Module: Legion::LLM::Inference::Steps::Classification

Includes:
Logging, Legion::Logging::Helper
Included in:
Executor
Defined in:
lib/legion/llm/inference/steps/classification.rb

Constant Summary collapse

LEVELS = 
%i[public internal confidential restricted].freeze
PII_PATTERNS_CORE = 
{
  ssn:   /\b\d{3}-\d{2}-\d{4}\b/,
  phone: /\b(?:\+?1[\s.-]?)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}\b/
}.freeze
EMAIL_PATTERN = 
/\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b/
PII_PATTERNS_EXTENDED = 
{
  ip_address:     /\b(?:\d{1,3}\.){3}\d{1,3}\b/,
  date_of_birth:  %r{\b(?:0[1-9]|1[0-2])[/-](?:0[1-9]|[12]\d|3[01])[/-](?:19|20)\d{2}\b},
  zip_code:       /\b\d{5}(?:-\d{4})?\b/,
  mrn:            /\b(?:MRN|mrn)[:\s#]?\s?\d{4,12}\b/,
  account_number: /\b(?:account|acct)[:\s#]?\s?\d{6,20}\b/i,
  license_number: /\b[A-Z]\d{3,8}\b/,
  url:            %r{\bhttps?://[^\s<>"']+}i,
  vin:            /\b[A-HJ-NPR-Z0-9]{17}\b/,
  npi_number:     /\b\d{10}\b/
}.freeze
PII_PATTERNS = 
PII_PATTERNS_CORE.merge(email: EMAIL_PATTERN).merge(PII_PATTERNS_EXTENDED).freeze
PHI_KEYWORDS = 
%w[
  patient diagnosis medication prescription
  dob date-of-birth mrn medical-record
  npi clinical treatment health-plan
  beneficiary insurance-id group-number
  lab-result radiology pathology
  admission discharge procedure
].freeze

Instance Method Summary collapse

Instance Method Details

#step_classification ⇒ Object 



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# File 'lib/legion/llm/inference/steps/classification.rb', line 46

def step_classification
  classification = @request.classification || compliance_classification_default || default_classification
  unless classification_enabled?(classification)
    log_step_debug(:classification, :skipped, reason: :disabled)
    return
  end

  declared_level = Legion::LLM::Settings.config_value(classification, :level)
  log_step_debug(:classification, :scan_start, declared_level: declared_level)
  scan            = scan_content_for_sensitive_data
  effective_level = upgrade_if_needed(declared_level, scan)
  upgraded        = effective_level != declared_level

  redact_sensitive_content(scan)
  enforce_phi_cloud_gate(effective_level)
  log_step_info(
    :classification,
    :scan_complete,
    declared_level:  declared_level,
    effective_level: effective_level,
    contains_pii:    scan[:contains_pii],
    contains_phi:    scan[:contains_phi],
    pattern_count:   scan[:patterns].size,
    upgraded:        upgraded
  )

  @enrichments['classification:scan'] = {
    declared_level:    declared_level,
    effective_level:   effective_level,
    contains_pii:      scan[:contains_pii],
    contains_phi:      scan[:contains_phi],
    detected_patterns: scan[:patterns],
    upgraded:          upgraded,
    timestamp:         Time.now
  }

  if upgraded
    @warnings << "Classification upgraded from #{declared_level} to #{effective_level}: " \
                 "sensitive patterns detected (#{scan[:patterns].join(', ')})"
  end

  @audit[:'classification:scan'] = {
    outcome:     :success,
    detail:      "level=#{effective_level}, upgraded=#{upgraded}",
    data:        { declared: declared_level, effective: effective_level, patterns: scan[:patterns] },
    duration_ms: 0,
    timestamp:   Time.now
  }

  @timeline.record(
    category:  :audit, key: 'classification:scan',
    direction: :internal, detail: "level=#{effective_level}, upgraded=#{upgraded}",
    from:      'pipeline', to: 'classification'
  )
end