* New hook: secrets-scanner
Add a secrets-scanner hook that scans files modified during a Copilot
coding agent session for leaked secrets, credentials, and sensitive data.
The hook runs on sessionEnd and inspects files in one of three scopes:
- diff: only files changed in the current session (default)
- staged: only files currently staged in the git index
- all: every tracked file in the repository
Detected pattern categories:
- AWS access keys and secret keys
- GCP service account credentials
- Azure client secrets and storage connection strings
- GitHub personal access tokens
- Slack tokens (bot, user, webhook)
- Private key headers (RSA, EC, DSA, OpenSSH, PEM)
- Generic high-entropy bearer tokens
- Internal IP:port strings
Configurable via environment variables (SCAN_MODE, SCAN_SCOPE,
SECRETS_ALLOWLIST) so teams can tune for their workflow without
editing the script. Patterns are POSIX ERE (grep -E) compatible,
with no PCRE metacharacters, for portability across macOS and Linux.
Files: hooks.json, scan-secrets.sh, README.md
* refactor: move PATTERNS array to top of scan-secrets.sh for discoverability
Move the PATTERNS declaration to the top of the file so it is clearly
visible and easy to customize, as suggested in code review. Added a
descriptive header comment. No functional changes.
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Co-authored-by: Shehab Sherif <shehabsherif0@users.noreply.github.com>
