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module Banzai
module Filter
# HTML filter that gathers all referenced records that the current user has
# permission to view.
#
# Expected to be run in its own post-processing pipeline.
#
class ReferenceGathererFilter < HTML::Pipeline::Filter
def initialize(*)
super
result[:references] ||= Hash.new { |hash, type| hash[type] = [] }
end
def call
Querying.css(doc, 'a.gfm').each do |node|
gather_references(node)
end
load_lazy_references unless ReferenceExtractor.lazy?
doc
end
private
def gather_references(node)
return unless node.has_attribute?('data-reference-filter')
reference_type = node.attr('data-reference-filter')
reference_filter = Banzai::Filter.const_get(reference_type)
return if context[:reference_filter] && reference_filter != context[:reference_filter]
return if author && !reference_filter.user_can_reference?(author, node, context)
return unless reference_filter.user_can_see_reference?(current_user, node, context)
references = reference_filter.referenced_by(node)
return unless references
references.each do |type, values|
Array.wrap(values).each do |value|
result[:references][type] << value
end
end
end
def load_lazy_references
refs = result[:references]
refs.each do |type, values|
refs[type] = ReferenceExtractor.lazily(values)
end
end
def current_user
context[:current_user]
end
def author
context[:author]
end
end
end
end
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