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Contents
module HTML
class Pipeline
# This filter rewrites image tags with a max-width inline style and also wraps
# the image in an <a> tag that causes the full size image to be opened in a
# new tab.
#
# The max-width inline styles are especially useful in HTML email which
# don't use a global stylesheets.
class ImageMaxWidthFilter < Filter
def call
doc.search('img').each do |element|
# Skip if there's already a style attribute. Not sure how this
# would happen but we can reconsider it in the future.
next if element['style']
# Bail out if src doesn't look like a valid http url. trying to avoid weird
# js injection via javascript: urls.
next if element['src'].to_s.strip =~ /\Ajavascript/i
element['style'] = 'max-width:100%;'
link_image element unless has_ancestor?(element, %w[a])
end
doc
end
def link_image(element)
link = doc.document.create_element('a', href: element['src'], target: '_blank')
link.add_child(element.dup)
element.replace(link)
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems