Restructure crawling and auth related modules

PFERD/auth/__init__.py

@@ -0,0 +1,20 @@
+from configparser import SectionProxy
+from typing import Callable, Dict
+
+from ..config import Config
+from .authenticator import Authenticator, AuthSection
+from .simple import SimpleAuthenticator, SimpleAuthSection
+from .tfa import TfaAuthenticator
+
+AuthConstructor = Callable[[
+    str,                # Name (without the "auth:" prefix)
+    SectionProxy,       # Authenticator's section of global config
+    Config,             # Global config
+], Authenticator]
+
+AUTHENTICATORS: Dict[str, AuthConstructor] = {
+    "simple": lambda n, s, c:
+        SimpleAuthenticator(n, SimpleAuthSection(s), c),
+    "tfa": lambda n, s, c:
+        TfaAuthenticator(n, AuthSection(s), c),
+}