comment-changed-filenames.yml

name: Flag changed filenames

# **What it does**: Adds or removes a comment if a PR renames or removes a file.
# **Why we have it**: Highlights when we need redirects covering certain file paths.
# **Who does it impact**: PCX team, other Cloudflare contributors

on:
  pull_request:
    branches:
      - production

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:

  flag_changed_filenames:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Get Renamed or Removed Files from Pull Request
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          files=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/files" | \
            jq -r '.[] | select(.status=="renamed" or .status=="removed") | select (.filename | contains("_partials") | not) | select(.filename | endswith(".md")) | if .status == "renamed" then .previous_filename else .filename end' | \
            sed -e 's|^content||' -e 's|/_index\.md$|/|' -e 's|/index\.md$|/|' -e 's|\.md$|/|')
          # Use random delimiter for security reasons
          delimiter="$(openssl rand -hex 8)"
          echo "CHANGED_FILES<<${delimiter}" >> "$GITHUB_ENV"
          echo "${files}" >> "$GITHUB_ENV"
          echo "${delimiter}" >> "$GITHUB_ENV"

      - name: Comment or Update Comment on PR based on changed files
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # If there are no changed files
          if [ -z "$CHANGED_FILES" ]; then
            # Fetch the ID of the existing comment, if it exists
            existing_comment_id=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
              -H "Accept: application/vnd.github.v3+json" \
              "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments" | \
              jq '.[] | select(.user.id == 41898282) | select(.body | contains("This PR changes current filenames or deletes current files")) | .id')

            # If the comment exists, delete it
            if [ ! -z "$existing_comment_id" ]; then
              curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
                -H "Accept: application/vnd.github.v3+json" \
                -X DELETE \
                "https://api.github.com/repos/${{ github.repository }}/issues/comments/$existing_comment_id"
            fi
          else
            # Construct the comment body for changed files
            comment_body="This PR changes current filenames or deletes current files. Make sure you have [redirects](https://developers.cloudflare.com/pages/configuration/redirects/) set up to cover the following paths:"
            for path in $CHANGED_FILES; do
              clean_path=$(echo $path | sed 's/"//g')  # Remove quotation marks
              comment_body="$comment_body
            - [ ] \`$clean_path\`"
            done

            # Check if a comment already exists
            existing_comment_id=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
              -H "Accept: application/vnd.github.v3+json" \
              "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments" | \
              jq '.[] | select(.user.id == 41898282) | select(.body | contains("This PR changes current filenames or deletes current files")) | .id')

            comment_payload=$(echo '{}' | jq --arg body "$comment_body" '.body = $body')

            # If a comment exists, update it. Otherwise, post a new comment.
            if [ ! -z "$existing_comment_id" ]; then
              curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
                -H "Accept: application/vnd.github.v3+json" \
                -X PATCH -d "$comment_payload" \
                "https://api.github.com/repos/${{ github.repository }}/issues/comments/$existing_comment_id"
            else
              curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
                -H "Accept: application/vnd.github.v3+json" \
                -X POST -d "$comment_payload" \
                "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments"
            fi
          fi