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# frozen_string_literal: true
# This service passes Markdown content through our GFM rewriter classes
# which rewrite references to GitLab objects and uploads within the content
# based on their visibility by the `target_parent`.
class MarkdownContentRewriterService
include Gitlab::Utils::StrongMemoize
REWRITERS = [Gitlab::Gfm::ReferenceRewriter, Gitlab::Gfm::UploadsRewriter].freeze
def initialize(current_user, object, field, source_parent, target_parent)
@current_user = current_user
@source_parent = source_parent
@target_parent = target_parent
@object = object
@field = field
validate_parameters!
@content = object[field].dup.presence
@html_field = object.cached_markdown_fields.html_field(field)
@content_html = object.cached_html_for(field)
@rewriters =
REWRITERS.map do |rewriter_class|
rewriter_class.new(@content, content_html, source_parent, current_user)
end
@result = {
field => nil,
html_field => nil
}.with_indifferent_access
end
def execute
return result unless content
unless safe_to_copy_markdown?
rewriters.each do |rewriter|
rewriter.rewrite(target_parent)
end
end
result[field] = content
result[html_field] = content_html if safe_to_copy_markdown?
result[:skip_markdown_cache_validation] = safe_to_copy_markdown?
result
end
def safe_to_copy_markdown?
strong_memoize(:safe_to_copy_markdown) do
rewriters.none?(&:needs_rewrite?)
end
end
private
def validate_parameters!
# See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39654#note_399095117
raise ArgumentError, 'The rewriter classes require that `source_parent` is a `Project`' \
unless source_parent.is_a?(Project)
if object.cached_markdown_fields[field].nil?
raise ArgumentError, 'The `field` attribute does not contain cached markdown'
end
end
attr_reader :current_user, :content, :source_parent,
:target_parent, :rewriters, :content_html,
:field, :html_field, :object, :result
end
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