name: Close invalid publish PRs

# Stage 2 of 2 (see detect-invalid-publish-prs.yml for stage 1).
#
# Runs in the trusted base-repo context (triggered by workflow_run, not by the
# PR itself), so it has a write token. It picks up the PR number flagged by
# stage 1 and, after independently re-validating the PR from the API, posts a
# comment pointing at the publishing docs, labels it `invalid`, and closes it.
#
# Trust boundary: the ONLY thing crossing from the untrusted stage is the PR
# number (sanitized to digits below). We re-derive every decision (state,
# author, changed files) here, so a wrong/stale artifact can never cause us to
# close a PR that doesn't actually match.

on:
  workflow_run:
    workflows: ["Detect invalid publish PRs"]
    types: [completed]

permissions:
  contents: read
  pull-requests: write
  issues: write # labels on PRs go through the issues API
  actions: read # needed to list/download the stage-1 artifact

jobs:
  close:
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ github.token }}
      GH_REPO: ${{ github.repository }}
      RUN_ID: ${{ github.event.workflow_run.id }}
      COMMENT_BODY: |
        Hi @__AUTHOR__ 👋 — thanks for your interest in the MCP Registry!

        It looks like this PR is trying to publish an MCP server by adding or editing files in this repository (under `servers/` or in `data/seed.json`). That isn't how servers get published, so I'm closing this PR automatically.

        **Servers are published with the [`mcp-publisher`](https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx) CLI**, not by opening a pull request against this repo. The CLI verifies that you own your namespace and submits your `server.json` directly to the live registry API.

        To publish your server, follow the **[Publishing Quickstart](https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx)**. In short:

        ```bash
        # Build the publisher CLI
        make publisher

        # Authenticate (e.g. via GitHub) and publish your server.json
        ./bin/mcp-publisher login github
        ./bin/mcp-publisher publish
        ```

        Note: `data/seed.json` is seed data for **local development only** — adding entries there does not publish anything to the registry.

        If you believe this was closed in error, please leave a comment and a maintainer will take a look. 🙇

        _This is an automated message._

    steps:
      - name: Check for flagged-pr artifact
        id: check
        run: |
          set -euo pipefail
          names="$(gh api "repos/$GH_REPO/actions/runs/$RUN_ID/artifacts" --jq '.artifacts[].name' || true)"
          if printf '%s\n' "$names" | grep -qx "flagged-pr"; then
            echo "found=true" >> "$GITHUB_OUTPUT"
          else
            echo "No flagged-pr artifact on run $RUN_ID; nothing to do."
            echo "found=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Download flagged PR number
        if: steps.check.outputs.found == 'true'
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          name: flagged-pr
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ github.token }}

      - name: Re-validate and close
        if: steps.check.outputs.found == 'true'
        run: |
          set -euo pipefail

          # Sanitize: the only cross-boundary input. Keep digits only.
          PR_NUMBER="$(tr -dc '0-9' < pr-number.txt)"
          if [ -z "$PR_NUMBER" ]; then
            echo "No valid PR number in artifact; skipping."
            exit 0
          fi
          echo "Re-validating PR #$PR_NUMBER"

          state="$(gh pr view "$PR_NUMBER" --json state --jq '.state')"
          if [ "$state" != "OPEN" ]; then
            echo "PR #$PR_NUMBER is $state, not OPEN; skipping."
            exit 0
          fi

          # Use the REST endpoint: `gh pr view --json` does not expose an
          # authorAssociation field, so calling it there exits non-zero and,
          # under `set -euo pipefail`, aborts the job before we ever close.
          assoc="$(gh api "repos/$GH_REPO/pulls/$PR_NUMBER" --jq '.author_association')"
          case "$assoc" in
            MEMBER|OWNER|COLLABORATOR)
              echo "Author association '$assoc' is trusted; skipping."
              exit 0
              ;;
          esac

          # Idempotency: if a maintainer reopens after we labeled it, leave it be.
          # Capture into a var first so a transient gh failure can't fail open
          # (an errored fetch piped to grep would otherwise look "not labeled").
          labels="$(gh pr view "$PR_NUMBER" --json labels --jq '.labels[].name' || true)"
          if printf '%s\n' "$labels" | grep -qx "invalid"; then
            echo "PR #$PR_NUMBER already labeled 'invalid'; skipping."
            exit 0
          fi

          # Paginated REST endpoint (gh pr view --json files caps at 100, no pagination).
          mapfile -t FILES < <(gh api --paginate "repos/$GH_REPO/pulls/$PR_NUMBER/files" --jq '.[].filename')
          if [ "${#FILES[@]}" -eq 0 ]; then
            echo "No files for PR #$PR_NUMBER; skipping."
            exit 0
          fi
          publish_attempt=0
          other=0
          for f in "${FILES[@]}"; do
            if [[ "$f" == servers/* || "$f" == "data/seed.json" ]]; then
              publish_attempt=1
            else
              other=1
            fi
          done
          if [ "$publish_attempt" -ne 1 ] || [ "$other" -ne 0 ]; then
            echo "PR #$PR_NUMBER no longer matches the publish-attempt pattern; skipping."
            exit 0
          fi

          author="$(gh pr view "$PR_NUMBER" --json author --jq '.author.login')"
          body="${COMMENT_BODY//__AUTHOR__/$author}"

          echo "Commenting on, labeling, and closing PR #$PR_NUMBER"
          gh pr comment "$PR_NUMBER" --body "$body"
          gh pr edit "$PR_NUMBER" --add-label "invalid" || echo "Could not add label; continuing."
          gh pr close "$PR_NUMBER"