Add CLI option for credential file auth to kit-ilias-web

CHANGELOG.md

@@ -24,6 +24,7 @@ ambiguous situations.
 
 ### Added
 - `credential-file` authenticator
+- `--credential-file` option for `kit-ilias-web` command
 
 ### Fixed
 - Date parsing now also works correctly in non-group exercises

PFERD/__main__.py

@@ -5,7 +5,7 @@ import os
 import sys
 from pathlib import Path
 
-from .cli import PARSER, load_default_section
+from .cli import PARSER, ParserLoadError, load_default_section
 from .config import Config, ConfigDumpError, ConfigLoadError, ConfigOptionError
 from .logging import log
 from .pferd import Pferd, PferdLoadError
@@ -36,6 +36,9 @@ def load_config(args: argparse.Namespace) -> Config:
         log.error(str(e))
         log.error_contd(e.reason)
         sys.exit(1)
+    except ParserLoadError as e:
+        log.error(str(e))
+        sys.exit(1)
 
 
 def configure_logging_from_args(args: argparse.Namespace) -> None:

PFERD/cli/__init__.py

@@ -1,11 +1,12 @@
 # isort: skip_file
 
 # The order of imports matters because each command module registers itself
-# with the parser from ".parser". Because of this, isort is disabled for this
+# with the parser from ".parser" and the import order affects the order in
+# which they appear in the help. Because of this, isort is disabled for this
 # file. Also, since we're reexporting or just using the side effect of
 # importing itself, we get a few linting warnings, which we're disabling as
 # well.
 
 from . import command_local  # noqa: F401 imported but unused
 from . import command_kit_ilias_web  # noqa: F401 imported but unused
-from .parser import PARSER, load_default_section  # noqa: F401 imported but unused
+from .parser import PARSER, ParserLoadError, load_default_section  # noqa: F401 imported but unused

PFERD/cli/command_kit_ilias_web.py

@@ -4,7 +4,8 @@ from pathlib import Path
 
 from ..crawl.ilias.file_templates import Links
 from ..logging import log
-from .parser import CRAWLER_PARSER, SUBPARSERS, BooleanOptionalAction, load_crawler, show_value_error
+from .parser import (CRAWLER_PARSER, SUBPARSERS, BooleanOptionalAction, ParserLoadError, load_crawler,
+                     show_value_error)
 
 SUBPARSER = SUBPARSERS.add_parser(
     "kit-ilias-web",
@@ -38,6 +39,12 @@ GROUP.add_argument(
     action=BooleanOptionalAction,
     help="use the system keyring to store and retrieve passwords"
 )
+GROUP.add_argument(
+    "--credential-file",
+    type=Path,
+    metavar="PATH",
+    help="read username and password from a credential file"
+)
 GROUP.add_argument(
     "--links",
     type=show_value_error(Links.from_string),
@@ -88,11 +95,19 @@ def load(
 
     parser["auth:ilias"] = {}
     auth_section = parser["auth:ilias"]
+    if args.credential_file is not None:
+        if args.username is not None:
+            raise ParserLoadError("--credential-file and --username can't be used together")
+        if args.keyring:
+            raise ParserLoadError("--credential-file and --keyring can't be used together")
+        auth_section["type"] = "credential-file"
+        auth_section["path"] = str(args.credential_file)
+    elif args.keyring:
+        auth_section["type"] = "keyring"
+    else:
         auth_section["type"] = "simple"
     if args.username is not None:
         auth_section["username"] = args.username
-    if args.keyring:
-        auth_section["type"] = "keyring"
 
 
 SUBPARSER.set_defaults(command=load)

PFERD/cli/parser.py

@@ -8,6 +8,10 @@ from ..output_dir import OnConflict, Redownload
 from ..version import NAME, VERSION
 
 
+class ParserLoadError(Exception):
+    pass
+
+
 # TODO Replace with argparse version when updating to 3.9?
 class BooleanOptionalAction(argparse.Action):
     def __init__(