name: Publish MCP bridges to npm

# Publishes the two stdio-to-HTTP MCP bridges, packages/accounted-mcp and
# packages/gnubok-mcp, to the public npm registry.
#
# The trigger is a version bump, not a git tag: a push to main that touches a
# packages/*/package.json runs one job per package, and each job publishes only
# if the version in its package.json is not already on the registry. A package
# whose version did not change is skipped, so a merge that bumps one bridge
# never republishes the other, and re-running a finished workflow is a no-op.
#
# Auth is the repository secret NPM_TOKEN, an npm granular access token with
# publish rights on both packages. A run without the secret fails at its first
# step with a message naming it, rather than inside `npm publish` with an opaque
# ENEEDAUTH. A token rather than OIDC trusted publishing because accounted-mcp
# has never been published, and npm cannot bind a trusted publisher to a package
# that does not exist yet.
#
# --provenance attaches a Sigstore attestation that ties the tarball to this
# workflow run and commit; id-token: write exists for that. The registry rejects
# the attestation unless package.json `repository.url` matches this repository,
# which is why both package.jsons point at erp-mafia/accounted.
#
# workflow_dispatch runs the same job on demand, optionally for one package (the
# other package's job is skipped by the Select step), and with dry_run to
# exercise the version gate and `npm publish --dry-run` without touching the
# registry. Dispatching from a branch is the way to test this file
# before merging it.

on:
  push:
    branches: [main]
    paths:
      - 'packages/*/package.json'
  workflow_dispatch:
    inputs:
      package:
        description: Package to publish
        type: choice
        options: [all, accounted-mcp, gnubok-mcp]
        default: all
      dry_run:
        description: Pack and validate only, do not publish
        type: boolean
        default: false

permissions:
  contents: read

# A dispatch overlapping a push could race to publish the same version; the
# loser would only fail with a confusing E403. Queue instead of cancelling.
concurrency:
  group: npm-publish
  cancel-in-progress: false

jobs:
  publish:
    name: Publish ${{ matrix.package }}
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
      # OIDC token for the --provenance attestation.
      id-token: write
    strategy:
      # The packages are independent: a failure in one must not cancel the other.
      fail-fast: false
      matrix:
        # Static on purpose: both packages always get a job. On push the
        # version gate skips the one that did not change; on dispatch the
        # Select step skips the one that was not requested. A matrix built
        # from the dispatch input would put workflow input text into an
        # expression, which is the shape injection scanners flag.
        package: [accounted-mcp, gnubok-mcp]
    env:
      DRY_RUN: ${{ inputs.dry_run == true }}
      PACKAGE_DIR: packages/${{ matrix.package }}

    steps:
      - name: Select package
        id: select
        env:
          REQUESTED: ${{ github.event_name == 'push' && 'all' || inputs.package }}
          PACKAGE: ${{ matrix.package }}
        run: |
          set -euo pipefail
          if [ "$REQUESTED" = "all" ] || [ "$REQUESTED" = "$PACKAGE" ]; then
            echo "run=true" >> "$GITHUB_OUTPUT"
          else
            echo "Skipping $PACKAGE: dispatch requested $REQUESTED."
            echo "run=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Require the NPM_TOKEN secret
        # Before checkout, so a missing secret is the first line of the log.
        # Only the presence of the secret is checked here; the token itself is
        # exposed to the publish step alone.
        if: steps.select.outputs.run == 'true'
        env:
          NPM_TOKEN_SET: ${{ secrets.NPM_TOKEN != '' }}
        run: |
          set -euo pipefail
          if [ "$DRY_RUN" = "true" ]; then
            echo "Dry run: NPM_TOKEN is not required."
            exit 0
          fi
          if [ "$NPM_TOKEN_SET" != "true" ]; then
            echo "::error::Repository secret NPM_TOKEN is not set. Create an npm granular access token with read and write access to accounted-mcp and gnubok-mcp (see the Releasing section in packages/*/README.md) and add it under Settings > Secrets and variables > Actions as NPM_TOKEN."
            exit 1
          fi
          echo "NPM_TOKEN is set."

      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        if: steps.select.outputs.run == 'true'
        with:
          # Nothing here pushes over git; the only credential this job needs is
          # the npm token, and that never touches the checkout.
          persist-credentials: false

      - uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6
        if: steps.select.outputs.run == 'true'
        with:
          node-version: 22
          # Writes an .npmrc that reads the auth token from NODE_AUTH_TOKEN.
          registry-url: https://registry.npmjs.org

      - name: Compare package.json version with the registry
        id: gate
        if: steps.select.outputs.run == 'true'
        working-directory: ${{ env.PACKAGE_DIR }}
        run: |
          set -euo pipefail
          NAME=$(node -p "require('./package.json').name")
          VERSION=$(node -p "require('./package.json').version")

          # `npm view` exits 1 with an E404 body when the package has never
          # been published. That is the first-release case and counts as
          # "nothing on the registry". Any other failure (network, registry
          # outage, bad token) is an error: assuming "not published" there
          # would only move the failure into `npm publish`.
          set +e
          VIEW=$(npm view "$NAME" versions --json 2>&1)
          STATUS=$?
          set -e
          if [ "$STATUS" -ne 0 ]; then
            if grep -q 'E404' <<< "$VIEW"; then
              echo "$NAME has never been published (E404): $VERSION would be its first release."
              VIEW='[]'
            else
              echo "::error::npm view $NAME failed (exit $STATUS)."
              echo "$VIEW"
              exit 1
            fi
          fi

          # `npm view <name> versions --json` prints a bare string, not a
          # one-element array, when exactly one version exists.
          ON_REGISTRY=$(VIEW="$VIEW" VERSION="$VERSION" node -e '
            const raw = JSON.parse(process.env.VIEW);
            const list = Array.isArray(raw) ? raw : [raw];
            console.error("Versions on registry: " + (list.length ? list.join(", ") : "(none)"));
            process.stdout.write(list.includes(process.env.VERSION) ? "yes" : "no");
          ')

          if [ "$ON_REGISTRY" = "yes" ]; then
            echo "Skipping: $NAME@$VERSION is already on the registry."
            echo "publish=false" >> "$GITHUB_OUTPUT"
            echo "- \`$NAME@$VERSION\`: already on the registry, skipped" >> "$GITHUB_STEP_SUMMARY"
          else
            echo "Publishing: $NAME@$VERSION is not on the registry."
            echo "publish=true" >> "$GITHUB_OUTPUT"
          fi
          echo "name=$NAME" >> "$GITHUB_OUTPUT"
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Publish to npm
        if: steps.select.outputs.run == 'true' && steps.gate.outputs.publish == 'true'
        working-directory: ${{ env.PACKAGE_DIR }}
        env:
          # The only step that sees the token.
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
          NAME: ${{ steps.gate.outputs.name }}
          VERSION: ${{ steps.gate.outputs.version }}
        run: |
          set -euo pipefail
          if [ "$DRY_RUN" = "true" ]; then
            # --dry-run packs and validates but never contacts the registry, so
            # it also runs without a token.
            npm publish --dry-run --access public
            echo "- \`$NAME@$VERSION\`: dry run, not published" >> "$GITHUB_STEP_SUMMARY"
            exit 0
          fi
          npm publish --provenance --access public
          echo "- \`$NAME@$VERSION\`: published, https://www.npmjs.com/package/$NAME/v/$VERSION" >> "$GITHUB_STEP_SUMMARY"