[vk] report errors for private albums (#2556)

gallery_dl/extractor/vk.py

@@ -9,7 +9,7 @@
 """Extractors for https://vk.com/"""
 
 from .common import Extractor, Message
-from .. import text
+from .. import text, exception
 
 BASE_PATTERN = r"(?:https://)?(?:www\.|m\.)?vk\.com"
 
@@ -72,6 +72,10 @@ class VkExtractor(Extractor):
                 url, method="POST", headers=headers, data=data,
             ).json()["payload"][1]
 
+            if len(payload) < 4:
+                self.log.debug(payload)
+                raise exception.AuthorizationError(payload[0])
+
             total = payload[1]
             photos = payload[3]
 
@@ -179,6 +183,10 @@ class VkAlbumExtractor(VkExtractor):
         ("https://vk.com/album-165740836_281339889", {
             "count": 12,
         }),
+        # "Access denied" (#2556)
+        ("https://vk.com/album-53775183_00", {
+            "exception": exception.AuthorizationError,
+        }),
     )
 
     def __init__(self, match):