DEV: Remove gifsicle dependency (#10357)

Dependency on gifsicle, allow_animated_avatars and allow_animated_thumbnails
site settings were all removed. Animated GIF images are still allowed, but
the generated optimized images are no longer animated for those (which were
used for avatars and thumbnails).

The added 'animated' is populated by extracting information using FastImage.
This field was used to selectively reoptimize old animations. This process
happens in the background.

.github/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
         if: env.BUILD_TYPE != 'LINT'
         run: |
           sudo apt-get update
-          sudo apt-get -yqq install postgresql-client libpq-dev gifsicle jpegoptim optipng jhead
+          sudo apt-get -yqq install postgresql-client libpq-dev jpegoptim optipng jhead
           wget -qO- https://raw.githubusercontent.com/discourse/discourse_docker/master/image/base/install-pngquant | sudo sh
 
       - name: Update imagemagick

app/assets/javascripts/discourse/tests/helpers/site-settings.js

@@ -63,7 +63,6 @@ const ORIGINAL_SETTINGS = {
   max_image_height: 500,
   allow_profile_backgrounds: true,
   allow_uploaded_avatars: true,
-  allow_animated_avatars: false,
   tl1_requires_read_posts: 30,
   enable_long_polling: true,
   polling_interval: 3000,

app/controllers/user_avatars_controller.rb

@@ -189,7 +189,7 @@ class UserAvatarsController < ApplicationController
     return if !upload
     return upload if upload.extension == "svg"
 
-    upload.get_optimized_image(size, size, allow_animation: SiteSetting.allow_animated_avatars)
+    upload.get_optimized_image(size, size)
     # TODO decide if we want to detach here
   end
 

app/jobs/regular/create_avatar_thumbnails.rb

@@ -14,12 +14,7 @@ module Jobs
       return unless upload = Upload.find_by(id: upload_id)
 
       Discourse.avatar_sizes.each do |size|
-        OptimizedImage.create_for(
-          upload,
-          size,
-          size,
-          allow_animation: SiteSetting.allow_animated_avatars
-        )
+        OptimizedImage.create_for(upload, size, size)
       end
     end
 

app/jobs/scheduled/update_animated_uploads.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Jobs
+  class UpdateAnimatedUploads < ::Jobs::Scheduled
+    every 1.hour
+
+    MAX_PROCESSED_GIF_IMAGES ||= 200
+
+    def execute(args)
+      Upload
+        .where("extension = 'gif' OR (extension IS NULL AND original_filename LIKE '%.gif')")
+        .where(animated: nil)
+        .limit(MAX_PROCESSED_GIF_IMAGES)
+        .each do |upload|
+        uri = Discourse.store.path_for(upload) || upload.url
+        upload.update!(animated: FastImage.animated?(uri))
+        upload.optimized_images.destroy_all if upload.animated
+      end
+
+      nil
+    end
+  end
+end

app/models/optimized_image.rb

@@ -234,20 +234,6 @@ class OptimizedImage < ActiveRecord::Base
     })
   end
 
-  def self.resize_instructions_animated(from, to, dimensions, opts = {})
-    ensure_safe_paths!(from, to)
-    resize_method = opts[:scale_image] ? "scale" : "resize-fit"
-
-    %W{
-      gifsicle
-      --colors=#{opts[:colors] || 256}
-      --#{resize_method} #{dimensions}
-      --optimize=3
-      --output #{to}
-      #{from}
-    }
-  end
-
   def self.crop_instructions(from, to, dimensions, opts = {})
     ensure_safe_paths!(from, to)
 
@@ -270,19 +256,6 @@ class OptimizedImage < ActiveRecord::Base
     }
   end
 
-  def self.crop_instructions_animated(from, to, dimensions, opts = {})
-    ensure_safe_paths!(from, to)
-
-    %W{
-      gifsicle
-      --crop 0,0+#{dimensions}
-      --colors=#{opts[:colors] || 256}
-      --optimize=3
-      --output #{to}
-      #{from}
-    }
-  end
-
   def self.downsize_instructions(from, to, dimensions, opts = {})
     ensure_safe_paths!(from, to)
 
@@ -302,10 +275,6 @@ class OptimizedImage < ActiveRecord::Base
     }
   end
 
-  def self.downsize_instructions_animated(from, to, dimensions, opts = {})
-    resize_instructions_animated(from, to, dimensions, opts)
-  end
-
   def self.resize(from, to, width, height, opts = {})
     optimize("resize", from, to, "#{width}x#{height}", opts)
   end
@@ -322,10 +291,6 @@ class OptimizedImage < ActiveRecord::Base
   def self.optimize(operation, from, to, dimensions, opts = {})
     method_name = "#{operation}_instructions"
 
-    if !!opts[:allow_animation] && (from =~ /\.GIF$/i)
-      method_name += "_animated"
-    end
-
     instructions = self.public_send(method_name.to_sym, from, to, dimensions, opts)
     convert_with(instructions, to, opts)
   end

app/models/upload.rb

@@ -78,7 +78,6 @@ class Upload < ActiveRecord::Base
   def create_thumbnail!(width, height, opts = nil)
     return unless SiteSetting.create_thumbnails?
     opts ||= {}
-    opts[:allow_animation] = SiteSetting.allow_animated_thumbnails
 
     if get_optimized_image(width, height, opts)
       save(validate: false)
@@ -86,7 +85,9 @@ class Upload < ActiveRecord::Base
   end
 
   # this method attempts to correct old incorrect extensions
-  def get_optimized_image(width, height, opts)
+  def get_optimized_image(width, height, opts = nil)
+    opts ||= {}
+
     if (!extension || extension.length == 0)
       fix_image_extension
     end
@@ -461,11 +462,12 @@ end
 #  secure                 :boolean          default(FALSE), not null
 #  access_control_post_id :bigint
 #  original_sha1          :string
-#  verified               :boolean
 #  verification_status    :integer          default(1), not null
+#  animated               :boolean
 #
 # Indexes
 #
+#  idx_uploads_on_verification_status       (verification_status)
 #  index_uploads_on_access_control_post_id  (access_control_post_id)
 #  index_uploads_on_etag                    (etag)
 #  index_uploads_on_extension               (lower((extension)::text))

config/locales/server.en.yml

@@ -2000,8 +2000,6 @@ en:
     logout_redirect: "Location to redirect browser to after logout (eg: https://example.com/logout)"
 
     allow_uploaded_avatars: "Allow users to upload custom profile pictures."
-    allow_animated_avatars: "Allow users to use animated gif profile pictures. WARNING: run the avatars:refresh rake task after changing this setting."
-    allow_animated_thumbnails: "Generates animated thumbnails of animated gifs."
     default_avatars: "URLs to avatars that will be used by default for new users until they change them."
     automatically_download_gravatars: "Download Gravatars for users upon account creation or email change."
     digest_topics: "The maximum number of popular topics to display in the email summary."

config/site_settings.yml

@@ -1308,10 +1308,6 @@ files:
   allow_uploaded_avatars:
     client: true
     default: true
-  allow_animated_avatars:
-    client: true
-    default: false
-  allow_animated_thumbnails: true
   default_avatars:
     default: ""
     type: url_list

db/migrate/20200707183007_add_animated_to_uploads.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddAnimatedToUploads < ActiveRecord::Migration[6.0]
+  def change
+    add_column :uploads, :animated, :boolean
+  end
+end

db/migrate/20200714105026_delete_allow_animated_avatars_site_setting.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class DeleteAllowAnimatedAvatarsSiteSetting < ActiveRecord::Migration[6.0]
+  def up
+    execute "DELETE FROM site_settings WHERE name = 'allow_animated_avatars'"
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration.new
+  end
+end

db/migrate/20200714105027_delete_allow_animated_thumbnails_site_setting.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class DeleteAllowAnimatedThumbnailsSiteSetting < ActiveRecord::Migration[6.0]
+  def up
+    execute "DELETE FROM site_settings WHERE name = 'allow_animated_thumbnails'"
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration.new
+  end
+end

docs/DEVELOPER-ADVANCED.md

@@ -12,7 +12,7 @@ To get your Ubuntu 16.04 or 18.04 LTS install up and running to develop Discours
     whoami > /tmp/username
     sudo add-apt-repository ppa:chris-lea/redis-server
     sudo apt-get -yqq update
-    sudo apt-get -yqq install software-properties-common vim curl expect debconf-utils git-core build-essential zlib1g-dev libssl-dev openssl libcurl4-openssl-dev libreadline6-dev libpcre3 libpcre3-dev imagemagick redis-server advancecomp gifsicle jhead jpegoptim libjpeg-turbo-progs optipng pngcrush pngquant gnupg2
+    sudo apt-get -yqq install software-properties-common vim curl expect debconf-utils git-core build-essential zlib1g-dev libssl-dev openssl libcurl4-openssl-dev libreadline6-dev libpcre3 libpcre3-dev imagemagick redis-server advancecomp jhead jpegoptim libjpeg-turbo-progs optipng pngcrush pngquant gnupg2
 
     # Ruby
     curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -

docs/DEVELOPMENT-OSX-NATIVE.md

@@ -223,7 +223,7 @@ In addition to ImageMagick we also need to install some other image related
 software:
 
 ```sh
-brew install gifsicle jpegoptim optipng jhead
+brew install jpegoptim optipng jhead
 npm install -g svgo
 ```
 

lib/upload_creator.rb

@@ -126,6 +126,7 @@ class UploadCreator
       if is_image
         @upload.thumbnail_width, @upload.thumbnail_height = ImageSizer.resize(*@image_info.size)
         @upload.width, @upload.height = @image_info.size
+        @upload.animated = FastImage.animated?(@file)
       end
 
       add_metadata!
@@ -279,7 +280,6 @@ class UploadCreator
         from,
         to,
         scale,
-        allow_animation: allow_animation,
         scale_image: true,
         raise_on_error: true
       )
@@ -351,17 +351,17 @@ class UploadCreator
     case @opts[:type]
     when "avatar"
       width = height = Discourse.avatar_sizes.max
-      OptimizedImage.resize(@file.path, @file.path, width, height, filename: filename_with_correct_ext, allow_animation: allow_animation)
+      OptimizedImage.resize(@file.path, @file.path, width, height, filename: filename_with_correct_ext)
     when "profile_background"
       max_width = 850 * max_pixel_ratio
       width, height = ImageSizer.resize(@image_info.size[0], @image_info.size[1], max_width: max_width, max_height: max_width)
-      OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
+      OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext)
     when "card_background"
       max_width = 590 * max_pixel_ratio
       width, height = ImageSizer.resize(@image_info.size[0], @image_info.size[1], max_width: max_width, max_height: max_width)
-      OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
+      OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext)
     when "custom_emoji"
-      OptimizedImage.downsize(@file.path, @file.path, "100x100\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
+      OptimizedImage.downsize(@file.path, @file.path, "100x100\>", filename: filename_with_correct_ext)
     end
 
     extract_image_info!
@@ -401,10 +401,6 @@ class UploadCreator
     @image_info.size&.reduce(:*).to_i
   end
 
-  def allow_animation
-    @allow_animation ||= @opts[:type] == "avatar" ? SiteSetting.allow_animated_avatars : SiteSetting.allow_animated_thumbnails
-  end
-
   def svg_allowlist_xpath
     @@svg_allowlist_xpath ||= "//*[#{ALLOWED_SVG_ELEMENTS.map { |e| "name()!='#{e}'" }.join(" and ") }]"
   end

spec/jobs/update_animated_uploads_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Jobs::UpdateAnimatedUploads do
+  let!(:upload) { Fabricate(:upload) }
+  let!(:gif_upload) { Fabricate(:upload, extension: "gif") }
+
+  it "affects only GIF uploads" do
+    url = Discourse.store.path_for(gif_upload) || gif_upload.url
+    FastImage.expects(:animated?).with(url).returns(true).once
+
+    described_class.new.execute({})
+
+    expect(upload.reload.animated).to eq(nil)
+    expect(gif_upload.reload.animated).to eq(true)
+  end
+end