281 lines
8.0 KiB
Ruby
281 lines
8.0 KiB
Ruby
# frozen_string_literal: true
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class TopicEmbed < ActiveRecord::Base
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include Trashable
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belongs_to :topic
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belongs_to :post
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validates_presence_of :embed_url
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validates_uniqueness_of :embed_url
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before_validation(on: :create) do
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unless (topic_embed = TopicEmbed.with_deleted.where('deleted_at IS NOT NULL AND embed_url = ?', embed_url).first).nil?
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topic_embed.destroy!
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end
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end
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class FetchResponse
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attr_accessor :title, :body, :author
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end
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def self.normalize_url(url)
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url.downcase.sub(/\/$/, '').sub(/\-+/, '-').strip
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end
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def self.imported_from_html(url)
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"\n<hr>\n<small>#{I18n.t('embed.imported_from', link: "<a href='#{url}'>#{url}</a>")}</small>\n"
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end
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# Import an article from a source (RSS/Atom/Other)
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def self.import(user, url, title, contents)
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return unless url =~ /^https?\:\/\//
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if SiteSetting.embed_truncate
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contents = first_paragraph_from(contents)
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end
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contents ||= ''
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contents = +contents << imported_from_html(url)
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url = normalize_url(url)
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embed = TopicEmbed.find_by("lower(embed_url) = ?", url)
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content_sha1 = Digest::SHA1.hexdigest(contents)
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post = nil
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# If there is no embed, create a topic, post and the embed.
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if embed.blank?
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Topic.transaction do
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eh = EmbeddableHost.record_for_url(url)
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cook_method = if SiteSetting.embed_support_markdown
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Post.cook_methods[:regular]
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else
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Post.cook_methods[:raw_html]
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end
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create_args = {
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title: title,
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raw: absolutize_urls(url, contents),
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skip_validations: true,
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cook_method: cook_method,
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category: eh.try(:category_id)
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}
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if SiteSetting.embed_unlisted?
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create_args[:visible] = false
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end
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creator = PostCreator.new(user, create_args)
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post = creator.create
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if post.present?
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TopicEmbed.create!(topic_id: post.topic_id,
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embed_url: url,
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content_sha1: content_sha1,
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post_id: post.id)
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end
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end
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else
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absolutize_urls(url, contents)
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post = embed.post
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# Update the topic if it changed
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if post&.topic
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if post.user != user
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PostOwnerChanger.new(
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post_ids: [post.id],
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topic_id: post.topic_id,
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new_owner: user,
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acting_user: Discourse.system_user
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).change_owner!
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# make sure the post returned has the right author
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post.reload
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end
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if (content_sha1 != embed.content_sha1) || (title && title != post&.topic&.title)
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changes = { raw: absolutize_urls(url, contents) }
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changes[:title] = title if title.present?
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post.revise(user, changes, skip_validations: true, bypass_rate_limiter: true)
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embed.update!(content_sha1: content_sha1)
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end
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end
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end
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post
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end
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def self.find_remote(url)
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require 'ruby-readability'
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url = UrlHelper.escape_uri(url)
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original_uri = URI.parse(url)
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fd = FinalDestination.new(
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url,
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validate_uri: true,
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max_redirects: 5
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)
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url = fd.resolve
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return if url.blank?
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opts = {
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tags: %w[div p code pre h1 h2 h3 b em i strong a img ul li ol blockquote],
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attributes: %w[href src class],
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remove_empty_nodes: false
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}
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opts[:whitelist] = SiteSetting.allowed_embed_selectors if SiteSetting.allowed_embed_selectors.present?
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opts[:blacklist] = SiteSetting.blocked_embed_selectors if SiteSetting.blocked_embed_selectors.present?
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allowed_embed_classnames = SiteSetting.allowed_embed_classnames if SiteSetting.allowed_embed_classnames.present?
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response = FetchResponse.new
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begin
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html = open(url, allow_redirections: :safe).read
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rescue OpenURI::HTTPError, Net::OpenTimeout
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return
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end
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raw_doc = Nokogiri::HTML5(html)
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auth_element = raw_doc.at('meta[@name="author"]')
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if auth_element.present?
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response.author = User.where(username_lower: auth_element[:content].strip).first
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end
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read_doc = Readability::Document.new(html, opts)
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title = +(raw_doc.title || '')
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title.strip!
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if SiteSetting.embed_title_scrubber.present?
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title.sub!(Regexp.new(SiteSetting.embed_title_scrubber), '')
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title.strip!
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end
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response.title = title
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doc = Nokogiri::HTML5(read_doc.content)
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tags = { 'img' => 'src', 'script' => 'src', 'a' => 'href' }
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doc.search(tags.keys.join(',')).each do |node|
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url_param = tags[node.name]
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src = node[url_param]
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unless (src.nil? || src.empty?)
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begin
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uri = URI.parse(UrlHelper.escape_uri(src))
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unless uri.host
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uri.scheme = original_uri.scheme
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uri.host = original_uri.host
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node[url_param] = uri.to_s
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end
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rescue URI::Error
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# If there is a mistyped URL, just do nothing
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end
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end
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# only allow classes in the allowlist
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allowed_classes = if allowed_embed_classnames.blank? then [] else allowed_embed_classnames.split(/[ ,]+/i) end
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doc.search('[class]:not([class=""])').each do |classnode|
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classes = classnode[:class].split(' ').select { |classname| allowed_classes.include?(classname) }
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if classes.length === 0
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classnode.delete('class')
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else
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classnode[:class] = classes.join(' ')
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end
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end
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end
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response.body = doc.to_html
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response
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end
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def self.import_remote(import_user, url, opts = nil)
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opts = opts || {}
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response = find_remote(url)
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return if response.nil?
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response.title = opts[:title] if opts[:title].present?
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import_user = response.author if response.author.present?
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TopicEmbed.import(import_user, url, response.title, response.body)
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end
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# Convert any relative URLs to absolute. RSS is annoying for this.
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def self.absolutize_urls(url, contents)
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url = normalize_url(url)
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begin
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uri = URI(UrlHelper.escape_uri(url))
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rescue URI::Error
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return contents
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end
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prefix = "#{uri.scheme}://#{uri.host}"
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prefix += ":#{uri.port}" if uri.port != 80 && uri.port != 443
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fragment = Nokogiri::HTML5.fragment("<div>#{contents}</div>")
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fragment.css('a').each do |a|
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href = a['href']
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if href.present? && href.start_with?('/')
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a['href'] = "#{prefix}/#{href.sub(/^\/+/, '')}"
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end
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end
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fragment.css('img').each do |a|
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src = a['src']
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if src.present? && src.start_with?('/')
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a['src'] = "#{prefix}/#{src.sub(/^\/+/, '')}"
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end
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end
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fragment.at('div').inner_html
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end
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def self.topic_id_for_embed(embed_url)
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embed_url = normalize_url(embed_url).sub(/^https?\:\/\//, '')
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TopicEmbed.where("embed_url ~* ?", "^https?://#{Regexp.escape(embed_url)}$").pluck_first(:topic_id)
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end
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def self.first_paragraph_from(html)
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doc = Nokogiri::HTML5(html)
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result = +""
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doc.css('p').each do |p|
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if p.text.present?
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result << p.to_s
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return result if result.size >= 100
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end
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end
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return result unless result.blank?
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# If there is no first paragaph, return the first div (onebox)
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doc.css('div').first.to_s
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end
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def self.expanded_for(post)
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Discourse.cache.fetch("embed-topic:#{post.topic_id}", expires_in: 10.minutes) do
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url = TopicEmbed.where(topic_id: post.topic_id).pluck_first(:embed_url)
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response = TopicEmbed.find_remote(url)
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body = response.body
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body << TopicEmbed.imported_from_html(url)
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body
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end
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end
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def self.open(uri, **kwargs)
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URI.open(uri, **kwargs)
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end
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end
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# == Schema Information
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#
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# Table name: topic_embeds
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#
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# id :integer not null, primary key
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# topic_id :integer not null
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# post_id :integer not null
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# embed_url :string(1000) not null
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# content_sha1 :string(40)
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# created_at :datetime not null
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# updated_at :datetime not null
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# deleted_at :datetime
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# deleted_by_id :integer
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#
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# Indexes
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#
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# index_topic_embeds_on_embed_url (embed_url) UNIQUE
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#
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