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