[artstation] fix & update 'challenge' extractor

gallery_dl/extractor/artstation.py

@@ -319,9 +319,9 @@ class ArtstationChallengeExtractor(ArtstationExtractor):
                      "{challenge[id]} - {challenge[title]}")
     archive_fmt = "c_{challenge[id]}_{asset_id}"
     pattern = (r"(?:https?://)?(?:www\.)?artstation\.com"
-               r"/contests/[^/?#]+/challenges/(\d+)"
+               r"/c(?:hallenges|ontests)/[^/?#]+/c(?:ategori|halleng)es/(\d+)"
                r"/?(?:\?sorting=([a-z]+))?")
-    example = "https://www.artstation.com/contests/NAME/challenges/12345"
+    example = "https://www.artstation.com/challenges/NAME/categories/12345"
 
     def __init__(self, match):
         ArtstationExtractor.__init__(self, match)
@@ -329,24 +329,28 @@ class ArtstationChallengeExtractor(ArtstationExtractor):
         self.sorting = match[2] or "popular"
 
     def items(self):
-        base = f"{self.root}/contests/_/challenges/{self.challenge_id}"
-        challenge_url = base + ".json"
-        submission_url = base + "/submissions.json"
-        update_url = self.root + "/contests/submission_updates.json"
+        base = self.root + "/api/v2/competition/"
+        challenge_url = f"{base}challenges/{self.challenge_id}.json"
+        submission_url = base + "submissions.json"
 
         challenge = self.request_json(challenge_url)
         yield Message.Directory, "", {"challenge": challenge}
 
-        params = {"sorting": self.sorting}
+        params = {
+            "page"        : 1,
+            "per_page"    : 50,
+            "challenge_id": self.challenge_id,
+            "sort_by"     : self.sorting,
+        }
+
         for submission in self._pagination(submission_url, params):
-
-            params = {"submission_id": submission["id"]}
+            update_url = (f"{base}submissions/{submission['id']}"
+                          f"/submission_updates.json")
+            params = {"page": 1, "per_page": 50}
             for update in self._pagination(update_url, params=params):
-
-                del update["replies"]
                 update["challenge"] = challenge
-                for url in text.extract_iter(
-                        update["body_presentation_html"], ' href="', '"'):
+                for url in util.unique_sequence(text.extract_iter(
+                        update["body"], ' href="', '"')):
                     update["asset_id"] = self._id_from_url(url)
                     text.nameext_from_url(url, update)
                     yield Message.Url, self._no_cache(url), update

test/results/artstation.py

@@ -108,10 +108,28 @@ __tests__ = (
 },
 
 {
-    "#url"     : "https://www.artstation.com/contests/beyond-human/challenges/23?sorting=winners",
+    "#url"     : "https://www.artstation.com/challenges/beyond-human/categories/23/submissions",
+    "#class"   : artstation.ArtstationChallengeExtractor,
+},
+
+{
+    "#url"     : "https://www.artstation.com/contests/beyond-human/challenges/23?sorting=popular",
     "#class"   : artstation.ArtstationChallengeExtractor,
     "#range"   : "1-30",
     "#count"   : 30,
+
+    "challenge": {
+        "id"        : 23,
+        "headline"  : "Imagining Where Future Humans Live",
+        "created_at": "2017-06-26T14:45:43+00:00",
+        "contest"   : {
+            "archived" : True,
+            "published": True,
+            "slug"     : "beyond-human",
+            "title"    : "Beyond Human",
+            "submissions_count": 4258,
+        },
+    },
 },
 
 {