[deviantart] add 'previews' option (#3782, #6124)

docs/configuration.rst

@@ -1989,7 +1989,7 @@ Description
 
     Setting this option to ``"images"`` only downloads original
     files if they are images and falls back to preview versions for
-    everything else (archives, etc.).
+    everything else (archives, videos, etc.).
 
 
 extractor.deviantart.pagination
@@ -2005,6 +2005,19 @@ Description
     * ``"manual"``: Disregard ``has_more`` and only stop when a batch of results is empty.
 
 
+extractor.deviantart.previews
+-----------------------------
+Type
+    ``bool``
+Default
+    ``false``
+Description
+    For non-image files (archives, videos, etc.),
+    also download the file's preview image.
+
+    Set this option to ``"all"`` to download previews for all files.
+
+
 extractor.deviantart.public
 ---------------------------
 Type

gallery_dl/extractor/deviantart.py

@@ -46,6 +46,7 @@ class DeviantartExtractor(Extractor):
         self.extra = self.config("extra", False)
         self.quality = self.config("quality", "100")
         self.original = self.config("original", True)
+        self.previews = self.config("previews", False)
         self.intermediary = self.config("intermediary", True)
         self.comments_avatars = self.config("comments-avatars", False)
         self.comments = self.comments_avatars or self.config("comments", False)
@@ -77,6 +78,11 @@ class DeviantartExtractor(Extractor):
         else:
             self._update_content = self._update_content_default
 
+        if self.previews == "all":
+            self.previews_images = self.previews = True
+        else:
+            self.previews_images = False
+
         journals = self.config("journals", "html")
         if journals == "html":
             self.commit_journal = self._commit_journal_html
@@ -209,6 +215,18 @@ class DeviantartExtractor(Extractor):
                     comment["_extractor"] = DeviantartAvatarExtractor
                     yield Message.Queue, url, comment
 
+            if self.previews and "preview" in deviation:
+                preview = deviation["preview"]
+                deviation["is_preview"] = True
+                if self.previews_images:
+                    yield self.commit(deviation, preview)
+                else:
+                    mtype = mimetypes.guess_type(
+                        "a." + deviation["extension"], False)[0]
+                    if mtype and not mtype.startswith("image/"):
+                        yield self.commit(deviation, preview)
+                del deviation["is_preview"]
+
             if not self.extra:
                 continue
 

test/results/deviantart.py

@@ -689,6 +689,17 @@ __tests__ = (
     "#exception": exception.NotFoundError,
 },
 
+{
+    "#url"    : "https://www.deviantart.com/justatest235723/art/archive-1103129101",
+    "#comment": "ZIP archive + preview image (#3782)",
+    "#class"  : deviantart.DeviantartDeviationExtractor,
+    "#options": {"previews": True},
+    "#pattern": [
+        r"/f/940f2d05-c5eb-4917-8192-7eb6a2d508c6/di8rvv1-afe65948-16e1-4eca-b08d-9e6aaa9ed344\.zip",
+        r"/i/940f2d05-c5eb-4917-8192-7eb6a2d508c6/di8rvv1-bb9d891f-4374-4203-acd3-aea34b29a6a1\.png",
+    ],
+},
+
 {
     "#url"     : "https://www.deviantart.com/myria-moon/art/Aime-Moi-261986576",
     "#category": ("", "deviantart", "deviation"),