ContentTypeDetector, Bump Version 5.1.4

CHANGELOG.md

@@ -3,9 +3,13 @@
 
 ## NEXT
 
+## Ckeditor 5.1.4 (2-23-2022)
+
+  * Re-add ContentTypeDetector
+
 ## Ckeditor 5.1.3 (2-23-2022)
 
-  * Add extract_dimensions and extract_content_type as AssetResponse InstanceMethods
+  * Re-add extract_dimensions and extract_content_type as AssetResponse InstanceMethods
 
 ## Ckeditor 5.1.2 (2-23-2022)
 

lib/ckeditor/backend/carrierwave.rb

@@ -13,6 +13,7 @@ def self.included(base)
       module ClassMethods
         def self.extended(base)
           base.class_eval do
+            process :extract_content_type
             process :extract_size
           end
         end

lib/ckeditor/utils.rb

@@ -5,6 +5,7 @@
 module Ckeditor
   module Utils
     autoload :JavascriptCode, 'ckeditor/utils/javascript_code'
+    autoload :ContentTypeDetector, 'ckeditor/utils/content_type_detector'
 
     class << self
       def escape_single_quotes(str)

lib/ckeditor/utils/content_type_detector.rb

@@ -0,0 +1,38 @@
+# encoding: utf-8
+require 'cocaine'
+
+module Ckeditor
+  module Utils
+    class ContentTypeDetector
+      EMPTY_CONTENT_TYPE = 'inode/x-empty'.freeze
+      DEFAULT_CONTENT_TYPE = 'application/octet-stream'.freeze
+
+      def initialize(file_path)
+        @file_path = file_path
+      end
+
+      # content type detection strategy:
+      #
+      # 1. empty file: returns 'inode/x-empty'
+      # 2. nonempty file: if the file is not empty then returns the content type using file command
+      # 3. invalid file: file command raises error and returns 'application/octet-stream'
+
+      def detect
+        empty_file? ? EMPTY_CONTENT_TYPE : content_type_from_file_command
+      end
+
+      private
+
+      def empty_file?
+        return true if @file_path.blank?
+        File.exist?(@file_path) && File.size(@file_path).zero?
+      end
+
+      def content_type_from_file_command
+        Cocaine::CommandLine.new('file', '-b --mime-type :file').run(file: @file_path).strip
+      rescue Cocaine::CommandLineError
+        DEFAULT_CONTENT_TYPE
+      end
+    end
+  end
+end

lib/ckeditor/version.rb

@@ -2,7 +2,7 @@
 
 module Ckeditor
   module Version
-    GEM = '5.1.3'
+    GEM = '5.1.4'
     EDITOR = '4.17.0'
   end
 end