From 749b98175963ae4466250d83af556aa2f248e67e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9gis=20Hanol?= <regis@hanol.fr>
Date: Mon, 25 Jul 2016 23:01:28 +0200
Subject: [PATCH] FEATURE: new 'convert_pasted_images_to_hq_jpg' site setting

---
 app/controllers/uploads_controller.rb | 9 +++++++++
 config/locales/server.en.yml          | 2 ++
 config/site_settings.yml              | 1 +
 3 files changed, 12 insertions(+)

diff --git a/app/controllers/uploads_controller.rb b/app/controllers/uploads_controller.rb
index 7eeca37d888..5a718bd09d9 100644
--- a/app/controllers/uploads_controller.rb
+++ b/app/controllers/uploads_controller.rb
@@ -70,6 +70,15 @@ class UploadsController < ApplicationController
 
       return { errors: I18n.t("upload.file_missing") } if tempfile.nil?
 
+      # convert pasted images to HQ jpegs
+      if filename == "blob.png" && SiteSetting.convert_pasted_images_to_hq_jpg
+        filename = "blob.jpg"
+        jpeg_path = "#{File.dirname(tempfile.path)}/#{filename}"
+        content_type = "image/jpeg"
+        `convert #{tempfile.path} -quality 95 #{jpeg_path}`
+        tempfile = File.open(jpeg_path)
+      end
+
       # allow users to upload large images that will be automatically reduced to allowed size
       max_image_size_kb = SiteSetting.max_image_size_kb.kilobytes
       if max_image_size_kb > 0 && FileHelper.is_image?(filename)
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 4378f5f6dde..6bd5dd295a5 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -1069,6 +1069,8 @@ en:
 
     allow_all_attachments_for_group_messages: "Allow all email attachments for group messages."
 
+    convert_pasted_images_to_hq_jpg: "Convert pasted images to high-quality JPG files."
+
     enable_flash_video_onebox: "Enable embedding of swf and flv (Adobe Flash) links in oneboxes. WARNING: may introduce security risks."
 
     default_invitee_trust_level: "Default trust level (0-4) for invited users."
diff --git a/config/site_settings.yml b/config/site_settings.yml
index 6f41f3c4256..35bf337a935 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -717,6 +717,7 @@ files:
     shadowed_by_global: true
   default_opengraph_image_url: ''
   allow_all_attachments_for_group_messages: false
+  convert_pasted_images_to_hq_jpg: true
 
 trust:
   default_trust_level: