implement 'text.root_from_url()'

use domain from input URL for kemono

gallery_dl/extractor/common.py

@@ -621,8 +621,7 @@ class BaseExtractor(Extractor):
                     if index:
                         self.category, self.root = self.instances[index-1]
                         if not self.root:
-                            url = text.ensure_http_scheme(match.group(0))
-                            self.root = url[:url.index("/", 8)]
+                            self.root = text.root_from_url(match.group(0))
                     else:
                         self.root = group
                         self.category = group.partition("://")[2]

gallery_dl/extractor/kemonoparty.py

@@ -30,8 +30,8 @@ class KemonopartyExtractor(Extractor):
     def __init__(self, match):
         if match.group(1) == "coomer":
             self.category = "coomerparty"
-            self.root = "https://coomer.party"
             self.cookiedomain = ".coomer.party"
+        self.root = text.root_from_url(match.group(0))
         Extractor.__init__(self, match)
 
     def items(self):