Add local auth provider (#14365)

* Add local auth provider

* Lint

* Docstring

homeassistant/scripts/auth.py

@@ -0,0 +1,78 @@
+"""Script to manage users for the Home Assistant auth provider."""
+import argparse
+import os
+
+from homeassistant.config import get_default_config_dir
+from homeassistant.auth_providers import homeassistant as hass_auth
+
+
+def run(args):
+    """Handle Home Assistant auth provider script."""
+    parser = argparse.ArgumentParser(
+        description=("Manage Home Assistant users"))
+    parser.add_argument(
+        '--script', choices=['auth'])
+    parser.add_argument(
+        '-c', '--config',
+        default=get_default_config_dir(),
+        help="Directory that contains the Home Assistant configuration")
+
+    subparsers = parser.add_subparsers()
+    parser_list = subparsers.add_parser('list')
+    parser_list.set_defaults(func=list_users)
+
+    parser_add = subparsers.add_parser('add')
+    parser_add.add_argument('username', type=str)
+    parser_add.add_argument('password', type=str)
+    parser_add.set_defaults(func=add_user)
+
+    parser_validate_login = subparsers.add_parser('validate')
+    parser_validate_login.add_argument('username', type=str)
+    parser_validate_login.add_argument('password', type=str)
+    parser_validate_login.set_defaults(func=validate_login)
+
+    parser_change_pw = subparsers.add_parser('change_password')
+    parser_change_pw.add_argument('username', type=str)
+    parser_change_pw.add_argument('new_password', type=str)
+    parser_change_pw.set_defaults(func=change_password)
+
+    args = parser.parse_args(args)
+    path = os.path.join(os.getcwd(), args.config, hass_auth.PATH_DATA)
+    args.func(hass_auth.load_data(path), args)
+
+
+def list_users(data, args):
+    """List the users."""
+    count = 0
+    for user in data.users:
+        count += 1
+        print(user['username'])
+
+    print()
+    print("Total users:", count)
+
+
+def add_user(data, args):
+    """Create a user."""
+    data.add_user(args.username, args.password)
+    data.save()
+    print("User created")
+
+
+def validate_login(data, args):
+    """Validate a login."""
+    try:
+        data.validate_login(args.username, args.password)
+        print("Auth valid")
+    except hass_auth.InvalidAuth:
+        print("Auth invalid")
+
+
+def change_password(data, args):
+    """Change password."""
+    try:
+        data.change_password(args.username, args.new_password)
+        data.save()
+        print("Password changed")
+    except hass_auth.InvalidUser:
+        print("User not found")