/usr/lib/ruby/vendor_ruby/action_dispatch/middleware/request_id.rb is in ruby-actionpack 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | require 'securerandom'
require 'active_support/core_ext/string/access'
module ActionDispatch
# Makes a unique request id available to the action_dispatch.request_id env variable (which is then accessible through
# ActionDispatch::Request#uuid) and sends the same id to the client via the X-Request-Id header.
#
# The unique request id is either based on the X-Request-Id header in the request, which would typically be generated
# by a firewall, load balancer, or the web server, or, if this header is not available, a random uuid. If the
# header is accepted from the outside world, we sanitize it to a max of 255 chars and alphanumeric and dashes only.
#
# The unique request id can be used to trace a request end-to-end and would typically end up being part of log files
# from multiple pieces of the stack.
class RequestId
def initialize(app)
@app = app
end
def call(env)
env["action_dispatch.request_id"] = external_request_id(env) || internal_request_id
@app.call(env).tap { |_status, headers, _body| headers["X-Request-Id"] = env["action_dispatch.request_id"] }
end
private
def external_request_id(env)
if request_id = env["HTTP_X_REQUEST_ID"].presence
request_id.gsub(/[^\w\-]/, "").first(255)
end
end
def internal_request_id
SecureRandom.uuid
end
end
end
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