# The outline of this workflow is something that the GitHub Security team warns against
# here: https://securitylab.github.com/research/github-actions-preventing-pwn-requests. But
# due to this workflow only running a git diff check and not building or publishing anything,
# there is no harm in checking out the PR HEAD code.
#
# All the code checked out in this workflow should be considered untrusted. This workflow must
# never call any makefiles or scripts. It must never be changed to run any code from the checkout.
on:
  pull_request_target:
    # Runs on PRs to master and all release branches
    # By default it triggers on opened, synchronize, or reopened PRs
    branches:
      - master
      - release/*

jobs:
  # checks that a .changelog entry is present for a PR
  changelog-check:
    # If there  a `pr/no-changelog` label we ignore this check
    if: "!${{ contains(github.event.pull_request.label.*.name, 'pr/no-changelog')}}"
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0 # by default the checkout action doesn't checkout all branches
      - name: Check for changelog entry in diff
        run: |
          # check if there is a diff in the .changelog directory
          changelog_files=$(git --no-pager diff --name-only HEAD "$(git merge-base HEAD "origin/${{ github.event.pull_request.base.ref }}")" -- .changelog/)

          # If we do not find a file in .changelog/, we post a comment to the PR
          if [ -z "$changelog_files" ]; then
            # post PR comment to GitHub when no .changelog entry was found on PR
            echo "changelog-check: Did not find a .changelog entry, posting a reminder in the PR"
            github_message="🤔 Double check that this PR does not require a changelog entry in the .changelog directory. [Reference](https://github.com/hashicorp/consul/pull/8387)"
            curl -f -s -H "Authorization: token ${{ secrets.PR_COMMENT_TOKEN }}" \
                -X POST \
                -d "{ \"body\": \"${github_message}\"}" \
                "https://api.github.com/repos/${GITHUB_REPOSITORY}/issues/${{ github.event.pull_request.number }}/comments"
          else
            echo "changelog-check: Found .changelog entry in PR!"
          fi

  # checks that a 'type/docs-cherrypick' label is attached to PRs with website/ changes
  website-check:
    # If there's a `type/docs-cherrypick` label we ignore this check
    if: "!${{ contains(github.event.pull_request.label.*.name, 'type/docs-cherrypick')}}"
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0 # by default the checkout action doesn't checkout all branches
      - name: Check for website/ dir change in diff
        run: |
          # check if there is a diff in the website/ directory
          website_files=$(git --no-pager diff --name-only HEAD "$(git merge-base HEAD "origin/${{ github.event.pull_request.base.ref }}")" -- website/)

          # If we find changed files in the website/ directory, we post a comment to the PR
          if [ -n "$website_files" ]; then
            # post PR comment to GitHub to check if a 'type/docs-cherrypick' label needs to be applied to the PR
            echo "website-check: Did not find a 'type/docs-cherrypick' label, posting a reminder in the PR"
            github_message="🤔 This PR has changes in the `website/` directory but does not have a `type/docs-cherrypick` label. If the changes are for the next version, this can be ignored. If they are updates to current docs, attach the label to auto cherrypick to the `stable-website` branch after merging."
            curl -f -s -H "Authorization: token ${{ secrets.PR_COMMENT_TOKEN }}" \
                -X POST \
                -d "{ \"body\": \"${github_message}\"}" \
                "https://api.github.com/repos/${GITHUB_REPOSITORY}/issues/${{ github.event.pull_request.number }}/comments"
          fi