BigW Consortium Gitlab

route_map.rb 1.39 KB
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module Gitlab
  class RouteMap
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    FormatError = Class.new(StandardError)
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    def initialize(data)
      begin
        entries = YAML.safe_load(data)
      rescue
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        raise FormatError, 'Route map is not valid YAML'
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      end

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      raise FormatError, 'Route map is not an array' unless entries.is_a?(Array)
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      @map = entries.map { |entry| parse_entry(entry) }
    end

    def public_path_for_source_path(path)
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      mapping = @map.find { |mapping| mapping[:source] === path }
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      return unless mapping

      path.sub(mapping[:source], mapping[:public])
    end

    private

    def parse_entry(entry)
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      raise FormatError, 'Route map entry is not a hash' unless entry.is_a?(Hash)
      raise FormatError, 'Route map entry does not have a source key' unless entry.has_key?('source')
      raise FormatError, 'Route map entry does not have a public key' unless entry.has_key?('public')
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      source_pattern = entry['source']
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      public_path = entry['public']

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      if source_pattern.start_with?('/') && source_pattern.end_with?('/')
        source_pattern = source_pattern[1...-1].gsub('\/', '/')
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        begin
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          source_pattern = /\A#{source_pattern}\z/
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        rescue RegexpError => e
          raise FormatError, "Route map entry source is not a valid regular expression: #{e}"
        end
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      end

      {
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        source: source_pattern,
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        public: public_path
      }
    end
  end
end