Función que extrae una imagen desde un articulo importado de un blog, valida que exista y tenga URL correcta, ademas omite imágenes pixel (1x1)

extract_image.rb

def extract_image_from_entry(entry)
  image_list = Magick::ImageList.new
  images = Array.new
  final_image = String.new
    
  content = Nokogiri::HTML(entry.content || entry.summary)
    
  content.xpath("//img").each do |img|
    unless img.attributes['src'].blank?
      image_src = img.attributes['src'].value
      images = image_list.read(image_src) if validate_image_url(image_src) && validate_url_route(image_src) && !image_list.read(image_src).blank?
    end
  end
    
  if !images.blank?
    images.each do |image|
      break if image.columns.to_i == 1 && image.rows.to_i == 1
      final_image = image.base_filename
    end
  end
    
  !final_image.blank? ? final_image : nil
end
  
def validate_image_url(image_url)
  regex = /^(http?|https):\/\/[a-z0-9-]+(\.[a-z0-9-]+)+(\/[\w-]+)*\/[\w-]+\.(gif|jpg|jpeg|png|bmp|GIF|JPEG|JPG|PNG|BMP|Gif|Jpg|Jpeg|Png|Bmp)$/
  image_url =~ regex ? true : false
end
  
def validate_url_route(image_url)
  begin
    url = Net::HTTP.get_response(URI.parse(image_url))
    url.response.msg.eql?("OK") ? true : false
  rescue
    false
  end
end