uploads: autotag animated_gif/png during upload.

Move animated_gif / animated_png autotagging to take place during
uploading, instead of during tag editing. We can't generally assume the
file will be present on the local filesystem after uploading.

app/logical/apng_inspector.rb

@@ -86,7 +86,7 @@ class APNGInspector
     end
 
     @corrupted = !read_success || actl_corrupted
-    return !@corrupted
+    self
   end
 
   def corrupted?
@@ -109,4 +109,4 @@ class APNGInspector
       return framedata.unpack("N".freeze)[0]
     end
 
-end
+end

app/models/post.rb

@@ -255,24 +255,6 @@ class Post < ApplicationRecord
       file_ext =~ /jpg|jpeg|gif|png/i
     end
 
-    def is_animated_gif?
-      if file_ext =~ /gif/i && File.exists?(file_path)
-        return Magick::Image.ping(file_path).length > 1
-      else
-        return false
-      end
-    end
-    
-    def is_animated_png?
-      if file_ext =~ /png/i && File.exists?(file_path)
-        apng = APNGInspector.new(file_path)
-        apng.inspect!
-        return apng.animated?
-      else
-        return false
-      end
-    end
-
     def is_flash?
       file_ext =~ /swf/i
     end
@@ -765,7 +747,6 @@ class Post < ApplicationRecord
       return tags if !Danbooru.config.enable_dimension_autotagging
 
       tags -= %w(incredibly_absurdres absurdres highres lowres huge_filesize flash webm mp4)
-      tags -= %w(animated_gif animated_png) if new_record?
 
       if has_dimensions?
         if image_width >= 10_000 || image_height >= 10_000
@@ -794,14 +775,6 @@ class Post < ApplicationRecord
         tags << "huge_filesize"
       end
 
-      if is_animated_gif?
-        tags << "animated_gif"
-      end
-      
-      if is_animated_png?
-        tags << "animated_png"
-      end
-
       if is_flash?
         tags << "flash"
       end

app/models/upload.rb

@@ -80,10 +80,14 @@ class Upload < ApplicationRecord
       end
     end
 
-    def tag_audio
-      if is_video? && video.audio_channels.present?
-        self.tag_string = "#{tag_string} video_with_sound"
-      end
+    def automatic_tags
+      return "" unless Danbooru.config.enable_dimension_autotagging
+
+      tags = []
+      tags << "video_with_sound" if is_video_with_audio?
+      tags << "animated_gif" if is_animated_gif?
+      tags << "animated_png" if is_animated_png?
+      tags.join(" ")
     end
 
     def validate_video_duration
@@ -109,9 +113,9 @@ class Upload < ApplicationRecord
         calculate_hash(file_path)
         validate_md5_uniqueness
         validate_md5_confirmation
-        tag_audio
         validate_video_duration
         calculate_file_size(file_path)
+        self.tag_string = "#{tag_string} #{automatic_tags}"
         self.image_width, self.image_height = calculate_dimensions
         generate_resizes(file_path)
         move_file
@@ -219,9 +223,21 @@ class Upload < ApplicationRecord
       %w(webm mp4).include?(file_ext)
     end
 
+    def is_video_with_audio?
+      is_video? && video.audio_channels.present?
+    end
+
     def is_ugoira?
       %w(zip).include?(file_ext)
     end
+
+    def is_animated_gif?
+      file_ext == "gif" && Magick::Image.ping(file_path).length > 1
+    end
+
+    def is_animated_png?
+      file_ext == "png" && APNGInspector.new(file_path).inspect!.animated?
+    end
   end
 
   module ResizerMethods