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# frozen_string_literal: true
module Banzai
module Filter
class WikiLinkFilter < HTML::Pipeline::Filter
class Rewriter
def initialize(link_string, wiki:, slug:)
@uri = Addressable::URI.parse(link_string)
@wiki_base_path = wiki && wiki.wiki_base_path
@slug = slug
end
def apply_rules
# Special case: relative URLs beginning with `/uploads/` refer to
# user-uploaded files will be handled elsewhere.
return @uri.to_s if public_upload?
# Special case: relative URLs beginning with Wikis::CreateAttachmentService::ATTACHMENT_PATH
# refer to user-uploaded files to the wiki repository.
unless repository_upload?
apply_file_link_rules!
apply_hierarchical_link_rules!
end
apply_relative_link_rules!
@uri.to_s
end
private
# Of the form 'file.md'
def apply_file_link_rules!
@uri = Addressable::URI.join(@slug, @uri) if @uri.extname.present?
end
# Of the form `./link`, `../link`, or similar
def apply_hierarchical_link_rules!
@uri = Addressable::URI.join(@slug, @uri) if @uri.to_s[0] == '.'
end
# Any link _not_ of the form `http://example.com/`
def apply_relative_link_rules!
if @uri.relative? && @uri.path.present?
link = ::File.join(@wiki_base_path, @uri.path)
link = "#{link}##{@uri.fragment}" if @uri.fragment
@uri = Addressable::URI.parse(link)
end
end
def public_upload?
@uri.relative? && @uri.path.starts_with?('/uploads/')
end
def repository_upload?
@uri.relative? && @uri.path.starts_with?(Wikis::CreateAttachmentService::ATTACHMENT_PATH)
end
end
end
end
end
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