[exhentai] improve image limits check

- check if current image is the '509 Bandwidth Exceeded' notification
  (https://ehgt.org/g/509.gif or https://exhentai.org/img/509.gif)
- remove 'limits' option

docs/configuration.rst

@@ -922,20 +922,6 @@ Description
     * ``"exhentai.org"``: Use ``exhentai.org`` for all URLs
 
 
-extractor.exhentai.limits
--------------------------
-Type
-    ``bool`` or ``integer``
-Default
-    ``true``
-Description
-    Check image download limits
-    and stop extraction when they are exceeded.
-
-    If this value is an ``integer``, it gets used as the limit maximum
-    instead of the value listed on ``https://e-hentai.org/home.php``
-
-
 extractor.exhentai.metadata
 ---------------------------
 Type

docs/gallery-dl.conf

@@ -79,7 +79,6 @@
             "username": null,
             "password": null,
             "domain": "auto",
-            "limits": true,
             "metadata": false,
             "original": true,
             "sleep-request": 5.0

gallery_dl/extractor/exhentai.py

@@ -43,16 +43,8 @@ class ExhentaiExtractor(Extractor):
         self.cookiedomain = "." + domain
 
         Extractor.__init__(self, match)
-        self.limits = self.config("limits", True)
         self.original = self.config("original", True)
 
-        if type(self.limits) is int:
-            self._limit_max = self.limits
-            self.limits = True
-        else:
-            self._limit_max = 0
-
-        self._remaining = 0
         self.session.headers["Referer"] = self.root + "/"
         if version != "ex":
             self.session.cookies.set("nw", "1", domain=self.cookiedomain)
@@ -77,7 +69,6 @@ class ExhentaiExtractor(Extractor):
             self.log.info("no username given; using e-hentai.org")
             self.root = "https://e-hentai.org"
             self.original = False
-            self.limits = False
             self.session.cookies["nw"] = "1"
 
     @cache(maxage=90*24*3600, keyarg=1)
@@ -206,8 +197,6 @@ class ExhentaiGalleryExtractor(ExhentaiExtractor):
             (self.image_from_page(ipage),), self.images_from_api())
         for url, image in images:
             data.update(image)
-            if self.limits:
-                self._check_limits(data)
             if "/fullimg.php" in url:
                 data["extension"] = ""
             yield Message.Url, url, data
@@ -299,6 +288,8 @@ class ExhentaiGalleryExtractor(ExhentaiExtractor):
         data["image_token"] = self.key["start"] = extr('var startkey="', '";')
         self.key["show"] = extr('var showkey="', '";')
 
+        if iurl.endswith("g/509.gif"):
+            self._report_limits(data)
         return url, text.nameext_from_url(iurl, data)
 
     def images_from_api(self):
@@ -333,10 +324,20 @@ class ExhentaiGalleryExtractor(ExhentaiExtractor):
 
             data["num"] = request["page"]
             data["image_token"] = imgkey
+
+            if imgurl.endswith("g/509.gif"):
+                self._report_limits(data)
             yield url, text.nameext_from_url(imgurl, data)
 
             request["imgkey"] = nextkey
 
+    def _report_limits(self, data):
+        ExhentaiExtractor.LIMIT = True
+        raise exception.StopExtraction(
+            "Image limit reached! "
+            "Continue with '%s/s/%s/%s-%s' as URL after resetting it.",
+            self.root, data["image_token"], self.gallery_id, data["num"])
+
     def _gallery_page(self):
         url = "{}/g/{}/{}/".format(
             self.root, self.gallery_id, self.gallery_token)
@@ -360,35 +361,6 @@ class ExhentaiGalleryExtractor(ExhentaiExtractor):
             raise exception.NotFoundError("image page")
         return page
 
-    def _check_limits(self, data):
-        if not self._remaining or data["num"] % 25 == 0:
-            self._update_limits()
-        self._remaining -= data["cost"]
-
-        if self._remaining <= 0:
-            ExhentaiExtractor.LIMIT = True
-            url = "{}/s/{}/{}-{}".format(
-                self.root, data["image_token"], self.gallery_id, data["num"])
-            raise exception.StopExtraction(
-                "Image limit reached! Continue with '%s' "
-                "as URL after resetting it.", url)
-
-    def _update_limits(self):
-        url = "https://e-hentai.org/home.php"
-        cookies = {
-            cookie.name: cookie.value
-            for cookie in self.session.cookies
-            if cookie.domain == self.cookiedomain and cookie.name != "igneous"
-        }
-
-        page = self.request(url, cookies=cookies).text
-        current, pos = text.extract(page, "<strong>", "</strong>")
-        maximum, pos = text.extract(page, "<strong>", "</strong>", pos)
-        if self._limit_max:
-            maximum = self._limit_max
-        self.log.debug("Image Limits: %s/%s", current, maximum)
-        self._remaining = text.parse_int(maximum) - text.parse_int(current)
-
     @staticmethod
     def _parse_image_info(url):
         for part in url.split("/")[4:]: