discourse/lib/oneboxer.rb

87 lines
2.0 KiB
Ruby

Dir["#{Rails.root}/lib/onebox/engine/*_onebox.rb"].each {|f|
require_dependency(f.split('/')[-3..-1].join('/'))
}
module Oneboxer
# keep reloaders happy
unless defined? Oneboxer::Result
Result = Struct.new(:doc, :changed) do
def to_html
doc.to_html
end
def changed?
changed
end
end
end
def self.preview(url, options=nil)
options ||= {}
Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
Onebox.preview(url, cache: Rails.cache).placeholder_html
end
def self.onebox(url, options=nil)
options ||= {}
Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
Onebox.preview(url, cache: Rails.cache).to_s
end
def self.oneboxer_exists_for_url?(url)
Onebox.has_matcher?(url)
end
def self.invalidate(url)
Rails.cache.delete(url)
end
# Parse URLs out of HTML, returning the document when finished.
def self.each_onebox_link(string_or_doc)
doc = string_or_doc
doc = Nokogiri::HTML::fragment(doc) if doc.is_a?(String)
onebox_links = doc.search("a.onebox")
if onebox_links.present?
onebox_links.each do |link|
if link['href'].present?
yield link['href'], link
end
end
end
doc
end
def self.apply(string_or_doc)
doc = string_or_doc
doc = Nokogiri::HTML::fragment(doc) if doc.is_a?(String)
changed = false
Oneboxer.each_onebox_link(doc) do |url, element|
onebox, preview = yield(url,element)
if onebox
parsed_onebox = Nokogiri::HTML::fragment(onebox)
next unless parsed_onebox.children.count > 0
# special logic to strip empty p elements
if element.parent &&
element.parent.node_name.downcase == "p" &&
element.parent.children.count == 1 &&
parsed_onebox.children.first.name.downcase == "div"
element = element.parent
end
changed = true
element.swap parsed_onebox.to_html
end
end
Result.new(doc, changed)
end
end