[gelbooru] support authentication to enable api access

gallery_dl/extractor/gelbooru.py

@@ -9,6 +9,7 @@
 """Extract image-urls from http://gelbooru.com/"""
 
 from .booru import XMLBooruExtractor
+from .. import config
 
 info = {
     "category": "gelbooru",
@@ -26,6 +27,9 @@ class GelbooruExtractor(XMLBooruExtractor):
         XMLBooruExtractor.__init__(self, match, info)
         self.api_url = "http://gelbooru.com/"
         self.params = {"page":"dapi", "s":"post", "q":"index", "tags":self.tags}
+        self.session.cookies.update(
+            config.get(("extractor", info["category"], "cookies"))
+        )
 
     def update_page(self, reset=False):
         if reset is False: