Let crawlers obtain authenticators

PFERD/crawler.py

@@ -4,10 +4,11 @@ from datetime import datetime
 from pathlib import Path, PurePath
 # TODO In Python 3.9 and above, AsyncContextManager is deprecated
 from typing import (Any, AsyncContextManager, AsyncIterator, Awaitable,
-                    Callable, Optional, TypeVar)
+                    Callable, Dict, Optional, TypeVar)
 
 from rich.markup import escape
 
+from .authenticator import Authenticator
 from .conductor import ProgressBar, TerminalConductor
 from .config import Config, Section
 from .limiter import Limiter
@@ -136,6 +137,15 @@ class CrawlerSection(Section):
     def transform(self) -> str:
         return self.s.get("transform", "")
 
+    def auth(self, authenticators: Dict[str, Authenticator]) -> Authenticator:
+        value = self.s.get("auth")
+        if value is None:
+            self.missing_value("auth")
+        auth = authenticators.get(f"auth:{value}")
+        if auth is None:
+            self.invalid_value("auth", value)
+        return auth
+
 
 class Crawler(ABC):
     def __init__(

PFERD/crawlers/__init__.py

@@ -1,19 +1,21 @@
 from configparser import SectionProxy
 from typing import Callable, Dict
 
+from ..authenticator import Authenticator
 from ..conductor import TerminalConductor
 from ..config import Config
 from ..crawler import Crawler
 from .local import LocalCrawler, LocalCrawlerSection
 
 CrawlerConstructor = Callable[[
-    str,                # Name (without the "crawl:" prefix)
-    SectionProxy,       # Crawler's section of global config
-    Config,             # Global config
-    TerminalConductor,  # Global conductor instance
+    str,                       # Name (without the "crawl:" prefix)
+    SectionProxy,              # Crawler's section of global config
+    Config,                    # Global config
+    TerminalConductor,         # Global conductor instance
+    Dict[str, Authenticator],  # Loaded authenticators by name
 ], Crawler]
 
 CRAWLERS: Dict[str, CrawlerConstructor] = {
-    "local": lambda n, s, c, t:
+    "local": lambda n, s, c, t, a:
         LocalCrawler(n, LocalCrawlerSection(s), c, t),
 }

PFERD/pferd.py

@@ -62,6 +62,7 @@ class Pferd:
                 section,
                 self._config,
                 self._conductor,
+                self._authenticators,
             )
             self._crawlers[name] = crawler