+
+		return 0;
+	}
+	
+
+	/**
+	 * Check if two given hash are the same once the second one has been decrypted
+	 * with the given key and iv.
+	 * 
+	 * @param passwordHash
+	 * @param encryptedPasswordHash
+	 * @param dbDataKey
+	 * @param iv
+	 * @return true if the first hash is equal to the second one once decrypted,
+	 *         false otherwise.
+	 * 
+	 */
+	private boolean checkHashPwd(byte[] passwordHash, byte[] encryptedPasswordHash, SecretKey dbDataKey,
+			IvParameterSpec iv) {
+
+		byte[] expectedHash = "".getBytes();
+		try {
+			expectedHash = SQLiteEncryption.decryptByte(SQLiteEncryption.encryptAlgorithm, encryptedPasswordHash,
+					dbDataKey, iv);
+		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
+				| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
+		}
+
+		if (passwordHash.length != expectedHash.length)
+			return false;
+		for (int i = 0; i < passwordHash.length; i++) {
+			if (passwordHash[i] != expectedHash[i])
+				return false;
+		}
+		return true;
+	}
+	
+	
+
+	// Main to create 20 users in the database with the given number
+	public static void main(String[] args) {
+		String[] hardcodedNames = { "Olivia", "Liam", "Benjamin", "Sophia", "Charlotte", "Noah", "Elijah", "Isabella",
+				"Oliver", "Emma", "William", "Amelia", "Evelyn", "James", "Mia", "Ava", "Lucas", "Mason", "Ethan",
+				"Harper" };
+
+		String pwdPrefix = "aze1$";
+
+		SQLiteManager sqlManager = new SQLiteManager(0);
+
+		for (int i = 0; i < hardcodedNames.length; i++) {
+			sqlManager.createNewUserEncrypt(hardcodedNames[i] + i, pwdPrefix + hardcodedNames[i].charAt(0) + i);
+		}
+
+	}
+
+}

POO/src/main/Main.java

@@ -0,0 +1,37 @@
+package main;
+
+
+import javax.swing.JPanel;
+import javax.swing.UIManager;
+import javax.swing.UIManager.LookAndFeelInfo;
+
+import communication.filetransfer.FileTransferUtils;
+import connexion.VueConnexion;
+
+public class Main extends JPanel{
+
+	
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	public static void main(String[] args) {
+		
+		try {
+		    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
+		        if ("Nimbus".equals(info.getName())) {
+		            UIManager.setLookAndFeel(info.getClassName());
+		            break;
+		        }
+		    }
+		} catch (Exception e) {
+		    // If Nimbus is not available, you can set the GUI to another look and feel.
+		}
+		
+		FileTransferUtils.createDownloads();
+		
+		new VueConnexion(Integer.parseInt(args[0]));
+	}
+
+}

POO/src/main/Utilisateur.java

@@ -0,0 +1,115 @@
+package main;
+import java.io.Serializable;
+import java.net.*;
+
+public class Utilisateur implements Serializable{
+
+
+	private static final long serialVersionUID = 1L;
+	
+	private String id;
+	private String pseudo;
+	private InetAddress ip;
+	private int port;
+	
+	//Represents the user that is currently using the application
+	private static Utilisateur self;
+	
+	
+	/**
+	 * Create and initialize an object representing an user
+	 * 
+	 * @param id : user id as String
+	 * @param pseudo : name under which other users can see this user as String
+	 * @param ip : ip of the device this user is currently using as InetAddress
+	 * @param port : on local mode, port used for the TCP listen socket as int
+	 * 
+	 */
+	public Utilisateur(String id, String pseudo, InetAddress ip, int port) throws UnknownHostException {
+		this.id = id;
+		this.pseudo = pseudo;
+		this.ip = ip;
+		this.port = port;
+
+	}
+	
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns user id as String
+	 * 
+	 * @return user id as String
+	 */
+	public String getId() {
+		return id;
+	}
+
+	/**
+	 * Returns user pseudo as String
+	 * 
+	 * @return user pseudo as String
+	 */
+	public String getPseudo() {
+		return pseudo;
+	}
+	
+	/**
+	 * Returns user device's ip as String
+	 * 
+	 * @return user device's ip as String
+	 */
+	public InetAddress getIp() {
+		return ip;
+	}
+	
+	/**
+	 * Returns the port the user uses for their TCP listen socket as int
+	 * 
+	 * @return TCP listen socket port as int
+	 */
+	public int getPort() {
+		return port;
+	}
+	
+	/**
+	 * Returns the user currently using this instance of the application as Utilisateur
+	 * 
+	 * @return current user as Utilisateur
+	 */	
+	public static Utilisateur getSelf() {
+		return Utilisateur.self;
+	}
+	
+	
+	// ----- SETTERS ----- //
+
+	/**
+	 * Change the pseudo used by an user
+	 * 
+	 * @param pseudo : new pseudo as String
+	 */	
+	public void setPseudo(String pseudo) {
+		this.pseudo = pseudo;
+	}
+	
+	/**
+	 * Sets the self static attribute with a new Utilisateur
+	 * 
+	 * @param id : user id as String
+	 * @param pseudo : name under which other users can see this user as String
+	 * @param ip : ip of the device this user is currently using as InetAddress
+	 * @param port : on local mode, port used for the TCP listen socket as int
+	 */	
+	public static void setSelf(String id, String pseudo, String host, int port) throws UnknownHostException {
+		if(Utilisateur.self == null) {
+			Utilisateur.self = new Utilisateur(id, pseudo, InetAddress.getByName(host), port);
+		}
+	}
+	
+	/**
+	 * Sets the self static attribute with null
+	 */
+	public static void resetSelf() {
+		Utilisateur.self = null;
+	}
+}

POO/src/main/Vue.java

@@ -0,0 +1,22 @@
+package main;
+
+import javax.swing.JFrame;
+
+
+// General class from which all VueX class derivate
+
+public class Vue extends JFrame{
+
+	private static final long serialVersionUID = 1L;
+
+	public Vue(String title) {
+		super(title);
+		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	}
+	
+	public void reduireAgent() {}
+	
+	public void close() {
+		this.dispose();
+	}
+}

POO/src/messages/MauvaisTypeMessageException.java

@@ -0,0 +1,8 @@
+package messages;
+
+public class MauvaisTypeMessageException extends Exception {
+
+	private static final long serialVersionUID = 1L;
+
+
+}

POO/src/messages/Message.java

@@ -0,0 +1,130 @@
+package messages;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public abstract class Message implements Serializable {
+
+	public enum TypeMessage {JE_SUIS_CONNECTE, JE_SUIS_DECONNECTE, INFO_PSEUDO, TEXTE, IMAGE, FICHIER, FICHIER_INIT, FICHIER_ANSWER}
+	protected TypeMessage type;
+	private String dateMessage;
+	private String sender;
+	private static final long serialVersionUID = 1L;
+	
+	
+	
+	// ------- GETTERS ------ //
+	
+	/**
+	 * Returns the current date and time as a string using DateTimeFormatter and LocalDateTime
+	 * 
+	 * @return date and time as a String
+	 */
+	public static String getDateAndTime() {
+		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
+		LocalDateTime now = LocalDateTime.now();
+		return dtf.format(now);
+	}
+	
+	/**
+	 * Returns the type of the message
+	 * 
+	 * @return message type as TypeMessage
+	 */
+	public TypeMessage getTypeMessage() {
+		return this.type;
+	}
+	
+	/**
+	 * Returns the date and time to which the message was timestamped
+	 * 
+	 * @return date and time of timestamp as String
+	 */
+	public String getDateMessage() {
+		return this.dateMessage;
+	}
+	
+	/**
+	 * Returns the sender of the message (used in the database)
+	 * 
+	 * @return sender of message as String
+	 */
+	public String getSender() {
+		return this.sender ;
+	}
+	
+
+	
+	// ------ SETTERS ------ //
+	
+	/**
+	 * Set the date of the message to a specific timestamp
+	 * 
+	 * @param timestamp as (formatted) String
+	 */
+	public void setDateMessage(String dateMessage) {
+		this.dateMessage = dateMessage;
+	}
+	
+	/**
+	 * Set the sender of the message to a specified string
+	 * 
+	 * @param sender pseudo as String
+	 */
+	public void setSender(String sender) {
+		this.sender = sender;
+	}	
+	
+	
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+
+	/**
+	 * Returns a string representing the formatted list of attributes
+	 * 
+	 *@return attributes as a String
+	 */
+	protected abstract String attributsToString();
+
+	/**
+	 * Returns the message as a formatted string
+	 * 
+	 *@return message as a String
+	 */
+	public String toString() {
+		return this.type+"###"+this.attributsToString();
+	}	
+
+	/**
+	 * Static method. Returns a message obtainer by parsing a given string
+	 * 
+	 *@param String representing a message
+	 *@return Message
+	 */
+	public static Message stringToMessage(String messageString) {
+		try {
+			String[] parts = messageString.split("###");
+			switch (parts[0]) {
+			case "JE_SUIS_CONNECTE" :
+				return new MessageSysteme(TypeMessage.JE_SUIS_CONNECTE);
+				
+			case "JE_SUIS_DECONNECTE" :
+				return new MessageSysteme(TypeMessage.JE_SUIS_DECONNECTE, parts[1], parts[2], Integer.parseInt(parts[3]) );
+				
+			case "INFO_PSEUDO" :
+				return new MessageSysteme(TypeMessage.INFO_PSEUDO, parts[1], parts[2], Integer.parseInt(parts[3]) );
+				
+			case "TEXTE" :
+				return new MessageTexte(TypeMessage.TEXTE, parts[1]);
+				
+			case "IMAGE" :
+				return new MessageFichier(TypeMessage.IMAGE, parts[1], parts[2]);
+				
+			case "FICHIER" :
+				return new MessageFichier(TypeMessage.FICHIER, parts[1], parts[2]);
+			}
+		} catch (MauvaisTypeMessageException e) {}
+			return null;
+	}
+
+}

POO/src/messages/MessageFichier.java

@@ -0,0 +1,82 @@
+package messages;
+
+public class MessageFichier extends Message {
+	
+
+	private static final long serialVersionUID = 1L;
+	private String contenu;
+	private String extension;
+
+	/**
+	 * Create a file message. These message are used for all interactions regarding file transfer.
+	 * 
+	 * The "FICHIER_INIT" messages are used to inform the recipient application that you wish to transfer them files.
+	 * The "FICHIER_ANSWER" messages are answers to "FICHIER_INIT" messages. They indicate that you are ready to receive the file.
+	 * The "contenu" argument then contains the port on which you wish to receive the files.
+	 * 
+	 * The "FICHIER" messages contains the files themselves.
+	 * The "IMAGE" messages contains images files, which means the application will display a thumbnail for the image to the recipient.
+	 * 
+	 * @param TypeMessage type (must be FICHIER_INIT, FICHIER_ANSWER, FICHIER or IMAGE, else an error is raised)
+	 * @param contenu : message content as String
+	 * @param extension : file extension as string
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageFichier(TypeMessage type, String contenu, String extension) throws MauvaisTypeMessageException{
+		if ((type==TypeMessage.IMAGE)||(type==TypeMessage.FICHIER) ||(type==TypeMessage.FICHIER_INIT) || (type==TypeMessage.FICHIER_ANSWER) ) {
+			this.type=type;
+			this.contenu=contenu;
+			this.extension=extension;
+			this.setDateMessage(Message.getDateAndTime());
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+
+	// ----- GETTERS ----- //
+	
+	
+	/**
+	 * Returns content of the message
+	 * 
+	 * @return content as String
+	 */
+	public String getContenu() {
+		return this.contenu;
+	}
+	
+	/**
+	 * Returns extension of the file contained in the message (if the message contains a file)
+	 * 
+	 * @return extension as String
+	 */
+	public String getExtension() {
+		return this.extension;
+	}
+
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */	
+	@Override
+	protected String attributsToString() {
+		return this.contenu+"###"+this.extension;
+	}
+	
+	public String toString() {
+		if(this.type == TypeMessage.IMAGE) {
+			return this.contenu;
+		}else {
+			String suffixe;
+			if(this.getSender().equals("Moi")) {
+				suffixe = "envoyé\n";
+			}else {
+				suffixe = "reçu\n";
+			}
+			return "<"+this.getDateMessage()+"> : "+this.contenu+" "+suffixe;
+		}
+	}
+}

POO/src/messages/MessageSysteme.java

@@ -0,0 +1,97 @@
+package messages;
+
+
+public class MessageSysteme extends Message {
+	
+	private static final long serialVersionUID = 1L;
+	private String pseudo;
+	private String id;
+	private int port;
+
+	// ------ CONSTRUCTORS ------ //
+	
+	/**
+	 * Create a system message. These message are used for all system interactions by the UDP channel.
+	 * The "JE_SUIS_CONNECTE" messages are used to inform the network that you just joined.
+	 * They are sent directly after an user log in, and await multiple "INFO_PSEUDO" messages as answers, to build the table of users logged in.
+	 * 
+	 * @param TypeMessage type (must be JE_SUIS_CONNECTE, else an error is raised)
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageSysteme(TypeMessage type) throws MauvaisTypeMessageException{
+		if (type==TypeMessage.JE_SUIS_CONNECTE) {
+			this.type=type;
+			this.pseudo="";
+			this.id="";
+			this.port = -1;
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+	
+	/**
+	 * Create a system message. These message are used for all system interactions by the UDP channel.
+	 * The "JE_SUIS_DECONNECTE" messages are used to inform the network that you just quit it.
+	 * 
+	 * The "INFO_PSEUDO" are used to give informations about you to another user, much like an business card.
+	 * They are used either as an answer to a "JE_SUIS_CONNECTE" message or to inform the network of a change of pseudo.
+	 * 
+	 * @param TypeMessage type (must be JE_SUIS_DECONNECTE or INFO_PSEUDO, else an error is raised)
+	 * @param pseudo : user pseudo as String
+	 * @param id : user id as String
+	 * @param port : "server" UDP port used by the application (used when the application id in local mode)
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageSysteme(TypeMessage type, String pseudo, String id, int port) throws MauvaisTypeMessageException {
+		if (type==TypeMessage.INFO_PSEUDO ||(type==TypeMessage.JE_SUIS_DECONNECTE)) {
+			this.type=type;
+			this.pseudo=pseudo;
+			this.id=id;
+			this.port = port;
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+	
+	
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns pseudo of the sender of the message (when type == INFO_PSEUDO)
+	 * 
+	 * @return user pseudo as String
+	 */
+	public String getPseudo() {
+		return this.pseudo;
+	}
+	
+	/**
+	 * Returns id of the sender of the message (when type == INFO_PSEUDO)
+	 * 
+	 * @return user id as String
+	 */
+	public String getId() {
+		return this.id;
+	}
+
+	/**
+	 * Returns the "server" UDP port used by the sender of the message
+	 * 
+	 * @return port as integer
+	 */
+	public int getPort() {
+		return this.port;
+	}
+	
+	
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */
+	@Override
+	protected String attributsToString() {
+		return this.pseudo+"###"+this.id+"###"+this.port;
+	}
+}

POO/src/messages/MessageTexte.java

@@ -0,0 +1,55 @@
+package messages;
+
+public class MessageTexte extends Message {
+	
+
+	private static final long serialVersionUID = 1L;
+	private String contenu;
+	
+
+	/**
+	 * Create a text message. These message are used for basic text conversation via TCP.
+	 * 
+	 * @param TypeMessage type (must be TEXT, else an error is raised)
+	 * @param contenu : message content as String
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageTexte(TypeMessage type, String contenu) throws MauvaisTypeMessageException{
+		if (type==TypeMessage.TEXTE) {
+			this.type=type;
+			this.contenu=contenu;
+			this.setDateMessage(Message.getDateAndTime());
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns content of the message
+	 * 
+	 * @return content as String
+	 */	
+	public String getContenu() {
+		return this.contenu;
+	}
+	
+
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */	
+	@Override
+	protected String attributsToString() {
+		return this.contenu;
+	}
+	
+	@Override
+	public String toString() {
+		return "<"+this.getDateMessage()+"> "+this.getSender()+" : "+this.contenu+"\n";
+	}
+}

POO/src/observers/ObserverInputMessage.java

@@ -0,0 +1,12 @@
+package observers;
+
+public interface ObserverInputMessage {
+
+	/**
+	 * Method called when data is received from a TCP socket
+	 * 
+	 * @param o   : The observer to notify
+	 * @param arg : An object
+	 */
+	public void updateInput(Object o, Object arg);
+}

POO/src/observers/ObserverSocketState.java

@@ -0,0 +1,13 @@
+package observers;
+
+public interface ObserverSocketState {
+
+	/**
+	 * Method called when a TCP socket is closed/a communication is broken
+	 * 
+	 * @param o   : The observer to notify
+	 * @param arg : An object
+	 */
+	public void updateSocketState(Object o, Object arg);
+
+}

POO/src/observers/ObserverUserList.java

@@ -0,0 +1,17 @@
+package observers;
+
+import java.util.ArrayList;
+
+import main.Utilisateur;
+
+public interface ObserverUserList {
+
+	/**
+	 * Method called when the userlist is updated
+	 * 
+	 * @param o        : The observer to notify
+	 * @param userList : The userlist
+	 */
+	public void updateList(Object o, ArrayList<Utilisateur> userList);
+
+}

POO/src/session/ControleurSession.java

@@ -0,0 +1,352 @@
+package session;
+
+import java.awt.event.ActionEvent;
+
+import java.awt.event.ActionListener;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.io.File;
+import java.io.IOException;
+import java.net.Socket;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+
+import javax.swing.JButton;
+import javax.swing.JFileChooser;
+
+import communication.filetransfer.FileTransferClient;
+import communication.filetransfer.FileTransferServer;
+import communication.tcp.TCPClient;
+import database.SQLiteManager;
+import main.Utilisateur;
+import messages.MauvaisTypeMessageException;
+import messages.Message;
+import messages.MessageFichier;
+import messages.MessageTexte;
+import messages.Message.TypeMessage;
+import observers.ObserverInputMessage;
+import observers.ObserverSocketState;
+
+public class ControleurSession implements ActionListener, ObserverInputMessage, ObserverSocketState, KeyListener {
+
+	private VueSession vue;
+	private String idOther;
+	private String pseudoOther;
+	private TCPClient tcpClient;
+	private ArrayList<Message> messagesIn;
+	private ArrayList<Message> messagesOut;
+	private SQLiteManager sqlManager;
+	private ArrayList<File> files;
+
+	/**
+	 * Create the controller for this session. It will manage all the objects used
+	 * to send/receive messages and files as well as the ones interacting with the
+	 * database. It will handle the actions performed on the view and call the
+	 * appropriate methods to display messages and data on the view.
+	 * 
+	 * @param vue         		The corresponding view
+	 * @param socketComm  		The socket used to send/receive messages
+	 * @param idOther     		The other user's id
+	 * @param pseudoOther 		The other user's pseudo
+	 * @param sqlManager  		The SQLManager instance to retrieve/insert
+	 *                   		users,conversations,messages from/into the database
+	 * @throws IOException
+	 */
+	protected ControleurSession(VueSession vue, Socket socketComm, String idOther, String pseudoOther,
+			SQLiteManager sqlManager) throws IOException {
+		this.vue = vue;
+		this.tcpClient = new TCPClient(socketComm);
+		this.tcpClient.setObserverInputThread(this);
+		this.tcpClient.setObserverSocketState(this);
+		this.tcpClient.startInputThread();
+		this.messagesIn = new ArrayList<Message>();
+		this.messagesOut = new ArrayList<Message>();
+
+		this.idOther = idOther;
+		this.pseudoOther = pseudoOther;
+
+		this.sqlManager = sqlManager;
+
+		this.files = new ArrayList<File>();
+	}
+
+	
+	// ---------- ACTION LISTENER OPERATIONS ---------- //
+	@Override
+	public void actionPerformed(ActionEvent e) {
+
+		// If the button "Envoyer" is pressed
+		if ((JButton) e.getSource() == this.vue.getButtonEnvoyer()) {
+			String messageContent = this.vue.getInputedText();
+			System.out.println(messageContent);
+
+			if (!this.files.isEmpty()) {
+				this.processSelectedFiles(messageContent);
+				if (!this.files.isEmpty()) {
+					this.askFileTransfer();
+
+					this.vue.resetZoneSaisie();
+					messageContent = "";
+				}
+			}
+
+			// If the text field is not empty
+			if (!messageContent.equals("")) {
+
+				// Retrieve the date and prepare the messages to send/display
+				MessageTexte messageOut = null;
+
+				try {
+					messageOut = new MessageTexte(TypeMessage.TEXTE, messageContent);
+					messageOut.setSender(Utilisateur.getSelf().getPseudo());
+				} catch (MauvaisTypeMessageException e2) {
+					e2.printStackTrace();
+				}
+
+				try {
+					this.tcpClient.sendMessage(messageOut);
+				} catch (IOException e1) {
+					e1.printStackTrace();
+				}
+
+				messageOut.setSender("Moi");
+				this.vue.appendMessage(messageOut);
+				this.vue.resetZoneSaisie();
+
+				this.messagesOut.add(messageOut);
+			}
+		}
+
+		// If the button "Importer" is pressed
+		if ((JButton) e.getSource() == this.vue.getButtonImportFile()) {
+
+			// Display a file chooser to select one or several files
+			JFileChooser fc = new JFileChooser();
+			fc.setMultiSelectionEnabled(true);
+			int returVal = fc.showDialog(this.vue, "Importer");
+
+			// If the user clicked on "Importer",
+			// Retrieve all the files he clicked on.
+			// The files are stored in this.files
+			// and their names are display in the ChatInput.
+			if (returVal == JFileChooser.APPROVE_OPTION) {
+				File[] files = fc.getSelectedFiles();
+				Collections.addAll(this.files, files);
+				for (File file : files) {
+					this.vue.appendInputedText(file.getName());
+					this.vue.appendInputedText(";");
+				}
+			}
+
+		}
+
+	}
+
+	
+	// ---------- KEY LISTENER METHODS ---------- //
+
+	@Override
+	public void keyTyped(KeyEvent e) {
+	}
+
+	
+	@Override
+	public void keyPressed(KeyEvent e) {
+		if (e.getKeyCode() == KeyEvent.VK_ENTER) {
+			if (!e.isShiftDown()) {
+				this.vue.getButtonEnvoyer().doClick();
+			}
+
+		}
+	}
+
+	
+	@Override
+	public void keyReleased(KeyEvent e) {
+	}
+
+	
+	// ---------- OTHERS ---------- //
+
+	/**
+	 * Create and send the message to ask for a file transfer.
+	 */
+	private void askFileTransfer() {
+		try {
+			MessageFichier messageOut = new MessageFichier(TypeMessage.FICHIER_INIT, "" + this.files.size(), "");
+			this.tcpClient.sendMessage(messageOut);
+		} catch (MauvaisTypeMessageException | IOException e1) {
+			e1.printStackTrace();
+		}
+	}
+
+	
+	/**
+	 * Create and send the answer with the port on which the FileTransferServer is
+	 * listening.
+	 * 
+	 * @param port
+	 */
+	private void answerFileTransfer(int port) {
+		try {
+			MessageFichier messageOut = new MessageFichier(TypeMessage.FICHIER_ANSWER, "" + port, "");
+			this.tcpClient.sendMessage(messageOut);
+		} catch (MauvaisTypeMessageException | IOException e1) {
+			e1.printStackTrace();
+		}
+	}
+
+	
+	/**
+	 * Retrieve the files' names from the given input using ";" as a separator
+	 * Removes the files whose names are missing.
+	 * 
+	 * This method is used to check if a file's name has been deleted/overwritten in
+	 * the ChatInput. Indeed, the only way to cancel the import of a file is by
+	 * deleting its name from the ChatInput.
+	 * 
+	 * @param input
+	 */
+	private void processSelectedFiles(String input) {
+		String[] tmp = input.split(";");
+		ArrayList<String> potentialFiles = new ArrayList<String>();
+		Collections.addAll(potentialFiles, tmp);
+
+		for (File file : this.files) {
+			if (!potentialFiles.contains(file.getName())) {
+				this.files.remove(file);
+			}
+		}
+	}
+
+	
+	/**
+	 * Retrieve the messages previously exchanged between the current user of the
+	 * application and the other user of this session
+	 * 
+	 * @return The ArrayList of all previous messages
+	 */
+	protected ArrayList<Message> getHistorique() {
+		try {
+			ArrayList<Message> historique = this.sqlManager.getMessageRecord(idOther, pseudoOther);
+			return historique;
+		} catch (SQLException e) {
+			e.printStackTrace();
+			return new ArrayList<Message>();
+
+		}
+	}
+
+	
+	/**
+	 * Method used when the session is over. Insert every message exchanged in the
+	 * database, set all attributes' references to null, and call destroyAll() on
+	 * the TCPClient.
+	 */
+	protected void destroyAll() {
+		String idSelf = Utilisateur.getSelf().getId();
+		String idOther = this.idOther;
+
+		try {
+			this.sqlManager.insertAllMessages(messagesOut, idSelf, idOther);
+			this.sqlManager.insertAllMessages(messagesIn, idOther, idSelf);
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+
+		this.vue = null;
+		this.tcpClient.destroyAll();
+		this.tcpClient = null;
+	}
+
+	
+	// ---------- OBSERVERS ---------- //
+
+	// Method called when a message is received from the TCP socket
+	@Override
+	public void updateInput(Object o, Object arg) {
+		Message message = (Message) arg;
+
+		switch (message.getTypeMessage()) {
+
+		// If it is a simple text message, display it
+		case TEXTE:
+			System.out.println(message.toString());
+			this.vue.appendMessage(message);
+			this.messagesIn.add(message);
+			break;
+
+		// If it is an image, display a thumbnail
+		case IMAGE:
+			this.vue.appendImage(message);
+
+			if (message.getSender().equals("Moi")) {
+				this.messagesOut.add(message);
+			} else {
+				this.messagesIn.add(message);
+			}
+			break;
+
+		// If it is a file, display a message saying whether it has been sent/received.
+		case FICHIER:
+			this.vue.appendMessage(message);
+
+			if (message.getSender().equals("Moi")) {
+				this.messagesOut.add(message);
+			} else {
+				this.messagesIn.add(message);
+			}
+			break;
+
+		// If it is a demand for a file transfer, create a new FileTransferServer, start
+		// it
+		// and answer back with "FICHIER_ANSWER" message containing the port of the
+		// server.
+		case FICHIER_INIT:
+			try {
+				MessageFichier mFichier = (MessageFichier) arg;
+				int nbFile = Integer.parseInt(mFichier.getContenu());
+				FileTransferServer fts = new FileTransferServer(nbFile, this);
+				int port = fts.getPort();
+				fts.start();
+				this.answerFileTransfer(port);
+
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+			break;
+
+		// If it is an answer for a file transfer, create a FilteTransferClient
+		// with the port received and the path of the file(s) to send,
+		// and send the files.
+		case FICHIER_ANSWER:
+			try {
+				MessageFichier mFichier = (MessageFichier) arg;
+				int port = Integer.parseInt(mFichier.getContenu());
+
+				@SuppressWarnings("unchecked")
+				FileTransferClient ftc = new FileTransferClient(port, (ArrayList<File>) this.files.clone(), this);
+
+				ftc.sendFiles();
+				this.files.clear();
+			} catch (IOException | InterruptedException e) {
+				e.printStackTrace();
+			}
+
+			break;
+
+		// Do nothing
+		default:
+		}
+
+	}
+
+	// If the other user closes the session or the communication is broken
+	// Disable the view (TextArea, Buttons..) and display a message
+	@Override
+	public void updateSocketState(Object o, Object arg) {
+		this.vue.endSession(this.pseudoOther);
+	}
+
+}

POO/src/session/VueSession.java

@@ -0,0 +1,317 @@
+package session;
+
+import java.awt.*;
+import java.awt.event.KeyEvent;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.net.Socket;
+import java.util.ArrayList;
+
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+import javax.swing.JTextPane;
+import javax.swing.KeyStroke;
+import javax.swing.ScrollPaneConstants;
+import javax.swing.border.EmptyBorder;
+import javax.swing.text.AbstractDocument;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.BoxView;
+import javax.swing.text.ComponentView;
+import javax.swing.text.Document;
+import javax.swing.text.Element;
+import javax.swing.text.IconView;
+import javax.swing.text.LabelView;
+import javax.swing.text.ParagraphView;
+import javax.swing.text.StyleConstants;
+import javax.swing.text.StyledDocument;
+import javax.swing.text.StyledEditorKit;
+import javax.swing.text.View;
+import javax.swing.text.ViewFactory;
+
+import communication.filetransfer.FileTransferUtils;
+import database.SQLiteManager;
+import messages.Message;
+import messages.Message.TypeMessage;
+
+public class VueSession extends JPanel {
+
+	private static final long serialVersionUID = 1L;
+
+	private JButton sendMessage;
+	private JButton importFile;
+	private JTextPane chatWindow;
+	private JTextArea chatInput;
+	private ControleurSession c;
+
+	public VueSession(Socket socketComm, String idOther, String pseudoOther, SQLiteManager sqlManager)
+			throws IOException {
+
+		this.c = new ControleurSession(this, socketComm, idOther, pseudoOther, sqlManager);
+
+		this.setBorder(new EmptyBorder(5, 5, 5, 5));
+		this.setLayout(new BorderLayout(0, 0));
+
+		// Create the display zone
+		this.chatWindow = new JTextPane();
+		this.chatWindow.setEditable(false);
+		this.chatWindow.setEditorKit(new WrapEditorKit());
+
+		JScrollPane chatScroll = new JScrollPane(this.chatWindow);
+		chatScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
+
+		// Create the input zone
+		this.chatInput = new JTextArea();
+		this.chatInput.setColumns(10);
+		this.chatInput.setLineWrap(true);
+		this.chatInput.setWrapStyleWord(true);
+		this.chatInput.addKeyListener(this.c);
+
+		JPanel bottom = new JPanel();
+		bottom.setLayout(new BorderLayout(0, 0));
+
+		// Remap "ENTER" to "none" to avoid "\n" in the input area when pressing "ENTER"
+		// to send a message
+		KeyStroke enter = KeyStroke.getKeyStroke("ENTER");
+		this.chatInput.getInputMap().put(enter, "none");
+		KeyStroke shiftEnter = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, KeyEvent.SHIFT_DOWN_MASK);
+		this.chatInput.getInputMap().put(shiftEnter, "insert-break");
+
+		// Create a scroller to be able to send messages of several lines
+		JScrollPane inputScroll = new JScrollPane(this.chatInput);
+		inputScroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
+
+		// Import file button
+		this.importFile = new JButton("Importer..");
+		this.importFile.addActionListener(this.c);
+
+		// Send message button
+		this.sendMessage = new JButton("Envoyer");
+		this.sendMessage.addActionListener(this.c);
+
+		bottom.add(this.importFile, BorderLayout.WEST);
+		bottom.add(inputScroll, BorderLayout.CENTER);
+		bottom.add(this.sendMessage, BorderLayout.EAST);
+
+		// Add the components to the view
+		this.add(chatScroll, BorderLayout.CENTER);
+		this.add(bottom, BorderLayout.SOUTH);
+
+		this.setPreferredSize(new Dimension(500, 500));
+
+		this.displayHistorique();
+
+	}
+
+	// -------------- GETTERS -------------- //
+
+	protected JButton getButtonEnvoyer() {
+		return this.sendMessage;
+	}
+
+	
+	protected JButton getButtonImportFile() {
+		return this.importFile;
+	}
+
+	
+	protected String getInputedText() {
+		return this.chatInput.getText();
+	}
+	
+
+	// -------------- DISPLAY METHODS -------------- //
+
+	/**
+	 * Append the given string to the ChatWindow.
+	 * 
+	 * @param str
+	 */
+	protected void appendString(String str) {
+		try {
+			Document doc = this.chatWindow.getDocument();
+			doc.insertString(doc.getLength(), str, null);
+		} catch (BadLocationException e) {
+			e.printStackTrace();
+		}
+	}
+
+	
+	/**
+	 * Append the given Message to the ChatWindow.
+	 * 
+	 * @param message
+	 */
+	protected void appendMessage(Message message) {
+
+		try {
+			StyledDocument sdoc = this.chatWindow.getStyledDocument();
+			sdoc.insertString(sdoc.getLength(), message.toString(), null);
+
+		} catch (BadLocationException e) {
+			e.printStackTrace();
+		}
+	}
+
+	
+	/**
+	 * Append an icon with the image contained in the given message. The message has
+	 * to contain the base64 encoded bytes of the image as a String for it to be
+	 * decoded and displayed.
+	 * 
+	 * @param message
+	 */
+	protected void appendImage(Message message) {
+		this.setCaretToEnd();
+
+		String imgString = message.toString();
+		Icon ic;
+		try {
+			BufferedImage img = FileTransferUtils.decodeImage(imgString);
+			ic = new ImageIcon(img);
+			this.chatWindow.insertIcon(ic);
+			this.appendString("\n");
+
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+	
+	private void printLineSeparator() {
+		this.appendString("------------------------------------------\n");
+	}
+
+	/**
+	 * Append the given string to the ChatInput.
+	 * 
+	 * @param str
+	 */
+	protected void appendInputedText(String str) {
+		this.chatInput.append(str);
+	}
+
+	
+	protected void resetZoneSaisie() {
+		this.chatInput.setText("");
+
+	}
+
+	
+	// -------------- OTHERS -------------- //
+
+	private void setCaretToEnd() {
+		this.chatWindow.setCaretPosition(this.chatWindow.getDocument().getLength());
+	}
+
+	
+	/**
+	 * Retrieve all the previous messages from the controller and display them by
+	 * appending them one by one to the ChatWindow.
+	 */
+	private void displayHistorique() {
+		ArrayList<Message> historique = this.c.getHistorique();
+
+		for (Message m : historique) {
+			if (m.getTypeMessage() == TypeMessage.IMAGE) {
+				this.appendImage(m);
+			} else {
+				this.appendMessage(m);
+			}
+		}
+
+		if (historique.size() > 0) {
+			this.printLineSeparator();
+		}
+	}
+
+	
+	/**
+	 * Disable the ChatInput, the buttons "Importer" and "Envoyer" and display a
+	 * message indicating the other user ended the session.
+	 * 
+	 * @param pseudoOther
+	 */
+	protected void endSession(String pseudoOther) {
+		this.printLineSeparator();
+		this.appendString(pseudoOther + " a mis fin à la session.");
+		this.chatInput.setEnabled(false);
+		this.chatInput.setFocusable(false);
+		this.sendMessage.setEnabled(false);
+		this.importFile.setEnabled(false);
+	}
+
+	
+	/**
+	 * Method used when the user closes the session. Set all attributes' references
+	 * to null, and call destroyAll() on the controller.
+	 */
+	public void destroyAll() {
+		if (this.c != null) {
+			this.c.destroyAll();
+		}
+		this.c = null;
+		this.chatInput = null;
+		this.chatWindow = null;
+		this.sendMessage = null;
+	}
+
+	
+	// ------------- PRIVATE CLASS TO WRAP TEXT -------------//
+
+	class WrapEditorKit extends StyledEditorKit {
+
+		private static final long serialVersionUID = 1L;
+
+		ViewFactory defaultFactory = new WrapColumnFactory();
+
+		public ViewFactory getViewFactory() {
+			return defaultFactory;
+		}
+
+	}
+
+	class WrapColumnFactory implements ViewFactory {
+		public View create(Element elem) {
+			String kind = elem.getName();
+			if (kind != null) {
+				if (kind.equals(AbstractDocument.ContentElementName)) {
+					return new WrapLabelView(elem);
+				} else if (kind.equals(AbstractDocument.ParagraphElementName)) {
+					return new ParagraphView(elem);
+				} else if (kind.equals(AbstractDocument.SectionElementName)) {
+					return new BoxView(elem, View.Y_AXIS);
+				} else if (kind.equals(StyleConstants.ComponentElementName)) {
+					return new ComponentView(elem);
+				} else if (kind.equals(StyleConstants.IconElementName)) {
+					return new IconView(elem);
+				}
+			}
+
+			// default to text display
+			return new LabelView(elem);
+		}
+	}
+
+	class WrapLabelView extends LabelView {
+		public WrapLabelView(Element elem) {
+			super(elem);
+		}
+
+		public float getMinimumSpan(int axis) {
+			switch (axis) {
+			case View.X_AXIS:
+				return 0;
+			case View.Y_AXIS:
+				return super.getMinimumSpan(axis);
+			default:
+				throw new IllegalArgumentException("Invalid axis: " + axis);
+			}
+		}
+
+	}
+}

POO/src/standard/ControleurStandard.java

@@ -0,0 +1,326 @@
+package standard;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+
+import javax.swing.JButton;
+import javax.swing.JList;
+import javax.swing.WindowConstants;
+import javax.swing.event.ListSelectionEvent;
+import javax.swing.event.ListSelectionListener;
+
+import communication.tcp.TCPServer;
+import communication.udp.CommunicationUDP;
+import connexion.VueConnexion;
+import database.SQLiteManager;
+import main.Utilisateur;
+import observers.ObserverInputMessage;
+import observers.ObserverSocketState;
+import observers.ObserverUserList;
+import session.VueSession;
+
+public class ControleurStandard implements ActionListener, ListSelectionListener, WindowListener, ObserverInputMessage,
+		ObserverUserList, ObserverSocketState {
+
+	private enum ModifPseudo {
+		TERMINE, EN_COURS
+	}
+
+	private ModifPseudo modifPseudo;
+	private VueStandard vue;
+	private CommunicationUDP commUDP;
+	private String lastPseudo;
+	private TCPServer tcpServ;
+	private ArrayList<String> idsSessionEnCours;
+	private SQLiteManager sqlManager;
+	private VueConnexion vueConnexion;
+
+	public ControleurStandard(VueStandard vue, CommunicationUDP commUDP, int portServerTCP, SQLiteManager sqlManager,
+			VueConnexion vueConnexion) throws IOException {
+		this.vue = vue;
+		this.vue.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
+
+		this.vueConnexion = vueConnexion;
+		
+		this.tcpServ = new TCPServer(portServerTCP);
+	
+		this.tcpServ.addObserver(this);
+		this.tcpServ.start();
+
+		this.commUDP = commUDP;
+		
+		this.idsSessionEnCours = new ArrayList<String>();
+
+		this.sqlManager = sqlManager;
+	}
+
+	// ---------- LISTSELECTION LISTENER OPERATIONS ----------//
+	@Override
+	public void valueChanged(ListSelectionEvent e) {
+
+		// Case when a list element is selected
+		if (this.vue.getActiveUsersList().isFocusOwner() && !e.getValueIsAdjusting()
+				&& this.vue.getActiveUsersList().getSelectedValue() != null) {
+
+			JList<String> list = this.vue.getActiveUsersList();
+			String pseudoOther = list.getSelectedValue();
+			Utilisateur other = this.commUDP.getUserFromPseudo(pseudoOther);
+			String idOther = other.getId();
+
+			// Check if we are already asking for a session/chatting with the person
+			// selected
+			// null condition because the list.clearSelection() generates an event
+			if (!this.idsSessionEnCours.contains(idOther)) {
+
+				int choix = this.vue.displayJOptionSessionCreation(pseudoOther);
+				System.out.println("choix : " + choix);
+
+				if (choix == 0) {
+					
+					
+					int port = other.getPort();
+					
+					
+					System.out.println("port = " + port);
+					try {
+
+						Socket socketComm = new Socket(InetAddress.getLocalHost(), port);
+						
+						this.sendMessage(socketComm, Utilisateur.getSelf().getPseudo());
+						String reponse = this.readMessage(socketComm);
+
+						System.out.println("reponse : " + reponse);
+
+						if (reponse.equals("accepted")) {
+							this.idsSessionEnCours.add(idOther);
+
+							VueSession session = new VueSession(socketComm, idOther, pseudoOther, this.sqlManager);
+							this.vue.addSession(pseudoOther, session);
+
+							this.vue.displayJOptionResponse("acceptee");
+
+						} else {
+							this.vue.displayJOptionResponse("refusee");
+							socketComm.close();
+							System.out.println("refused");
+						}
+
+					} catch (IOException e1) {
+						vue.displayJOptionResponse("refusee");
+					}
+				}
+
+			}
+
+			list.clearSelection();
+			System.out.println("pseudo de la personne a atteindre : " + pseudoOther);
+
+		}
+	}
+
+	// ---------- ACTION LISTENER OPERATIONS ----------//
+	@Override
+	public void actionPerformed(ActionEvent e) {
+
+		// Cas Modifier Pseudo
+		if ((JButton) e.getSource() == this.vue.getButtonModifierPseudo()) {
+			JButton modifierPseudo = (JButton) e.getSource();
+
+			if (this.modifPseudo == ModifPseudo.TERMINE) {
+				this.lastPseudo = Utilisateur.getSelf().getPseudo();
+				modifierPseudo.setText("OK");
+				this.modifPseudo = ModifPseudo.EN_COURS;
+			} else {
+
+				if (this.vue.getDisplayedPseudo().length() >= 1
+						&& !this.commUDP.containsUserFromPseudo(this.vue.getDisplayedPseudo().toLowerCase())) {
+
+					Utilisateur.getSelf().setPseudo(this.vue.getDisplayedPseudo());
+
+					try {
+						this.commUDP.sendMessageInfoPseudo();
+					} catch (IOException e1) {
+						e1.printStackTrace();
+					}
+
+				} else {
+					this.vue.setDisplayedPseudo(this.lastPseudo);
+				}
+
+				modifierPseudo.setText("Modifier");
+				this.modifPseudo = ModifPseudo.TERMINE;
+			}
+
+			this.vue.toggleEditPseudo();
+		}
+
+		// Cas deconnexion
+		else if ((JButton) e.getSource() == this.vue.getButtonDeconnexion()) {
+			try {
+				this.setVueConnexion();
+			} catch (IOException e1) {
+
+				e1.printStackTrace();
+			}
+		}
+
+		else if (this.vue.isButtonTab(e.getSource())) {
+			JButton button = (JButton) e.getSource();
+			int index = this.vue.removeSession(button);
+			this.idsSessionEnCours.remove(index);
+		}
+	}
+
+	// ---------- WINDOW LISTENER OPERATIONS ----------//
+
+	@Override
+	public void windowClosing(WindowEvent e) {
+
+		try {
+			this.setVueConnexion();
+		} catch (IOException e1) {
+			e1.printStackTrace();
+		}
+
+	}
+
+	@Override
+	public void windowOpened(WindowEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void windowClosed(WindowEvent e) {
+
+	}
+
+	@Override
+	public void windowIconified(WindowEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void windowDeiconified(WindowEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void windowActivated(WindowEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void windowDeactivated(WindowEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	// ------------SOCKET-------------//
+
+	private void sendMessage(Socket sock, String message) throws IOException {
+		PrintWriter output = new PrintWriter(sock.getOutputStream(), true);
+		output.println(message);
+	}
+
+	private String readMessage(Socket sock) throws IOException {
+
+		BufferedReader input = new BufferedReader(new InputStreamReader(sock.getInputStream()));
+		return input.readLine();
+	}
+
+	// ------------OBSERVERS------------- //
+
+	@Override
+	public void updateInput(Object o, Object arg) {
+
+		if (o == this.tcpServ) {
+
+			Socket sockAccept = (Socket) arg;
+
+			try {
+
+				String pseudoOther = this.readMessage(sockAccept);
+				String idOther = this.commUDP.getUserFromPseudo(pseudoOther).getId();
+
+				int reponse;
+
+				if (!this.idsSessionEnCours.contains(idOther)) {
+					reponse = this.vue.displayJOptionAskForSession(pseudoOther);
+					System.out.println("reponse : " + reponse);
+				} else {
+					reponse = 1;
+				}
+
+				if (reponse == 0) {
+
+					this.idsSessionEnCours.add(idOther);
+					this.sendMessage(sockAccept, "accepted");
+
+					VueSession session = new VueSession(sockAccept, idOther, pseudoOther, this.sqlManager);
+					this.vue.addSession(pseudoOther, session);
+				} else {
+					this.sendMessage(sockAccept, "refused");
+					sockAccept.close();
+				}
+
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	@Override
+	public void updateList(Object o, ArrayList<Utilisateur> userList) {
+
+		if (o == this.commUDP) {
+			ArrayList<String> pseudos = new ArrayList<String>();
+			for (Utilisateur u : userList) {
+				pseudos.add(u.getPseudo());
+			}
+			this.vue.setActiveUsersList(pseudos);
+		}
+	}
+
+	@Override
+	public void updateSocketState(Object o, Object arg) {
+		VueSession session = (VueSession) arg;
+		int index = this.vue.removeSession(session);
+		this.idsSessionEnCours.remove(index);
+	}
+
+	private void setVueConnexion() throws UnknownHostException, IOException {
+		this.commUDP.sendMessageDelete();
+		this.commUDP.removeAllUsers();
+		this.vue.removeAllUsers();
+		this.vue.closeAllSession();
+		this.idsSessionEnCours.clear();
+		Utilisateur.resetSelf();
+		this.commUDP.setObserver(null);
+
+		this.vue.setVisible(false);
+		this.vueConnexion.setVisible(true);
+	}
+	
+	protected void init() throws UnknownHostException, IOException {
+		this.commUDP.setObserver(this);
+		this.commUDP.sendMessageConnecte();
+		this.commUDP.sendMessageInfoPseudo();
+		this.modifPseudo = ModifPseudo.TERMINE;
+	}
+	
+
+}

POO/src/standard/VueStandard.java

@@ -0,0 +1,373 @@
+package standard;
+
+import java.awt.*;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.io.IOException;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import javax.swing.AbstractButton;
+import javax.swing.BorderFactory;
+import javax.swing.DefaultListModel;
+import javax.swing.JButton;
+import javax.swing.JLabel;
+import javax.swing.JList;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTabbedPane;
+import javax.swing.JTextField;
+import javax.swing.ListSelectionModel;
+import javax.swing.ScrollPaneConstants;
+import javax.swing.plaf.basic.BasicButtonUI;
+
+import communication.udp.CommunicationUDP;
+import connexion.VueConnexion;
+import database.SQLiteManager;
+import main.Utilisateur;
+import main.Vue;
+import session.VueSession;
+
+public class VueStandard extends Vue {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	private JList<String> activeUsersList;
+	private JTextField pseudoSelf;
+	private JTabbedPane zoneSessions;
+	private JButton modifierPseudo;
+	private JButton seConnecter;
+	private JButton seDeconnecter;
+	private ControleurStandard c;
+	private ArrayList<JButton> tabButtons;
+	private ArrayList<VueSession> sessions;
+	private DefaultListModel<String> userList = new DefaultListModel<String>();
+
+	public VueStandard(String title, CommunicationUDP commUDP, int portServerTCP, SQLiteManager sqlManager, VueConnexion vueConnexion) throws IOException {
+		super(title);
+
+		this.tabButtons = new ArrayList<JButton>();
+		this.sessions = new ArrayList<VueSession>();
+		this.c = new ControleurStandard(this, commUDP, portServerTCP, sqlManager, vueConnexion);
+		this.c.init();
+
+		getContentPane().setLayout(new GridBagLayout());
+
+		JPanel left = new JPanel(new BorderLayout());
+
+		this.zoneSessions = new JTabbedPane();
+		this.zoneSessions.setTabPlacement(JTabbedPane.BOTTOM);
+
+		this.zoneSessions.setPreferredSize(new Dimension(600, 600));
+
+		// --------Panel haut pseudo--------//
+		JPanel self = new JPanel(new FlowLayout());
+
+		this.pseudoSelf = new JTextField(Utilisateur.getSelf().getPseudo());
+		this.pseudoSelf.setPreferredSize(new Dimension(100, 30));
+		this.pseudoSelf.setEditable(false);
+		this.pseudoSelf.setFocusable(false);
+		this.pseudoSelf.setEnabled(false);
+
+		this.modifierPseudo = new JButton("Modifier");
+		this.modifierPseudo.addActionListener(this.c);
+
+		self.add(new JLabel("Moi : "));
+		self.add(this.pseudoSelf);
+		self.add(this.modifierPseudo);
+		this.pseudoSelf.addKeyListener(new KeyListener() {
+
+			@Override
+			public void keyTyped(KeyEvent e) {
+			}
+
+			@Override
+			public void keyReleased(KeyEvent e) {
+			}
+
+			@Override
+			public void keyPressed(KeyEvent e) {
+				if (e.getKeyCode() == KeyEvent.VK_ENTER) {
+					modifierPseudo.doClick();
+				}
+			}
+		});
+
+		// --------Panel milieu liste utilisateurs--------//
+		this.activeUsersList = new JList<String>(this.userList);
+		this.activeUsersList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
+		this.activeUsersList.setLayoutOrientation(JList.VERTICAL);
+		this.activeUsersList.addListSelectionListener(this.c);
+
+		System.out.println("listener ajouté");
+
+		JScrollPane listScroller = new JScrollPane(this.activeUsersList);
+		listScroller.setPreferredSize(new Dimension(50, 50));
+		listScroller.setAlignmentX(LEFT_ALIGNMENT);
+		listScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
+		listScroller.setBorder(BorderFactory.createCompoundBorder(
+				BorderFactory.createTitledBorder("Utilisateurs Actifs"), BorderFactory.createEmptyBorder(5, 2, 2, 2)));
+
+		// --------Panel bas deconnexion--------//
+		JPanel deconnexion = new JPanel(new GridLayout(1, 2));
+
+		this.seDeconnecter = new JButton("Se Déconnecter");
+		this.seDeconnecter.addActionListener(this.c);
+		deconnexion.add(this.seDeconnecter);
+		
+		if(Utilisateur.getSelf().getId() == "admin") {
+			JButton addNewUser = new JButton("Ajouter un nouvel utilisateur");
+			deconnexion.add(addNewUser);
+		}
+
+		// --------Ajout à la vue--------//
+		left.add(self, BorderLayout.PAGE_START);
+		left.add(listScroller, BorderLayout.CENTER);
+		left.add(deconnexion, BorderLayout.PAGE_END);
+
+		GridBagConstraints gridBagConstraintLeft = new GridBagConstraints();
+		GridBagConstraints gridBagConstraintSessions = new GridBagConstraints();
+
+		gridBagConstraintLeft.fill = GridBagConstraints.BOTH;
+		gridBagConstraintLeft.gridx = 0;
+		gridBagConstraintLeft.gridy = 0;
+		gridBagConstraintLeft.gridwidth = 1;
+		gridBagConstraintLeft.gridheight = 4;
+		gridBagConstraintLeft.weightx = 0.33;
+		gridBagConstraintLeft.weighty = 1;
+
+		getContentPane().add(left, gridBagConstraintLeft);
+
+		gridBagConstraintSessions.fill = GridBagConstraints.BOTH;
+		gridBagConstraintSessions.gridx = 1;
+		gridBagConstraintSessions.gridy = 0;
+		gridBagConstraintSessions.gridwidth = 2;
+		gridBagConstraintSessions.gridheight = 4;
+		gridBagConstraintSessions.weightx = 0.66;
+		gridBagConstraintSessions.weighty = 1;
+
+		getContentPane().add(this.zoneSessions, gridBagConstraintSessions);
+
+		this.pack();
+		this.setVisible(true);
+
+		this.addWindowListener(c);
+	}
+
+	// ------------ GETTERS -------------//
+
+	protected JList<String> getActiveUsersList() {
+		return this.activeUsersList;
+	}
+
+	protected JButton getButtonModifierPseudo() {
+		return this.modifierPseudo;
+	}
+
+	protected JButton getButtonDeconnexion() {
+		return this.seDeconnecter;
+	}
+
+	protected JButton getButtonConnexion() {
+		return this.seConnecter;
+	}
+
+	protected String getDisplayedPseudo() {
+		return this.pseudoSelf.getText();
+	}
+
+	// ------------ SETTERS -------------//
+
+	protected void setActiveUsersList(ArrayList<String> users) {
+		this.removeAllUsers();
+		this.userList.addAll(users);
+	}
+
+	protected void setDisplayedPseudo(String pseudo) {
+		this.pseudoSelf.setText(pseudo);
+	}
+	
+	public void setPseudoSelf() {
+		this.setDisplayedPseudo(Utilisateur.getSelf().getPseudo());
+	}
+
+	// ------------ JOPTIONS -------------//
+
+	protected int displayJOptionSessionCreation(String pseudo) {
+		return JOptionPane.showConfirmDialog(this, "Voulez vous créer une session avec " + pseudo + " ?",
+				"Confirmation session", JOptionPane.YES_NO_OPTION);
+	}
+
+	protected int displayJOptionAskForSession(String pseudo) {
+		return JOptionPane.showConfirmDialog(this, pseudo + " souhaite creer une session avec vous.",
+				"Accepter demande", JOptionPane.YES_NO_OPTION);
+	}
+
+	protected void displayJOptionResponse(String reponse) {
+		JOptionPane.showMessageDialog(this, "Demande de session " + reponse);
+	}
+
+	// ------------ TOGGLEBUTTONS -------------//
+
+	protected void toggleEditPseudo() {
+		this.pseudoSelf.setEditable(!this.pseudoSelf.isEditable());
+		this.pseudoSelf.setFocusable(!this.pseudoSelf.isFocusable());
+		this.pseudoSelf.setEnabled(!this.pseudoSelf.isEnabled());
+	}
+
+	protected void toggleEnableButtonDeconnexion() {
+		this.seDeconnecter.setEnabled(!this.seDeconnecter.isEnabled());
+	}
+
+	protected void toggleEnableButtonConnexion() {
+		this.seConnecter.setEnabled(!this.seConnecter.isEnabled());
+	}
+
+	// ------------SESSION-------------//
+
+	protected boolean isButtonTab(Object o) {
+		return this.tabButtons.contains(o);
+	}
+
+	protected int removeSession(JButton button) {
+		int index = this.tabButtons.indexOf(button);
+
+		VueSession vue = this.sessions.get(index);
+		vue.destroyAll();
+
+		this.zoneSessions.remove(vue);
+		this.sessions.remove(index);
+		this.tabButtons.remove(index);
+
+		return index;
+	}
+
+	protected void addSession(String pseudo, VueSession session) {
+		JPanel tabTitle = new JPanel();
+
+		TabButton closeTab = new TabButton();
+
+		tabTitle.add(new JLabel(pseudo));
+		tabTitle.add(closeTab);
+
+		this.zoneSessions.addTab(pseudo, session);
+		this.zoneSessions.setTabComponentAt(this.zoneSessions.getTabCount() - 1, tabTitle);
+
+		this.tabButtons.add(closeTab);
+		this.sessions.add(session);
+
+		session.requestFocus();
+
+	}
+	
+	protected synchronized int removeSession(VueSession vue) {
+		int index = this.sessions.indexOf(vue);
+
+		vue.destroyAll();
+
+		this.zoneSessions.remove(vue);
+		this.sessions.remove(index);
+		this.tabButtons.remove(index);
+
+		return index;
+	}
+	
+	protected void closeAllSession() {
+		Iterator<VueSession> it = this.sessions.iterator();
+		while(it.hasNext()) {
+			VueSession session = it.next();
+			this.zoneSessions.remove(session);
+			session.destroyAll();
+			it.remove();
+		}
+		
+		this.tabButtons.clear();
+	}
+
+
+	// ------------ OTHERS -------------//
+
+	protected void removeAllUsers() {
+		this.userList.removeAllElements();
+	}
+	
+	public void initControleur() throws UnknownHostException, IOException {
+		this.c.init();
+	}
+
+	// ------------- PRIVATE CLASSES FOR THE TABS BUTTON -------------//
+	private class TabButton extends JButton {
+		
+		private static final long serialVersionUID = 1L;
+
+		public TabButton() {
+			int size = 17;
+			setPreferredSize(new Dimension(size, size));
+			setToolTipText("close this tab");
+			// Make the button looks the same for all Laf's
+			setUI(new BasicButtonUI());
+			// Make it transparent
+			setContentAreaFilled(false);
+			// No need to be focusable
+			setFocusable(false);
+			setBorder(BorderFactory.createEtchedBorder());
+			setBorderPainted(false);
+
+			addMouseListener(VueStandard.buttonMouseListener);
+			// Making nice rollover effect
+			// we use the same listener for all buttons
+			addActionListener(c);
+			setRolloverEnabled(true);
+		}
+
+		// we don't want to update UI for this button
+		public void updateUI() {
+		}
+
+		// paint the cross
+		protected void paintComponent(Graphics g) {
+			super.paintComponent(g);
+			Graphics2D g2 = (Graphics2D) g.create();
+			// shift the image for pressed buttons
+			if (getModel().isPressed()) {
+				g2.translate(1, 1);
+			}
+			g2.setStroke(new BasicStroke(2));
+			g2.setColor(Color.BLACK);
+			if (getModel().isRollover()) {
+				g2.setColor(Color.MAGENTA);
+			}
+			int delta = 6;
+			g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
+			g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
+			g2.dispose();
+		}
+	}
+
+	private final static MouseListener buttonMouseListener = new MouseAdapter() {
+		public void mouseEntered(MouseEvent e) {
+			Component component = e.getComponent();
+			if (component instanceof AbstractButton) {
+				AbstractButton button = (AbstractButton) component;
+				button.setBorderPainted(true);
+			}
+		}
+
+		public void mouseExited(MouseEvent e) {
+			Component component = e.getComponent();
+			if (component instanceof AbstractButton) {
+				AbstractButton button = (AbstractButton) component;
+				button.setBorderPainted(false);
+			}
+		}
+	};
+
+}

POO_Server/src/communication/CommunicationUDP.java

@@ -0,0 +1,218 @@
+package communication;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+
+import main.Observer;
+import main.Utilisateur;
+
+import messages.*;
+
+
+public class CommunicationUDP extends Thread {
+
+	private UDPClient client;
+	private int portServer;
+	private ArrayList<Integer> portOthers;
+	private ArrayList<Utilisateur> users = new ArrayList<Utilisateur>();
+
+	private Observer observer;
+
+	public CommunicationUDP(int portClient, int portServer, int[] portsOther) throws IOException {
+		this.portServer = portServer;
+		this.portOthers = this.getArrayListFromArray(portsOther);
+		new UDPServer(portServer, this).start();
+		this.client = new UDPClient(portClient);
+	}
+	
+
+	private ArrayList<Integer> getArrayListFromArray(int ports[]) {
+		ArrayList<Integer> tmp = new ArrayList<Integer>();
+		for (int port : ports) {
+			tmp.add(port);
+		}
+		tmp.remove(Integer.valueOf(portServer));
+
+		return tmp;
+	}
+	
+	
+	// ----- CHECKERS ----- //
+	
+	protected boolean containsUserFromID(String id) {
+		for(Utilisateur u : users) {
+			if(u.getId().equals(id) ) {
+				return true;
+			}
+		}
+		return false;
+	}
+	
+	
+	public boolean containsUserFromPseudo(String pseudo) {
+		for(Utilisateur u : users) {
+			if(u.getPseudo().equals(pseudo) ) {
+				return true;
+			}
+		}
+		
+		return false;
+	}
+	
+	
+	// ----- GETTERS ----- //
+	
+	public int getPortFromPseudo(String pseudo) {
+		for(int i=0; i < users.size() ; i++) {
+			
+			if(users.get(i).getPseudo().equals(pseudo) ) {
+				return users.get(i).getPort();
+			}
+		}
+		return -1;
+	}
+	
+	private int getIndexFromID(String id) {
+		for(int i=0; i < users.size() ; i++) {
+			if(users.get(i).getId().equals(id) ) {
+				return i;
+			}
+		}
+		return -1;
+	}
+	
+	public Utilisateur getUserFromID(String id) {
+		for(Utilisateur u : users) {
+			if(u.getId().equals(id) ) {
+				return u;
+			}
+		}
+		return null;
+	}
+	
+	public Observer getObserver () {
+		return this.observer;
+	}
+	
+	
+	// ----- SETTERS ----- //
+	
+	public void setObserver (Observer obs) {
+		this.observer=obs;
+	}
+	
+	
+	
+	
+	// ----- USER LIST MANAGEMENT ----- //
+	
+	//Prints a html table containing the pseudo of all active local users
+	 public void printActiveUsersUDP(PrintWriter out) {
+		    for (Utilisateur uIn : users) {
+		    	out.println("<TH> " + uIn.getPseudo() + ",</TH>");
+		    }
+	    }
+	
+	//Add an user to the list of active local users
+	protected synchronized void addUser(String idClient, String pseudoClient, InetAddress ipClient, int port) throws IOException {
+		users.add(new Utilisateur(idClient, pseudoClient, ipClient, port));
+		try {
+			Message message = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, idClient, pseudoClient, port);
+			observer.update(this, message);
+		} catch (MauvaisTypeMessageException e) {
+		}		
+	}
+	
+	//Change the pseudo of an user already in the active local users list
+	protected synchronized void changePseudoUser(String idClient, String pseudoClient, InetAddress ipClient, int port) {
+		int index = getIndexFromID(idClient);
+		users.get(index).setPseudo(pseudoClient);
+		try {
+			Message message = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, idClient, pseudoClient, port);
+			observer.update(this, message);
+		} catch (MauvaisTypeMessageException e) {
+		}
+	}
+
+	//Remove an user from the active local users list
+	protected synchronized void removeUser(String idClient, String pseudoClient,InetAddress ipClient, int port) {
+		int index = getIndexFromID(idClient);
+		if( index != -1) {
+			users.remove(index);
+		}
+		try {
+			Message message = new MessageSysteme(Message.TypeMessage.JE_SUIS_DECONNECTE, pseudoClient,  idClient, port);
+			observer.update(this, message);
+		} catch (MauvaisTypeMessageException e) {
+		}
+	}
+	
+	//Remove all users from the active local users list
+	public void removeAll(){
+		int oSize = users.size();
+		for(int i=0; i<oSize;i++) {
+			users.remove(0);
+		}
+	}
+	
+	
+	// ----- SENDING MESSAGES ----- //
+	
+	
+	// Send the message "add,id,pseudo" to localhost on all the ports in
+	// "portOthers"
+	// This allows the receivers' agent (portOthers) to create or modify an entry with the
+	// data of this agent
+	//Typically used to notify of a name change
+	public void sendMessageInfoPseudo() throws UnknownHostException, IOException {
+
+		Utilisateur self = Utilisateur.getSelf();
+		
+		String pseudoSelf =self.getPseudo();
+		String idSelf = self.getId();
+		int portSelf = self.getPort();
+		
+		Message msout = null;
+		try {
+			msout = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, pseudoSelf, idSelf, portSelf);
+			for(int port : this.portOthers) {
+				this.client.sendMessageUDP_local(msout, port, InetAddress.getLocalHost());
+			}
+		} catch (Exception e) {
+		}
+	}
+	
+	//Same, but on only one port
+	//Typically used to give your current name and id to a newly arrived host
+	public void sendMessageInfoPseudo(int portOther) throws UnknownHostException, IOException {
+	
+		Utilisateur self = Utilisateur.getSelf();
+		try {
+			Message msout = new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, self.getPseudo(), self.getId(), self.getPort());
+			this.client.sendMessageUDP_local(msout, portOther, InetAddress.getLocalHost());
+		} catch (MauvaisTypeMessageException e) {e.printStackTrace();}
+	}
+
+	
+	//Broadcast a given message on the local network (here modelized by ports)
+	public void sendMessage(Message m) {
+		try {
+			for(int port : this.portOthers) {
+				this.client.sendMessageUDP_local(m, port, InetAddress.getLocalHost());
+			}
+		} catch (IOException e) {
+		}
+	}
+	
+	//Send a given message to a specific user (here, by port)
+	public void sendMessage(Message m, int port) {
+		try {
+			this.client.sendMessageUDP_local(m, port, InetAddress.getLocalHost());
+		} catch (IOException e) {
+		}
+	}
+
+}

POO_Server/src/communication/UDPClient.java

@@ -0,0 +1,62 @@
+package communication;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+//import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import messages.*;
+
+public class UDPClient {
+
+	private DatagramSocket sockUDP;
+	//private InetAddress broadcast;
+	
+	
+	/**
+	 * Create an UDP client on the specified port. It will be used to notify the
+	 * other users of this application's user state (Connected/Disconnected/Pseudo
+	 * changed).
+	 * 
+	 * @param port
+	 * @throws SocketException
+	 * @throws UnknownHostException
+	 */
+	public UDPClient(int port) throws SocketException, UnknownHostException {
+		this.sockUDP = new DatagramSocket(port);
+	}
+	
+	
+	/**
+	 * Send a message to the specified port on localhost.
+	 * 
+	 * @param message
+	 * @param port
+	 * @throws IOException
+	 */
+	protected void sendMessageUDP_local(Message message, int port, InetAddress clientAddress) throws IOException {
+		String messageString= message.toString();
+		DatagramPacket outpacket = new DatagramPacket(messageString.getBytes(), messageString.length(), clientAddress, port);
+		this.sockUDP.send(outpacket);
+		
+	}
+	
+	/**
+	 * Send a message to the given address on the specified port.
+	 * 
+	 * @param message
+	 * @param port
+	 * @param clientAddress
+	 * @throws IOException
+	 */
+	private void sendMessageUDP(Message message, int port, InetAddress clientAddress) throws IOException {
+		String messageString = message.toString();
+		DatagramPacket outpacket = new DatagramPacket(messageString.getBytes(), messageString.length(), clientAddress,
+				port);
+		this.sockUDP.send(outpacket);
+	}
+	
+}

POO_Server/src/communication/UDPServer.java

@@ -0,0 +1,86 @@
+package communication;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.SocketException;
+
+import main.Utilisateur;
+import messages.*;
+
+
+
+public class UDPServer extends Thread {
+
+	private DatagramSocket sockUDP;
+	private CommunicationUDP commUDP;
+	private byte[] buffer;
+
+	
+	/**
+	 * Create an UDP Server on the specified port. It will be used to read the
+	 * other users states (Connected/Disconnected/Pseudo).
+	 * 
+	 * @param port
+	 * @param commUDP
+	 * @throws SocketException
+	 */
+	public UDPServer(int port, CommunicationUDP commUDP) throws SocketException {
+		this.commUDP = commUDP;
+		this.sockUDP = new DatagramSocket(port);
+		this.buffer = new byte[256];
+	}
+
+	@Override
+	public void run() {
+		while (true) {
+
+			try {
+				
+				DatagramPacket inPacket = new DatagramPacket(buffer, buffer.length);
+				this.sockUDP.receive(inPacket);
+				String msgString = new String(inPacket.getData(), 0, inPacket.getLength());
+				Message msg = Message.stringToMessage(msgString);
+
+				switch(msg.getTypeMessage()) {
+				case JE_SUIS_CONNECTE :	
+					
+					if(Utilisateur.getSelf() != null) {
+						//System.out.println("first co");
+						int portClient = inPacket.getPort();
+						int portServer = portClient+1;
+						
+						this.commUDP.sendMessageInfoPseudo(portServer);
+						this.commUDP.getObserver().update(this, portServer);
+					}
+					
+					
+					break;
+					
+				case INFO_PSEUDO :
+					
+
+					if (this.commUDP.containsUserFromID(((MessageSysteme) msg).getId())) {
+						this.commUDP.changePseudoUser(((MessageSysteme) msg).getId(), ((MessageSysteme) msg).getPseudo(), inPacket.getAddress(),((MessageSysteme) msg).getPort()); 
+					}
+					else {
+						
+						this.commUDP.addUser(((MessageSysteme) msg).getId(), ((MessageSysteme) msg).getPseudo(), inPacket.getAddress(), ((MessageSysteme) msg).getPort() );
+						System.out.println(((MessageSysteme) msg).getId()+", "+((MessageSysteme) msg).getPseudo());
+					}
+					break;
+					
+				case JE_SUIS_DECONNECTE :
+					this.commUDP.removeUser( ((MessageSysteme) msg).getId() , ((MessageSysteme) msg).getPseudo(), inPacket.getAddress(), inPacket.getPort());
+					break;
+					
+				default : //Others types of messages are ignored because they are supposed to be transmitted by TCP and not UDP
+				}
+
+			} catch (IOException e) {
+				System.out.println("receive exception");
+			}
+
+		}
+	}
+}

POO_Server/src/main/Observer.java

@@ -0,0 +1,6 @@
+package main;
+
+public interface Observer {
+
+	public void update(Object o, Object arg);
+}

POO_Server/src/main/ServletPresence.java

@@ -0,0 +1,323 @@
+package main;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import communication.CommunicationUDP;
+import messages.*;
+
+/**
+ * Servlet implementation class ServletPresence
+ */
+@WebServlet("/ServletPresence")
+
+
+public class ServletPresence extends HttpServlet implements Observer {
+	private static final long serialVersionUID = 1L;
+	
+	private CommunicationUDP comUDP;
+	private ArrayList<Utilisateur> remoteUsers;
+	private String[] registeredRemoteUsers = {"user1","user2","user3"};
+	
+    public ServletPresence() {
+        try {
+			comUDP = new CommunicationUDP(3333, 3334, new int[] {2209, 2309, 2409, 2509, 3334});
+		} catch (IOException e) {
+		}
+        comUDP.setObserver(this);
+        remoteUsers = new ArrayList<Utilisateur>();
+        try {
+			Utilisateur.setSelf("serv_p", "Serveur de presence", "localhost", 3334);
+		} catch (UnknownHostException e) {
+		}
+    }
+    
+    
+    // ----- REMOTE USER LIST MANAGEMENT ----- //
+
+    private int getIndexByID(String id) {
+    	for(int i=0; i < remoteUsers.size() ; i++) {
+			if(remoteUsers.get(i).getId().equals(id) ) {
+				return i;
+			}
+		}
+		return -1;
+    }
+    
+    private boolean remoteContainsUserFromPseudo(String pseudo) {
+    	for(Utilisateur u : remoteUsers) {
+			if(u.getPseudo().equals(pseudo) ) {
+				return true;
+			}
+    	}
+    	return false;
+    }
+    
+    
+    // ----- HTML PRINT METHODS ----- //
+    
+  //Affiche la liste des utilisateurs actifs
+    private void printActiveUsers(PrintWriter out) {
+	    out.println( "<TABLE>" );
+	    out.println("<TH>Utilisateurs connectés : </TH>");
+	    for (Utilisateur uExt : remoteUsers) {
+	    	out.println("<TH> " + uExt.getPseudo() + ",</TH>");
+	    }
+	    comUDP.printActiveUsersUDP(out);
+	    out.println( "</TABLE>" );
+    }
+    
+    //Affiche la liste des utilisateurs actifs, seule sur la page
+    private void printActiveUsersOnly(PrintWriter out) {
+    	out.println( "<HTML>" );
+	    out.println( "<HEAD>");
+	    out.println( "<TITLE>Serveur de présence</TITLE>" );
+	    out.println( "</HEAD>" );
+	    out.println( "<BODY>" );
+	    printActiveUsers(out);
+	    out.println( "</BODY>" );
+	    out.println( "</HTML>" );
+    }
+    
+    //Affiche la page d'accueil
+    private void printHomePage(PrintWriter out) {
+    	out.println( "<HTML>" );
+	    out.println( "<HEAD>");
+	    out.println( "<TITLE>Serveur de présence - Accueil</TITLE>" );
+	    out.println( "</HEAD>" );
+	    out.println( "<BODY>" );
+	    out.println( "<H1>Bienvenue sur le service de connexion à distance</H1>" );
+	    out.println( "<H2>Vous pouvez taper votre requête dans la barre de navigation</H2>" );
+	    out.println( "<H2>Requêtes (à ajouter derrière l'URL) : </H2>" );
+	    out.println( "<H3>Se connecter : ?type=POST&id=[votre id]&pseudo=[pseudo voulu]&port=[port utilisé] </H3>" );
+	    out.println( "<H3>Se déconnecter : ?type=DELETE&id=[votre id] </H3>" );
+	    out.println( "<H3>Changer de pseudo : ?type=PUT&id=[votre id]&pseudo=[pseudo voulu] </H3>" );
+	    out.println( "<H3>Rafraîchir la liste des utilisateurs : ?type=GET" );
+	    out.println( "</BODY>" );
+	    out.println( "</HTML>" );
+    }
+    
+    //Affiche un message d'erreur en cas de pseudo déjà utilisé
+    private void printErrorUsedPseudo(PrintWriter out){
+    	out.println( "<HTML>" );
+		out.println( "<HEAD>");
+		out.println( "<TITLE>Erreur pseudo déjà utilisé</TITLE>" );
+		out.println( "</HEAD>" );
+		out.println( "<BODY>" );
+		out.println( "<H1>Erreur : Ce pseudo est déjà utilisé</H1>" );
+		out.println( "<H2>Veuillez choisir un autre pseudo</H2>" );
+		out.println( "</BODY>" );
+		printActiveUsers(out);
+		out.println( "</HTML>" );
+    }
+    
+    //Affiche un message d'erreur en cas de requête invalide
+    private void printErrorInvalidRequest(PrintWriter out) {
+    	out.println( "<HTML>" );
+	    out.println( "<HEAD>");
+	    out.println( "<TITLE>Erreur requête invalide</TITLE>" );
+	    out.println( "</HEAD>" );
+	    out.println( "<BODY>" );
+	    out.println( "<H1>Erreur : nous n'avons pas compris votre requête</H1>" );
+	    out.println( "<H2>Veuillez vérifier votre syntaxe et réessayer</H2>" );
+	    out.println( "</BODY>" );
+	    out.println( "</HTML>" );
+    }
+    
+    //Affiche un message d'erreur en cas d'id inconnue
+    private void printErrorUnkwownUser(PrintWriter out) {
+    	out.println( "<HTML>" );
+	    out.println( "<HEAD>");
+	    out.println( "<TITLE>Erreur Utilisateur Inconnu</TITLE>" );
+	    out.println( "</HEAD>" );
+	    out.println( "<BODY>" );
+	    out.println( "<H1>Erreur : l'id que vous avez entrée n'est pas enregistrée</H1>" );
+	    out.println( "<H2>Veuillez vérifier votre syntaxe et réessayer</H2>" );
+	    out.println( "</BODY>" );
+	    out.println( "</HTML>" );
+    }
+    
+    
+    // ----- NOTIFY METHOD ----- //
+    
+    //Informe de la modification de la liste tous les utilisateurs internes et externes : appelée automatiquement à chaque modification de la liste
+    private void snotify(MessageSysteme message, Utilisateur user) {
+    	if (remoteUsers.contains(user)) {
+    		//diffuse le message localement, envoie la nouvelle liste des utilisateurs aux utilisateurs externes SAUF L'EXPEDITEUR
+    		comUDP.sendMessage(message);
+    		for (Utilisateur u : remoteUsers) {
+    			if (!u.equals(user)) {
+    				comUDP.sendMessage(message, u.getPort());
+    			}
+    		}
+    	}
+    	else {
+    		//envoie la nouvelle liste des utilisateurs aux utilisateurs externes
+    		for (Utilisateur u : remoteUsers) {
+    			comUDP.sendMessage(message, u.getPort());
+    		}
+    	}
+    }
+
+    
+    
+    // ----- HTTP METHODS ----- //
+    
+  // susbribe/unsubscribe : Permet a un utilisateur externe de s'ajouter/s'enlever à la liste des utilisateurs externes : au tout début de l'application
+	//Note : le serveur agit comme un proxy pour le TCP et remplace le port de l'utilisateur par le sien
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		String id = request.getParameter("id");
+		String pseudo = request.getParameter("pseudo");
+		int port = Integer.parseInt(request.getParameter("port"));
+		InetAddress ip = InetAddress.getByName(request.getRemoteAddr());
+		
+		response.setContentType( "text/html" );
+		PrintWriter out = response.getWriter();
+		
+		//Si l'id n'existe pas dans la BDD : génère du html pour en informer l'utilisateur
+		try {
+			if (!Arrays.asList(registeredRemoteUsers).contains(id)) {
+				printErrorUnkwownUser(out);
+			}
+			
+			//Si le pseudo est déjà pris : idem
+			else if (comUDP.containsUserFromPseudo(pseudo)||remoteContainsUserFromPseudo(pseudo)) {
+				printErrorUsedPseudo(out);
+			}
+			
+			//Sinon
+			else {
+				Utilisateur user = new Utilisateur(id, pseudo, ip, port);
+				remoteUsers.add(user);
+				try {
+					snotify(new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, pseudo, id, 3334), user);
+				} catch (MauvaisTypeMessageException e) {
+					// TODO Auto-generated catch block
+					e.printStackTrace();
+				}
+				printActiveUsersOnly(out);
+			}
+		} catch (UnknownHostException e) {
+		}
+		out.close();
+	}
+	
+	protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
+		String id = request.getParameter("id");
+		int index = getIndexByID(id);
+    	Utilisateur user = remoteUsers.get(index);
+    	try {
+			snotify(new MessageSysteme(Message.TypeMessage.JE_SUIS_DECONNECTE,"", id, 3334), user);
+		} catch (MauvaisTypeMessageException e) {
+		}
+    	remoteUsers.remove(index);
+    	response.setContentType( "text/html" );
+	    PrintWriter out = response.getWriter();
+	    printHomePage(out);
+	    out.close();
+	}
+
+    //Permet de dire si on a changé de pseudo (pour les utilisateurs externes)
+	protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
+		String id = request.getParameter("id");
+		String pseudo = request.getParameter("pseudo");
+		int index = getIndexByID(id);
+		
+		response.setContentType( "text/html" );
+		PrintWriter out = response.getWriter();
+		
+		//Si le pseudo est déjà pris : génère du html pour en informer l'utilisateur
+		if (comUDP.containsUserFromPseudo(pseudo)||remoteContainsUserFromPseudo(pseudo)) {
+			printErrorUsedPseudo(out);
+		}
+		
+		else {
+			Utilisateur user = remoteUsers.get(index);
+			user.setPseudo(pseudo);
+			try {
+				snotify(new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, pseudo, id, 3334), user);
+			} catch (MauvaisTypeMessageException e) {
+			}
+			printActiveUsersOnly(out);
+		}
+		out.close();
+	}
+	
+	//Méthode générale, embranche vers l'une au l'autre des méthodes HTTP (à défaut d'une "vraie" interface)
+	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
+
+		try {
+			String type= request.getParameter("type");
+		
+			switch(type) {
+				case "POST" :
+					doPost(request, response);
+					break;
+					
+				case "DELETE" :
+					doDelete(request, response);
+					break;
+					
+				case "PUT" :
+					doPut(request, response);
+					break;
+					
+				case "GET" :
+					//Met à jour la liste des utilisateurs affichée
+					PrintWriter out1 = response.getWriter();
+				    printActiveUsersOnly(out1);
+				    out1.close();
+					
+				//génère une jolie page
+				default :
+					response.setContentType( "text/html" );
+				    PrintWriter out = response.getWriter();
+				    printErrorInvalidRequest(out);
+				    out.close();
+			}
+		} 
+		//Si pas d'argument type : page d'accueil
+		catch (java.lang.NullPointerException e) {
+			response.setContentType( "text/html" );
+		    PrintWriter out = response.getWriter();
+		    printHomePage(out);
+		    out.close();
+			
+		}
+	}
+	
+	// ----- OBSERVER METHOD ----- //
+	
+	@Override
+	//Note : on part du principe que pour les communications TCP et autres, le serveur agira comme un proxy et donc que les 
+	//utilisateurs externes n'ont pas besoin de connaitre les ip internes des machines
+	
+	public void update(Object o, Object arg) {
+		// pour transmettre aux utilisateurs externes les modifications internes
+		if (arg instanceof MessageSysteme) {
+			MessageSysteme message = (MessageSysteme) arg;
+			snotify(message, comUDP.getUserFromID(message.getId()));
+		}
+		//pour transmettre la liste des utilisateurs externes aux nouveaux arrivants internes
+		if (arg instanceof Integer) {
+			int port = (int)arg;
+			for (Utilisateur u : remoteUsers) {
+	    		try {
+					comUDP.sendMessage(new MessageSysteme(Message.TypeMessage.INFO_PSEUDO, u.getPseudo(), u.getId(), u.getPort()), port);
+				} catch (MauvaisTypeMessageException e) {
+				}
+	    	}
+		}
+	}
+
+}

POO_Server/src/main/Utilisateur.java

@@ -0,0 +1,115 @@
+package main;
+import java.io.Serializable;
+import java.net.*;
+
+public class Utilisateur implements Serializable{
+
+
+	private static final long serialVersionUID = 1L;
+	
+	private String id;
+	private String pseudo;
+	private InetAddress ip;
+	private int port;
+	
+	//Represents the user that is currently using the application
+	private static Utilisateur self;
+	
+	
+	/**
+	 * Create and initialize an object representing an user
+	 * 
+	 * @param id : user id as String
+	 * @param pseudo : name under which other users can see this user as String
+	 * @param ip : ip of the device this user is currently using as InetAddress
+	 * @param port : on local mode, port used for the TCP listen socket as int
+	 * 
+	 */
+	public Utilisateur(String id, String pseudo, InetAddress ip, int port) throws UnknownHostException {
+		this.id = id;
+		this.pseudo = pseudo;
+		this.ip = ip;
+		this.port = port;
+
+	}
+	
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns user id as String
+	 * 
+	 * @return user id as String
+	 */
+	public String getId() {
+		return id;
+	}
+
+	/**
+	 * Returns user pseudo as String
+	 * 
+	 * @return user pseudo as String
+	 */
+	public String getPseudo() {
+		return pseudo;
+	}
+	
+	/**
+	 * Returns user device's ip as String
+	 * 
+	 * @return user device's ip as String
+	 */
+	public InetAddress getIp() {
+		return ip;
+	}
+	
+	/**
+	 * Returns the port the user uses for their TCP listen socket as int
+	 * 
+	 * @return TCP listen socket port as int
+	 */
+	public int getPort() {
+		return port;
+	}
+	
+	/**
+	 * Returns the user currently using this instance of the application as Utilisateur
+	 * 
+	 * @return current user as Utilisateur
+	 */	
+	public static Utilisateur getSelf() {
+		return Utilisateur.self;
+	}
+	
+	
+	// ----- SETTERS ----- //
+
+	/**
+	 * Change the pseudo used by an user
+	 * 
+	 * @param pseudo : new pseudo as String
+	 */	
+	public void setPseudo(String pseudo) {
+		this.pseudo = pseudo;
+	}
+	
+	/**
+	 * Sets the self static attribute with a new Utilisateur
+	 * 
+	 * @param id : user id as String
+	 * @param pseudo : name under which other users can see this user as String
+	 * @param ip : ip of the device this user is currently using as InetAddress
+	 * @param port : on local mode, port used for the TCP listen socket as int
+	 */	
+	public static void setSelf(String id, String pseudo, String host, int port) throws UnknownHostException {
+		if(Utilisateur.self == null) {
+			Utilisateur.self = new Utilisateur(id, pseudo, InetAddress.getByName(host), port);
+		}
+	}
+	
+	/**
+	 * Sets the self static attribute with null
+	 */
+	public static void resetSelf() {
+		Utilisateur.self = null;
+	}
+}

POO_Server/src/messages/MauvaisTypeMessageException.java

@@ -0,0 +1,8 @@
+package messages;
+
+public class MauvaisTypeMessageException extends Exception {
+
+	private static final long serialVersionUID = 1L;
+
+
+}

POO_Server/src/messages/Message.java

@@ -0,0 +1,130 @@
+package messages;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public abstract class Message implements Serializable {
+
+	public enum TypeMessage {JE_SUIS_CONNECTE, JE_SUIS_DECONNECTE, INFO_PSEUDO, TEXTE, IMAGE, FICHIER, FICHIER_INIT, FICHIER_ANSWER}
+	protected TypeMessage type;
+	private String dateMessage;
+	private String sender;
+	private static final long serialVersionUID = 1L;
+	
+	
+	
+	// ------- GETTERS ------ //
+	
+	/**
+	 * Returns the current date and time as a string using DateTimeFormatter and LocalDateTime
+	 * 
+	 * @return date and time as a String
+	 */
+	public static String getDateAndTime() {
+		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
+		LocalDateTime now = LocalDateTime.now();
+		return dtf.format(now);
+	}
+	
+	/**
+	 * Returns the type of the message
+	 * 
+	 * @return message type as TypeMessage
+	 */
+	public TypeMessage getTypeMessage() {
+		return this.type;
+	}
+	
+	/**
+	 * Returns the date and time to which the message was timestamped
+	 * 
+	 * @return date and time of timestamp as String
+	 */
+	public String getDateMessage() {
+		return this.dateMessage;
+	}
+	
+	/**
+	 * Returns the sender of the message (used in the database)
+	 * 
+	 * @return sender of message as String
+	 */
+	public String getSender() {
+		return this.sender ;
+	}
+	
+
+	
+	// ------ SETTERS ------ //
+	
+	/**
+	 * Set the date of the message to a specific timestamp
+	 * 
+	 * @param timestamp as (formatted) String
+	 */
+	public void setDateMessage(String dateMessage) {
+		this.dateMessage = dateMessage;
+	}
+	
+	/**
+	 * Set the sender of the message to a specified string
+	 * 
+	 * @param sender pseudo as String
+	 */
+	public void setSender(String sender) {
+		this.sender = sender;
+	}	
+	
+	
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+
+	/**
+	 * Returns a string representing the formatted list of attributes
+	 * 
+	 *@return attributes as a String
+	 */
+	protected abstract String attributsToString();
+
+	/**
+	 * Returns the message as a formatted string
+	 * 
+	 *@return message as a String
+	 */
+	public String toString() {
+		return this.type+"###"+this.attributsToString();
+	}	
+
+	/**
+	 * Static method. Returns a message obtainer by parsing a given string
+	 * 
+	 *@param String representing a message
+	 *@return Message
+	 */
+	public static Message stringToMessage(String messageString) {
+		try {
+			String[] parts = messageString.split("###");
+			switch (parts[0]) {
+			case "JE_SUIS_CONNECTE" :
+				return new MessageSysteme(TypeMessage.JE_SUIS_CONNECTE);
+				
+			case "JE_SUIS_DECONNECTE" :
+				return new MessageSysteme(TypeMessage.JE_SUIS_DECONNECTE, parts[1], parts[2], Integer.parseInt(parts[3]) );
+				
+			case "INFO_PSEUDO" :
+				return new MessageSysteme(TypeMessage.INFO_PSEUDO, parts[1], parts[2], Integer.parseInt(parts[3]) );
+				
+			case "TEXTE" :
+				return new MessageTexte(TypeMessage.TEXTE, parts[1]);
+				
+			case "IMAGE" :
+				return new MessageFichier(TypeMessage.IMAGE, parts[1], parts[2]);
+				
+			case "FICHIER" :
+				return new MessageFichier(TypeMessage.FICHIER, parts[1], parts[2]);
+			}
+		} catch (MauvaisTypeMessageException e) {}
+			return null;
+	}
+
+}

POO_Server/src/messages/MessageFichier.java

@@ -0,0 +1,82 @@
+package messages;
+
+public class MessageFichier extends Message {
+	
+
+	private static final long serialVersionUID = 1L;
+	private String contenu;
+	private String extension;
+
+	/**
+	 * Create a file message. These message are used for all interactions regarding file transfer.
+	 * 
+	 * The "FICHIER_INIT" messages are used to inform the recipient application that you wish to transfer them files.
+	 * The "FICHIER_ANSWER" messages are answers to "FICHIER_INIT" messages. They indicate that you are ready to receive the file.
+	 * The "contenu" argument then contains the port on which you wish to receive the files.
+	 * 
+	 * The "FICHIER" messages contains the files themselves.
+	 * The "IMAGE" messages contains images files, which means the application will display a thumbnail for the image to the recipient.
+	 * 
+	 * @param TypeMessage type (must be FICHIER_INIT, FICHIER_ANSWER, FICHIER or IMAGE, else an error is raised)
+	 * @param contenu : message content as String
+	 * @param extension : file extension as string
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageFichier(TypeMessage type, String contenu, String extension) throws MauvaisTypeMessageException{
+		if ((type==TypeMessage.IMAGE)||(type==TypeMessage.FICHIER) ||(type==TypeMessage.FICHIER_INIT) || (type==TypeMessage.FICHIER_ANSWER) ) {
+			this.type=type;
+			this.contenu=contenu;
+			this.extension=extension;
+			this.setDateMessage(Message.getDateAndTime());
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+
+	// ----- GETTERS ----- //
+	
+	
+	/**
+	 * Returns content of the message
+	 * 
+	 * @return content as String
+	 */
+	public String getContenu() {
+		return this.contenu;
+	}
+	
+	/**
+	 * Returns extension of the file contained in the message (if the message contains a file)
+	 * 
+	 * @return extension as String
+	 */
+	public String getExtension() {
+		return this.extension;
+	}
+
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */	
+	@Override
+	protected String attributsToString() {
+		return this.contenu+"###"+this.extension;
+	}
+	
+	public String toString() {
+		if(this.type == TypeMessage.IMAGE) {
+			return this.contenu;
+		}else {
+			String suffixe;
+			if(this.getSender().equals("Moi")) {
+				suffixe = "envoyé\n";
+			}else {
+				suffixe = "reçu\n";
+			}
+			return "<"+this.getDateMessage()+"> : "+this.contenu+" "+suffixe;
+		}
+	}
+}

POO_Server/src/messages/MessageSysteme.java

@@ -0,0 +1,96 @@
+package messages;
+
+public class MessageSysteme extends Message {
+	
+	private static final long serialVersionUID = 1L;
+	private String pseudo;
+	private String id;
+	private int port;
+
+	// ------ CONSTRUCTORS ------ //
+	
+	/**
+	 * Create a system message. These message are used for all system interactions by the UDP channel.
+	 * The "JE_SUIS_CONNECTE" messages are used to inform the network that you just joined.
+	 * They are sent directly after an user log in, and await multiple "INFO_PSEUDO" messages as answers, to build the table of users logged in.
+	 * 
+	 * @param TypeMessage type (must be JE_SUIS_CONNECTE, else an error is raised)
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageSysteme(TypeMessage type) throws MauvaisTypeMessageException{
+		if (type==TypeMessage.JE_SUIS_CONNECTE) {
+			this.type=type;
+			this.pseudo="";
+			this.id="";
+			this.port = -1;
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+	
+	/**
+	 * Create a system message. These message are used for all system interactions by the UDP channel.
+	 * The "JE_SUIS_DECONNECTE" messages are used to inform the network that you just quit it.
+	 * 
+	 * The "INFO_PSEUDO" are used to give informations about you to another user, much like an business card.
+	 * They are used either as an answer to a "JE_SUIS_CONNECTE" message or to inform the network of a change of pseudo.
+	 * 
+	 * @param TypeMessage type (must be JE_SUIS_DECONNECTE or INFO_PSEUDO, else an error is raised)
+	 * @param pseudo : user pseudo as String
+	 * @param id : user id as String
+	 * @param port : "server" UDP port used by the application (used when the application id in local mode)
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageSysteme(TypeMessage type, String pseudo, String id, int port) throws MauvaisTypeMessageException {
+		if (type==TypeMessage.INFO_PSEUDO ||(type==TypeMessage.JE_SUIS_DECONNECTE)) {
+			this.type=type;
+			this.pseudo=pseudo;
+			this.id=id;
+			this.port = port;
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+	
+	
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns pseudo of the sender of the message (when type == INFO_PSEUDO)
+	 * 
+	 * @return user pseudo as String
+	 */
+	public String getPseudo() {
+		return this.pseudo;
+	}
+	
+	/**
+	 * Returns id of the sender of the message (when type == INFO_PSEUDO)
+	 * 
+	 * @return user id as String
+	 */
+	public String getId() {
+		return this.id;
+	}
+
+	/**
+	 * Returns the "server" UDP port used by the sender of the message
+	 * 
+	 * @return port as integer
+	 */
+	public int getPort() {
+		return this.port;
+	}
+	
+	
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */
+	@Override
+	protected String attributsToString() {
+		return this.pseudo+"###"+this.id+"###"+this.port;
+	}
+}

POO_Server/src/messages/MessageTexte.java

@@ -0,0 +1,55 @@
+package messages;
+
+public class MessageTexte extends Message {
+	
+
+	private static final long serialVersionUID = 1L;
+	private String contenu;
+	
+
+	/**
+	 * Create a text message. These message are used for basic text conversation via TCP.
+	 * 
+	 * @param TypeMessage type (must be TEXT, else an error is raised)
+	 * @param contenu : message content as String
+	 * 
+	 * @throws MauvaisTypeMessageException
+	 */
+	public MessageTexte(TypeMessage type, String contenu) throws MauvaisTypeMessageException{
+		if (type==TypeMessage.TEXTE) {
+			this.type=type;
+			this.contenu=contenu;
+			this.setDateMessage(Message.getDateAndTime());
+		}
+		else throw new MauvaisTypeMessageException();
+	}
+
+	// ----- GETTERS ----- //
+	
+	/**
+	 * Returns content of the message
+	 * 
+	 * @return content as String
+	 */	
+	public String getContenu() {
+		return this.contenu;
+	}
+	
+
+	// ----- MESSAGE-STRING CONVERSION METHODS -------//
+	
+	/**
+	 * Implements attributsToString method of Message
+	 * 
+	 * @return attributes as a String
+	 */	
+	@Override
+	protected String attributsToString() {
+		return this.contenu;
+	}
+	
+	@Override
+	public String toString() {
+		return "<"+this.getDateMessage()+"> "+this.getSender()+" : "+this.contenu+"\n";
+	}
+}

README.md

@@ -1,20 +1,3 @@
 # Projet_COO_POO
 
 Projet de 4ème année : Conception et programmation orientée objet d'un systeme de clavardage distribué interactif multi-utilisateur temps réel 
-
-Contenu (branche master):
-
-Dossier rapports : rapports de conception et de projet
-
-Dossier application : archives .jar permettant d'exécuter l'application (version classique)
-
-Dossier serveur_presence : archives .jar et .war permettant d'exécuter respectivement l'application (version compatible avec le serveur) et le serveur de présence
-
-
-Pour récupérer les codes sources :
-
-- De l'application classique : branche application
-
-- Du serveur et de l'application modifiée : branche serveur_presence (l'application est dans le projet POO, le servlet dans le projet POO_Server) 
-
-Toutes les autres branches concernent des versions obsolètes de l'application, merci de ne pas en tenir compte.