discourse/lib/email/styles.rb

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#
# HTML emails don't support CSS, so we can use nokogiri to inline attributes based on
# matchers.
#
module Email
class Styles
@@plugin_callbacks = []
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attr_accessor :fragment
delegate :css, to: :fragment
def initialize(html, opts=nil)
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@html = html
@opts = opts || {}
@fragment = Nokogiri::HTML.fragment(@html)
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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 format_basic
uri = URI(Discourse.base_url)
# images
@fragment.css('img').each do |img|
next if img['class'] == 'site-logo'
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if img['class'] == "emoji" || img['src'] =~ /(plugins|images)\/emoji/
img['width'] = 20
img['height'] = 20
else
# use dimensions of original iPhone screen for 'too big, let device rescale'
if img['width'].to_i > 320 or img['height'].to_i > 480
img['width'] = 'auto'
img['height'] = 'auto'
end
end
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# ensure all urls are absolute
if img['src'] =~ /^\/[^\/]/
img['src'] = "#{Discourse.base_url}#{img['src']}"
end
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# ensure no schemaless urls
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if img['src'] && img['src'].starts_with?("//")
img['src'] = "#{uri.scheme}:#{img['src']}"
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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
# 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 format_notification
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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:#3b5998;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: #3b5998;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;')
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style('.rtl', 'direction: rtl;')
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style('td.body', 'padding-top:5px;', colspan: "2")
style('.whisper td.body', 'font-style: italic; color: #9c9c9c;')
style('.lightbox-wrapper .meta', 'display: none')
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correct_first_body_margin
correct_footer_style
reset_tables
onebox_styles
plugin_styles
end
def onebox_styles
# Links to other topics
style('aside.quote', 'border-left: 5px solid #e9e9e9; background-color: #f8f8f8; padding: 12px 25px 2px 12px; margin-bottom: 10px;')
style('aside.quote blockquote', 'border: 0px; padding: 0; margin: 7px 0; background-color: clear;')
style('aside.quote blockquote > p', 'padding: 0;')
style('aside.quote div.info-line', 'color: #666; margin: 10px 0')
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style('aside.quote .avatar', 'margin-right: 5px; width:20px; height:20px')
style('blockquote', 'border-left: 5px solid #e9e9e9; background-color: #f8f8f8; margin: 0;')
style('blockquote > p', 'padding: 1em;')
# Oneboxes
style('aside.onebox', "padding: 12px 25px 2px 12px; border-left: 5px solid #bebebe; background: #eee; margin-bottom: 10px;")
style('aside.onebox img', "max-height: 80%; max-width: 25%; height: auto; float: left; margin-right: 10px; margin-bottom: 10px")
style('aside.onebox h3', "border-bottom: 0")
style('aside.onebox .source', "margin-bottom: 8px")
style('aside.onebox .source a[href]', "color: #333; font-weight: normal")
style('aside.clearfix', "clear: both")
# 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 = 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 "<p><a href='#{src_uri.to_s}'>#{CGI.escapeHTML(display_src)}</a><p>"
rescue URI::InvalidURIError
# If the URL is weird, remove the iframe
i.remove
end
end
end
def format_html
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: #006699;')
style('ul', 'margin: 0 0 0 10px; padding: 0 0 0 20px;')
style('li', 'padding-bottom: 10px')
style('div.digest-post', 'margin-left: 15px; margin-top: -5px; max-width: 694px;')
style('div.digest-post h1', 'font-size: 20px;')
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style('div.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;')
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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: #006699; line-height:1.5em;')
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onebox_styles
plugin_styles
end
# this method is reserved for styles specific to plugin
def plugin_styles
@@plugin_callbacks.each { |block| block.call(@fragment, @opts) }
end
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def to_html
strip_classes_and_ids
replace_relative_urls
@fragment.to_html.tap do |result|
result.gsub!(/\[email-indent\]/, "<div style='margin-left: 15px'>")
result.gsub!(/\[\/email-indent\]/, "</div>")
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end
end
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def strip_avatars_and_emojis
@fragment.search('img').each do |img|
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if img['src'] =~ /_avatar/
img.parent['style'] = "vertical-align: top;" if img.parent.name == 'td'
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img.remove
end
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if img['title'] && (img['src'] =~ /images\/emoji/ || img['src'] =~ /uploads\/default\/_emoji/)
img.add_previous_sibling(img['title'] || "emoji")
img.remove
end
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end
@fragment.to_s
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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::InvalidURIError, URI::InvalidComponentError
# leave it
end
end
end
private
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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 =~ /^\/\/#{host}/
element['href'] = "#{scheme}:#{href}"
end
end
end
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def correct_first_body_margin
@fragment.css('.body p').each do |element|
element['style'] = "margin-top:0; border: 0;"
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end
end
def correct_footer_style
footernum = 0
@fragment.css('.footer').each do |element|
element['style'] = "color:#666;"
linknum = 0
element.css('a').each do |inner|
# we want the first footer link to be specially highlighted as IMPORTANT
if footernum == 0 and linknum == 0
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inner['style'] = "background-color: #006699; color:#ffffff; border-top: 4px solid #006699; border-right: 6px solid #006699; border-bottom: 4px solid #006699; border-left: 6px solid #006699; display: inline-block;"
else
inner['style'] = "color:#666;"
end
linknum += 1
end
footernum += 1
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end
end
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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')
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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
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end
end