Module: Onebox::Helpers
- Defined in:
- lib/onebox/helpers.rb
Defined Under Namespace
Classes: DownloadTooLarge
Class Method Summary collapse
- .blank?(value) ⇒ Boolean
- .clean(html) ⇒ Object
- .click_to_scroll_div(width = 690, height = 400) ⇒ Object
- .extract_opengraph(doc) ⇒ Object
- .fetch_content_length(location) ⇒ Object
- .fetch_html_doc(url, headers = nil) ⇒ Object
- .fetch_response(location, limit = nil, domain = nil, headers = nil) ⇒ Object
- .normalize_url_for_output(url) ⇒ Object
- .pretty_filesize(size) ⇒ Object
- .symbolize_keys(hash) ⇒ Object
- .title_attr(meta) ⇒ Object
- .truncate(string, length = 50) ⇒ Object
Class Method Details
.blank?(value) ⇒ Boolean
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# File 'lib/onebox/helpers.rb', line 161 def self.blank?(value) if value.nil? true elsif String === value value.empty? || !(/[[:^space:]]/ === value) else value.respond_to?(:empty?) ? !!value.empty? : !value end end |
.clean(html) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 17 def self.clean(html) html.gsub(/<[^>]+>/, ' ').gsub(/\n/, '') end |
.click_to_scroll_div(width = 690, height = 400) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 157 def self.click_to_scroll_div(width = 690, height = 400) "<div style=\"background:transparent;position:relative;width:#{width}px;height:#{height}px;top:#{height}px;margin-top:-#{height}px;\" onClick=\"style.pointerEvents='none'\"></div>" end |
.extract_opengraph(doc) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 21 def self.extract_opengraph(doc) return {} unless doc og = {} doc.css('meta').each do |m| if (m["property"] && m["property"][/^(?:og|article):(.+)$/i]) || (m["name"] && m["name"][/^(?:og|article):(.+)$/i]) value = (m["content"] || m["value"]).to_s og[$1.tr('-:', '_').to_sym] ||= value unless Onebox::Helpers::blank?(value) end end # Attempt to retrieve the title from the meta tag title_element = doc.at_css('title') if title_element && title_element.text og[:title] ||= title_element.text unless Onebox::Helpers.blank?(title_element.text) end og end |
.fetch_content_length(location) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 118 def self.fetch_content_length(location) uri = URI(location) Net::HTTP.start(uri.host, uri.port, use_ssl: uri.is_a?(URI::HTTPS)) do |http| http.open_timeout = Onebox..connect_timeout http.read_timeout = Onebox..timeout if uri.is_a?(URI::HTTPS) http.use_ssl = true http.verify_mode = OpenSSL::SSL::VERIFY_NONE end http.request_head([uri.path, uri.query].join("?")) do |response| code = response.code.to_i unless code === 200 || Onebox::Helpers.blank?(response.header['content-length']) return nil end return response.header['content-length'] end end end |
.fetch_html_doc(url, headers = nil) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 42 def self.fetch_html_doc(url, headers = nil) response = (fetch_response(url, nil, nil, headers) rescue nil) doc = Nokogiri::HTML(response) ignore_canonical = doc.at('meta[property="og:ignore_canonical"]') unless ignore_canonical && ignore_canonical['content'].to_s == 'true' # prefer canonical link canonical_link = doc.at('//link[@rel="canonical"]/@href') if canonical_link && "#{URI(canonical_link).host}#{URI(canonical_link).path}" != "#{URI(url).host}#{URI(url).path}" response = (fetch_response(canonical_link, nil, nil, headers) rescue nil) doc = Nokogiri::HTML(response) if response end end doc end |
.fetch_response(location, limit = nil, domain = nil, headers = nil) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 59 def self.fetch_response(location, limit = nil, domain = nil, headers = nil) limit ||= 5 limit = Onebox..redirect_limit if limit > Onebox..redirect_limit raise Net::HTTPError.new('HTTP redirect too deep', location) if limit == 0 uri = URI(location) uri = URI("#{domain}#{location}") if !uri.host result = StringIO.new Net::HTTP.start(uri.host, uri.port, use_ssl: uri.is_a?(URI::HTTPS)) do |http| http.open_timeout = Onebox..connect_timeout http.read_timeout = Onebox..timeout if uri.is_a?(URI::HTTPS) http.use_ssl = true http.verify_mode = OpenSSL::SSL::VERIFY_NONE end headers ||= {} if Onebox..user_agent && !headers['User-Agent'] headers['User-Agent'] = Onebox..user_agent end request = Net::HTTP::Get.new(uri.request_uri, headers) start_time = Time.now size_bytes = Onebox..max_download_kb * 1024 http.request(request) do |response| if = response.get_fields('set-cookie') header = { 'Cookie' => .join } end header = nil unless header.is_a? Hash code = response.code.to_i unless code === 200 response.error! unless [301, 302].include?(code) return fetch_response( response['location'], limit - 1, "#{uri.scheme}://#{uri.host}", header ) end response.read_body do |chunk| result.write(chunk) raise DownloadTooLarge.new if result.size > size_bytes raise Timeout::Error.new if (Time.now - start_time) > Onebox..timeout end return result.string end end end |
.normalize_url_for_output(url) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 179 def self.normalize_url_for_output(url) return "" unless url url = url.dup # expect properly encoded url, remove any unsafe chars url.gsub!("'", "'") url.gsub!('"', """) url.gsub!(/[^\w\-`.~:\/?#\[\]@!$&'\(\)*+,;=%]/, "") url end |
.pretty_filesize(size) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 139 def self.pretty_filesize(size) conv = [ 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB' ]; scale = 1024; ndx = 1 if (size < 2 * (scale**ndx)) then return "#{(size)} #{conv[ndx - 1]}" end size = size.to_f [2, 3, 4, 5, 6, 7].each do |i| if (size < 2 * (scale**i)) then return "#{'%.2f' % (size / (scale**(i - 1)))} #{conv[i - 1]}" end end ndx = 7 return "#{'%.2f' % (size / (scale**(ndx - 1)))} #{conv[ndx - 1]}" end |
.symbolize_keys(hash) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 6 def self.symbolize_keys(hash) return {} if hash.nil? hash.inject({}) do |result, (key, value)| new_key = key.is_a?(String) ? key.to_sym : key new_value = value.is_a?(Hash) ? symbolize_keys(value) : value result[new_key] = new_value result end end |
.title_attr(meta) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 175 def self.title_attr() ( && !blank?([:title])) ? "title='#{[:title]}'" : "" end |
.truncate(string, length = 50) ⇒ Object
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# File 'lib/onebox/helpers.rb', line 171 def self.truncate(string, length = 50) string.size > length ? string[0...(string.rindex(" ", length) || length)] + "..." : string end |