Secure PyQt5 Login Widget with Credential Saving Feature using Keyring

PyQt5_LoginWidget_with_Credentials_Saving.py

import sys
from PyQt5 import QtWidgets, QtCore
import keyring

class LoginWidget(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.load_credentials()

    def initUI(self):
        self.setWindowTitle('Login')

        self.layout = QtWidgets.QVBoxLayout()

        # Username field
        self.username = QtWidgets.QLineEdit(self)
        self.username.setPlaceholderText('Username')
        self.layout.addWidget(self.username)

        # Password field
        self.password = QtWidgets.QLineEdit(self)
        self.password.setPlaceholderText('Password')
        self.password.setEchoMode(QtWidgets.QLineEdit.EchoMode.Password)
        self.layout.addWidget(self.password)

        # Checkbox for saving credentials
        self.save_credentials = QtWidgets.QCheckBox('Save credentials', self)
        self.layout.addWidget(self.save_credentials)

        # Login button
        self.login_button = QtWidgets.QPushButton('Login', self)
        self.login_button.clicked.connect(self.handle_login)
        self.layout.addWidget(self.login_button)

        self.setLayout(self.layout)

    def load_credentials(self):
        # Attempt to load the username; use a fixed key or identifier for the username
        saved_username = keyring.get_password('MyApp', 'saved_username')
        
        if saved_username:
            # If there's a saved username, attempt to load the corresponding password
            saved_password = keyring.get_password('MyApp', saved_username)
            if saved_password:
                self.username.setText(saved_username)
                self.password.setText(saved_password)
                self.save_credentials.setChecked(True)

    def handle_login(self):
        username = self.username.text()
        password = self.password.text()

        if self.save_credentials.isChecked():
            # Save the username using a fixed key or identifier
            keyring.set_password('MyApp', 'saved_username', username)
            # Save the password using the username as the key
            keyring.set_password('MyApp', username, password)
            print("Credentials saved.")
        else:
            # Optionally, clear the saved credentials if the checkbox is not checked
            keyring.delete_password('MyApp', 'saved_username')
            keyring.delete_password('MyApp', username)
            print("Credentials not saved.")

        # Add your login verification logic here
        print(f"Attempting to login with username: {username} and password: {password}")

        # Clear fields after login attempt (optional)
        self.username.clear()
        self.password.clear()

def main():
    app = QtWidgets.QApplication(sys.argv)
    login_widget = LoginWidget()
    login_widget.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()