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require 'fileutils'
module Gitlab
module Gfm
##
# Class that rewrites markdown links for uploads
#
# Using a pattern defined in `FileUploader` it copies files to a new
# project and rewrites all links to uploads in in a given text.
#
#
class UploadsRewriter
def initialize(text, source_project, _current_user)
@text = text
@source_project = source_project
@pattern = FileUploader::MARKDOWN_PATTERN
end
def rewrite(target_project)
return @text unless needs_rewrite?
@text.gsub(@pattern) do |markdown|
file = find_file(@source_project, $~[:secret], $~[:file])
break markdown unless file.try(:exists?)
new_uploader = FileUploader.new(target_project)
with_link_in_tmp_dir(file.file) do |open_tmp_file|
new_uploader.store!(open_tmp_file)
end
new_uploader.markdown_link
end
end
def needs_rewrite?
files.any?
end
def files
referenced_files = @text.scan(@pattern).map do
find_file(@source_project, $~[:secret], $~[:file])
end
referenced_files.compact.select(&:exists?)
end
private
def find_file(project, secret, file)
uploader = FileUploader.new(project, secret: secret)
uploader.retrieve_from_store!(file)
uploader.file
end
# Because the uploaders use 'move_to_store' we must have a temporary
# file that is allowed to be (re)moved.
def with_link_in_tmp_dir(file)
dir = Dir.mktmpdir('UploadsRewriter', File.dirname(file))
# The filename matters to Carrierwave so we make sure to preserve it
tmp_file = File.join(dir, File.basename(file))
File.link(file, tmp_file)
# Open the file to placate Carrierwave
File.open(tmp_file) { |open_file| yield open_file }
ensure
FileUtils.rm_rf(dir)
end
end
end
end
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