diff options
Diffstat (limited to 'lib/bulk_imports/file_downloads/filename_fetch.rb')
-rw-r--r-- | lib/bulk_imports/file_downloads/filename_fetch.rb | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/bulk_imports/file_downloads/filename_fetch.rb b/lib/bulk_imports/file_downloads/filename_fetch.rb new file mode 100644 index 00000000000..b6bb0fd8c81 --- /dev/null +++ b/lib/bulk_imports/file_downloads/filename_fetch.rb @@ -0,0 +1,46 @@ +# frozen_string_literal: true + +module BulkImports + module FileDownloads + module FilenameFetch + REMOTE_FILENAME_PATTERN = %r{filename="(?<filename>[^"]+)"}.freeze + FILENAME_SIZE_LIMIT = 255 # chars before the extension + + def raise_error(message) + raise NotImplementedError + end + + private + + # Fetch the remote filename information from the request content-disposition header + # - Raises if the filename does not exist + # - If the filename is longer then 255 chars truncate it + # to be a total of 255 chars (with the extension) + # rubocop:disable Gitlab/ModuleWithInstanceVariables + def remote_filename + @remote_filename ||= begin + pattern = BulkImports::FileDownloads::FilenameFetch::REMOTE_FILENAME_PATTERN + name = response_headers['content-disposition'].to_s + .match(pattern) # matches the filename pattern + .then { |match| match&.named_captures || {} } # ensures the match is a hash + .fetch('filename') # fetches the 'filename' key or raise KeyError + + name = File.basename(name) # Ensures to remove path from the filename (../ for instance) + ensure_filename_size(name) # Ensures the filename is within the FILENAME_SIZE_LIMIT + end + rescue KeyError + raise_error 'Remote filename not provided in content-disposition header' + end + # rubocop:enable Gitlab/ModuleWithInstanceVariables + + def ensure_filename_size(filename) + limit = BulkImports::FileDownloads::FilenameFetch::FILENAME_SIZE_LIMIT + return filename if filename.length <= limit + + extname = File.extname(filename) + basename = File.basename(filename, extname)[0, limit] + "#{basename}#{extname}" + end + end + end +end |