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# frozen_string_literal: true
module Banzai
module Filter
# Replaces placeholders for broadcast messages with data from the current
# user or the instance.
class BroadcastMessagePlaceholdersFilter < HTML::Pipeline::Filter
def call
return doc unless context[:broadcast_message_placeholders]
doc.traverse { |node| replace_placeholders(node) }
end
private
def replace_placeholders(node)
if node.text? && !node.content.empty?
node.content = replace_content(node.content)
elsif href = link_href(node)
href.value = replace_content(href.value, url_safe_encoding: true)
end
node
end
def link_href(node)
node.element? &&
node.name == 'a' &&
node.attribute_nodes.find { |a| a.name == "href" }
end
def replace_content(content, url_safe_encoding: false)
placeholders.each do |placeholder, method|
regex = Regexp.new("{{#{placeholder}}}|#{CGI.escape("{{#{placeholder}}}")}")
value = url_safe_encoding ? CGI.escape(method.call.to_s) : method.call.to_s
content.gsub!(regex, value)
end
content
end
def placeholders
{
"email" => -> { current_user.try(:email) },
"name" => -> { current_user.try(:name) },
"user_id" => -> { current_user.try(:id) },
"username" => -> { current_user.try(:username) },
"instance_id" => -> { Gitlab::CurrentSettings.try(:uuid) }
}
end
def current_user
context[:current_user]
end
end
end
end
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