76 lines
1.9 KiB
Ruby
76 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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require 'fileutils'
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module Gitlab
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module Gfm
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##
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# Class that rewrites markdown links for uploads
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#
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# Using a pattern defined in `FileUploader` it copies files to a new
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# project and rewrites all links to uploads in a given text.
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#
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#
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class UploadsRewriter
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include Gitlab::Utils::StrongMemoize
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def initialize(text, _text_html, source_project, _current_user)
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@text = text
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@source_project = source_project
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@pattern = FileUploader::MARKDOWN_PATTERN
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end
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def rewrite(target_parent)
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return @text unless needs_rewrite?
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@target_parent = target_parent
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rewritten_text = Gitlab::StringRegexMarker.new(@text).mark(@pattern) do |markdown, left:, right:, mode:|
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transform_markdown(markdown)
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end
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# MarkdownContentRewriterService relies on the text being changed _in place_.
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@text.gsub!(@text, rewritten_text)
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end
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def needs_rewrite?
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strong_memoize(:needs_rewrite) do
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@pattern.match?(@text)
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end
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end
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private
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def was_embedded?(markdown)
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markdown.starts_with?("!")
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end
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def find_file(secret, file_name)
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UploaderFinder.new(@source_project, secret, file_name).execute
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end
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def transform_markdown(markdown)
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match = @pattern.match(markdown)
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file = find_file(match[:secret], match[:file])
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# No file will be returned for a path traversal
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return '' if file.nil?
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return markdown unless file.try(:exists?)
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klass = @target_parent.is_a?(Namespace) ? NamespaceFileUploader : FileUploader
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moved = klass.copy_to(file, @target_parent)
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moved_markdown = moved.markdown_link
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# Prevents rewrite of plain links as embedded
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if was_embedded?(markdown)
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moved_markdown
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else
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moved_markdown.delete_prefix('!')
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end
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end
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end
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end
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end
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