318 lines
9.9 KiB
Ruby
318 lines
9.9 KiB
Ruby
require 'v8'
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require 'nokogiri'
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module PrettyText
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def self.whitelist
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{
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elements: %w[
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a abbr aside b bdo blockquote br caption cite code col colgroup dd div del dfn dl
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dt em hr figcaption figure h1 h2 h3 h4 h5 h6 hgroup i img ins kbd li mark
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ol p pre q rp rt ruby s samp small span strike strong sub sup table tbody td
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tfoot th thead time tr u ul var wbr
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],
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attributes: {
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:all => ['dir', 'lang', 'title', 'class'],
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'aside' => ['data-post', 'data-full', 'data-topic'],
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'a' => ['href'],
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'blockquote' => ['cite'],
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'col' => ['span', 'width'],
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'colgroup' => ['span', 'width'],
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'del' => ['cite', 'datetime'],
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'img' => ['align', 'alt', 'height', 'src', 'width'],
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'ins' => ['cite', 'datetime'],
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'ol' => ['start', 'reversed', 'type'],
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'q' => ['cite'],
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'span' => ['style'],
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'table' => ['summary', 'width', 'style', 'cellpadding', 'cellspacing'],
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'td' => ['abbr', 'axis', 'colspan', 'rowspan', 'width', 'style'],
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'th' => ['abbr', 'axis', 'colspan', 'rowspan', 'scope', 'width', 'style'],
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'time' => ['datetime', 'pubdate'],
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'ul' => ['type']
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},
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protocols: {
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'a' => {'href' => ['ftp', 'http', 'https', 'mailto', :relative]},
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'blockquote' => {'cite' => ['http', 'https', :relative]},
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'del' => {'cite' => ['http', 'https', :relative]},
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'img' => {'src' => ['http', 'https', :relative]},
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'ins' => {'cite' => ['http', 'https', :relative]},
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'q' => {'cite' => ['http', 'https', :relative]}
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}
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}
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end
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class Helpers
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# function here are available to v8
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def avatar_template(username)
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return "" unless username
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user = User.where(username_lower: username.downcase).first
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if user
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user.avatar_template
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end
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end
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def is_username_valid(username)
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return false unless username
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username = username.downcase
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return User.exec_sql('select 1 from users where username_lower = ?', username).values.length == 1
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end
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end
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@mutex = Mutex.new
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def self.mention_matcher
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Regexp.new("(\@[a-zA-Z0-9_]{#{User.username_length.begin},#{User.username_length.end}})")
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end
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def self.app_root
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Rails.root
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end
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def self.v8
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return @ctx unless @ctx.nil?
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@ctx = V8::Context.new
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@ctx["helpers"] = Helpers.new
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@ctx.load(app_root + "app/assets/javascripts/external/md5.js")
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@ctx.load(app_root + "app/assets/javascripts/external/Markdown.Converter.js")
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@ctx.load(app_root + "app/assets/javascripts/external/twitter-text-1.5.0.js")
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@ctx.load(app_root + "lib/headless-ember.js")
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@ctx.load(app_root + "app/assets/javascripts/external/rsvp.js")
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@ctx.load(Rails.configuration.ember.handlebars_location)
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#@ctx.load(Rails.configuration.ember.ember_location)
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@ctx.load(app_root + "app/assets/javascripts/external_production/sugar-1.3.5.js")
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@ctx.eval("var Discourse = {}; Discourse.SiteSettings = #{SiteSetting.client_settings_json};")
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@ctx.eval("var window = {}; window.devicePixelRatio = 2;") # hack to make code think stuff is retina
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@ctx.load(app_root + "app/assets/javascripts/discourse/components/bbcode.js")
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@ctx.load(app_root + "app/assets/javascripts/discourse/components/utilities.js")
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@ctx.load(app_root + "app/assets/javascripts/discourse/components/markdown.js")
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# Load server side javascripts
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if DiscoursePluginRegistry.server_side_javascripts.present?
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DiscoursePluginRegistry.server_side_javascripts.each do |ssjs|
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@ctx.load(ssjs)
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end
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end
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@ctx['quoteTemplate'] = File.open(app_root + 'app/assets/javascripts/discourse/templates/quote.js.shbrs') {|f| f.read}
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@ctx['quoteEmailTemplate'] = File.open(app_root + 'lib/assets/quote_email.js.shbrs') {|f| f.read}
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@ctx.eval("HANDLEBARS_TEMPLATES = {
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'quote': Handlebars.compile(quoteTemplate),
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'quote_email': Handlebars.compile(quoteEmailTemplate),
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};")
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@ctx
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end
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def self.markdown(text, opts=nil)
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# we use the exact same markdown converter as the client
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# TODO: use the same extensions on both client and server (in particular the template for mentions)
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baked = nil
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@mutex.synchronize do
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# we need to do this to work in a multi site environment, many sites, many settings
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v8.eval("Discourse.SiteSettings = #{SiteSetting.client_settings_json};")
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v8.eval("Discourse.BaseUrl = 'http://#{RailsMultisite::ConnectionManagement.current_hostname}';")
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v8.eval("Discourse.getURL = function(url) {return '#{Discourse::base_uri}' + url};")
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v8['opts'] = opts || {}
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v8['raw'] = text
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v8.eval('opts["mentionLookup"] = function(u){return helpers.is_username_valid(u);}')
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v8.eval('opts["lookupAvatar"] = function(p){return Discourse.Utilities.avatarImg({username: p, size: "tiny", avatarTemplate: helpers.avatar_template(p)});}')
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baked = v8.eval('Discourse.Markdown.markdownConverter(opts).makeHtml(raw)')
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end
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# we need some minimal server side stuff, apply CDN and TODO filter disallowed markup
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baked = apply_cdn(baked, Rails.configuration.action_controller.asset_host)
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baked
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end
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# leaving this here, cause it invokes v8, don't want to implement twice
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def self.avatar_img(username, size)
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r = nil
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@mutex.synchronize do
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v8['username'] = username
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v8['size'] = size
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v8.eval("Discourse.SiteSettings = #{SiteSetting.client_settings_json};")
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v8.eval("Discourse.CDN = '#{Rails.configuration.action_controller.asset_host}';")
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v8.eval("Discourse.BaseUrl = '#{RailsMultisite::ConnectionManagement.current_hostname}';")
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r = v8.eval("Discourse.Utilities.avatarImg({ username: username, size: size });")
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end
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r
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end
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def self.apply_cdn(html, url)
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return html unless url
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image = /\.(jpg|jpeg|gif|png|tiff|tif)$/
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doc = Nokogiri::HTML.fragment(html)
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doc.css("a").each do |l|
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href = l.attributes["href"].to_s
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if href[0] == '/' && href =~ image
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l["href"] = url + href
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end
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end
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doc.css("img").each do |l|
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src = l.attributes["src"].to_s
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if src[0] == '/'
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l["src"] = url + src
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end
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end
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doc.to_s
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end
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def self.cook(text, opts={})
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cloned = opts.dup
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# we have a minor inconsistency
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cloned[:topicId] = opts[:topic_id]
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sanitized = Sanitize.clean(markdown(text.dup, cloned), PrettyText.whitelist)
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if SiteSetting.add_rel_nofollow_to_user_content
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sanitized = add_rel_nofollow_to_user_content(sanitized)
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end
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sanitized
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end
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def self.add_rel_nofollow_to_user_content(html)
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whitelist = []
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l = SiteSetting.exclude_rel_nofollow_domains
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if l.present?
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whitelist = l.split(",")
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end
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site_uri = nil
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doc = Nokogiri::HTML.fragment(html)
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doc.css("a").each do |l|
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href = l["href"].to_s
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begin
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uri = URI(href)
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site_uri ||= URI(Discourse.base_url)
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if !uri.host.present? ||
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uri.host.ends_with?(site_uri.host) ||
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whitelist.any?{|u| uri.host.ends_with?(u)}
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# we are good no need for nofollow
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else
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l["rel"] = "nofollow"
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end
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rescue URI::InvalidURIError
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# add a nofollow anyway
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l["rel"] = "nofollow"
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end
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end
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doc.to_html
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end
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def self.extract_links(html)
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doc = Nokogiri::HTML.fragment(html)
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links = []
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doc.css("a").each do |l|
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links << l.attributes["href"].to_s
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end
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doc.css("aside.quote").each do |a|
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topic_id = a.attributes['data-topic']
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url = "/t/topic/#{topic_id}"
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if post_number = a.attributes['data-post']
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url << "/#{post_number}"
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end
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links << url
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end
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links
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end
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class ExcerptParser < Nokogiri::XML::SAX::Document
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class DoneException < StandardError; end
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attr_reader :excerpt
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def initialize(length,options)
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@length = length
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@excerpt = ""
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@current_length = 0
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@strip_links = options[:strip_links] == true
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end
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def self.get_excerpt(html, length, options)
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me = self.new(length,options)
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parser = Nokogiri::HTML::SAX::Parser.new(me)
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begin
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parser.parse(html) unless html.nil?
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rescue DoneException
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# we are done
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end
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me.excerpt
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end
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def start_element(name, attributes=[])
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case name
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when "img"
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attributes = Hash[*attributes.flatten]
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if attributes["alt"]
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characters("[#{attributes["alt"]}]")
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elsif attributes["title"]
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characters("[#{attributes["title"]}]")
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else
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characters("[image]")
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end
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when "a"
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unless @strip_links
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c = "<a "
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c << attributes.map{|k,v| "#{k}='#{v}'"}.join(' ')
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c << ">"
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characters(c, false, false, false)
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@in_a = true
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end
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when "aside"
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@in_quote = true
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end
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end
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def end_element(name)
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case name
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when "a"
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unless @strip_links
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characters("</a>",false, false, false)
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@in_a = false
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end
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when "p", "br"
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characters(" ")
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when "aside"
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@in_quote = false
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end
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end
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def characters(string, truncate = true, count_it = true, encode = true)
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return if @in_quote
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encode = encode ? lambda{|s| ERB::Util.html_escape(s)} : lambda {|s| s}
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if count_it && @current_length + string.length > @length
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length = [0, @length - @current_length - 1].max
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@excerpt << encode.call(string[0..length]) if truncate
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@excerpt << "…"
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@excerpt << "</a>" if @in_a
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raise DoneException.new
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end
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@excerpt << encode.call(string)
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@current_length += string.length if count_it
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end
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end
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def self.excerpt(html, max_length, options={})
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ExcerptParser.get_excerpt(html, max_length, options)
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end
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end
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