Implemented filetype validations and tests for image attachments

This commit implements validations for content type. Specifically,this
new validation ensures image file types .png/.jpeg/.jpg/.gif are the only
accepted file formats at this time, but can be edited by altering the
accepted_image_types method to allow other formats should the developer
desire to implement that functionality. This method was tested by
building the objects and testing validity with both a valid image file
and an invalid .txt file.

Commit History:
Created validation tests for images

Implemented validation of filetypes

Renamed validation

Patched file not found error for url

Core test update to be compatible with new validation

Core test update to be compatible with new validation

Updated test to have file names

Implemented compatible syntax for AS and Paperclip

Separate NoFileError to another branch

Refactored validation tests

Returned mistakenly deleted white space

Removed describe block

core/app/models/spree/image/active_storage_attachment.rb

@@ -7,6 +7,10 @@ module Spree::Image::ActiveStorageAttachment
   delegate :width, :height, to: :attachment, prefix: true
 
   included do
+    validates :attachment, presence: true
+    validate :attachment_is_an_image
+    validate :supported_content_type
+
     has_attachment :attachment,
                    styles: {
                    mini: '48x48>',
@@ -15,7 +19,15 @@ module Spree::Image::ActiveStorageAttachment
                    large: '1200x1200>'
                  },
                  default_style: :product
-    validates :attachment, presence: true
-    validate :attachment_is_an_image
+
+    def supported_content_type
+      unless attachment.content_type.in?(accepted_image_types)
+        errors.add(:attachment, :content_type_not_supported)
+      end
+    end
+
+    def accepted_image_types
+      %w(image/jpeg image/jpg image/png image/gif)
+    end
   end
 end

core/lib/spree/testing_support/fixtures/file.txt

@@ -0,0 +1 @@
+This is a text file

core/spec/lib/search/base_spec.rb

@@ -22,11 +22,12 @@
 
   context "when include_images is included in the initialization params" do
     let(:params) { { include_images: true, keyword: @product1.name, taxon: @taxon.id } }
+    let(:image_file) { File.open(File.join('lib', 'spree', 'testing_support', 'fixtures', 'blank.jpg')) }
     subject { described_class.new(params).retrieve_products }
 
     before do
-      @product1.master.images.create(attachment_file_name: "Test", position: 2)
-      @product1.master.images.create(attachment_file_name: "Test1", position: 1)
+      @product1.master.images.create(attachment_file_name: 'test', attachment: image_file, position: 2)
+      @product1.master.images.create(attachment_file_name: 'test1', attachment: image_file, position: 1)
       @product1.reload
     end
 

core/spec/models/spree/image_spec.rb

@@ -9,6 +9,18 @@
     let(:default_style) { :product }
   end
 
+  it 'is valid when attachment has allowed content type' do
+    image = build(:image,
+                  attachment: File.open(File.join('lib', 'spree', 'testing_support', 'fixtures', 'blank.jpg')))
+    expect(image).to be_valid
+  end
+
+  it 'is not valid when attachment has restricted content type' do
+    image = build(:image,
+                  attachment: File.open(File.join('lib', 'spree', 'testing_support', 'fixtures', 'file.txt')))
+    expect(image).to_not be_valid
+  end
+
   describe 'attachment details' do
     let(:image_file) { File.open(File.join('lib', 'spree', 'testing_support', 'fixtures', 'blank.jpg')) }
     subject { create(:image, attachment: image_file) }