discourse/lib/onebox/open_graph.rb

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# frozen_string_literal: true
module Onebox
class OpenGraph
attr_reader :data
def initialize(doc)
@data = extract(doc)
end
def title
get(:title, 80)
end
def title_attr
!title.nil? ? "title='#{title}'" : ""
end
def secure_image_url
secure_url = URI(get(:image))
secure_url.scheme = 'https'
secure_url.to_s
end
def method_missing(attr, *args, &block)
value = get(attr, *args)
return nil if Onebox::Helpers::blank?(value)
method_name = attr.to_s
if method_name.end_with?(*integer_suffixes)
value.to_i
elsif method_name.end_with?(*url_suffixes)
result = Onebox::Helpers.normalize_url_for_output(value)
result unless Onebox::Helpers::blank?(result)
else
value
end
end
def get(attr, length = nil, sanitize = true)
return nil if Onebox::Helpers::blank?(data)
value = data[attr]
return nil if Onebox::Helpers::blank?(value)
value = html_entities.decode(value)
value = Sanitize.fragment(value) if sanitize
value.strip!
value = Onebox::Helpers.truncate(value, length) unless length.nil?
value
end
private
def integer_suffixes
['width', 'height']
end
def url_suffixes
['url', 'image', 'video']
end
def html_entities
@html_entities ||= HTMLEntities.new
end
def extract(doc)
return {} if Onebox::Helpers::blank?(doc)
data = {}
doc.css('meta').each do |m|
if (m["property"] && m["property"][/^(?:og|article|product):(.+)$/i]) || (m["name"] && m["name"][/^(?:og|article|product):(.+)$/i])
value = (m["content"] || m["value"]).to_s
data[$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
data[:title] ||= title_element.text unless Onebox::Helpers.blank?(title_element.text)
end
data
end
end
end