meta_information.rb

# lib/meta_information.rb
require 'nokogiri'
require 'open-uri'

module MetaInformation
  class << self
    def get_meta(input_url)
      return not_valid_url_error unless valid_url?(input_url)

      document = create_document(input_url)
      return nokogiri_error if document == false

      meta_hash = create_meta_array(document)
      success_hash.merge(all_meta: meta_hash)
    end

    private

    def create_meta_array(document)
      array = []
      document.css('meta').each do |node|
        if !node['name'].nil?
          array.push(
            type: 'name',
            name: node['name'],
            content: node['content']
          )
        elsif !node['property'].nil?
          array.push(
            type: 'property',
            property: node['property'],
            content: node['content']
          )
        end
      end
      array
    end

    def valid_url?(uri)
      !!uri.match(/^(https?:\/\/)?([\w\.]+)\.([a-z]{2,6}\.?)(\/[\w\.]*)*\/?$/)
    end

    def create_document(input_url)
      Nokogiri::HTML(open(input_url))
    rescue
      false
    end

    def not_valid_url_error
      {
        success: false,
        error: 'url is not valid'
      }
    end

    def nokogiri_error
      {
        success: false,
        error: 'error with parsing a document'
      }
    end

    def success_hash
      {
        succes: 'true',
        error: ''
      }
    end
  end
end