# Security scanning — runs on every PR, on push to main, and weekly.
#
# Complements the CodeRabbit + Greptile app reviews (which fire on PR creation)
# with deterministic, gating checks:
#   • gitleaks   — secret scanning. HARD FAIL: a leaked credential blocks merge.
#   • CodeQL     — Python + JS/TS SAST. Results land in the Security tab.
#   • bandit     — Python SAST (SARIF → Security tab). Reporting, non-gating.
#   • pip-audit  — Python dependency advisories. Reporting, non-gating.
#   • bun audit  — frontend dependency advisories. Reporting, non-gating.
#
# Only the secret scan gates the PR. Dependency advisories and bandit findings
# are surfaced as signal (Security tab / job log) rather than blocking every PR
# on a transitive upstream advisory — consistent with the "no ceremony,
# continuous-to-main" cadence.
name: Security

on:
  pull_request:
    branches: [main]
  push:
    branches: [main]
  schedule:
    # Mondays 06:00 UTC — catch advisories disclosed since the last PR.
    - cron: "0 6 * * 1"
  workflow_dispatch:

env:
  # Match ci.yml: run JS actions on Node 24 (GH removes Node 20 in Sep 2026).
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

# Least privilege by default; jobs that upload SARIF opt into security-events.
permissions:
  contents: read

concurrency:
  group: security-${{ github.ref }}
  cancel-in-progress: true

jobs:
  # ── Secret scanning (gating) ─────────────────────────────────────────────
  # Full-history scan on push to main; PR-diff scan on pull_request (faster,
  # and the action picks the right mode from the event automatically).
  secrets:
    name: Secret scan (gitleaks)
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
        with:
          # gitleaks needs full history to scan all commits on push events.
          fetch-depth: 0
          # No authed git needed after clone; don't persist GITHUB_TOKEN.
          persist-credentials: false
      - name: gitleaks
        uses: gitleaks/gitleaks-action@v2
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # GITLEAKS_LICENSE is only required for GitHub *organizations*; this is
          # a personal public repo, so the action runs free without it.

  # ── CodeQL SAST (Python + JS/TS) ─────────────────────────────────────────
  codeql:
    name: CodeQL (${{ matrix.language }})
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      security-events: write
    strategy:
      fail-fast: false
      matrix:
        language: [python, javascript-typescript]
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Initialize CodeQL
        uses: github/codeql-action/init@v3
        with:
          languages: ${{ matrix.language }}
          # Both targets are interpreted — no compiled build step needed.
          build-mode: none
          queries: security-and-quality

      - name: Analyze
        uses: github/codeql-action/analyze@v3
        with:
          category: "/language:${{ matrix.language }}"

  # ── Python SAST (bandit → SARIF) ─────────────────────────────────────────
  bandit:
    name: Python SAST (bandit)
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      security-events: write
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Setup Python 3.11
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      # -ll: report MEDIUM+ severity only. -ii: MEDIUM+ confidence only.
      # Keeps the SARIF focused on findings worth a human look. The scan step
      # is allowed to "fail" (findings present) without failing the job; the
      # SARIF upload still runs so results reach the Security tab.
      #
      # NOTE: the `sarif` output format lives in the `bandit[sarif]` extra
      # (pulls in sarif-om + jschema-to-python). Plain `bandit` rejects
      # `-f sarif`, so install via the extra spec.
      - name: Run bandit
        continue-on-error: true
        run: |
          pipx run --spec 'bandit[sarif]' bandit -r backend/ -ll -ii -f sarif -o bandit.sarif

      # continue-on-error: this job is reporting-only. If bandit can't write a
      # SARIF for any reason (no findings dir, pipx hiccup), don't fail the job.
      - name: Upload bandit SARIF
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        continue-on-error: true
        with:
          sarif_file: bandit.sarif
          category: bandit

  # ── Dependency advisories (reporting) ────────────────────────────────────
  dependencies:
    name: Dependency audit
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Install uv
        uses: astral-sh/setup-uv@v3
        with:
          enable-cache: true
          cache-dependency-glob: "uv.lock"

      - name: Setup Python 3.11
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      # Audit the resolved Python environment. Non-gating: a transitive
      # advisory with no fix available should not wall off every PR.
      - name: pip-audit (Python)
        continue-on-error: true
        run: |
          uv sync
          uv run --with pip-audit pip-audit

      # Pin a floor: `bun audit` was added in bun 1.2.x, so guarantee it exists.
      - name: Setup Bun
        uses: oven-sh/setup-bun@v1
        with:
          bun-version: "1.2"

      # `bun audit` reports advisories against the frontend lockfile. Non-gating
      # for the same reason; also tolerant of older bun without the subcommand.
      - name: bun audit (frontend)
        continue-on-error: true
        working-directory: frontend
        run: |
          bun install --frozen-lockfile
          bun audit