Module: Clickwrap::SubjectFingerprint

Defined in:
lib/clickwrap/subject_fingerprint.rb

Overview

One implementation of the aggregate subject fingerprint used by presentation, remediation, capture, and verification. A security binding implemented four nearly-identical ways eventually becomes four different bindings; this is deliberately the only path.

Class Method Summary collapse

Class Method Details

.for(policy, subject) ⇒ Object 



11
12
13
14
15
16
17
18
19
 
# File 'lib/clickwrap/subject_fingerprint.rb', line 11

def for(policy, subject)
  fingerprints = policy.statements.filter_map do |statement|
    next unless statement.subject_bound?

    [statement.key, for_statement(statement, subject)]
  end.to_h

  fingerprints.empty? ? nil : Digest.digest_canonical(fingerprints)
end

.for_statement(statement, subject) ⇒ Object 



21
22
23
24
25
26
 
# File 'lib/clickwrap/subject_fingerprint.rb', line 21

def for_statement(statement, subject)
  return nil if subject.nil?

  value = statement.subject_fingerprint_with.call(subject)
  value.nil? ? nil : Digest.digest(value.to_s)
end