add messenger

Author: mikebarkmin

archives/messenger-tui/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+lib
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

archives/messenger-tui/.idea/.gitignore

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+import cipher.CaesarCipher;
+import cipher.Cipher;
+import cipher.VigenereCipher;
+import utils.List;
+
+import javax.swing.*;
+import java.util.Date;
+import java.util.Random;
+import java.util.Scanner;
+
+public class App {
+    private String username;
+    private Cipher cipher;
+    private String secretKey;
+    private List<Message> messages;
+    private List<Contact> contacts;
+    private Scanner scanner;
+
+
+    public App(String pUsername) {
+        this.username = pUsername;
+        this.messages = new List<>();
+        this.contacts = new List<>();
+
+        scanner = new Scanner(System.in);
+        System.out.println("Welche Verschlüsselung möchtest du verwenden? [C]aesar oder [V]igenere");
+        String c = scanner.nextLine();
+        System.out.println("Gib bitte den Schlüssel ein.");
+        this.secretKey = scanner.nextLine();
+
+        // SETUP
+        if(c.equals("C")) {
+            this.cipher = new CaesarCipher();
+        } else if (c.equals("V")) {
+            this.cipher = new VigenereCipher();
+        } else {
+            System.out.println(c + " ist keine valide Option. Bitte gebe C oder V ein");
+            System.exit(1);
+        }
+
+        // HAUPTMENÜ
+        while(true) {
+            System.out.println("== HAUPTMENÜ ==");
+            System.out.println("[1] Nachrichten anzeigen");
+            System.out.println("[2] Nachricht senden");
+            System.out.println("[99] Fake Nachricht empfangen");
+            System.out.println("[0] Beenden");
+
+            int option = scanner.nextInt();
+            scanner.nextLine(); // nextInt scannt keine neue Zeile. Ohne diese Anweisung würde das nächste gewollte nextLine nicht funktionieren.
+            if (option == 1) {
+                this.showMessages();
+            } else if (option == 2) {
+                this.sendMessage();
+            } else if (option == 3) {
+                break;
+            } else if (option == 99) {
+                this.receiveFakeMessage();
+            }
+            System.out.println();
+        }
+    }
+
+    public static void main(String[] args) {
+        new App("glados");
+    }
+
+    /**
+     * Diese Methode bekommt eine Netzwerknachricht der Form:
+     * zeitstempel§username§text
+     * z.B.: "1698698068301§ada§Hallo das ist ein Test :)"
+     */
+    public void receive(String pNetworkMessage) {
+        // Teilt die Nachricht an den ersten beiden §-Zeichen auf.
+        String[] parts = pNetworkMessage.split("§", 3);
+        long time = Long.parseLong(parts[0]);
+        String username = parts[1];
+        String text = parts[2];
+
+        Message message = new Message(username, text, time);
+        // speichere die Nachricht an der nächsten freien Stelle
+        this.messages.append(message);
+    }
+
+    /**
+     * Diese Methode soll aus einem übergebenen Text eine Netzwerknachricht
+     * erstellen und diese zurückgeben.
+     * Die Nachricht wird im Array messages gespeichert.
+     */
+    public String send(String pText) {
+        long time = new Date().getTime();
+        // verschlüsseln bevor die Nachricht speichert wird
+        pText = this.cipher.verschluesseln(secretKey, pText);
+        Message message = new Message(username, pText, time);
+
+        // speichere die Nachricht an der nächsten freien Stelle
+        this.messages.append(message);
+
+        return time + "§" + username + "§" + pText;
+    }
+
+    public void showMessages() {
+        System.out.println("== NACHRICHTEN ==");
+        messages.toFirst();
+        while(messages.hasAccess()) {
+            System.out.println(messages.getContent().toString(this.cipher, this.secretKey));
+            messages.next();
+        }
+        System.out.println();
+    }
+
+    public void sendMessage() {
+        System.out.println("== NACHRICHT SENDEN ==");
+        System.out.println("Text: ");
+        String text = scanner.nextLine();
+        this.send(text);
+        System.out.println();
+    }
+
+    public void receiveFakeMessage() {
+
+        String[] usernames = {"froggy", "fresh", "robo", "mr-zero", "ms-one"};
+        int usernameIndex = new Random().nextInt(usernames.length);
+        String username = usernames[usernameIndex];
+
+        String[] texts = {"Testnachricht 1", "Testnachricht 2", "Testnachricht 3", "Testnachricht \uD83D\uDE07"};
+        int textIndex = new Random().nextInt(texts.length);
+        String text = texts[textIndex];
+        text = this.cipher.verschluesseln(secretKey, text);
+        long time = new Date().getTime();
+        String message = time + "§" + username + "§" + text;
+        this.receive(message);
+    }
+
+    public void showNotification() {
+
+    }
+}

archives/messenger-tui/.idea/misc.xml

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+
+public class Contact {
+    private String id;
+    private String name;
+    private String profilePicturePath;
+
+    public Contact(String pId, String pName, String pProfilePicturePath) {
+        id = pId;
+        name = pName;
+        profilePicturePath = pProfilePicturePath;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getProfilePicturePath() {
+        return profilePicturePath;
+    }
+
+    public void setProfilePicturePath(String newProfilePicturePath) {
+        profilePicturePath = newProfilePicturePath;
+    }
+
+    public void setName(String newName) {
+        name = newName;
+    }
+}

archives/messenger-tui/.idea/modules.xml

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+import cipher.Cipher;
+
+import java.util.Date;
+
+public class Message {
+    private String username;
+    private String text;
+    private Date date;
+
+
+    public Message(String pUsername, String pText, long pTime) {
+        this.username = pUsername;
+        this.text = pText;
+        this.date = new Date(pTime);
+    }
+
+    public Message(String pUsername, String pText, Date pDate) {
+        this.username = pUsername;
+        this.text = pText;
+        this.date = pDate;
+    }
+
+    public String getUserName() {
+        return username;
+    }
+
+    public String getText() {
+        return text;
+    }
+
+    public Date getDate() {
+        return date;
+    }
+
+    public String toString(Cipher pCipher, String pSchluessel) {
+        return this.date.toString() 
+            + " - " 
+            + this.username 
+            + ": " 
+            + pCipher.entschluesseln(pSchluessel, text);
+    }
+}

archives/messenger-tui/src/App.java

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+package cipher;
+
+public class CaesarCipher extends Cipher {
+    
+    public String entschluesseln(String pSchluessel, String pText) {
+        String d = "";
+        char key = pSchluessel.charAt(0);
+        for (int i = 0; i < pText.length(); i++) {
+            int c = pText.charAt(i) + key;
+            d += (char) c;
+        }
+        
+        return d;
+    }
+    
+    
+    public String verschluesseln(String pSchluessel, String pText) {
+        String d = "";
+        char key = pSchluessel.charAt(0);
+        for (int i = 0; i < pText.length(); i++) {
+            int c = pText.charAt(i) - key;
+            d += (char) c;
+        }
+        
+        return d;
+    }
+}

archives/messenger-tui/src/Contact.java

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+package cipher;
+
+public abstract class Cipher
+{
+
+    public abstract String verschluesseln(String pSchluessel, String pText);
+    public abstract String entschluesseln(String pSchluessel, String pText);
+}