name: Update LavaMoat policies

on:
  issue_comment:
    types: created

jobs:
  is-fork-pull-request:
    name: Determine whether this issue comment was on a pull request from a fork
    if: ${{ github.event.issue.pull_request && startsWith(github.event.comment.body, '@metamaskbot update-policies') }}
    runs-on: ubuntu-latest
    outputs:
      IS_FORK: ${{ steps.is-fork.outputs.IS_FORK }}
    steps:
      - uses: actions/checkout@v3
      - name: Determine whether this PR is from a fork
        id: is-fork
        run: echo "IS_FORK=$(gh pr view --json isCrossRepository --jq '.isCrossRepository' "${PR_NUMBER}" )" >> "$GITHUB_OUTPUT"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}

  react-to-comment:
    name: React to the comment
    runs-on: ubuntu-latest
    needs: is-fork-pull-request
    # Early exit if this is a fork, since later steps are skipped for forks
    if: ${{ needs.is-fork-pull-request.outputs.IS_FORK == 'false' }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: React to the comment
        run: |
          gh api \
            --method POST \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            "/repos/${REPO}/issues/comments/${COMMENT_ID}/reactions" \
            -f content='+1'
        env:
          COMMENT_ID: ${{ github.event.comment.id }}
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          REPO: ${{ github.repository }}

  prepare:
    name: Prepare dependencies
    runs-on: ubuntu-latest
    needs: is-fork-pull-request
    # Early exit if this is a fork, since later steps are skipped for forks
    if: ${{ needs.is-fork-pull-request.outputs.IS_FORK == 'false' }}
    outputs:
      COMMIT_SHA: ${{ steps.commit-sha.outputs.COMMIT_SHA }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: Checkout pull request
        run: gh pr checkout "${PR_NUMBER}"
        env:
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
      - name: Use Node.js
        uses: actions/setup-node@v3
        with:
          node-version-file: '.nvmrc'
          cache: 'yarn'
      - name: Install Yarn dependencies
        run: yarn --immutable
      - name: Get commit SHA
        id: commit-sha
        run: echo "COMMIT_SHA=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"

  update-lavamoat-build-policy:
    name: Update LavaMoat build policy
    runs-on: ubuntu-latest
    needs:
      - prepare
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: Checkout pull request
        run: gh pr checkout "${PR_NUMBER}"
        env:
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version-file: '.nvmrc'
          cache: 'yarn'
      - name: Install dependencies from cache
        run: yarn --immutable --immutable-cache
      - name: Update LavaMoat build policy
        run: yarn lavamoat:build:auto
      - name: Cache build policy
        uses: actions/cache/save@v3
        with:
          path: lavamoat/build-system
          key: cache-build-${{ needs.prepare.outputs.COMMIT_SHA }}

  update-lavamoat-webapp-policy:
    strategy:
      matrix:
        # Ensure this is synchronized with the list below in the "commit-updated-policies" job
        # and with the build type list in `builds.yml`
        build-type: [main, beta, flask, mmi, desktop]
    name: Update LavaMoat ${{ matrix.build-type }} application policy
    runs-on: ubuntu-latest
    needs:
      - prepare
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: Checkout pull request
        run: gh pr checkout "${PR_NUMBER}"
        env:
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version-file: '.nvmrc'
          cache: 'yarn'
      - name: Install dependencies from cache
        run: yarn --immutable --immutable-cache
      - name: Update LavaMoat ${{ matrix.build-type }} policy
        run: yarn lavamoat:webapp:auto:ci '--build-types=${{ matrix.build-type }}'
        env:
          INFURA_PROJECT_ID: 00000000000
      - name: Cache ${{ matrix.build-type }} application policy
        uses: actions/cache/save@v3
        with:
          path: lavamoat/browserify/${{ matrix.build-type }}
          key: cache-${{ matrix.build-type }}-${{ needs.prepare.outputs.COMMIT_SHA }}

  commit-updated-policies:
    name: Commit the updated LavaMoat policies
    runs-on: ubuntu-latest
    needs:
      - prepare
      - is-fork-pull-request
      - update-lavamoat-build-policy
      - update-lavamoat-webapp-policy
    # Ensure forks don't get access to the LavaMoat update token
    if: ${{ needs.is-fork-pull-request.outputs.IS_FORK == 'false' }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          # Use PAT to ensure that the commit later can trigger status check workflows
          token: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
      - name: Checkout pull request
        run: gh pr checkout "${PR_NUMBER}"
        env:
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
      - name: Get commit SHA
        id: commit-sha
        run: echo "COMMIT_SHA=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
      - name: Restore build policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/build-system
          key: cache-build-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      # One restore step per build type: [main, beta, flask, mmi, desktop]
      # Ensure this is synchronized with the list above in the "update-lavamoat-webapp-policy" job
      # and with the build type list in `builds.yml`
      - name: Restore main application policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/browserify/main
          key: cache-main-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      - name: Restore beta application policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/browserify/beta
          key: cache-beta-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      - name: Restore flask application policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/browserify/flask
          key: cache-flask-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      - name: Restore mmi application policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/browserify/mmi
          key: cache-mmi-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      - name: Restore desktop application policy
        uses: actions/cache/restore@v3
        with:
          path: lavamoat/browserify/desktop
          key: cache-desktop-${{ needs.prepare.outputs.COMMIT_SHA }}
          fail-on-cache-miss: true
      - name: Check whether there are policy changes
        id: policy-changes
        run: |
          if git diff --exit-code
          then
            echo "HAS_CHANGES=false" >> "$GITHUB_OUTPUT"
          else
            echo "HAS_CHANGES=true" >> "$GITHUB_OUTPUT"
          fi
      - name: Commit the updated policies
        if: steps.policy-changes.outputs.HAS_CHANGES == 'true'
        run: |
          git config --global user.name 'MetaMask Bot'
          git config --global user.email 'metamaskbot@users.noreply.github.com'
          git commit -am "Update LavaMoat policies"
          git push
      - name: Post comment
        run: |
          if [[ $HAS_CHANGES == 'true' ]]
          then
            gh pr comment "${PR_NUMBER}" --body 'Policies updated'
          else
            gh pr comment "${PR_NUMBER}" --body 'No policy changes'
          fi
        env:
          HAS_CHANGES: ${{ steps.policy-changes.outputs.HAS_CHANGES }}
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}

  check-status:
    name: Check whether the policy update succeeded
    runs-on: ubuntu-latest
    needs:
      - commit-updated-policies
    outputs:
      PASSED: ${{ steps.set-output.outputs.PASSED }}
    steps:
      - name: Set PASSED output
        id: set-output
        run: echo "PASSED=true" >> "$GITHUB_OUTPUT"

  failure-comment:
    name: Comment about the policy update failure
    if: ${{ always() && needs.is-fork-pull-request.outputs.IS_FORK == 'false' }}
    runs-on: ubuntu-latest
    needs:
      - is-fork-pull-request
      - check-status
    steps:
      - uses: actions/checkout@v3
        with:
          token: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
      - name: Post comment if the update failed
        run: |
          passed="${{ needs.check-status.outputs.PASSED }}"
          if [[ $passed != "true" ]]; then
            gh pr comment "${PR_NUMBER}" --body "Policy update failed. You can [review the logs or retry the policy update here](${ACTION_RUN_URL})"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.LAVAMOAT_UPDATE_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
          ACTION_RUN_URL: "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"