如何在现有 PyQt5 应用程序中正确添加 OAuth2 弹出窗口

Question

我对 PyQt 还很陌生，我已经设法通过使用 Qt Designer 组合一个工作应用程序来摸索自己的方式。但是，我需要添加一个 OAuth2 流来登录特定服务，但我无法让它适应我现有的应用程序。

我在 Github (https://github.com/alonraiz/QT-OAuth-Example) 中找到了一个处理 PyQt5/OAuth2 登录的好例子——只要我独立运行它。我现在正在尝试集成它，以便在用户选择特定菜单项时弹出它......我遇到了麻烦。

默认代码使用这个：

    app = QApplication(sys.argv)
    browser = LoginWindow(app)

由于我已经有一个应用程序，所以我尝试调用：

    browser = LoginWindow(app)

使用我现有的应用程序对象。然后让我遇到这个错误： QCoreApplication::exec: 事件循环已经在运行

这似乎是有道理的。所以我删除了这个：

        sys.exit(app.exec_())

然后我什么也得不到。

根据我有限的 PyQt5 经验，我确定我的做法完全错误......

这是一个说明我现在所处位置的示例。感谢任何帮助！

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

import sys
from urllib.parse import urlencode, parse_qs
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWebEngineCore import QWebEngineUrlRequestInterceptor
from PyQt5.QtCore import QUrl
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QApplication


"""
login   anxious-elephant@example.com
password    Frantic-Magpie-Tame-Cow-9
"""

ClientId = '0oamu4rr08hdGKd9u0h7'
RedirectUrl = 'www.oauth.com/playground/authorization-code.html'
RedirectScheme = 'https://'
Scopes = ['photo offline_access']

ResponseType = 'code'

Headers = {'client_id': ClientId, 'redirect_uri': RedirectScheme+RedirectUrl, 'response_type': ResponseType,
           'scope': str.join(' ', Scopes), 'state': 'RT6TfGb4jEWbz7SI'}

AuthUrl = 'https://dev-396343.oktapreview.com/oauth2/default/v1/authorize?{headers}'.format(
    headers=urlencode(Headers))


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(234, 167)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 234, 22))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionLogin = QtWidgets.QAction(MainWindow)
        self.actionLogin.setObjectName("actionLogin")
        self.menuFile.addAction(self.actionLogin)
        self.menubar.addAction(self.menuFile.menuAction())

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.actionLogin.setText(_translate("MainWindow", "Login"))


class RequestInterceptor(QWebEngineUrlRequestInterceptor):
    def __init__(self, app):
        super(RequestInterceptor, self).__init__()
        self.app = app

    def interceptRequest(self, info):
        if RedirectUrl == (info.requestUrl().host()+info.requestUrl().path()):
            params = parse_qs(info.requestUrl().query())
            if 'code' in params.keys():
                print('OAuth code is {code}'.format(code=params['code']))
                self.app.quit()
                # return params['code']


class LoginWindow(QWebEngineView):
    logged_in = QtCore.pyqtSignal(['QString'])

    def __init__(self, app):
        super(LoginWindow, self).__init__()
        self.nam = self.page()
        self.app = app
        self.setUrl(QUrl(AuthUrl))
        self.show()
        self.loadFinished.connect(self._loadFinished)
        interceptor = RequestInterceptor(app)
        self.page().profile().setUrlRequestInterceptor(interceptor)
        # This needs enabled to get the working example running:
        # sys.exit(app.exec_())

    def _loadFinished(self, result):
        self.page().toHtml(self.callable)

    def callable(self, data):
        self.html = data


class MainMenu(Ui_MainWindow):
    def __init__(self, dialog, mainapp):
        global fn
        Ui_MainWindow.__init__(self)
        self.setupUi(dialog)
        self.actionLogin.triggered.connect(self.login)
        self.mainapp = mainapp

    def login(self):
        print("login")
        browser = LoginWindow(self.mainapp)


if __name__ == "__main__":
    # This doesn't work
    app = QtWidgets.QApplication(sys.argv)
    menu = QtWidgets.QMainWindow()
    prog = MainMenu(menu, app)
    menu.show()
    sys.exit(app.exec_())

    # This works:
    # app = QApplication(sys.argv)
    # browser = LoginWindow(app)

我想做的是让 OAuth 流作为主应用程序的弹出窗口工作，而不是一个独立的应用程序（或者让两个应用程序和平共处）。

Answer 1

我建议您阅读 PyQt5⁽¹⁾ 文档，以便了解如何使用 Qt Designer 生成的类。考虑到上述情况，解决方案是继承自QMainWindow，使用Qt Designer类作为接口类。拦截器对象是一个局部变量，也会产生问题，所以不发生，把窗口作为父级传递。

综合以上情况，解决办法是：

from urllib.parse import urlencode, parse_qs

from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineCore, QtWebEngineWidgets


"""
login   anxious-elephant@example.com
password    Frantic-Magpie-Tame-Cow-9
"""

ClientId = "0oamu4rr08hdGKd9u0h7"
RedirectUrl = "www.oauth.com/playground/authorization-code.html"
RedirectScheme = "https://"
Scopes = ["photo offline_access"]

ResponseType = "code"

Headers = {
    "client_id": ClientId,
    "redirect_uri": RedirectScheme + RedirectUrl,
    "response_type": ResponseType,
    "scope": str.join(" ", Scopes),
    "state": "RT6TfGb4jEWbz7SI",
}

AuthUrl = "https://dev-396343.oktapreview.com/oauth2/default/v1/authorize?{headers}".format(
    headers=urlencode(Headers)
)


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(234, 167)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 234, 22))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionLogin = QtWidgets.QAction(MainWindow)
        self.actionLogin.setObjectName("actionLogin")
        self.menuFile.addAction(self.actionLogin)
        self.menubar.addAction(self.menuFile.menuAction())

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.actionLogin.setText(_translate("MainWindow", "Login"))


class RequestInterceptor(QtWebEngineCore.QWebEngineUrlRequestInterceptor):
    codeChanged = QtCore.pyqtSignal(str)

    def interceptRequest(self, info):
        if RedirectUrl == (info.requestUrl().host() + info.requestUrl().path()):
            params = parse_qs(info.requestUrl().query())
            if "code" in params.keys():
                code = params["code"][0][0]
                print("OAuth code is {code}".format(code=params["code"][0][0]))
                self.codeChanged.emit(code)


class LoginWindow(QtWebEngineWidgets.QWebEngineView):
    codeChanged = QtCore.pyqtSignal(str)

    def __init__(self, parent=None):
        super(LoginWindow, self).__init__(parent)
        self.setUrl(QtCore.QUrl(AuthUrl))
        self.loadFinished.connect(self._loadFinished)
        interceptor = RequestInterceptor(self)
        self.page().profile().setUrlRequestInterceptor(interceptor)
        self.show()

        self.interceptor.codeChanged.connect(self.codeChanged)

    @QtCore.pyqtSlot(bool)
    def _loadFinished(self, result):
        self.page().toHtml(self.callable)

    def callable(self, data):
        self.html = data


class MainMenu(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainMenu, self).__init__(parent)
        self.setupUi(self)
        self.actionLogin.triggered.connect(self.login)

        lay = QtWidgets.QVBoxLayout(self.centralwidget)
        self.code_label = QtWidgets.QLabel(alignment=QtCore.Qt.AlignCenter)
        lay.addWidget(self.code_label)

    @QtCore.pyqtSlot()
    def login(self):
        self.browser = LoginWindow()
        self.browser.codeChanged.connect(self.onCodeChanged)

    @QtCore.pyqtSlot(str)
    def onCodeChanged(self, code):
        self.code_label.setText(code)
        # self.browser.close()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    menu = MainMenu()
    menu.show()
    sys.exit(app.exec_())

^{(1)Using the Generated Code}