Specstory Guard

#!/bin/sh
# specstory-guard pre-commit hook

set -e

REPO_ROOT=$(git rev-parse --show-toplevel 2>/dev/null || true)
if [ -z "$REPO_ROOT" ]; then
  exit 0
fi

SCAN_SCRIPT="$REPO_ROOT/skills/specstory-guard/scripts/scan.py"
if [ ! -f "$SCAN_SCRIPT" ]; then
  echo "specstory-guard: scan script not found at $SCAN_SCRIPT" >&2
  exit 1
fi

PYTHON_BIN="python3"
if ! command -v "$PYTHON_BIN" >/dev/null 2>&1; then
  PYTHON_BIN="python"
fi

if ! command -v "$PYTHON_BIN" >/dev/null 2>&1; then
  echo "specstory-guard: python not found (need python3 or python)" >&2
  exit 1
fi

"$PYTHON_BIN" "$SCAN_SCRIPT" --root "$REPO_ROOT"

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{
  "name": "specstory-guard",
  "version": "0.1.0",
  "description": "Pre-commit guardrail that scans .specstory/history for potential secrets.",
  "scope": {
    "history_dir": ".specstory/history",
    "enforcement": "pre-commit"
  },
  "entrypoints": {
    "setup": "scripts/setup.py",
    "scan": "scripts/scan.py"
  }
}

from __future__ import annotations

import os
import subprocess
import sys


USAGE = """Usage:
  python scripts/guard.py install [--force]
  python scripts/guard.py scan [--root PATH] [--history-dir PATH] [--format text|markdown]
  python scripts/guard.py uninstall
"""


def script_path(name: str) -> str:
    return os.path.abspath(os.path.join(os.path.dirname(__file__), name))


def run_python(script: str, args: list[str]) -> int:
    return subprocess.call([sys.executable, script, *args])


def main() -> int:
    args = sys.argv[1:]
    command = args[0] if args else "install"
    command_args = args[1:] if args else []

    if command in {"-h", "--help", "help"}:
        print(USAGE)
        return 0

    if command in {"scan", "check"}:
        return run_python(script_path("scan.py"), command_args)

    if command in {"install", "uninstall"}:
        return run_python(script_path("setup.py"), [command, *command_args])

    print(f"specstory-guard: unknown command '{command}'", file=sys.stderr)
    print(USAGE, file=sys.stderr)
    return 1


if __name__ == "__main__":
    raise SystemExit(main())

from __future__ import annotations

from dataclasses import dataclass
import re


@dataclass(frozen=True)
class SecretPattern:
    name: str
    regex: re.Pattern[str]


PATTERNS = [
    SecretPattern(
        name="private-key-block",
        regex=re.compile(r"-----BEGIN (?:RSA|EC|DSA|OPENSSH|PRIVATE) KEY-----"),
    ),
    SecretPattern(
        name="aws-access-key-id",
        regex=re.compile(r"\b(AKIA|ASIA)[0-9A-Z]{16}\b"),
    ),
    SecretPattern(
        name="aws-secret-access-key",
        regex=re.compile(
            r"(?i)\baws_secret_access_key\b\s*[:=]\s*['\"]?[A-Za-z0-9/+=]{40}"
        ),
    ),
    SecretPattern(
        name="github-token",
        regex=re.compile(r"\bgh[pousr]_[A-Za-z0-9]{36}\b"),
    ),
    SecretPattern(
        name="gitlab-token",
        regex=re.compile(r"\bglpat-[0-9A-Za-z\-_]{20,}\b"),
    ),
    SecretPattern(
        name="slack-token",
        regex=re.compile(r"\bxox[baprs]-[0-9A-Za-z-]{10,}\b"),
    ),
    SecretPattern(
        name="google-api-key",
        regex=re.compile(r"\bAIza[0-9A-Za-z\-_]{35}\b"),
    ),
    SecretPattern(
        name="stripe-live-key",
        regex=re.compile(r"\bsk_live_[0-9a-zA-Z]{24}\b"),
    ),
    SecretPattern(
        name="jwt",
        regex=re.compile(
            r"\beyJ[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}\b"
        ),
    ),
    SecretPattern(
        name="generic-credential-assignment",
        regex=re.compile(
            r"(?i)\b(api[_-]?key|secret|token|password)\b\s*[:=]\s*['\"]?[A-Za-z0-9_\-\/+=]{16,}"
        ),
    ),
]

ALLOWLIST = [
    re.compile(r"(?i)redacted"),
    re.compile(r"(?i)<redacted>"),
    re.compile(r"(?i)placeholder"),
    re.compile(r"(?i)example"),
    re.compile(r"(?i)dummy"),
    re.compile(r"(?i)fake"),
    re.compile(r"\b(x{4,}|\*{4,})\b"),
]

from __future__ import annotations

import argparse
import os
import re
import sys
from dataclasses import dataclass
from typing import Iterable

from patterns import ALLOWLIST, PATTERNS, SecretPattern


@dataclass(frozen=True)
class Finding:
    file_path: str
    line_number: int
    rule_name: str
    snippet: str


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="Scan .specstory/history for potential secrets.",
    )
    parser.add_argument(
        "--root",
        default=os.getcwd(),
        help="Repository root (default: current working directory)",
    )
    parser.add_argument(
        "--history-dir",
        default=None,
        help="Override history directory (relative to root)",
    )
    parser.add_argument(
        "--max-matches-per-file",
        type=int,
        default=5,
        help="Limit findings reported per file",
    )
    parser.add_argument(
        "--max-matches",
        type=int,
        default=50,
        help="Limit total findings reported",
    )
    parser.add_argument(
        "--format",
        choices=("text", "markdown"),
        default="text",
        help="Output format",
    )
    return parser.parse_args()


def resolve_history_dir(root: str, override: str | None) -> str:
    if override:
        return os.path.join(root, override)
    return os.path.join(root, ".specstory", "history")


def iter_history_files(history_dir: str) -> Iterable[str]:
    for base, _, files in os.walk(history_dir):
        for name in files:
            if name.endswith(".md"):
                yield os.path.join(base, name)


def load_user_allowlist() -> list[re.Pattern[str]]:
    raw = os.getenv("SPECSTORY_GUARD_ALLOWLIST", "").strip()
    if not raw:
        return []
    patterns: list[re.Pattern[str]] = []
    for entry in [item.strip() for item in raw.split(",") if item.strip()]:
        try:
            patterns.append(re.compile(entry))
        except re.error as exc:
            print(f"specstory-guard: invalid allowlist regex '{entry}': {exc}", file=sys.stderr)
    return patterns


def is_allowlisted(text: str, allowlist: list[re.Pattern[str]]) -> bool:
    return any(pattern.search(text) for pattern in allowlist)


def build_snippet(line: str, match: re.Match[str]) -> str:
    start, end = match.span()
    redacted = "<redacted>"
    snippet = f"{line[:start]}{redacted}{line[end:]}".strip()
    if len(snippet) > 200:
        snippet = f"{snippet[:200]}..."
    return snippet


def scan_file(
    file_path: str,
    patterns: list[SecretPattern],
    allowlist: list[re.Pattern[str]],
    max_matches_per_file: int,
) -> list[Finding]:
    findings: list[Finding] = []
    try:
        with open(file_path, "r", encoding="utf-8", errors="replace") as handle:
            for line_number, line in enumerate(handle, start=1):
                if is_allowlisted(line, allowlist):
                    continue
                for pattern in patterns:
                    match = pattern.regex.search(line)
                    if not match:
                        continue
                    if is_allowlisted(match.group(0), allowlist):
                        continue
                    findings.append(
                        Finding(
                            file_path=file_path,
                            line_number=line_number,
                            rule_name=pattern.name,
                            snippet=build_snippet(line, match),
                        )
                    )
                    if len(findings) >= max_matches_per_file:
                        return findings
                if len(findings) >= max_matches_per_file:
                    return findings
    except OSError as exc:
        print(f"specstory-guard: failed to read {file_path}: {exc}", file=sys.stderr)
    return findings


def format_findings(findings: list[Finding], output_format: str) -> str:
    if output_format == "markdown":
        lines = ["specstory-guard: potential secrets detected:"]
        for finding in findings:
            rel_path = os.path.relpath(finding.file_path, os.getcwd())
            lines.append(
                f"- `{rel_path}:{finding.line_number}` ({finding.rule_name}) {finding.snippet}"
            )
        return "\n".join(lines)
    lines = ["specstory-guard: potential secrets detected:"]
    for finding in findings:
        rel_path = os.path.relpath(finding.file_path, os.getcwd())
        lines.append(
            f"{rel_path}:{finding.line_number}: {finding.rule_name}: {finding.snippet}"
        )
    return "\n".join(lines)


def main() -> int:
    args = parse_args()
    root = os.path.abspath(args.root)
    history_dir = resolve_history_dir(root, args.history_dir)

    if not os.path.isdir(history_dir):
        return 0

    allowlist = ALLOWLIST + load_user_allowlist()
    findings: list[Finding] = []

    for file_path in iter_history_files(history_dir):
        findings.extend(
            scan_file(
                file_path=file_path,
                patterns=PATTERNS,
                allowlist=allowlist,
                max_matches_per_file=args.max_matches_per_file,
            )
        )
        if len(findings) >= args.max_matches:
            break

    if not findings:
        return 0

    print(format_findings(findings, args.format), file=sys.stderr)
    return 1


if __name__ == "__main__":
    raise SystemExit(main())

from __future__ import annotations

import argparse
import os
import shutil
import stat
import subprocess
import sys


HOOK_MARKER = "specstory-guard"


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="Install specstory-guard git hooks.")
    subparsers = parser.add_subparsers(dest="command")

    install = subparsers.add_parser("install", help="Install the pre-commit hook")
    install.add_argument("--force", action="store_true", help="Overwrite existing hook")

    subparsers.add_parser("uninstall", help="Remove the pre-commit hook")

    args = parser.parse_args()
    if args.command is None:
        args.command = "install"
        args.force = False
    return args


def repo_root() -> str:
    try:
        result = subprocess.run(
            ["git", "rev-parse", "--show-toplevel"],
            check=True,
            capture_output=True,
            text=True,
        )
        return result.stdout.strip()
    except (subprocess.SubprocessError, FileNotFoundError):
        return os.getcwd()


def skill_root() -> str:
    return os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))


def hook_source_path(hook_name: str) -> str:
    return os.path.join(skill_root(), "hooks", hook_name)


def hook_dest_path(root: str, hook_name: str) -> str:
    return os.path.join(root, ".git", "hooks", hook_name)


def ensure_executable(path: str) -> None:
    current = os.stat(path).st_mode
    os.chmod(path, current | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)


def is_guard_hook(path: str) -> bool:
    try:
        with open(path, "r", encoding="utf-8", errors="replace") as handle:
            return HOOK_MARKER in handle.read()
    except OSError:
        return False


def install_hook(root: str, hook_name: str, force: bool) -> int:
    source = hook_source_path(hook_name)
    destination = hook_dest_path(root, hook_name)

    if not os.path.isfile(source):
        print(f"specstory-guard: missing hook template at {source}", file=sys.stderr)
        return 1

    os.makedirs(os.path.dirname(destination), exist_ok=True)

    if os.path.exists(destination) and not force and not is_guard_hook(destination):
        print(
            "specstory-guard: existing hook found; use --force to overwrite",
            file=sys.stderr,
        )
        return 1

    shutil.copyfile(source, destination)
    ensure_executable(destination)
    print(f"specstory-guard: installed {hook_name} hook")
    return 0


def uninstall_hook(root: str, hook_name: str) -> int:
    destination = hook_dest_path(root, hook_name)
    if not os.path.exists(destination):
        print("specstory-guard: hook not installed")
        return 0

    if not is_guard_hook(destination):
        print(
            "specstory-guard: hook not managed by specstory-guard; refusing to remove",
            file=sys.stderr,
        )
        return 1

    os.remove(destination)
    print(f"specstory-guard: removed {hook_name} hook")
    return 0


def main() -> int:
    args = parse_args()
    root = repo_root()
    hook_name = "pre-commit"

    if args.command == "install":
        return install_hook(root, hook_name, args.force)
    if args.command == "uninstall":
        return uninstall_hook(root, hook_name)

    print("specstory-guard: unknown command", file=sys.stderr)
    return 1


if __name__ == "__main__":
    raise SystemExit(main())