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# frozen_string_literal: true
module Banzai
module Filter
# HTML filter that "fixes" links to pages/files in a wiki.
# Rewrite rules are documented in the `WikiPipeline` spec.
#
# Context options:
# :project_wiki
class WikiLinkFilter < HTML::Pipeline::Filter
def call
return doc unless project_wiki?
doc.search('a:not(.gfm)').each { |el| process_link_attr(el.attribute('href')) }
doc.search('video').each { |el| process_link_attr(el.attribute('src')) }
doc.search('img').each do |el|
attr = el.attribute('data-src') || el.attribute('src')
process_link_attr(attr)
end
doc
end
protected
def project_wiki?
!context[:project_wiki].nil?
end
def process_link_attr(html_attr)
return if html_attr.blank?
html_attr.value = apply_rewrite_rules(html_attr.value)
rescue URI::Error, Addressable::URI::InvalidURIError
# noop
end
def apply_rewrite_rules(link_string)
Rewriter.new(link_string, wiki: context[:project_wiki], slug: context[:page_slug]).apply_rules
end
end
end
end
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