FEATURE: add :before_post_process_cooked hook

Also reduce amount of image downloading

lib/cooked_post_processor.rb

@@ -29,6 +29,7 @@ class CookedPostProcessor
 
   def post_process(bypass_bump = false)
     DistributedMutex.synchronize("post_process_#{@post.id}") do
+      DiscourseEvent.trigger(:before_post_process_cooked, @doc, @post)
       keep_reverse_index_up_to_date
       post_process_images
       post_process_oneboxes
@@ -193,7 +194,14 @@ class CookedPostProcessor
     return unless src.present?
 
     width, height = img["width"].to_i, img["height"].to_i
-    original_width, original_height = get_size(src)
+    upload = Upload.get_from_url(src)
+
+    original_width, original_height =
+      if upload
+        [upload.width, upload.height]
+      else
+        get_size(src)
+      end
 
     # can't reach the image...
     if original_width.nil? ||
@@ -217,7 +225,7 @@ class CookedPostProcessor
       img["height"] = height
     end
 
-    if upload = Upload.get_from_url(src)
+    if upload
       upload.create_thumbnail!(width, height, crop)
     end
 

spec/components/cooked_post_processor_spec.rb

@@ -150,7 +150,7 @@ describe CookedPostProcessor do
 
     context "with large images" do
 
-      let(:upload) { Fabricate(:upload) }
+      let(:upload) { Fabricate(:upload, width: 1750, height: 2000) }
       let(:post) { Fabricate(:post_with_large_image) }
       let(:cpp) { CookedPostProcessor.new(post) }
 
@@ -179,7 +179,7 @@ describe CookedPostProcessor do
 
     context "with large images when using subfolders" do
 
-      let(:upload) { Fabricate(:upload) }
+      let(:upload) { Fabricate(:upload, width: 1750, height: 2000) }
       let(:post) { Fabricate(:post_with_large_image_on_subfolder) }
       let(:cpp) { CookedPostProcessor.new(post) }
       let(:base_url) { "http://test.localhost/subfolder" }
@@ -220,7 +220,7 @@ describe CookedPostProcessor do
 
     context "with title" do
 
-      let(:upload) { Fabricate(:upload) }
+      let(:upload) { Fabricate(:upload, width: 1750, height: 2000) }
       let(:post) { Fabricate(:post_with_large_image_and_title) }
       let(:cpp) { CookedPostProcessor.new(post) }