Set config flag for --force-edmc-protocol so protocol.py can test it

EDMarketConnector.py

@@ -111,6 +111,15 @@ if __name__ == '__main__':  # noqa: C901
     if args.force_localserver_for_auth:
         config.set_auth_force_localserver()
 
+    if args.force_edmc_protocol:
+        if sys.platform == 'win32':
+            config.set_auth_force_edmc_protocol()
+
+        else:
+            print("--force-edmc-protocol is only valid on Windows")
+            parser.print_help()
+            exit(1)
+
     def handle_edmc_callback_or_foregrounding() -> None:  # noqa: CCR001
         """Handle any edmc:// auth callback, else foreground existing window."""
         logger.trace('Begin...')

config.py

@@ -182,6 +182,7 @@ class AbstractConfig(abc.ABC):
 
     __in_shutdown = False  # Is the application currently shutting down ?
     __auth_force_localserver = False  # Should we use localhost for auth callback ?
+    __auth_force_edmc_protocol = False  # Should we force edmc:// protocol ?
 
     def __init__(self) -> None:
         self.home_path = pathlib.Path.home()
@@ -212,6 +213,19 @@ class AbstractConfig(abc.ABC):
         """
         return self.__auth_force_localserver
 
+    def set_auth_force_edmc_protocol(self):
+        """Set flag to force use of localhost web server for Frontier Auth callback."""
+        self.__auth_force_edmc_protocol = True
+
+    @property
+    def auth_force_edmc_protocol(self) -> bool:
+        """
+        Determine if use of localhost is forced for Frontier Auth callback.
+
+        :return: bool - True if we should use localhost web server.
+        """
+        return self.__auth_force_edmc_protocol
+
     @property
     def app_dir(self) -> str:
         """Return a string version of app_dir."""