automatically resizes images

Gemfile

@@ -26,6 +26,9 @@ gem 'hiredis'
 # note: for image_optim to correctly work you need
 # sudo apt-get install -y advancecomp gifsicle jpegoptim libjpeg-progs optipng pngcrush
 gem 'image_optim'
+# note: for image_sorcery to correctly work you need
+# sudo apt-get install -y imagemagick
+gem 'image_sorcery'
 gem 'jquery-rails'
 gem 'minitest'
 gem 'multi_json'

Gemfile.lock

@@ -219,6 +219,7 @@ GEM
       in_threads (~> 1.1.1)
       progress (~> 2.4.0)
     image_size (1.1.1)
+    image_sorcery (1.1.0)
     in_threads (1.1.1)
     ipaddress (0.8.0)
     jasminerice (0.0.10)

lib/cooked_post_processor.rb

@@ -2,9 +2,9 @@
 # example, inserting the onebox content, or image sizes.
 
 require_dependency 'oneboxer'
+require_dependency 'image_optimizer'
 
 class CookedPostProcessor
-  require 'open-uri'
 
   def initialize(post, opts={})
     @dirty = false
@@ -34,21 +34,14 @@ class CookedPostProcessor
     images = @doc.search("img")
     return unless images.present?
 
-    # Extract the first image from the first post and use it as the 'topic image'
-    if @post.post_number == 1
-      img = images.first
-      @post.topic.update_column :image_url, img['src'] if img['src'].present?
-    end
-
     images.each do |img|
       src = img['src']
       src = Discourse.base_url_no_prefix + src if src[0] == "/"
 
-      if src.present? && (img['width'].blank? || img['height'].blank?)
+      if src.present?
 
-        w,h =
+        if img['width'].blank? || img['height'].blank?
-          get_size_from_image_sizes(src, @opts[:image_sizes]) ||
+          w, h = get_size_from_image_sizes(src, @opts[:image_sizes]) || image_dimensions(src)
-          image_dimensions(src)
 
           if w && h
             img['width'] = w.to_s
@@ -57,31 +50,39 @@ class CookedPostProcessor
           end
         end
 
-      if src.present?
         if src != img['src']
           img['src'] = src
           @dirty = true
         end
+
         convert_to_link!(img)
-        img.set_attribute('src', optimize_image(src))
+        img['src'] = optimize_image(img)
-      end
 
       end
     end
 
-  def optimize_image(src)
+    # Extract the first image from the first post and use it as the 'topic image'
-    # uri = get_image_uri(src)
+    if @post.post_number == 1
-    # uri.open(read_timeout: 20) do |f|
+      img = images.first
-    #
+      @post.topic.update_column :image_url, img['src'] if img['src'].present?
-    # end
+    end
 
-    src
+  end
+
+  def optimize_image(img)
+    src = img["src"]
+
+    # supports only local uploads
+    return src if SiteSetting.enable_imgur? || SiteSetting.enable_s3_uploads?
+
+    width, height = img["width"].to_i, img["height"].to_i
+
+    ImageOptimizer.new(src).optimized_image_url(width, height)
   end
 
   def convert_to_link!(img)
     src = img["src"]
-    width = img["width"].to_i
+    width, height = img["width"].to_i, img["height"].to_i
-    height = img["height"].to_i
 
     return unless src.present? && width > SiteSetting.auto_link_images_wider_than
 

lib/image_optimizer.rb

@@ -1,35 +1,22 @@
+#
 # This class is used to download and optimize images.
 #
-# I have not had a chance to implement me, and will not for about 3 weeks.
+
-# If you are looking for a small project this simple API would be a good stint.
+require 'image_sorcery'
-#
+require 'digest/sha1'
-# Implement the following methods. With tests, the tests are a HUGE PITA cause
+require 'open-uri'
-# network, disk and external dependencies are involved.
 
 class ImageOptimizer
-  attr_accessor :url, :root_dir
+  attr_accessor :url
+
   # url is a url of an image ex:
   # 'http://site.com/image.png'
   # '/uploads/site/image.png'
-  #
+  def initialize(url)
-  # root_dir is the path where we
+    @url = url
-  # store optimized images
+    # make sure directories exists
-  def initialize(opts = {})
+    FileUtils.mkdir_p downloads_dir
-    @url = opts[:url]
+    FileUtils.mkdir_p optimized_dir
-    @root_dir = opts[:root_dir]
-  end
-
-  # attempt to refresh the original image, if refreshed
-  #  remove old downsized copies
-  def refresh_local!
-  end
-
-  # clear all local copies of the images
-  def clear_local!
-  end
-
-  # yield a list of relative paths to local images cached
-  def each_local
   end
 
   # return the path of an optimized image,
@@ -42,7 +29,68 @@ class ImageOptimizer
   #  at the basic level it runs through image_optim https://github.com/toy/image_optim
   #  it also has a failsafe that converts jpg to png or the opposite. if jpg size is 1.5*
   #  as efficient as png it flips formats.
-  def optimized_image_path(width=nil, height=nil)
+  def optimized_image_url (width = nil, height = nil)
+    begin
+      unless has_been_uploaded?
+        return @url unless SiteSetting.crawl_images?
+        # download the file if it hasn't been cached yet
+        download! unless File.exists?(cached_path)
+      end
+
+      # resize the image using Image Magick
+      result = ImageSorcery.new(cached_path).convert(optimized_path, resize: "#{width}x#{height}")
+      return optimized_url if result
+      @url
+    rescue
+      @url
+    end
+  end
+
+private
+
+  def public_dir
+    @public_dir ||= "#{Rails.root}/public"
+  end
+
+  def downloads_dir
+    @downloads_dir ||= "#{public_dir}/downloads/#{RailsMultisite::ConnectionManagement.current_db}"
+  end
+
+  def optimized_dir
+    @optimized_dir ||= "#{public_dir}/images/#{RailsMultisite::ConnectionManagement.current_db}"
+  end
+
+  def has_been_uploaded?
+    @url.start_with?(Discourse.base_url_no_prefix)
+  end
+
+  def cached_path
+    @cached_path ||= if has_been_uploaded?
+      "#{public_dir}#{@url[Discourse.base_url_no_prefix.length..-1]}"
+    else
+      "#{downloads_dir}/#{file_name(@url)}"
+    end
+  end
+
+  def optimized_path
+    @optimized_path ||= "#{optimized_dir}/#{file_name(cached_path)}"
+  end
+
+  def file_name (uri)
+    image_info = FastImage.new(uri)
+    name = Digest::SHA1.hexdigest(uri)[0,16]
+    name << ".#{image_info.type}"
+    name
+  end
+
+  def download!
+    File.open(cached_path, "wb") do |f|
+      f.write open(@url, "rb", read_timeout: 20).read
+    end
+  end
+
+  def optimized_url
+    @optimized_url ||= Discourse::base_uri + "/images/#{RailsMultisite::ConnectionManagement.current_db}/#{file_name(cached_path)}"
   end
 
 end

spec/components/cooked_post_processor_spec.rb

@@ -41,6 +41,7 @@ describe CookedPostProcessor do
       before do
         @topic = Fabricate(:topic)
         @post = Fabricate.build(:post_with_image_url, topic: @topic, user: @topic.user)
+        ImageSorcery.any_instance.stubs(:convert).returns(false)
         @cpp = CookedPostProcessor.new(@post, image_sizes: {'http://www.forumwarz.com/images/header/logo.png' => {'width' => 111, 'height' => 222}})
         @cpp.expects(:get_size).returns([111,222])
       end
@@ -63,6 +64,7 @@ describe CookedPostProcessor do
 
       before do
         FastImage.stubs(:size).returns([123, 456])
+        ImageSorcery.any_instance.stubs(:convert).returns(false)
         CookedPostProcessor.any_instance.expects(:image_dimensions).returns([123, 456])
         creator = PostCreator.new(user, raw: Fabricate.build(:post_with_images).raw, topic_id: topic.id)
         @post = creator.create
@@ -70,7 +72,7 @@ describe CookedPostProcessor do
 
       it "adds a topic image if there's one in the post" do
         @post.topic.reload
-        @post.topic.image_url.should == "/path/to/img.jpg"
+        @post.topic.image_url.should == "http://test.localhost/path/to/img.jpg"
       end
 
       it "adds the height and width to images that don't have them" do

spec/models/post_action_spec.rb

@@ -3,6 +3,10 @@ require_dependency 'post_destroyer'
 
 describe PostAction do
 
+  before do
+    ImageSorcery.any_instance.stubs(:convert).returns(false)
+  end
+
   it { should belong_to :user }
   it { should belong_to :post }
   it { should belong_to :post_action_type }

spec/models/post_alert_observer_spec.rb

@@ -3,6 +3,10 @@ require_dependency 'post_destroyer'
 
 describe PostAlertObserver do
 
+  before do
+    ImageSorcery.any_instance.stubs(:convert).returns(false)
+  end
+
   let!(:evil_trout) { Fabricate(:evil_trout) }
   let(:post) { Fabricate(:post) }
 

spec/models/post_spec.rb

@@ -3,6 +3,10 @@ require_dependency 'post_destroyer'
 
 describe Post do
 
+  before do
+    ImageSorcery.any_instance.stubs(:convert).returns(false)
+  end
+
   it { should belong_to :user }
   it { should belong_to :topic }
   it { should validate_presence_of :raw }