677 lines
21 KiB
Ruby
677 lines
21 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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DANGEROUS_BIDI_CHARACTERS = [
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"\u202A",
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"\u202B",
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"\u202C",
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"\u202D",
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"\u202E",
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"\u2066",
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"\u2067",
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"\u2068",
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"\u2069",
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].freeze
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DANGEROUS_BIDI_REGEXP = Regexp.new(DANGEROUS_BIDI_CHARACTERS.join("|")).freeze
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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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erb_name = "#{filename}.js.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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source = ERB.new(source).result(binding) if filename =~ /\.erb$/
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transpiler = DiscourseJsProcessor::Transpiler.new
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transpiled = transpiler.perform(source, "#{Rails.root}/app/assets/javascripts/", part_name)
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ctx.eval(transpiled)
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else
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# Look for vendored stuff
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vendor_root = "#{Rails.root}/vendor/assets/javascripts/"
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filename = find_file(vendor_root, part_name)
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if filename
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ctx.eval(File.read("#{vendor_root}#{filename}"))
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end
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end
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end
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def self.ctx_load_manifest(ctx, name)
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manifest = File.read("#{Rails.root}/app/assets/javascripts/#{name}")
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root_path = "#{Rails.root}/app/assets/javascripts/"
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manifest.each_line do |l|
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l = l.chomp
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if l =~ /\/\/= require (\.\/)?(.*)$/
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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: 25000, ensure_gc_after_idle: 2000)
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ctx.eval("window = {}; window.devicePixelRatio = 2;") # hack to make code think stuff is retina
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ctx.attach("rails.logger.info", proc { |err| Rails.logger.info(err.to_s) })
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ctx.attach("rails.logger.warn", proc { |err| Rails.logger.warn(err.to_s) })
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ctx.attach("rails.logger.error", proc { |err| Rails.logger.error(err.to_s) })
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ctx.eval <<~JS
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console = {
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prefix: "[PrettyText] ",
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log: function(...args){ rails.logger.info(console.prefix + args.join(" ")); },
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warn: function(...args){ rails.logger.warn(console.prefix + args.join(" ")); },
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error: function(...args){ rails.logger.error(console.prefix + args.join(" ")); }
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}
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JS
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ctx.eval("__PRETTY_TEXT = true")
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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(ctx, "#{Rails.root}/app/assets/javascripts/discourse-loader.js")
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ctx_load(ctx, "#{Rails.root}/app/assets/javascripts/handlebars-shim.js")
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ctx_load(ctx, "vendor/assets/javascripts/xss.min.js")
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ctx.load("#{Rails.root}/lib/pretty_text/vendor-shims.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-common/addon/lib/get-url")
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apply_es6_file(ctx, root_path, "discourse-common/addon/lib/object")
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apply_es6_file(ctx, root_path, "discourse-common/addon/lib/deprecated")
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apply_es6_file(ctx, root_path, "discourse-common/addon/lib/escape")
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apply_es6_file(ctx, root_path, "discourse/app/lib/to-markdown")
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apply_es6_file(ctx, root_path, "discourse/app/lib/utilities")
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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_translations
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v8.eval("__resetTranslationTree()")
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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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# Acceptable options:
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#
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# disable_emojis - Disables the emoji markdown engine.
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# features - A hash where the key is the markdown feature name and the value is a boolean to enable/disable the markdown feature.
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# The hash is merged into the default features set in pretty-text.js which can be used to add new features or disable existing features.
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# features_override - An array of markdown feature names to override the default markdown feature set. Currently used by plugins to customize what features should be enabled
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# when rendering markdown.
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# markdown_it_rules - An array of markdown rule names which will be applied to the markdown-it engine. Currently used by plugins to customize what markdown-it rules should be
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# enabled when rendering markdown.
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# topic_id - Topic id for the post being cooked.
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# user_id - User id for the post being cooked.
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# force_quote_link - Always create the link to the quoted topic for [quote] bbcode. Normally this only happens
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# if the topic_id provided is different from the [quote topic:X].
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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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# note, any additional options added to __optInput here must be
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# also be added to the buildOptions function in pretty-text.js,
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# otherwise they will be discarded
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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.featuresOverride = #{opts[:features_override].to_json};" if opts[:features_override]}
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#{"__optInput.markdownItRules = #{opts[:markdown_it_rules].to_json};" if opts[:markdown_it_rules]}
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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.customEmojiTranslation = #{Plugin::CustomEmoji.translations.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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__optInput.watchedWordsReplace = #{WordWatcher.word_matcher_regexps(:replace).to_json};
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__optInput.watchedWordsLink = #{WordWatcher.word_matcher_regexps(:link).to_json};
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__optInput.additionalOptions = #{Site.markdown_additional_options.to_json};
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JS
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if opts[:topic_id]
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buffer << "__optInput.topicId = #{opts[:topic_id].to_i};\n"
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end
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if opts[:force_quote_link]
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buffer << "__optInput.forceQuoteLink = #{opts[:force_quote_link]};\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_path,
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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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emojiCDNUrl: "#{SiteSetting.external_emoji_url.blank? ? "" : SiteSetting.external_emoji_url}",
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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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working_text = text.dup
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sanitized = markdown(working_text, options)
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doc = Nokogiri::HTML5.fragment(sanitized)
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add_nofollow = !options[:omit_nofollow] && SiteSetting.add_rel_nofollow_to_user_content
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add_rel_attributes_to_user_content(doc, add_nofollow)
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strip_hidden_unicode_bidirectional_characters(doc)
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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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scrubber = Loofah::Scrubber.new do |node|
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node.remove if node.name == 'script'
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end
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loofah_fragment = Loofah.fragment(doc.to_html)
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loofah_fragment.scrub!(scrubber).to_html
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end
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def self.strip_hidden_unicode_bidirectional_characters(doc)
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return if !DANGEROUS_BIDI_REGEXP.match?(doc.content)
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doc.css("code,pre").each do |code_tag|
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next if !DANGEROUS_BIDI_REGEXP.match?(code_tag.content)
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DANGEROUS_BIDI_CHARACTERS.each do |bidi|
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next if !code_tag.content.include?(bidi)
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formatted = "<U+#{bidi.ord.to_s(16).upcase}>"
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code_tag.inner_html = code_tag.inner_html.gsub(
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bidi,
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"<span class=\"bidi-warning\" title=\"#{I18n.t("post.hidden_bidi_character")}\">#{formatted}</span>"
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)
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end
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end
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end
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def self.add_rel_attributes_to_user_content(doc, add_nofollow)
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allowlist = []
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domains = SiteSetting.exclude_rel_nofollow_domains
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allowlist = 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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l["rel"] = "noopener" if l["target"] == "_blank"
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begin
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uri = URI(UrlHelper.encode_component(href))
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site_uri ||= URI(Discourse.base_url)
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same_domain = !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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allowlist.any? { |u| uri.host == u || uri.host.ends_with?(".#{u}") }
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l["rel"] = "noopener nofollow ugc" if add_nofollow && !same_domain
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rescue URI::Error
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# add a nofollow anyway
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l["rel"] = "noopener nofollow ugc"
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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::HTML5.fragment(html)
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# extract onebox links
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doc.css("aside.onebox[data-onebox-src]").each { |onebox| links << DetectedLink.new(onebox["data-onebox-src"], false) }
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# remove href inside quotes & oneboxes & elided part
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doc.css("aside.quote a, aside.onebox a, .elided a").remove
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# remove hotlinked images
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doc.css("a.onebox > img").each { |img| img.parent.remove }
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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] != "#"
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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/#{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::HTML5.fragment(html)
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DiscourseEvent.trigger(:reduce_excerpt, doc, options)
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strip_image_wrapping(doc)
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strip_oneboxed_media(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::HTML5.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.strip_oneboxed_media(doc)
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doc.css("audio").remove
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doc.css(".video-onebox,video").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
|
|
iframe.replace Nokogiri::HTML5.fragment("<p><a href='#{vimeo_url}'>#{vimeo_url}</a></p>")
|
|
end
|
|
end
|
|
|
|
def self.strip_secure_media(doc)
|
|
# images inside a lightbox or other link
|
|
doc.css('a[href]').each do |a|
|
|
next if !Upload.secure_media_url?(a['href'])
|
|
|
|
non_image_media = %w(video audio).include?(a&.parent&.name)
|
|
target = non_image_media ? a.parent : a
|
|
next if target.to_s.include?('stripped-secure-view-media')
|
|
|
|
next if a.css('img[src]').empty? && !non_image_media
|
|
|
|
if a.classes.include?('lightbox')
|
|
img = a.css('img[src]').first
|
|
srcset = img&.attributes['srcset']&.value
|
|
if srcset
|
|
# if available, use the first image from the srcset here
|
|
# so we get the optimized image instead of the possibly huge original
|
|
url = srcset.split(',').first
|
|
else
|
|
url = img['src']
|
|
end
|
|
a.add_next_sibling secure_media_placeholder(doc, url, width: img['width'], height: img['height'])
|
|
a.remove
|
|
else
|
|
width = non_image_media ? nil : a.at_css('img').attr('width')
|
|
height = non_image_media ? nil : a.at_css('img').attr('height')
|
|
target.add_next_sibling secure_media_placeholder(doc, a['href'], width: width, height: height)
|
|
target.remove
|
|
end
|
|
end
|
|
|
|
# images by themselves or inside a onebox
|
|
doc.css('img[src]').each do |img|
|
|
url = if img.parent.classes.include?("aspect-image") && img.attributes["srcset"].present?
|
|
|
|
# we are using the first image from the srcset here so we get the
|
|
# optimized image instead of the original, because an optimized
|
|
# image may be used for the onebox thumbnail
|
|
srcset = img.attributes["srcset"].value
|
|
srcset.split(",").first
|
|
else
|
|
img['src']
|
|
end
|
|
|
|
width = img['width']
|
|
height = img['height']
|
|
onebox_type = nil
|
|
|
|
if img.ancestors.css(".onebox-body").any?
|
|
if img.classes.include?("onebox-avatar-inline")
|
|
onebox_type = "avatar-inline"
|
|
else
|
|
onebox_type = "thumbnail"
|
|
end
|
|
end
|
|
|
|
# we always want this to be tiny and without any special styles
|
|
if img.classes.include?('site-icon')
|
|
onebox_type = nil
|
|
width = 16
|
|
height = 16
|
|
end
|
|
|
|
if Upload.secure_media_url?(url)
|
|
img.add_next_sibling secure_media_placeholder(doc, url, onebox_type: onebox_type, width: width, height: height)
|
|
img.remove
|
|
end
|
|
end
|
|
end
|
|
|
|
def self.secure_media_placeholder(doc, url, onebox_type: false, width: nil, height: nil)
|
|
data_width = width ? "data-width=#{width}" : ''
|
|
data_height = height ? "data-height=#{height}" : ''
|
|
data_onebox_type = onebox_type ? "data-onebox-type='#{onebox_type}'" : ''
|
|
<<~HTML
|
|
<div class="secure-media-notice" data-stripped-secure-media="#{url}" #{data_onebox_type} #{data_width} #{data_height}>
|
|
#{I18n.t('emails.secure_media_placeholder')} <a class='stripped-secure-view-media' href="#{url}">#{I18n.t("emails.view_redacted_media")}</a>.
|
|
</div>
|
|
HTML
|
|
end
|
|
|
|
def self.format_for_email(html, post = nil)
|
|
doc = Nokogiri::HTML5.fragment(html)
|
|
DiscourseEvent.trigger(:reduce_cooked, doc, post)
|
|
strip_secure_media(doc) if post&.with_secure_media?
|
|
strip_image_wrapping(doc)
|
|
convert_vimeo_iframes(doc)
|
|
make_all_links_absolute(doc)
|
|
doc.to_html
|
|
end
|
|
|
|
protected
|
|
|
|
class JavaScriptError < StandardError
|
|
attr_accessor :message, :backtrace
|
|
|
|
def initialize(message, backtrace)
|
|
@message = message
|
|
@backtrace = backtrace
|
|
end
|
|
|
|
end
|
|
|
|
def self.protect
|
|
rval = nil
|
|
@mutex.synchronize do
|
|
rval = yield
|
|
end
|
|
rval
|
|
end
|
|
|
|
def self.ctx_load(ctx, *files)
|
|
files.each do |file|
|
|
ctx.load(app_root + file)
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
USER_TYPE ||= 'user'
|
|
GROUP_TYPE ||= 'group'
|
|
GROUP_MENTIONABLE_TYPE ||= 'group-mentionable'
|
|
|
|
def self.add_mentions(doc, user_id: nil)
|
|
elements = doc.css("span.mention")
|
|
names = elements.map { |element| element.text[1..-1] }
|
|
|
|
mentions = lookup_mentions(names, user_id: user_id)
|
|
|
|
elements.each do |element|
|
|
name = element.text[1..-1]
|
|
name.downcase!
|
|
|
|
if type = mentions[name]
|
|
element.name = 'a'
|
|
|
|
element.children = PrettyText::Helpers.format_username(
|
|
element.children.text
|
|
)
|
|
|
|
case type
|
|
when USER_TYPE
|
|
element['href'] = "#{Discourse.base_path}/u/#{UrlHelper.encode_component(name)}"
|
|
when GROUP_MENTIONABLE_TYPE
|
|
element['class'] = 'mention-group notify'
|
|
element['href'] = "#{Discourse.base_path}/groups/#{UrlHelper.encode_component(name)}"
|
|
when GROUP_TYPE
|
|
element['class'] = 'mention-group'
|
|
element['href'] = "#{Discourse.base_path}/groups/#{UrlHelper.encode_component(name)}"
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
def self.lookup_mentions(names, user_id: nil)
|
|
return {} if names.blank?
|
|
|
|
sql = <<~SQL
|
|
(
|
|
SELECT
|
|
:user_type AS type,
|
|
username_lower AS name
|
|
FROM users
|
|
WHERE username_lower IN (:names) AND staged = false
|
|
)
|
|
UNION
|
|
(
|
|
SELECT
|
|
:group_type AS type,
|
|
lower(name) AS name
|
|
FROM groups
|
|
)
|
|
UNION
|
|
(
|
|
SELECT
|
|
:group_mentionable_type AS type,
|
|
lower(name) AS name
|
|
FROM groups
|
|
WHERE lower(name) IN (:names) AND (#{Group.mentionable_sql_clause(include_public: false)})
|
|
)
|
|
ORDER BY type
|
|
SQL
|
|
|
|
user = User.find_by(id: user_id)
|
|
names.each(&:downcase!)
|
|
|
|
results = DB.query(sql,
|
|
names: names,
|
|
user_type: USER_TYPE,
|
|
group_type: GROUP_TYPE,
|
|
group_mentionable_type: GROUP_MENTIONABLE_TYPE,
|
|
levels: Group.alias_levels(user),
|
|
user_id: user_id
|
|
)
|
|
|
|
mentions = {}
|
|
results.each { |result| mentions[result.name] = result.type }
|
|
mentions
|
|
end
|
|
|
|
end
|