505 lines
14 KiB
Ruby
505 lines
14 KiB
Ruby
# frozen_string_literal: true
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require 'mini_racer'
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require 'nokogiri'
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require 'erb'
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module PrettyText
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@mutex = Mutex.new
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@ctx_init = Mutex.new
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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.find_file(root, filename)
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return filename if File.file?("#{root}#{filename}")
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es6_name = "#{filename}.js.es6"
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return es6_name if File.file?("#{root}#{es6_name}")
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js_name = "#{filename}.js"
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return js_name if File.file?("#{root}#{js_name}")
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erb_name = "#{filename}.js.es6.erb"
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return erb_name if File.file?("#{root}#{erb_name}")
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end
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def self.apply_es6_file(ctx, root_path, part_name)
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filename = find_file(root_path, part_name)
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if filename
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source = File.read("#{root_path}#{filename}")
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if filename =~ /\.erb$/
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source = ERB.new(source).result(binding)
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end
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template = Tilt::ES6ModuleTranspilerTemplate.new {}
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transpiled = template.module_transpile(source, "#{Rails.root}/app/assets/javascripts/", part_name)
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ctx.eval(transpiled)
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else
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# Look for vendored stuff
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vendor_root = "#{Rails.root}/vendor/assets/javascripts/"
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filename = find_file(vendor_root, part_name)
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if filename
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ctx.eval(File.read("#{vendor_root}#{filename}"))
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end
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end
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end
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def self.ctx_load_manifest(ctx, name)
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manifest = File.read("#{Rails.root}/app/assets/javascripts/#{name}")
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root_path = "#{Rails.root}/app/assets/javascripts/"
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manifest.each_line do |l|
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l = l.chomp
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if l =~ /\/\/= require (\.\/)?(.*)$/
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apply_es6_file(ctx, root_path, Regexp.last_match[2])
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elsif l =~ /\/\/= require_tree (\.\/)?(.*)$/
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path = Regexp.last_match[2]
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Dir["#{root_path}/#{path}/**"].sort.each do |f|
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apply_es6_file(ctx, root_path, f.sub(root_path, '')[1..-1].sub(/\.js.es6$/, ''))
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end
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end
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end
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end
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def self.create_es6_context
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ctx = MiniRacer::Context.new(timeout: 15000)
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ctx.eval("window = {}; window.devicePixelRatio = 2;") # hack to make code think stuff is retina
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if Rails.env.development? || Rails.env.test?
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ctx.attach("console.log", proc { |l| p l })
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ctx.eval('window.console = console;')
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end
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ctx.eval("__PRETTY_TEXT = true")
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ctx_load(ctx, "#{Rails.root}/app/assets/javascripts/discourse-loader.js")
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ctx_load(ctx, "vendor/assets/javascripts/lodash.js")
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ctx_load_manifest(ctx, "pretty-text-bundle.js")
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ctx_load_manifest(ctx, "markdown-it-bundle.js")
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root_path = "#{Rails.root}/app/assets/javascripts/"
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apply_es6_file(ctx, root_path, "discourse/lib/to-markdown")
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apply_es6_file(ctx, root_path, "discourse/lib/utilities")
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PrettyText::Helpers.instance_methods.each do |method|
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ctx.attach("__helpers.#{method}", PrettyText::Helpers.method(method))
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end
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ctx.load("#{Rails.root}/lib/pretty_text/shims.js")
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ctx.eval("__setUnicode(#{Emoji.unicode_replacements_json})")
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to_load = []
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DiscoursePluginRegistry.each_globbed_asset do |a|
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to_load << a if File.file?(a) && a =~ /discourse-markdown/
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end
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to_load.uniq.each do |f|
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if f =~ /^.+assets\/javascripts\//
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root = Regexp.last_match[0]
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apply_es6_file(ctx, root, f.sub(root, '').sub(/\.js\.es6$/, ''))
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end
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end
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DiscoursePluginRegistry.vendored_core_pretty_text.each do |vpt|
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ctx.eval(File.read(vpt))
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end
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DiscoursePluginRegistry.vendored_pretty_text.each do |vpt|
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ctx.eval(File.read(vpt))
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end
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ctx
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end
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def self.v8
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return @ctx if @ctx
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# ensure we only init one of these
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@ctx_init.synchronize do
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return @ctx if @ctx
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@ctx = create_es6_context
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end
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@ctx
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end
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def self.reset_context
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@ctx_init.synchronize do
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@ctx&.dispose
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@ctx = nil
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end
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end
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def self.markdown(text, opts = {})
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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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text = text || ""
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protect do
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context = v8
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custom_emoji = {}
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Emoji.custom.map { |e| custom_emoji[e.name] = e.url }
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buffer = +<<~JS
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__optInput = {};
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__optInput.siteSettings = #{SiteSetting.client_settings_json};
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#{"__optInput.disableEmojis = true" if opts[:disable_emojis]}
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__paths = #{paths_json};
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__optInput.getURL = __getURL;
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#{"__optInput.features = #{opts[:features].to_json};" if opts[:features]}
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__optInput.getCurrentUser = __getCurrentUser;
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__optInput.lookupAvatar = __lookupAvatar;
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__optInput.lookupPrimaryUserGroup = __lookupPrimaryUserGroup;
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__optInput.formatUsername = __formatUsername;
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__optInput.getTopicInfo = __getTopicInfo;
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__optInput.categoryHashtagLookup = __categoryLookup;
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__optInput.customEmoji = #{custom_emoji.to_json};
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__optInput.emojiUnicodeReplacer = __emojiUnicodeReplacer;
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__optInput.lookupUploadUrls = __lookupUploadUrls;
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__optInput.censoredRegexp = #{WordWatcher.word_matcher_regexp(:censor)&.source.to_json};
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JS
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if opts[:topicId]
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buffer << "__optInput.topicId = #{opts[:topicId].to_i};\n"
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end
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if opts[:user_id]
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buffer << "__optInput.userId = #{opts[:user_id].to_i};\n"
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end
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buffer << "__textOptions = __buildOptions(__optInput);\n"
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buffer << ("__pt = new __PrettyText(__textOptions);")
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# Be careful disabling sanitization. We allow for custom emails
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if opts[:sanitize] == false
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buffer << ('__pt.disableSanitizer();')
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end
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opts = context.eval(buffer)
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DiscourseEvent.trigger(:markdown_context, context)
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baked = context.eval("__pt.cook(#{text.inspect})")
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end
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baked
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end
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def self.paths_json
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paths = {
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baseUri: Discourse::base_uri,
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CDN: Rails.configuration.action_controller.asset_host,
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}
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if SiteSetting.Upload.enable_s3_uploads
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if SiteSetting.Upload.s3_cdn_url.present?
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paths[:S3CDN] = SiteSetting.Upload.s3_cdn_url
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end
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paths[:S3BaseUrl] = Discourse.store.absolute_base_url
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end
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paths.to_json
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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(avatar_template, size)
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protect do
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v8.eval(<<~JS)
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__paths = #{paths_json};
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__utils.avatarImg({size: #{size.inspect}, avatarTemplate: #{avatar_template.inspect}}, __getURL);
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JS
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end
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end
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def self.unescape_emoji(title)
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return title unless SiteSetting.enable_emoji? && title
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set = SiteSetting.emoji_set.inspect
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custom = Emoji.custom.map { |e| [e.name, e.url] }.to_h.to_json
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protect do
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v8.eval(<<~JS)
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__paths = #{paths_json};
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__performEmojiUnescape(#{title.inspect}, {
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getURL: __getURL,
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emojiSet: #{set},
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customEmoji: #{custom},
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enableEmojiShortcuts: #{SiteSetting.enable_emoji_shortcuts},
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inlineEmoji: #{SiteSetting.enable_inline_emoji_translation}
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});
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JS
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end
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end
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def self.escape_emoji(title)
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return unless title
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replace_emoji_shortcuts = SiteSetting.enable_emoji && SiteSetting.enable_emoji_shortcuts
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protect do
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v8.eval(<<~JS)
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__performEmojiEscape(#{title.inspect}, {
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emojiShortcuts: #{replace_emoji_shortcuts},
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inlineEmoji: #{SiteSetting.enable_inline_emoji_translation}
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});
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JS
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end
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end
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def self.cook(text, opts = {})
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options = opts.dup
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# we have a minor inconsistency
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options[:topicId] = opts[:topic_id]
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working_text = text.dup
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sanitized = markdown(working_text, options)
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doc = Nokogiri::HTML.fragment(sanitized)
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if !options[:omit_nofollow] && SiteSetting.add_rel_nofollow_to_user_content
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add_rel_nofollow_to_user_content(doc)
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end
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if SiteSetting.enable_mentions
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add_mentions(doc, user_id: opts[:user_id])
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end
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doc.to_html
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end
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def self.add_rel_nofollow_to_user_content(doc)
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whitelist = []
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domains = SiteSetting.exclude_rel_nofollow_domains
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whitelist = domains.split('|') if domains.present?
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site_uri = nil
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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 == site_uri.host ||
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uri.host.ends_with?(".#{site_uri.host}") ||
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whitelist.any? { |u| uri.host == u || uri.host.ends_with?(".#{u}") }
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# we are good no need for nofollow
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l.remove_attribute("rel")
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else
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l["rel"] = "nofollow noopener"
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end
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rescue URI::Error
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# add a nofollow anyway
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l["rel"] = "nofollow noopener"
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end
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end
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end
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class DetectedLink < Struct.new(:url, :is_quote); end
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def self.extract_links(html)
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links = []
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doc = Nokogiri::HTML.fragment(html)
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# remove href inside quotes & elided part
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doc.css("aside.quote a, .elided a").each { |a| a["href"] = "" }
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# extract all links
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doc.css("a").each do |a|
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if a["href"].present? && a["href"][0] != "#".freeze
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links << DetectedLink.new(a["href"], false)
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end
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end
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# extract quotes
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doc.css("aside.quote[data-topic]").each do |aside|
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if aside["data-topic"].present?
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url = +"/t/topic/#{aside["data-topic"]}"
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url << "/#{aside["data-post"]}" if aside["data-post"].present?
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links << DetectedLink.new(url, true)
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end
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end
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# extract Youtube links
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doc.css("div[data-youtube-id]").each do |div|
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if div["data-youtube-id"].present?
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links << DetectedLink.new("https://www.youtube.com/watch?v=#{div['data-youtube-id']}", false)
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end
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end
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links
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end
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def self.excerpt(html, max_length, options = {})
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# TODO: properly fix this HACK in ExcerptParser without introducing XSS
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doc = Nokogiri::HTML.fragment(html)
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DiscourseEvent.trigger(:reduce_excerpt, doc, options)
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strip_image_wrapping(doc)
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html = doc.to_html
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ExcerptParser.get_excerpt(html, max_length, options)
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end
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def self.strip_links(string)
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return string if string.blank?
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# If the user is not basic, strip links from their bio
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fragment = Nokogiri::HTML.fragment(string)
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fragment.css('a').each { |a| a.replace(a.inner_html) }
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fragment.to_html
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end
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def self.make_all_links_absolute(doc)
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site_uri = nil
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doc.css("a").each do |link|
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href = link["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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unless uri.host.present? || href.start_with?('mailto')
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link["href"] = "#{site_uri}#{link['href']}"
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end
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rescue URI::Error
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# leave it
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end
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end
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end
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def self.strip_image_wrapping(doc)
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doc.css(".lightbox-wrapper .meta").remove
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end
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def self.convert_vimeo_iframes(doc)
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doc.css("iframe[src*='player.vimeo.com']").each do |iframe|
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if iframe["data-original-href"].present?
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vimeo_url = UrlHelper.escape_uri(iframe["data-original-href"])
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else
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vimeo_id = iframe['src'].split('/').last
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vimeo_url = "https://vimeo.com/#{vimeo_id}"
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end
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iframe.replace "<p><a href='#{vimeo_url}'>#{vimeo_url}</a></p>"
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end
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end
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def self.strip_secure_media(doc)
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doc.css("a[href]").each do |a|
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if a["href"].include?("/secure-media-uploads/") && FileHelper.is_supported_media?(a["href"])
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target = %w(video audio).include?(a&.parent&.parent&.name) ? a.parent.parent : a
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target.replace "<p class='secure-media-notice'>#{I18n.t("emails.secure_media_placeholder")}</p>"
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end
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end
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end
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def self.format_for_email(html, post = nil)
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doc = Nokogiri::HTML.fragment(html)
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DiscourseEvent.trigger(:reduce_cooked, doc, post)
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strip_secure_media(doc) if post&.with_secure_media?
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strip_image_wrapping(doc)
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convert_vimeo_iframes(doc)
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make_all_links_absolute(doc)
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doc.to_html
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end
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protected
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class JavaScriptError < StandardError
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attr_accessor :message, :backtrace
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def initialize(message, backtrace)
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@message = message
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@backtrace = backtrace
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end
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end
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def self.protect
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rval = nil
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@mutex.synchronize do
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rval = yield
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end
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rval
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end
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def self.ctx_load(ctx, *files)
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files.each do |file|
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ctx.load(app_root + file)
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end
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end
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private
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USER_TYPE ||= 'user'
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GROUP_TYPE ||= 'group'
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def self.add_mentions(doc, user_id: nil)
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elements = doc.css("span.mention")
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names = elements.map { |element| element.text[1..-1] }
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mentions = lookup_mentions(names, user_id: user_id)
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doc.css("span.mention").each do |element|
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name = element.text[1..-1]
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name.downcase!
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if type = mentions[name]
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element.name = 'a'
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element.children = PrettyText::Helpers.format_username(
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element.children.text
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)
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case type
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when USER_TYPE
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element['href'] = "#{Discourse::base_uri}/u/#{name}"
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when GROUP_TYPE
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element['class'] = 'mention-group'
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element['href'] = "#{Discourse::base_uri}/groups/#{name}"
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end
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end
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end
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end
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def self.lookup_mentions(names, user_id: nil)
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return {} if names.blank?
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sql = <<~SQL
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(
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SELECT
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:user_type AS type,
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username_lower AS name
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FROM users
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WHERE username_lower IN (:names) AND staged = false
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)
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UNION
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(
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SELECT
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:group_type AS type,
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lower(name) AS name
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FROM groups
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WHERE lower(name) IN (:names) AND (#{Group.mentionable_sql_clause})
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)
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SQL
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user = User.find_by(id: user_id)
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names.each(&:downcase!)
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results = DB.query(sql,
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names: names,
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user_type: USER_TYPE,
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group_type: GROUP_TYPE,
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levels: Group.alias_levels(user),
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user_id: user_id
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)
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mentions = {}
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results.each { |result| mentions[result.name] = result.type }
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mentions
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end
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end
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