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#!/usr/bin/env bash
# Pre-commit hook: secret scan + syntax/lint check on staged Python files.
# Use `git commit --no-verify` to bypass for confirmed false positives.
set -u
REPO_ROOT="$(git rev-parse --show-toplevel)"
cd "$REPO_ROOT" || exit 1
# --- 1. Secret scan ---
# Patterns for common credentials. Scans only added lines in the staged diff.
#
# Two passes because case-sensitivity differs. AWS keys are uppercase, sk- keys
# lowercase, PEM headers fixed, so those match case-SENSITIVELY: under -i,
# AKIA[0-9A-Z]{16} matches any mixed-case 20-char run, which random base64 in an
# embedded image blob hits ~6% of the time per 100KB and blocks real commits.
# Only the keyword=value patterns need -i.
SECRET_PATTERNS_CS='(AKIA[0-9A-Z]{16}|sk-[a-zA-Z0-9_-]{20,}|-----BEGIN (RSA|DSA|EC|OPENSSH|PGP)( PRIVATE)?( KEY| KEY BLOCK)?-----)'
SECRET_PATTERNS_CI='(api[_-]?key|api[_-]?secret|auth[_-]?token|secret[_-]?key|bearer[_-]?token|access[_-]?token|password)[[:space:]]*[:=][[:space:]]*["'"'"'][^"'"'"']{16,}["'"'"']'
added_lines="$(git diff --cached -U0 --diff-filter=AM \
| grep '^+' | grep -v '^+++' || true)"
cs_hits="$(printf '%s\n' "$added_lines" | grep -nE "$SECRET_PATTERNS_CS" || true)"
ci_hits="$(printf '%s\n' "$added_lines" | grep -niE "$SECRET_PATTERNS_CI" || true)"
# awk dedupes lines both passes matched, keeping first-seen order.
secret_hits="$(printf '%s\n%s' "$cs_hits" "$ci_hits" \
| grep -v '^[[:space:]]*$' | awk '!seen[$0]++' || true)"
if [ -n "$secret_hits" ]; then
echo "pre-commit: potential secret in staged changes:" >&2
echo "$secret_hits" >&2
echo "" >&2
echo "Review the lines above. If this is a false positive (test fixture, documentation)," >&2
echo "bypass with: git commit --no-verify" >&2
exit 1
fi
# --- 2. Syntax check on staged Python files ---
staged_py="$(git diff --cached --name-only --diff-filter=AM \
| grep -E '\.pyi?$' || true)"
if [ -n "$staged_py" ] && command -v python3 >/dev/null 2>&1; then
failed=""
while IFS= read -r f; do
[ -z "$f" ] && continue
[ -f "$f" ] || continue
# compile() rather than py_compile so no __pycache__ lands in the tree.
if ! python3 -c 'import sys; compile(open(sys.argv[1], "rb").read(), sys.argv[1], "exec")' "$f" >/dev/null 2>&1; then
failed="${failed}${f}"$'\n'
fi
done <<< "$staged_py"
if [ -n "$failed" ]; then
printf 'pre-commit: Python syntax errors in staged files:\n\n%s\n' "$failed" >&2
echo "Run: python3 -m py_compile <file> to see the error, then re-stage." >&2
exit 1
fi
fi
# --- 3. ruff on staged Python files (when installed) ---
if [ -n "$staged_py" ] && command -v ruff >/dev/null 2>&1; then
failed=""
while IFS= read -r f; do
[ -z "$f" ] && continue
[ -f "$f" ] || continue
if ! ruff check "$f" >/dev/null 2>&1; then
failed="${failed}${f}"$'\n'
fi
done <<< "$staged_py"
if [ -n "$failed" ]; then
printf 'pre-commit: ruff failed on staged files:\n\n%s\n' "$failed" >&2
echo "Run: ruff check <file> and fix the findings, then re-stage." >&2
exit 1
fi
fi
exit 0
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