228 lines
7.6 KiB
Ruby
228 lines
7.6 KiB
Ruby
#
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# HTML emails don't support CSS, so we can use nokogiri to inline attributes based on
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# matchers.
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#
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module Email
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class Styles
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@@plugin_callbacks = []
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def initialize(html, opts=nil)
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@html = html
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@opts = opts || {}
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@fragment = Nokogiri::HTML.fragment(@html)
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end
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def self.register_plugin_style(&block)
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@@plugin_callbacks.push(block)
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end
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def add_styles(node, new_styles)
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existing = node['style']
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if existing.present?
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# merge styles
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node['style'] = "#{new_styles}; #{existing}"
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else
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node['style'] = new_styles
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end
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end
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def format_basic
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uri = URI(Discourse.base_url)
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# images
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@fragment.css('img').each do |img|
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next if img['class'] == 'site-logo'
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if img['class'] == "emoji" || img['src'] =~ /plugins\/emoji/
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img['width'] = 20
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img['height'] = 20
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else
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# use dimensions of original iPhone screen for 'too big, let device rescale'
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if img['width'].to_i > 320 or img['height'].to_i > 480
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img['width'] = 'auto'
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img['height'] = 'auto'
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end
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end
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# ensure all urls are absolute
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if img['src'] =~ /^\/[^\/]/
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img['src'] = "#{Discourse.base_url}#{img['src']}"
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end
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# ensure no schemaless urls
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if img['src'] && img['src'].starts_with?("//")
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img['src'] = "#{uri.scheme}:#{img['src']}"
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end
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end
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# attachments
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@fragment.css('a.attachment').each do |a|
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# ensure all urls are absolute
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if a['href'] =~ /^\/[^\/]/
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a['href'] = "#{Discourse.base_url}#{a['href']}"
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end
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# ensure no schemaless urls
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if a['href'] && a['href'].starts_with?("//")
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a['href'] = "#{uri.scheme}:#{a['href']}"
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end
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end
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end
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def format_notification
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style('.previous-discussion', 'font-size: 17px; color: #444;')
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style('.notification-date', "text-align:right;color:#999999;padding-right:5px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;font-size:11px")
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style('.username', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;color:#3b5998;text-decoration:none;font-weight:bold")
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style('.user-title', "font-size:13px;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;text-decoration:none;margin-left:7px;color: #999;")
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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;")
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style('.post-wrapper', "margin-bottom:25px;")
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style('.user-avatar', 'vertical-align:top;width:55px;')
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style('.user-avatar img', nil, width: '45', height: '45')
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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")
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correct_first_body_margin
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correct_footer_style
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reset_tables
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onebox_styles
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plugin_styles
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end
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def onebox_styles
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# Links to other topics
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style('aside.quote', 'border-left: 5px solid #bebebe; background-color: #f1f1f1; padding: 12px 25px 2px 12px; margin-bottom: 10px;')
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style('aside.quote blockquote', 'border: 0px; padding: 0; margin: 7px 0')
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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')
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# Oneboxes
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style('aside.onebox', "padding: 12px 25px 2px 12px; border-left: 5px solid #bebebe; background: #eee; margin-bottom: 10px;")
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style('aside.onebox img', "max-height: 80%; max-width: 25%; height: auto; float: left; margin-right: 10px; margin-bottom: 10px")
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style('aside.onebox h3', "border-bottom: 0")
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style('aside.onebox .source', "margin-bottom: 8px")
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style('aside.onebox .source a[href]', "color: #333; font-weight: normal")
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style('aside.clearfix', "clear: both")
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# Finally, convert all `aside` tags to `div`s
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@fragment.css('aside, article, header').each do |n|
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n.name = "div"
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end
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# iframes can't go in emails, so replace them with clickable links
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@fragment.css('iframe').each do |i|
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begin
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src_uri = URI(i['src'])
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# If an iframe is protocol relative, use SSL when displaying it
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display_src = "#{src_uri.scheme || 'https://'}#{src_uri.host}#{src_uri.path}"
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i.replace "<p><a href='#{src_uri.to_s}'>#{display_src}</a><p>"
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rescue URI::InvalidURIError
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# If the URL is weird, remove it
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i.remove
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end
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end
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end
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def format_html
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style('h3', 'margin: 15px 0 20px 0;')
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style('hr', 'background-color: #ddd; height: 1px; border: 1px;')
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style('a', 'text-decoration: none; font-weight: bold; color: #006699;')
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style('ul', 'margin: 0 0 0 10px; padding: 0 0 0 20px;')
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style('li', 'padding-bottom: 10px')
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style('div.digest-post', 'margin-left: 15px; margin-top: -5px; max-width: 694px;')
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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;')
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style('span.post-count', 'margin: 0 5px; color: #777;')
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style('pre', 'word-wrap: break-word; max-width: 694px;')
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style('code', 'background-color: #f1f1ff; padding: 2px 5px;')
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style('pre code', 'display: block; background-color: #f1f1ff; padding: 5px;')
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style('.featured-topic a', 'text-decoration: none; font-weight: bold; color: #006699; line-height:1.5em;')
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onebox_styles
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plugin_styles
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end
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# this method is reserved for styles specific to plugin
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def plugin_styles
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@@plugin_callbacks.each { |block| block.call(@fragment, @opts) }
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end
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def to_html
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strip_classes_and_ids
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replace_relative_urls
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@fragment.to_html.tap do |result|
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result.gsub!(/\[email-indent\]/, "<div style='margin-left: 15px'>")
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result.gsub!(/\[\/email-indent\]/, "</div>")
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end
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end
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def strip_avatars_and_emojis
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@fragment.search('img').each do |img|
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if img['src'] =~ /_avatar/
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img.parent['style'] = "vertical-align: top;" if img.parent.name == 'td'
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img.remove
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end
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if img['title'] && (img['src'] =~ /images\/emoji/ || img['src'] =~ /uploads\/default\/_emoji/)
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img.add_previous_sibling(img['title'] || "emoji")
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img.remove
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end
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end
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@fragment.to_s
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end
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private
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def replace_relative_urls
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forum_uri = URI(Discourse.base_url)
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host = forum_uri.host
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scheme = forum_uri.scheme
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@fragment.css('[href]').each do |element|
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href = element['href']
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if href =~ /^\/\/#{host}/
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element['href'] = "#{scheme}:#{href}"
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end
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end
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end
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def correct_first_body_margin
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@fragment.css('.body p').each do |element|
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element['style'] = "margin-top:0; border: 0;"
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end
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end
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def correct_footer_style
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@fragment.css('.footer').each do |element|
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element['style'] = "color:#666;"
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element.css('a').each do |inner|
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inner['style'] = "color:#666;"
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end
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end
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end
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def strip_classes_and_ids
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@fragment.css('*').each do |element|
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element.delete('class')
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element.delete('id')
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end
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end
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def reset_tables
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style('table', nil, cellspacing: '0', cellpadding: '0', border: '0')
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end
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def style(selector, style, attribs = {})
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@fragment.css(selector).each do |element|
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add_styles(element, style) if style
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attribs.each do |k,v|
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element[k] = v
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end
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end
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end
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end
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end
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