296 lines
8.5 KiB
Ruby
296 lines
8.5 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)$/i
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VIDEO_REGEX = /^\.(mov|mp4|m4v|webm|ogv|3gp)$/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', 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']
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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 = 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.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, extra_paths: [])
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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.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::HTML::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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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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if element&.parent&.node_name&.downcase == "p" &&
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element.parent.children.count == 1 &&
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HTML5_BLOCK_ELEMENTS.include?(parsed_onebox.children[0].node_name.downcase)
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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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# strip empty <p> elements
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doc.css("p").each { |p| p.remove if p.children.empty? }
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Result.new(doc, changed)
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end
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def self.is_previewing?(user_id)
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$redis.get(preview_key(user_id)) == "1"
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end
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def self.preview_onebox!(user_id)
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$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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$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).oneboxed
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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_raw(url, opts = {})
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url = 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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end
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html = html.presence || "<a href='#{url}'>#{url}</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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"<video width='100%' height='100%' controls><source src='#{url}'><a href='#{url}'>#{url}</a></video>"
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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_html(url, route, opts)
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return unless 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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topic = Topic.find_by(id: route[:topic_id])
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return unless topic
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return if topic.private_message?
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if 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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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 && current_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 = File.read("#{Rails.root}/lib/onebox/templates/discourse_topic_onebox.hbs")
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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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template = File.read("#{Rails.root}/lib/onebox/templates/discourse_user_onebox.hbs")
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Mustache.render(template, 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.blacklisted_domains
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SiteSetting.onebox_domains_blacklist.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.external_onebox(url)
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Rails.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
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fd = FinalDestination.new(url, ignore_redirects: ignore_redirects, ignore_hostnames: blacklisted_domains, force_get_hosts: force_get_hosts, preserve_fragment_url_hosts: preserve_fragment_url_hosts)
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uri = fd.resolve
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return blank_onebox if uri.blank? || blacklisted_domains.map { |hostname| uri.hostname.match?(hostname) }.any?
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options = {
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cache: {},
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max_width: 695,
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sanitize_config: Onebox::DiscourseOneboxSanitizeConfig::Config::DISCOURSE_ONEBOX
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}
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options[:cookie] = fd.cookie if fd.cookie
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if Rails.env.development? && SiteSetting.port.to_i > 0
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Onebox.options = { allowed_ports: [80, 443, SiteSetting.port.to_i] }
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end
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r = Onebox.preview(uri.to_s, options)
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{ onebox: r.to_s, preview: r&.placeholder_html.to_s }
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end
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end
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end
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