mirror of
https://github.com/discourse/discourse.git
synced 2024-12-19 15:25:59 +08:00
692e0140e2
This PR enables custom email dark mode styles by default that were added here.
There is currently poor support for dark mode queries in mail clients. The main beneficiary of these changes will be Apple Mail and Outlook.
Enjoy the darkness 🕶️
433 lines
17 KiB
Ruby
433 lines
17 KiB
Ruby
# 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
|
|
MAX_IMAGE_DIMENSION = 400
|
|
ONEBOX_IMAGE_BASE_STYLE = "max-height: 80%; max-width: 20%; height: auto; float: left; margin-right: 10px;"
|
|
ONEBOX_IMAGE_THUMBNAIL_STYLE = "width: 60px;"
|
|
ONEBOX_INLINE_AVATAR_STYLE = "width: 20px; height: 20px; float: none; vertical-align: middle;"
|
|
|
|
@@plugin_callbacks = []
|
|
|
|
attr_accessor :fragment
|
|
|
|
delegate :css, to: :fragment
|
|
|
|
def initialize(html, opts = nil)
|
|
@html = html
|
|
@opts = opts || {}
|
|
@fragment = Nokogiri::HTML5.parse(@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.compiled_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('aside.quote', 'border-left: 5px solid #e9e9e9; background-color: #f8f8f8; margin: 0;')
|
|
|
|
style('blockquote', 'border-left: 5px solid #e9e9e9; background-color: #f8f8f8; margin-left: 0; padding: 12px;')
|
|
|
|
# Oneboxes
|
|
style('aside.onebox', "border: 5px solid #e9e9e9; padding: 12px 25px 12px 12px; margin-bottom: 10px;")
|
|
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)', ONEBOX_IMAGE_BASE_STYLE)
|
|
style('aside.onebox .onebox-body img.thumbnail', ONEBOX_IMAGE_THUMBNAIL_STYLE)
|
|
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 .added', "color: #090;")
|
|
style('.github-info .removed', "color: #e45735;")
|
|
style('.github-info div', "display: inline; margin-right: 10px;")
|
|
style('.github-icon-container', 'float: left;')
|
|
style('.github-icon-container *', 'fill: #646464; width: 40px; height: 40px;')
|
|
style('.github-body-container', 'font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; margin-top: 1em !important;')
|
|
style('.onebox-avatar-inline', ONEBOX_INLINE_AVATAR_STYLE)
|
|
|
|
@fragment.css('.github-body-container .excerpt').remove
|
|
|
|
@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?("<p") ? original_node.css('blockquote').inner_html : "<p style='padding: 0;'>#{original_node.css('blockquote').inner_html}</p>"
|
|
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 blocklisted...
|
|
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(Nokogiri::HTML5.fragment("<p><a href='#{src_uri.to_s}'>#{CGI.escapeHTML(display_src)}</a><p>"))
|
|
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_highlight_first
|
|
reset_tables
|
|
|
|
html_lang = SiteSetting.default_locale.sub("_", "-")
|
|
style('html', nil, lang: html_lang, 'xml:lang' => html_lang)
|
|
style('body', "line-height: 1.4; 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('blockquote > :first-child', 'margin-top: 0;')
|
|
style('blockquote > :last-child', 'margin-bottom: 0;')
|
|
style('blockquote > p', 'padding: 0;')
|
|
|
|
style('.with-accent-colors', "background-color: #{SiteSetting.email_accent_bg_color}; color: #{SiteSetting.email_accent_fg_color};")
|
|
style('h4', 'color: #222;')
|
|
style('h3', 'margin: 30px 0 10px;')
|
|
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: #f9f9f9; padding: 2px 5px;')
|
|
style('pre code', 'display: block; background-color: #f9f9f9; overflow: auto; padding: 5px;')
|
|
style('pre.onebox code', 'white-space: normal;')
|
|
style('pre code li', 'white-space: pre;')
|
|
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: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;text-decoration:none;font-weight:bold")
|
|
style('.username-link', "color:#{SiteSetting.email_link_color};")
|
|
style('.username-title', "color:#777;margin-left:5px;")
|
|
style('.user-title', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;text-decoration:none;margin-left:5px;color: #999;")
|
|
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;")
|
|
style('.mso-accent-link', "mso-border-alt: 6px solid #{SiteSetting.email_accent_bg_color}; background-color: #{SiteSetting.email_accent_bg_color};")
|
|
style('.reply-above-line', "font-size: 10px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;color: #b5b5b5;padding: 5px 0px 20px;border-top: 1px dotted #ddd;")
|
|
|
|
onebox_styles
|
|
plugin_styles
|
|
dark_mode_styles
|
|
|
|
style('.post-excerpt img', "max-width: 50%; max-height: #{MAX_IMAGE_DIMENSION}px;")
|
|
|
|
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 inline_secure_images(attachments, attachments_index)
|
|
stripped_media = @fragment.css('[data-stripped-secure-media]')
|
|
upload_shas = {}
|
|
stripped_media.each do |div|
|
|
url = div['data-stripped-secure-media']
|
|
filename = File.basename(url)
|
|
filename_bare = filename.gsub(File.extname(filename), "")
|
|
sha1 = filename_bare.partition('_').first
|
|
upload_shas[url] = sha1
|
|
end
|
|
uploads = Upload.select(:original_filename, :sha1).where(sha1: upload_shas.values)
|
|
|
|
stripped_media.each do |div|
|
|
upload = uploads.find { |upl| upl.sha1 == upload_shas[div['data-stripped-secure-media']] }
|
|
next if !upload
|
|
|
|
if attachments[attachments_index[upload.sha1]]
|
|
url = attachments[attachments_index[upload.sha1]].url
|
|
|
|
onebox_type = div['data-onebox-type']
|
|
style = if onebox_type
|
|
onebox_style = onebox_type == "avatar-inline" ? ONEBOX_INLINE_AVATAR_STYLE : ONEBOX_IMAGE_THUMBNAIL_STYLE
|
|
"#{onebox_style} #{ONEBOX_IMAGE_BASE_STYLE}"
|
|
else
|
|
calculate_width_and_height_style(div)
|
|
end
|
|
|
|
div.add_next_sibling(<<~HTML)
|
|
<img src="#{url}" data-embedded-secure-image="true" style="#{style}" />
|
|
HTML
|
|
div.remove
|
|
end
|
|
end
|
|
end
|
|
|
|
def to_html
|
|
# needs to be before class + id strip because we need to style redacted
|
|
# media and also not double-redact already redacted from lower levels
|
|
replace_secure_media_urls if SiteSetting.secure_media?
|
|
strip_classes_and_ids
|
|
replace_relative_urls
|
|
|
|
@fragment.to_html
|
|
end
|
|
|
|
def to_s
|
|
@fragment.to_s
|
|
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
|
|
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 dark_mode_styles
|
|
# When we ship the email template and its styles we strip all css classes so to give our
|
|
# dark mode styles we are including in the template a selector we add a data-attr of 'dm=value' to
|
|
# the appropriate place
|
|
style(".digest-header, .digest-topic, .digest-topic-title-wrapper, .digest-topic-stats, .popular-post-excerpt", nil, dm: "header")
|
|
style(".digest-content, .header-popular-posts, .spacer, .popular-post-spacer, .popular-post-meta, .digest-new-header, .digest-new-topic, .body", nil, dm: "body")
|
|
style(".with-accent-colors, .digest-content-header", nil, dm: "body_primary")
|
|
style(".digest-topic-body", nil, dm: "topic-body")
|
|
style(".summary-footer", nil, dm: "text-color")
|
|
style("code, pre code, blockquote", nil, dm: "bg")
|
|
end
|
|
|
|
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 calculate_width_and_height_style(div)
|
|
width = div['data-width']
|
|
height = div['data-height']
|
|
if width.present? && height.present? && height.to_i < MAX_IMAGE_DIMENSION && width.to_i < MAX_IMAGE_DIMENSION
|
|
"width: #{width}px; height: #{height}px;"
|
|
else
|
|
"max-width: 50%; max-height: #{MAX_IMAGE_DIMENSION}px;"
|
|
end
|
|
end
|
|
|
|
def replace_secure_media_urls
|
|
# strip again, this can be done at a lower level like in the user
|
|
# notification template but that may not catch everything
|
|
PrettyText.strip_secure_media(@fragment)
|
|
|
|
style('div.secure-media-notice', 'border: 5px solid #e9e9e9; padding: 5px; display: inline-block;')
|
|
style('div.secure-media-notice a', "color: #{SiteSetting.email_link_color}")
|
|
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_highlight_first
|
|
footernum = 0
|
|
@fragment.css('.footer.highlight').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')
|
|
element.delete('id')
|
|
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
|