artstation: include only images in image_urls.

app/logical/sources/strategies/art_station.rb

@@ -54,7 +54,8 @@ module Sources::Strategies
           @json = JSON.parse(resp.body)
           @artist_name = json["user"]["username"]
           @profile_url = json["user"]["permalink"]
-          @image_urls = json["assets"].map do |x| 
+          images = json["assets"].select { |asset| asset["asset_type"] == "image" }
+          @image_urls = images.map do |x|
             y, _, _ = image_url_rewriter.rewrite(x["image_url"], nil)
             y
           end

test/unit/sources/art_station_test.rb

@@ -70,5 +70,17 @@ module Sources
         assert_equal(url, @site.image_url)
       end
     end
+
+    context "The source site for an ArtStation gallery" do
+      setup do
+        @site = Sources::Site.new("https://www.artstation.com/artwork/BDxrA")
+        @site.get
+      end
+
+      should "get only image urls, not video urls" do
+        urls = %w[https://cdnb.artstation.com/p/assets/images/images/006/037/253/original/astri-lohne-sjursen-eva.jpg?1495573664]
+        assert_equal(urls, @site.image_urls)
+      end
+    end
   end
 end