Add image_file method to Placeholdit module

lib/faker/placeholdit.rb

@@ -1,3 +1,6 @@
+require "tempfile"
+require "net/http"
+
 module Faker
   class Placeholdit < Base
     class << self
@@ -9,8 +12,8 @@ def image(size = '300x300', format = 'png', background_color = nil, text_color =
 
         raise ArgumentError, 'Size should be specified in format 300x300' unless size =~ /^[0-9]+x[0-9]+$/
         raise ArgumentError, "Supported formats are #{SUPPORTED_FORMATS.join(', ')}" unless SUPPORTED_FORMATS.include?(format)
-        raise ArgumentError, "background_color must be a hex value without '#'" unless background_color.nil? || background_color.match(/((?:^\h{3}$)|(?:^\h{6}$)){1}(?!.*\H)/)
-        raise ArgumentError, "text_color must be a hex value without '#'" unless text_color.nil? || text_color.match(/((?:^\h{3}$)|(?:^\h{6}$)){1}(?!.*\H)/)
+        raise ArgumentError, "background_color must be a hex value without '#'" unless background_color.nil? || background_color =~ /((?:^\h{3}$)|(?:^\h{6}$)){1}(?!.*\H)/
+        raise ArgumentError, "text_color must be a hex value without '#'" unless text_color.nil? || text_color =~ /((?:^\h{3}$)|(?:^\h{6}$)){1}(?!.*\H)/
 
         image_url = "https://placehold.it/#{size}.#{format}"
         image_url += "/#{background_color}" if background_color
@@ -19,11 +22,24 @@ def image(size = '300x300', format = 'png', background_color = nil, text_color =
         image_url
       end
 
+      def image_file(size = '300x300', format = 'png', background_color = nil, text_color = nil, text = nil)
+        download_file image(size, format, background_color, text_color, text)
+      end
+
       private
 
       def generate_color
         format('%06x', (rand * 0xffffff))
       end
+
+      def download_file(url)
+        file = Tempfile.new("faker_placeholdit")
+        file.binmode
+        file << Net::HTTP.get(URI(url))
+        file.close
+
+        ::File.new(file.path)
+      end
     end
   end
 end

test/test_placeholdit.rb

@@ -96,4 +96,8 @@ def test_text_not_present
   def test_text_present
     assert @tester.image('300x300', 'jpg', 'fff', '000', 'hello').match(%r{https:\/\/placehold\.it\/(.+)\?text=hello})
   end
+
+  def test_image_file
+    assert_instance_of File, @tester.image_file('300x300', 'jpg', 'fff', '000', 'hello')
+  end
 end