name: Helm

on:
  push:
    branches:
      - main
      - release-*
    paths:
      - 'deploy/charts/**'
      - 'deploy/crds/**'
  pull_request:
    paths:
      - 'deploy/charts/**'
      - 'deploy/crds/**'
  workflow_dispatch: {}

permissions:
  contents: read

jobs:
  lint-and-test:
    runs-on: ubuntu-latest
    steps:
      - uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
        with:
          egress-policy: audit
      - name: Checkout
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 0

      - name: Generate chart
        run: |
          make helm.generate
      - name: Set up Helm
        uses: azure/setup-helm@5119fcb9089d432beecbf79bb2c7915207344b78 # v3.5
        with:
          version: v3.14.2 # remember to also update for the second job (release)

      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
        with:
          python-version: 3.12

      - name: Set up chart-testing
        uses: helm/chart-testing-action@0d28d3144d3a25ea2cc349d6e59901c4ff469b3b # v2.7.0

      - name: Run chart-testing (list-changed)
        id: list-changed
        run: |
          changed=$(ct list-changed --config=.github/ci/ct.yaml)
          if [[ -n "$changed" ]]; then
            echo "changed=true" >> $GITHUB_OUTPUT
          fi
      - name: Install chart unittest
        run: |
          helm env
          helm plugin install https://github.com/helm-unittest/helm-unittest
      - name: Run chart-testing (lint)
        run: ct lint --config=.github/ci/ct.yaml

      - name: Create kind cluster
        uses: helm/kind-action@a1b0e391336a6ee6713a0583f8c6240d70863de3 # v1.12.0
        if: steps.list-changed.outputs.changed == 'true'

      - name: Run chart-testing (install)
        run: ct install --config=.github/ci/ct.yaml --charts deploy/charts/external-secrets
        if: steps.list-changed.outputs.changed == 'true'

      - name: Run unitests
        if: steps.list-changed.outputs.changed == 'true'
        run: make helm.test
  release:
    if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/heads/release-')
    permissions:
      contents: write  # for helm/chart-releaser-action to push chart release and create a release
      packages: write  # to push OCI chart package to GitHub Registry
      id-token: write  # gives the action the ability to mint the OIDC token necessary to request a Sigstore signing certificate
      attestations: write # this permission is necessary to persist the attestation
    runs-on: ubuntu-latest
    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 0

      - name: Configure Git
        run: |
          git config user.name "$GITHUB_ACTOR"
          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"

      - name: Set up Helm
        uses: azure/setup-helm@f382f75448129b3be48f8121b9857be18d815a82 # v3.4
        with:
          version: v3.17.3

      - name: Generate chart
        run: make helm.generate

      - name: Import GPG key
        run: |
          echo "${{ secrets.GPG_PRIVATE_KEY }}" | gpg --dearmor --output keyring.gpg
          echo -n "${{ secrets.GPG_PASSPHRASE }}" > passphrase-file.txt

      - name: Run chart-releaser
        uses: helm/chart-releaser-action@cae68fefc6b5f367a0275617c9f83181ba54714f # v1.7.0
        env:
          CR_KEY: external-secrets <external-secrets@external-secrets.io>
          CR_KEYRING: keyring.gpg
          CR_PASSPHRASE_FILE: passphrase-file.txt
          CR_SIGN: true
          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
          CR_RELEASE_NAME_TEMPLATE: "helm-chart-{{ .Version }}"
        with:
          charts_dir: deploy/charts
          skip_existing: true
          charts_repo_url: https://charts.external-secrets.io

      - name: Set up Helm
        uses: azure/setup-helm@5119fcb9089d432beecbf79bb2c7915207344b78 # v3.5
        with:
          version: v3.17.3 # remember to also update for the first job (lint-and-test)

      - name: Login to GHCR
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install cosign
        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3.9.1
        with:
          cosign-release: 'v2.4.1'

      - name: Push chart to GHCR
        id: push_chart
        run: |
          shopt -s nullglob
          # helm push fails when registry path contains Uppercase letters
          chart_registry="ghcr.io/${GITHUB_REPOSITORY_OWNER}/charts"
          for pkg in .cr-release-packages/*.tgz; do
            if [ -z "${pkg:-}" ]; then
              break
            fi
            chart_name=$(helm show chart "${pkg}" | yq .name)
            chart_version=$(helm show chart "${pkg}" | yq .version)
            if helm show chart oci://${chart_registry}/${chart_name} --version ${chart_version} > /dev/null 2>&1; then
              echo "Chart oci://${chart_name}:${chart_version} already exists in repository - skipping..."
              echo "push_status=skipped" >> "$GITHUB_OUTPUT"
              continue
            fi

            helm_push_output=$(helm push "${pkg}" "oci://${chart_registry}" 2>&1)
            digest=$(echo "$helm_push_output" | grep -o 'sha256:[a-z0-9]*')
            echo "$helm_push_output"

            artifact_digest_uri="${chart_registry}/${chart_name}@${digest}"
            cosign sign --yes "$artifact_digest_uri"
            cosign verify "$artifact_digest_uri" \
                --certificate-identity-regexp "https://github.com/$GITHUB_REPOSITORY/*" \
                --certificate-oidc-issuer https://token.actions.githubusercontent.com

            echo "digest=${digest}" >> "$GITHUB_OUTPUT"
            echo "push_status=pushed" >> "$GITHUB_OUTPUT"
            echo "chart_name=${chart_name}" >> "$GITHUB_OUTPUT"
            echo "registry=${chart_registry}" >> "$GITHUB_OUTPUT"
          done

      - name: Generate provenance attestation and push to OCI registry
        if: steps.push_chart.outputs.push_status == 'pushed'
        uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2.4.0
        with:
          push-to-registry: true
          subject-name: ${{ steps.push_chart.outputs.registry }}/${{ steps.push_chart.outputs.chart_name }}
          subject-digest: ${{ steps.push_chart.outputs.digest }}