name: CI

on:
  push:
    branches:
      - main
      - release-*
  pull_request: {}
  workflow_dispatch: {}

env:
  # Common versions
  GOLANGCI_VERSION: 'v1.49.0'
  KUBERNETES_VERSION: '1.24.x'
  DOCKER_BUILDX_VERSION: 'v0.4.2'

  # Common users. We can't run a step 'if secrets.GHCR_USERNAME != ""' but we can run
  # a step 'if env.GHCR_USERNAME' != ""', so we copy these to succinctly test whether
  # credentials have been provided before trying to run steps that need them.
  GHCR_USERNAME: ${{ secrets.GHCR_USERNAME }}

  # Sonar
  SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

jobs:
  detect-noop:
    runs-on: ubuntu-18.04
    outputs:
      noop: ${{ steps.noop.outputs.should_skip }}
    steps:
      - name: Detect No-op Changes
        id: noop
        uses: fkirc/skip-duplicate-actions@v4.0.0
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          paths_ignore: '["**.md", "**.png", "**.jpg"]'
          do_not_skip: '["workflow_dispatch", "schedule", "push"]'
          concurrent_skipping: false

  lint:
    runs-on: ubuntu-18.04
    needs: detect-noop
    if: needs.detect-noop.outputs.noop != 'true'

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup Go
        uses: actions/setup-go@v3
        with:
          go-version-file: "go.mod"

      - name: Find the Go Cache
        id: go
        run: |
          echo "::set-output name=build-cache::$(go env GOCACHE)"
          echo "::set-output name=mod-cache::$(go env GOMODCACHE)"

      - name: Cache the Go Build Cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.build-cache }}
          key: ${{ runner.os }}-build-lint-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-build-lint-${{ github.sha }}-

      - name: Cache Go Dependencies
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.mod-cache }}
          key: ${{ runner.os }}-pkg-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-pkg-${{ github.sha }}-

      # This action uses its own setup-go, which always seems to use the latest
      # stable version of Go. We could run 'make lint' to ensure our desired Go
      # version, but we prefer this action because it leaves 'annotations' (i.e.
      # it comments on PRs to point out linter violations).
      - name: Lint
        uses: golangci/golangci-lint-action@v3.2.0
        with:
          version: ${{ env.GOLANGCI_VERSION }}
          skip-pkg-cache: true
          skip-build-cache: true
          skip-go-installation: true

  check-diff:
    runs-on: ubuntu-18.04
    needs: detect-noop
    if: needs.detect-noop.outputs.noop != 'true'

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup Go
        uses: actions/setup-go@v3
        with:
          go-version-file: "go.mod"

      - name: Find the Go Cache
        id: go
        run: |
          echo "::set-output name=build-cache::$(go env GOCACHE)"
          echo "::set-output name=mod-cache::$(go env GOMODCACHE)"

      - name: Cache the Go Build Cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.build-cache }}
          key: ${{ runner.os }}-build-check-diff-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-build-check-diff-${{ github.sha }}-

      - name: Cache Go Dependencies
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.mod-cache }}
          key: ${{ runner.os }}-pkg-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-pkg-${{ github.sha }}-

      # Check DIff also runs Reviewable which needs golangci-lint installed
      - name: Check Diff
        run: |
          wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s ${{ env.GOLANGCI_VERSION }}
          export PATH=$PATH:./bin
          make check-diff

  unit-tests:
    runs-on: ubuntu-18.04
    needs: detect-noop
    if: needs.detect-noop.outputs.noop != 'true'

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Fetch History
        run: git fetch --prune --unshallow

      - name: Setup Go
        uses: actions/setup-go@v3
        with:
          go-version-file: "go.mod"

      - name: Find the Go Cache
        id: go
        run: |
          echo "::set-output name=build-cache::$(go env GOCACHE)"
          echo "::set-output name=mod-cache::$(go env GOMODCACHE)"

      - name: Cache the Go Build Cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.build-cache }}
          key: ${{ runner.os }}-build-unit-tests-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-build-unit-tests-${{ github.sha }}-

      - name: Cache Go Dependencies
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.mod-cache }}
          key: ${{ runner.os }}-pkg-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-pkg-${{ github.sha }}-

      - name: Add setup-envtest
        run: |
          go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
          setup-envtest use ${{env.KUBERNETES_VERSION}} -p env --os $(go env GOOS) --arch $(go env GOARCH)

      - name: Cache envtest binaries
        uses: actions/cache@v3
        with:
          path: /home/runner/.local/share/kubebuilder-envtest/
          key: ${{ runner.os }}-kubebuilder-${{env.KUBERNETES_VERSION}}
          restore-keys: ${{ runner.os }}-kubebuilder-

      - name: Run Unit Tests
        run: |
          export KUBEBUILDER_ATTACH_CONTROL_PLANE_OUTPUT=true
          source <(setup-envtest use ${{env.KUBERNETES_VERSION}} -p env --os $(go env GOOS) --arch $(go env GOARCH))
          make test


  publish-artifacts:
    runs-on: ubuntu-18.04
    needs: detect-noop
    if: needs.detect-noop.outputs.noop != 'true'

    permissions:
      id-token: write
      contents: read

    steps:
      - name: Setup QEMU
        uses: docker/setup-qemu-action@v2
        with:
          platforms: all

      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          version: ${{ env.DOCKER_BUILDX_VERSION }}
          install: true

      - name: Checkout
        uses: actions/checkout@v3

      - name: Fetch History
        run: git fetch --prune --unshallow

      - name: Setup Go
        uses: actions/setup-go@v3
        with:
          go-version-file: "go.mod"

      - name: Find the Go Cache
        id: go
        run: |
          echo "::set-output name=build-cache::$(go env GOCACHE)"
          echo "::set-output name=mod-cache::$(go env GOMODCACHE)"

      - name: Cache the Go Build Cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.build-cache }}
          key: ${{ runner.os }}-build-publish-artifacts-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-build-publish-artifacts-${{ github.sha }}-

      - name: Cache Go Dependencies
        uses: actions/cache@v3
        with:
          path: ${{ steps.go.outputs.mod-cache }}
          key: ${{ runner.os }}-pkg-${{ github.sha }}-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-pkg-${{ github.sha }}-

      - name: Login to Docker
        uses: docker/login-action@v2
        if: env.GHCR_USERNAME != ''
        with:
          registry: ghcr.io
          username: ${{ secrets.GHCR_USERNAME }}
          password: ${{ secrets.GHCR_TOKEN }}

      - name: Build & Publish Artifacts
        if: env.GHCR_USERNAME != ''
        env:
          BUILD_ARGS: "--push --platform linux/amd64,linux/arm64"
        run: make docker.build

      - name: Get docker image tag
        if: env.GHCR_USERNAME != ''
        id: image_version
        run: echo "::set-output name=image::$(make docker.image)"

      - name: Run Trivy vulnerability scanner
        if: env.GHCR_USERNAME != ''
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: '${{ steps.image_version.outputs.image }}'
          format: 'table'
          exit-code: '1'
          ignore-unfixed: true
          vuln-type: 'os,library'
          severity: 'CRITICAL,HIGH'

      - name: Promote Artifacts to main release channel
        if: github.ref == 'refs/heads/main' && env.GHCR_USERNAME != ''
        run: make docker.promote
        env:
          RELEASE_TAG: main

      - name: Set up crane
        if: github.ref == 'refs/heads/main' && env.GHCR_USERNAME != ''
        run: go install github.com/google/go-containerregistry/cmd/crane@v0.8.0

      - name: Install cosign
        if: github.ref == 'refs/heads/main' && env.GHCR_USERNAME != ''
        uses: sigstore/cosign-installer@v2.6.0

      - name: Sign Artifacts to main release channel
        if: github.ref == 'refs/heads/main' && env.GHCR_USERNAME != ''
        run: make docker.sign
        env:
          RELEASE_TAG: main
          COSIGN_EXPERIMENTAL: true