use Extractor._check_cookies() for all cookie checks

gallery_dl/extractor/fanbox.py

@@ -33,7 +33,7 @@ class FanboxExtractor(Extractor):
     def items(self):
 
         if self._warning:
-            if "FANBOXSESSID" not in self.session.cookies:
+            if not self._check_cookies(("FANBOXSESSID",)):
                 self.log.warning("no 'FANBOXSESSID' cookie set")
             FanboxExtractor._warning = False
 

gallery_dl/extractor/fantia.py

@@ -22,7 +22,7 @@ class FantiaExtractor(Extractor):
     def items(self):
 
         if self._warning:
-            if "_session_id" not in self.session.cookies:
+            if not self._check_cookies(("_session_id",)):
                 self.log.warning("no '_session_id' cookie set")
             FantiaExtractor._warning = False
 

gallery_dl/extractor/patreon.py

@@ -29,7 +29,7 @@ class PatreonExtractor(Extractor):
     def items(self):
 
         if self._warning:
-            if "session_id" not in self.session.cookies:
+            if not self._check_cookies(("session_id",)):
                 self.log.warning("no 'session_id' cookie set")
             PatreonExtractor._warning = False
         generators = self._build_file_generators(self.config("files"))