support redirects on 4chan archives

gallery_dl/extractor/2chan.py

@@ -75,12 +75,12 @@ class FutabaThreadExtractor(Extractor):
     @staticmethod
     def _extract_post(post):
         return text.extract_all(post, (
-            ("no"      , 'name="', '"'),
-            ("post"    , '<b>', '</b>'),
-            ("name"    , '<b>', ' </b>'),
-            ("now"     , '</font> ', ' '),
-            (None      , '<blockquote', ''),
-            ("com"     , '>', '</blockquote>'),
+            ("no"  , 'name="', '"'),
+            ("post", '<b>', '</b>'),
+            ("name", '<b>', ' </b>'),
+            ("now" , '</font> ', ' '),
+            (None  , '<blockquote', ''),
+            ("com" , '>', '</blockquote>'),
         ))[0]
 
     @staticmethod

gallery_dl/extractor/chan.py

@@ -10,6 +10,7 @@
 
 from .common import Extractor, Message
 from .. import text
+import itertools
 
 
 class ChanThreadExtractor(Extractor):
@@ -76,13 +77,22 @@ class FoolfuukaThreadExtractor(Extractor):
     def items(self):
         op = True
         yield Message.Version, 1
+        yield Message.Headers, self.session.headers
         for post in self.posts():
             if op:
                 yield Message.Directory, post
                 op = False
             if not post["media"]:
                 continue
-            url = post["media"]["media_link"]
+
+            media = post["media"]
+            url = media["media_link"]
+
+            if not url and "remote_media_link" in media:
+                needle = '<meta http-equiv="Refresh" content="0; url='
+                page = self.request(media["remote_media_link"]).text
+                url = text.extract(page, needle, '"')[0]
+
             post["extension"] = url.rpartition(".")[2]
             yield Message.Url, url, post
 
@@ -90,6 +100,4 @@ class FoolfuukaThreadExtractor(Extractor):
         url = self.root + "/_/api/chan/thread/"
         params = {"board": self.board, "num": self.thread}
         data = self.request(url, params=params).json()[self.thread]
-
-        yield data["op"]
-        yield from data["posts"].values()
+        return itertools.chain((data["op"],), data["posts"].values())