name: 'Tools: Check Changelog'

on:
  pull_request:
    types:
      - 'opened'
      - 'synchronize'
      - 'reopened'
      - 'labeled'
      - 'unlabeled'
    branches:
      - 'master'
      - 'v5.*'

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

permissions: {}

jobs:
  test-changelog-attribution:
    if: github.repository == 'prowler-cloud/prowler'
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read

    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: block
          allowed-endpoints: >
            api.github.com:443
            github.com:443
            objects.githubusercontent.com:443
            release-assets.githubusercontent.com:443
            pypi.org:443
            files.pythonhosted.org:443

      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 1
          persist-credentials: false

      - name: Fetch PR base ref for tj-actions/changed-files
        env:
          BASE_REF: ${{ github.event.pull_request.base.ref }}
        run: git fetch --depth=1 origin "${BASE_REF}"

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@9426d40962ed5378910ee2e21d5f8c6fcbf2dd96 # v47.0.6
        with:
          files: |
            .github/scripts/changelog_attribution.py
            .github/workflows/pr-check-changelog.yml
            .github/workflows/compile-changelogs.yml
            .github/towncrier/template.md.jinja
            */towncrier.toml
            tests/github/**

      - name: Set up Python
        if: steps.changed-files.outputs.any_changed == 'true'
        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
        with:
          python-version: '3.12'

      - name: Test changelog attribution
        if: steps.changed-files.outputs.any_changed == 'true'
        run: |
          python3 -m pip install --user --disable-pip-version-check pytest==9.0.3 towncrier==25.8.0
          python3 -m pytest tests/github

  check-changelog:
    if: contains(github.event.pull_request.labels.*.name, 'no-changelog') == false
    runs-on: ubuntu-latest
    timeout-minutes: 15
    permissions:
      contents: read
      pull-requests: write
    env:
      MONITORED_FOLDERS: 'api ui prowler mcp_server'

    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: block
          allowed-endpoints: >
            api.github.com:443
            github.com:443

      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 1
          # zizmor: ignore[artipacked]
          persist-credentials: true # Required by tj-actions/changed-files to fetch PR branch

      - name: Fetch PR base ref for tj-actions/changed-files
        env:
          BASE_REF: ${{ github.event.pull_request.base.ref }}
        run: git fetch --depth=1 origin "${BASE_REF}"

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@9426d40962ed5378910ee2e21d5f8c6fcbf2dd96 # v47.0.6
        with:
          files: |
            api/**
            ui/**
            prowler/**
            mcp_server/**
            uv.lock
            pyproject.toml

      - name: Check for folder changes and changelog fragment presence
        id: check-folders
        run: |
          fragment_name_re='^[A-Za-z0-9][A-Za-z0-9._-]*\.(added|changed|deprecated|removed|fixed|security)(\.[0-9]+)?\.md$'
          manual_pr_link_re='(\[\(#[0-9]+\)\]|\[#[0-9]+\]\(|\(#[0-9]+\)|github\.com/[^[:space:]/]+/[^[:space:]/]+/(pull|issues)/[0-9]+)'
          folder_alt=$(echo "$MONITORED_FOLDERS" | tr ' ' '|')

          missing_fragments=""
          invalid_fragments=""
          linked_fragments=""
          handwritten_changelogs=""

          all_changed=$(echo "${STEPS_CHANGED_FILES_OUTPUTS_ALL_CHANGED_FILES}" | tr ' ' '\n')
          added_or_renamed=$(printf '%s\n%s' "${STEPS_CHANGED_FILES_OUTPUTS_ADDED_FILES}" "${STEPS_CHANGED_FILES_OUTPUTS_RENAMED_FILES}" | tr ' ' '\n')
          added_modified_or_renamed=$(printf '%s\n%s\n%s' "${STEPS_CHANGED_FILES_OUTPUTS_ADDED_FILES}" "${STEPS_CHANGED_FILES_OUTPUTS_MODIFIED_FILES}" "${STEPS_CHANGED_FILES_OUTPUTS_RENAMED_FILES}" | tr ' ' '\n')

          # Returns success if the folder has a valid fragment added, modified, or renamed.
          has_changelog_update() {
            local folder="$1"
            if echo "$added_modified_or_renamed" | grep "^${folder}/changelog.d/" | sed "s|^${folder}/changelog.d/||" | grep -qE "$fragment_name_re"; then
              return 0
            fi
            return 1
          }

          if [[ "${STEPS_CHANGED_FILES_OUTPUTS_ANY_CHANGED}" == "true" ]]; then
            # Check monitored folders
            for folder in $MONITORED_FOLDERS; do
              if echo "$all_changed" | grep -q "^${folder}/CHANGELOG.md$"; then
                echo "Direct CHANGELOG.md edits are not allowed for ${folder}/"
                handwritten_changelogs="${handwritten_changelogs}- \`${folder}/CHANGELOG.md\`"$'\n'
              fi

              changed_in_folder=$(echo "$all_changed" | grep "^${folder}/" | grep -v "^${folder}/CHANGELOG.md$" || true)

              if [ -n "$changed_in_folder" ]; then
                echo "Detected changes in ${folder}/"

                if ! has_changelog_update "$folder"; then
                  echo "No changelog fragment found for ${folder}/"
                  missing_fragments="${missing_fragments}- \`${folder}\`"$'\n'
                fi
              fi
            done

            # Check root-level dependency files (uv.lock, pyproject.toml)
            # These are associated with the prowler folder changelog
            root_deps_changed=$(echo "$all_changed" | grep -E "^(uv\.lock|pyproject\.toml)$" || true)
            if [ -n "$root_deps_changed" ]; then
              echo "Detected changes in root dependency files: $root_deps_changed"
              if ! has_changelog_update "prowler"; then
                # Only add if prowler wasn't already flagged
                if ! echo "$missing_fragments" | grep -q "prowler"; then
                  echo "No changelog fragment found for root dependency changes"
                  missing_fragments="${missing_fragments}- \`prowler\` (root dependency files changed)"$'\n'
                fi
              fi
            fi

            # Validate the filename of every fragment added by this PR
            added_fragments=$(echo "$added_or_renamed" | grep -E "^(${folder_alt})/changelog\.d/" || true)
            for fragment in $added_fragments; do
              name=$(basename "$fragment")
              if [ "$name" = ".gitkeep" ] || [ "$name" = "README.md" ]; then
                continue
              fi
              if ! echo "$name" | grep -qE "$fragment_name_re"; then
                echo "Invalid fragment filename: $fragment"
                invalid_fragments="${invalid_fragments}- \`${fragment}\`"$'\n'
              fi
            done

            # Lint fragment content: the PR link is attached automatically at
            # compile time, so a hand-written PR or issue link would be wrong
            touched_fragments=$(echo "$added_modified_or_renamed" | grep -E "^(${folder_alt})/changelog\.d/" || true)
            for fragment in $touched_fragments; do
              name=$(basename "$fragment")
              if [ "$name" = ".gitkeep" ] || [ "$name" = "README.md" ] || [ ! -f "$fragment" ]; then
                continue
              fi
              if grep -qE "$manual_pr_link_re" "$fragment"; then
                echo "Fragment contains a hand-written PR or issue link: $fragment"
                linked_fragments="${linked_fragments}- \`${fragment}\`"$'\n'
              fi
            done
          fi

          # Suggest a slug derived from the branch name for the bot comment
          suggested_slug=$(echo "$HEAD_REF" | tr '[:upper:]' '[:lower:]' | sed 's|.*/||; s/[^a-z0-9._-]/-/g; s/^[^a-z0-9]*//')
          if [ -z "$suggested_slug" ]; then
            suggested_slug="my-change"
          fi

          fragment_help="A changelog fragment is a small Markdown file named \`<slug>.<type>.md\` under \`<component>/changelog.d/\`, where \`<type>\` is one of \`added\`, \`changed\`, \`deprecated\`, \`removed\`, \`fixed\` or \`security\`. Its content is the changelog entry text, without the PR link (added automatically at release time) and without a trailing period. For example:

          \`\`\`
          echo 'Entry text describing the change' > <component>/changelog.d/${suggested_slug}.fixed.md
          \`\`\`

          If this PR does not need a changelog entry, add the \`no-changelog\` label instead."

          if [ -n "$missing_fragments" ] || [ -n "$invalid_fragments" ] || [ -n "$linked_fragments" ] || [ -n "$handwritten_changelogs" ]; then
            comment_body=""
            if [ -n "$missing_fragments" ]; then
              comment_body="⚠️ **Changes detected in the following folders without a changelog fragment:**"$'\n\n'"${missing_fragments}"$'\n'
            fi
            if [ -n "$invalid_fragments" ]; then
              comment_body="${comment_body}⚠️ **Changelog fragment filenames that do not follow the naming convention:**"$'\n\n'"${invalid_fragments}"$'\n'
            fi
            if [ -n "$linked_fragments" ]; then
              comment_body="${comment_body}⚠️ **Changelog fragments containing a hand-written PR or issue link (remove it; the PR link is attached automatically at release time):**"$'\n\n'"${linked_fragments}"$'\n'
            fi
            if [ -n "$handwritten_changelogs" ]; then
              comment_body="${comment_body}⚠️ **Direct \`CHANGELOG.md\` edits are not allowed in regular PRs:**"$'\n\n'"${handwritten_changelogs}"$'\n'
            fi
            comment_body="${comment_body}${fragment_help}"
          else
            comment_body="✅ All required changelog fragments are present."
          fi

          write_multiline_output() {
            local name="$1"
            local value="$2"
            local delimiter

            while true; do
              delimiter="EOF_$(openssl rand -hex 16)"
              if ! grep -qxF "$delimiter" <<< "$value"; then
                break
              fi
            done

            {
              echo "${name}<<${delimiter}"
              if [ -n "$value" ]; then
                printf '%s\n' "$value"
              fi
              echo "${delimiter}"
            } >> "$GITHUB_OUTPUT"
          }

          write_multiline_output "missing_fragments" "$missing_fragments"
          write_multiline_output "invalid_fragments" "$invalid_fragments"
          write_multiline_output "linked_fragments" "$linked_fragments"
          write_multiline_output "handwritten_changelogs" "$handwritten_changelogs"
          write_multiline_output "comment_body" "$comment_body"
        env:
          STEPS_CHANGED_FILES_OUTPUTS_ANY_CHANGED: ${{ steps.changed-files.outputs.any_changed }}
          STEPS_CHANGED_FILES_OUTPUTS_ALL_CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
          STEPS_CHANGED_FILES_OUTPUTS_ADDED_FILES: ${{ steps.changed-files.outputs.added_files }}
          STEPS_CHANGED_FILES_OUTPUTS_MODIFIED_FILES: ${{ steps.changed-files.outputs.modified_files }}
          STEPS_CHANGED_FILES_OUTPUTS_RENAMED_FILES: ${{ steps.changed-files.outputs.renamed_files }}
          HEAD_REF: ${{ github.event.pull_request.head.ref }}

      - name: Find existing changelog comment
        if: github.event.pull_request.head.repo.full_name == github.repository
        id: find-comment
        uses: peter-evans/find-comment@b30e6a3c0ed37e7c023ccd3f1db5c6c0b0c23aad # v4.0.0
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: '<!-- changelog-check -->'

      - name: Update PR comment with changelog status
        if: github.event.pull_request.head.repo.full_name == github.repository
        uses: peter-evans/create-or-update-comment@e8674b075228eee787fea43ef493e45ece1004c9 # v5.0.0
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          edit-mode: replace
          body: |
            <!-- changelog-check -->
            ${{ steps.check-folders.outputs.comment_body }}

      - name: Fail if changelog fragment is missing or invalid
        if: steps.check-folders.outputs.missing_fragments != '' || steps.check-folders.outputs.invalid_fragments != '' || steps.check-folders.outputs.linked_fragments != '' || steps.check-folders.outputs.handwritten_changelogs != ''
        run: |
          echo "::error::Missing, invalid, or disallowed changelog updates"
          exit 1