Add argument to load/store Garmin SSO data

README.md

@@ -58,6 +58,7 @@ usage: gcexport.py [-h] [--version] [-v] [--username USERNAME]
                    [-f {gpx,tcx,original,json}] [-d DIRECTORY] [-s SUBDIR]
                    [-lp LOGPATH] [-u] [-ot] [--desc [DESC]] [-t TEMPLATE]
                    [-fp] [-sa START_ACTIVITY_NO] [-ex FILE]
+                   [-ss DIRECTORY]
 
 Garmin Connect Exporter
 
@@ -96,6 +97,8 @@ optional arguments:
   -ex FILE, --exclude FILE
                         JSON file with Array of activity IDs to exclude from download.
                         Format example: {"ids": ["6176888711"]}
+  -ss DIRECTORY, --session DIRECTORY
+                        enable loading and storing SSO information from/to given directory
 ```
 
 ### Examples

gcexport.py

@@ -473,6 +473,8 @@ def parse_arguments(argv):
         help='give index for first activity to import, i.e. skipping the newest activities')
     parser.add_argument('-ex', '--exclude', metavar='FILE',
         help='JSON file with Array of activity IDs to exclude from download. Format example: {"ids": ["6176888711"]}')
+    parser.add_argument('-ss', '--session', metavar='DIRECTORY',
+        help='enable loading and storing SSO information from/to given directory')
     # fmt: on
 
     return parser.parse_args(argv[1:])
@@ -484,10 +486,40 @@ def login_to_garmin_connect(args):
     """
     username = args.username if args.username else input('Username: ')
     password = args.password if args.password else getpass()
+    garth_session_directory = args.session if args.session else None
 
     print('Authenticating using OAuth...', end=' ')
     try:
-        garth.login(username, password)
+        login_required = False
+
+        # try to load data if a session directory is given
+        if garth_session_directory:
+            try:
+                garth.resume(garth_session_directory)
+            except Exception:
+                # error during loading the session, a new login is required
+                login_required = True
+                pass
+            try:
+                garth.client.username
+            except Exception:
+                # session expired, a new login is required
+                login_required = True
+                pass
+        else:
+            login_required = True
+
+        if login_required:
+            garth.login(username, password)
+
+            # try to store data if a session directory is given
+            if garth_session_directory:
+                try:
+                    garth.save(garth_session_directory)
+                except Exception:
+                    print('Unable to store session data to ' + garth_session_directory)
+                    pass
+
     except Exception as ex:
         raise GarminException(f'Authentication failure ({ex}). Did you enter correct credentials?') from ex
     print(' Done.')