# frozen_string_literal: true # # HTML emails don't support CSS, so we can use nokogiri to inline attributes based on # matchers. # module Email class Styles @@plugin_callbacks = [] attr_accessor :fragment delegate :css, to: :fragment def initialize(html, opts = nil) @html = html @opts = opts || {} @fragment = Nokogiri::HTML.fragment(@html) @custom_styles = nil end def self.register_plugin_style(&block) @@plugin_callbacks.push(block) end def add_styles(node, new_styles) existing = node['style'] if existing.present? # merge styles node['style'] = "#{new_styles}; #{existing}" else node['style'] = new_styles end end def custom_styles return @custom_styles unless @custom_styles.nil? css = EmailStyle.new.css @custom_styles = {} if !css.blank? # there is a minor race condition here, CssParser could be # loaded by ::CssParser::Parser not loaded require 'css_parser' unless defined?(::CssParser::Parser) parser = ::CssParser::Parser.new(import: false) parser.load_string!(css) parser.each_selector do |selector, value| @custom_styles[selector] ||= +'' @custom_styles[selector] << value end end @custom_styles end def format_basic uri = URI(Discourse.base_url) # Remove SVGs @fragment.css('svg, img[src$=".svg"]').remove # images @fragment.css('img').each do |img| next if img['class'] == 'site-logo' if (img['class'] && img['class']['emoji']) || (img['src'] && img['src'][/\/_?emoji\//]) img['width'] = img['height'] = 20 else # use dimensions of original iPhone screen for 'too big, let device rescale' if img['width'].to_i > (320) || img['height'].to_i > (480) img['width'] = img['height'] = 'auto' end end if img['src'] # ensure all urls are absolute img['src'] = "#{Discourse.base_url}#{img['src']}" if img['src'][/^\/[^\/]/] # ensure no schemaless urls img['src'] = "#{uri.scheme}:#{img['src']}" if img['src'][/^\/\//] end end # add max-width to big images big_images = @fragment.css('img[width="auto"][height="auto"]') - @fragment.css('aside.onebox img') - @fragment.css('img.site-logo, img.emoji') big_images.each do |img| add_styles(img, 'max-width: 100%;') if img['style'] !~ /max-width/ end # topic featured link @fragment.css('a.topic-featured-link').each do |e| e['style'] = "color:#858585;padding:2px 8px;border:1px solid #e6e6e6;border-radius:2px;box-shadow:0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);" end # attachments @fragment.css('a.attachment').each do |a| # ensure all urls are absolute if a['href'] =~ /^\/[^\/]/ a['href'] = "#{Discourse.base_url}#{a['href']}" end # ensure no schemaless urls if a['href'] && a['href'].starts_with?("//") a['href'] = "#{uri.scheme}:#{a['href']}" end end end def onebox_styles # Links to other topics style('aside.quote', 'padding: 12px 25px 2px 12px; margin-bottom: 10px;') style('aside.quote div.info-line', 'color: #666; margin: 10px 0') style('aside.quote .avatar', 'margin-right: 5px; width:20px; height:20px; vertical-align:middle;') style('blockquote', 'border-left: 5px solid #e9e9e9; background-color: #f8f8f8; margin: 0;') style('blockquote > p', 'padding: 1em;') # Oneboxes style('aside.onebox', "border: 5px solid #e9e9e9; padding: 12px 25px 12px 12px;") style('aside.onebox header img.site-icon', "width: 16px; height: 16px; margin-right: 3px;") style('aside.onebox header a[href]', "color: #222222; text-decoration: none;") style('aside.onebox .onebox-body', "clear: both") style('aside.onebox .onebox-body img:not(.onebox-avatar-inline)', "max-height: 80%; max-width: 20%; height: auto; float: left; margin-right: 10px;") style('aside.onebox .onebox-body img.thumbnail', "width: 60px;") style('aside.onebox .onebox-body h3, aside.onebox .onebox-body h4', "font-size: 1.17em; margin: 10px 0;") style('.onebox-metadata', "color: #919191") style('.github-info', "margin-top: 10px;") style('.github-info div', "display: inline; margin-right: 10px;") style('.onebox-avatar-inline', "float: none; vertical-align: middle;") @fragment.css('aside.quote blockquote > p').each do |p| p['style'] = 'padding: 0;' end # Convert all `aside.quote` tags to `blockquote`s @fragment.css('aside.quote').each do |n| original_node = n.dup original_node.search('div.quote-controls').remove blockquote = original_node.css('blockquote').inner_html.strip.start_with?("#{original_node.css('blockquote').inner_html}

" n.inner_html = original_node.css('div.title').inner_html + blockquote n.name = "blockquote" end # Finally, convert all `aside` tags to `div`s @fragment.css('aside, article, header').each do |n| n.name = "div" end # iframes can't go in emails, so replace them with clickable links @fragment.css('iframe').each do |i| begin # sometimes, iframes are blacklisted... if i["src"].blank? i.remove next end src_uri = i["data-original-href"].present? ? URI(i["data-original-href"]) : URI(i['src']) # If an iframe is protocol relative, use SSL when displaying it display_src = "#{src_uri.scheme || 'https'}://#{src_uri.host}#{src_uri.path}#{src_uri.query.nil? ? '' : '?' + src_uri.query}#{src_uri.fragment.nil? ? '' : '#' + src_uri.fragment}" i.replace "

#{CGI.escapeHTML(display_src)}

" rescue URI::Error # If the URL is weird, remove the iframe i.remove end end end def format_html correct_first_body_margin correct_footer_style correct_footer_style_hilight_first reset_tables html_lang = SiteSetting.default_locale.sub("_", "-") style('html', nil, lang: html_lang, 'xml:lang' => html_lang) style('body', "text-align:#{ Rtl.new(nil).enabled? ? 'right' : 'left' };") style('body', nil, dir: Rtl.new(nil).enabled? ? 'rtl' : 'ltr') style('.with-dir', "text-align:#{ Rtl.new(nil).enabled? ? 'right' : 'left' };", dir: Rtl.new(nil).enabled? ? 'rtl' : 'ltr' ) style('.with-accent-colors', "background-color: #{SiteSetting.email_accent_bg_color}; color: #{SiteSetting.email_accent_fg_color};") style('h4', 'color: #222;') style('h3', 'margin: 15px 0 20px 0;') style('hr', 'background-color: #ddd; height: 1px; border: 1px;') style('a', "text-decoration: none; font-weight: bold; color: #{SiteSetting.email_link_color};") style('ul', 'margin: 0 0 0 10px; padding: 0 0 0 20px;') style('li', 'padding-bottom: 10px') style('div.summary-footer', 'color:#666; font-size:95%; text-align:center; padding-top:15px;') style('span.post-count', 'margin: 0 5px; color: #777;') style('pre', 'word-wrap: break-word; max-width: 694px;') style('code', 'background-color: #f1f1ff; padding: 2px 5px;') style('pre code', 'display: block; background-color: #f1f1ff; padding: 5px;') style('.featured-topic a', "text-decoration: none; font-weight: bold; color: #{SiteSetting.email_link_color}; line-height:1.5em;") style('.summary-email', "-moz-box-sizing:border-box;-ms-text-size-adjust:100%;-webkit-box-sizing:border-box;-webkit-text-size-adjust:100%;box-sizing:border-box;color:#0a0a0a;font-family:Helvetica,Arial,sans-serif;font-size:14px;font-weight:400;line-height:1.3;margin:0;min-width:100%;padding:0;width:100%") style('.previous-discussion', 'font-size: 17px; color: #444; margin-bottom:10px;') style('.notification-date', "text-align:right;color:#999999;padding-right:5px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;font-size:11px") style('.username', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;color:#{SiteSetting.email_link_color};text-decoration:none;font-weight:bold") style('.user-title', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;text-decoration:none;margin-left:7px;color: #999;") style('.user-name', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;text-decoration:none;margin-left:7px;color: #{SiteSetting.email_link_color};font-weight:normal;") style('.post-wrapper', "margin-bottom:25px;") style('.user-avatar', 'vertical-align:top;width:55px;') style('.user-avatar img', nil, width: '45', height: '45') style('hr', 'background-color: #ddd; height: 1px; border: 1px;') style('.rtl', 'direction: rtl;') style('div.body', 'padding-top:5px;') style('.whisper div.body', 'font-style: italic; color: #9c9c9c;') style('.lightbox-wrapper .meta', 'display: none') style('div.undecorated-link-footer a', "font-weight: normal;") onebox_styles plugin_styles style('.post-excerpt img', "max-width: 50%; max-height: 400px;") format_custom end def format_custom custom_styles.each do |selector, value| style(selector, value) end end # this method is reserved for styles specific to plugin def plugin_styles @@plugin_callbacks.each { |block| block.call(@fragment, @opts) } end def to_html strip_classes_and_ids replace_relative_urls @fragment.to_html end def strip_avatars_and_emojis @fragment.search('img').each do |img| next unless img['src'] if img['src'][/_avatar/] img.parent['style'] = "vertical-align: top;" if img.parent&.name == 'td' img.remove end if img['title'] && img['src'][/\/_?emoji\//] img.add_previous_sibling(img['title'] || "emoji") img.remove end end @fragment.to_s end def make_all_links_absolute site_uri = URI(Discourse.base_url) @fragment.css("a").each do |link| begin link["href"] = "#{site_uri}#{link['href']}" unless URI(link["href"].to_s).host.present? rescue URI::Error # leave it end end end private def replace_relative_urls forum_uri = URI(Discourse.base_url) host = forum_uri.host scheme = forum_uri.scheme @fragment.css('[href]').each do |element| href = element['href'] if href.start_with?("\/\/#{host}") element['href'] = "#{scheme}:#{href}" end end end def correct_first_body_margin @fragment.css('div.body p').each do |element| element['style'] = "margin-top:0; border: 0;" end end def correct_footer_style @fragment.css('.footer').each do |element| element['style'] = "color:#666;" element.css('a').each do |inner| inner['style'] = "color:#666;" end end end def correct_footer_style_hilight_first footernum = 0 @fragment.css('.footer.hilight').each do |element| linknum = 0 element.css('a').each do |inner| # we want the first footer link to be specially highlighted as IMPORTANT if footernum == (0) && linknum == (0) bg_color = SiteSetting.email_accent_bg_color inner['style'] = "background-color: #{bg_color}; color: #{SiteSetting.email_accent_fg_color}; border-top: 4px solid #{bg_color}; border-right: 6px solid #{bg_color}; border-bottom: 4px solid #{bg_color}; border-left: 6px solid #{bg_color}; display: inline-block; font-weight: bold;" end return end return end end def strip_classes_and_ids @fragment.css('*').each do |element| element.delete('class'.freeze) element.delete('id'.freeze) end end def reset_tables style('table', nil, cellspacing: '0', cellpadding: '0', border: '0') end def style(selector, style, attribs = {}) @fragment.css(selector).each do |element| add_styles(element, style) if style attribs.each do |k, v| element[k] = v end end end end end