Add argument to login to Instaloader

src/instawebhooks/__main__.py

@@ -15,7 +15,7 @@
 try:
     from aiohttp import ClientSession
     from discord import Embed, File, SyncWebhook
-    from instaloader.exceptions import LoginRequiredException
+    from instaloader.exceptions import LoginException, LoginRequiredException
     from instaloader.instaloader import Instaloader
     from instaloader.structures import Post, Profile
 except ModuleNotFoundError as exc:
@@ -45,6 +45,22 @@
 else:
     logger.setLevel(logging.INFO)
 
+if args.login or args.interactive_login:
+    logger.info("Logging into Instagram...")
+    try:
+        if args.login:
+            Instaloader().login(*args.login)
+        if args.interactive_login:
+            Instaloader().interactive_login(args.interactive_login)
+    except LoginException as login_exc:
+        logger.critical("instaloader: error: %s", login_exc)
+        raise SystemExit(
+            "An error happened during login. Check if the provided username exists."
+        ) from login_exc
+    except KeyboardInterrupt:
+        print("\nLogin interrupted by user.")
+        sys.exit(0)
+
 # Log the start of the program
 logger.info("Starting InstaWebhooks...")
 
@@ -207,7 +223,7 @@ def main():
     except LoginRequiredException as login_exc:
         logger.critical("instaloader: error: %s", login_exc)
         raise SystemExit(
-            "Not logged into Instaloader.\n  instaloader --login YOUR-USERNAME"
+            "Not logged in. Please login with the --login flag."
         ) from login_exc
     except KeyboardInterrupt:
         print("\nInterrupted by user.")

src/instawebhooks/parser.py

@@ -29,7 +29,8 @@ def closure_check_regex(arg_value: str):
     ),
     epilog="https://github.com/RaenLua/InstaWebhooks",
 )
-group = parser.add_mutually_exclusive_group()
+logging_group = parser.add_mutually_exclusive_group()
+login_group = parser.add_mutually_exclusive_group()
 parser.add_argument(
     "instagram_username",
     help="the Instagram username to monitor for new posts",
@@ -42,12 +43,32 @@ def closure_check_regex(arg_value: str):
         r"^.*(discord|discordapp)\.com\/api\/webhooks\/([\d]+)\/([a-zA-Z0-9_.-]*)$"
     ),
 )
-group.add_argument("-q", "--quiet", help="hide all logging", action="store_true")
-group.add_argument("-v", "--verbose", help="show debug logging", action="store_true")
+logging_group.add_argument(
+    "-q", "--quiet", help="hide all logging", action="store_true"
+)
+logging_group.add_argument(
+    "-v", "--verbose", help="show debug logging", action="store_true"
+)
+login_group.add_argument(
+    "-l",
+    "--login",
+    metavar=("USERNAME", "PASSWORD"),
+    type=str,
+    help="login to instagram with username and password",
+    nargs=2,
+)
+login_group.add_argument(
+    "-t",
+    "--interactive-login",
+    metavar="USERNAME",
+    type=str,
+    help="login to instagram with username and ask for password on terminal",
+)
 parser.add_argument(
     "-p",
     "--catchup",
     help="send the last latest posts on startup regardless of time",
+    metavar="POSTS",
     type=int,
     default=0,
 )