[skeb] fix '429 Too Many Requests' errors (#5766)

Introduce '_handle_429' method to make it easier for Extractors to react
to 429 errors regardless of 'sleep-429' settings.

gallery_dl/extractor/common.py

@@ -43,6 +43,7 @@ class Extractor():
     browser = None
     request_interval = 0.0
     request_interval_min = 0.0
+    request_interval_429 = 60.0
     request_timestamp = 0.0
 
     def __init__(self, match):
@@ -203,7 +204,9 @@ def request(self, url, method="GET", session=None,
                         self.log.warning("Cloudflare CAPTCHA")
                         break
 
-                if code == 429 and self._interval_429:
+                if code == 429 and self._handle_429(response):
+                    continue
+                elif code == 429 and self._interval_429:
                     pass
                 elif code not in retry_codes and code < 500:
                     break
@@ -231,6 +234,8 @@ def request(self, url, method="GET", session=None,
 
         raise exception.HttpError(msg, response)
 
+    _handle_429 = util.false
+
     def wait(self, seconds=None, until=None, adjust=1.0,
              reason="rate limit"):
         now = time.time()
@@ -324,7 +329,7 @@ def _init_options(self):
             self.request_interval_min,
         )
         self._interval_429 = util.build_duration_func(
-            self.config("sleep-429", 60),
+            self.config("sleep-429", self.request_interval_429),
         )
 
         if self._retries < 0:

gallery_dl/extractor/skeb.py

@@ -7,7 +7,7 @@
 """Extractors for https://skeb.jp/"""
 
 from .common import Extractor, Message
-from .. import text, exception
+from .. import text
 import itertools
 
 
@@ -31,14 +31,15 @@ def _init(self):
         if "Authorization" not in self.session.headers:
             self.headers["Authorization"] = "Bearer null"
 
-    def request(self, url, **kwargs):
-        while True:
-            try:
-                return Extractor.request(self, url, **kwargs)
-            except exception.HttpError as exc:
-                if exc.status == 429 and "request_key" in exc.response.cookies:
-                    continue
-                raise
+    def _handle_429(self, response):
+        if "request_key" in response.cookies:
+            return True
+
+        request_key = text.extr(
+            response.text, "request_key=", ";")
+        if request_key:
+            self.cookies.set("request_key", request_key, domain="skeb.jp")
+            return True
 
     def items(self):
         metadata = self.metadata()