Class: Webstract::Favicon

Inherits:
Object
  • Object
show all
Defined in:
lib/webstract/favicon.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Favicon

Returns a new instance of Favicon.

Raises:

  • (ArgumentError) 


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# File 'lib/webstract/favicon.rb', line 10

def initialize(options = {})
  raise(ArgumentError.new("requires url")) unless options.key?(:url)
  @url = options[:url]
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/webstract/favicon.rb', line 8

def data
  @data
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/webstract/favicon.rb', line 8

def url
  @url
end

Class Method Details

.get(url) ⇒ Object 



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# File 'lib/webstract/favicon.rb', line 27

def self.get(url)

  uri = Addressable::URI.heuristic_parse(url)
  uri = Addressable::URI.encode(uri) # needed for chars with accents in url

  doc = Nokogiri::HTML(open(uri, allow_redirections: :all))

  path = doc.xpath("//link[@rel='shortcut icon' or @rel='icon']/@href").first
  path = path ? path.to_s : '/favicon.ico'

  fav_uri = Addressable::URI.join(uri, path.to_s)

  begin

    stream = open(fav_uri, allow_redirections: :all)

    unless stream.content_type[/^image/]
      raise(Errors::InvalidFavicon, "wrong content_type (#{stream.content_type})")
    end

    data = stream.read

    if data.size == 0
      raise(Errors::InvalidFavicon, "zero data")
    end

    fav = Favicon.new(url: fav_uri.to_s)
    fav.data = data
    return fav

  rescue OpenURI::HTTPError => e
    raise Errors::MissingFavicon if e.to_s[/404/]
    raise # nevermind, reraise the previous exception
  end

end

Instance Method Details

#fetch ⇒ Object 



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# File 'lib/webstract/favicon.rb', line 15

def fetch
  @data = self.class.get(url).data
end

#fetch_and_save(path) ⇒ Object 



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# File 'lib/webstract/favicon.rb', line 19

def fetch_and_save(path)
  data = fetch
  File.open(path, 'w') do |f|
    f.write(data)
    f.close
  end
end