Transfer the generation of the auth link into its own function

The authentication link should be prepended with a logoff link from
mycloud, if it is requested. In order to make this process testable
this commit separates the generation of the authentication link,
based on whether it requests for a browser logoff first, into its
own function.

This commit also adds tests for this function.

CURA-7427

cura/OAuth2/AuthorizationService.py

@@ -3,7 +3,7 @@
 
 import json
 from datetime import datetime, timedelta
-from typing import Optional, TYPE_CHECKING
+from typing import Optional, TYPE_CHECKING, Dict
 from urllib.parse import urlencode, quote_plus
 
 import requests.exceptions
@@ -24,6 +24,7 @@ if TYPE_CHECKING:
     from cura.OAuth2.Models import UserProfile, OAuth2Settings
     from UM.Preferences import Preferences
 
+MYCLOUD_LOGOFF = "https://mycloud.ultimaker.com/logoff"
 
 ##  The authorization service is responsible for handling the login flow,
 #   storing user credentials and providing account information.
@@ -142,7 +143,7 @@ class AuthorizationService:
             self.onAuthStateChanged.emit(logged_in = False)
 
     ##  Start the flow to become authenticated. This will start a new webbrowser tap, prompting the user to login.
-    def startAuthorizationFlow(self, force_logout_from_mycloud = False) -> None:
+    def startAuthorizationFlow(self, force_browser_logout: bool = False) -> None:
         Logger.log("d", "Starting new OAuth2 flow...")
 
         # Create the tokens needed for the code challenge (PKCE) extension for OAuth2.
@@ -153,8 +154,8 @@ class AuthorizationService:
 
         state = AuthorizationHelpers.generateVerificationCode()
 
-        # Create the query string needed for the OAuth2 flow.
-        query_string = urlencode({
+        # Create the query dict needed for the OAuth2 flow.
+        query_parameters_dict = {
             "client_id": self._settings.CLIENT_ID,
             "redirect_uri": self._settings.CALLBACK_URL,
             "scope": self._settings.CLIENT_SCOPES,
@@ -162,7 +163,7 @@ class AuthorizationService:
             "state": state,  # Forever in our Hearts, RIP "(.Y.)" (2018-2020)
             "code_challenge": challenge_code,
             "code_challenge_method": "S512"
-        })
+        }
 
         # Start a local web server to receive the callback URL on.
         try:
@@ -173,18 +174,25 @@ class AuthorizationService:
                     title=i18n_catalog.i18nc("@info:title", "Warning")).show()
             return
 
-        # Open the authorization page in a new browser window. If a force logout is requested during the authorization
-        # flow, the "mycloud logoff" link will be prepended to the authorization url to make sure that the user will be
-        # logged off from the browser before being redirected to login again. This case is used to sync the accounts
-        # between Cura and the browser.
-        auth_url = "{}?{}".format(self._auth_url, query_string)
-        if force_logout_from_mycloud:
-            mycloud_logoff_link = "https://mycloud.ultimaker.com/logoff"
-            logoff_auth_url = "{}?next={}".format(mycloud_logoff_link, quote_plus(auth_url))
-            QDesktopServices.openUrl(QUrl(logoff_auth_url))
-        else:
-            QDesktopServices.openUrl(QUrl(auth_url))
+        auth_url = self._generate_auth_url(query_parameters_dict, force_browser_logout)
+        # Open the authorization page in a new browser window.
+        QDesktopServices.openUrl(QUrl(auth_url))
 
+    def _generate_auth_url(self, query_parameters_dict: Dict[str, str], force_browser_logout: bool) -> str:
+        """
+        Generates the authentications url based on the original auth_url and the query_parameters_dict to be included.
+        If there is a request to force logging out of mycloud in the browser, the link to logoff from mycloud is
+        prepended in order to force the browser to logoff from mycloud and then redirect to the authentication url to
+        login again. This case is used to sync the accounts between Cura and the browser.
+        :param query_parameters_dict:
+        :param force_browser_logout:
+        :return:
+        """
+        auth_url = "{}?{}".format(self._auth_url, urlencode(query_parameters_dict))
+        if force_browser_logout:
+            # The url after '?next=' should be urlencoded
+            auth_url = "{}?next={}".format(MYCLOUD_LOGOFF, quote_plus(auth_url))
+        return auth_url
 
     ##  Callback method for the authentication flow.
     def _onAuthStateChanged(self, auth_response: AuthenticationResponse) -> None:

tests/TestOAuth2.py

@@ -7,7 +7,7 @@ from PyQt5.QtGui import QDesktopServices
 
 from UM.Preferences import Preferences
 from cura.OAuth2.AuthorizationHelpers import AuthorizationHelpers, TOKEN_TIMESTAMP_FORMAT
-from cura.OAuth2.AuthorizationService import AuthorizationService
+from cura.OAuth2.AuthorizationService import AuthorizationService, MYCLOUD_LOGOFF
 from cura.OAuth2.LocalAuthorizationServer import LocalAuthorizationServer
 from cura.OAuth2.Models import OAuth2Settings, AuthenticationResponse, UserProfile
 
@@ -226,3 +226,19 @@ def test_wrongServerResponses() -> None:
     with patch.object(AuthorizationHelpers, "parseJWT", return_value=UserProfile()):
         authorization_service._onAuthStateChanged(MALFORMED_AUTH_RESPONSE)
     assert authorization_service.getUserProfile() is None
+
+
+def test__generate_auth_url() -> None:
+    preferences = Preferences()
+    authorization_service = AuthorizationService(OAUTH_SETTINGS, preferences)
+    query_parameters_dict = {
+        "client_id": "",
+        "redirect_uri": OAUTH_SETTINGS.CALLBACK_URL,
+        "scope": OAUTH_SETTINGS.CLIENT_SCOPES,
+        "response_type": "code"
+    }
+    auth_url = authorization_service._generate_auth_url(query_parameters_dict, force_browser_logout = False)
+    assert MYCLOUD_LOGOFF + "?next=" not in auth_url
+
+    auth_url = authorization_service._generate_auth_url(query_parameters_dict, force_browser_logout = True)
+    assert MYCLOUD_LOGOFF + "?next=" in auth_url