teernisse c4e15bf082 Add shared type definitions and sensitive content redactor
Shared module consumed by both the Express server and the React client:

types.ts:
- ParsedMessage: the normalized message unit (uuid, category, content,
  toolName, toolInput, timestamp, rawIndex) that the parser emits and
  every downstream consumer (viewer, filter, export) operates on
- MessageCategory: 9-value union covering user_message, assistant_text,
  thinking, tool_call, tool_result, system_message, hook_progress,
  file_snapshot, and summary
- SessionEntry / SessionListResponse / SessionDetailResponse / ExportRequest:
  API contract types for the sessions list, session detail, and HTML
  export endpoints
- ALL_CATEGORIES, CATEGORY_LABELS, DEFAULT_HIDDEN_CATEGORIES: constants
  for the filter panel UI and presets (thinking + hook_progress hidden
  by default)

sensitive-redactor.ts:
- 34 regex patterns derived from gitleaks production config, organized
  into Tier 1 (known secret formats: AWS, GitHub, GitLab, OpenAI,
  Anthropic, HuggingFace, Perplexity, Stripe, Slack, SendGrid, Twilio,
  GCP, Azure AD, Heroku, npm, PyPI, Sentry, JWT, PEM private keys,
  generic API key assignments) and Tier 2 (PII/system info: home
  directory paths, connection strings, URLs with credentials, email
  addresses, IPv4 addresses, Bearer tokens, env var secret assignments)
- Keyword pre-filtering: each pattern declares keywords that must appear
  in the text before the expensive regex is evaluated, following the
  gitleaks performance optimization approach
- False-positive allowlists: example/test email domains, localhost/
  documentation IPs (RFC 5737), noreply@anthropic.com
- Pure functions: redactSensitiveContent returns {sanitized, count,
  categories}, redactString returns just the string, redactMessage
  returns a new ParsedMessage with content and toolInput redacted

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-29 22:55:48 -05:00
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