Class: Paperclip::Validators::AttachmentBackgroundValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/paperclip/validators/attachment_background_validator.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ AttachmentBackgroundValidator

Returns a new instance of AttachmentBackgroundValidator.



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# File 'lib/paperclip/validators/attachment_background_validator.rb', line 4

def initialize(options)
  super
end

Class Method Details

.helper_method_name ⇒ Object 



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# File 'lib/paperclip/validators/attachment_background_validator.rb', line 8

def self.helper_method_name
  :validates_attachment_background
end

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/paperclip/validators/attachment_background_validator.rb', line 12

def validate_each(record, attribute, value)
  if record.send(attr).try(:queued_for_write).present?
    _video = FFMPEG::Movie.new(record.send(attr).queued_for_write[:original].path)
    if _video.valid?
      frame_png = Tempfile.new(["screenshot_#{record.id}_",'.png'])
      frame_txt = Tempfile.new(["screenshot_#{record.id}_",'.txt'])
      begin
        _video.screenshot(frame_png.path)
        `convert #{frame_png.path} -resize 20% #{frame_txt.path}`
        lines = `head -n 10 #{frame_txt.path}`.split("\n")
        lines += `tail -n 10 #{frame_txt.path}`.split("\n")
        lines.shift
        if !lines.all? {|l| l.end_with? '(65535,65535,65535)  #FFFFFF  white'}
          record.errors.add attr, 'Background is not white (#FFFFFF)'
        end
      ensure
        frame_png.close
        frame_png.unlink
        frame_txt.close
        frame_txt.unlink
      end
    end
  end
end