[fanbox] support pixiv redirects (closes #2122)

gallery_dl/extractor/fanbox.py

@@ -280,3 +280,24 @@ class FanboxPostExtractor(FanboxExtractor):
 
     def posts(self):
         return (self._get_post_data_from_id(self.post_id),)
+
+
+class FanboxRedirectExtractor(Extractor):
+    """Extractor for pixiv redirects to fanbox.cc"""
+    category = "fanbox"
+    subcategory = "redirect"
+    pattern = r"(?:https?://)?(?:www\.)?pixiv\.net/fanbox/creator/(\d+)"
+    test = ("https://www.pixiv.net/fanbox/creator/52336352", {
+        "pattern": FanboxCreatorExtractor.pattern,
+    })
+
+    def __init__(self, match):
+        Extractor.__init__(self, match)
+        self.user_id = match.group(1)
+
+    def items(self):
+        url = "https://www.pixiv.net/fanbox/creator/" + self.user_id
+        data = {"_extractor": FanboxCreatorExtractor}
+        response = self.request(
+            url, method="HEAD", allow_redirects=False, notfound="user")
+        yield Message.Queue, response.headers["Location"], data

scripts/supportedsites.py

@@ -146,6 +146,9 @@ SUBCATEGORY_MAP = {
         "stash": "Sta.sh",
         "watch-posts": "",
     },
+    "fanbox": {
+        "redirect": "",
+    },
     "hentaifoundry": {
         "story": "",
     },