Module: Idempo::RequestFingerprint

Defined in:
lib/idempo/request_fingerprint.rb

Class Method Summary collapse

Class Method Details

.call(idempotency_key, rack_request) ⇒ Object 



2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
# File 'lib/idempo/request_fingerprint.rb', line 2

def self.call(idempotency_key, rack_request)
  d = Digest::SHA256.new
  d << idempotency_key << "\n"
  d << rack_request.url << "\n"
  d << rack_request.request_method << "\n"
  d << rack_request.get_header("HTTP_AUTHORIZATION").to_s << "\n"

  # Under Rack 3.0 the rack.input may or may not be rewindable (this is done to support
  # streaming HTTP request bodies). If we know a request body is rewindable we can read it
  # out in full and add it to the request fingerprint. If the request body cannot be
  # rewound, we can't really rely on it as it can be fairly large (and we want the
  # downstream app to read the request body, not us).
  if rack_request.env["rack.input"].respond_to?(:rewind)
    read_and_rewind(rack_request.env["rack.input"], d)
  end

  Base64.strict_encode64(d.digest)
end

.read_and_rewind(source_io, to_destination_io) ⇒ Object 



21
22
23
24
25
26
27
 
# File 'lib/idempo/request_fingerprint.rb', line 21

def self.read_and_rewind(source_io, to_destination_io)
  while (chunk = source_io.read(1024 * 65))
    to_destination_io << chunk
  end
ensure
  source_io.rewind
end