Class: MetaInspector::Parsers::ImagesParser

Inherits:
Base
  • Object
show all
Includes:
Enumerable
Defined in:
lib/meta_inspector/parsers/images.rb

Instance Method Summary collapse

Constructor Details

#initialize(main_parser, options = {}) ⇒ ImagesParser

Returns a new instance of ImagesParser.



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# File 'lib/meta_inspector/parsers/images.rb', line 11

def initialize(main_parser, options = {})
  @download_images = options[:download_images]
  super(main_parser)
end

Instance Method Details

#best ⇒ Object

Returns either the Facebook Open Graph image, twitter suggested image or the largest image in the image collection



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# File 'lib/meta_inspector/parsers/images.rb', line 22

def best
  owner_suggested || largest
end

#favicon ⇒ Object

Return favicon url if exist



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# File 'lib/meta_inspector/parsers/images.rb', line 61

def favicon
  query = '//link[@rel="icon" or contains(@rel, "shortcut")]'
  value = parsed.xpath(query)[0].attributes['href'].value
  @favicon ||= URL.absolutify(value, base_url)
rescue
  nil
end

#images ⇒ Object 



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# File 'lib/meta_inspector/parsers/images.rb', line 16

def images
  self
end

#largest ⇒ Object

Returns the largest image from the image collection, filtered for images that are more square than 10:1 or 1:10



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# File 'lib/meta_inspector/parsers/images.rb', line 36

def largest()
  @larget_image ||= begin
    img_nodes = parsed.search('//img').select{ |img_node| img_node['src'] }
    sizes = img_nodes.map { |img_node| [URL.absolutify(img_node['src'], base_url), img_node['width'], img_node['height']] }
    sizes.uniq! { |url, width, height| url }
    if @download_images
      sizes.map! do |url, width, height|
        width, height = FastImage.size(url) if width.nil? || height.nil?
        [url, width, height]
      end
    else
      sizes.map! do |url, width, height|
        width, height = [0, 0] if width.nil? || height.nil?
        [url, width, height]
      end
    end
    sizes.map! { |url, width, height| [url, width.to_i * height.to_i, width.to_f / height.to_f] }
    sizes.keep_if { |url, area, ratio| ratio > 0.1 && ratio < 10 }
    sizes.sort_by! { |url, area, ratio| -area }
    url, area, ratio = sizes.first
    url
  end
end

#owner_suggested ⇒ Object

Returns the parsed image from Facebook’s open graph property tags Most major websites now define this property and is usually relevant See doc at developers.facebook.com/docs/opengraph/ If none found, tries with Twitter image



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# File 'lib/meta_inspector/parsers/images.rb', line 30

def owner_suggested
  meta['og:image'] || meta['twitter:image']
end