implement user and login

obj/user.py

@@ -0,0 +1,87 @@
+import sqlite3
+import os
+
+class User:
+    def __init__(self, user_id, name, email, password):
+        self._user_id = user_id
+        self._name = name
+        self._email = email
+        self._password = password
+        self._db_path = os.path.join("db", "user.db")
+
+    # Getter
+    def get_id(self):
+        return self._user_id
+
+    def get_name(self):
+        return self._name
+
+    def get_email(self):
+        return self._email
+
+    def get_password(self):
+        return self._password
+
+    # Setter
+    def set_name(self, name):
+        self._name = name
+        self._update_db()
+
+    def set_email(self, email):
+        self._email = email
+        self._update_db()
+
+    def set_password(self, password):
+        self._password = password
+        self._update_db()
+
+    def _update_db(self):
+        """Update the user's data in the DB"""
+        with sqlite3.connect(self._db_path) as conn:
+            c = conn.cursor()
+            c.execute('UPDATE users SET name = ?, email = ?, password = ? WHERE id = ?',
+                      (self._name, self._email, self._password, self._user_id))
+            conn.commit()
+
+    def save_to_db(self):
+        """Speichert den aktuellen Benutzer in die Datenbank (Insert oder Update)"""
+        with sqlite3.connect(self._db_path) as conn:
+            c = conn.cursor()
+            c.execute("SELECT id FROM users WHERE id = ?", (self._user_id,))
+            if c.fetchone():
+                # Benutzer existiert bereits → aktualisieren
+                c.execute('UPDATE users SET name = ?, email = ?, password = ? WHERE id = ?',
+                        (self._name, self._email, self._password, self._user_id))
+            else:
+                # Neuer Benutzer → einfügen
+                c.execute('INSERT INTO users (id, name, email, password) VALUES (?, ?, ?, ?)',
+                        (self._user_id, self._name, self._email, self._password))
+            conn.commit()
+
+
+    @staticmethod
+    def authenticate_user(username, password):
+        """Prüft, ob ein Benutzer mit E-Mail + Passwort existiert"""
+        db_path = os.path.join("db", "user.db")
+        with sqlite3.connect(db_path) as conn:
+            c = conn.cursor()
+            c.execute("SELECT id, name, email FROM users WHERE name = ? AND password = ?", (username, password))
+            result = c.fetchone()
+            if result:
+                user_id, name, email = result
+                return User(user_id, name, email, password)
+            return None
+        
+    @staticmethod
+    def validate_user(username, userid):
+        """Prüft, ob ein Benutzer mit E-Mail + Passwort existiert"""
+        db_path = os.path.join("db", "user.db")
+        with sqlite3.connect(db_path) as conn:
+            c = conn.cursor()
+            c.execute("SELECT id, name, email FROM users WHERE name = ? AND id = ?", (username, userid))
+            result = c.fetchone()
+            if result:
+                user_id, name, email= result
+                return True
+            return None
+