138 lines
3.2 KiB
Ruby
138 lines
3.2 KiB
Ruby
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Dir["#{Rails.root}/lib/onebox/engine/*_onebox.rb"].each {|f|
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require_dependency(f.split('/')[-3..-1].join('/'))
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}
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module Oneboxer
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# keep reloaders happy
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unless defined? Oneboxer::Result
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Result = Struct.new(:doc, :changed) do
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def to_html
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doc.to_html
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end
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def changed?
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changed
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end
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end
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end
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def self.preview(url, options=nil)
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options ||= {}
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Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
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onebox_raw(url)[:preview]
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end
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def self.onebox(url, options=nil)
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options ||= {}
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Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
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onebox_raw(url)[:onebox]
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end
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def self.cached_onebox(url)
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if c = Rails.cache.read(onebox_cache_key(url))
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c[:onebox]
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end
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rescue => e
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invalidate(url)
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Rails.logger.warn("invalid cached onebox for #{url} #{e}")
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""
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end
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def self.cached_preview(url)
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if c = Rails.cache.read(onebox_cache_key(url))
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c[:preview]
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end
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rescue => e
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invalidate(url)
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Rails.logger.warn("invalid cached preview for #{url} #{e}")
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""
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end
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def self.oneboxer_exists_for_url?(url)
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Onebox.has_matcher?(url)
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end
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def self.invalidate(url)
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Rails.cache.delete(onebox_cache_key(url))
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end
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# Parse URLs out of HTML, returning the document when finished.
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def self.each_onebox_link(string_or_doc)
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doc = string_or_doc
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doc = Nokogiri::HTML::fragment(doc) if doc.is_a?(String)
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onebox_links = doc.search("a.onebox")
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if onebox_links.present?
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onebox_links.each do |link|
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if link['href'].present?
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yield link['href'], link
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end
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end
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end
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doc
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end
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def self.apply(string_or_doc)
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doc = string_or_doc
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doc = Nokogiri::HTML::fragment(doc) if doc.is_a?(String)
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changed = false
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Oneboxer.each_onebox_link(doc) do |url, element|
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onebox, preview = yield(url,element)
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if onebox
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parsed_onebox = Nokogiri::HTML::fragment(onebox)
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next unless parsed_onebox.children.count > 0
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# special logic to strip empty p elements
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if element.parent &&
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element.parent.node_name.downcase == "p" &&
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element.parent.children.count == 1
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element = element.parent
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end
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changed = true
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element.swap parsed_onebox.to_html
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end
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end
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Result.new(doc, changed)
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end
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private
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def self.onebox_cache_key(url)
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"onebox__#{url}"
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end
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def self.add_discourse_whitelists
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# Add custom domain whitelists
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if SiteSetting.onebox_domains_whitelist.present?
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domains = SiteSetting.onebox_domains_whitelist.split('|')
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whitelist = Onebox::Engine::WhitelistedGenericOnebox.whitelist
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whitelist.concat(domains)
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whitelist.uniq!
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end
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end
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def self.onebox_raw(url)
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Rails.cache.fetch(onebox_cache_key(url), expires_in: 1.day){
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# This might be able to move to whenever the SiteSetting changes?
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Oneboxer.add_discourse_whitelists
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r = Onebox.preview(url, cache: {}, max_width: 695)
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{
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onebox: r.to_s,
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preview: r.try(:placeholder_html).to_s
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}
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}
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rescue => e
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Discourse.handle_exception(e, message: "While trying to onebox a URL", url: url)
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# return a blank hash, so rest of the code works
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{preview: "", onebox: ""}
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end
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end
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