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pulibrary / orangelight / 00dbc10b-d747-4ad7-b211-7b26d753abbb

14 Aug 2025 01:25PM UTC coverage: 0.483% (-94.9%) from 95.343%
00dbc10b-d747-4ad7-b211-7b26d753abbb

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Merge pull request #5181 from pulibrary/dependabot/bundler/activestorage-7.2.2.2

Bump activestorage from 7.2.2.1 to 7.2.2.2

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0.0
/lib/orangelight/middleware/invalid_parameter_handler.rb
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# frozen_string_literal: true
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# If the user enters a url that has invalid parameters
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# this middleware will return a 400 status
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# and the load balancer will display its own error page
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module Orangelight
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  module Middleware
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    class InvalidParameterHandler
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      def initialize(app)
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        @app = app
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      end
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      def call(env)
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        validate_for!(env)
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        @app.call(env)
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      rescue ActionController::BadRequest => bad_request_error
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        raise bad_request_error if raise_error?(bad_request_error.message)
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        Rails.logger.error "Invalid parameters passed in the request: #{bad_request_error} within the environment #{@request.inspect}"
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        bad_request_response(env)
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      end
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      private
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        def bad_request_body
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          'Bad Request'
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        end
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        def bad_request_headers(env)
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          {
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            'Content-Type' => "#{request_content_type(env)}; charset=#{default_charset}",
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            'Content-Length' => bad_request_body.bytesize.to_s
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          }
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        end
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        def bad_request_response(env)
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          [
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            bad_request_status,
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            bad_request_headers(env),
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            [bad_request_body]
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          ]
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        end
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        def bad_request_status
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          400
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        end
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        def default_charset
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          ActionDispatch::Response.default_charset
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        end
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        def default_content_type
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          'text/html'
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        end
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        # Check if facet fields have empty value lists
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        def facet_fields_values(params)
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          facet_parameter = params.fetch(:f, [])
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          raise ActionController::BadRequest, "Invalid facet parameter passed: #{facet_parameter}" unless facet_parameter.is_a?(Array) || facet_parameter.is_a?(Hash)
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          facet_parameter.collect do |facet_field, value_list|
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            raise ActionController::BadRequest, "Facet field #{facet_field} has a scalar value #{value_list}" if value_list.is_a?(String)
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            next unless value_list.nil?
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            raise ActionController::BadRequest, "Facet field #{facet_field} has a nil value"
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          end
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        end
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        # Check if params have key with leading or trailing whitespaces
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        def check_for_white_spaces(params)
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          params.each_key do |k|
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            next unless ((k[0].match?(/\s/) || k[-1].match?(/\s/)) && (k.is_a? String)) == true
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            raise ActionController::BadRequest, "Param '#{k}' contains a space"
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          end
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        end
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        ##
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        # Previously, we were rescuing only from exceptions we recognized.
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        # The problem with that is that there will be exceptions we don't recognize and
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        # haven't been able to diagnose (see, e.g., https://github.com/pulibrary/orangelight/issues/1455)
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        # and when those happen we want to provide the user with a graceful way forward,
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        # not just an error screen. Therefore, we should rescue all errors, log the problem,
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        # and redirect the user somewhere helpful.
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        def raise_error?(_message)
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          false
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        end
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        def request_content_type(env)
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          request = request_for(env)
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          request.formats.first || default_content_type
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        end
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        def request_for(env)
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          ActionDispatch::Request.new(env.dup)
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        end
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        def valid_message_patterns
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          [
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            /invalid %-encoding/,
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            /Facet field/,
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            /Invalid facet/,
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            /contains a space/
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          ]
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        end
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        def validate_for!(env)
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          # calling request.params is sufficient to trigger an error
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          # see https://github.com/rack/rack/issues/337#issuecomment-46453404
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          params = request_for(env).params
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          check_for_white_spaces(params)
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          facet_fields_values(params)
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        end
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    end
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  end
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end
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