441 lines
14 KiB
Ruby
441 lines
14 KiB
Ruby
# frozen_string_literal: true
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require 'uri'
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Dir["#{Rails.root}/lib/onebox/engine/*_onebox.rb"].sort.each { |f| require f }
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module Oneboxer
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ONEBOX_CSS_CLASS = "onebox"
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AUDIO_REGEX = /^\.(mp3|og[ga]|opus|wav|m4[abpr]|aac|flac)$/i
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VIDEO_REGEX = /^\.(mov|mp4|webm|m4v|3gp|ogv|avi|mpeg|ogv)$/i
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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.ignore_redirects
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@ignore_redirects ||= ['http://www.dropbox.com', 'http://store.steampowered.com', 'http://vimeo.com', Discourse.base_url]
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end
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def self.force_get_hosts
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@force_get_hosts ||= ['http://us.battle.net', 'https://news.yahoo.com/']
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end
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def self.force_custom_user_agent_hosts
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SiteSetting.force_custom_user_agent_hosts.split('|')
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end
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def self.allowed_post_types
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@allowed_post_types ||= [Post.types[:regular], Post.types[:moderator_action]]
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end
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def self.preview(url, options = nil)
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options ||= {}
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invalidate(url) if options[:invalidate_oneboxes]
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onebox_raw(url, options)[: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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invalidate(url) if options[:invalidate_oneboxes]
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onebox_raw(url, options)[:onebox]
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end
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def self.cached_onebox(url)
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if c = Discourse.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 = Discourse.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.invalidate(url)
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Discourse.cache.delete(onebox_cache_key(url))
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Discourse.cache.delete(onebox_failed_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, extra_paths: [])
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doc = string_or_doc
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doc = Nokogiri::HTML5::fragment(doc) if doc.is_a?(String)
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onebox_links = doc.css("a.#{ONEBOX_CSS_CLASS}", *extra_paths)
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if onebox_links.present?
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onebox_links.each do |link|
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yield(link['href'], link) if link['href'].present?
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end
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end
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doc
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end
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HTML5_BLOCK_ELEMENTS ||= %w{address article aside blockquote canvas center dd div dl dt fieldset figcaption figure footer form h1 h2 h3 h4 h5 h6 header hgroup hr li main nav noscript ol output p pre section table tfoot ul video}
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def self.apply(string_or_doc, extra_paths: nil)
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doc = string_or_doc
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doc = Nokogiri::HTML5::fragment(doc) if doc.is_a?(String)
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changed = false
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each_onebox_link(doc, extra_paths: extra_paths) do |url, element|
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onebox, _ = yield(url, element)
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next if onebox.blank?
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parsed_onebox = Nokogiri::HTML5::fragment(onebox)
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next if parsed_onebox.children.blank?
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changed = true
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parent = element.parent
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if parent&.node_name&.downcase == "p" &&
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parsed_onebox.children.any? { |child| HTML5_BLOCK_ELEMENTS.include?(child.node_name.downcase) }
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siblings = parent.children
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element_idx = siblings.find_index(element)
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before_idx = first_significant_element_index(siblings, element_idx - 1, -1)
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after_idx = first_significant_element_index(siblings, element_idx + 1, +1)
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if before_idx < 0 && after_idx >= siblings.size
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parent.replace parsed_onebox
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elsif before_idx < 0
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parent.children = siblings[after_idx..siblings.size]
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parent.add_previous_sibling(parsed_onebox)
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elsif after_idx >= siblings.size
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parent.children = siblings[0..before_idx]
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parent.add_next_sibling(parsed_onebox)
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else
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parent_rest = parent.dup
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parent.children = siblings[0..before_idx]
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parent_rest.children = siblings[after_idx..siblings.size]
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parent.add_next_sibling(parent_rest)
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parent.add_next_sibling(parsed_onebox)
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end
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else
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element.replace parsed_onebox
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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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def self.first_significant_element_index(elements, index, step)
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while index >= 0 && index < elements.size &&
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(elements[index].node_name.downcase == "br" ||
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(elements[index].node_name.downcase == "text" && elements[index].to_html.strip.blank?))
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index = index + step
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end
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index
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end
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def self.is_previewing?(user_id)
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Discourse.redis.get(preview_key(user_id)) == "1"
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end
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def self.preview_onebox!(user_id)
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Discourse.redis.setex(preview_key(user_id), 1.minute, "1")
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end
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def self.onebox_previewed!(user_id)
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Discourse.redis.del(preview_key(user_id))
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end
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def self.engine(url)
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Onebox::Matcher.new(url, {
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allowed_iframe_regexes: Onebox::Engine.origins_to_regexes(allowed_iframe_origins)
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}).oneboxed
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end
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def self.recently_failed?(url)
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Discourse.cache.read(onebox_failed_cache_key(url)).present?
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end
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def self.cache_failed!(url)
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Discourse.cache.write(onebox_failed_cache_key(url), true, expires_in: 1.hour)
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end
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private
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def self.preview_key(user_id)
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"onebox:preview:#{user_id}"
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end
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def self.blank_onebox
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{ preview: "", onebox: "" }
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end
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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.onebox_failed_cache_key(url)
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"onebox_failed__#{url}"
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end
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def self.onebox_raw(url, opts = {})
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url = UrlHelper.escape_uri(url).to_s
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local_onebox(url, opts) || external_onebox(url)
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rescue => e
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# no point warning here, just cause we have an issue oneboxing a url
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# we can later hunt for failed oneboxes by searching logs if needed
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Rails.logger.info("Failed to onebox #{url} #{e} #{e.backtrace}")
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# return a blank hash, so rest of the code works
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blank_onebox
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end
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def self.local_onebox(url, opts = {})
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return unless route = Discourse.route_for(url)
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html =
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case route[:controller]
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when "uploads" then local_upload_html(url)
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when "topics" then local_topic_html(url, route, opts)
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when "users" then local_user_html(url, route)
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when "list" then local_category_html(url, route)
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end
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html = html.presence || "<a href='#{URI(url).to_s}'>#{URI(url).to_s}</a>"
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{ onebox: html, preview: html }
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end
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def self.local_upload_html(url)
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case File.extname(URI(url).path || "")
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when VIDEO_REGEX
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<<~HTML
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<div class="onebox video-onebox">
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<video width="100%" height="100%" controls="">
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<source src='#{url}'>
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<a href='#{url}'>#{url}</a>
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</video>
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</div>
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HTML
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when AUDIO_REGEX
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"<audio controls><source src='#{url}'><a href='#{url}'>#{url}</a></audio>"
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end
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end
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def self.local_topic(url, route, opts)
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if current_user = User.find_by(id: opts[:user_id])
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if current_category = Category.find_by(id: opts[:category_id])
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return unless Guardian.new(current_user).can_see_category?(current_category)
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end
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if current_topic = Topic.find_by(id: opts[:topic_id])
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return unless Guardian.new(current_user).can_see_topic?(current_topic)
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end
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end
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return unless topic = Topic.find_by(id: route[:id] || route[:topic_id])
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return if topic.private_message?
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if current_category.blank? || current_category.id != topic.category_id
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return unless Guardian.new.can_see_topic?(topic)
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end
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topic
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end
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def self.local_topic_html(url, route, opts)
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return unless topic = local_topic(url, route, opts)
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post_number = route[:post_number].to_i
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post = post_number > 1 ?
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topic.posts.where(post_number: post_number).first :
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topic.ordered_posts.first
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return if !post || post.hidden || !allowed_post_types.include?(post.post_type)
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if post_number > 1 && opts[:topic_id] == topic.id
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excerpt = post.excerpt(SiteSetting.post_onebox_maxlength)
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excerpt.gsub!(/[\r\n]+/, " ")
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excerpt.gsub!("[/quote]", "[quote]") # don't break my quote
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quote = "[quote=\"#{post.user.username}, topic:#{topic.id}, post:#{post.post_number}\"]\n#{excerpt}\n[/quote]"
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PrettyText.cook(quote)
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else
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args = {
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topic_id: topic.id,
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post_number: post.post_number,
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avatar: PrettyText.avatar_img(post.user.avatar_template, "tiny"),
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original_url: url,
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title: PrettyText.unescape_emoji(CGI::escapeHTML(topic.title)),
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category_html: CategoryBadge.html_for(topic.category),
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quote: PrettyText.unescape_emoji(post.excerpt(SiteSetting.post_onebox_maxlength)),
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}
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template = template("discourse_topic_onebox")
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Mustache.render(template, args)
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end
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end
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def self.local_user_html(url, route)
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username = route[:username] || ""
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if user = User.find_by(username_lower: username.downcase)
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name = user.name if SiteSetting.enable_names
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args = {
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user_id: user.id,
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username: user.username,
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avatar: PrettyText.avatar_img(user.avatar_template, "extra_large"),
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name: name,
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bio: user.user_profile.bio_excerpt(230),
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location: Onebox::Helpers.sanitize(user.user_profile.location),
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joined: I18n.t('joined'),
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created_at: user.created_at.strftime(I18n.t('datetime_formats.formats.date_only')),
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website: user.user_profile.website,
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website_name: UserSerializer.new(user).website_name,
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original_url: url
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}
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Mustache.render(template("discourse_user_onebox"), args)
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else
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nil
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end
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end
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def self.local_category_html(url, route)
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return unless route[:category_slug_path_with_id]
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category = Category.find_by_slug_path_with_id(route[:category_slug_path_with_id])
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if Guardian.new.can_see_category?(category)
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args = {
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url: category.url,
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name: category.name,
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color: category.color,
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logo_url: category.uploaded_logo&.url,
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description: category.description,
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has_subcategories: category.subcategories.present?,
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subcategories: category.subcategories.collect { |sc| { name: sc.name, color: sc.color, url: sc.url } }
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}
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Mustache.render(template("discourse_category_onebox"), args)
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end
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end
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def self.blocked_domains
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SiteSetting.blocked_onebox_domains.split("|")
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end
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def self.preserve_fragment_url_hosts
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@preserve_fragment_url_hosts ||= ['http://github.com']
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end
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def self.allowed_iframe_origins
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allowed = SiteSetting.allowed_onebox_iframes.split("|")
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if allowed.include?("*")
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allowed = Onebox::Engine.all_iframe_origins
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end
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allowed += SiteSetting.allowed_iframes.split("|")
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end
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def self.external_onebox(url)
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Discourse.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
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fd = FinalDestination.new(url,
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ignore_redirects: ignore_redirects,
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ignore_hostnames: blocked_domains,
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force_get_hosts: force_get_hosts,
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force_custom_user_agent_hosts: force_custom_user_agent_hosts,
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preserve_fragment_url_hosts: preserve_fragment_url_hosts)
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uri = fd.resolve
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if fd.status != :resolved
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args = { link: url }
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if fd.status == :invalid_address
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args[:error_message] = I18n.t("errors.onebox.invalid_address", hostname: fd.hostname)
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elsif fd.status_code
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args[:error_message] = I18n.t("errors.onebox.error_response", status_code: fd.status_code)
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end
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error_box = blank_onebox
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error_box[:preview] = preview_error_onebox(args)
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return error_box
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end
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return blank_onebox if uri.blank? || blocked_domains.map { |hostname| uri.hostname.match?(hostname) }.any?
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options = {
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max_width: 695,
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sanitize_config: Onebox::DiscourseOneboxSanitizeConfig::Config::DISCOURSE_ONEBOX,
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allowed_iframe_origins: allowed_iframe_origins,
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hostname: GlobalSetting.hostname,
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facebook_app_access_token: SiteSetting.facebook_app_access_token,
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}
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options[:cookie] = fd.cookie if fd.cookie
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r = Onebox.preview(uri.to_s, options)
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result = { onebox: r.to_s, preview: r&.placeholder_html.to_s }
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# NOTE: Call r.errors after calling placeholder_html
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if r.errors.any?
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missing_attributes = r.errors.keys.map(&:to_s).sort.join(I18n.t("word_connector.comma"))
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error_message = I18n.t("errors.onebox.missing_data", missing_attributes: missing_attributes, count: r.errors.keys.size)
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args = r.data.merge(error_message: error_message)
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if result[:preview].blank?
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result[:preview] = preview_error_onebox(args)
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else
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doc = Nokogiri::HTML5::fragment(result[:preview])
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aside = doc.at('aside')
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if aside
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# Add an error message to the preview that was returned
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error_fragment = preview_error_onebox_fragment(args)
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aside.add_child(error_fragment)
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result[:preview] = doc.to_html
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end
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end
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end
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result
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end
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end
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def self.preview_error_onebox(args, is_fragment = false)
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args[:title] ||= args[:link] if args[:link]
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args[:error_message] = PrettyText.unescape_emoji(args[:error_message]) if args[:error_message]
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template_name = is_fragment ? "preview_error_fragment_onebox" : "preview_error_onebox"
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Mustache.render(template(template_name), args)
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end
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def self.preview_error_onebox_fragment(args)
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preview_error_onebox(args, true)
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end
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def self.template(template_name)
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@template_cache ||= {}
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@template_cache[template_name] ||= begin
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full_path = "#{Rails.root}/lib/onebox/templates/#{template_name}.mustache"
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File.read(full_path)
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end
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end
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end
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